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GE SR489-P1-LO-A20-T generator management relay
Protection function:
Generator stator differential protection: High-speed double-slope differential protection is adopted to detect and eliminate stator phase faults. Advanced CT saturation detection algorithms provide additional supervision by using directional checks, ensuring that faults occur inside the generator before triggering tripping, thereby maintaining immunity to saturation states that may be caused by external disturbances.
100% stator grounding protection: Provided through an overvoltage element and an adaptive voltage difference function, which can respond to the third harmonic imbalance at the machine terminal and neutral point. The relay compares the neutral point voltage of the machine with the ground current to determine whether the ground fault occurs inside or outside the generator.
Backup phase distance protection: Equipped with two independent phase distance components, it can provide delayed backup protection for unresolved generator faults in the main system and generator protection. This distance characteristic can compensate for the unit delta/parallel power transformer located between the generator and the end of the protection area.
Sensitive directional power protection: Provides low forward power and reverse power components to prevent the generator from damaging the prime mover due to abnormal power conditions. Each component's alarm and trip have an independent power pickup level and operation delay setting.
Circuit breaker fault protection: The embedded circuit breaker fault function can enhance the reliability of the system. When a circuit breaker fault is detected, it can be configured to operate one of its four available digital outputs to send a signal to upstream equipment, thereby quickly isolating the fault.
Main advantages:
Comprehensive protection: It can provide comprehensive and safe protection for small and medium-sized generators.
Easy to use: Supported by the industry-leading software tool suite, it is convenient to operate.
Advanced monitoring function: Stator and bearing thermal protection can be achieved through RTD, and vibration monitoring can also be carried out through analog input.
Convenient maintenance: The drawer-type structure makes it easy to disassemble and install during daily maintenance, minimizing downtime to the greatest extent.
User-friendly interface: The large front panel interface is user-friendly, allowing for real-time power monitoring and set value access. The display is clear and easy to read even under direct sunlight.
Strong diagnostic ability: By using IRIG-B time synchronization event logging, waveform capture and data logger, the generator fault diagnosis ability has been enhanced. The built-in waveform simulation function can also be utilized to simplify the set point verification test.
Convenient communication: Information can be accessed economically and efficiently through industrial standard communication hardware (RS232, RS485, 10BaseT Ethernet) and protocols (Modbus RTU, Modbus TCP/IP, DNP 3.0).
Application scenarios:
Industrial self-owned power plants: They are used in cogeneration systems as protective devices for the main generator or backup generator to ensure the continuity of power supply for production (such as in metallurgy, petrochemicals, paper mills, etc.).
In the municipal and public welfare fields: Generators suitable for heating stations, water supply pumping stations, and sewage treatment plants ensure reliable start-up of backup power in case of mains power failure, thus avoiding interruption of public welfare services.
Small and medium-sized power generation scenarios: Suitable for synchronous or induction generators with a frequency of 25Hz/50Hz/60Hz, such as power supply for port cranes, power supply for mine hoisting equipment, independent power stations in remote areas, etc., serving as the main protection or backup protection equipment.
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