ABB RELION REX640 Technical Manual page 1412

Section 9
Control functions
1406
Table 1357: Typical delays for different output types
Output type
Semiconductor output (SPO)
Mechanical relay output (POSP,
PODP)
The Minimum Syn time setting defines the minimum time for which synchro check
conditions must be simultaneously fulfilled.
ASGCSYN can be set to the bypass mode by setting the parameters
Synchrocheck mode and Live dead mode to "Off" or, alternatively, by
activating the BYPASS input. In the bypass mode, the synchro check
conditions are always fulfilled. Otherwise, the operation is similar to
the normal mode.
The frequency slip acceleration (ds/dt) FR_SLIP_ACCL is the average value of
frequency slip difference (Δs) calculated over a time period of 0.5 s.
f
(
Gen
Frequency slip(s) =
GUID-013F4060-1B6A-42D1-AA50-DCFF86F4C677 V1 EN
The measured bus voltage (U
generator frequency(f
Gen
the circuit breaker are available as monitored data values U_BUS_MEAS,
FR_BUS_MEAS, U_GEN_MEAS, FR_GEN_MEAS, U_DIFF_MEAS,
FR_DIFF_MEAS and PH_DIFF_MEAS. The calculated frequency slip acceleration
(ds/dt) is available as monitored data value FR_SLIP_ACCL. 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 setting
Synchrocheck mode is set to "Asynchronous" and the measured ENERG_STATE is
"Both Live".
The measured voltage, frequency are updated in the monitored data irrespective of any
condition.
Close CB condition
When Synchrocheck mode is set to "Asynchronous", the close CB condition is
generated as explained below.
From the frequency slip s, the acceleration ds/dt, the bus frequency FR_BUS_MEAS
(f ) and the set Closing time of CB, the function calculates the necessary lead angle
Bus
Recommended value for T
Generator voltage measurement:
Non-Adaptive
Bus voltage measurement: Non-
Adaptive
16 ms
23 ms
f
)
−
Bus
f
Bus
), bus frequency (f
Bus
) and phase angle difference values between the two sides of
1MRS759142 C
PL
Generator voltage measurement:
Adaptive
Bus voltage measurement: Non-
Adaptive
7 ms
13 ms
(Equation 323)
), generator voltage (U
Bus
Technical Manual
),
Gen
REX640