Thyristor convertor failure detection device

Details Thyristor convertor failure detection device Thyristor convertor failure detection device

1981-08-06

1983-04-12

Shoop, William M.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 46, H02H 7125

Patent

active

043800459

ABSTRACT:
A failure detection device for a convertor which converts alternating current into a direct current through a plurality of rectifying thyristors. The waveform of the output direct current of the convertor is detected and is supplied to a band-pass filter which selectively passes the harmonic component which has a frequency corresponding to that of the AC voltage source for the convertor. The existence of the component of this frequency is characteristic of an occurrence of a failure within convertor. The amplitude of the component passing through the filter is then detected by a zener diode, and a failure signal is generated when the amplitude exceeds a predetermined level.

REFERENCES:
patent: 3617836 (1971-11-01), Henry
patent: 3849719 (1974-11-01), Geiersbach et al.
patent: 4133018 (1979-01-01), Terunuma et al.

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