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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 134:
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.
9.2.7.3
Blocking
It is possible to block two step overvoltage protection (OV2PTOV ,59) partially or
completely, by binary input signals where:
BLOCK:
blocks all outputs
BLK1:
blocks all pickup and trip outputs related to step 1
BLK2:
blocks all pickup and trip outputs related to step 2
9.2.7.4
Design
The voltage measuring elements continuously measure the three phase-to-ground
voltages or the three phase-to-phase voltages. Recursive Fourier filters or true RMS filters
of input voltage signals are used. The phase voltages are individually compared to the set
Section 9
1MRK 502 048-UUS A
Voltage protection
292
Technical manual
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