Description
GE IS200EPSMG2ADC — Excitation Power Supply Module
Product: IS200EPSMG2ADC, Excitation Power Supply Module
Manufacturer: GE (General Electric), part of the Mark VIe Speedtronic Turbine Control System family.
Primary Application: A critical power supply module within GE’s Mark VIe control system, specifically designed to provide regulated and isolated DC power for the excitation system of a gas or steam turbine generator.
1. Core Overview & System Context
The IS200EPSMG2ADC is a dedicated component within GE’s Mark VIe platform, one of the most widely used distributed control systems (DCS) for turbine management. The «EPSM» acronym stands for Excitation Power Supply Module.
Key Function: It acts as the primary or auxiliary DC power source for the Static Exciter or Excitation System that supplies the generator’s field current. Its reliable operation is essential for maintaining proper generator terminal voltage and reactive power (VAR) control.
2. Key Features & Functions
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Dual-Channel / Redundant Design: As part of the Mark VIe architecture, this module likely supports or interfaces with a redundant configuration. Multiple EPSM modules can be used to ensure high availability of excitation power, a critical requirement for generator stability.
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Regulated DC Output: Converts incoming AC or DC control power into a clean, stable, and regulated DC output suitable for powering the excitation system’s firing circuits and control electronics.
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Isolation & Protection: Provides electrical isolation between the control system and the high-power excitation circuits. Includes protection features such as:
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Overvoltage protection
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Overcurrent/short-circuit protection
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Thermal protection
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Monitoring & Diagnostics: Equipped with status indicators (LEDs) and communicates health and status data back to the Mark VIe controller via the VME backplane or dedicated I/O network. Faults are annunciated in the control system HMI (CIMPLICITY/TOOLBOXST).
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Hot-Swappable: Designed to be hot-swappable (in a properly configured redundant system), allowing for replacement without shutting down the turbine, maximizing availability.
3. Common Technical Specifications (General for EPSM Series)
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Input Power: Typically sourced from the turbine’s 120V AC or 125V DC control power bus.
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Output Power: Provides a regulated DC output (e.g., +125V DC, ±15V DC, or other logic/drive voltages) specific to the needs of the connected excitation system components.
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Form Factor: A single-slot VME board designed to plug into a Mark VIe IS200-series rack or I/O pack.
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Communication: Integrates with the Mark VIe system via the VME backplane. Status and diagnostic data are accessible through the controller.
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Cooling: May require adequate airflow within the rack, as specified by Mark VIe environmental guidelines.
4. System Integration
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Location: Installed in a Mark VIe I/O Pack or Controller Rack (e.g., an IS200 I/O pack dedicated to excitation control).
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Role in Excitation Loop: It powers the circuits within the Excitation Control Module (EX2000, EX2100, etc.) and the firing circuits of the thyristor bridges that ultimately supply the generator’s rotor field.
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Control System: Fully monitored by the Mark VIe Turbine Control Controller (TCC) and/or Excitation Control Controller. Loss of power from this module would trigger alarms and potentially an excitation system fault.
5. Typical Applications
This module is used exclusively in GE turbine-generator sets controlled by Mark VIe systems:
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Gas Turbine Power Plants (Frame 6, 7, 9 series)
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Steam Turbine Power Plants
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Combined-Cycle Power Plants
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