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GE SR489-P5-LO-A20 – Multilin Generator Management Protection Relay
Product Overview
The GE SR489-P5-LO-A20 is a microprocessor-based generator management relay from GE Multilin SR489 series. It delivers integrated protection, monitoring and control for synchronous and induction generators in power generation systems. This unit solves critical issues including overcurrent, under/over voltage, frequency deviation and negative sequence fault detection. It supports 5A CT secondary inputs, wide-range power supply and multiple communication protocols, widely used in power plants, CHP stations and industrial self-generation systems. The device provides fast fault response and accurate parameter measurement to ensure safe and stable generator operation under complex grid conditions.
Technical Specifications — GE SR489-P5-LO-A20
| Parameter | Value |
|---|---|
| Product Model | GE SR489-P5-LO-A20 |
| Manufacturer | General Electric Multilin |
| Product Type | Generator Management Protection Relay |
| Power | 20–60 Vdc / 20–48 Vac, 48–62 Hz |
| Communication / Protocol | Modbus RTU, DNP3.0, RS485 |
| Operating Temperature | -40 °C to +70 °C |
| Mounting | Panel flush mounting, drawout chassis |
| Dimensions (HxWxD) | 216 mm × 224 mm × 252 mm |
| Weight | 2.27 kg |
| Typical Interfaces | 5A phase CT inputs, 8×4–20mA analog outputs, configurable digital I/O, RTD inputs |
| Compliance | IEC 61850, ANSI protection standards, NERC compliant |
GE SR489-P5-LO-A20
Key Features and Benefits — GE SR489-P5-LO-A20
- Comprehensive protection logic: Integrates overcurrent, over/under voltage, frequency, negative sequence and differential protection functions.
- High precision control: ±1% measurement accuracy and 1ms event resolution for rapid transient fault detection.
- Optical isolation design: Effectively suppresses electromagnetic interference and ensures signal stability.
- Programmable parameters: Adjustable time-delay settings and flexible logic configuration for customized generator protection schemes.
- Drawout hot-swap structure: Equipped with automatic CT short-circuit function, enabling maintenance without system shutdown.
Related Models
- GE SR489-P6-LO-A20: 1A CT secondary version generator management relay, compatible with SR489-P5-LO-A20 system architecture.
- GE SR489-P5-LO-A20-E: Enhanced Ethernet communication edition of the base generator protection relay.
- GE F650: Medium voltage feeder protection relay, matching SR489 series for full power system protection.
- GE UR Series Relay: Universal modular protection relay, applicable to transformer and busbar protection matching this unit.
Installation and Maintenance — GE SR489-P5-LO-A20
- Installation: Adopt panel flush mounting; correctly wire CT/PT loops and control power, confirm automatic CT short-circuit function activates before insertion.
- Routine maintenance: Regularly check terminal tightness, calibrate measurement accuracy and clean internal dust every 6 months.
- Troubleshooting: Use front LCD display and event records to locate faults; configure parameters via USB or RS485 port without power-off.
- Compliance: Periodically verify protection logic and calibration status to meet power industry safety and NERC regulatory requirements.
