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ABB Substation Automation
Products and Systems
2.1
1MRS750613-MUM
User's Guide
Note!
The current carrying capacity of the wiring, terminals and measuring transformers of
the relay is limited, see chapter "Technical data".
N
L1
S1
TIMER START
A
See text!
X1.1
1 2 3 4 5 6 7 8 9
Figure 2-1 Secondary injection test circuitry for the overcurrent relay
When the test circuit has been completed and the switchgroups set, the auxiliary
voltage may be connected to the relay. The operation of the test circuit can be verified
with the aid of a multimeter.
Testing of the phase current measuring transformers
Test each used 1 A or 5 A current transformer input separately. Apply a pure
sinusoidal voltage to the relay and compare the current value read from the relay via
serial communication with that shown by the ammeter. The measurements can be
made, for instance, at the rated current of the relay. Note that the relay shows the
measured current as a multiple of the rated current I
L1
S2
BI
U aux
IRF
X2.1
13 14 15
17 18
1
2
+
~
+
IRF
SGR1
START
3I>
SGB1
SGR2
5
Blocking of stage I>
TRIP
SGR3
START
3I>>
SGB1
SGR4
6
Blocking of stage I>>
TRIP
INDICATORS RESET
SGB1
1
RELAYS & IND. RESET
SGB1
2
I/O
MEMORIZED VALUES
SGB1
3
RESET
+ (~)
- (~)
L2
L3
TIMER STOP
SO2
SO1
PO2
PO1
10 11 12
7
8
9
5 6
3 4
+
4
x
2
4
3
2
x
3
2
4
3
2
of the energizing input used.
n
REJ 513
PC
+
Optical
PC-interface
1
x
1
1
63
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