Function Block; Functionality - ABB RELION 620 Series Technical Manual

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Control functions

Function block

A070836-ANSI V1 EN

Function block

About 80 to 85 percent of faults in the MV overhead lines are transient and automatically

cleared with a momentary de-energization of the line. The rest of the faults, 15 to 20

percent, can be cleared by longer interruptions. The de-energization of the fault location

for a selected time period is implemented through automatic reclosing, during which most

of the faults can be cleared.

In case of a permanent fault, the automatic reclosing is followed by final tripping. A

permanent fault must be located and cleared before the fault location can be re-energized.

The autoreclosing function can be used with any circuit breaker suitable for autoreclosing.

The function provides five programmable autoreclosing shots which can perform one to

five successive autoreclosing of desired type and duration, for instance one high-speed

and one delayed autoreclosing.

When the reclosing is initiated with pickup of the protection function, the autoreclosing

function can execute the final trip of the circuit breaker in a short trip time, provided that

the fault still persists when the last selected reclosing has been carried out.

Protection signal definition

The Control line setting defines which of the initiation signals are protection pickup and

trip signals and which are not. With this setting, the user can distinguish the blocking

signals from the protection signals. The Control line setting is a bit mask, that is, the lowest

bit controls the INIT_1 line and the highest bit the INIT_6 line. Some example

combinations of the Control line setting are as follows:

1MAC504801-IB E

620 series ANSI

Technical Manual

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