GE SR489-P5-HI-A20-E generator protection relay
Product Description
The GE SR489-P5-HI-A20-E is a microprocessor-based generator protection relay designed for comprehensive monitoring, control, and safeguarding of synchronous generators (5–1500 MVA). It integrates advanced algorithms for fault detection, differential protection, and system stability management in utility, industrial, and renewable energy applications.
Product Parameters & Specifications
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Parameter Category
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Specification
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Manufacturer/Series
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GE Grid Solutions / Multilin SR Series
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Model Code
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SR489-P5-HI-A20-E
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Protection Functions
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High-Impedance Differential (HI)
Loss-of-Field (40) Reverse Power (32) Over/Under Voltage (27/59) Over/Under Frequency (81O/U) Stator Ground Fault (64G) Out-of-Step (78) Negative Sequence (46) |
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Input Ratings
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AC Current: 1A or 5A (configurable)
AC Voltage: 120/240V phase-to-phase DC Auxiliary: 48–250VDC (P5 suffix) |
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Control I/O
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16x Programmable Logic Inputs
10x Form-C Output Relays (A20 suffix) |
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Communication
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Ethernet (E suffix): IEC 61850, Modbus TCP
Serial: RS485 (Modbus RTU), RS232 Protocols: DNP 3.0, IEC 60870-5-103/104 |
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Measurement Accuracy
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Current/Voltage: ±0.5% of reading
Frequency: ±0.01 Hz |
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Operating Temp
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-40°C to +85°C (IEC 60068-2)
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Standards Compliance
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IEC 60255, 61000-4 (P5 suffix)
IEEE C37.90, C37.94 UL 508, CE |
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Oscillography
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128 cycles @ 64 samples/cycle
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Display/HMI
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4-line LCD with LED status indicators
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Mounting
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Panel-mounted (1/4 19″ rack)
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Key Features
- High-Impedance Differential Protection (HI): Ultra-sensitive fault detection for stator windings.
- Adaptive Protection Logic: Programmable FlexLogic™ for custom control sequences.
- Synchrophasor Measurement: IEEE C37.118-compliant PMU functionality.
- Oscillographic Recording: 64-sample/cycle fault waveform capture.
- Cyber Security: Role-based access control, IEC 62351 encryption.
- PLC Integration: IEC 61131-3 compliant scripting.
- RTD/Thermocouple Inputs: Winding/bearing temperature monitoring.
Function & Role
- Primary Protection: Detects stator/rotor faults, loss-of-excitation, overfluxing.
- System Stability: Prevents out-of-step operation and islanding.
- Load Management: Enforces underfrequency load shedding (UFLS).
- Diagnostics: Tracks harmonic distortion, power quality, and event sequences.
- Control Automation: Interfaces with AVRs (Automatic Voltage Regulators) and governor systems.
Typical Applications
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Application Field
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Use Case
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Power Generation
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Gas/coal-fired plants, hydroelectric turbines
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Industrial Plants
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Cogeneration (CHP), critical process backup
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Renewable Energy
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Wind/solar farm collector systems
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Marine & Offshore
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Shipboard power management
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District Heating
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Biomass generator protection
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Data Centers
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Mission-critical UPS integration
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Industry-Specific Roles
- Utility Power Plants:
- Prevents generator damage during grid faults (e.g., phase-to-phase shorts).
- Monitors VAR flow for grid code compliance.
- Petrochemical Facilities:
- Isolates generators during underfrequency events to avoid cascade tripping.
- Wind Farms:
- Protects doubly-fed induction generators (DFIGs) from transient overvoltage.
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