ABB RED615 Technical Manual page 689

1YHT530004D05 D
615 series
Technical Manual
(
Closing angle = ∠ U
Bus
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φ Measured bus voltage phase angle
U_BUS
φ Measured line voltage phase angle
U_LINE
f Measured bus frequency
U_BUS
f Measured line frequency
U_LINE
T Total circuit breaker closing delay, including the delay of the IED output contacts defined
CB
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.
Closing
permission
SECRSYN
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Figure 365: A simplified block diagram of the Synchro check function in the
continuous mode operation
(
) (
− ∠ U ° + f − f
Line Bus line
Closing
command
CBXCBR
Section 9
Control functions
)
) ( )
× T + T × 360 °
CB PL
I
(Equation 88)
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