{"id":19426,"date":"2019-10-31T15:37:23","date_gmt":"2019-10-31T19:37:23","guid":{"rendered":"https:\/\/www.reivax.com\/us\/?page_id=19426"},"modified":"2023-04-09T17:58:00","modified_gmt":"2023-04-09T21:58:00","slug":"what-is-an-excitation-system","status":"publish","type":"page","link":"https:\/\/www.reivax.com\/us\/excitation-system\/what-is-an-excitation-system\/","title":{"rendered":"What is an Excitation System?"},"content":{"rendered":"<section class=\"wpb-content-wrapper\"><p>[vc_row bg_type=&#8221;image&#8221; bg_image=&#8221;16435&#8243; padding_top_multiplier=&#8221;&#8221; padding_bottom_multiplier=&#8221;&#8221;][vc_column width=&#8221;1\/2&#8243; el_class=&#8221;active&#8221;]<div class=\"grve-empty-space grve-height-3x\" style=\"\"><\/div><h2 class=\"grve-element grve-title grve-align-left grve-animated-item grve-duration-normal grve-fade-in-up grve-h1 grve-increase-heading grve-heading-140\" style=\"margin-bottom: 0px;\" data-delay=\"200\"><span><\/span><\/h2><h2 class=\"grve-element grve-title grve-align-left grve-animated-item grve-duration-normal grve-fade-in-up grve-h1 grve-increase-heading grve-heading-140\" style=\"margin-bottom: 0px;\" data-delay=\"400\"><span>What is an Excitation System?<\/span><\/h2><div class=\"grve-empty-space grve-height-1x\" style=\"\"><\/div><blockquote class=\"grve-element grve-animated-item grve-fade-in-up grve-duration-normal grve-align-left\" style=\"\" data-delay=\"800\"><p>Excitation systems are fundamental to the operation of modern synchronous machines. In this article, we introduce the basic concepts in layman&#8217;s terms.<\/p><\/blockquote><div class=\"grve-element grve-divider\" style=\"\"><div class=\"grve-line-divider grve-border\"><\/div><\/div><div class=\"grve-empty-space grve-height-1x\" style=\"\"><\/div><div class=\"grve-element grve-slogan grve-align-left\" style=\"\"><div class=\"grve-btn-wrapper\"><a href=\"#grve-sidearea\" class=\"grve-btn grve-btn-medium grve-btn-underline grve-text-primary-2 grve-text-hover-primary-2 schedule-btn grve-toggle-hiddenarea\"><span><i class=\"fa fa-comment-o\"><\/i>CONTACT AN EXPERT<span class=\"grve-btn-bottom-line grve-bg-primary-2\"><\/span><\/span><\/a><a href=\"https:\/\/www.reivax.com\/us\/free-excitation-system-specification\/\" title=\"Free Excitation System Specification\" class=\"grve-btn grve-btn-medium grve-btn-underline grve-text-primary-2 grve-text-hover-primary-2\"><span><i class=\"fa fa-book\"><\/i>FREE EXCITATION SYSTEM SPECIFICATION<span class=\"grve-btn-bottom-line grve-bg-primary-2\"><\/span><\/span><\/a><\/div><\/div>[\/vc_column][vc_column width=&#8221;1\/2&#8243; text_align=&#8221;center&#8221;]<div class=\"grve-empty-space grve-height-2x\" style=\"\"><\/div><div class=\"grve-element grve-image grve-animated-item grve-duration-normal grve-fade-in-left grve-align-center grve-full-image grve-image-space-100\" style=\"\" data-delay=\"200\">  <div class=\"grve-image-wrapper\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"640\" src=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/06\/Excitation-System_Main-Picture.png\" class=\"attachment-full size-full\" alt=\"Excitation System\" srcset=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/06\/Excitation-System_Main-Picture.png 800w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/06\/Excitation-System_Main-Picture-300x240.png 300w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/06\/Excitation-System_Main-Picture-768x614.png 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/>   <\/div><\/div>[\/vc_column][\/vc_row][vc_row][vc_column]<div class=\"grve-element grve-divider\" style=\"\"><div class=\"grve-line-divider grve-border\"><\/div><\/div>[\/vc_column][\/vc_row][vc_row padding_top_multiplier=&#8221;&#8221; el_wrapper_class=&#8221;hide_default_tabs&#8221;][vc_column][vc_row_inner css=&#8221;.vc_custom_1554507013708{margin-bottom: 30px !important;}&#8221;][vc_column_inner]<h2 class=\"grve-element grve-title grve-align-left grve-h2\" style=\"\"><span><br>\n<h2 style=\"text-align: left;\">WHAT IS AN EXCITATION SYSTEM?<\/h2>\n<span class=\"grve-title-line grve-bg-primary-1\" style=\"width: 50px;height: 2px;\"><\/span><\/span><\/h2><div class=\"grve-empty-space grve-height-1x\" style=\"\"><\/div>[vc_column_text]<\/p>\n<h3><span style=\"color: #a9242d;\">INTRODUCTION<\/span><\/h3>\n<h4><strong>1. BASIC FUNCTION<br \/>\n<\/strong><\/h4>\n<div class=\"elementor-element elementor-element-6f7ba101 elementor-widget elementor-widget-text-editor\" data-id=\"6f7ba101\" data-element_type=\"text-editor.default\">\n<div class=\"elementor-widget-container\">\n<div class=\"elementor-text-editor elementor-clearfix\">\n<p>The basic function of an excitation system is to provide a continuous (DC) current to the field winding of a synchronous machine. This is achieved through the use of closed-loop control (or feedback control). Modern excitation systems also include diagnostics functions to simplify troubleshooting, communication protocols for SCADA integration, and limiter \/ protection functions to ensure that the synchronous machine is operated within its capability curve.<\/p>\n<h4><strong>2. OBJECTIVE<\/strong><\/h4>\n<p>The objective of an excitation system depends on the application:<\/p>\n<ul class=\"bolinha\">\n<li>For synchronous generators, it is responsible for maintaining a <strong>constant terminal voltage<\/strong>.<\/li>\n<li>For synchronous motors, it is responsible for maintaining a <strong>constant power factor<\/strong>.<\/li>\n<\/ul>\n<h4><strong>3. WORKING PRINCIPLE<br \/>\n<\/strong><\/h4>\n<p>The synchronous machine, which consists of a rotor and stator, produces AC currents using the principle of electromagnetic induction. The DC current passing through the field winding of the rotor produces a static magnetic field. As the rotor is rotated by the prime mover (such as a hydro or steam turbine), the magnetic field is also rotated. Since the rotor is contained within the stator, the rotating magnetic field creates a varying magnetic flux as it intersects the stator windings. This varying magnetic flux induces AC currents in the stator windings of the synchronous machine. An excitation system is necessary since, without excitation current, the machine operates without field current and consequently, no voltage is generated (induced) in the stator windings of the machine.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>[\/vc_column_text]<div class=\"grve-empty-space grve-height-1x\" style=\"\"><\/div>[vc_column_text]<\/p>\n<h3><span style=\"color: #993300;\">EXCITATION SYSTEM CONCEPTS<\/span><\/h3>\n<h4><strong>1. CLOSED LOOP CONTROL<br \/>\n<\/strong><\/h4>\n<div class=\"elementor-element elementor-element-6f7ba101 elementor-widget elementor-widget-text-editor\" data-id=\"6f7ba101\" data-element_type=\"text-editor.default\">\n<div class=\"elementor-widget-container\">\n<div class=\"elementor-text-editor elementor-clearfix\">\n<p>Excitation systems use closed-loop or feedback control to regulate the machine\u2019s output. In closed-loop control, the machine output is routed back to the controller and compared to a setpoint, and the error between the setpoint and output is used to compute the system response. The controller is typically modeled as a PID, PI or lead-lag controller.<\/p>\n<p>The Reivax control loop is compatible with the <strong>ST4C<\/strong> model defined in IEEE 421.5. A simplified version of this control loop is shown on the Reivax HMI screen:<\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>[\/vc_column_text]<div class=\"grve-empty-space grve-height-1x\" style=\"\"><\/div><div class=\"grve-element grve-image grve-align-center\" style=\"\">  <div class=\"grve-image-wrapper\"><img loading=\"lazy\" decoding=\"async\" width=\"897\" height=\"313\" src=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_transfer-function.png\" class=\"attachment-full size-full\" alt=\"Closed Loop Control\" srcset=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_transfer-function.png 897w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_transfer-function-300x105.png 300w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_transfer-function-768x268.png 768w\" sizes=\"auto, (max-width: 897px) 100vw, 897px\" \/>   <\/div><\/div><div class=\"grve-empty-space grve-height-2x\" style=\"\"><\/div>[vc_column_text]The tuning parameters associated with the control loop can easily be modified directly from the HMI.