GE SR489-P5-HI-A20-E Management Relay Enhanced Display
Manufacturer: GE Fanuc
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Part Number: SR489-P5-HI-A20
Condition：New with Original Package
Product Type: Generator Management Relay
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Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Product Overview
The SR489-P5-HI-A20-E (also known as 489-P5-HI-A20-E) is an authoritative Generator Management Relay from the GE Multilin SR489 series. This module is a mechanical necessity for the advanced protection, monitoring, and control of medium to large synchronous generators. By integrating high-speed digital signal processing with a comprehensive protection suite—including differential, overcurrent, and loss of excitation logic—the SR489-P5-HI-A20-E ensures deterministic operation and equipment longevity. Featuring an enhanced LCD display for real-time field visibility and 4–20 mA analog outputs for seamless PLC/DCS integration, this relay is a trustworthy standard in utility-scale power plants and heavy industrial co-generation facilities.
Detailed Technical Specifications
| Attribute | Details |
| Manufacturer | GE Multilin / General Electric |
| Model Number | SR489-P5-HI-A20 |
| Ordering Code | 489-P5-HI-A20-E |
| Series | SR489 Generator Management System |
| Product Type | Generator Protection and Control Relay |
| Phase Current Inputs (P5) | 5 A Phase CT Secondaries |
| Control Power (HI) | High Range: 90–300 VDC or 70–265 VAC (48–62 Hz) |
| Analog Outputs (A20) | 4 Isolated 4–20 mA Analog Outputs |
| Display Type (E) | Enhanced Display (Larger LCD for better visibility) |
| Primary Function | Protection for synchronous generators and prime movers |
| Communication | RS485, RS232, Modbus RTU, DNP 3.0 (Ethernet optional) |
| Operating Temp | -40 °C to +70 °C (-40 °F to 158 °F) |
| Shipping Weight | 12 kg (Full assembly and packaging) |
| Certifications | CE, UL, IEC compliance |
Engineering and Operational Guidelines
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Synchronous Protection Expertise: The SR489-P5-HI-A20-E excels at detecting complex generator faults. Its expertise in reverse power, over/under excitation (loss of field), and frequency monitoring prevents mechanical damage to the turbine-generator shaft and electrical damage to the windings.
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Deterministic Signal Logic: A trustworthy feature of this relay is its 100% stator ground fault protection (using third harmonic neutral undervoltage logic). This ensures that even faults occurring near the generator neutral are detected before they evolve into catastrophic phase-to-phase failures.
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Authoritative Diagnostics: Integrated hardware supports high-resolution oscillography and event recording. In the event of a trip, the 489-P5-HI-A20-E captures waveform data that allows protection engineers to conduct root cause analysis and distinguish between genuine faults and system transients.
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System Visibility: The "E" version includes an enhanced LCD interface. This authoritative display provides clear, multi-line navigation for local metering of volts, amps, watts, vars, and frequency, facilitating rapid onsite commissioning and maintenance.
Technical FAQ
Q: What is the difference between the P1 and P5 current input options?
A: The P5 designation in the SR489-P5-HI-A20-E indicates the relay is hardware-configured for 5A CT secondaries. If your field CTs provide a 1A output, you must use the P1 model. Professional best practice dictates matching the relay hardware to the CT ratio to ensure metering accuracy.
Q: Can the 4-20 mA analog outputs be used for control?
A: Yes. The A20 option provides four programmable 4–20 mA outputs. These are typically mapped to parameters like generator MW or MVAR to provide real-time feedback to a PLC or DCS for automated load management or governor control.
Q: Is the SR489-P5-HI-A20-E suitable for high-vibration environments?
A: Yes. The SR489 series is designed for industrial grade durability. However, it is an engineering requirement to ensure the relay is mounted in a standard 19-inch rack or panel cutout that meets the vibration specifications of the turbine hall.