ABB RET670 Product Manual page 7

ABB
Transformer protection RET670 ANSI
Pre-configured
Product version: 1.2
Trip from 50-BF1,
50-BF2
TRIP
BKR5
94/86 50/51N
94/86
49
TRIP
50/51P
BKR1
94/86
94/86
67P
TRIP
BKR2
94/86
87T
87N
50/51G
50/51P
TRIP
BKR3
94/86
TRIP
50/51N
BKR4
59P
94/86
27P
59N
60
24
Trip from 50-BF3,
50-BF4
ANSI10000089 V3 EN
Figure 3. A typical protection application for a three 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.
50/51P 50BF5
50BF2
50BF1
50BF4
50BF3
VT's from MV side of XFRM
1MRK 504 118-BUS A
CT2
CT1
BKR1
BKR2
WDG1
CT7
WDG2
BKR4
BKR3
CT4
CT3
ANSI10000089-3-en.vsd
CT5
WDG3
7