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6 F 2 S 0 7 1 5
■Displaying Fault Time
This part describes how to calculate the fault times and display them.
《Note for Operation》
● The RMS values of the voltage elements are calculated sequentially from the
beginning of the waveforms. The point where the value drops down by 5% from the
normal value is taken as the fault detection point. The point where the value restores
to within 5% from the normal value is taken as the restoration point. The point where
the variation ratio is the largest between the 2 points as above is taken as the lowest
voltage point (Normal value = the RMS value at the 150 ms point form the beginning
of the waveforms).
● The channel in which the variation quantity is the largest is taken as the fault channel.
When the variation quantities of 2 or more channels are the same, the channel with
smaller channel number is taken as the fault channel.
● You can previously select whether the fault time is calculated automatically at the
same time with the waveform display or not.
(→2.1 Setting Parameters for Measurement and Analysis ■Selecting Options)
《Operating Procedure》
① On the [Measurement] menu, click [Fault Section Calculation].
② The information of the fault times is displayed.
･ When the waveform data is not a fault data or three-phase voltage is not included in the input elements,
they are not displayed.
･ The points are displayed by the elapsed time from the beginning of the waveforms even when the relative
time display is selected.
③ Click【OK】button.
･ The cursors are displayed at the following points in the channel in which the voltage drop ratio is the
largest.
Fault detection point Cursor 0 (Green)
Lowest voltage point Cursor 1 (Red)
Restoration from fault point Cursor 2 (Yellow)
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