\u00a0 Three (3) sets of tuning parameters, allows for tailoring the optimal response for when a generator is not connected to the grid and for grid-connected mode depending if the Power System Stabilizer (PSS) is active or not :[\/vc_column_text]<div class=\"grve-empty-space grve-height-1x\" style=\"\"><\/div><div class=\"grve-element grve-image grve-align-center\" style=\"\">  <div class=\"grve-image-wrapper\"><img loading=\"lazy\" decoding=\"async\" width=\"646\" height=\"340\" src=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_transfer-function-parameters.png\" class=\"attachment-full size-full\" alt=\"transfer function parameters\" srcset=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_transfer-function-parameters.png 646w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_transfer-function-parameters-300x158.png 300w\" sizes=\"auto, (max-width: 646px) 100vw, 646px\" \/>   <\/div><\/div><div class=\"grve-empty-space grve-height-2x\" style=\"\"><\/div>[vc_column_text]A sample diagram of the full control loop is shown below:[\/vc_column_text]<div class=\"grve-empty-space grve-height-1x\" style=\"\"><\/div><div class=\"grve-element grve-image grve-align-center\" style=\"\">  <div class=\"grve-image-wrapper\"><img loading=\"lazy\" decoding=\"async\" width=\"972\" height=\"616\" src=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/Diagram-Full-Control-Loop.png\" class=\"attachment-full size-full\" alt=\"Diagram Full Control Loop\" srcset=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/Diagram-Full-Control-Loop.png 972w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/Diagram-Full-Control-Loop-300x190.png 300w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/Diagram-Full-Control-Loop-768x487.png 768w\" sizes=\"auto, (max-width: 972px) 100vw, 972px\" \/>   <\/div><\/div><div class=\"grve-empty-space grve-height-2x\" style=\"\"><\/div>[vc_column_text]<\/p>\n<h4><strong>2. LIMITERS AND PROTECTIONS<br \/>\n<\/strong><\/h4>\n<p>Modern excitation systems are responsible for protecting the synchronous machine, the excitation system itself, and other devices. Limiters (OEL, UEL, VHz, SCL) and protections (24, 27, 32, 37F, 40\/32Q, 50\/51, 59, 59F, 76F, 81O\/U) are software features designed to limit the machine operation in undesirable conditions, and are implemented as add-ons to the AVR control loop. Limiters will ensure that the machine is operated within the machines capability at all times, while the protection functions will protect the machine by initiating a trip. The excitation protective functions are typically duplicated in a separate unit protection relay.\u00a0 It is possible to disable the excitation protective functions and only rely on the unit protective relay or both protective functions can be utilized, in which case there needs to be a coordination between the two protective functions.<\/p>\n<p>The most common limiters and their functions are given below:[\/vc_column_text]<div class=\"grve-empty-space grve-height-1x\" style=\"\"><\/div><div class=\"grve-element grve-image grve-align-center\" style=\"\">  <div class=\"grve-image-wrapper\"><img loading=\"lazy\" decoding=\"async\" width=\"639\" height=\"659\" src=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/Table2.jpg\" class=\"attachment-full size-full\" alt=\"Table Limiters and Protections\" srcset=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/Table2.jpg 639w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/Table2-291x300.jpg 291w\" sizes=\"auto, (max-width: 639px) 100vw, 639px\" \/>   <\/div><\/div><div class=\"grve-empty-space grve-height-2x\" style=\"\"><\/div>[vc_column_text]<\/p>\n<h5><strong><span style=\"color: #000080;\">2.1. OVER EXCITATION LIMITER (OEL)<\/span><br \/>\n<\/strong><\/h5>\n<p>For excitation systems manufactured by Reivax, limiters can easily be configured from the HMI. The simplified transfer function and configuration screen for the OEL is shown below corresponds to IEEE 421.5 OEL2C. The OEL is configured as an inverse-time characteristic curve as per IEEE\/ANSI C50.13.[\/vc_column_text]<div class=\"grve-empty-space grve-height-1x\" style=\"\"><\/div><div class=\"grve-element grve-image grve-align-center\" style=\"\">  <div class=\"grve-image-wrapper\"><img loading=\"lazy\" decoding=\"async\" width=\"893\" height=\"301\" src=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_OEL_tf.png\" class=\"attachment-full size-full\" alt=\"Over Excitation Limiter (OEL)\" srcset=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_OEL_tf.png 893w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_OEL_tf-300x101.png 300w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_OEL_tf-768x259.png 768w\" sizes=\"auto, (max-width: 893px) 100vw, 893px\" \/>   <\/div><\/div><div class=\"grve-empty-space grve-height-2x\" style=\"\"><\/div>[vc_column_text]<\/p>\n<div class=\"elementor-element elementor-element-6f7ba101 elementor-widget elementor-widget-text-editor\" data-id=\"6f7ba101\" data-element_type=\"text-editor.default\">\n<div class=\"elementor-widget-container\">\n<div class=\"elementor-text-editor elementor-clearfix\">\n<div class=\"elementor-element elementor-element-6f7ba101 elementor-widget elementor-widget-text-editor\" data-id=\"6f7ba101\" data-element_type=\"text-editor.default\">\n<div class=\"elementor-widget-container\">\n<div class=\"elementor-text-editor elementor-clearfix\">\n<h5><span style=\"color: #000080;\"><strong>2.2. UNDER EXCITATION LIMITER (UEL)<\/strong><\/span><\/h5>\n<p>The simplified transfer function and configuration screen for the UEL is shown below. The UEL is configured as a piece-wise linear characteristic in the underexcited region (negative reactive power) of the capability curve as per IEEE 421.5 UEL2C.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>[\/vc_column_text]<div class=\"grve-empty-space grve-height-1x\" style=\"\"><\/div><div class=\"grve-element grve-image grve-align-center\" style=\"\">  <div class=\"grve-image-wrapper\"><img loading=\"lazy\" decoding=\"async\" width=\"895\" height=\"304\" src=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_UEL_tf.png\" class=\"attachment-full size-full\" alt=\"Under Excitation Limiter (UEL)\" srcset=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_UEL_tf.png 895w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_UEL_tf-300x102.png 300w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_UEL_tf-768x261.png 768w\" sizes=\"auto, (max-width: 895px) 100vw, 895px\" \/>   <\/div><\/div><div class=\"grve-empty-space grve-height-2x\" style=\"\"><\/div><div class=\"grve-element grve-image grve-align-center\" style=\"\">  <div class=\"grve-image-wrapper\"><img loading=\"lazy\" decoding=\"async\" width=\"984\" height=\"504\" src=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_UEL_conf.png\" class=\"attachment-full size-full\" alt=\"UEL Capability Curve\" srcset=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_UEL_conf.png 984w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_UEL_conf-300x154.png 300w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_UEL_conf-768x393.png 768w\" sizes=\"auto, (max-width: 984px) 100vw, 984px\" \/>   <\/div><\/div><div class=\"grve-empty-space grve-height-2x\" style=\"\"><\/div>[vc_column_text]<\/p>\n<h4><strong>3. PROTECTION COORDINATION<br \/>\n<\/strong><\/h4>\n<p>Coordination between limiters, equipment limits and external protection relays is an important aspect of proper excitation system integration. Typically, coordination is performed as part of a protection study or model validation study, with the settings tested during commissioning of the equipment.<\/p>\n<p>During commissioning, the OEL is drawn such that it overlaps the IEEE\/ANSI C50.13 rotor thermal limit.<\/p>\n<h4><strong>4. CAPABILITY CURVE<br \/>\n<\/strong><\/h4>\n<p>The capability curve of a synchronous machine is a graphical representation of the operating limits of the machine. The capability curve is a plot of the machine active power (MW) versus the reactive power (MVar). Typically, the following physical operating limits are represented:<\/p>\n<ul class=\"bolinha\">\n<li>Rotor thermal limit<\/li>\n<li>Turbine limit<\/li>\n<li>Practical stability limit<\/li>\n<li>Pole slip limit<\/li>\n<\/ul>\n<p>In addition, the following limiters are typically represented:<\/p>\n<ul class=\"bolinha\">\n<li>Over Excitation Limiter (OEL)<\/li>\n<li>Under Excitation Limiter (UEL)<\/li>\n<\/ul>\n<p>Excitation systems manufactured by Reivax include a dynamic capability curve that can be used to monitor operating conditions in real-time. An example of such a capability curve is shown below.