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

REG 316*4 1MRB520049-Uen / Rev. F
3.7.3. Three-phase voltage plausibility (Check-U3ph)
A. Application
Checking the plausibility of the three-phase voltage inputs for
detection of residual voltage
·
monitoring the asymmetry of the three-phase voltage system
·
due to the zero-sequence component
supervision of the v.t. input channels.
·
B. Features
Evaluation of
·
·
provision for comparing the sum of the three phase voltages
·
with a residual voltage I/P
adjustment of residual voltage amplitude
·
blocking at high voltages (higher than 1.2 ´ U
·
blocking of phase-sequence monitoring at low voltages
·
(below 0.4 ´ U
insensitive to DC components
·
insensitive to harmonics.
·
Evaluation of the phase voltages is only possible in the case of Y
connected input transformers, otherwise the residual component
cannot be detected.
C. Inputs and outputs
I. C.t./v.t. inputs:
· phase voltages
· neutral voltage (optional)
II. Binary inputs:
· Blocking
III. Binary outputs:
· tripping
IV. Measurements:
· Difference between the vector sum of the three phase
the sum of the three phase voltages
the sequence of the three phase voltages
phase-to-phase)
N
voltages and the neutral voltage.
ABB Switzerland Ltd
)
N
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