ABB 615 series Technical Manual page 987

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1MAC059074-MB A

615 series ANSI

Technical Manual

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A simplified block diagram of the Synchro check function in the

continuous mode operation

Command mode

If Control mode is set to "Command", the purpose of the Synchro check functionality in

the command mode is to find the instant when the voltages on both sides of the circuit

breaker are in synchronism. The conditions for synchronism are met when the voltages on

both sides of the circuit breaker have the same frequency and are in phase with a

magnitude that makes the concerned busbars or lines such that they can be regarded as

In the command mode operation, an external command signal CL_COMMAND, besides the

normal closing conditions, is needed for delivering the closing signal. In the command

control mode operation, the Synchro check function itself closes the breaker via the

SYNC_OK output when the conditions are fulfilled. In this case, the control function block

delivers the command signal to close the Synchro check function for the releasing of a

closing-signal pulse to the circuit breaker. If the closing conditions are fulfilled during a

permitted check time set with Maximum Syn time, the Synchro check function delivers a

closing signal to the circuit breaker after the command signal is delivered for closing.

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A simplified block diagram of 25 in the command mode operation

Control functions

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