[\/vc_column_text]<div class=\"grve-empty-space grve-height-1x\" style=\"\"><\/div><div class=\"grve-element grve-image grve-align-center\" style=\"\">  <div class=\"grve-image-wrapper\"><img loading=\"lazy\" decoding=\"async\" width=\"1022\" height=\"766\" src=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_capability-curve.png\" class=\"attachment-full size-full\" alt=\"Capability Curve\" srcset=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_capability-curve.png 1022w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_capability-curve-300x225.png 300w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_capability-curve-768x576.png 768w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_capability-curve-560x420.png 560w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_capability-curve-900x675.png 900w\" sizes=\"auto, (max-width: 1022px) 100vw, 1022px\" \/>   <\/div><\/div><div class=\"grve-empty-space grve-height-2x\" style=\"\"><\/div>[vc_column_text]The capability curve shows the safe operating region of the machine, indicated in green, restricted by limiters and the physical limits of the machine. It also shows the operating point of the machine, in terms of active and reactive power (both quantities are shown in pu).<\/p>\n<h4><strong>5. POWER SYTEM STABILIZER (PSS)<br \/>\n<\/strong><\/h4>\n<p>The Power System Stabilizer (PSS) is an add-on to the control loop of an excitation system that improves system stability by compensating for low frequency (0-5Hz) oscillations in the power system. This translates into a more stable generator output power, which can lead to significant savings due to reduced power losses. Power System Stabilizers offer superior cost effectiveness and have been found to produce millions of dollars in annual benefits for large utilities.<\/p>\n<p>The PSS output is added to the AVR control loop. The image below shows the PSS summing junction as it appears on the transfer function of a Reivax excitation system.[\/vc_column_text]<div class=\"grve-empty-space grve-height-1x\" style=\"\"><\/div><div class=\"grve-element grve-image grve-align-center\" style=\"\">  <div class=\"grve-image-wrapper\"><img loading=\"lazy\" decoding=\"async\" width=\"1021\" height=\"363\" src=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/AVR-control-loop_PSS_2.png\" class=\"attachment-full size-full\" alt=\"AVR Control Loop PSS\" srcset=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/AVR-control-loop_PSS_2.png 1021w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/AVR-control-loop_PSS_2-300x107.png 300w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/AVR-control-loop_PSS_2-768x273.png 768w\" sizes=\"auto, (max-width: 1021px) 100vw, 1021px\" \/>   <\/div><\/div><div class=\"grve-empty-space grve-height-2x\" style=\"\"><\/div>[vc_column_text]The graph below shows the response of a 32.5MW utility-scale generator with and without the PSS. A disturbance is introduced at the 2 and 12 second marks. The transient and steady-state stability are noticeably improved. Without the PSS, oscillations continue for about 10 seconds after the disturbance, whereas they are damped almost immediately when the PSS is turned on.[\/vc_column_text]<div class=\"grve-empty-space grve-height-1x\" style=\"\"><\/div><div class=\"grve-element grve-image grve-align-center\" style=\"\">  <div class=\"grve-image-wrapper\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"400\" src=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/Active-Power.png\" class=\"attachment-full size-full\" alt=\"AVR Control Loop PSS\" srcset=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/Active-Power.png 1000w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/Active-Power-300x120.png 300w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/Active-Power-768x307.png 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/>   <\/div><\/div><div class=\"grve-empty-space grve-height-2x\" style=\"\"><\/div>[vc_column_text]The Reivax PSS is compatible with the IEEE <strong>PSS2A<\/strong> and <strong>PSS2B<\/strong> models.[\/vc_column_text]<div class=\"grve-empty-space grve-height-2x\" style=\"\"><\/div>[vc_column_text]<\/p>\n<h3><span style=\"color: #993300;\">TYPES OF EXCITATION SYSTEMS<\/span><\/h3>\n<p>Different types of excitation systems have emerged over the years in the power industry. They are classified into two general categories, depending on the power source, rotating exciters and static exciters.<\/p>\n<h4><strong>1. ROTATING EXCITATION SYSTEMS<\/strong><\/h4>\n<p>In rotating excitation systems, there are two exciters: the main exciter and the pilot exciter. The main exciter supplies the pilot exciter, and the pilot exciter in turn directly supplies the synchronous machine. There are two sub-categories of rotating excitation systems: AC and DC.<\/p>\n<h5><strong><span style=\"color: #000080;\">1.1. AC BRUSHLESS EXCITER<\/span><br \/>\n<\/strong><\/h5>\n<p>In an AC excitation system, the main power rectifier supplies an intermediary AC exciter. This AC exciter contains an internal power rectifier which then supplies the field winding of the synchronous machine.<\/p>\n<p>A single-line diagram of an AC rotating exciter is shown below.[\/vc_column_text]<div class=\"grve-empty-space grve-height-1x\" style=\"\"><\/div><div class=\"grve-element grve-image grve-align-center\" style=\"\">  <div class=\"grve-image-wrapper\"><img loading=\"lazy\" decoding=\"async\" width=\"1379\" height=\"615\" src=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/AC-Excitation-System-Synchronous-Machine.png\" class=\"attachment-full size-full\" alt=\"TYPES OF EXCITATION SYSTEMS Different types of excitation systems have emerged over the years in the power industry. They are classified into two general categories, depending on the power source, rotating exciters and static exciters. 1. ROTATING EXCITATION SYSTEMS In rotating excitation systems, there are two exciters: the main exciter and the pilot exciter. The main exciter supplies the pilot exciter, and the pilot exciter in turn directly supplies the synchronous machine. There are two sub-categories of rotating excitation systems: AC and DC. 1.1. AC BRUSHLESS EXCITER In an AC excitation system, the main power rectifier supplies an intermediary AC exciter. This AC exciter contains an internal power rectifier which then supplies the field winding of the synchronous machine. A single-line diagram of an AC rotating exciter is shown below.\" srcset=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/AC-Excitation-System-Synchronous-Machine.png 1379w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/AC-Excitation-System-Synchronous-Machine-300x134.png 300w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/AC-Excitation-System-Synchronous-Machine-768x343.png 768w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/AC-Excitation-System-Synchronous-Machine-1024x457.png 1024w\" sizes=\"auto, (max-width: 1379px) 100vw, 1379px\" \/>   <\/div><\/div><div class=\"grve-empty-space grve-height-2x\" style=\"\"><\/div>[vc_column_text]<\/p>\n<h5><span style=\"color: #000080;\"><strong>1.2. DC EXCITER<\/strong><\/span><\/h5>\n<p>In a DC excitation system, the power rectifier supplies an intermediary DC exciter, which in turn supplies the field winding of the synchronous machine.<\/p>\n<p>A single-line diagram of a DC rotating exciter is shown below.[\/vc_column_text]<div class=\"grve-empty-space grve-height-1x\" style=\"\"><\/div><div class=\"grve-element grve-image grve-align-center\" style=\"\">  <div class=\"grve-image-wrapper\"><img loading=\"lazy\" decoding=\"async\" width=\"1112\" height=\"730\" src=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/DC-Excitation-System.png\" class=\"attachment-full size-full\" alt=\"DC Excitation System\" srcset=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/DC-Excitation-System.png 1112w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/DC-Excitation-System-300x197.png 300w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/DC-Excitation-System-768x504.png 768w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/DC-Excitation-System-1024x672.png 1024w\" sizes=\"auto, (max-width: 1112px) 100vw, 1112px\" \/>   <\/div><\/div><div class=\"grve-empty-space grve-height-2x\" style=\"\"><\/div>[vc_column_text]<\/p>\n<h4><strong>2. STATIC EXCITATION SYSTEMS &#8211; TERMINAL-FED<br \/>\n<\/strong><\/h4>\n<p>In static excitation systems, the power rectifier directly supplies the field winding of the synchronous machine. There is no pilot exciter.<\/p>\n<p>A static excitation system is <strong>terminal-fed<\/strong> (also called bus-fed) when the supply is taken from the machine itself through a power potential transformer (PPT). The primary of the PPT is connected to the stator of the machine and the secondary supplies power to the rectifier.<\/p>\n<p>Static excitation systems are not inherently self-exciting, so they require an external supply to jump-start the excitation process and build up sufficient magnetic flux. This process is called <strong>field flashing<\/strong>.