Voltage Protection; Three-Phase Overvoltage Protection Phptov - ABB RELION REC615 Technical Manual

Protection functions
Characteristic
Retardation time
Operate time accuracy in definite time mode
Suppression of harmonics
4.3.2.10 Technical revision history
Table 428: PDNSPTOC Technical revision history
Technical revision
B
C
D
4.4

Voltage protection

4.4.1

Three-phase overvoltage protection PHPTOV

4.4.1.1 Identification
Function description
Three-phase overvoltage protection PHPTOV
4.4.1.2 Function block
Figure 209: Function block
4.4.1.3 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.
420
Value
<35 ms
±1.0% of the set value or ±20 ms
DFT: -50 dB at f = n × f , where n = 2, 3, 4, 5,...
n
Change
Internal improvement
Internal improvement
Internal improvement
IEC 61850 IEC 60617
identification identification
3U>
1MRS758755 C
ANSI/IEEE C37.2
device number
59
REC615 & RER615
Technical Manual