Technical description
9 Technical data
9.3 Protection stages
VM50.EN004
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223
Zero sequence voltage stages U
0
> and U
0
>> (59N)
NOTE! This is only available in voltage measurement mode U
0
.
Zero sequence voltage setting range
10 – 60 %U
0n
Definite time function:
- Operating time
0.3 – 300.0 s (step 0.1 s)
Start time
Typically 300 ms
Reset time
<450 ms
Reset ratio
0.97
Inaccuracy:
- Starting
±2% of the set value or ±0.3% of the rated value
- Operate time
±1% or ±150 ms
9.3.4.
Second harmonic function
2. Harmonic stage (51F2)
Settings:
- Setting range 2.Harmonic
10 – 100 %
- Operating time
0.05 – 300.00 s (step 0.01 s)
9.3.5.
Circuit-breaker failure protection
Circuit-breaker failure protection CBFP (50BF)
Relay to be supervised
T1, T2, T3 and T4
Definite time function
- Operating time
0.1** – 10.0 s (step 0.1 s)
Inaccuracy
- Operating time
±100 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.
9.3.6.
Arc fault protection (option)
The operation of the arc protection depends on the setting value
of the ArcI> and ArcI
01
> current limits. The arc current limits
cannot be set, unless the relay is provided with the optional arc
protection card.
Arc protection stage ArcI> (50ARC), option
Setting range
0.5 - 10.0 x I
n
Arc sensor connection
S1, S2, S1/S2, BI, S1/BI, S2/BI, S1/S2/BI
- Operating time (Light only)
12 ms
- Operating time ( light)
12ms
- Operating time (BIN)
<7 ms
- BO operating time
<3 ms
Reset time
<95 ms
Reset time (Delayed ARC L)
<120 ms
Reset time (BO)
<85 ms
Reset ratio
0.90
Inaccuracy:
- Starting
10% of the set value
- Operating time
±5 ms
- Delayed ARC light
±10 ms
ArcIo
