Monitoring system for step-type switching transformer

Details Monitoring system for step-type switching transformer Monitoring system for step-type switching transformer

1991-03-21

1992-07-07

Wong, Peter S.

Electricity: power supply or regulation systems

External or operator controlled

Using a transformer or inductor as the final control device

323255, 323902, G05F 114

Patent

active

051286050

ABSTRACT:
A multiphase stepping transformer wherein a closed vacuum interrupter at each phase is opened before a respective stepping switch is advanced is controlled by continuously monitoring current flow through the interrupters. Before the interrupters are opened an error signal is generated unless all of the monitored current flows lie to one side of a predetermined threshold. After the interrupters are opened an error signal is generated if current flow is detected through any of the interrupters. Advance of the stepping switches is blocked on generation of any error signal. The apparatus includes for each interrupter a respective current detector, a light-emitting diode energized by the respective detector, a light receiver associated with each diode, and a light-transmitting cable connecting each diode with the respective receiver.

REFERENCES:
patent: 3436646 (1969-04-01), Prescott
patent: 3544884 (1970-12-01), Prescott
patent: 3555404 (1971-01-01), Bleibtreu
patent: 3684948 (1972-08-01), Eissmann
patent: 3978395 (1976-08-01), Legnaioli
patent: 4048520 (1977-09-01), Muskovac et al.
Bill Olschewski, "Optical Coupling Extends Isolation-Amplifier Utility", Electronics, Aug. 19, 1976, pp. 81-88.
Reinhausen Manufacturing's Brochure "Load Tap Changer Type UVT".

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