GE DS200SHVIG1 SCR High Voltage Interface Board

الوصف

The GE DS200SHVIG1 is a critical SCR High Voltage Interface Board (SHVI) used in the GE Mark V Speedtronic Turbine Control System and the EX2000/DC2000 Drive Series.¹

Its primary role is to isolate and condition high-voltage and high-current feedback signals from the drive’s power section (the SCR bridge) before they are sent to the sensitive low-voltage control electronics.

Core Functions and Features

The SHVIG1 acts as the buffer and measurement front-end between the high-power circuitry and the control cards (like the SDCI or DCFB power supply/instrumentation board).²

1. High-Voltage Signal Conditioning³

The board attenuates and isolates high-voltage signals from the main power bridge:⁴

• Voltage Attenuation: It steps down the high ⁵$\text{AC}$ line voltage and ⁶$\text{DC}$ bridge voltage to a level that can be safely processed by the control circuitry.⁷ This is essential for monitoring and protecting the SCR bridge.

   

• Signal Isolation: It ensures galvanic isolation between the dangerous high-voltage power components and the control circuits, protecting personnel and sensitive electronics.

2. Current Signal Conversion and Isolation

The SHVIG1 handles the critical current feedback:

• Shunt Signal Conversion: It takes the low-level ⁸$\text{mV}$ signals from the current shunts (typically ranging from ⁹$\pm 500 \text{ mV}$) and converts them into differential frequency outputs (e.g., ¹⁰$0 \text{ to } 500 \text{ kHz}$).¹¹ Frequency signals are highly immune to electrical noise, making them ideal for reliable transmission across the cabinet.

   

• Current Attenuation (Jumpers): The board features configurable jumpers (often 17 of them) that use ¹²$10:1$ current transformers to provide additional, selectable current attenuation.¹³ This allows the board to be configured for a specific range of power components.

   

3. Interface and Diagnostics

• Communication Bridge: It serves as the interface between the SCR bridge, the Power Connect Card (PCCA), and the Power Supply/Instrumentation Card (SDCI or DCFB).¹⁴

   

• Contactor Drivers: It often includes driver circuits for both standard and fast contactors used in the drive system’s power control.¹⁵

   

• Fault Indication: It may include indicator LEDs to provide a visual alert when certain internal line filter fuses are blown, aiding in immediate fault detection.¹⁶

   

Part Number Breakdown (DS200SHVIG1)

The part number structure for the SHVI board reveals its role:

The DS200SHVIG1 is a complex and vital interface board, absolutely essential for the safe operation, accurate current/voltage measurement, and protective functions of a GE DC drive or exciter system.

Note on SHVI vs. SHVM

You may encounter the DS200SHVMG1 (M-Frame) board.¹⁷ Both are SCR High Voltage Interface boards, but the SHVM is often a smaller version (mini-SHVI) used for applications with lower voltage DC field ratings, while the SHVI is the full-featured interface for the main SCR power bridge.