[\/vc_column_text]<div class=\"grve-empty-space grve-height-1x\" style=\"\"><\/div><div class=\"grve-element grve-image grve-align-center\" style=\"\">  <div class=\"grve-image-wrapper\"><img loading=\"lazy\" decoding=\"async\" width=\"1159\" height=\"720\" src=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/Static-Excitation-System.png\" class=\"attachment-full size-full\" alt=\"Static Excitation System\" srcset=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/Static-Excitation-System.png 1159w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/Static-Excitation-System-300x186.png 300w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/Static-Excitation-System-768x477.png 768w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/Static-Excitation-System-1024x636.png 1024w\" sizes=\"auto, (max-width: 1159px) 100vw, 1159px\" \/>   <\/div><\/div><div class=\"grve-empty-space grve-height-2x\" style=\"\"><\/div>[vc_column_text]<\/p>\n<h5><strong><span style=\"color: #000080;\">2.1. ADVANTAGES OF STATIC EXCITATION SYSTEMS<\/span><br \/>\n<\/strong><\/h5>\n<p>Static excitation systems provide a number of benefits that make them an attractive option for synchronous machine control:<\/p>\n<ul class=\"bolinha\">\n<li>Simple, reliable and cost-effective design<\/li>\n<li>Minimal maintenance requirements<\/li>\n<li>High performance and fast response characteristics<\/li>\n<\/ul>\n<p>[\/vc_column_text]<div class=\"grve-empty-space grve-height-1x\" style=\"\"><\/div>[vc_column_text]<\/p>\n<h5><strong><span style=\"color: #000080;\">2.2. MAIN COMPONENTS<\/span><br \/>\n<\/strong><\/h5>\n<p>The main components of a static excitation system are listed below:<\/p>\n<h6><span style=\"color: #000000;\">2.2.1. AUTOMATIC VOLTAGE REGULATOR (AVR)<\/span><\/h6>\n<p>The automatic voltage regulator (AVR), commonly known simply as voltage regulator, executes all control functions of the system, including the following:<\/p>\n<ul class=\"bolinha\">\n<li>Operating breakers<\/li>\n<li>Sending firing pulses to bridges<\/li>\n<li>Responding to operator commands or grid disturbances<\/li>\n<li>Monitoring system I\/Os and taking appropriate actions in response to them<\/li>\n<li>Maintaining the excitation system within safety and stability limits through the use of limiters and protections<\/li>\n<li>Issuing notifications to the plant SCADA system if anomalous conditions occur<\/li>\n<li>Tripping the excitation system if a critical failure or dangerous condition occurs<\/li>\n<\/ul>\n<p>The main elements of an AVR are as follows:<\/p>\n<ul class=\"bolinha\">\n<li>Control loop<\/li>\n<li>Limiters<\/li>\n<li>Power system stabilizer<\/li>\n<\/ul>\n<p>Redundant control solutions are common. In a redundant configuration, there are two voltage regulators, one that executes the control functions while the other is in <strong>hot standby<\/strong>.<\/p>\n<h6>2.2.2. POWER RECTIFIER<\/h6>\n<p>Static excitation systems typically use a power rectifier that converts AC to DC current and provides a controlled field current to the synchronous machine. Power rectifiers typically use thyristor or IGBT technology.<\/p>\n<p>Heat generation is a concern for the power rectifier. For bridge cooling, redundant fan sets are typically provided.<\/p>\n<p>Redundant bridge configurations are common. In case multiple bridges are present, the excitation system will perform <strong>current equalization<\/strong> to balance the bridge outputs.<\/p>\n<h6>2.2.3. CONVERTER INTERFACE<\/h6>\n<p>The converter interface consists of all intermediary devices between the controller and power rectifier. It converts the control signal to firing pulses and isolates the control electronics from the power section.<\/p>\n<p>On excitation systems manufactured by Reivax, diagnostics tools for monitoring the power rectifier are provided on the HMI. The status of fans, fuses, and semiconductor temperatures can be checked in real-time, as shown below.[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner][vc_column_inner width=&#8221;1\/2&#8243;]<div class=\"grve-element grve-image grve-align-center\" style=\"\">  <div class=\"grve-image-wrapper\"><img loading=\"lazy\" decoding=\"async\" width=\"793\" height=\"595\" src=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_converter-interface.png\" class=\"attachment-full size-full\" alt=\"Converter Interface\" srcset=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_converter-interface.png 793w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_converter-interface-300x225.png 300w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_converter-interface-768x576.png 768w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17005_converter-interface-560x420.png 560w\" sizes=\"auto, (max-width: 793px) 100vw, 793px\" \/>   <\/div><\/div>[vc_column_text]This screen demonstrates normal bridge operation. All 6 thyristors are conducting normally. Current is equally balanced between the 3 branches. Fan set 1 (A&amp;B) is active, while fan set 2 is on standby.[\/vc_column_text][\/vc_column_inner][vc_column_inner width=&#8221;1\/2&#8243;]<div class=\"grve-element grve-image grve-align-center\" style=\"\">  <div class=\"grve-image-wrapper\"><img loading=\"lazy\" decoding=\"async\" width=\"790\" height=\"598\" src=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17010_converter-interface-with-failures.png\" class=\"attachment-full size-full\" alt=\"Converter Interface with Failures\" srcset=\"https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17010_converter-interface-with-failures.png 790w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17010_converter-interface-with-failures-300x227.png 300w, https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/11\/N17010_converter-interface-with-failures-768x581.png 768w\" sizes=\"auto, (max-width: 790px) 100vw, 790px\" \/>   <\/div><\/div>[vc_column_text]In this screen, the HMI is indicating a problem with fan A. As a result, the exciter has automatically transitioned to fan set 2 (D&amp;E). There is also an indication of a fuse problem with thyristor #5. The measured current through this thyristor has dropped to zero, indicating that there is no conduction.[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner][vc_column_inner]<div class=\"grve-empty-space grve-height-2x\" style=\"\"><\/div>[vc_column_text]<\/p>\n<h6>2.2.4. POWER POTENTIAL TRANSFORMER (PPT)<\/h6>\n<p>The PPT is a 3-phase step-down power transformer used in static excitation systems. Its purpose is to step down incoming AC voltages from the synchronous machine to a level that can be supplied to the power rectifier.<\/p>\n<h6>2.2.5. FIELD BREAKER (AC OR DC)<\/h6>\n<p>The main purpose of the field breaker is to interrupt the excitation and serve as an isolation point for performing maintenance and troubleshooting.<\/p>\n<p>Both AC and DC solutions are common. The field breaker can be installed either directly in the field circuit, or between the secondary of the excitation transformer and the rectifier of the system. In the latter case, the breaker is often called an AC contactor instead.<\/p>\n<h6>2.2.6. DC FIELD FLASHING<\/h6>\n<p>The field flashing circuit is used in the start-up process, when the magnetic flux in the generator is too low. The field of the synchronous machine is temporarily connected in parallel to an external DC supply, such as a station battery, until the synchronous machine develops enough terminal voltage such that the excitation becomes self-sustaining. Afterwards, the field flashing is interrupted.<\/p>\n<h6>2.2.6. CROWBAR AND DISCHARGE CIRCUIT<\/h6>\n<p>The crowbar is a safety feature designed to protect the excitation system and field winding from external surges, generator pole displacement, etc.[\/vc_column_text]<div class=\"grve-empty-space grve-height-2x\" style=\"\"><\/div>[\/vc_column_inner][\/vc_row_inner][vc_row_inner][vc_column_inner]<div class=\"grve-empty-space grve-height-2x\" style=\"\"><\/div><div class=\"grve-element grve-box-icon grve-small grve-side-icon grve-align-left\" style=\"\"><div class=\"grve-wrapper-icon grve-no-shape\" style=\"\"><i class=\"grve-text-primary-2 fa fa-bolt\"><\/i><\/div><div class=\"grve-box-content\">  <p class=\"\">If you would like to discuss these features with a qualified engineer to better understand the advantages, please call our toll free number 1-877-7REIVAX.