GE Multilin 489-P5-HI-A20 Generator Protection Relay
The GE Multilin 489-P5-HI-A20 is a digital generator management relay designed for protection, monitoring, and control of small- to medium-sized generators in industrial and utility power systems. It integrates multiple protection functions, metering, communications, and diagnostics in a single draw-out relay.
Overview
The 489 series is widely used to protect generators from electrical faults, abnormal operating conditions, and thermal stress while providing real-time monitoring and communications.
Typical applications
- Industrial power plants
- Cogeneration facilities
- Marine/offshore generators
- Utility backup generators
Model Code Breakdown
489-P5-HI-A20
| Code | Meaning |
|---|---|
| 489 | Generator Management Relay series |
| P5 | 5A CT secondary inputs |
| HI | High-range control power (90–300 VDC / 70–265 VAC) |
| A20 | 4–20 mA analog outputs |
This decoding aligns with GE Multilin ordering logic for the 489 family.
Key Functions
Generator Protection
Provides comprehensive protection including:
- Stator differential & stator ground protection
- Loss of excitation protection (impedance-based)
- Reverse power protection
- Over/under voltage & frequency
- Phase & ground overcurrent
- Breaker failure detection
- Trip coil supervision
These functions help prevent damage from faults and abnormal conditions.
Monitoring & Diagnostics
The relay also acts as a monitoring system:
- Metering and event recording
- 12 RTD thermal inputs (generator temperature monitoring)
- Vibration monitoring via analog inputs
- Fault and alarm recording
- Simulation and testing features
Communications & Integration
Supports integration into modern SCADA/DCS systems:
- RS232 and RS485 communications
- 10Base-T Ethernet
- Protocols: Modbus RTU/TCP, DNP3
- PC configuration via EnerVista 489 software
Key Technical Specifications
Electrical
- Control power: 90–300 VDC / 70–265 VAC (48–62 Hz)
- CT inputs: 5A secondary
- Analog outputs: 4–20 mA
- Output relays: 6 Form-C contacts (10A)
Measurement & Accuracy
- Current accuracy: ±0.5% (<2×CT)
- Voltage accuracy: ±0.5% full scale
Environmental
- Operating temperature: −40°C to +60°C
- Humidity: up to 95% non-condensing
Design Advantages
- Draw-out case design → easy maintenance
- Integrated protection + monitoring → reduces panel space
- Sunlight-readable display for local operation
- Reliable operation in harsh industrial environments
Summary
The GE 489-P5-HI-A20 is a proven generator protection relay combining protection, control, monitoring, and communications in one platform. It is ideal for facilities needing dependable generator protection with industrial-grade reliability and integration capability.
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