Closing angle = ∠ −∠
( )
°+ −
( )
× +
( )
× °
( )
U U f f T T
Bus Line Bus line CB PL
360
GUID-48292FC2-C00C-4166-BCAD-FFC77D7F196B V1 EN (Equation 88)
φ
U_BUS
Measured bus voltage phase angle
φ
U_LINE
Measured line voltage phase angle
f
U_BUS
Measured bus frequency
f
U_LINE
Measured line frequency
T
CB
Total circuit breaker closing delay, including the delay of the IED output contacts defined
with the
Closing time of CB
setting parameter value
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
U_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 U_DIFF_SYNC,
PH_DIF_SYNC and FR_DIFF_SYNC. These monitored data values are updated
only when the Synchro check is 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.
SECRSYN CBXCBR
I
Closing
permission
Closing
command
GUID-A9132EDC-BFAB-47CF-BB9D-FDE87EDE5FA5 V2 EN
Figure 365: A simplified block diagram of the Synchro check function in the
continuous mode operation
1YHT530004D05 D Section 9
Control functions
615 series 683
Technical Manual
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