<\/p><\/div><\/div>[\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row padding_top_multiplier=&#8221;&#8221; padding_bottom_multiplier=&#8221;&#8221;][vc_column]<div 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class=\"grve-post-content-wrapper\">\r\n\t\t\t\t\t\t\t<div class=\"grve-post-content\">\r\n\t\t\t\t\t\t\t\t<div class=\"grve-post-header\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"grve-hidden\">\r\n\t\t\t<span class=\"grve-structured-data entry-title\">Combined exciter and governor upgrade<\/span>\r\n\t\t\t<span class=\"grve-structured-data\" itemprop=\"image\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\">\r\n\t\t\t   <span itemprop='url' >https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2026\/03\/U133-New-RTVX-Power-line-up-scaled.jpeg<\/span>\r\n\t\t\t   <span itemprop='height' >1920<\/span>\r\n\t\t\t   <span itemprop='width' >2560<\/span>\r\n\t\t\t<\/span>\r\n\t\t\t\t\t\t<span class=\"grve-structured-data vcard author\" itemprop=\"author\" itemscope itemtype=\"http:\/\/schema.org\/Person\">\r\n\t\t\t\t<span itemprop=\"name\" class=\"fn\">REIVAX<\/span>\r\n\t\t\t<\/span>\r\n\t\t\t<span class=\"grve-structured-data\" itemprop=\"publisher\" itemscope itemtype=\"http:\/\/schema.org\/Organization\">\r\n\t\t\t\t<span itemprop='name'>REIVAX<\/span>\r\n\t\t\t\t<span itemprop='logo' itemscope itemtype='http:\/\/schema.org\/ImageObject'>\r\n\t\t\t\t\t<span itemprop='url'>\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/01\/Logo-Reivax.png<\/span>\r\n\t\t\t\t<\/span>\r\n\t\t\t<\/span>\r\n\t\t\t\t\t\t<time class=\"grve-structured-data date published\" itemprop=\"datePublished\" datetime=\"2026-03-26T13:09:43-04:00\">March 26, 2026<\/time>\r\n\t\t\t<time class=\"grve-structured-data date updated\" itemprop=\"dateModified\"  datetime=\"2026-03-26T13:12:22-04:00\">March 26, 2026<\/time>\r\n\t\t\t<span class=\"grve-structured-data\" itemprop=\"mainEntityOfPage\" itemscope itemtype=\"http:\/\/schema.org\/WebPage\" itemid=\"https:\/\/www.reivax.com\/us\/combined-exciter-and-governor-upgrade\/\"><\/span>\r\n\t\t<\/span>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<ul class=\"grve-post-meta\">\r\n\t\t\t\t\t\t\t\t\t\t<li class=\"grve-post-date\">\t<time class=\"\" datetime=\"2026-03-26T13:09:43-04:00\">\r\n\t\tMarch 26, 2026\t<\/time>\r\n<\/li>\t\t\t\t\t\t\t\t\t\t<\/ul>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<ul class=\"grve-categories\">\t<li class=\"cat-item cat-item-1598\"><a href=\"https:\/\/www.reivax.com\/us\/category\/cases\/cases-combined-system\/\">Cases &#8211; Combined system<\/a>\n<\/li>\n<\/ul>\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.reivax.com\/us\/combined-exciter-and-governor-upgrade\/\" rel=\"bookmark\"><h2 class=\"grve-post-title grve-post-title-hover grve-h6\" itemprop=\"headline\">Combined exciter and governor upgrade<\/h2><\/a>\t\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t<div itemprop=\"articleBody\"><p>[vc_row][vc_column][vc_column_text] Combined exciter and governor retrofit In 2024, Reivax received an award for replacing an aging Fuji cabinet governor system for three (3) Kaplan units.&hellip;<\/p><a class=\"grve-read-more grve-link-text grve-heading-color grve-text-hover-primary-1\" href=\"https:\/\/www.reivax.com\/us\/combined-exciter-and-governor-upgrade\/\"><span>read more<\/span><\/a><\/div>\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\r\n\t\t\t\t<\/div>\t\t\t<\/article>\r\n\r\n\t\t\t<article class=\"grve-blog-item grve-style-2 grve-isotope-item post-22061 post type-post status-publish format-standard has-post-thumbnail hentry category-cases category-cases-governor tag-woodward-governor-retrofit\" itemscope itemType=\"http:\/\/schema.org\/BlogPosting\">\r\n\t\t\t\t<div class=\"grve-blog-item-inner grve-isotope-item-inner\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"grve-media grve-bg-wrapper\">\r\n\t\t\t\t\t\t<div class=\"grve-bg-image\" style=\"background-image: url(https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2025\/08\/REIVAX-tooth-wheel-and-pick-up-sensors.jpeg);\"><\/div>\r\n\t\t\t\t\t\t\t<div class=\"grve-bg-black grve-bg-overlay grve-opacity-70\"><\/div>\r\n\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t<div class=\"grve-post-content-wrapper\">\r\n\t\t\t\t\t\t\t<div class=\"grve-post-content\">\r\n\t\t\t\t\t\t\t\t<div class=\"grve-post-header\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"grve-hidden\">\r\n\t\t\t<span class=\"grve-structured-data entry-title\">Woodward gate shaft governor &#8211; Life extention upgrade<\/span>\r\n\t\t\t<span class=\"grve-structured-data\" itemprop=\"image\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\">\r\n\t\t\t   <span itemprop='url' >https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2025\/08\/REIVAX-tooth-wheel-and-pick-up-sensors.jpeg<\/span>\r\n\t\t\t   <span itemprop='height' >960<\/span>\r\n\t\t\t   <span itemprop='width' >1280<\/span>\r\n\t\t\t<\/span>\r\n\t\t\t\t\t\t<span class=\"grve-structured-data vcard author\" itemprop=\"author\" itemscope itemtype=\"http:\/\/schema.org\/Person\">\r\n\t\t\t\t<span itemprop=\"name\" class=\"fn\">REIVAX<\/span>\r\n\t\t\t<\/span>\r\n\t\t\t<span class=\"grve-structured-data\" itemprop=\"publisher\" itemscope itemtype=\"http:\/\/schema.org\/Organization\">\r\n\t\t\t\t<span itemprop='name'>REIVAX<\/span>\r\n\t\t\t\t<span itemprop='logo' itemscope itemtype='http:\/\/schema.org\/ImageObject'>\r\n\t\t\t\t\t<span itemprop='url'>\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/01\/Logo-Reivax.png<\/span>\r\n\t\t\t\t<\/span>\r\n\t\t\t<\/span>\r\n\t\t\t\t\t\t<time class=\"grve-structured-data date published\" itemprop=\"datePublished\" datetime=\"2025-08-01T11:50:55-04:00\">August 1, 2025<\/time>\r\n\t\t\t<time class=\"grve-structured-data date updated\" itemprop=\"dateModified\"  datetime=\"2025-09-24T13:35:57-04:00\">September 24, 2025<\/time>\r\n\t\t\t<span class=\"grve-structured-data\" itemprop=\"mainEntityOfPage\" itemscope itemtype=\"http:\/\/schema.org\/WebPage\" itemid=\"https:\/\/www.reivax.com\/us\/life-extension-upgrade-on-a-woodward-gate-shaft-governor\/\"><\/span>\r\n\t\t<\/span>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<ul class=\"grve-post-meta\">\r\n\t\t\t\t\t\t\t\t\t\t<li class=\"grve-post-date\">\t<time class=\"\" datetime=\"2025-08-01T11:50:55-04:00\">\r\n\t\tAugust 1, 2025\t<\/time>\r\n<\/li>\t\t\t\t\t\t\t\t\t\t<\/ul>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<ul class=\"grve-categories\">\t<li class=\"cat-item cat-item-49\"><a href=\"https:\/\/www.reivax.com\/us\/category\/cases\/\">Cases<\/a>\n<\/li>\n\t<li class=\"cat-item cat-item-1599\"><a href=\"https:\/\/www.reivax.com\/us\/category\/cases\/cases-governor\/\">Cases &#8211; Governor<\/a>\n<\/li>\n<\/ul>\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.reivax.com\/us\/life-extension-upgrade-on-a-woodward-gate-shaft-governor\/\" rel=\"bookmark\"><h2 class=\"grve-post-title grve-post-title-hover grve-h6\" itemprop=\"headline\">Woodward gate shaft governor &#8211; Life extention upgrade<\/h2><\/a>\t\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t<div itemprop=\"articleBody\"><p>[vc_row][vc_column][vc_column_text] Woodward gate shaft governor retrofit by REIVAX In 2024, Reivax received an award for replacing digital governors at the Bull Shoals hydro station, as&hellip;<\/p><a class=\"grve-read-more grve-link-text grve-heading-color grve-text-hover-primary-1\" href=\"https:\/\/www.reivax.com\/us\/life-extension-upgrade-on-a-woodward-gate-shaft-governor\/\"><span>read more<\/span><\/a><\/div>\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\r\n\t\t\t\t<\/div>\t\t\t<\/article>\r\n\r\n\t\t\t<article class=\"grve-blog-item grve-style-2 grve-isotope-item post-21957 post type-post status-publish format-standard has-post-thumbnail hentry category-cases category-cases-excitation category-excitation-cases tag-ex2100-upgrade tag-excitation-system\" itemscope itemType=\"http:\/\/schema.org\/BlogPosting\">\r\n\t\t\t\t<div class=\"grve-blog-item-inner grve-isotope-item-inner\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"grve-media grve-bg-wrapper\">\r\n\t\t\t\t\t\t<div class=\"grve-bg-image\" style=\"background-image: url(https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2024\/12\/Mossyrock-3.jpg);\"><\/div>\r\n\t\t\t\t\t\t\t<div class=\"grve-bg-black grve-bg-overlay grve-opacity-70\"><\/div>\r\n\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t<div class=\"grve-post-content-wrapper\">\r\n\t\t\t\t\t\t\t<div class=\"grve-post-content\">\r\n\t\t\t\t\t\t\t\t<div class=\"grve-post-header\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"grve-hidden\">\r\n\t\t\t<span class=\"grve-structured-data entry-title\">Life extension upgrade on a GE EX2100E exciter<\/span>\r\n\t\t\t<span class=\"grve-structured-data\" itemprop=\"image\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\">\r\n\t\t\t   <span itemprop='url' >https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2024\/12\/Mossyrock-3.jpg<\/span>\r\n\t\t\t   <span itemprop='height' >1316<\/span>\r\n\t\t\t   <span itemprop='width' >536<\/span>\r\n\t\t\t<\/span>\r\n\t\t\t\t\t\t<span class=\"grve-structured-data vcard author\" itemprop=\"author\" itemscope itemtype=\"http:\/\/schema.org\/Person\">\r\n\t\t\t\t<span