41
Figure 13 Block diagram: biased differential protection relay Type MBCH12 with two biased inputs
23
24
25
26
T3
RL1
2
Output
circuits
RL2
1
1
3
5
RL1–1
2
4
6
RL1–2
10
13
14
12
9
11
RL2–1
12
34
56
78
910
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
Module terminal
block viewed
from rear
Case earth
Input circuits
Reset
Bias
(see Note 2)
Trip
other
phases
V
x
Trip
output
Alarm
See following sheets
2
1
2. Terminal 12 on each phase assembly should
be interconnected by a screened lead GJ0153 001
with the screen connected to terminal 14.
Notes:
1. (a) CT shorting links make
before (b) and (c) disconnect.
(b) Short terminals break before (c).
(c) Long terminals.
27
28
T1
T2
Input circuits
See following sheets
DIFF
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