Description
GE VMIVME-7698-345 Technical Specifications:
- System Platform: GE Multilin / Mark VI Control System.
- Function: CT/VT signal conditioning and calibration.
- Input Signals: Analog inputs from Current Transformers (CT) and Voltage Transformers (VT).
- Communication: High-speed VMEbus backplane interface.
- Revision: 350-017698-345 specific hardware revision.
Functional Features:
- Precision Calibration: Provides factory-calibrated scaling for highly accurate measurement of voltage, current, and frequency.
- Signal Isolation: Galvanically isolated analog inputs to protect the VME system from high-voltage transients.
- Protection Logic: Supports overcurrent, undervoltage, and differential protection algorithms.
- Self-Testing: Continuous internal diagnostics to verify measurement integrity.
Application Scenarios:
- Generator and transformer protection in power plants.
- Motor protection and monitoring in petrochemical facilities.
- Substation automation and feeder protection.
- Calibration of electrical metering systems.
Performance Parameters:
- Accuracy: High-precision analog-to-digital conversion with minimal drift over temperature.
- Response Time: Ultra-fast relay trip times to clear electrical faults.
- Sampling Rate: High-frequency sampling to capture transient fault waveforms.
- Input Range: Wide dynamic range to handle both normal load and fault conditions.
Material Composition & Structural Characteristics:
- PCB: Multi-layer board with precision analog components and isolated power supplies.
- Components: High-accuracy operational amplifiers, precision resistors, and isolation transformers.
- Form Factor: Standard VME 6U Eurocard.
- Connectors: Heavy-duty VME P1 and P2 backplane connectors.
Working Principle: The module receives scaled-down analog signals from external CTs and VTs. These signals are buffered, filtered, and isolated before being digitized by high-resolution ADCs. The digital values are calibrated using stored correction factors and transmitted over the VME bus to the main protection CPU, which executes the protection logic.
Installation Requirements:
- Wiring: Use shielded cables for all CT/VT inputs, ensuring proper grounding at the terminal board.
- CT Shorting: Always short CT secondaries before disconnecting them from the module to prevent lethal voltage spikes.
- Slot Placement: Install in a system controller or designated peripheral slot in the VME chassis.
- Configuration: Load the correct calibration constants via the Multilin configuration software.
Usage Precautions:
- High Voltage Hazard: Although the module operates at low voltage, the connected CT/VT circuits carry lethal voltages. Follow strict LOTO procedures.
- Calibration Integrity: Do not attempt to adjust internal calibration potentiometers; recalibration requires factory equipment.
- Firmware Matching: Ensure the module hardware revision matches the Multilin firmware version.
- Replacement: Replace only with the exact part number (350-017698-345) to maintain system certification.
