ABB RELION 670 Series Applications Manual page 106

Section 6
Differential protection
N.O.
N.C.
IEC06000084 V1 EN-US
Figure 40: Scheme_1 RADSS
N.O.
N.C.
IEC06000085 V1 EN-US
Figure 41: Scheme2_INX
Circuit breaker replica
The circuit breaker position from a bay shall be given to the busbar protection when the position
of this particular breaker can influence the busbar protection operation. Typical examples are
Blind Spot protection in Bus-section and Bus-coupler bays or End Fault Protection in feeder bays.
In both cases the measuring range of a busbar protection is limited by the CT location. By
additionally recording the CB position of a feeder or a coupler the zone between the CT and the CB
can be better protected while CB is open. However in such cases it is of utmost importance to
connect the CB closing command to the busbar protection in order to include again the CT current
to the busbar protection zones in time. It is as strongly recommended to always use
Scheme1_RADSS for all CBs positions connected to the IED in order to minimize any risk of
possible problems due to late inclusion of CT current to the relevant differential zones.
100
closed
open
BBP
1
input „closed"
0
1
input „open"
0
current
1
assignment
0
1) disconnector supervision running
closed
open
BBP
1
input „closed"
0
1
input „open"
0
current
1
assignment
0
1) disconnector supervision running
2) BI „closed" should change before arcing distance
arcing possible
1) 1)
en06000084.vsd
arcing possible
2)
1)
1)
en06000085.vsd
1MRK 505 337-UUS A
SEMOD127523-79 v3
Application manual