ABB RET670 Product Manual page 5

ABB
Transformer protection RET670
Pre-configured
Product version: 1.1
TRIP BUSBAR
94/86
TRIP CB1
I->O
94/86
TRIP CB2
I->O
TRIP BUSBAR
Figure 1. A typical protection application for a two winding transformer in single breaker
arrangements is shown on the figure. The system earthing principle and connection
group will vary which gives different detailed arrangements for each application.
50BF
3I>
51/67
3I>
4
4
51N/67N
IN>
4
4
87N
IdN/I>
87T
3Id/I>
87N
IdN/I>
51N/67N
IN>
4
4
51/67
3I>
4
4
50BF
3I>
59
3U>
2
2
27
3U<
2
2
IEC05000272 V1 EN
1MRK 504 091-BEN B
Issued: June 2010
25
SC/VC
CB1
CB2
en05000272.vsd
5