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t
TD
V
Vpickup
Vpickup
=
⋅
⋅
−
>
>
−
−
480
32
0 5
0 035
.
.
ANSIEQUATION2287 V2 EN
(Equation 38)
The type C curve is described as:
t
TD
V
Vpickup
Vpickup
=
⋅
⋅
−
>
>
−
+
480
32
0 5
0 035
.
.
ANSIEQUATION2288 V2 EN
(Equation 39)
The highest phase (or phase-to-phase) voltage is always used for the inverse time delay
integration, see
. The details of the different inverse time characteristics are
"Inverse time characteristics"
.
ANSI05000016-2-en.vsd
Voltage
IDMT Voltage
Time
VA
VB
VC
ANSI05000016 V2 EN
Figure 72:
Voltage used for the inverse time characteristic integration
A TRIP requires that the overvoltage condition continues for at least the user set time
delay. This time delay is set by the parameter
t1
and
t2
for definite time mode (DT) and by
selected voltage level dependent time curves for the inverse time mode (TOV). If the
PICKUP condition, with respect to the measured voltage ceases during the delay time, the
corresponding PICKUP output is reset.
7.2.7.3
Blocking
It is possible to block two step overvoltage protection (OV2PTOV ,59) partially or
completely, by binary input signals where:
Section 7
1MRK 511 287-UUS A
Voltage protection
178
Technical manual
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