Blocking - ABB REG650 Technical Manual

Section 9
Voltage protection
Voltage
VA
VB
VC
ANSI05000016 V1 EN
Figure 121: Voltage used for the inverse time characteristic integration
9.2.7.3
262
The highest phase (or phase-to-phase) voltage is always used for the inverse time delay
integration, see Figure 121. The details of the different inverse time characteristics are
shown in section "Inverse time characteristics"
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.

Blocking

It is possible to block two step overvoltage protection (OV2PTOV ,59) partially or
completely, by binary input signals where:
BLOCK:
BLK1:
BLK2:
blocks all outputs
blocks all pickup and trip outputs related to step 1
blocks all pickup and trip outputs related to step 2
1MRK 502 043-UUS B
Inverse Time Voltage
Time
en05000016_ansi.vsd
Technical Manual