GE Multilin 489-P5-LO-A20-E Generator Management Relay

SKU 489-P5-LO-A20-E

Disponibile

12-month warranty
Free returns within 30 days

Manufacturer: General Electric
Product No.: 489-P5-LO-A20-E
Origin United States
Product Type: Generator Protection Relays
Payment: T/T, Western Union
Weight: 8.5 kg
Dimensions: 222 mm x 215 mm x 234 mm (H x W x D)
Shipping port: Xiamen
Warranty: 12 months

Product Documentation

Technical Datasheet (PDF) Complete specifications and technical drawings.

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Product Description

Description

The GE Multilin 489-P5-LO-A20-E Generator Management Relay is a digital protection, monitoring, and metering device designed for small to medium-sized synchronous or induction generators operating at 25 Hz, 50 Hz, or 60 Hz. As a member of the SR family of relays, this system features a draw-out construction and delivers advanced protection algorithms, including generator stator differential protection and 100% stator ground fault detection.

The unit manages thermal modeling using 12 RTD inputs, processes vibration/speed inputs via 4 analog transducer channels, and supports continuous operational logging with oscillography and event recording. Integration with industrial DCS and SCADA architectures is facilitated through front RS232, dual RS485, and 10BaseT Ethernet communications supporting Modbus RTU, Modbus TCP/IP, and DNP 3.0 protocols.

Features

High-speed dual slope differential protection with CT saturation detection algorithms.
100% stator ground protection via overvoltage and adaptive voltage differential elements.
Thermal overload modeling incorporating current unbalance biasing and RTD thermal feedback.
12 field-programmable RTD inputs supporting Platinum, Nickel, and Copper sensors with RTD voting functionality.
4 isolated 4 to 20 mA analog transducer inputs for bearing vibration and speed tracking.
4 active 4 to 20 mA analog outputs for parameter signaling to PLCs.
Integrated oscillography capturing 12 samples per cycle for up to 128 cycles.
Time-synchronized event recording up to 256 events via IRIG-B clock inputs.
Front panel interface featuring a 40-character display, numeric keypad, and 22 status LEDs.
Low-range control power supply accepting 20 to 60 VDC or 20 to 48 VAC.

Applications

Primary or backup generator protection for synchronous and induction machines.
Stator, bearing, and excitation monitoring in cogeneration facilities.
Industrial power generation systems operating at 25 Hz, 50 Hz, or 60 Hz nominal frequencies.

Ordering Information

Code Option	Selection	Specification / Description
Model	489	Generator Protection System
Phase Current Input	P5	5 A phase CT secondaries
Power Supply	LO	DC: 24 to 60 V; AC: 20 to 48 V @ 48 to 62 Hz
Analogue Outputs	A20	4 to 20 mA analog outputs
Enhancements	E	Enhanced display, larger LCD, improved keypad plus 10BaseT Ethernet Port
Environmental Protection	[None]	Standard (Harsh environment conformal coating not selected)

Technical Specifications

Parameter Category	Specification
Manufacturer	GE Vernova / Multilin
Phase Current Inputs	5 A Phase CT Secondaries (Conversion Range: 0.02 to 20 x CT)
Control Power Supply (LO)	DC: 20 to 60 V DC; AC: 20 to 48 V AC at 48 to 62 Hz
Power Consumption	45 VA maximum, 25 VA typical
Analog Outputs	4 Active 4 to 20 mA channels (Accuracy: ±1% of full scale, Max Load: 1200 Ω)
Analog Transducer Inputs	4 Channels; 0 to 1 mA, 0 to 20 mA, or 4 to 20 mA (Impedance: 226 Ω ±10%)
RTD Inputs	12 Inputs; 3-wire 100 Ω Platinum, 100 Ω Nickel, 120 Ω Nickel, 10 Ω Copper
Digital Inputs	9 Opto-isolated inputs (Dry contact < 400 Ω); Sensor supply: +24 V DC at 20 mA max
Output Relays	6 Electromechanical Form C contacts (10 A resistive at 120/250 VAC)
Phase Voltage Inputs	VT Secondary: 200 V AC full-scale; Max continuous: 280 V AC; Burden: > 500 kΩ
Neutral Voltage Inputs	VT Secondary: 100 V AC full-scale; Max continuous: 280 V AC; Burden: > 500 kΩ
Serial Communications	1 x Front RS232 (9600 baud); 2 x Rear RS485 (300 to 19200 baud)
Ethernet Communication	1 x 10Mbps Copper RJ45 Port
Communication Protocols	Modbus RTU, Modbus TCP/IP, DNP 3.0 Level 2
Operating Temperature	-40 degC to +60 degC
Storage Temperature	-40 degC to +85 degC
Operating Humidity	Up to 95% non-condensing at 55 degC
Altitude & Pollution Degree	Up to 2000 m; Pollution degree 2

