REG 316*4 1MRB520049-Uen / Rev. F ABB Switzerland Ltd
3-261
Trip1
defines the tripping channel activated by the tripping output
of stage 1 of the function (tripping logic).
ZA
Forwards impedance
1)
. ZA marks the end of zone 2 and is
also used for determining phase-angle.
ZB
Reverse impedance
1)
. ZB marks the beginning of zone 1 and
is also used for determining phase-angle.
ZC
Impedance of the zone limit
1)
. ZC is the end of zone 1 be-
tween ZB and ZC and the beginning of zone 2 between ZC
and ZA.
Phi
Angle of the slipping characteristic and of ZA, ZB and ZC. Phi
also determines the energy direction:
60°...90° c.t. neutral on the line side
240°...270° c.t. neutral on the generator side.
WarnAngle
Rotor angle above which alarm of potential slipping is given
(rotor angle > WarnAngle).
TripAngle
Rotor angle below which first ‘Trip1’ and the ‘Trip2’ are is-
sued (rotor angle < TripAngle).
1)
The impedance unit 1.000 UN/IN represents an impedance of 100%. Thus if the imped-
ance setting in percent is known, it can be set directly, e.g. the setting for 10% is 0.100.
An impedance of 1.000 UN/IN corresponds to a current of 1 I
N
at the rated phase-to-
neutral voltage
U
N
/ 3 in all three phases. The respective positive-sequence impedance
is
UI
NN
//3:
U
N
I
N
Impedance unit
100 V 1 A 57.735 W/ph
100 V 2 A 28.868
W/ph
100 V 5 A 11.547
W/ph
200 V 1 A 115.470 W/ph
200 V 2 A 57.735
W/ph
200 V 5 A 23.094
W/ph
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