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Voltage Protection
Table 10.30 – Overvoltage stages U>, U>> and U>>> (59)
Overvoltage setting range:
Definite time characteristic:
- operating time
Starting time
Resetting time U>
Resetting time U>>, U>>>
Retardation time
Reset ratio
Inaccuracy:
- starting
- operate time
This is the instantaneous time i.e. the minimum total operational time including the fault
detection time and operation time of the trip contacts.
The measurement range is up to 160 V. This limits the maximum usable setting when
rated VT secondary is more than 100 V.
Table 10.31 – Undervoltage stages U<, U<< and U<<< (27)
Setting range
Definite time function:
- Operating time U<
- Operating time U<< and U<<<
Undervoltage blocking
Start time
Reset time for U<
Reset time for U<< and U<<<
Retardation time
Reset ratio (hysteresis)
Reset ratio (Block limit)
Inaccuracy:
- starting
- time
This is the total operational time including the fault detection time and operation time of
the trip contacts.
Technical Data
50 - 150 %U
for U>, U>>
n
50 - 160 % U
for U>>>
n
0.08
- 300.00 s (step 0.02) (U>, U>>)
0.06
- 300.00 s (step 0.02) (U>>>)
Typically 60 ms
0.06 - 300.00 s (step 0.02)
<95 ms
<50 ms
0.99 – 0.800 (0.1 – 20.0 %, step 0.1 %)
±3% of the set value
±1% or ±30 ms
20 – 120%xU
N
0.08
– 300.00 s (step 0.02 s)
0.06
– 300.00 s (step 0.02 s)
0 – 80% x U
N
Typically 60 ms
0.06 – 300.00 s (step 0.02 s)
<95 ms
<50 ms
1.001 – 1.200 (0.1 20.0 %, step 0.1 %)
0.5 V or 1.03 (3 %)
±3% of set value
±1% or ±30 ms
857-UM001A-EN-P – July 2009
10-13
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