ABB RELION REX640 - Page 1600

Source
2
ASNSCSYN
(NSCB2)
ASCGAPC
ASGCSYN
(SCB2)
ASGCSYN
(SCB1)
Synchronize
Bus2
ASNSCSYN
(NSCB3)
ASCGAPC
ASNSCSYN
(NSCB1)
ASCGAPC
ASCGAPC
ASCGAPC
∆U, ∆F
∆U, ∆ F
Matching Start
Bus1
Source
1
NS_ASC_DAT
NS_ASC_DAT
Figure 879: NSCB2 synchronization
In this application example, breaker NSCB2 must be closed. So the synchronizing
conditions between Bus1 and Bus2 are checked by ASNSCSYN. ASNSCSYN sends
the auto synchronization request and the voltage and frequency difference (ΔU, ΔF)
between Bus1 and Bus2 to ASCGAPC.
ASCGAPC transfers the voltage and frequency difference sent by ASNSCSYN to
the selected ASCGAPC function of source 1 ASGCSYN function. It also sends the
permission to the source to start matching the voltage and frequency. The matching
process is carried out so that the voltage and frequency difference between Bus1
and Bus2 measured by ASNSCSYN reduces and comes within the synchro check
limits. This satisfies the synchro check conditions for breaker NSCB2 which can then
be synchronized by ASNSCSYN. Similarly, the synchronization of NSCB1 and NSCB3
having ASCGAPC is done as shown in Figure 880 and Figure 881 .
ASNSCSYN
(NSCB2)
ASGCSYN
(SCB2)
ASGCSYN
(SCB1)
Bus1
Bus2
ASCGAPC
ASNSCSYN
(NSCB1)
ASCGAPC
ASNSCSYN
(NSCB3)
Synchronize
ASCGAPC
ASCGAPC
ASCGAPC
∆U, ∆F
∆U, ∆ F
Matching Start
Source
2
Source
1
NS_ASC_DAT
Figure 880: NSCB1 synchronization
Control functions
1MRS759142 F
1600 REX640
Technical Manual