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GE Grid Solutions Multilin 469 SR469-P5-HI-A20-E-H
Source:GE | Author:Make | Published time: 2022-01-08 | 721 Views | Share:

GE Grid Solutions Multilin 469  SR469-P5-HI-A20-E-H

The Multilin™ 469 Motor Protection System, a member of the SR family of relays, provides protection,

control, simplified configuration and advanced communications in a cost effective industry leading

draw-out construction. Designed for medium voltage motors, the 469 delivers advanced protection with

customizable overload curves and single CT differential protection for added flexibility. The 469 also

provides simplified configuration using the Motor Settings Auto-Configurator, providing a quick and easy

set-up of motor parameters. Coupled with advanced protection and diagnostics, the 469 provides users

the flexibility of multiple communication protocols allowing integration into new and existing control


Key Benefits

• Comprehensive motor protection plus voltage dependant overload curves, torque metering and

protection, broken rotor bar protection

• Most advanced thermal model - Including multiple RTD inputs for stator thermal protection

• Minimize replacement time - Draw-out construction

• Complete asset monitoring - Temperature, Analog I/O, full metering including demand & energy

• Improve uptime of auxiliary equipment - Through I/O monitoring

• Reduce troubleshooting time and maintenance costs - Event reports, waveform capture, data logger

• Built in simulation functions simplify testing and commissioning

• Cost Effective Access to information - Through standard RS232 & RS485 serial ports, and optional Ethernet and DeviceNet Ports

• Field upgradable firmware and settings

• Optional Conformal coating for exposure to chemically corrosive or humid environments

Motor Thermal Model

The primary protective function of the 469 is the

thermal model with six key elements:

• Overload Curves

• Unbalance Biasing

• Hot/Cold Safe Stall Ratio

• Motor Cooling Time Constants

• Start Inhibit and Emergency Restart

• RTD Biasing

Ground Fault

This function is designed to protect motors

against phase to ground faults.

There are two dedicated ground current inputs

in the relay, which support the following types

of ground current detection.

• Core balance (Zero sequence) current


• Core balance (Zero sequence) 50:0.025 A

(sensitive) current transformer.

• Residual connection of phase current


The function is equipped with an overreach filter,

which removes the DC component from the

asymmetrical current present at the moment a

fault occurs, or a motor starts. Two pickup levels

( trip and alarm) with individual time delays are

available for ground fault detection.

A trip Backup feature is also available as part

of this function. The operational principal of

Ground Fault Trip Backup is the same as of

Short Circuit Trip Backup.

Reactive Power

This element is used in applications where the

reactive power limit is specified.


Used to detect loss of load.

Reverse Active Power

Useful to detect conditions where the motor

can become a generator.


This element is used to protect the driven load

from mechanical breakage.

Current Unbalance

In addition to thermal model biasing current

unbalance is available in the 469 relay as an

independent element with 2 pickup levels and a

built-in single phasing detection algorith

Keypad and Display

The 469 has a keypad and 40 character display

for local monitoring and relay configuration

without the need for a computer. Up to 20

user-selected default messages can be

displayed when inactive. In the event of

a trip, alarm, or start block, the display

will automatically default to the pertinent

message and the Message LED indicator will


Event Recorder

The event recorder stores motor and system

information with a date and time stamp each

time a system event occurs. Up to 256 events

are recorded.


The 469 records up to 64 cycles with 12 samples

per cycle of waveform data for 10 waveforms

(Ia, Ib, Ic, Ig, Diffa, Diffb, Diffc, Va, Vb, Vc) each

time a trip occurs. The record is date and time


Viewpoint Monitoring

Viewpoint Monitoring is a powerful yet simpleto-

use monitoring and data recording of

small systems. Viewpoint Monitoring provides

a complete HMI package with the following


• Plug-&-Play Device Monitoring

• Single-Line Monitoring & Control

• Annunciator Alarming

• Trending Reports

• Automatic Event Retrieval

• Automatic Waveform Retrieval