SR489-P5-LO-A20-E | GE Electric Relay protection device
Product Description
The GE SR489-P5-LO-A20-E is a microprocessor-based relay designed for comprehensive protection, control, and monitoring of synchronous motors. It safeguards motors against electrical faults (e.g., overcurrent, loss of excitation, out-of-step conditions) and provides advanced diagnostics, event recording, and communication capabilities. Ideal for critical industrial applications, it ensures motor reliability, minimizes downtime, and integrates seamlessly with control systems via multiple protocols.
Key Features
- Multi-Function Protection: Overcurrent, overload, stator ground fault, loss of excitation, out-of-step, under/overvoltage, and negative sequence.
- Advanced Monitoring: Real-time measurement of current, voltage, power, frequency, and rotor temperature.
- Programmable Logic: Customizable control sequences via FlexLogic™.
- Communications: Dual Ethernet, Modbus, and DNP3.0 protocols for SCADA integration.
- Event Recording: 64 oscillographic fault records and 2,000 time-stamped event logs.
- User Interface: Intuitive LCD display with push-button navigation.
Product Specifications
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Parameter
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Specification
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Input Ratings
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0.2–10 A (phase CT), 50/60 Hz
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Voltage Input
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20–300 V AC (phase/auxiliary)
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Protection Functions
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Overcurrent, ground fault, loss of excitation, out-of-step, thermal overload
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Control Power
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48–250 V DC/AC
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Communication
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Ethernet (2 ports), RS485 (Modbus RTU/DNP3.0)
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Operating Temperature
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-40°C to +85°C (-40°F to +185°F)
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Enclosure
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EIA RS-310 19″ rack-mount (5U height)
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Certifications
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UL 508, CE, IEC 60255
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Series Overview
Part of the GE Multilin™ SR Series, the SR489 models specialize in synchronous motor protection. The -P5-LO-A20-E variant includes:
- -P5: Phase current inputs (5A nominal).
- -LO: Loss of excitation protection enabled.
- -A20: Auxiliary voltage input (20–300V).
- -E: Ethernet communication support.
Applications
- Industrial Motors: Protection for large synchronous motors in compressors, pumps, and fans.
- Energy Sector: Oil/gas extraction, power generation, and mining operations.
- Water Treatment: Critical pump motor protection.
- Manufacturing: High-inertia machinery requiring precise synchronization.
Functional Role
The SR489-P5-LO-A20-E detects abnormal operating conditions (e.g., voltage instability, rotor faults) and isolates motors before damage occurs. It prevents catastrophic failures by triggering alarms, initiating shutdowns, or enabling auto-restart sequences. Continuous monitoring aids predictive maintenance, extending motor lifespan.
Why Choose the SR489?
- Reliability: Robust protection for motors up to 20 kV.
- Flexibility: Customizable settings for diverse motor types.
- Integration: Seamless connectivity to SCADA, PLCs, and HMIs.
- Compliance: Meets global standards for industrial safety (IEC, IEEE, ANSI).
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