ABB RELION REX640 Technical Manual page 914

Protection functions
4.5.10.1 Identification
Function description
Three-phase overvoltage variation
protection
4.5.10.2 Function block
Figure 511: Function block
4.5.10.3 Functionality
The three-phase overvoltage variation protection function PHVPTOV monitors the
quality of the voltages. The function evaluates the power quality in the voltage by
calculating the average RMS value of the voltage over a set period. The function
includes a settable limit for the detection of overvoltage in a single phase, two
phases or three phases.
The function starts when the average RMS value of the voltage exceeds the set limit.
PHVPTOV operates with the definite time (DT) characteristics.
The function contains a blocking functionality. It is possible to block function
outputs, the definite timer or the function itself.
4.5.10.4 Analog channel configuration
PHVPTOV has one analog group input which must be properly configured.
Table 870: Analog inputs
Input
U3P
There are a few special conditions which must be noted with the configuration.
Table 871: Special conditions
Condition
U3P connected to real measurements
914
See the preprocessing function blocks in this document for the possible
signal sources.
IEC 61850 IEC 60617
identification identification
PHVPTOV 3Urms>
Description
Three-phase voltages
Description
The function can work with one voltage chan-
nel connected if
to "1 out of 3". Otherwise, all three voltage
channels must be connected.
1MRS759142 F
ANSI/IEEE C37.2
device number
59.S1
Num of start phases is set
REX640
Technical Manual