ABB RET670 Product Manual page 6

Transformer protection RET670
Pre-configured
Product version: 1.1
94/86
TRIP CB1
I->O
94/86
TRIP CB2
I->O
94/86
TRIP CB3
I->O
TRIP BUSBAR
&CB1/2
Figure 2. A typical protection application for a two winding transformer in multi breaker
arrangements is shown on the figure. The system earthing principle and connection
group will vary which gives different detailed arrangements for each application.
Breaker failure function is here provided for each breaker.
6
TRIP BUSBAR&CB2
50BF
51/67
S
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>
25
SC/VC
59
3U>
2
2
27
3U<
2
2
IEC05000273 V1 EN
1MRK 504 091-BEN B
TRIP CB1/3
CB1
3I>
CB3
Issued: June 2010
50BF
3I>
CB2
en05000273.vsd
ABB