Connection Examples - NR Electric PCS-9611 Instruction Manual

NOTE! If the NR4422-4I4U module is adopted, the No.2 zero sequence overcurrent
protection, the sensitive earth fault protection and the zero sequence overvoltage
protection will be disabled automatically, and the relevant information will be hidden.

6.6.1 Connection Examples

Some connection examples of the current transformers and voltage transformers which are
supported by this relay are shown in this section. If one of the analog inputs has no input in a
practical engineering, the relevant input terminals should be disconnected.
1. Current connections examples
A B C
A B C
Where:
(1) Current connections to three current transformers with a star-point connection for ground
current (zero sequence current or residual current).
(2) Current connections to three current transformers with a separate ground current
transformer (summation current transformer or core balance current transformer) .
(3) Current connections to two current transformers with a separate ground current
transformer (summation current transformer or core balance current transformer) , only
for ungrounded or compensated networks.
(4) Current connection to a core balance neutral current transformer for sensitive ground
fault detection, only for ungrounded or compensated networks.
PCS-9611 Feeder Relay
11 Ia
12 Ian
13 Ib
14 Ibn
15 Ic
16 Icn
17 I01
18 I01n
(1)
11 Ia
12 Ian
13 Ib
14 Ibn
15 Ic
16 Icn
17 I01
18 I01n
(2)
Figure 6.6-2 Current connection examples
Date: 2014-04-08
A B C
(3)
(4)
(5)
6 Hardware
11 Ia
12 Ian
13 Ib
14 Ibn
15 Ic
16 Icn
17 I01
18 I01n
19 I0s
20 I0sn
09 I02
10 I02n
6-11