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- GE
- SR489-P5-HI-A20-E
- Generator Management Relay
- USA
- 252 × 216 × 224 mm
- 7.7 kg
- Xiamen, China
- New & In Stock
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Product Overview
The GE SR489-P5-HI-A20-E Generator Management Relay belongs to the GE Multilin 489 generator protection and management family. It combines generator electrical protection, metering, temperature monitoring, alarm handling and trip control in a dedicated relay package. It is used in generator control panels where electrical measurements and abnormal operating conditions must be evaluated against configured protection settings.
This configuration includes 5 A phase current transformer inputs, a high-range control power supply, 4–20 mA analog outputs and an enhanced local display. The high-range supply accepts 90–300 V DC or 70–265 V AC at 48–62 Hz. The enhanced display provides a larger LCD and improved keypad for viewing relay measurements, status and settings.
The relay processes current, voltage and connected condition-monitoring signals, then operates assigned trip or alarm outputs when configured protection criteria are met. Serial communications and analog outputs support connection to compatible supervisory equipment, allowing generator status and selected operating measurements to be incorporated into a wider plant monitoring system.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | GE |
| Model / Order Number | SR489-P5-HI-A20-E |
| Product Family | GE Multilin 489 |
| Product Type | Generator Management Relay |
| Phase CT Input Rating | 5 A |
| Control Power Option | HI |
| DC Control Power Input | 90–300 V DC |
| AC Control Power Input | 70–265 V AC |
| AC Control Power Frequency | 48–62 Hz |
| Analog Output Option | A20 |
| Analog Output Range | 4–20 mA |
| Display Option | Enhanced display with larger LCD and improved keypad |
| Digital Inputs | 9 opto-isolated inputs |
| RTD Monitoring | Supports up to 12 RTD inputs |
| Communication Interfaces | RS232 and RS485 |
| Communication Protocols | Modbus RTU, DNP 3.0 |
| Protection Functions | Configurable generator electrical and thermal protection |
| Enclosure / Mounting Format | Drawout relay package |
| Dimensions | 252 × 216 × 224 mm |
| Weight | 7.7 kg |
Product Features
- Generator protection: Supports configurable protection functions for electrical faults and abnormal generator operating conditions.
- 5 A phase CT inputs: Matches applications using current transformers with 5 A secondary outputs.
- High-range control power: Accepts the specified high-range AC or DC auxiliary supply.
- 4–20 mA analog outputs: Transmits configured measurements to compatible monitoring and control equipment.
- Enhanced local display: Provides a larger LCD and improved keypad for viewing operating values, relay status and settings.
- RTD temperature monitoring: Supports connected temperature sensors for configured generator and bearing monitoring points.
- Electrical metering: Supplies generator measurements for operating assessment and supervisory monitoring.
- Trip and alarm outputs: Allows configured protection elements to activate assigned output relays.
- Serial communications: Supports data exchange with compatible supervisory systems and engineering tools.
- Drawout construction: Allows the relay unit to be withdrawn from its case for servicing and testing under the prescribed isolation procedure.
Working Principle
The SR489-P5-HI-A20-E receives generator current and voltage signals from connected instrument transformers. It processes these measurements and compares them with programmed settings for enabled protection elements, which may include overcurrent, voltage, frequency, reverse power and other generator protection functions.
RTD sensors and configured digital inputs provide additional operating information. When a measured condition satisfies a protection element’s pickup threshold and timing requirements, the relay can activate the assigned trip or alarm outputs. Event information and diagnostic data help maintenance personnel investigate abnormal operation and review the sequence of events.
The A20 option provides 4–20 mA analog outputs. Depending on the relay configuration, these outputs can represent supported measurements for compatible external meters, controllers or plant monitoring systems.
The HI option determines the auxiliary supply range required by the relay. Correct CT and VT wiring, transformer-ratio settings, protection thresholds and output assignments are essential for proper operation. The relay’s actual response depends on the functions enabled and the settings applied during commissioning.
Role in a Generator Protection and Control Architecture
The GE Multilin 489 serves as a dedicated generator protection and monitoring device between the generator measurement circuits, breaker-control circuitry and plant supervision system. It evaluates connected signals locally and issues configured trip or alarm commands when programmed conditions are satisfied.
| System Component | Function | Relationship to the Relay |
|---|---|---|
| Generator Current Transformers | Provide scaled generator current signals | Supply phase-current measurements matching the 5 A input configuration |
| Voltage Transformers | Provide generator voltage signals | Supply voltage measurements for configured protection and metering |
| RTD Temperature Sensors | Measure generator and bearing temperatures | Supply thermal information to configured monitoring functions |
| Generator Circuit Breaker | Connects or isolates the generator | Receives trip commands through the assigned control circuit |
| Alarm and Annunciation System | Alerts operators to abnormal conditions | Receives configured relay alarms and status information |
| Plant PLC or SCADA System | Supervises equipment and displays operating values | Exchanges supported measurements and status information |
| Engineering Computer | Configures relay settings and retrieves diagnostics | Connects through supported communication interfaces and compatible software |
| Auxiliary Control Power Supply | Powers the relay | Must meet the HI option’s specified AC or DC input range |
Industrial Applications
| Application | Protection or Monitoring Task | Role of the Relay |
|---|---|---|
| Industrial Generator Sets | Monitoring generator electrical conditions | Evaluates configured protection elements and operates assigned trip or alarm outputs |
| Standby Power Systems | Supervising generator operation during backup service | Provides generator protection and operating measurements |
| Combined Heat and Power Plants | Monitoring generators operating alongside plant loads | Consolidates protection, metering and diagnostic information |
| Industrial Power Stations | Detecting electrical and thermal operating abnormalities | Supports configured generator protection and alarm handling |
| Cogeneration Systems | Monitoring generator output and connected temperature signals | Provides electrical measurements and condition monitoring |
| Generator Control Panels | Integrating protection with breaker and operator interfaces | Connects instrument-transformer inputs, control outputs and supervisory communications |
Installation and Maintenance
- Verify the complete order code: Confirm that SR489-P5-HI-A20-E matches the required current-input, control-power, analog-output and display configuration.
