Areva MiCom P120, Technical Manual

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P12x/EN CM/A96 Commissioning and Maintenance
Page 10/18
MiCOM P120/P121/P122/P123
4.3 Phase overcurrent (I> and I>>)
Set the various thresholds on the trip output (refer to User Guide). For MiCOM P120 , the
same test can be performed for the phase/or earth threshold.
4.3.1 Test wiring diagram
This test wiring diagram makes it possible to conduct tests relating to the I> and I>>
thresholds.
The diagram describes current injection onto the 5 Amp phase current inputs (terminals 41-
42, 43-44, 45-46). To carry out injection for the 1 Amp phase inputs, perform the same test
on the 1 Amp inputs (terminals 49-50, 51-52, 53-54).
MiCOM
P121
33
34
Case earth
29
-
RS 485 communication port
31
32
+
-
30 *
Watchdog
Programmable output
WD
35
36
2
4
6
8
10
12
RL1
RL2
Trip output
INJECTION
TEST SET
CURRENT
1 A
CURRENT
5 A
N
A
N
A
AUXILIARY
SUPPLY
+Uaux
-Uaux
TIMER
Stop
49
50
51
52
53
54
41
42
43
44
45
46
5 A
5 A
5 A
1 A
1 A
1 A
P0044ENa
FIGURE 4: I> AND I>> TESTS WIRING
4.3.2 MiCOM settings
4.3.2.1 MiCOM P120 Settings
Protection Menu
I
e
> YES
I
e
> 1 In
tI
e
> DMT or IDMT or RI
tI
e
> (if DMT) 20 s
Type of curve (if IDMT) IEC VI or IEEE VI
TMS value (if IDMT) 1
K value (if RI) 1
I
e
>> YES
I
e
>> 12 In
tI
e
>> 10 s