frako EM-PQ 2500, Руководство по эксплуатации

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54
Configuration - measurement
Transients
Transient voltages are rapid, impulsive transi-
ent oscillation processes in electrical networks.
Transient voltages are not predictable with res-
pect to time and last for a limited period.
Transient voltages are caused by the effects of
lighting, due to switching operations or the trig-
gering of fuses.
• The EM-PQ2500 recognizes transients that
are longer than 50µs.
• The EM-PQ2500 monitors the voltage measu-
rement inputs on transients.
• Transient monitoring can be set per phase.
• There are two independent criteria for recog-
nizing transients.
• If a transient has been recognized, the wave
shape is saved in a transient recording.
• If a transient has been recognized, the limit
value is automatically increased by 20V, both
in automatic and manual modes. This auto-
matic increase of the limit value fades within
10 minutes.
• If another transient is recognized within the
next 60 seconds, this transient is recorded
with 512 points.
• You can display recorded transients with the
EM-PQ VIS incident browser.