ABB RED615 Technical Manual page 703

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1YHT530004D05 D

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 are as follows:

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 reclose attempts are made. The third and fourth times

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

A070866 V3 EN

Autoreclose configuration example

Delayed DEL_INIT_2...4 signals are used only when the auto-reclose shot is

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

function opens the circuit breaker and an auto-reclose 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 auto-reclose 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 auto-reclose situation is where one auto-reclose 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 auto-reclose sequence is successful: the reclaim time elapses and no

new sequence is started.

BLK _RECL _T

INHIBIT_ RECL

Control functions

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