Woodward HighPROtec MCDLV4, Manual

Page: 643 / 1275

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
643 MCDLV4 DOK-HB-MCDLV4-2E
Id
h
ig
h
_Z
0
1
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
Slop
e1
Sl
op
e2