Characteristic Value
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
4.5.8 Low-voltage ride-through protection LVRTPTUV (ANSI
27RT)
4.5.8.1 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
4.5.8.2 Function block
Figure 502: Function block
4.5.8.3 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
national grid codes. The LVRT curve can be defined accurately according to the
requirements by setting the appropriate time-voltage coordinates.
This function contains a blocking functionality. LVRTPTUV can be blocked with the
BLOCK input. Blocking resets timers and outputs.
4.5.8.4 Analog channel configuration
LVRTPTUV has one analog group input which must be properly configured.
Table 851: Analog inputs
Input Description
U3P Three-phase voltages
See the preprocessing function blocks in this document for the possible
signal sources.
There are a few special conditions which must be noted with the configuration.
Protection functions
1MRS759142 F
900 REX640
Technical Manual
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