GE Multilin SR489 Series Generator Protection Relay
Model: SR489-P5-L0-A20-E
Hardware Revision: H (2023)
Firmware: v8.3x (IEC 61850 Ed2.0 compliant)
Core Protection Functions
| Function | IEEE Std | Setting Range | Accuracy |
|---|---|---|---|
| Loss of Excitation (40) | C37.102 | 0.5-5.0A (CT secondary) | ±1% FS |
| Reverse Power (32) | C37.106 | 0.1-10.0% Prated | ±0.5% |
| Stator Ground Fault (64G) | C37.101 | 5-2000Ω (3I₀ method) | ±2% + 10mΩ |
| Overfrequency (81O) | C37.117 | 45-75Hz (0.01Hz step) | ±0.001Hz |
| Differential (87G) | C37.233 | 5-50% slope | ±3% |
Electrical Specifications
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[Inputs]
- Voltage: 3× 120/480V AC (0.1-1.5Un continuous)
- Current: 3× 1A/5A AC (0.05-30In, 100In/1s)
- Aux Supply: 48-250V DC/AC (85-300VDC surge)
[Outputs]
- Contacts: 7× Form-C (8A @ 250V AC, 100k ops)
- Analog: 4× 0-1mA/4-20mA (16-bit resolution)
- Communication:
• Dual Ethernet (IEC 61850-8-1 GOOSE)
• RS485 Modbus RTU
Model Suffix Decoding
| Code | Feature | Specification |
|---|---|---|
| P5 | Power Supply | 125V DC/110V AC |
| L0 | HMI | LCD + 9 LEDs (no keypad) |
| A20 | I/O Configuration | 7 relay outputs + 12 DI |
| E | Enclosure | 19″ rack mount (4U height) |
Performance Metrics
| Parameter | Value | Standard |
|---|---|---|
| Operating Temp | -40°C to +85°C | IEC 60068-2-1/2 |
| Trip Time (Typical) | ≤1.5 cycles (87G) | IEEE C37.90.1 |
| Fault Recorder | 128 cycles @ 512 samples/cycle | COMTRADE Rev 1999 |
| SOE Resolution | 0.33ms | IEC 61850-5 Class 1 |
Certifications & Compliance
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Safety:
- UL 508 (Industrial Control Equipment)
- IEC 60255-27 (HV Testing: 2.5kV RMS 1min)
EMC:
- IEC 61000-4-5 (8kV surge immunity)
- IEC 61000-4-8 (300A/m magnetic field)
Grid Codes:
- NERC PRC-019-2 (Generator Protection)
- IEC 60255-149 (Synchrophasors)
Configuration Warnings
Critical Settings Constraints
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# For Loss of Excitation (40):
Z_offset ≤ 0.85 * Xd' # Must satisfy
Time_Delay ≥ Generator_Inertia_Constant
# Differential (87G) Slope:
Slope_2 ≥ 1.5 × Slope_1 # Mandatory ratio
CT Saturation Prevention
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Min CT Class: C400 (ANSI) / 5P20 (IEC)
Knee Point: Vₖ ≥ 0.5 × Iₛₛ × (Rct + 2Rₗ)
Cybersecurity Features
- Role-Based Access: 9 privilege levels (IEC 62351-8)
- Secure Protocols:
• TLS 1.2 (61850 MMS)
• MAC-secured GOOSE - Audit Trail: Non-volatile event logging (10k entries)
SR489-P5-L0-A20-E GE PDF
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