Protective Elements
Unrestrained High-set Differential Current Protection IdH
Elements:
IdH
Irrespective of the set static tripping characteristic and restraining factors d[H,m], a pickup value for a max.
differential current IdH can be adjusted and results in undelayed tripping when exceeded. This protection step is
referred to as high-set differential step IdH and only trips on faults within the protection zone.
Unrestrained High-set Differential Protection Step IdH
656 MCDGV4 DOK-HB-MCDGV4-2E
Idhigh_Z01
Highset Differential Current
Protection/Unstabilized high-
phase fault: Pickup value of the
differential current based on the
rated current Ib of the
protection object.
Id[Is2]
Id[Is1]
Id[Is0]
Id min
Id/Ib
IdH
Is1= 2
⋅
Ib Is2= 10
⋅
Ib
Is/Ib
Trip Range
Operating Range
S
l
o
p
e
1
Slop
e2
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