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Line differential protection (DIFL)
Test/TestMode/DisturbReport
5.
Activate the trip by setting Release local.
This command is found in the menu under:
Test/TestMode/Differential
This command must be saved in order to be activated. Observe that
the command ReleaseLocal will allow the trip outputs to be acti-
vated during the tests.
6.
Inject a current in L1 and increase the current until operation
in phase L1 and L2 takes place.
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:
Service Report/Functions/Differential/Diff Values
7.
Repeat step 6 for phase L2 and L3.
The result shall be transposed one, respectively two steps.
8.
Inject a symmetrical three-phase current, and increase the
current until operation is achieved in all three phases.
The IMinOp·Ir·CTFactor value shall be obtained for operation and
read for I
in all three phases. 100% of I
Diff
in all three phases.
9.
Read the transmission delay on the HMI.
This command is found in the menu under:
Service value/Functions/Differential/DiffCom/ComInfo
This delay is not allowed to exceed 12 ms.
Verifying settings by secondary
shall be read for I
Diff
Bias
Chapter 11
injection
87
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