ABB RER620, Technical Manual

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1MAC309294-MB F
Section 5
Control functions
RER620 327
Technical Manual
breaker closing delay. The phase angle advance is calculated continuously with the
formula:
The closing angle is the estimated angle difference after the breaker closing delay.
The Minimum Syn time setting time can be set, if required, to demand the minimum time
within which conditions must be simultaneously fulfilled before the
SYNC_OK
output is
activated.
The measured voltage, frequency and phase angle difference values between the two sides
of the circuit breaker are available as monitored data values V_DIFF_MEAS,
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 synch-check enabled with the
Synch check mode
setting and the measured ENERG_STATE is “ Both Live ” .
Continuous mode
The synch-check functionality can be selected with the Control mode setting. The
“Continuous” mode can be used for two different operating conditions, the most typical of
which is where both sides of the circuit breaker to be closed are live. The synchronism is
always checked before the circuit breaker is given the permission to close. The other
situation is where one or both sides of the circuit breaker to be closed are dead and,
consequently, the frequency and phase difference cannot be measured. In this case, the
function checks the energizing direction. The user is able to define the voltage range within
which the measured voltage is determined to be “live” or “dead”.
The continuous control mode is selected with the Control mode setting. In the continuous
control mode, the synch-check is continuously checking the synchronism. When the
synchronism conditions or the energizing check conditions are fulfilled, the
SYNC_OK
output is activated and it remains activated as long as the conditions remain fulfilled. The
command input is ignored in the continuous control mode. The mode is used for situations
where the synch-check only gives the permission to the control block that executes the CB
closing.
φ
V_BUS
Measured bus voltage phase angle
φ
V_LINE
Measured line voltage phase angle
f
V_BUS
Measured bus frequency
f
V_LINE
Measured line frequency
T
CB
Total circuit breaker closing delay, including the delay of the relay output contacts defined with
the Closing time of CB setting parameter value