Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Phase comparison
Patent
1982-08-26
1985-01-08
Levy, Stewart J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Phase comparison
324 725, 324 83D, G06F 1520
Patent
active
044929188
ABSTRACT:
A high voltage power line phase-angle and current measuring instrument suitable for mounting on the end of a power line hot stick is disclosed. The instrument is capacitively and inductively coupled to a single power line conductor whose phase angle and/or current are to be measured. The capacitive and inductive coupling produce voltage and current signals that are processed in voltage and current phase channels. The voltage and current phase channels filter and square the signals in a phase coherent manner, i.e., the phase relationship between the voltage and current signals is maintained as the signals are filtered and squared. The resulting voltage and current square-wave signals are applied to a signal processor. A current conversion channel also receives the current signal, the current conversion channel first converts the alternating current signal to a DC signal whose magnitude represents the RMS value of the alternating current signal, and then converts the RMS signal from analog form to digital form under the control of the signal processor. The digital RMS signal is also applied to the signal processor. The signal processor processes the signals it receives and selectively produces display control signals denoting phase angle, RMS current value and reactive current value. The phase angle is determined by measuring the time between zero crossings of the current and voltage square wave signals and mathematically combining resulting time measurements. The RMS current value is derived from the digital RMS signal; and, the reactive current value is determined by multiplying the RMS current by the phase angle.
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Hammerquist Eric M.
Hernandez E. Norman
Levy Stewart J.
Terra Technology Corp.
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