Characteristic
Value
Retardation time
<35 ms
Operate time accuracy in definite time mode
±1.0% of the set value or ±20 ms
Suppression of harmonics
DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
4.3.2.10
Technical revision history
Table 428: PDNSPTOC Technical revision history
Technical revision
Change
B
Internal improvement
C
Internal improvement
D
Internal improvement
4.4
Voltage protection
4.4.1
Three-phase overvoltage protection PHPTOV
4.4.1.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Three-phase overvoltage protection PHPTOV
3U>
59
4.4.1.2
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.
Protection functions
1MRS758755 C
420
REC615 & RER615
Technical Manual
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