Direct current measuring system for rectifiers

Details Direct current measuring system for rectifiers Direct current measuring system for rectifiers

G - Physics

01

R

324/2

G01R 29/00 (2006.01) G01R 17/02 (2006.01) G01R 19/22 (2006.01)

Patent

CA 1117185

11-HV-04325 ABSTRACT OF THE DISCLOSURE 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 difference between the primary and secondary line current 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 provision for unity current transformation through the phase shifting current transformer. The dc measuring circuit also handles the presence of zero sequence current without causing measurement error or circuit damage. The dc measuring circuit also indicates 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.

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