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- SR489-CASE 489-P5-HI-A20-E
- Generator Management Relay
- USA
- 252 × 216 × 224 mm
- 7.7 kg
- Xiamen, China
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Product Overview
The GE SR489-CASE 489-P5-HI-A20-E Generator Management Relay is part of the GE Multilin 489 generator protection and management system. It combines electrical protection, generator condition monitoring, metering, alarm handling and trip control in a drawout relay package. It is intended for synchronous and induction generator applications where operating measurements and fault conditions need to be evaluated by a dedicated protection relay.
This configuration specifies 5 A phase current transformer inputs, a high-range control power supply and 4–20 mA analog outputs. The high-range supply accepts 90–300 V DC or 70–265 V AC at 48–62 Hz. The enhanced-display option provides a larger LCD for local status and measurement viewing.
The relay can monitor generator electrical quantities alongside temperature and other connected condition signals. Configured protection functions can initiate trips or alarms when programmed thresholds and operating conditions are met. Its communications ports also support integration with supervisory systems and engineering tools.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | GE |
| Model / Order Number | SR489-CASE 489-P5-HI-A20-E |
| Product Family | GE Multilin 489 |
| Product Type | Generator Management Relay |
| Relay Series | SR Series |
| Phase CT Input Rating | 5 A |
| Control Power Option | HI |
| Control Power Input | 90–300 V DC or 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 |
| Output Relays | 6 |
| Digital Inputs | 9 opto-isolated inputs |
| Communication Interfaces | RS232 and RS485 |
| Supported Protocols | Modbus RTU, DNP 3.0 |
| Protection Functions | Generator electrical and thermal protection, configurable trips and alarms |
| Enclosure / Mounting Format | Drawout relay package |
| Dimensions | 252 × 216 × 224 mm |
| Weight | 7.7 kg |
Product Features
- Generator protection: Supports configurable protection functions for generator electrical faults and abnormal operating conditions.
- 5 A phase current inputs: Matches the P5 order-code option for phase current transformer secondary inputs.
- High-range control power: Accepts the HI option’s specified AC or DC control supply ranges.
- 4–20 mA analog outputs: Supports analog signal transmission to compatible monitoring or control equipment.
- Enhanced LCD display: Provides a larger local display for viewing relay information and operating measurements.
- Thermal monitoring: Supports RTD-based temperature monitoring for configured generator and bearing protection applications.
- Power metering: Provides generator electrical measurements for local assessment and supervisory monitoring.
- Event and trip records: Stores event information and trip-related data to assist fault investigation.
- Serial communications: Provides RS232 and RS485 interfaces for configuration and system communication.
- Drawout construction: Allows the relay unit to be withdrawn from its case for servicing in accordance with the applicable procedure.
Working Principle
The 489 relay receives generator current and voltage signals through connected current transformers and voltage transformers. It processes these measurements to evaluate electrical conditions such as overcurrent, voltage abnormalities, frequency deviations, reverse power and other configured generator protection elements.
Additional inputs can be used for temperature measurements, analog condition signals and external status information. The relay compares measured values with programmed setpoints and timing characteristics. When a configured trip or alarm condition is satisfied, it operates the assigned output relay or relays and records relevant event information.
The relay’s metering and diagnostic functions allow operators and maintenance personnel to review generator measurements and investigate abnormal operation. Serial communication supports access to information from compatible supervisory or engineering systems. Actual protection behavior depends on the enabled functions, correct instrument-transformer wiring, setpoint configuration and output-relay assignments.
Role in a Generator Protection and Control Architecture
The GE Multilin 489 acts as a dedicated protection and monitoring device between generator measurement circuits, the generator breaker control circuit and the plant monitoring system. It evaluates measured conditions locally and can issue configured trip or alarm outputs without relying solely on a supervisory controller.
| System Component | Function | Relationship to the Relay |
|---|---|---|
| Generator Current Transformers | Provide scaled generator current signals | Supply phase and ground-current measurements as configured |
| Voltage Transformers | Provide scaled generator voltage signals | Supply voltage measurements for electrical protection and metering |
| Generator RTD Sensors | Measure stator or bearing temperatures | Provide thermal data to configured monitoring functions |
| Generator Circuit Breaker | Connects or isolates the generator from the electrical system | Receives trip commands through the assigned protection circuit |
| Alarm and Annunciation System | Alerts operators to abnormal conditions | Receives assigned relay alarm outputs or communication data |
| Plant PLC or SCADA System | Supervises plant operation and displays measurements | Exchanges available status and metering information through supported interfaces |
| Engineering Computer | Configures settings and retrieves diagnostic information | Communicates through supported serial interfaces and compatible software |
| Auxiliary Control Power Supply | Powers the relay | Must meet the selected HI control-power 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 trip or alarm outputs |
| Standby Power Generation | Supervising generator operation during backup service | Supports electrical protection and condition monitoring |
| Combined Heat and Power Plants | Protecting generators operating alongside plant loads | Provides generator measurements, alarms and configured trip functions |
| Small and Medium Power Stations | Monitoring generator performance and abnormal conditions | Consolidates protection, metering and event information |
| Industrial Cogeneration Systems | Detecting electrical and thermal operating abnormalities | Supports generator protection and connected condition monitoring |
| Generator Control Panels | Integrating protection and local status indication | Connects instrument-transformer signals, breaker control and monitoring interfaces |
Installation and Maintenance
- Verify the complete order code: Confirm that SR489-CASE 489-P5-HI-A20-E matches the required current-input, control-power, analog-output and display options.
