Technical description
9 Technical data
9.3 Protection stages
VM59.EN001
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199
Current unbalance stage I
2
> (46) in feeder mode
Settings:
- Setting range I
2
/ I
1
>
2 – 70 %
Definite time function:
- Operating time
1.0 – 600.0 s (step 0.1 s)
Start time
Typically 300 ms
Reset time
<450 ms
Reset ratio
0.95
Inaccuracy:
- Starting
±1% - unit
- Operate time
±5% or ±200 ms
Earth fault stage I
0
> (50N/51N)
Input signal
I
0
( input X6- 7 & 8 or X6- 7 & 9)
I
0Calc
( = I
L1
+I
L2
+I
L3
)
Setting range I
0
>
0.005 … 8.00 When I
0
or
I
02
0.1 … 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
Typically 60 ms
Reset time
<95 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
0
>>> and I
0
>>>> (50N/51N)
Input signal
I
0
( input X6- 7 & 8 or X6- 7 & 9)
I
0Calc
( = I
L1
+I
L2
+I
L3
)
Setting range I
0
>>
0.01 … 8.00 When I
0
or
I
02
0.1 … 20.0 When I
0Calc
Definite time function:
- Operating time
0.08
**)
– 300.00 s (step 0.02 s)
Start time
Typically 60 ms
Reset time
<95 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.