Connections/Interfaces

Connector Pin / Terminal	Function
A1	RTD Shield
A2 - A4	RTD #1 (Compensation, Return, Hot)
A5 - A7	RTD #2 (Compensation, Return, Hot)
A8 - A10	RTD #3 (Compensation, Return, Hot)
A11 - A13	RTD #4 (Compensation, Return, Hot)
A14 - A16	RTD #5 (Compensation, Return, Hot)
A17 - A19	RTD #6 (Compensation, Return, Hot)
B1 - B3	Auxiliary RS485 Interface (+, -, COM)
B4 - B11	Analog Outputs 1 to 4 (+, - per output)
B12 - B19	Analog Inputs 1 to 4 (+24V, +, - per input)
B20 - B21	Analog Inputs COM
D1 - D3	RTD #7 (Compensation, Return, Hot)
D4 - D6	RTD #8 (Compensation, Return, Hot)
D7 - D9	RTD #9 (Compensation, Return, Hot)
D10 - D12	RTD #10 (Compensation, Return, Hot)
D13 - D15	RTD #11 (Compensation, Return, Hot)
D16 - D18	RTD #12 (Compensation, Return, Hot)
D19 - D21	Assignable Digital Inputs 1 to 3
D22 - D25	Assignable Digital Inputs 4 to 7
D26	Switch +24V DC Access
D27	Access Input
D28	Breaker Status Input
E1 - E12	Output Relays R1 Trip, R2 Aux, R3 Aux
F1 - F12	Output Relays R4 Aux, R5 Alarm, R6 In-Service
G1 - G3	Phase Current Inputs Phase A (16/5A, 1A/COM)
G4 - G6	Phase Current Inputs Phase B (16/5A, 1A/COM)
G7 - G9	Phase Current Inputs Phase C (16/5A, 1A/COM)
G10 - G12	Control Power Inputs (+/L, -/N, Ground)
H1 - H3	Ground Current Inputs (16/5A, 1A/COM)
H4 - H6	Neutral CT Inputs (16/5A, 1A/COM)
H7 - H9	Phase Voltage Sensing (Va, Vb, Vc)
H10 - H12	Voltage Sensing Neutral / Open Delta Connections

Installation Guidelines

Grounding: Connect safety ground and filter ground terminals independently to the main station ground bus to satisfy noise rejection and safety standards.
Wiring Safeguards: Ensure CT connections pass through automatic shorting terminals before servicing or removing the draw-out unit.
Control Power Matching: Confirm that the supply voltage matches the low-voltage range (20 to 60 VDC / 20 to 48 VAC) prior to applying power to terminals G10-G12.
Shielding & Interference Mitigation: Route RTD and analog transducer signal cables using twisted-pair shielded conductors, grounding the shields exclusively at the designated shield terminals.
Communication Lines: Terminate RS485 networks with 120-ohm resistors and 1 nF capacitors at both ends of the loop.

Compliance and Certifications

ISO: Manufactured under an ISO9001 registered system.
CSA/UL: Certified to UL508, UL1053, and CSA C22.2 No. 14 standards.
CE: Conforms to EN60255-5 and EN50263 standards.
Type Tests: Complies with IEC 61000-4 series, EN60255 series, IEEE/ANSI C37.90.1, C37.90.3, and CISPR11/22 requirements.

Shipping & Returns

Global Express Shipping

Standard Delivery: 4–6 business days via DHL, FedEx, and UPS.
Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
Worldwide Coverage: Serving over 150 countries.

Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our technical warranty.

FAQ

What power supply range is required for this protection unit?

The device operates on a low-voltage control supply input of 20 to 60 V DC or 20 to 48 V AC at 48 to 62 Hz.

Which temperature sensors are supported by the RTD input channels?

The relay supports 3-wire 100 ohm Platinum, 100 ohm Nickel, 120 ohm Nickel, and 10 ohm Copper RTD sensors across 12 field-programmable channels.

What communication interfaces are included with this model?

This model includes a front-panel RS232 port, two rear RS485 ports, and a 10BaseT Ethernet copper port.

What is the secondary current rating for the main phase CT inputs?

The phase current inputs are rated for 5 A nominal CT secondaries.

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