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GE SR489-P5-HI-A20-E Integrated Management Protection Relay
I. Product Description
The GE Multilin 489 series of medium and small-sized generator sets' integrated management protection relay, P5 represents the secondary rated 5A input of the current transformer, HI is the wide-range high-voltage AC/DC control power supply, A20 supports 4-20mA analog output, E is the enhanced liquid crystal display version. It integrates the complete set of main protection, measurement, temperature monitoring, fault recording, and remote communication functions for generators. It adopts a plug-in and withdrawable structure and is mainly used for the fault tripping, safety monitoring, parameter measurement of synchronous/ asynchronous generator sets in thermal power plants, hydropower plants, and self-owned power plants. Currently, the original factory has discontinued production, and it is a commonly used core protection spare part for old power station units.
Key Technical Parameters
Full model: SR489-P5-HI-A20-E
Current input: CT secondary rated 5A, supports three-phase current and neutral point grounded current collection
Voltage input: PT voltage input, compatible with conventional 100V secondary voltage circuit
Control power supply: AC 70~265V / DC 90~300V, industrial frequency 48~62Hz
Analog quantity: 4 channels of 4-20mA isolated analog input, 4 channels of 4-20mA analog output
Temperature measurement channel: 12 channels of RTD platinum resistance input, used for stator and bearing temperature monitoring
Switch quantity: multiple digital inputs, 6 channels of relay non-polar alarm trip output, contact capacity AC 250V/5A
Communication interface: RS232, RS485, Ethernet; supports Modbus RTU/TCP, DNP3.0, IRIG-B time synchronization
Display configuration: enhanced backlit LCD liquid crystal panel, local viewing of power, set values, fault records
Operating environment temperature: -20℃ to +70℃, storage temperature - 40℃ to +85℃
Protection grade: front panel IP54, back panel terminal side IP20
Installation method: switch cabinet embedded and withdrawable installation, supports rapid replacement of plug-ins without power outage
Equipped with 2.5A built-in fuse, total machine weight approximately 1.36kg
Certifications: CE, UL power industry safety and electromagnetic compatibility certification
Product Performance
Integrated complete set of generator professional protection: stator differential, 100% stator grounding, direction grounding overcurrent, negative sequence overcurrent, overvoltage / undervoltage, overfrequency / low frequency, overexcitation, loss of excitation, reverse power, locked rotor, thermal overload, VT break line, etc. Protection functions are reliable tripping within milliseconds to avoid generator burnout.
Supports RTD multi-point temperature collection, real-time monitoring of stator winding and front and rear bearing temperatures, early warning or tripping for overtemperature, achieving early protection of generator thermal faults.
High-precision electric metering, capable of collecting three-phase voltage, current, active power, reactive power, power factor, frequency, and electricity consumption parameters, and having measurement and control metering function.
Has fault recording, SOE event sequence recording, and massive fault event storage functions, supports waveform upload, facilitating accident cause analysis and traceability; built-in simulation debugging function, can locally verify protection set values.
Multi-protocol communication compatible with power plant SCADA, DCS systems, can remotely upload operation data, alarm information, and support remote protection set value modification, protection activation/deactivation operations.
Plug-in modular structure, the main device of the device and the terminal plug-in are separated, convenient for on-site spare parts replacement, significantly reducing the downtime for generator unit maintenance.
Wide temperature and voltage industrial design, strong anti-electromagnetic interference capability, capable of stable and continuous operation in power plant dust, humidity, and strong electromagnetic working conditions.
Application Domains
Thermal power plants, hydropower plants, gas-fired power plants: Complete set of main protection and measurement for medium-sized steam turbine and water turbine generator sets Metallurgical, chemical, and cement self-owned power plants: Waste heat power generation units, standby synchronous generators safety protection
Distributed energy, biomass power plants, waste incineration power plants generator comprehensive protection and monitoring
Ship power stations, cogeneration units, emergency diesel power generation units relay protection measurement and control
Industrial plant self-owned substations synchronous generators, synchronous condensers protection, online temperature monitoring system
List of Similar Model Numbers
SR489-P1-HI-A20-E: CT secondary 1A current input, high-voltage power supply, 4-20mA output enhanced display version
SR489-P5-LO-A20: Low-voltage control power supply (20~60VDC), 5A current input standard version
SR489-P5-HI-A1: 0~1mA small-signal analog output basic model
SR489-P5-HI-A20: Standard LCD display version
SR489-P5-HI-A20-E: Enhanced large-screen LCD display version of this model
889 Series: GE's new generation compatible upgrade-type generator protection device, which can directly replace SR489 series GE Vernova
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