GE Multilin 489 Generator Protection System SR Series Relays

The Multilin™ 489 Generator Protection System is a member of the SR Series of relays that provides protection, control, and advanced communications in an industry-leading drawout configuration.

Designed for small to medium sized generators, the 489 offers advanced protection features, including generator stator differential protection. 489 also includes detailed diagnostic information to reduce troubleshooting time.

Key Benefits

- Comprehensive, safe protection for small and medium-sized generators

- Easy-to-use generator protection system supported by an industry-leading suite of software tools.

- Advanced protection and monitoring features, including stator and bearing thermal protection using RTDs and vibration monitoring using analogue inputs

- Globally recognised as a member of the most prestigious relay protection product family on the market

- Drawer construction to minimise downtime and facilitate removal/installation during routine maintenance 489

- Large, user-friendly front panel interface for real-time power monitoring and setpoint access, with a display that is easy to read in direct sunlight

- Enhanced generator troubleshooting capabilities through the use of IRIG-B time-synchronised event logging, waveform capture and data logger

- Simplifies setpoint verification testing with built-in waveform simulation capabilities

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

- Can be used in most extreme locations by offering harsh chemical environment options

Applications

- Synchronous or induction generators operating at 25Hz, 50Hz or 60Hz

- Primary or backup protection in cogeneration applications

Protection and control

The 489 generator protection system provides comprehensive protection, metering and monitoring functions,

The 489 generator protection system provides comprehensive protection, metering and monitoring functions for small and medium-sized synchronous or induction generators operating at 25. 50 or 60 Hz.

The 489 is ideal for primary or standby generator protection as well as cogeneration applications.

The 489's protection features include:

Generator stator differential

The 489 uses high speed dual slope differential protection to detect and clear stator phase faults.

Stator phase faults. Advanced CT saturation detection algorithms provide additional supervision through the use of directional checks that

ensures that the fault occurs inside the generator before triggering a trip, thus maintaining immunity to saturation that may be caused by external disturbances.

100% Stator Ground

100% stator ground fault protection is provided by an overvoltage element and an adaptive differential voltage function that responds to third harmonic imbalances at the machine terminals and neutral.

The 489 will compare the machine neutral voltage with the grounding current to determine if the ground fault is internal or external to the generator.

Alternate Phase Distance

Two independent phase distance elements provide time-delayed backup protection for generator faults that are not cleared by the main system and generator protection.

This distance characteristic compensates for unit delta/shunt power transformers located between the generator and the end of the protection zone.

Sensitive Directional Power

The 489 provides low forward and reverse power elements to prevent generator

movement from damaging the prime mover. Each element has separate power pickup level and operating delay settings for alarms and trips.

Circuit Breaker Faults

The embedded circuit breaker fault feature in the 489 improves system reliability without the additional cost of providing a separate circuit breaker fault relay.

When a circuit breaker fault is detected, the 489 can be configured to operate one of its four available digital outputs to signal upstream equipment to quickly isolate the fault.