ABB REG316 4 Series - Directional Definite Time Overcurrent Protection

REG 316*4 1MRB520049-Uen / Rev. F ABB Switzerland Ltd
3-85
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
of the three phase currents (I
R
, I
S
, I
T
)
· active power
A positive measurement indicates the forwards direction
(I
R
* U
ST
, I
S
* U
TR
, I
T
* U
RS
)
· voltage amplitude
Amplitudes of the phase-to-phase voltages
(U
ST
, U
TR
, U
RS
).