ABB Relion 670 Series Applications Manual page 71

1MRK 511 401-UEN Rev. K
IEC06000196 V2 EN-US
Figure 11:
For busbar protection, it is possible to set the
The first solution will be to use busbar as a reference object. In that case for all CT inputs
marked with 1 in Figure 11, set
Figure 11, set
The second solution will be to use all connected bays as reference objects. In that case for all
CT inputs marked with 1 in Figure 11, set
marked with 2 in Figure 11, set
Regardless which one of the above two options is selected, busbar differential protection will
behave correctly.
The main CT ratios must also be set. This is done by setting the two parameters
CTprim for each current channel. For a 1000/1 A CT, the following settings shall be used:
CTprim = 1000 (value in A)
•
CTsec = 1 (value in A).
•
Bay control REC670
Application manual
Example how to set CTStarPoint parameters in the IED
CTStarPoint = ToObject , and for all CT inputs marked with 2 in
CTStarPoint = FromObject .
CTStarPoint = ToObject .
© Copyright 2017 Hitachi Power Grids. All rights reserved
Busbar
Busbar
Protection
1
IED
2
CTStarPoint parameters in two ways.
CTStarPoint = FromObject , and for all CT inputs
Section 4
Analog inputs
2
1 1
en06000196.vsd
CTsec and
65