VAMP 52 - Page 220

9.3 Protection stages 9 Technical data Technical description
220
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Unbalance / broken line protection I
2
/I
1
> (46R)
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 ±3% of the set value or 0.5% of the rated value
- Operate time ±5% or ±150 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.