The GE SR489-P5-LO-A20 is a microprocessor-based motor protection relay from GE’s Multilin 489 series, engineered for critical rotating equipment protection in heavy industrial applications. Designed for motors up to 20MW, this advanced relay integrates 51-phase/ground overcurrent protection with thermal model tracking, vibration monitoring, and torque-controlled starting logic. The SR489-P5-LO-A20 variant specifically features 5A CT inputs and LO (Load Overload) thermal protection curves optimized for high-inertia centrifugal compressors.
As the flagship of GE’s Multilin 489 platform, this device combines 128-samples/cycle waveform capture with IEEE C37.118-compliant synchrophasor measurements. Its dual Ethernet ports support both IEC 61850 GOOSE messaging and Modbus TCP for seamless integration with DCS systems like GE Mark VIe. The GE SR489-P5-LO-A20 delivers <8ms fault detection latency, preventing cascade failures in oil & gas pipeline booster stations.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | SR489-P5-LO-A20 |
| Manufacturer | GE |
| Product Type | Motor Protection Relay |
| Input Voltage | 125VDC / 100-240VAC ±20% |
| Frequency | 50/60Hz ±10% |
| CT Input | 5A nominal (1A optional) |
| Protection Functions | Phase O/C, Ground O/C, Stall, Unbalance, Thermal Overload |
| Communication Protocols | IEC 61850, Modbus RTU/TCP, DNP3.0 |
| Operating Temp | -40°C to +70°C |
| Enclosure | IP40 (NEMA 1) |
| Dimensions | 177mm x 140mm x 155mm |
| Weight | 2.8kg |
| Certifications | UL 508, IEC 60255-27 |
Key Features and Advantages:
Adaptive thermal protection: The SR489-P5-LO-A20 employs real-time rotor thermal modeling with 10-step cooling curves, accurately predicting motor heating in variable torque applications like mine hoists. Its dynamic unbalance protection triggers at 5% current asymmetry, preventing bearing damage in paper mill dryer sections.
High-resolution diagnostics: Captures 128 cycles of pre/post-fault waveforms at 4kHz sampling rate, enabling precise root cause analysis for refinery pump trips. The 5.7″ color touchscreen displays real-time torque-speed curves during motor starts, with zoomable trending for 32 analog parameters.
Cyber-secure architecture: Features role-based access control compliant with NERC CIP-007 and secure firmware validation via SHA-256 hashing. The relay’s dual independent Ethernet interfaces maintain <2ms peer-to-peer GOOSE messaging for load shedding coordination across power plants.
Application Areas:
The GE SR489-P5-LO-A20 is essential in:
- Power Generation: Protecting 16-pole induced draft fans in coal-fired plants
- Petrochemical: Monitoring reciprocating compressor crankcase vibrations
- Water Treatment: Controlling soft-start sequences for 10kV raw water pumps
- Metals Processing: Detecting broken rotor bars in 18MW rolling mill motors
In LNG liquefaction trains, this relay prevents under-voltage cascades during gas turbine load rejection. Cement plants utilize its motor start inhibit logic to block energization during excessive gearbox temperature conditions. The device’s <0.5% torque measurement accuracy ensures precise load sharing in parallel compressor installations.
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Installation and Maintenance:
Installation preparation: Verify CT saturation characteristics (10P20/5A recommended) before connecting to SR489-P5-LO-A20. Use shielded Belden 9501 twisted-pair cables for analog inputs in steel mill environments.
Maintenance recommendations: Perform annual contact resistance tests on output relays using GE’s Enervista UR Setup software. Replace front-panel membrane every 5 years in chemical plants. Calibrate thermal models after motor rewinds using embedded IEEE 841-based algorithms.
Product Assurance:
HONG KONG SAUL ELECTRICAL LIMITED provides 12-month extended warranty for SR489-P5-LO-A20 units, including free configuration file recovery services. All relays undergo 1000-cycle contact endurance testing and 72-hour burn-in at 85°C ambient temperature. Our NETA-certified technicians offer 24/7 remote support via GE’s Proficy Historian data lakes. Each unit includes complete IEC 60255 test reports and NEMA MG-1 compliance certificates.
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