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

REG 316*4 1MRB520049-Uen / Rev. F
3.5.7.

Directional definite time overcurrent protection

(DirCurrentDT)
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
· 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
IV. Measurements
· current amplitude
· active power
· voltage amplitude
of the three phase currents (I
A positive measurement indicates the forwards direction
(I * U , I * U , I
R ST S TR
Amplitudes of the phase-to-phase voltages
(U , U , U ).
ST TR RS
, I , I )
R S T
* U )
T RS
ABB Switzerland Ltd
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