Thyristor-switched capacitor apparatus

Details Thyristor-switched capacitor apparatus Thyristor-switched capacitor apparatus

1981-12-30

1984-10-02

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 56, 361100, 361111, 363 54, 363 68, H02H 320, H02H 710

Patent

active

044751397

ABSTRACT:
A protective circuit for a plurality of series connected thyristors where each thyristor has in parallel with it a resistance, capacitance type snubber circuit and a metal oxide varistor. The arrangement of the series connected thyristors, snubber circuits and their metal oxide varistors has in parallel with it a main metal oxide varistor. The main varistor is responsive to external transient surges so as to conduct large currents. The outer varistors are selected to have values so as to conduct a much smaller or minimal current relative to the current conducted by the main varistor. In a preferred arrangement, a tuning inductor is in series with the thyristors, snubber circuits and parallel arranged varistors. Also, the main varistor is arranged in parallel with the series connection of thyristor, snubber, varistor combination and inductor, and in series with a bank of capacitors.

REFERENCES:
patent: 3806765 (1974-04-01), Matsuoka et al.
patent: 3943427 (1976-03-01), Tolstov et al.
patent: 4217618 (1980-08-01), Kellenbenz et al.
patent: 4282568 (1981-08-01), Kobayashi et al.
patent: 4371909 (1983-02-01), Kano

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