Basler BE1-CDS220, Instruction Manual

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12-24 Installation BE1-CDS220
AØ
BØ
CØ
Circuit
Switcher
P0035-23
01-09-06
With the appropriate transformer and CT connection information, the relay can automatically determine
the required compensation. The relay can accommodate any combination of transformer and CT
connection (wye, delta AB, or delta AC). for more information, refer to Section 3, Input And Output
Functions, Input Current.
Optional independent groupd input (
I
G
) connected to detect low side ground faults.
Phase, Residual, and Negative-Sequence overcurrent elements can be connected to either CT circuit for
backup protectiion. For more information on applying overcurrent backup, refer to Section 8, Application.
(Residual current not available on delta connected CTs.)
Overcurrent neutral ground (
I
N
) operates on internally calculated residual (3I0) current.
For complete metering and independent backup protection, add a BE1-951 Overcurrent Protection
Element with the BE1-CDS220 (refer to Figure 12-18 for a connection diagram). To add only metering to
the BE1-CDS220, connect a BE1-MMS100.
1
2
3
1
BE1-CDS220
B2 B1
B3 B4
I
B1
I
A1
1
B10
B14
B12
B9
I
A2
I
B2
I
C2
B13
B11
3
2
X1 X2 X3
3
4
5
Bus or Line
Low Side Breaker
B5
B6
I
C1
B8
B7
I
G
4
H3 H2 H1
A B C
C-B
B-A
A-C
C-B
B-A
A-C
DAB
A
B
C
C
A B
Figure 12-27. Differential Protection of DAC-WYE Grounded Transformer with Y-D CT’s and Optional
Independent Ground Input Connected for Low Side Ground Fault Protection