ABB RELION 620 Series Technical Manual page 762

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Control functions

FR_DIFF_MEAS and PH_DIFF_MEAS. Also, the indications of the conditions that are

not fulfilled and thus preventing the breaker closing permission are available as monitored

data values V_DIFF_SYNC, PH_DIF_SYNC and FR_DIFF_SYNC. These monitored

data values are updated only when the Synchro check enabled with the Synchro check

mode setting and the measured ENERG_STATE is "Both Live".

Continuous mode

The continuous mode is activated by setting the parameter Control mode to "Continuous".

In the continuous control mode, Synchro check is continuously checking the

synchronism. When synchronism is detected (according to the settings), the SYNC_OK

output is set to TRUE (logic '1') and it stays TRUE as long as the conditions are fulfilled.

The command input is ignored in the continuous control mode. The mode is used for

situations where Synchro check only gives the permission to the control block that

executes the CB closing.

GUID-3921CB7B-0BBD-4BB3-B0E7-BFF043900C97 V1 EN

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.

1MAC504801-IB E

620 series ANSI

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