Bender B93100735, Manual

Page: 62 / 116

Power Quality
62 PEM735_D00084_02_M_XXEN/06.2020
The display shows:
Voltage interruption evaluation
On polyphase systems, a voltage interruption begins when the r.m.s. value U
L1/2 (rms)
of
all channels falls below the voltage interruption threshold. A voltage interruption ends
as soon as at least one channel reaches or exceeds the interruption threshold plus hys-
teresis again.
The voltage interruption threshold and the hysteresis are both set by the user accord-
ing to the application. The voltage interruption threshold should not be set below the
measurement uncertainty of the residual voltage
U
res
plus hysteresis. Typically, the hys-
teresis is 2 % of U
s
( U
din
). The voltage interruption threshold could thus be set, for exam-
ple, to 5 % or 10 % of U
s
( U
din
).
These settings can only be carried out via the communication interface (see annexes
"Modbus" and "Web server").
Display text Description
Counts Number of counts during the observation period
1s ≤ t < 180 s
Classification of the voltage interruption according to duration
(in this case, it varies between 1 second and 3 minutes)
EN 50160 does not specify limits for these measured values.