Displaying Fault Time - Toshiba RSM 100 Instruction Manual

■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
● The channel in which the variation quantity is the largest is taken as the fault channel.
● You can previously select whether the fault time is calculated automatically at the
《Operating Procedure》
① On the [Measurement] menu, click [Fault Section Calculation].
② The information of the fault times is displayed.
③ Click【OK】button.
2-16
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).
When the variation quantities of 2 or more channels are the same, the channel with
smaller channel number is taken as the fault channel.
same time with the waveform display or not.
(→2.1 Setting Parameters for Measurement and Analysis ■Selecting Options)
･ 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.
･ The cursors are displayed at the following points in the channel in which the voltage drop ratio is the
largest.
Fault detection point
Lowest voltage point
Restoration from fault point
Cursor 0 (Green)
Cursor 1 (Red)
Cursor 2 (Yellow)
⎯ 128 ⎯
6 F 2 S 0 7 1 5