4.5.8.10 Technical data
Table 646: OEPVPH Technical data
Characteristic Value
Operation accuracy Depending on the frequency of the measured
current: f
n
±2 Hz
±2.5% of the set value or 0.01 × Ub/f
Start time , Frequency change:
Typically 200 ms (±20 ms)
Voltage change:
100 ms (±20 ms)
Reset time <60 ms
Reset ratio Typically 0.96
Retardation time <45 ms
Operate time accuracy in definite-time mode ±1.0% of the set value or ±20 ms
Operate time accuracy in inverse-time mode ±5.0% of the theoretical value or ±50 ms
4.5.9 Low-voltage ride-through protection LVRTPTUV
4.5.9.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Low-voltage ride-through protec-
tion
LVRTPTUV U<RT 27RT
4.5.9.2 Function block
Figure 357: Function block
4.5.9.3 Functionality
The low-voltage ride-through protection function LVRTPTUV is principally a
three-phase undervoltage protection. It differs from the traditional three-phase
undervoltage protection PHPTUV by allowing the grid operators to define its own
Low-Voltage Ride-Through ( LVRT) curve for generators, as defined by local or
1
Results based on statistical distribution of 1000 measurements
2
Includes the delay of the signal output contact
1MRS757644 H Protection functions
620 series
Technical Manual
687
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