ABB 615 series Technical Manual page 986

Section 9
Control functions
980
breaker closing delay. The phase angle advance is calculated continuously with the
formula.
Closing angle V V
(
= ∠ − ∠
Bus
GUID-1B5A128E-E351-4847-93C8-6664FF822FE9 V1 EN
∠V Measured bus voltage phase angle
Bus
∠V Measured line voltage phase angle
Line
f Measured bus frequency
Bus
f Measured line frequency
line
T Total circuit breaker closing delay, including the delay of the protection relay output contacts defined
CB
Closing time of CB setting parameter value
with the
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 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.
( f f T
) ( ) (
° + − ×
Line Bus line CB
1MAC059074-MB A
T 360 )
)
+ × °
PL
Technical Manual
(Equation 170)
615 series ANSI