ABB RET670 Product Manual page 6

Transformer protection RET670 ANSI
Pre-configured
Product version: 1.2
Trip from 50-BF1,
50-BF2
49
TRIP BKR1
94/86
50/51P
50/51G
TRIP BKR2
94/86
87N
87T
87N
50/51G
50/51P
TRIP BKR3
94/86
TRIP BKR4
94/86
59P
27P
59N
60
Trip from 50-BF3,
50-BF4
81U
81O
81R
ANSI10000088 V3 EN
Figure 2. A typical protection application for a two winding transformer in multi breaker arrangements is shown on the
figure. The system grounding principle and connection group will vary which gives different detailed
arrangements for each application. Breaker failure function is here provided for each breaker.
6
50/51N
50BF2
50BF1
50BF4
50BF3
50/51N
24
1MRK 504 118-BUS A
CT6
CT7
BKR3
CT3
VT's from MV side of XFRM
ANSI10000088-3-en.vsd
CT2
CT1
BKR1
BKR2
WDG1
WDG2
BKR4
CT4
ABB