Three-Phase Current Plausibility - ABB REG316 4 Series Operating Instructions Manual

REG 316*4 1MRB520049-Uen / Rev. F
3.7.2. Three-phase current plausibility (Check-I3ph)
A. Application
Checking the plausibility of the three-phase current inputs for
· monitoring the symmetry of the three-phase system
· detection of a residual current
· supervision of the c.t. input channels.
B. Features
evaluation of
·
· the sum of the three phase currents
· the sequence of the three phase currents
provision for comparing the sum of the three phase currents
·
with a residual current I/P
adjustment of residual current amplitude
·
blocking at high currents (higher than 2 x I
·
blocking of phase-sequence monitoring at low currents
·
(below 0.05 x I
insensitive to DC components
·
insensitive to harmonics.
·
C. Inputs and outputs
I. C.t./v.t. inputs:
·
·
II. Binary inputs:
·
III. Binary outputs:
·
IV. Measurements:
·
)
N
phase currents
neutral current (optional)
blocking
tripping
difference between the vector sum of the three phase
currents and the neutral current.
ABB Switzerland Ltd
)
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