ABB RET670 Product Manual page 7

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
&CB1/2/3
Figure 3. A typical protection application for a three 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>
25
SC/
59
VC
3U>
2
2
27
3U<
2
2
IEC05000274 V1 EN
1MRK 504 091-BEN B
Issued: June 2010
CB1
50BF
TRIP BUSBAR
3I>
&CB1/2
3I>
4
4
94/86
TRIP
I->O
CB3
CB2
59N
UN>
2
t2
2
en05000274.vsd
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