ABB REG316 4 Series - Directional Inverse Time Overcurrent Protection

REG 316*4 1MRB520049-Uen / Rev. F ABB Switzerland Ltd
3-93
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 (see Fig. 3.5.8.1) according to
British Standard B.S.142:
c = 0.02 : normal inverse
c = 1 : very inverse und long time earth fault
c = 2 : extremely inverse.
· 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