ABB RELION REX640, Техническое руководство, Страница: 851 / 1960

4.5.1 Three-phase overvoltage protection PHPTOV (ANSI 59)
4.5.1.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Three-phase overvoltage protection PHPTOV 3U> 59
4.5.1.2 Function block
Figure 480: Function block
4.5.1.3 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.
4.5.1.4 Analog channel configuration
PHPTOV has one analog group input which must be properly configured.
Table 778: 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.
Table 779: Special conditions
Condition Description
U3P connected to real measurements The function can work with one voltage chan-
nel connected if Num of start phases is set
to "1 out of 3". Otherwise, at least two vol-
1MRS759142 F Protection functions
REX640
Technical Manual
851