Directional Inverse Time Overcurrent Protection - ABB REG316 4 Series Operating Instructions Manual

REG 316*4 1MRB520049-Uen / Rev. F
3.5.8.

Directional inverse time overcurrent protection

(DirCurrentInv)
A. Application
Directional overcurrent function for
· detecting phase faults on ring lines
· detecting phase faults on double-circuit lines with an infeed at
one end
· backup protection for a distance protection scheme.
B. Features
· directionally sensitive three-phase phase fault protection
· operating characteristics
British Standard B.S.142:
c = 0.02 :
c = 1
c = 2
· insensitive to DC component
· insensitive to harmonics
· voltage memory feature for close faults.
C. Inputs and outputs
I. C.t./v.t. inputs
· current
· voltage
II. Binary inputs
· Blocking
· PLC receive
III. Binary outputs
· start
· start R
· start S
· start T
· forwards measurement
· backwards measurement
· tripping
(see Fig. 3.5.8.1)
normal inverse
: very inverse und long time earth fault
: extremely inverse.
ABB Switzerland Ltd
according to
3-93