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SR489-P5-HI-A20-E GE new and in stock

$543.00

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Description

Multilin™ 489 Generator Protection System Overview

As a key member of the SR relay family, the Multilin™ 489 Generator Protection System integrates protection, control, and advanced communication capabilities into a cost-effective, industry-leading draw-out design. Tailored for small and medium-sized generators, it delivers advanced protection functions—including generator stator differential protection—and provides detailed diagnostic data to minimize troubleshooting time.

Key Benefits

Comprehensive, Reliable Protection: Ensures secure operation of small to medium-sized generators against electrical faults and abnormal conditions.
User-Friendly Operation: Supported by an industry-leading suite of software tools, simplifying setup, monitoring, and maintenance.
Advanced Protection & Monitoring: Incorporates RTD (Resistance Temperature Detector) inputs for stator and bearing thermal protection, plus analog inputs for vibration monitoring—enhancing real-time equipment health oversight.
Global Industry Recognition: Leverages the reputation of the SR relay family, one of the most renowned protection relay product lines in the market, ensuring broad acceptance across regions and applications.
Draw-Out Construction: Enables quick removal and reinstallation during maintenance, significantly reducing downtime for generator systems.
Intuitive Front Panel Interface: Features a large, sunlight-readable display for real-time power monitoring and easy access to setpoints, ensuring visibility and operability in harsh lighting conditions.
Enhanced Troubleshooting: Equipped with IRIG-B time-synchronized event records, waveform capture, and data loggers—providing precise, time-stamped data to accelerate root-cause analysis of issues.
Simplified Setpoint Testing: Built-in waveform simulation functionality streamlines verification of protection setpoints, eliminating the need for external test equipment in many cases.
Cost-Effective Data Access: Supports industry-standard communication hardware (RS232, RS485, 10BaseT Ethernet) and protocols (Modbus RTU, Modbus TCP/IP, DNP 3.0), enabling seamless integration with existing control systems without excessive upgrades.
Harsh Environment Compatibility: An optional Harsh Chemical Environment package allows deployment in most extreme industrial settings, expanding its application scope.

Core Protection & Monitoring Capabilities

1. Stator Differential Protection

The 489 employs high-speed dual-slope differential protection to detect and clear stator phase faults rapidly. It also integrates advanced CT (Current Transformer) saturation detection algorithms: these algorithms use a directional check to remain immune to saturation caused by external disturbances. This additional supervision ensures the relay only triggers a trip if the fault is confirmed to be internal to the generator—preventing false trips and ensuring reliable operation.

2. Power Protection (Forward & Reverse Power)

To prevent generator motoring (a condition that can damage the prime mover), the 489 includes low forward power and reverse power elements. For each element, independent settings are available for power pickup thresholds and operational delays—supporting both alarm activation (for early warning) and trip initiation (for critical fault mitigation).

3. Frequency Protection

Operation of generators at off-nominal frequencies poses severe risks to both the generator and its associated prime mover (particularly steam turbine generators operating below normal frequency). The 489 addresses this with overfrequency and underfrequency protection elements. It features configurable alarm levels to alert operators of abnormal frequency conditions, plus multiple trip levels—each with independent tripping delay settings tailored to different magnitudes of frequency deviation.