Monitoring system for step-type switching transformer

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

H - Electricity

02

P

323/9

H02P 13/06 (2006.01) H02H 7/055 (2006.01)

Patent

CA 2038063

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.

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