GE SR489-P5-LO-A1 Generator protection relay
GE SR489-P5-LO-A1 Technical Specification
Specification
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Attribute
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Detail
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Part Number
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SR489-P5-LO-A1
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Manufacturer
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General Electric (GE)
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Series
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Multilin™ SR
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Country of Origin
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USA
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Function
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Generator Protection Relay (Synch. Machine)
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Description
The GE SR489-P5-LO-A1 is an advanced generator protection relay for synchronous machines up to 600 MVA. It provides comprehensive fault detection (87G/40/46/32/51V), loss-of-field (40) protection, and breaker failure (50BF) logic. Includes synchrophasor measurement (IEEE C37.118), FlexLogic™ programmable functions, and 100% stator ground fault protection via 3rd harmonic neutral.
Features
- Core Protection Elements:
- Differential (87G), Restricted Earth Fault (64G)
- Negative Sequence (46), Reverse Power (32)
- Overexcitation (24), Field Ground (64F)
- Advanced Functions:
- Load Encroachment (-LO suffix logic)
- Breaker Failure (-P5 option)
- Sync-check (25) & Auto-synchronizer (25A)
- Monitoring & Analysis:
- Real-time phasors (ΔV/Δf/ΔØ measurements)
- Waveform capture (128 cycles @ 64 samples/cycle)
- Thermal capacity tracking (rotor/stator)
- Communications:
- Dual Ethernet (IEC 61850-8-1 GOOSE)
- RS-485 (Modbus RTU/DNP3.0)
- Front USB for EnerVista™ software
Electrical Specifications
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Parameter
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Specification
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Supply Voltage
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-A1 Suffix: 120V AC/DC (85–265V range)
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Current Inputs
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1A/5A nominal (0.1–50A continuous)
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Burden
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<0.15 VA per phase (5A)
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Relay Outputs
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8× Form-C contacts (5A @ 250V AC)
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Analog Inputs
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4× 4–20mA (rotor V/I, temp sensors)
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Operating Temp
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-40°C to +85°C (IEC 60068-2)
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Product Properties
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Property
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Specification
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Display
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240×128 graphical LCD with tactile keypad
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Enclosure
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IP52 metal casing (19″ rack mountable)
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Compliance
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IEC 60255, IEEE C37.90, NERC PRC-027
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Logic Programming
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25+ FlexLogic™ equations
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Event Records
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1024 time-tagged events + 64 oscillography files
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Dimensions
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177 × 132 × 158 mm (7.0 × 5.2 × 6.2 in)
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Weight
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2.1 kg (4.6 lbs)
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Performance Metrics
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Metric
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Value
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Differential Trip Time
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<15 ms (internal faults)
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Measurement Accuracy
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±0.1% V/I, ±0.01 Hz
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Synchrophasor Reporting
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30/60 frames/sec (CONFIG/FAST)
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Setting Groups
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4 (hot-switchable)
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Breaker Failure Delay
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0–10 sec (1 ms steps)
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Key Applications
- Power Generation:
- Turbine generators (gas/steam/hydro)
- Industrial cogeneration plants
- Grid Interconnection:
- Anti-islanding (81O/U) protection
- Automatic synchronization to grid
- Critical Infrastructure:
- Data centers (N+1 backup gensets)
- Offshore platforms (DNV-GL certified)
⚠️ Critical Integration Notes:
- CT Saturation: Use TPS-class CTs for 87G – ≤5% ratio error at 20×In.
- Neutral Grounding: 3rd harmonic stator ground requires high-Z NGR (>400Ω).
- LO Logic: Configure load boundaries using R-X diagram (avoid Zone 3 miscoordination).
- Breaker Failure Scheme: Requires 52a/b contacts for initiation.
- IEC 61850 Setup: Assign unique MAC/IP before energizing (defaults cause conflicts).
- Vibration Sensitivity: Mount away from switchgear >1.5m – false trips may occur.
- Firmware Alert: ≤V4.2 has known 51V timing bug – upgrade to V4.5+.
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