Current Transformer Requirements - NR Electric PCS-9611 Instruction Manual

6 Hardware
(5) Current connection to a separate ground current transformer (summation current
transformer or core balance current transformer) for the No.2 zero sequence current
input of this relay.
2. Voltage connections examples
A B C
52 52 52
Where:
(1) Voltage connections to three star-connected voltage transformers with open-delta
windings and additionally to any phase voltage (for synchronism check).
(2) Voltage connections to three star-connected voltage transformers with open-delta
windings and additionally to any phase-to-phase voltage (for synchronism check).

6.6.2 Current Transformer Requirements


CT Requirements
Rated primary current "I
--
According to the rated current or maximum load current of primary apparatus
Rated continuous thermal current "I
--
According to the maximum load current
Rated short-time thermal current "I
--
According to the maximum fault current
Rated secondary current "I
--
Accuracy limit factor "K
--
I Rated primary current (amps)
pn
I Rated continuous thermal current (amps)
cth
6-12
05 Ux
06 Uxn
01 Ua
02 Ub
03 Uc
04 Un
07 U0
08 U0n
(1)
Figure 6.6-3 Voltage connection examples
":
pn
":
cth
" and rated dynamic current "I
th
"
sn
":
alf
Date: 2014-04-08
A B C
52 52 52
(2)
":
dy n
05 Ux
06 Uxn
01 Ua
02 Ub
03 Uc
04 Un
07 U0
08 U0n
PCS-9611 Feeder Relay