breaker closing delay. The phase angle advance is calculated continuously with the
formula.
Closing angle
V
V
f
f
T
T
Bus
Line
Bus
line
CB
PL
=
∠
− ∠
(
)
° +
−
(
)
×
+
(
)
×
°
(
)
360
GUID-1B5A128E-E351-4847-93C8-6664FF822FE9 V1 EN
(Equation 170)
∠V
Bus
Measured bus voltage phase angle
∠V
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 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.
Section 9
1MAC059074-MB A
Control functions
980
615 series ANSI
Technical Manual
Summary of Contents for Relion 615 series
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