Standard curves
.5
.8
.6 .7
.9 1
2
3
4
5 6 7 8 9 10
20
30
.1
.2
.3
.4
.5
.6
.7
.8
.9
1
2
3
4
5
6
7
8
9
10
20
30
40
50
60
70
80
90
100
IEC Inverse
IEC Very Inverse
IEC Extremely Inverse
IEEE Moderately Inverse
IEEE Very Inverse
IEEE Extremely Inverse
Time
Sec
Multiples of LIM
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.
GPC-3 DRH 4189340587 UK
Protections
DEIF A/S
Page 99 of 122
