VAMP 257 - Page 182

VAMP 257 Feeder and motor manager
Technical description
VAMP Ltd
140
VAMP 24h support phone : +358 (0)20 753 3264
VM257.EN002
Earth fault stage I
0
> (50N/51N)
Input signal I
0
( input X1-7 & 8)
I
02
( input X1-9 & 10)
I
0Calc
( = I
L1
+I
L2
+I
L3
)
Setting range I
0
> 0.005 … 8.00 When I
0
or I
02
0.005 … 20.0 When I
0Calc
Definite time function: DT
- Operating time 0.08
**)
– 300.00 s (step 0.02 s)
IDMT function:
- Delay curve family (DT), IEC, IEEE, RI Prg
- Curve type EI, VI, NI, LTI, MI…depends on the family *)
- Time multiplier k 0.05 - 20.0
Start time 60 ms
Reset time 80 ms
Reset ratio 0.95
Inaccuracy:
- Starting ±2% of the set value or ±0.3% of the rated
value
- Operating time at definite time function ±1% or ±30 ms
- Operating time at IDMT function. ±5% or at least ±30 ms (I
0
< 5 x I
0n
)
*) EI = Extremely Inverse, NI = Normal Inverse, VI = Very Inverse, LTI = Long Time Inverse
MI= Moderately 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.
Earth fault stages I
0
>>, I
02
>, I
02
>> (50N/51N)
Input signal I
0
( input X1-7 & 8)
I
02
( input X1-9 & 10)
I
0Calc
( = I
L1
+I
L2
+I
L3
)
Setting range I
0
>> 0.01 … 8.00 When I
0
or I
02
0.01 … 20.0 When I
0Calc
Definite time function:
- Operating time 0.08
**)
– 300.00 s (step 0.02 s)
Start time 60 ms
Reset time 80 ms
Reset ratio 0.95
Inaccuracy:
- Starting ±2% of the set value or ±0.3% of the rated
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.