- Check panel mounting requirements: Verify that the panel opening, case arrangement and installation clearances match the applicable installation documentation.
- Confirm auxiliary power: Ensure that the supply is within the HI option’s range of 90–300 V DC or 70–265 V AC at 48–62 Hz.
- Inspect current transformer wiring: Confirm the 5 A secondary rating, phase identification, polarity and grounding arrangements before connecting current inputs.
- Verify voltage transformer connections: Check voltage wiring, phase relationships, transformer ratios and corresponding relay settings.
- Check digital input circuits: Verify that external contacts and status signals are connected to the intended opto-isolated inputs.
- Test analog output loops: Confirm that receiving equipment supports 4–20 mA signals and that output scaling and loop wiring are correct.
- Inspect RTD connections: Verify sensor types, terminal assignments and wiring for configured stator or bearing temperature monitoring.
- Review protection settings: Check generator ratings, CT and VT ratios, trip thresholds, time delays and output-relay assignments before commissioning.
- Verify communication configuration: Check RS232 or RS485 wiring, protocol selection, baud rate and device addressing where applicable.
- Perform functional testing: Test measurement scaling, alarms, trip logic, output contacts and breaker-interface circuits using an approved commissioning procedure.
- Document the final configuration: Record the relay order code, control-power range, protection settings, communication parameters and functional test results.
Compatible System Components
| Component | Function | Compatibility Consideration |
|---|---|---|
| Phase Current Transformers | Supply generator phase-current signals | Match the relay’s 5 A secondary input and configured CT ratios |
| Ground Current Transformer | Supplies ground-fault current information | Select an arrangement supported by the enabled ground-protection function |
| Voltage Transformers | Supply generator voltage signals | Verify secondary ratings, connection type and programmed ratio |
| RTD Temperature Sensors | Monitor stator, bearing or other configured temperatures | Confirm sensor type and wiring compatibility |
| Generator Circuit Breaker Trip Circuit | Opens the breaker when a configured trip operates | Verify trip-coil ratings and the complete control-circuit design |
| 4–20 mA Analog Input | Receives the relay’s analog signals | Confirm input range and parameter scaling at the receiving device |
| RS485 Communication Network | Carries serial data between devices | Configure compatible communication settings and protocol |
| Plant PLC or SCADA System | Supervises generator status and measurements | Map required values using supported communication functions |
Recommended Related Models
| Model | Product Type | Relationship | Selection Consideration |
|---|---|---|---|
| GE Multilin 489-P1-HI-A20-E | Generator Management Relay | Related configuration with 1 A phase CT inputs and high-range control power | Select only when the connected phase CT secondary rating requires the P1 option |
| GE Multilin 489-P5-LO-A20-E | Generator Management Relay | Related configuration with 5 A phase CT inputs and low-range control power | Compare the required auxiliary supply range |
| GE Multilin 489-P5-HI-A1-E | Generator Management Relay | Related configuration with 5 A phase CT inputs and 0–1 mA analog outputs | Consider when the receiving equipment requires the A1 output range |
| GE Multilin 489-P5-HI-A20-T | Generator Management Relay | Related configuration with 5 A phase CT inputs, high-range power and an enhanced display with Ethernet | Verify the Ethernet requirement and complete order-code configuration |
Key Advantages
- Combines generator protection, metering and monitoring functions in one relay.
- Supports 5 A phase current transformer inputs.
- Accepts high-range AC or DC auxiliary power.
- Provides configurable 4–20 mA analog outputs.
- Supports RTD-based temperature monitoring and programmable protection logic.
- Offers local display, event information and serial communications for maintenance and supervision.
Technical FAQs
What does the HI option mean in the SR489-P5-HI-A20-E?
The HI option specifies the high-range control power supply. It accepts 90–300 V DC or 70–265 V AC at 48–62 Hz. The installed auxiliary supply must match these requirements.
Which current transformer secondary rating does the P5 configuration use?
The P5 option is for phase current transformers with 5 A secondary outputs. The connected CT ratios and phase wiring must be configured correctly in the relay settings.
What does the A20 option provide?
A20 specifies 4–20 mA analog outputs. These can transmit supported generator measurements to compatible external monitoring and control equipment, according to the configured output assignments.
What should be checked if the relay issues an unexpected trip?
Review the event record, enabled protection elements, measured values, pickup thresholds, time delays and output assignments. Also verify CT and VT wiring and the programmed transformer ratios before changing protection settings.