Basler BE1-CDS220, Instruction Manual

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12-18 Installation BE1-CDS220
P0001-10
09-26-00
1
2
3
1
B2
B5
B1
B3
B6
B4
I
C1
I
B1
I
A1
1
B10
B14
B12
B9
I
A2
I
B2
I
C2
B13
B11
3
4
H1 H2 H3
X1 X2 X3
Primary
4
3
4
5
Secondary
BE1-CDS220
2
B7
B8
I
G
Tertiary
I
0
*
AØ
BØ CØ
Y1
Y2
Y3
AØ
BØ
CØ
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 ground input (
I
G
)connected to one CT inside the delta (
I
o
) to protect an unloaded
tertiary winding and provide overcurrent backup protection for system ground faults. A loaded tertiary
requires the application of a three input current differential scheme.
Phase, Residual, and
I
2
overcurrent elements can be connected to either CT circuit for backup
protection. For more information on applying overcurrent backup, refer to Section 8, Application.
Overcurrent neutral ground (
I
N
) operates on internally calculated residual (3
I
0
) current.
For complete metering and independent backup protection, add a BE1-951 Overcurrent Protection
System 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.
When
I
G
is connected with a single CT inside the delta,
I
G
senses
1I
O
. When
I
G
is connected per the
alternate connection,
I
G
senses
3I
O
.
Alternate Connection
6
6
Y1 Y2
Y3
Figure 12-21. Differential Protection for High and Low Side Windings with Optional Independent Ground
Input Connected to Protect Unloaded Tertiary Winding