ABB RELION REX640 Technical Manual page 1419

1MRS759142 C
REX640
Technical Manual
2("Fixed MW'), respectively. If the command parameter AVR mode change is set to
"Droop" or "Fixed MVAr", the function activates the binary output AVR_DROOP and
sets integer output MOD_CHG_AVR to 9("Droop") or 11("Fixed MVAr"),
respectively.
Matching for own generator CB
If the command 'Synchronize CB' is set to "TRUE" or input CL_COMMAND is TRUE,
the generator CB is selected for synchronizing. For the voltage and frequency
matching to start, the generator CB should be in open position and Synchrocheck mode
should be set to "Asynchronous".
The measured voltage difference U_DIFF_MEAS is used for generating AVR raise or
lower pulses to match the voltages across the CB. The measured frequency difference
FR_DIFF_MEAS is used for generating governor raise or lower pulses to match the
frequencies across the CB. The voltage and frequency matching starts only when the
ENERG_STATE is "Both Live".
Voltage difference (ΔU) = U_DIFF_MEAS
Frequency difference (ΔF) = FR_DIFF_MEAS
Matching for network CB
The generator is ready for network CB matching only when the generator CB is
closed, the protection relay is in remote mode and the generator is requested for
matching from non-source function.
After receiving the acknowledgement from ASGCSYN, the autosynchronizer co-
ordinator function ASCGAPC gives permission to participate in the voltage and
frequency matching across the CB to be synchronized in the network. ASCGAPC also
shares the information about how many generators participate in the voltage matching
(NgV) and frequency matching (NgF). Depending on the number of participating
generators, the voltage and frequency difference is divided among the generators.
The voltage and frequency difference calculated for generating raise or lower pulses
for AVR and governor are
Voltage difference (ΔU) = DIFF_U_ASC1 / NgV
Frequency difference (ΔF) = DIFF_F_ASC1 / NgF
The sign bit for voltage difference and frequency difference is decided based on the
data received from ASCGAPC. The calculated voltage difference and frequency
difference are available in the Monitored data view U_DIFF_NTW and
FR_DIFF_NTW, respectively.
Voltage matching
Working range of the voltage matcher
Section 9
Control functions
1413