Underimpedance - ABB REG316 4 Series Operating Instructions Manual

REG 316*4 1MRB520049-Uen / Rev. F
3.5.13. Underimpedance (Underimped)
A. Application
Back-up phase fault protection for the generator feeder.
B. Features
· circular operating characteristic
· adjustable time delay
· insensitive to DC component in voltage and current
· insensitive to harmonics in voltage and current
· single or three-phase measurement
· detection of the lowest impedance in the three-phase mode
· underimpedance measurement enabled by undercurrent unit
(0.1 I
C. Inputs and outputs
I. Analogue inputs:
· current
· voltage
II. Binary inputs:
· blocking
III. Binary outputs:
· pick-up
· tripping
IV. Measurements:
· impedance (value).
).
N
ABB Switzerland Ltd
(see Fig. 3.5.13.1)
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