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2.10 Synchrocheck (25)
2 Protection functions
Technical description
72
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The following signals of the stage are available in the output
matrix and the logic: “Request”, “OK” and “Fail”. The “request”-
signal is active, when a request has received but the breaker is
not yet closed. The “OK”-signal is active, when the
synchronising conditions are met, or the voltage check criterion
is met. The “fail”-signal is activated, if the function fails to close
the breaker within the request timeout setting. See below the
figure.
Figure 2.10-1 The principle of the synchrocheck function
Please note that the control pulse of the selected object should
be long enough. For example, if the voltages are in opposite
direction, the synchronising conditions are met after several
seconds.
Figure 2.10-2 The block diagram of the synchrocheck and the controlling
object
Please note that the wiring of the secondary circuits of voltage
transformers to the device terminal depends on the selected
voltage measuring mode.