Electric
Power
Measurement
of the harmonic wave of an inverter's power supply
The MEMORY HiCORDER can be used to analyze the
instantaneous value and direction of flow of the constituents of
the harmonic waves of all orders comprised in the primary current
of the inverter in order to identify the larger harmonic wave constituents
of the outward flow current. The relationship between changes and
points in time can be investigated by measuring the changes in the
harmonic waves of all orders using the time series analysis mode.
Using the instantaneous analysis mode, it is possible to grasp the
occurrence rate of each order of the harmonic wave generated from
the device and the extent of the inward and outward flow.
Using the time series recording and analysis modes, changes in harmonic
wave currents and voltage distortion ratio in the course of time can
be recorded as a graph. This, for example, makes it possible to grasp
the pattern of harmonic wave occurrences during one day. |
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Locating
ground-faulted wind power transmission lines
When dealing with many power transmission
lines, it requires major efforts to find a ground-faulted line. This
task can be greatly simplified by using multi-channel recording to
pick up the ground fault current with sensors.
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| Load
shutdown tests in power generation plants |
In power generation
plants, load shutdown tests are conducted to provide against irregularities
and sudden unexpected phenomena. The pre-trigger function can be used
to measure and record waveforms before and after the shutdown, enabling
accurate analysis.
The Vernier function, which can be used to perform fine adjustment
of amplitudes, is also a useful tool.
Necessary data can be recorded with the MEMORY HiCORDERs and utilized
as data for analyses.
| a. |
The time of the shutdown recorded as hour,
minutes, seconds and year, month and day. |
| b. |
Recording of the generator's voltage V and
the maximum stabilized voltage V before and after shutdown. |
| c. |
Recording of the maximum fluctuations in revolving
speed before and after shutdown. |
| d. |
Recording of the dead time of the hydraulic
turbine's governor servo and time of shutdown. |
| e. |
Recording of the number of openings, dead time,
and the duration of opened and closed time of the pressure regulator. |
| f. |
Recording the water pressure in pipes before
and after load shutdown. |
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