- Check the panel cutout: Confirm that the panel and relay case arrangement match the installation drawing and required clearances.
- Verify control power: Ensure that the supply falls within the HI option’s specified AC or DC input range before energizing the relay.
- Check 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 input wiring, phase relationships and configured VT ratios against the generator measurement design.
- Inspect digital input circuits: Confirm that external contacts and status signals are wired to the intended opto-isolated inputs.
- Check analog output loops: Verify that the receiving equipment supports the 4–20 mA output range and that loop wiring is correctly installed.
- Inspect RTD connections: Check sensor type, terminal assignments and wiring for configured stator or bearing temperature monitoring.
- Configure protection setpoints: Review generator ratings, CT and VT ratios, trip thresholds, time delays and output-relay assignments before commissioning.
- Verify communication settings: Check the RS232 or RS485 connection, baud rate, protocol and addressing where applicable.
- Perform functional testing: Test measurement scaling, alarms, trip logic, output contacts and breaker-interface circuits using an approved commissioning procedure.
- Record settings and test results: Keep a controlled record of the relay configuration, protection setpoints, wiring checks and functional test results.
Compatible System Components
| Component | Function | Compatibility Consideration |
|---|---|---|
| Phase Current Transformers | Supply generator phase-current signals | Match the 5 A secondary input option and configured CT ratios |
| Ground Current Transformer | Supplies ground-fault current information | Select the transformer arrangement supported by the configured ground-protection function |
| Voltage Transformers | Supply generator voltage signals | Confirm VT connection type, secondary rating and programmed ratio |
| RTD Temperature Sensors | Monitor stator or bearing temperatures | Use sensor types and wiring supported by the relay configuration |
| Generator Circuit Breaker Trip Circuit | Opens the breaker when a configured trip operates | Verify trip-coil ratings, interposing devices and control-circuit design |
| 4–20 mA Monitoring Input | Receives analog output signals | Confirm signal scaling and input compatibility at the receiving device |
| RS485 Communication Network | Carries serial data between devices | Configure compatible serial settings and protocol |
| Plant PLC or SCADA System | Supervises generator status and measurements | Map the required data using supported communication functions |
Recommended Related Models
| Model | Product Type | Relationship | Selection Consideration |
|---|---|---|---|
| GE Multilin 489-P1-HI-A20-E | Generator Management Relay | Related 489 configuration with 1 A phase CT inputs | Select only when the connected phase CT secondary rating and system configuration require the P1 option |
| GE Multilin 489-P5-LO-A20-E | Generator Management Relay | Related 489 configuration with 5 A phase CT inputs and low-range control power | Verify the required AC/DC control supply range |
| GE Multilin 489-P5-HI-A1-E | Generator Management Relay | Related 489 configuration with 5 A phase CT inputs and 0–1 mA analog outputs | Consider only when the receiving equipment requires the A1 analog-output range |
| GE Multilin 489-P5-HI-A20 | Generator Management Relay | Related 489 order-code configuration without the E enhanced-display option | Compare display requirements and the complete ordered configuration |
Key Advantages
- Combines generator protection, monitoring and metering functions in one relay.
- Supports configurable trip and alarm logic for generator operating conditions.
- Matches 5 A phase current transformer inputs.
- Accepts the specified high-range AC or DC control power supply.
- Provides 4–20 mA analog outputs for compatible monitoring equipment.
- Supports local indication, event review and serial communication with supervisory systems.
Technical FAQs
What does the P5 option mean in the 489-P5-HI-A20-E order code?
P5 specifies 5 A phase current transformer secondary inputs. The connected CT secondary rating and the programmed CT ratio must match the relay configuration.
What control power can the HI version accept?
The HI option supports 90–300 V DC or 70–265 V AC at 48–62 Hz. The actual supply must remain within the specified range for the relay to operate correctly.
What is the purpose of the A20 analog-output option?
A20 identifies the 4–20 mA analog-output option. These outputs can transmit configured measurements or signals to compatible monitoring and control equipment, subject to the relay configuration.
How should the relay be tested before being placed in service?
Verify CT and VT wiring, measurement scaling, control power, configured setpoints, digital inputs, analog outputs, communication settings and assigned trip or alarm contacts. Protection and breaker-interface tests should follow an approved commissioning procedure.