itemprop=\"name\" class=\"fn\">REIVAX<\/span>\r\n\t\t\t<\/span>\r\n\t\t\t<span class=\"grve-structured-data\" itemprop=\"publisher\" itemscope itemtype=\"http:\/\/schema.org\/Organization\">\r\n\t\t\t\t<span itemprop='name'>REIVAX<\/span>\r\n\t\t\t\t<span itemprop='logo' itemscope itemtype='http:\/\/schema.org\/ImageObject'>\r\n\t\t\t\t\t<span itemprop='url'>\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/01\/Logo-Reivax.png<\/span>\r\n\t\t\t\t<\/span>\r\n\t\t\t<\/span>\r\n\t\t\t\t\t\t<time class=\"grve-structured-data date published\" itemprop=\"datePublished\" datetime=\"2024-12-13T15:27:29-05:00\">December 13, 2024<\/time>\r\n\t\t\t<time class=\"grve-structured-data date updated\" itemprop=\"dateModified\"  datetime=\"2025-09-05T09:45:36-04:00\">September 5, 2025<\/time>\r\n\t\t\t<span class=\"grve-structured-data\" itemprop=\"mainEntityOfPage\" itemscope itemtype=\"http:\/\/schema.org\/WebPage\" itemid=\"https:\/\/www.reivax.com\/us\/life-extension-upgrade-on-a-ge-ex2100e-exciter\/\"><\/span>\r\n\t\t<\/span>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<ul class=\"grve-post-meta\">\r\n\t\t\t\t\t\t\t\t\t\t<li class=\"grve-post-date\">\t<time class=\"\" datetime=\"2024-12-13T15:27:29-05:00\">\r\n\t\tDecember 13, 2024\t<\/time>\r\n<\/li>\t\t\t\t\t\t\t\t\t\t<\/ul>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<ul class=\"grve-categories\">\t<li class=\"cat-item cat-item-49\"><a href=\"https:\/\/www.reivax.com\/us\/category\/cases\/\">Cases<\/a>\n<\/li>\n\t<li class=\"cat-item cat-item-1600\"><a href=\"https:\/\/www.reivax.com\/us\/category\/cases\/cases-excitation\/\">Cases &#8211; Excitation<\/a>\n<\/li>\n\t<li class=\"cat-item cat-item-1609\"><a href=\"https:\/\/www.reivax.com\/us\/category\/cases\/excitation-cases\/\">Excitation<\/a>\n<\/li>\n<\/ul>\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.reivax.com\/us\/life-extension-upgrade-on-a-ge-ex2100e-exciter\/\" rel=\"bookmark\"><h2 class=\"grve-post-title grve-post-title-hover grve-h6\" itemprop=\"headline\">Life extension upgrade on a GE EX2100E exciter<\/h2><\/a>\t\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t<div itemprop=\"articleBody\"><p>[vc_row][vc_column][vc_column_text]Reivax upgrades GE EX2100E exciter for 226MVA generator Learn how Reivax designed, manufactured, installed and commissioned a front-end control upgrade on a GE EX2100E static&hellip;<\/p><a class=\"grve-read-more grve-link-text grve-heading-color grve-text-hover-primary-1\" href=\"https:\/\/www.reivax.com\/us\/life-extension-upgrade-on-a-ge-ex2100e-exciter\/\"><span>read more<\/span><\/a><\/div>\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\r\n\t\t\t\t<\/div>\t\t\t<\/article>\r\n\r\n\t\t\t<article class=\"grve-blog-item grve-style-2 grve-isotope-item post-21820 post type-post status-publish format-standard has-post-thumbnail hentry category-cases category-excitation-cases tag-excitation-system tag-unitrol-f-upgrade\" itemscope itemType=\"http:\/\/schema.org\/BlogPosting\">\r\n\t\t\t\t<div class=\"grve-blog-item-inner grve-isotope-item-inner\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"grve-media grve-bg-wrapper\">\r\n\t\t\t\t\t\t<div class=\"grve-bg-image\" style=\"background-image: url(https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2024\/01\/USACE_Fort_Gibson_Lake_and_Dam.jpg);\"><\/div>\r\n\t\t\t\t\t\t\t<div class=\"grve-bg-black grve-bg-overlay grve-opacity-70\"><\/div>\r\n\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t<div class=\"grve-post-content-wrapper\">\r\n\t\t\t\t\t\t\t<div class=\"grve-post-content\">\r\n\t\t\t\t\t\t\t\t<div class=\"grve-post-header\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"grve-hidden\">\r\n\t\t\t<span class=\"grve-structured-data entry-title\">Life extension upgrade on UNITROL F Static Excitation systems<\/span>\r\n\t\t\t<span class=\"grve-structured-data\" itemprop=\"image\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\">\r\n\t\t\t   <span itemprop='url' >https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2024\/01\/USACE_Fort_Gibson_Lake_and_Dam.jpg<\/span>\r\n\t\t\t   <span itemprop='height' >1500<\/span>\r\n\t\t\t   <span itemprop='width' >1201<\/span>\r\n\t\t\t<\/span>\r\n\t\t\t\t\t\t<span class=\"grve-structured-data vcard author\" itemprop=\"author\" itemscope itemtype=\"http:\/\/schema.org\/Person\">\r\n\t\t\t\t<span itemprop=\"name\" class=\"fn\">REIVAX<\/span>\r\n\t\t\t<\/span>\r\n\t\t\t<span class=\"grve-structured-data\" itemprop=\"publisher\" itemscope itemtype=\"http:\/\/schema.org\/Organization\">\r\n\t\t\t\t<span itemprop='name'>REIVAX<\/span>\r\n\t\t\t\t<span itemprop='logo' itemscope itemtype='http:\/\/schema.org\/ImageObject'>\r\n\t\t\t\t\t<span itemprop='url'>\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/01\/Logo-Reivax.png<\/span>\r\n\t\t\t\t<\/span>\r\n\t\t\t<\/span>\r\n\t\t\t\t\t\t<time class=\"grve-structured-data date published\" itemprop=\"datePublished\" datetime=\"2024-01-27T16:25:43-05:00\">January 27, 2024<\/time>\r\n\t\t\t<time class=\"grve-structured-data date updated\" itemprop=\"dateModified\"  datetime=\"2025-09-23T20:13:12-04:00\">September 23, 2025<\/time>\r\n\t\t\t<span class=\"grve-structured-data\" itemprop=\"mainEntityOfPage\" itemscope itemtype=\"http:\/\/schema.org\/WebPage\" itemid=\"https:\/\/www.reivax.com\/us\/life-extension-upgrade-on-unitrol-f-static-excitation-systems\/\"><\/span>\r\n\t\t<\/span>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<ul class=\"grve-post-meta\">\r\n\t\t\t\t\t\t\t\t\t\t<li class=\"grve-post-date\">\t<time class=\"\" datetime=\"2024-01-27T16:25:43-05:00\">\r\n\t\tJanuary 27, 2024\t<\/time>\r\n<\/li>\t\t\t\t\t\t\t\t\t\t<\/ul>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<ul class=\"grve-categories\">\t<li class=\"cat-item cat-item-49\"><a href=\"https:\/\/www.reivax.com\/us\/category\/cases\/\">Cases<\/a>\n<\/li>\n\t<li class=\"cat-item cat-item-1609\"><a href=\"https:\/\/www.reivax.com\/us\/category\/cases\/excitation-cases\/\">Excitation<\/a>\n<\/li>\n<\/ul>\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.reivax.com\/us\/life-extension-upgrade-on-unitrol-f-static-excitation-systems\/\" rel=\"bookmark\"><h2 class=\"grve-post-title grve-post-title-hover grve-h6\" itemprop=\"headline\">Life extension upgrade on UNITROL F Static Excitation systems<\/h2><\/a>\t\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t<div itemprop=\"articleBody\"><p>[vc_row][vc_column][vc_column_text] REIVAX performs life extension upgrade on UNITROL F Static Excitation systems Learn how Reivax REIVAX performed four (4) front-end control upgrades on aging ABB&hellip;<\/p><a class=\"grve-read-more grve-link-text grve-heading-color grve-text-hover-primary-1\" href=\"https:\/\/www.reivax.com\/us\/life-extension-upgrade-on-unitrol-f-static-excitation-systems\/\"><span>read more<\/span><\/a><\/div>\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\r\n\t\t\t\t<\/div>\t\t\t<\/article>\r\n\r\n\t\t\t<article class=\"grve-blog-item grve-style-2 grve-isotope-item post-21590 post type-post status-publish format-standard has-post-thumbnail hentry category-cases category-excitation-cases tag-excitation-system tag-synchronous-condenser\" itemscope itemType=\"http:\/\/schema.org\/BlogPosting\">\r\n\t\t\t\t<div class=\"grve-blog-item-inner grve-isotope-item-inner\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"grve-media grve-bg-wrapper\">\r\n\t\t\t\t\t\t<div class=\"grve-bg-image\" style=\"background-image: url(https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2024\/01\/Synchronous-condenser-motor.jpg);\"><\/div>\r\n\t\t\t\t\t\t\t<div class=\"grve-bg-black grve-bg-overlay grve-opacity-70\"><\/div>\r\n\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t<div class=\"grve-post-content-wrapper\">\r\n\t\t\t\t\t\t\t<div class=\"grve-post-content\">\r\n\t\t\t\t\t\t\t\t<div class=\"grve-post-header\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"grve-hidden\">\r\n\t\t\t<span class=\"grve-structured-data entry-title\">Excitation system for Synchronous Condenser<\/span>\r\n\t\t\t<span class=\"grve-structured-data\" itemprop=\"image\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\">\r\n\t\t\t   <span itemprop='url' >https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2024\/01\/Synchronous-condenser-motor.jpg<\/span>\r\n\t\t\t   <span itemprop='height' >936<\/span>\r\n\t\t\t   <span itemprop='width' >516<\/span>\r\n\t\t\t<\/span>\r\n\t\t\t\t\t\t<span class=\"grve-structured-data vcard author\" itemprop=\"author\" itemscope itemtype=\"http:\/\/schema.org\/Person\">\r\n\t\t\t\t<span itemprop=\"name\" class=\"fn\">REIVAX<\/span>\r\n\t\t\t<\/span>\r\n\t\t\t<span class=\"grve-structured-data\" itemprop=\"publisher\" itemscope itemtype=\"http:\/\/schema.org\/Organization\">\r\n\t\t\t\t<span itemprop='name'>REIVAX<\/span>\r\n\t\t\t\t<span