H
2
H
1
H
3
C
B
A
X
2
X
1
X
0
X
3
C
B
A
A13
A14
A9
A11
A7
A8
A5
A6
*
BE1-CDS240
*An alternative to grounding one corner of the delta connected CTs is
to connect the ground to a lead connected to terminal A10, 12, or 14.
P0017-03
02-28-03
A4
A3
A12
A10
Figure 1-5. Three-Phase Connections, Delta-Wye Configuration, CT Compensation
There are several drawbacks to the traditional solution:
The delta connection requires a dedicated set of CTs that generally cannot be used for other
purposes.
The delta connection is more difficult to test.
The delta-connected CTs experience greater burden than wye-connected CTs because the lead
burden must be multiplied by a factor of three in the CT performance calculation.
The BE1-CDS240 relays support the traditional solution so that they may be used in retrofit/modernization
projects. However, in a numerical relay, it is possible to connect all of the CTs in wye as shown in Figure
1-6 so that the drawbacks mentioned above are not a consideration. The BE1-CDS240 relay can
numerically combine currents internally to accomplish a numerical delta if required for phase angle
compensation.
The setup parameters for each of the current input circuits are described in Section 3,
Input and Output
Functions, Power System Inputs
. The CT connection and the transformer connection are included to
allow the BE1-CDS240 relay to automatically determine the appropriate combination of currents to
present to the differential protection function.
1-12
BE1-CDS240 General Information
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Summary of Contents for BE1-CDS240
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