ABB RELION REX640 Technical Manual page 900

Protection and control

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Table of Contents

Protection functions

Characteristic

Operate time accuracy in definite-time mode ±1.0% of the set value or ±20 ms

Operate time accuracy in inverse-time mode

Low-voltage ride-through protection LVRTPTUV (ANSI

Identification

Function description

Low-voltage ride-through protec-

Function block

Figure 502: Function block

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.

Analog channel configuration

LVRTPTUV has one analog group input which must be properly configured.

Table 851: Analog inputs

There are a few special conditions which must be noted with the configuration.

See the preprocessing function blocks in this document for the possible

signal sources.

±5.0% of the theoretical value or ±50 ms

identification

Three-phase voltages

1MRS759142 F

ANSI/IEEE C37.2

device number

Technical Manual