ABB Switzerland Ltd REG 316*4 1MRB520049-Uen / Rev. F
3-28
g
defines the basic setting g of the operating characteristic.
v
defines the pick-up ratio v of the operating characteristic.
b
defines the value b of the operating characteristic. This
should be set to approx. 1.5 times rated current.
g-High
High-set basic setting which replaces the normal basic set-
ting when activated by the HighSetInp input.
It is used to prevent false tripping due, for example, to ex-
cessive flux (overfluxing).
I-Inst
Differential current, above which tripping takes place regard-
less of whether the protected unit has just been energised or
not. This enables the time required to trip to be shortened for
high internal fault currents.
InrushRatio
Ratio of 2nd. harmonic current content to fundamental cur-
rent above which an inrush condition is detected.
InrushTime
Time during which the inrush detection function is active fol-
lowing initial energisation or an external fault.
a1
Amplitude compensation factor for winding 1.
s1
Connection of winding 1 (primary)
Settings provided:
· Y: star-connected
· D: delta-connected
CurrentInp1
defines the c.t. input channel for winding 1.
The first channel (R phase) of the two groups of three
phases must be specified.
a2
Amplitude compensation factor for winding 2.
To Next Page
Loading...
