Hioki 3197 - Detection Methods and Recording Contents of Events

6.3 Viewing Anomalous Phenomena (EVENT screen)
110
Detection Methods and Recording Contents of Events
Rms voltage (Urms1/2)
(use to detect voltage swells, voltage dips and interruptions)
• Calculation Method
Rms voltage (Urms 1/2) is calculated separately
fo
r three channels at every half cycle.
Voltage Swell
• Detection Method
Detect Using Urms 1/2.
Set the threshold as a percentage of nominal volt-
age.
When the rms voltage rises above the positive
th
reshold, it is detected as an “EVENT IN (on
set)" event. Subsequently, when the voltage falls
back below the threshold (minus appropriate hys-
teresis), it is detected as an “EVENT OUT (recov-
ery)" event.
• Recording Contents
Event list data, voltage/corrent waveforms, event
v
oltage fluctuation graph
• Event Data Format
EVENT IN (On set): Event no., occurrence date,
o
ccurrence time, event type, channel and IN
EVENT OUT (Recovery): Event no., occurrence
d
ate, occurrence time, event type, channel, OUT,
maximum voltage and continuation period
• Event Voltage Fluctuation Graph
Fluctuation graph of Urms from about 0.5 sec-
onds before detection to about 2.5 seconds after
d
etection