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PRODUCT DESCRIPTION
GEK-106273L
MIF Digital Feeder Protection
2-3
2.2
OVERCURRENT UNITS
2.2.1.
PHASE TIME OVERCURRENT UNIT (51P)
A Phase Time Overcurrent unit is provided in the MIF. The relay offers the following 4 current/time operation
characteristics: Definite Time, Inverse Curve, Very Inverse Curve and Extremely Inverse Curve. One group of curves
complies with the criteria specified in the IEC255-4 Standard and in British Standard BS142, while another group
(defined in the same unit) complies with ANSI C37.90 standards. A time dial can be applied to any of these curves to
optimize co-ordination with other devices in the net. Additionally, there is a possibility to define a User’s Curve, which
can be used for both three-phase overcurrent and ground units.
2.2.1.1. IEC
CURVES
Response times for IEC curves are as follows:
Where:
CURVE NAME
A
P
Q
B
K
Inverse (IEC Curve C)
0.14
0.02
1
0
0
Very Inverse (IEC Curve B)
13.5
1
1
0
0
Extremely Inverse (IEC Curve A)
80
2
1
0
0
D =Time Dial setting (set in the relay by user).
V = I / I
pickup setting
> 1.05
K
D
B
Q
V
D
A
T
P
+
+
−
=
*
*
:
be
will
time
tripping
20.00,
V
1.05
For
trip.
a
not
but
signal,
pickup
a
produce
will
unit
the
1.05,
V
1
For
<
≤
<
<
:
setting
the
times
20.00
for
as
same
the
be
will
time
tripping
the
V,
20.00
For
≤
K
D
B
Q
D
A
T
P
+
+
−
=
*
20
*
Содержание GEK-106273L
Страница 19: ...GETTING STARTED 1 12 MIF Digital Feeder Protection GEK 106273L ...
Страница 95: ...SETTINGS 5 38 MIF Digital Feeder Protection GEK 106273L ...
Страница 101: ...I O CONFIGURATION 6 44 MIF Digital Feeder Protection GEK 106273L ...
Страница 127: ...KEYPAD AND DISPLAY 8 26 MIF Digital Feeder Protection GEK 106273L ...
Страница 147: ...INSTALLATION AND MAINTENANCE 10 2 MIF Digital Feeder Protection GEK 106273L ...
Страница 154: ...ANNEX 1 THERMAL IMAGE UNIT GEK 106273L MIF Digital Feeder Protection 11 7 Figure A 1 1 THERMAL CURVE FOR τ1 3 MINUTES ...
Страница 155: ...ANNEX 1 THERMAL IMAGE UNIT 11 8 MIF Digital Feeder Protection GEK 106273L Figure A 1 2 THERMAL CURVES FOR τ1 3 MIN ...
Страница 199: ...ANNEX 5 HARMONIC FILTERING 15 4 MIF Digital Feeder Protection GEK 106273L ...