Astra Energy Inc (ASRE)

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System B – Oscilloscope Tests To verify the voltage/current relationships in the DENT measurement system, the SIGINT 4 channel scope, normally only monitoring the voltages of the device, was configured with a current to voltage transducer on the fourth channel. By moving this coil (Tektronix A622; Figure 15) to the three inputs and three outputs, the current/voltage relationships could be cross checked against the DENT units.

Basic convention is that lagging power factor is when current lags voltage; this is for inductive loads. Leading power factor is when current leads voltage; this is for capacitive loads. Note the sign conventions can be different, based on the IEC and IEEE conventions; the IEC convention has power factor that is dependent on power flow direction; the IEEE convention uses negative for inductive loads and positive for capacitive loads: https://www.se.com/ww/en/faqs/FA212521/ The six screen shots are: Input, phase 1, SDS00015.jpg Input, phase 2, SDS00016.jpg Input, phase 3, SDS00017.jpg Output, phase 1, SDS00018.jpg Output, phase 2, SDS00019.jpg Output, phase 3, SDS00020.jpg By measuring the offset in time from the peak voltage to the peak current, the power factor as displayed by the DENT unit could be verified approximately. Only screen shots of the oscilloscope were taken, so the approximate time values of period and offset were calculated using the raw pixel values, and converting them to times. In the output measurements, the time delay from peak of the voltage to the peak of the current could only be estimated, and hence the power factor and phase angles did not correlate. The algorithm for calculation of the power factor and phase angle in the DENT unit is not known. The manual does not appear to be explicit about power factor sign; an inquiry has been made to DENT. In this test, 195 uF of capacitance was on the load.

Two of these oscilloscope plots are shown in Figure 17 and Figure 18. A corresponding spreadsheet, pf_calc_based_on_time.xls is included in the data files to show how these values were calculated. These approximate (due to the nature of the waveforms) calculations seem to indicate that the calculations by the DENT are correct.

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