ABB RELION REX640 Technical Manual page 859

Protection and control

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1MRS759142 F

for the detection of undervoltage either in a single phase, two phases or three

The function contains a blocking functionality. It is possible to block function

outputs, timer or the function itself.

Analog channel configuration

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

Table 790: Analog inputs

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

Table 791: Special conditions

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.

Operation principle

The function can be enabled and disabled with the

corresponding parameter values are "On" and "Off".

The operation of PHPTUV can be described using a module diagram. All the modules

in the diagram are explained in the next sections.

Technical Manual

See the preprocessing function blocks in this document for the possible

signal sources.

Protection functions

Three-phase voltages

The function can work with one voltage chan-

Num of start phases is set to

nel connected if

"1 out of 3" but the other two channels must

be fed with high values (considerably above

Start value ). For other values of Num of start

phases , all three voltage channels must be

Operation setting. The