VAMP Ltd
Overcurrent and earth-fault relay
Technical Description
VAMP 130
VM130.EN003
Vamp 24h support phone : +358 (0)40 573 6316
39
5.3.
Protection stages
5.3.1.
Overcurrent protection
Overcurrent stage I> (50/51)
Current setting range:
0.10 – 5.00 pu
Definite time characteristic:
- Operating time
0.08** - 300.00 s (step 0.02)
Inverse time characteristic:
- 4 characteristic curve sets: (IEC60255-
3)
- Time multiplier k
EI, VI, NI, LTI *)
0.05 – 3.20
Starting time
<60 ms
Resetting time
<60 ms
Resetting ratio
0.97
Inaccuracy:
- Starting
±2% of set value
- Operating time definite time
- Operating time inverse time
±1% or ±30 ms
±5% or at least ±30 ms (I< 50 x In)
*) EI = Extremely Inverse, VI = Very Inverse, NI = Normal inverse, LTI = Long Time Inverse
**) This is the instantaneous time i.e. the minimum total operational time including the fault
detection time and operation time of the trip contacts.
Overcurrent stages I>> and I>>> (50/51)
Current setting range
0.10 – 40.00 pu
Definite time characteristic:
- Operating time
0.05* - 300.00 s (step 0.01)
Starting time
<30 ms
Resetting time
<60 ms
Resetting ratio
0.97
Inaccuracy:
- Starting
±2% of set value
- Operate time
±1% or ±30 ms
*)
This is the instantaneous time i.e. the minimum total operational time including the fault
detection time and operation time of the trip contacts.
Phase unbalance stage I2> (46)
Current setting range
5 – 70% I2/I1
Definite time characteristic:
- Operating time
1.0 – 600.0s s (step 0.1)
Starting time
<300 ms
Resetting time
<300 ms
Resetting ratio
0.95
Inaccuracy:
- Starting
±3% of set value or
±0.5% of rated value
- Operate time
±5% or ±300 ms
Thermal overload stage T> (46)
Settings:
- Max. continuous load current k x In
( trip = thermal trip level)
0.50 - 1.20 x In
- Thermal alarm level
60 – 99%
- Heating time constant
2 – 60 min
- Cooling time constant
1.0 x tau
