IdMin: The setting gives the minimum operation value. The setting is in percent of the
IBase value. The neutral current must always be larger than half of this value. A
normal setting is 30% of power transformer-winding rated current for the solidly
grounded winding.
CTFactorPri1: A factor to allow a sensitive function also at multi-breaker arrangement
where the rating in the bay is much higher than the rated current of the transformer
winding. The stabilizing can then be high so an unnecessary high fault level can be
required. The setting is normally 1.0 but in multi-breaker arrangement the setting shall
be CT primary rating/IBase.
CTFactorPri2: A factor to allow a sensitive function also at multi-breaker arrangement
where the rating in the bay is much higher than the rated current of the transformer
winding. The stabilizing can then be high so an unnecessary high fault level can be
required. The setting is normally 1.0 but in multi-breaker arrangement the setting shall
be CT primary rating/IBase.
CTFactorSec1: See setting CTFactorPri1. Only difference is that CTFactorSec1 is
related to W2 side.
CTFactorSec2: See setting CTFactorPri2. Only difference is that CTFactorSec2 is
related to W2 side.
3.5.2.3 Setting parameters
Table 42: REFPDIF (87N) Group settings (basic)
Name
Values (Range) Unit Step Default Description
Operation Disabled
Enabled
- - Disabled Disable/Enable Operation
IBase 1 - 99999 A 1 3000 Base current
IdMin 4.0 - 100.0 %IB 0.1 10.0 Maximum sensitivity in % of IBase
CTFactorPri1 1.0 - 10.0 - 0.1 1.0 CT factor for HV side CT1 (CT1rated/
HVrated current)
CTFactorPri2 1.0 - 10.0 - 0.1 1.0 CT factor for HV side CT2 (CT2rated/
HVrated current)
CTFactorSec1 1.0 - 10.0 - 0.1 1.0 CT factor for MV side CT1 (CT1rated/
MVrated current)
CTFactorSec2 1.0 - 10.0 - 0.1 1.0 CT factor for MV side CT2 (CT2rated/
MVrated current)
Table 43: REFPDIF (87N) Group settings (advanced)
Name
Values (Range) Unit Step Default Description
ROA 60 - 90 Deg 1 60 Relay operate angle for zero sequence
directional feature
1MRK504116-UUS C Section 3
IED application
133
Application manual
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