Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Polyphase
Patent
1977-11-18
1979-05-22
Rolinec, Rudolph V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Polyphase
324119, 324120, G01R 1900, G01R 1918
Patent
active
041561856
ABSTRACT:
A dc measuring circuit for power rectifiers is described wherein primary line current is utilized to measure direct current output. In the measuring circuit, line current transformers are connected to a multiphase instrument rectifier through a phase shifting current transformer which is adjustable to compensate for differences between the primary and secondary line current phase shift characteristics of the power transformer and any phase shift in the line current transformer. By such compensation, the average value of rectified primary line current in the measuring circuit is maintained independent of the commutating angle of the rectified power current. The dc measuring circuit includes means for providing unity current transformation through the phase shifting current transformer. The dc measuring circuit also includes means for handling the presence of zero sequence current without causing measurement error or circuit damage. The dc measuring circuit also includes means for indicating the blowing of a fuse associated with the power rectifier circuit. In one embodiment, the phase shifting current transformer comprises a double extended wye connected autotransformer. In another embodiment, the phase shifting current transformer comprises a truncated delta autotransformer.
REFERENCES:
patent: 3944919 (1976-03-01), Jewell et al.
Kelley, Jr. Fred W.
Thompson Samuel A.
Freedman William
General Electric Company
Karlsen Ernest F.
Rolinec Rudolph V.
Silverman Carl L.
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