ABB REL 551 2.3 Series - Page 107

101
Line differential protection (DIFL) &KDSWHU
9HULI\LQJVHWWLQJVE\VHFRQGDU\
LQMHFWLRQ
7HVW7HVW0RGH'LVWXUE5HSRUW
 $FWLYDWHWKHWULSE\VHWWLQJ5HOHDVHORFDO
This command is found in the menu under:
7HVW7HVW0RGH'LIIHUHQWLDO
This command must be saved in order to be activated. Observe that
the command 5HOHDVH/RFDO will allow the trip outputs to be acti-
vated during the tests.
 ,QMHFWDFXUUHQWLQ/DQGLQFUHDVHWKHFXUUHQWXQWLORSHUDWLRQ
LQSKDVH/DQG/WDNHVSODFH
The injected operation value must correspond to the set IMinOp·
Ir·CTFactor. This value is to be read as IDiffL1 and IDiffL2, and
50% of IDiffL1 as IBiasL1 and IBiasL2. The IDiffL3 should be
zero and IBiasL3 25% of IDiffL1. These values are read on the
HMI under:
6HUYLFH5HSRUW)XQFWLRQV'LIIHUHQWLDO'LII9DOXHV
 5HSHDWVWHSIRUSKDVH/DQG/
The result shall be transposed one, respectively two steps.
 ,QMHFWDV\PPHWULFDOWKUHHSKDVHFXUUHQWDQGLQFUHDVHWKH
FXUUHQWXQWLORSHUDWLRQLVDFKLHYHGLQDOOWKUHHSKDVHV
The IMinOp·Ir·CTFactor value shall be obtained for operation and
read for I
Diff
in all three phases. 100% of I
Diff
shall be read for I
Bias
in all three phases.
 5HDGWKHWUDQVPLVVLRQGHOD\RQWKH+0,
This command is found in the menu under:
6HUYLFHYDOXH)XQFWLRQV'LIIHUHQWLDO'LII&RP&RP,QIR
This delay is not allowed to exceed 12 ms.