Description
GE SR489-P5-HI-A20-E
Technical Specifications:
- Series: GE Multilin SR489 Generator Management Relay
- Phase CT Secondary: 5 A (P5)
- Control Power: HI = 90–300 V DC, 70–265 V AC, 48–62 Hz
- Analog Output: 4–20 mA (A20)
- Display: Enhanced (E) with larger LCD
- Communication: RS-232, RS-485/RS-422, Modbus RTU, DNP 3.0
- Fuse Rating: 2.5 A, 5×20 mm HRC SLO-BLO Littelfuse 215-02.5
- Software: EnerVista 489 Setup
- Conformal Coating: No (standard environment)
Functional Features:
- Comprehensive generator protection: differential, overcurrent, overvoltage, undervoltage, over/under-frequency, loss of field, reverse power, negative sequence, stator ground fault, breaker failure, VT fuse failure
- Enhanced display with larger LCD for local diagnostics
- Output status LEDs: 1 trip, 2 auxiliary, 3 auxiliary, 4 auxiliary, 5 alarm, 6 service
- Generator status LEDs: breaker open, breaker closed, stator overheat, negative sequence, ground, loss of field, VT fault, breaker failure
- 489 status LEDs: 489 in service, setpoint access, computer RS232, computer RS485/aux RS485, alternate setpoint, reset, message
- Flash memory for firmware upgrades
- Simulation, trip coil monitoring, breaker failure, drawout case
- Comprehensive metering: RPM, RTD, power factor, frequency, MW, Mvar, MWh, MVA demand, current (phasor), voltage (phasor)
- Communication protocols: Modbus RTU, DNP 3.0
Application Scenarios:
- Generator protection in power plants with 5 A CT secondaries
- Industrial cogeneration facilities
- Diesel and gas generator backup systems
- Hydroelectric and wind generator protection
- SCADA-integrated generator monitoring via Modbus RTU or DNP 3.0
Performance Parameters:
- Comprehensive metering of generator electrical parameters
- Fast-acting protection elements for generator fault clearance
- Enhanced display improves local diagnostic visibility
- Flash-upgradable firmware for feature updates
- Multiple communication protocols for SCADA integration
Material and Structural Characteristics:
- Drawout relay case with matching enclosure (SR construction)
- Industrial-grade PCB with high-reliability components
- Front panel with enhanced LCD, output status LEDs, generator status LEDs, 489 status LEDs, keypad
- RS-232 port on front panel; RS-485/RS-422 on rear panel
- Rear terminal blocks for CT, VT, control power, and I/O
- Fuse holder (2.5 A, 5×20 mm HRC SLO-BLO)
Working Principle: Identical to SR489-P1-LO-A20-E, with 5 A phase CT secondary and high control power range. The relay samples generator currents and voltages, executes protection algorithms, and trips the generator breaker when setpoints are exceeded. The enhanced display and status LEDs provide comprehensive local diagnostic visibility. Communication via Modbus RTU and DNP 3.0 enables SCADA integration. Installation Requirements:
- Install in a protection relay panel using the SR drawout case
- Connect 5 A phase CTs, VTs, and ground CT per schematics
- Wire control power (90–300 V DC or 70–265 V AC)
- Connect RS-232/RS-485 to SCADA; configure Modbus RTU or DNP 3.0
- Configure setpoints using EnerVista 489 Setup software
- Verify fuse (2.5 A, 5×20 mm HRC SLO-BLO Littelfuse 215-02.5) is installed
Usage Notes:
- Relay contacts are not safe to touch when energized
- Verify CT secondary rating (5 A) matches installed CTs
- Use EnerVista 489 Setup software for configuration and firmware upgrades
- For harsh environments, consider the -H conformal-coated variant
- Periodically test protection functions and verify communication links
