6.3 Viewing Anomalous Phenomena (EVENT screen)
112
Transient Overvoltage
• Detection Method
During each cycle, signals between 10 and 100
k
Hz are detected by comparator on any of three
voltage channels if their amplitude exceeds ±70.7
Vpeak.
Presence Detection
• Recording Contents
Event List data, voltage/current waveforms
• Event Data Format
• EVENT IN (On set):Event number, occurrence
d
ate, occurrence time, Event type, IN
• EVENT OUT (Recovery):Event number, occur-
rence date, occurrence time, Event type, OUT,
du
ration
Note 1:
Only the presence or non-presence of transient ov-
ervoltage is detected.
Voltage and current waveforms at the time of event
de
tection can be displayed. However, the transient
overvoltage waveform itself (circled in the diagram)
cannot be displayed.
Note 2:
Transient overvoltage that occurs repeatedly will be
de
tected as IN/OUT events. A transient overvoltage
occurring even once during a 200 ms period will be
identified as an IN event. Subsequent occurrence
will be monitored every 200 ms and when it is no
longer detected, an OUT event will be identified.
Rms Current (used to detect inrush current)
• Calculation Method
Rms current is calculated separately at each half-
cycle
on three current channels (Irms 1/2).
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