Application Example 2 - ABB SPAU 140 C User Manual And Technical Description

Application
example 2
Synchronism check
between busbar and
line
10
13
63 14 15 16 17 18 19 20 21
100V 100V 100V
110V 110V 110V
X3
U1 U2 U3
SPAU 140 C
Fig. 5. Synchro-check relay SPAU 140 C used for checking synchronism between busbar and line
In the application illustrated in Fig. 5 stage 1 of
the synchro-check relay is used for checking the
synchronism between the busbar and the line.
Stage 2 is inactive (SGF/7 = 0 and SGF/8 = 0).
Both the synchro-check function and the volt-
age-check function of stage 1 are operational
(SGF/3 = 1 and SGF/4 = 1).
Command mode operation has been selected
for stage 1 (SGB/3 = 1), which means that press-
ing a push-button activates a request signal for
the synchro-check relay to close the circuit
breaker. This request signal should be active
throughout the specified checking time. The
permission for the relay to operate is given over
this request input, and once the conditions for
CB closing are met, the synchro-check relay de-
livers a close signal to the circuit breaker via out-
put contact C. Should the attempt to close the
circuit breaker fail (SGR/1 =1), that is, the cir-
I
BS13 BS23 CS13 CS23
10 11 62 61
22 23 45 46 47 48
X2
U1
SC13
U3
BS13
VC13
SGB/1 CS13
SGB/3
U2
U3 SC23
BS23
SGB/2 VC23
CS23
SGB/4
cuit breaker is not closed within the preset time,
an alarm signal will be received through con-
tact A.
A blocking voltage applied to the blocking in-
put BS13 (SGB/1=1) over the auxiliary contact
of the miniature circuit breaker prevents the
synchro-check relay from performing the volt-
age-check function when the miniature circuit
breaker trips. It is very important that the volt-
age-check function is prevented by the tripping
of the m.c.b. Unless a blocking signal has been
provided, the synchro-check relay measures the
voltage over this input to be zero and, should
the energizing conditions then correspond to
the setting concerned (SGF/1 and SGF/2), it
gives a close signal to the circuit breaker, when
the command input (push-button depressed) is
active.
L1
L2
L3
I
Uaux
IRF CB13 CB23 ALARM
70 71 72
85 86 87 88 68 69
B A
D C
1
1
IRF
CB13
T1
NC13
SGR/1
CSF13
SGR/3
CB23
T2
NC23
SGR/5
CSF23
SGR/7
I/O
Rx Tx
SPA-ZC_
SERIAL
PORT
T3
T5
T4
T6
X1