ABB RELION REX640 Technical Manual page 938

Protection and control

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Table of Contents

Protection functions

Load-shedding steps

LSHDPFRQ Input signals

Table 896: LSHDPFRQ Input signals

LSHDPFRQ Output signals

Table 897: LSHDPFRQ Output signals

LSHDPFRQ Settings

Table 898: LSHDPFRQ Group settings (Basic)

Values (Range)

Load shed mode

6=Freq< OR df/dt

Table continues on the next page

Restore start Val setting

0.990 · Fn (49.5 Hz)

Restore delay time setting

Three-phase voltages

Block signal for acti-

vating the blocking

Block restore

Manual restore signal

Operation of load shedding

Operate signal for under fre-

Operate signal for high df/dt

Pick-Up signal for under fre-

quency detection

Pick-Up signal for high df/dt

Restore signal for load restor-

ing purposes

Restore frequency attained

and restore timer started

1MRS759142 F

Set the operation

mode for load

shedding function

Technical Manual