1. Product Description
The SR489-P5-LO-A20 GE is a member of the Multilin SR489 series, which are advanced generator protection relays. This SR489-P5-LO-A20 GE unit provides comprehensive protection, control, and advanced communication capabilities specifically designed for small and medium-sized generators. The SR489-P5-LO-A20 GE offers a cost-effective solution with industry-leading draw-out construction, facilitating easy maintenance and reduced downtime. It incorporates advanced protection features, including generator stator differential protection, and provides detailed diagnostic information to minimize troubleshooting time. The SR489-P5-LO-A20 GE is a key component in ensuring the secure and reliable operation of generators in various applications. The “LO” in the part number likely refers to a specific DC low voltage power input range.
2. Product Parameters
The specific parameters for the SR489-P5-LO-A20 GE can vary based on the exact configuration. However, typical parameters for the Multilin SR489 series include:
- Generator Type: Suitable for synchronous or induction generators operating at 25Hz, 50Hz, or 60Hz.
- Protection Features: Includes generator stator differential protection, thermal protection for stator and bearings (using RTDs), and potentially other protection elements like overcurrent, over/undervoltage, frequency protection, etc.
- Analog Inputs: May include analog inputs for vibration monitoring.
- Communication Interfaces: Typically equipped with standard communication hardware such as RS232, RS485, and potentially 10BaseT Ethernet ports.
- Communication Protocols: Supports industry-standard protocols like Modbus RTU, Modbus TCP/IP, and DNP 3.0 for seamless integration with control and monitoring systems.
- VT Ratio: 1.00 to 240.00:1 in steps of 0.01.
- VT Secondary: 200 V AC (full-scale).
- Conversion Range: 0.02 to 1.00 x Full Scale.
- Control Power: Likely supports a DC low voltage range, as indicated by “LO” (e.g., 24-60 VDC or 20-48 VDC).
- Mounting: Draw-out construction for easy installation and removal.
For detailed and precise technical specifications of the SR489-P5-LO-A20 GE, please refer to the specific product datasheet and manual from GE Vernova.
3. Advantages and Features
The SR489-P5-LO-A20 GE offers several key advantages and features for generator protection:
- Complete and Secure Protection: Provides comprehensive protection for small to medium-sized generators.
- User-Friendly Interface: Features a large, user-friendly front panel for easy operation and monitoring.
- Advanced Diagnostics: Includes IRIG-B time-synchronized event records, waveform capturing, and data loggers for enhanced troubleshooting.
- Simplified Testing: Built-in waveform simulation functionality simplifies setpoint verification testing.
- Cost-Effective Communication: Utilizes industry-standard communication hardware and protocols.
- Draw-Out Construction: Minimizes downtime and allows for easy removal and installation during maintenance.
- Harsh Environment Option: May have options available for operation in harsh chemical environments.
- Low DC Control Power: The “LO” designation suggests it’s designed for lower DC control power applications.
4. Application Areas and Application Cases
The SR489-P5-LO-A20 GE is primarily used for the protection of:
- Small to medium-sized synchronous generators.
- Induction generators.
- Generators in cogeneration applications (primary or backup protection).
- Applications with lower DC control power availability.
Application Case: In a remote power generation facility utilizing a 48 VDC battery system for control power, an SR489-P5-LO-A20 GE relay provides comprehensive protection for a 5 MVA synchronous generator. It monitors stator differential current, voltage, frequency, and temperature (using RTDs). In the event of a fault, such as an internal generator fault, the SR489-P5-LO-A20 GE quickly trips the generator’s circuit breaker, isolating it from the system. The event records and waveform capture features aid in post-fault analysis. The Modbus RTU communication allows the relay to interface with a local monitoring station.
