It is essential to provide power frequency overvoltage protection, in the form of
time delayed element, either IDMT or DT to prevent equipment damage.
4.5.1.7 Signals
Table 573: PHPTOV Input signals
Name Type Default Description
U_A_AB SIGNAL 0 Phase to earth volt-
age A or phase to
phase voltage AB
U_B_BC SIGNAL 0 Phase to earth volt-
age B or phase to
phase voltage BC
U_C_CA SIGNAL 0 Phase to earth volt-
age C or phase to
phase voltage CA
BLOCK BOOLEAN 0=False Block signal for acti-
vating the blocking
mode
Table 574: PHPTOV Output signals
Name Type Description
OPERATE BOOLEAN Operate
START BOOLEAN Start
4.5.1.8 Settings
Table 575: PHPTOV Group settings (Basic)
Parameter
Values (Range) Unit Step Default Description
Start value 0.05...1.60 xUn 0.01 1.10 Start value
Time multiplier 0.05...15.00 0.01 1.00 Time multiplier
in IEC/ANSI IDMT
curves
Operate delay time 40...300000 ms 10 40 Operate delay time
Operating curve
type
5=ANSI Def. Time
15=IEC Def. Time
17=Inv. Curve A
18=Inv. Curve B
19=Inv. Curve C
20=Programmable
15=IEC Def. Time Selection of time
delay curve type
1MRS757644 H Protection functions
620 series
Technical Manual
635
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