itemprop='logo' itemscope itemtype='http:\/\/schema.org\/ImageObject'>\r\n\t\t\t\t\t<span itemprop='url'>\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/01\/Logo-Reivax.png<\/span>\r\n\t\t\t\t<\/span>\r\n\t\t\t<\/span>\r\n\t\t\t\t\t\t<time class=\"grve-structured-data date published\" itemprop=\"datePublished\" datetime=\"2023-04-17T12:57:09-04:00\">April 17, 2023<\/time>\r\n\t\t\t<time class=\"grve-structured-data date updated\" itemprop=\"dateModified\"  datetime=\"2025-09-24T10:32:00-04:00\">September 24, 2025<\/time>\r\n\t\t\t<span class=\"grve-structured-data\" itemprop=\"mainEntityOfPage\" itemscope itemtype=\"http:\/\/schema.org\/WebPage\" itemid=\"https:\/\/www.reivax.com\/us\/excitation-system-synchronous-condenser\/\"><\/span>\r\n\t\t<\/span>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<ul class=\"grve-post-meta\">\r\n\t\t\t\t\t\t\t\t\t\t<li class=\"grve-post-date\">\t<time class=\"\" datetime=\"2023-04-17T12:57:09-04:00\">\r\n\t\tApril 17, 2023\t<\/time>\r\n<\/li>\t\t\t\t\t\t\t\t\t\t<\/ul>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<ul class=\"grve-categories\">\t<li class=\"cat-item cat-item-49\"><a href=\"https:\/\/www.reivax.com\/us\/category\/cases\/\">Cases<\/a>\n<\/li>\n\t<li class=\"cat-item cat-item-1609\"><a href=\"https:\/\/www.reivax.com\/us\/category\/cases\/excitation-cases\/\">Excitation<\/a>\n<\/li>\n<\/ul>\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.reivax.com\/us\/excitation-system-synchronous-condenser\/\" rel=\"bookmark\"><h2 class=\"grve-post-title grve-post-title-hover grve-h6\" itemprop=\"headline\">Excitation system for Synchronous Condenser<\/h2><\/a>\t\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t<div itemprop=\"articleBody\"><p>[vc_row][vc_column][vc_column_text]REIVAX completes installation of a Static Excitation system for a Synchronous Condenser Learn how Reivax designed, manufactured, installed and commissioned a static excitation system for&hellip;<\/p><a class=\"grve-read-more grve-link-text grve-heading-color grve-text-hover-primary-1\" href=\"https:\/\/www.reivax.com\/us\/excitation-system-synchronous-condenser\/\"><span>read more<\/span><\/a><\/div>\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\r\n\t\t\t\t<\/div>\t\t\t<\/article>\r\n\r\n\t\t\t<article class=\"grve-blog-item grve-style-2 grve-isotope-item post-21169 post type-post status-publish format-standard has-post-thumbnail hentry category-cases category-excitation-cases tag-excitation-system\" itemscope itemType=\"http:\/\/schema.org\/BlogPosting\">\r\n\t\t\t\t<div class=\"grve-blog-item-inner grve-isotope-item-inner\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"grve-media grve-bg-wrapper\">\r\n\t\t\t\t\t\t<div class=\"grve-bg-image\" style=\"background-image: url(https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2022\/12\/Reivax-RTX-Power-Static-Excitation-Systems-1920x1080.jpg);\"><\/div>\r\n\t\t\t\t\t\t\t<div class=\"grve-bg-black grve-bg-overlay grve-opacity-70\"><\/div>\r\n\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t<div class=\"grve-post-content-wrapper\">\r\n\t\t\t\t\t\t\t<div class=\"grve-post-content\">\r\n\t\t\t\t\t\t\t\t<div class=\"grve-post-header\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"grve-hidden\">\r\n\t\t\t<span class=\"grve-structured-data entry-title\">Cordell Hull &#8211; MG set conversion to Static Excitation system<\/span>\r\n\t\t\t<span class=\"grve-structured-data\" itemprop=\"image\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\">\r\n\t\t\t   <span itemprop='url' >https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2022\/12\/Reivax-RTX-Power-Static-Excitation-Systems-scaled.jpg<\/span>\r\n\t\t\t   <span itemprop='height' >2560<\/span>\r\n\t\t\t   <span itemprop='width' >1440<\/span>\r\n\t\t\t<\/span>\r\n\t\t\t\t\t\t<span class=\"grve-structured-data vcard author\" itemprop=\"author\" itemscope itemtype=\"http:\/\/schema.org\/Person\">\r\n\t\t\t\t<span itemprop=\"name\" class=\"fn\">REIVAX<\/span>\r\n\t\t\t<\/span>\r\n\t\t\t<span class=\"grve-structured-data\" itemprop=\"publisher\" itemscope itemtype=\"http:\/\/schema.org\/Organization\">\r\n\t\t\t\t<span itemprop='name'>REIVAX<\/span>\r\n\t\t\t\t<span itemprop='logo' itemscope itemtype='http:\/\/schema.org\/ImageObject'>\r\n\t\t\t\t\t<span itemprop='url'>\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/01\/Logo-Reivax.png<\/span>\r\n\t\t\t\t<\/span>\r\n\t\t\t<\/span>\r\n\t\t\t\t\t\t<time class=\"grve-structured-data date published\" itemprop=\"datePublished\" datetime=\"2022-12-22T14:36:52-05:00\">December 22, 2022<\/time>\r\n\t\t\t<time class=\"grve-structured-data date updated\" itemprop=\"dateModified\"  datetime=\"2025-09-24T10:46:23-04:00\">September 24, 2025<\/time>\r\n\t\t\t<span class=\"grve-structured-data\" itemprop=\"mainEntityOfPage\" itemscope itemtype=\"http:\/\/schema.org\/WebPage\" itemid=\"https:\/\/www.reivax.com\/us\/cordell-hull-mg-sets-conversion-to-static-excitation-systems\/\"><\/span>\r\n\t\t<\/span>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<ul class=\"grve-post-meta\">\r\n\t\t\t\t\t\t\t\t\t\t<li class=\"grve-post-date\">\t<time class=\"\" datetime=\"2022-12-22T14:36:52-05:00\">\r\n\t\tDecember 22, 2022\t<\/time>\r\n<\/li>\t\t\t\t\t\t\t\t\t\t<\/ul>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<ul class=\"grve-categories\">\t<li class=\"cat-item cat-item-49\"><a href=\"https:\/\/www.reivax.com\/us\/category\/cases\/\">Cases<\/a>\n<\/li>\n\t<li class=\"cat-item cat-item-1609\"><a href=\"https:\/\/www.reivax.com\/us\/category\/cases\/excitation-cases\/\">Excitation<\/a>\n<\/li>\n<\/ul>\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.reivax.com\/us\/cordell-hull-mg-sets-conversion-to-static-excitation-systems\/\" rel=\"bookmark\"><h2 class=\"grve-post-title grve-post-title-hover grve-h6\" itemprop=\"headline\">Cordell Hull &#8211; MG set conversion to Static Excitation system<\/h2><\/a>\t\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t<div itemprop=\"articleBody\"><p>[vc_row][vc_column][vc_column_text] REIVAX COMPLETES CORDELL HULL EXCITER PROJECT Learn how Reivax replaced the existing MG sets, rotating DC exciters and rheostat exciter controls with new RTX&hellip;<\/p><a class=\"grve-read-more grve-link-text grve-heading-color grve-text-hover-primary-1\" href=\"https:\/\/www.reivax.com\/us\/cordell-hull-mg-sets-conversion-to-static-excitation-systems\/\"><span>read more<\/span><\/a><\/div>\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\r\n\t\t\t\t<\/div>\t\t\t<\/article>\r\n\r\n\t\t\t<article class=\"grve-blog-item grve-style-2 grve-isotope-item post-21266 post type-post status-publish format-standard has-post-thumbnail hentry category-cases category-excitation-cases tag-siemens-steam-turbine tag-unitrol-f-upgrade\" itemscope itemType=\"http:\/\/schema.org\/BlogPosting\">\r\n\t\t\t\t<div class=\"grve-blog-item-inner grve-isotope-item-inner\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"grve-media grve-bg-wrapper\">\r\n\t\t\t\t\t\t<div class=\"grve-bg-image\" style=\"background-image: url(https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2023\/01\/Gas-turbine-1920x1080.jpg);\"><\/div>\r\n\t\t\t\t\t\t\t<div class=\"grve-bg-black grve-bg-overlay grve-opacity-70\"><\/div>\r\n\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t<div class=\"grve-post-content-wrapper\">\r\n\t\t\t\t\t\t\t<div class=\"grve-post-content\">\r\n\t\t\t\t\t\t\t\t<div class=\"grve-post-header\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"grve-hidden\">\r\n\t\t\t<span class=\"grve-structured-data entry-title\">REIVAX installs exciter on Siemens steam turbine<\/span>\r\n\t\t\t<span class=\"grve-structured-data\" itemprop=\"image\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\">\r\n\t\t\t   <span itemprop='url' >https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2023\/01\/Gas-turbine-scaled.jpg<\/span>\r\n\t\t\t   <span itemprop='height' >2560<\/span>\r\n\t\t\t   <span itemprop='width' >1440<\/span>\r\n\t\t\t<\/span>\r\n\t\t\t\t\t\t<span class=\"grve-structured-data vcard author\" itemprop=\"author\" itemscope itemtype=\"http:\/\/schema.org\/Person\">\r\n\t\t\t\t<span itemprop=\"name\" class=\"fn\">REIVAX<\/span>\r\n\t\t\t<\/span>\r\n\t\t\t<span class=\"grve-structured-data\" itemprop=\"publisher\" itemscope itemtype=\"http:\/\/schema.org\/Organization\">\r\n\t\t\t\t<span itemprop='name'>REIVAX<\/span>\r\n\t\t\t\t<span itemprop='logo' itemscope itemtype='http:\/\/schema.org\/ImageObject'>\r\n\t\t\t\t\t<span itemprop='url'>\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/01\/Logo-Reivax.png<\/span>\r\n\t\t\t\t<\/span>\r\n\t\t\t<\/span>\r\n\t\t\t\t\t\t<time class=\"grve-structured-data date published\" itemprop=\"datePublished\" datetime=\"2022-10-15T13:55:07-04:00\">October 15, 