GE SR489-P5-HI-A20-E

Description

Product Overview

The GE SR489-P5-HI-A20-E is a high-performance, multi-function generator protection relay from the UR (Universal Relay) family of GE Multilin. This advanced Intelligent Electronic Device (IED) is designed to provide comprehensive protection, control, metering, and monitoring for medium to large synchronous generators in power generation plants, industrial facilities, and cogeneration applications. The GE SR489-P5-HI-A20-E integrates a wide array of protection functions into a single, compact unit, safeguarding the generator from internal and external electrical faults, abnormal operating conditions, and system disturbances. Its sophisticated design and powerful processing capabilities make the GE SR489-P5-HI-A20-E a cornerstone of modern generator management, ensuring reliability, stability, and operational efficiency.

Product Parameters and Specifications

• Manufacturer: GE (General Electric) Multilin.

• Product Series: UR Family (SR489 Series).

• Device Type: Generator Protection Relay.

• Key Protection Functions:

  • Differential Protection (87G): High-speed protection for stator winding faults.

  • Stator Ground Fault Protection (59N/27TN): For ground faults within the stator winding.

  • Loss of Field (40): Protects against loss of excitation.

  • Negative Sequence / Unbalance (46): Protects against stator overheating due to unbalanced currents.

  • Over/Under Frequency (81O/U) & Voltage (59/27): Protects against system frequency and voltage excursions.

  • Reverse Power (32): Detects motoring of the generator.

  • Overexcitation (24): Protects the generator and step-up transformer from excessive V/Hz.

  • Out-of-Step (78): Detects pole slipping.

• Inputs: Multiple current transformer (CT) and voltage transformer (VT) inputs for three-phase and neutral measurements.

• Control & Monitoring: Includes programmable logic, sequence of events (SOE) recorder, oscillographic fault recording (COMTRADE), and extensive metering (currents, voltages, power, energy, harmonics).

• Communication: Equipped with multiple ports supporting Ethernet (Modbus TCP/IP, DNP3 over TCP, IEC 61850) and serial (RS485 for Modbus RTU, DNP3). The -E suffix typically denotes enhanced communication features.

• Human-Machine Interface (HMI): Features a backlit LCD display and keypad for local configuration and data viewing.

• Configuration Software: Programmed using GE’s EnerVista UR Setup software.

Advantages and Key Features

1. Comprehensive All-in-One Protection: The GE SR489-P5-HI-A20-E consolidates numerous standalone protection functions into one device, simplifying system design, reducing panel space, and lowering wiring complexity and cost.

2. Advanced Algorithms and Flexibility: Utilizes sophisticated algorithms for highly accurate and secure protection. Its flexible programmable logic allows customization of control schemes, alarm handling, and integration with external devices.

3. Powerful Diagnostics and Recording: Extensive diagnostic capabilities, high-resolution oscillographic recording, and a detailed sequence of events log provide invaluable data for post-fault analysis, reducing mean time to repair and improving system understanding.

4. Modern Communication Protocols: Native support for IEC 61850 and other industry-standard protocols enables seamless integration into modern digital substation architectures and SCADA/EMS systems, facilitating remote monitoring and control.

5. Proven Reliability and Global Support: As part of the widely deployed GE Multilin UR family, the SR489-P5-HI-A20-E has a proven track record of reliability and is backed by a global service and support network.

Application Case Studies

• Industrial Cogeneration Plant: A factory with a captive gas turbine generator uses the GE SR489-P5-HI-A20-E to protect its 20 MVA generator. The relay provides differential protection against internal winding faults, reverse power protection to prevent motoring when the turbine trips, and voltage/frequency protection to ensure power quality for sensitive plant equipment.

• Hydroelectric Power Station: For a hydro generator, the relay’s loss-of-field (40) and out-of-step (78) protection are critical for stability during grid disturbances. Its metering functions provide real-time data on MVAR production for reactive power dispatch.

• Peaking Power Plant (Gas Engine): Multiple SR489-P5-HI-A20-E relays protect individual generators in a peaking plant. Their communication capabilities allow centralized remote control from the grid operator and efficient data aggregation for performance reporting.

Comparison with Competing Products

Selection Suggestions and Important Notes

• Selection Suggestion:

  • Choose the GE SR489-P5-HI-A20-E for the primary protection of medium to large generators (typically 5 MVA and above) in utility, industrial, or independent power producer (IPP) applications.

  • It is particularly well-suited for projects where integration with existing GE Multilin devices or the use of EnerVista software is advantageous.

  • Select this relay when a combination of advanced protection, detailed metering, and robust communication (especially IEC 61850) is required in a single device.

• Important Notes:

  • CT/VT Requirements: Carefully specify the current and voltage transformer ratios and burdens to ensure compatibility and measurement accuracy. The relay’s settings must match the instrument transformer characteristics.

  • Setting Coordination: Generator protection settings must be carefully coordinated with the generator capability curve, excitation system, and upstream/downstream protection (e.g., transformer differential, grid interconnection relay). This requires specialized engineering expertise.

  • Firmware Management: Ensure the relay is loaded with the correct and latest firmware version that supports all required functions and communication protocols. Firmware updates should be performed with caution.

  • Testing and Commissioning: Thorough secondary injection testing using a modern relay test set is mandatory to verify the operation of all protection elements, logic, and communication before placing the generator in service.

  • Cybersecurity: When connected to plant or corporate networks, implement appropriate cybersecurity measures as per the relay’s security guidelines (e.g., changing default passwords, using firewalls, disabling unused services).

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