ABB RELION Series, Техническое руководство

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the closing signal is given until the circuit breaker finally closes is about 50...250 ms.
The selected
Closing time of CB informs the function how long the conditions have to
persist. The Synchro check function compensates for the measured slip frequency and
the circuit breaker closing delay. The phase angle advance is calculated continuously
with the formula.
Closing angle
= ∠ − ∠
( )
° + −
( )
× +
( )
× °
( )
U U f f T T
Bus Line Bus line CB PL
360
GUID-48292FC2-C00C-4166-BCAD-FFC77D7F196B V1 EN
(Equation 74)
∠ U
Bus
Measured bus voltage phase angle
∠U
Line
Measured line voltage phase angle
f
Bus
Measured bus frequency
f
line
Measured line frequency
T
CB
Total circuit breaker closing delay, including the delay of the protection relay 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.
1MRS758755 A
Section 9
Control functions
REC615 and RER615 621
Technical Manual