中文版
Description
Technical Specifications
| Product Model | **GE SR489 489-P5-HI-A20** |
| Manufacturer | General Electric (GE) |
| Product Type | Generator Protection Relay (Multilin Series) |
| Input Voltage | 100-240 VAC/VDC (Dual-rated) |
| Current Inputs | 5A or 1A CTs (Programmable) |
| Protection Functions | 87G (Generator Differential), 27/59 (Under/Overvoltage), 81 (Overfrequency/Underfrequency), 46 (Negative Sequence), 50/51 (Overcurrent) |
| Communication | Modbus RTU, DNP3.0, Ethernet (Optional) |
| Relay Outputs | 6 Form-C Contacts (5A @ 250VAC) |
| Operating Temperature | -40°C to 70°C |
| Certifications | UL 508, IEC 60255, IEEE C37.90 (EMI Immunity) |
SR489-P5-HI-A20-E
Key Features & Advantages
The **GE SR489 489-P5-HI-A20** is a high-impedance differential relay (87G) designed for generator stator protection. Its 2nd/5th harmonic blocking prevents false trips during transformer inrush or overexcitation. The relay includes a 1A/5A auto-ranging CT input with ±0.5% accuracy for precise fault detection. Dynamic CT saturation detection ensures reliability during asymmetrical faults.
Advanced metering: Provides real-time synchrophasors (PMU) for grid stability monitoring. The 256-event oscillographic recorder captures pre-/post-fault waveforms for root-cause analysis. GE’s EnerVista SR software simplifies settings management with adaptive logic and GOOSE messaging support for IEC 61850 systems.
Applications
Critical for **power plant generators** (10-500 MVA) to detect stator ground faults and phase imbalances. Used in **industrial cogeneration systems** to protect gas turbines from internal short circuits. **Hydroelectric plants** leverage its frequency ride-through capability during grid disturbances. Also deployed in **data center backup generators** and **marine propulsion motor protection**.
Related Products
**SR750 Feeder Protection Relay**.
**Multilin 869 Motor Protection Relay**.
**F60 UR Generator Management Relay**.
**C30 Capacitor Bank Protection**.
**B30 Bus Differential System**.
**EX2100 Excitation Control**.
Installation & Maintenance
**Installation**: Use shielded twisted-pair wiring for CT circuits. Ensure CT polarity matches relay labeling. Configure grounding via the relay’s CT shorting terminal block. **Testing**: Perform primary injection testing annually using Omicron CMC 356. Verify slope characteristics (10-50% adjustable) during commissioning. **Maintenance**: Update firmware via EnerVista using USB or Ethernet. Replace backup lithium battery (CR2032) every 5 years.
Product Assurance
The SR489 undergoes 50g shock and 5g vibration testing per IEC 60255. Includes a 3-year warranty with 10-year hardware support lifecycle. Complies with NERC PRC-025-2 for generator protection. GE’s Grid Solutions provides relay coordination studies and arc-flash analysis. Documentation includes ANSI C37.90.1-compliant test plans and SELogic configuration examples.
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