IN>
4
4
3U>
2
2
3U<
2
2
I->O
51/67
51N/67N
59
27
94/86
87T
3Id/I>
IdN/I>
87N
IdN/I>
87N
3I>
50BF
3I>
4
4
IN>
4
4
51N/67N
SC/VC
25
51/67
3I>
50BF
3I>
4
4
I->O
94/86
TRIP BUSBAR&CB2
TRIP BUSBAR
&CB1/2
CB3
TRIP CB3
CB1
TRIP CB1
CB2
S
3I>
50BF
TRIP CB1/3
I->O
94/86
TRIP CB2
en05000273.vsd
IEC05000273 V1 EN
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.
Transformer protection RET670
1MRK 504 091-BEN B
Pre-configured
Product version: 1.1
Issued: June 2010
6
ABB