Voltage fluctuation and flicker plus cycle-by-cycle options add an extra dimension to the Yokogawa WT3000 3-phase power analyser. With this functionality, the WT3000 complies with the IEC6100-3-3 standard.
The instrument can be used to carry out normal flicker measurement— it calculates all the values of the relative steady-state voltage change (dc), the maximum relative voltage change (dmax), the period during which the relative voltage change exceeds the threshold level (d(t)), the shortterm flicker value (Pst), and the long-term flicker value (Plt). It then compares them to preset limits, and provides a “pass/fail” judgement.
It can also be used to measure dmax caused by manual switching. It does so by measuring dmax, which means manually turning the EUT switch on and off. Then the average over 24 measurements is determined, and that is compared and judged against the limit.
Other measurable parameters include instantaneous flicker sensation (IFS) and cumulative probability function. Measurements of voltage fluctuation and flicker, along with harmonic current measurement (compliant with IEC61000-3-2 rev.2.2), are essential to test compliance with the latest European standards.
The WT3000 allows these standards tests to be performed on single-phase or 3-phase equipment, and will determine whether the results fall within the specified limit values. The cycle-by-cycle function takes measurements of parameters such as voltage, current, and active power for each cycle, and then lists the data on screen in a time series.
This function is intended for use in situations where the measurement data exhibits significant fluctuations. A typical application is motor evaluation, where rapid load fluctuations can occur. The new function takes measurements of parameters like voltage, current, and active power for each cycle, and then lists the data on-screen in a time series. Up to 3000 measurements of signals from 0.1Hz to 1kHz can be saved in CSV format.