Function Block; Functionality; Analog Channel Configuration - ABB RELION REX640 Technical Manual

1MRS759142 C
4.5.8.2
4.5.8.3
4.5.8.4
REX640
Technical Manual

Function block

GUID-85CE8BA6-4E28-41D3-BFAB-017583E50098 V1 EN
Figure 443: 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 775: Analog inputs
Input
U3P
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.
Table 776: Special conditions
Condition
U3P connected to real measurements
Improper analog channel configuration causes a validation error if the analog
channels are not completely configured or they do not match with certain settings. For
troubleshooting, check the contents of this chapter and also the preprocessing blocks
in this document. The configuration can be written to the protection relay once the
mismatch is corrected.
Protection functions
Description
Three-phase voltages
Description
The function requires that at least two voltage
channels are connected as the the third channel
can then be derived. However, it is recommended
that all three voltage channels are connected.
Section 4
817