Reverse Power - Deif GPC-3 Designers Reference Handbook

GPC-3 DRH 4189340587 UK
Standard curves
Time
100
Sec
90
80
70
60
50
40
30
20
10
9
8
7
6
5
4
3
2
1
.9
.8
.7
.6
.5
.4
.3
.2
.1
.5 .6 .7 .8 .9 1
The curves are shown for TMS = 1.

5.3 Reverse power

Two characteristics are available for the reverse power protections; definite (default) and inverse.
If inverse characteristic is selected, the tripping time is dependent on how much the set point is exceeded.
The unit will calculate the exact tripping time depending on the alarm settings. The alarm settings define a
certain amount of energy that defines the longest possible tripping time.
When the set point is exceeded, the measured energy is calculated according to the set point and the time
delay. If this value is exceeded, the alarm occurs. The maximum energy (kWh) will never be exceeded, so if
the reverse power increases, the time delay will decrease and vice versa.
DEIF A/S
2 3 4 5 6 7 8 9 10
Multiples of LIM
IEC Inverse
IEEE Moderately Inverse
IEEE Very Inverse
IEC Very Inverse
IEEE Extremely Inverse
IEC Extremely Inverse
20 30
Protections
Page 99 of 122