ABB RELION REX640 Technical Manual page 1515

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1MRS759142 C

Technical Manual

Str 3 delay shot 1

Str 3 delay shot 2

Str 3 delay shot 3

Str 3 delay shot 4

Time delay settings for the DEL_INIT_4 signal

Str 4 delay shot 1

Str 4 delay shot 2

Str 4 delay shot 3

Str 4 delay shot 4

Normally, only two or three reclosing attempts are made. The third and fourth

attempts are used to provide the so-called fast final trip to lockout.

GUID-DD4A18E3-770F-4A83-93A9-C9F3A6726FC4 V1 EN

Autoreclosing configuration example

Delayed DEL_INIT_2...4 signals are used only when the autoreclosing shot is

initiated with the start signal of a protection stage. After a start delay, the AR function

opens the circuit breaker and an autoreclosing shot is initiated. When the shot is

initiated with the trip signal of the protection, the protection function trips the circuit

breaker and simultaneously initiates the autoreclosing shot.

If the circuit breaker is manually closed against the fault, that is, if SOTF is used, the

fourth time delay can automatically be taken into use. This is controlled with the

internal logic of the AR function and the Fourth delay in SOTF parameter.

A typical autoreclose situation is where one autoreclosing shot has been performed

after the fault was detected. There are two types of such cases: operation initiated with

protection start signal and operation initiated with protection trip signal. In both cases,

the autoreclosing sequence is successful: the reclaim time elapses and no new

sequence is started.

BLK _RECL _T

INHIBIT_ RECL

Control functions

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