GE Multilin 489-P5-HI-A20 Generator Management Relay

Overview

The GE Multilin 489‑P5‑HI‑A20 is a high-performance generator management relay designed to protect small to medium synchronous and induction generators. It delivers comprehensive protection, monitoring, and control while minimizing downtime during maintenance. Moreover, its draw-out construction simplifies installation, testing, and replacement, making it ideal for industrial and utility environments. In addition, the relay integrates advanced diagnostics and event recording, helping operators identify and address faults efficiently.

Key Features & Functional Highlights

• Complete generator protection including overcurrent, ground fault, voltage, frequency, and loss-of-field protection

• Stator and bearing thermal monitoring via RTD inputs

• Analog inputs for vibration monitoring to detect early mechanical issues

• Advanced event recording and disturbance capture for rapid troubleshooting

• Supports multiple communication protocols including IEC 61850, Modbus RTU, and DNP3

• Draw-out relay design for fast installation and minimal service interruption

• Global acceptance as part of GE’s SR family of generator protection relays

Technical Specifications

Model: 489‑P5‑HI‑A20
Manufacturer: GE Multilin (GE Vernova Grid Solutions)
Series: Multilin 489 Generator Protection System
Type: Generator Management Relay
Phase Current Inputs: 5 A CT secondaries (P5)
Control Power: 90–300 V DC / 70–265 V AC, 48–62 Hz (HI)
Analog Outputs: 4–20 mA (A20)
Display: Enhanced LCD (E)
Nominal Voltage Inputs: 120 V AC / 100 V DC (Phase-to-Neutral)
Frequency: 50 Hz / 60 Hz
Metering Accuracy: Class 0.5 or better for voltage, current, and power
Fuse Model: 215‑02.5
Ingress Protection: IP40
Operating Temperature: -20°C to +60°C
Control Power Burden: <20 W

Protection Functions:

• Stator differential protection

• Overcurrent, ground fault, and thermal protection via RTDs

• Voltage, frequency, and loss-of-field protection

Monitoring Features:

• Analog inputs for vibration and mechanical condition monitoring

• Event and disturbance recording for diagnostics and analysis

Communication Protocols:

• IEC 61850 (optional)

• Modbus RTU

• DNP3

Typical Applications

• Industrial and utility synchronous and induction generators

• Small to medium power plants requiring reliable generator protection

• Integration into automated substation systems for real-time monitoring

• Environments requiring quick maintenance turnaround due to draw-out design

FAQ

Q: What types of generators can the 489‑P5‑HI‑A20 protect?
A: It protects both synchronous and induction generators in industrial and utility environments.

Q: Can it monitor generator thermal conditions?
A: Yes, it uses RTD inputs to track stator and bearing temperatures.

Q: Which communication protocols are supported?
A: IEC 61850, Modbus RTU, and DNP3 depending on configuration.

Q: How is the relay installed and serviced?
A: Its draw-out construction allows fast installation, testing, and replacement.