GE IS200VTURH2BAB Turbine Protection Circuit Board

Technical Overview

The IS200VTURH2BAB serves as the primary Turbine Protection (VTUR) module within the General Electric Mark VI Speedtronic control ecosystem. This mission-critical circuit board is engineered to provide high-speed monitoring of turbine rotational dynamics, shaft integrity, and overspeed conditions. By processing inputs from Magnetic Pick-up Units (MPUs) and passive speed sensors, the IS200VTURH2BAB executes hardware-level trip logic to energize or de-energize overspeed trip solenoids. Its architectural design focuses on fail-safe performance, ensuring that steam or gas turbines are protected from catastrophic mechanical failure through real-time processing of shaft voltage, current, and pulse-rate data.

Detailed Technical Specifications

The following parameters define the operational limits and signal processing capabilities of the IS200VTURH2BAB (Revision H2BAB):

• Manufacturer: GE Industrial Systems (General Electric US)

• Module Type: Turbine Protection Circuit Board (VTUR)

• System Series: Mark VI Turbine Control

• Nominal Power Supply: 125 VDC (Standard Control Voltage)

• MPU Pulse Rate Range: 2 Hz to 20 kHz

• Speed Measurement Accuracy: ±0.05% of actual reading

• Input Sensitivity: 27 mV peak (minimum threshold for pulse detection)

• Primary Connectivity: 1 x J5 Port (Interface to backplane/terminal boards)

• Onboard Processing: Real-time shaft voltage and current monitoring

• Operating Temperature: 0°C to +60°C (32°F to 140°F)

• Compatible Termination Modules: TTUR, TRPG, TRPS, TRPL, DRLY, DTRT, DTUR

System Interoperability and Protection Logic

The IS200VTURH2BAB is a sophisticated interface that bridges field sensors with the Mark VI VME rack. In a standard protection scheme, the board receives pulse-rate inputs from three independent MPUs to allow for Triple Modular Redundancy (TMR) voting. If a designated overspeed threshold is breached, the VTUR board communicates directly with the TRPG (Turbine Primary Emergency Trip) and TRPS (Turbine Primary Safety) modules to initiate an immediate shutdown. Beyond speed, the board monitors shaft grounding integrity by measuring shaft voltage and current, preventing bearing damage caused by stray electrical discharge.