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

of ground current detection.

• Core balance (Zero sequence) current

transformer.

• Core balance (Zero sequence) 50:0.025 A

(sensitive) current transformer.

• Residual connection of phase current

transformers.

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.

Underpower

Used to detect loss of load.

Reverse Active Power

Useful to detect conditions where the motor

can become a generator.

Overtorque

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

flash.

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.

Oscillography

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

stamped.

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

functionality: