ABB RELION REX640 Technical Manual page 851

Protection and control

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1MRS759142 F

Three-phase overvoltage protection PHPTOV (ANSI 59)

Identification

Function description

Three-phase overvoltage protection PHPTOV

Function block

Figure 480: Function block

Functionality

The three-phase overvoltage protection function PHPTOV is applied on power

system elements, such as generators, transformers, motors and power lines, to

protect the system from excessive voltages that could damage the insulation

and cause insulation breakdown. The three-phase overvoltage function includes a

settable value for the detection of overvoltage either in a single phase, two phases

or three phases.

PHPTOV includes both definite time ( DT) and inverse definite minimum time

( IDMT) characteristics for the delay of the trip.

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

outputs, timer or the function itself.

Analog channel configuration

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

Table 778: Analog inputs

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

Table 779: Special conditions

U3P connected to real measurements

Technical Manual

See the preprocessing function blocks in this document for the possible

signal sources.

identification

Three-phase voltages

The function can work with one voltage chan-

nel connected if

to "1 out of 3". Otherwise, at least two vol-

Protection functions

ANSI/IEEE C37.2

device number

Num of start phases is set