2022<\/time>\r\n\t\t\t<time class=\"grve-structured-data date updated\" itemprop=\"dateModified\"  datetime=\"2025-09-02T14:05:56-04:00\">September 2, 2025<\/time>\r\n\t\t\t<span class=\"grve-structured-data\" itemprop=\"mainEntityOfPage\" itemscope itemtype=\"http:\/\/schema.org\/WebPage\" itemid=\"https:\/\/www.reivax.com\/us\/reivax-installs-excitation-system-for-siemens-steam-turbine\/\"><\/span>\r\n\t\t<\/span>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<ul class=\"grve-post-meta\">\r\n\t\t\t\t\t\t\t\t\t\t<li class=\"grve-post-date\">\t<time class=\"\" datetime=\"2022-10-15T13:55:07-04:00\">\r\n\t\tOctober 15, 2022\t<\/time>\r\n<\/li>\t\t\t\t\t\t\t\t\t\t<\/ul>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<ul class=\"grve-categories\">\t<li class=\"cat-item cat-item-49\"><a href=\"https:\/\/www.reivax.com\/us\/category\/cases\/\">Cases<\/a>\n<\/li>\n\t<li class=\"cat-item cat-item-1609\"><a href=\"https:\/\/www.reivax.com\/us\/category\/cases\/excitation-cases\/\">Excitation<\/a>\n<\/li>\n<\/ul>\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.reivax.com\/us\/reivax-installs-excitation-system-for-siemens-steam-turbine\/\" rel=\"bookmark\"><h2 class=\"grve-post-title grve-post-title-hover grve-h6\" itemprop=\"headline\">REIVAX installs exciter on Siemens steam turbine<\/h2><\/a>\t\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t<div itemprop=\"articleBody\"><p>[vc_row][vc_column][vc_column_text] REIVAX replaces UNITROL F static excitation system on a Siemens steam turbine Learn how Reivax designed, manufactured, installed and commissioned a static excitation system&hellip;<\/p><a class=\"grve-read-more grve-link-text grve-heading-color grve-text-hover-primary-1\" href=\"https:\/\/www.reivax.com\/us\/reivax-installs-excitation-system-for-siemens-steam-turbine\/\"><span>read more<\/span><\/a><\/div>\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\r\n\t\t\t\t<\/div>\t\t\t<\/article>\r\n\r\n\t\t\t<article class=\"grve-blog-item grve-style-2 grve-isotope-item post-20657 post type-post status-publish format-standard has-post-thumbnail hentry category-cases category-excitation-cases tag-basler-sse250-retrofit\" itemscope itemType=\"http:\/\/schema.org\/BlogPosting\">\r\n\t\t\t\t<div class=\"grve-blog-item-inner grve-isotope-item-inner\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"grve-media grve-bg-wrapper\">\r\n\t\t\t\t\t\t<div class=\"grve-bg-image\" style=\"background-image: url(https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2021\/11\/Plant-exterior-4-1920x535.jpg);\"><\/div>\r\n\t\t\t\t\t\t\t<div class=\"grve-bg-black grve-bg-overlay grve-opacity-70\"><\/div>\r\n\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t<div class=\"grve-post-content-wrapper\">\r\n\t\t\t\t\t\t\t<div class=\"grve-post-content\">\r\n\t\t\t\t\t\t\t\t<div class=\"grve-post-header\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"grve-hidden\">\r\n\t\t\t<span class=\"grve-structured-data entry-title\">REIVAX replaces Basler excitation system in record time<\/span>\r\n\t\t\t<span class=\"grve-structured-data\" itemprop=\"image\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\">\r\n\t\t\t   <span itemprop='url' >https:\/\/www.reivax.com\/us\/wp-content\/uploads\/2021\/11\/Plant-exterior-4-e1636996387960.jpg<\/span>\r\n\t\t\t   <span itemprop='height' >1434<\/span>\r\n\t\t\t   <span itemprop='width' >400<\/span>\r\n\t\t\t<\/span>\r\n\t\t\t\t\t\t<span class=\"grve-structured-data vcard author\" itemprop=\"author\" itemscope itemtype=\"http:\/\/schema.org\/Person\">\r\n\t\t\t\t<span itemprop=\"name\" class=\"fn\">REIVAX<\/span>\r\n\t\t\t<\/span>\r\n\t\t\t<span class=\"grve-structured-data\" itemprop=\"publisher\" itemscope itemtype=\"http:\/\/schema.org\/Organization\">\r\n\t\t\t\t<span itemprop='name'>REIVAX<\/span>\r\n\t\t\t\t<span itemprop='logo' itemscope itemtype='http:\/\/schema.org\/ImageObject'>\r\n\t\t\t\t\t<span itemprop='url'>\/\/www.reivax.com\/us\/wp-content\/uploads\/2019\/01\/Logo-Reivax.png<\/span>\r\n\t\t\t\t<\/span>\r\n\t\t\t<\/span>\r\n\t\t\t\t\t\t<time class=\"grve-structured-data date published\" itemprop=\"datePublished\" datetime=\"2021-11-14T20:57:44-05:00\">November 14, 2021<\/time>\r\n\t\t\t<time class=\"grve-structured-data date updated\" itemprop=\"dateModified\"  datetime=\"2025-08-19T13:56:39-04:00\">August 19, 2025<\/time>\r\n\t\t\t<span class=\"grve-structured-data\" itemprop=\"mainEntityOfPage\" itemscope itemtype=\"http:\/\/schema.org\/WebPage\" itemid=\"https:\/\/www.reivax.com\/us\/reivax-delivers-a-new-static-excitation-system-in-record-time\/\"><\/span>\r\n\t\t<\/span>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<ul class=\"grve-post-meta\">\r\n\t\t\t\t\t\t\t\t\t\t<li class=\"grve-post-date\">\t<time class=\"\" datetime=\"2021-11-14T20:57:44-05:00\">\r\n\t\tNovember 14, 2021\t<\/time>\r\n<\/li>\t\t\t\t\t\t\t\t\t\t<\/ul>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<ul class=\"grve-categories\">\t<li class=\"cat-item cat-item-49\"><a href=\"https:\/\/www.reivax.com\/us\/category\/cases\/\">Cases<\/a>\n<\/li>\n\t<li class=\"cat-item cat-item-1609\"><a href=\"https:\/\/www.reivax.com\/us\/category\/cases\/excitation-cases\/\">Excitation<\/a>\n<\/li>\n<\/ul>\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.reivax.com\/us\/reivax-delivers-a-new-static-excitation-system-in-record-time\/\" rel=\"bookmark\"><h2 class=\"grve-post-title grve-post-title-hover grve-h6\" itemprop=\"headline\">REIVAX replaces Basler excitation system in record time<\/h2><\/a>\t\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t<div itemprop=\"articleBody\"><p>[vc_row][vc_column][vc_column_text]REIVAX delivers a new static excitation system in record time A 4.3MVA northeast utility owner experienced a failure in their existing static excitation system, resulting&hellip;<\/p><a class=\"grve-read-more grve-link-text grve-heading-color grve-text-hover-primary-1\" href=\"https:\/\/www.reivax.com\/us\/reivax-delivers-a-new-static-excitation-system-in-record-time\/\"><span>read more<\/span><\/a><\/div>\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\r\n\t\t\t\t<\/div>\t\t\t<\/article>\r\n\r\n\t\t\t<\/div>\r\n\t\t<\/div>\r\n[\/vc_column][\/vc_row][vc_row section_type=&#8221;fullwidth&#8221; padding_bottom_multiplier=&#8221;&#8221; columns_gap=&#8221;none&#8221; margin_bottom=&#8221;-50px&#8221;][vc_column][rev_slider_vc alias=&#8221;hotsite01&#8243;]\t\t\t<div class=\"grve-modal-element mfp-hide\" id=\"reivaxwhere\">\r\n\t\t\t\t<div class=\"grve-section\">\r\n\t\t\t\t\t<div class=\"grve-container\">\r\n\t\t\t\t\t\t<div class=\"grve-row grve-columns-gap-30\">\r\n\t\t\t\t\t\t\t<div class=\"grve-column grve-column-1\">\r\n\t\t\t\t\t\t\t<div class=\"grve-map-wrapper\"><div class=\"grve-element grve-map\" data-lat=\"45.505209\" data-lng=\"-73.573053\" data-zoom=\"14\" data-disable-style=\"yes\" style=\"height: 450px;\"><\/div>  <div style=\"display:none\" class=\"grve-map-point\" data-point-marker=\"\/\/www.reivax.com\/us\/wp-content\/themes\/movedo\/images\/markers\/transparent.png\" data-point-lat=\"45.505209\" data-point-lng=\"-73.573053\" data-point-title=\"\" data-point-type=\"pulse-dot\" data-point-marker-width=\"\" data-point-marker-height=\"\" data-point-bg-color=\"primary-1\"><\/div><\/div>\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t\t<\/div>\r\n\t\t\t\t\t<\/div>\r\n\t\t\t\t<\/div>\r\n\t\t\t<\/div>\r\n\t\t[\/vc_column][\/vc_row]<\/p>\n<\/section>","protected":false},"excerpt":{"rendered":"<p>Reivax developed an excitation system specification that covers the most common industry requirements: and it is free for you.<\/p>\n","protected":false},"author":6,"featured_media":0,"parent":16654,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"yst_prominent_words":[859,197,171,189,165,856,627,855,137,644,626,857,164,161,630,596,139,861,858,628],"class_list":["post-19426","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.reivax.com\/us\/wp-json\/wp\/v2\/pages\/19426","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.reivax.com\/us\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.reivax.com\/us\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.reivax.com\/us\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.reivax.com\/us\/wp-json\/wp\/v2\/comments?post=19426"}],"version-history":[{"count":0,"href":"https:\/\/www.reivax.com\/us\/wp-json\/wp\/v2\/pages\/19426\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/www.reivax.com\/us\/wp-json\/wp\/v2\/pages\/16654"}],"wp:attachment":[{"href":"https:\/\/www.reivax.com\/us\/wp-json\/wp\/v2\/media?parent=19426"}],"wp:term":[{"taxonomy":"yst_prominent_words","embeddable":true,"href":"https:\/\/www.reivax.com\/us\/wp-json\/wp\/v2\/yst_prominent_words?post=19426"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}