GE SR489-P5-HI-A20-E Generator Protection System

GE SR489-P5-HI-A20-E Generator Protection System

DESCRIPTION

The Multilin™ 489 Generator Protection System, a member of the SR family of relays, provides protection, control and advanced communications in a cost effective industry leading draw-out construction. Designed for small and medium sized generators, the 489 delivers advanced protection including generator stator differential protection. The 489 also includes detailed diagnostic information allowing for reduced troubleshooting time

BENEFITS

 • Complete, secure protection of small to medium sized generators 

 • Easy to use generator protection system supported by and industry leading suite of software tools. 

 • Advanced protection and monitoring features including the use of RTDs for stator and bearing thermal protection and Analog Inputs for vibration monitoring 

 • Global acceptance as a member of the most renown protection relay product family in the market. 

 • Draw-out construction allowing for minimized downtime and easy removal/installation of the 489 during maintenance routines 

 • Large, user-friendly front panel interface allowing for real-time power monitoring and setpoint access with a display that is easily readable in direct sunlight 

 • Enhanced generator troubleshooting through the use of IRIG-B time synchronized event records, waveform capturing, and data loggers 

 • Simplified setpoint verification testing using built in waveform simulation functionality 

 • Cost effective access to information through industry standard communication hardware (RS232, RS485, 10BaseT Ethernet) and protocols (Modbus RTU, Modbus TCP/IP, DNP 3.0) 

 • Available for use in most extreme harsh locations with the available Harsh Chemical Environment Option

Monitoring & Metering

• Metering – current, voltage, power, Energy, frequency, power factor 

 • Demand – current, watts, vars, VA 

 • Temperature – 12 RTD inputs 

 • Vibration and Speed – 4 analog transducer inputs 

 • Oscillography – 12 samples/ cycle up to 128 cycles in length 

 • Trending – 8 parameters with up to a 5 second sample rate

EnerVista Software

• Document and software archiving toolset to keep information up to date 

• Ease to use real time monitoring, control, and data archiving software available 

• EnerVista Integrator providing easy integration of data in the 489 into new or existing monitoring and control systems

Protection and Control

The 489 Generator Protection System provides comprehensive protection, metering, and monitoring of small to medium sized synchronous or induction generators operating at 25, 50 or 60 Hz. The 489 is ideally suited for primary or backup generator protection as well as for use in cogeneration applications. Protection features found in the 489 include:

Generator Stator Differential

The 489 utilizes high-speed dual slope differential protection for detecting and clearing of stator phase faults. Advanced CT saturation detection algorithms maintain immunity to saturation conditions that may be caused due to external disturbances through the use of a directional check that provides additional supervision and ensures the fault is internal to the generator before triggering it to trip.

100% Stator Ground

100% stator ground fault protection is provided through an overvoltage element and an adaptive voltage differential feature responding to the unbalance of the third harmonic at the machine terminals and at the neutral point. The 489 compares the machine neutral voltage and ground current to determine if ground directional faults are within or outside the generator.

Backup Phase Distance

Two separate phase distance elements provide time-delayed backup protection for generator faults that have not otherwise been cleared by the primary system and generator protections. The distance characteristic can compensate for a unit delta/wye power transformer that is located between the generator and the end of the zone of protection.

Sensitive Directional Power

The 489 provides low forward power and reverse power elements to prevent generator motoring that can cause damage the prime mover. Independent settings for power pickup levels and operational delays are available for both alarming and tripping of each element.

Breaker Failure

The embedded breaker failure function in the 489 allows for improved system dependability without the additional cost of providing an independent breaker failure relay. Upon detection of a breaker failure condition, the 489 can be configured to operate one of its 4 available digital outputs to signal upstream devices to quickly isolate the fault.

Loss of Excitation

Generator loss of excitation protection is provided through two negative offset mho characteristics as per IEEEC37.102 and has independent pickup delay setting for each characteristic. The loss of excitation element will be blocked from tripping if a VT fuse fail condition is detected or if the Voltage Supervision characteristic is enable and the voltage is measured to be above the user defined level.

Abnormal Frequency Protection

Operation of generators at off-nominal frequencies can have extremely detrimental effects on both the generator itself and the associated prime mover, in particular with steam turbine generators operating below normal frequency. The 489 provides overfrequency and underfrequency elements needed to provide protection of generators from operation at off-nominal frequencies. The 489 has alarm level settings to alert operations of abnormal frequency conditions as well as multiple trip levels that have independent tripping delay settings for each magnitude of abnormal frequency detected.