Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Patent
1985-05-06
1987-03-17
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
307252J, 361111, 363 54, 363 68, H03K 1773, H02H 712
Patent
active
046512519
ABSTRACT:
A protection circuit for use with a thyristor having several break over diode, BOD, elements is connected between the anode and the gate of a thyristor providing static and dynamic overvoltage protection. With the exception of the BOD element connected to the gate, all the BOD elements have RC circuits connected in parallel, whose respective resistance and capacitance values are essentially identical. The BOD element connected to the gate and the cathode-gate portion of the thyristor has an additional RC circuit connected in parallel, whose resistance value is smaller or the same and whose capacitance value is smaller than the respective resistance and capacity values of the other RC circuits. Preferably, in this last RC circuit the resistance value is very small in contrast to the resistance values of the other RC circuits, and the capacitance value is negligible. In this preferred embodiment, the static actuation voltage is determined by the BOD elements not directly connected to the gate, and the dynamic actuation characteristic is determined by an equivalent series RC circuit which is determined by the capacitances of all the RC circuits and by the resistance, which is connected in parallel to the series connection of the BOD element connected to the gate and the thyristor gate-cathode portion.
REFERENCES:
patent: 3938026 (1976-02-01), Hoffman et al.
patent: 4367418 (1983-01-01), Faust et al.
patent: 4473858 (1984-09-01), Thiele
Design of Water-Cooled Thyristor Valve Groups for Extension of Manitoba Hydro HVDC System by Beriger, Etter, Hengsberger and Thiele; Cigre Report No. 14-05 given at the International Conference on Large High Voltage Electric Systems at Paris in 1976.
Gaffin Jeffrey A.
Pellinen A. D.
Siemens Aktiengesellschaft
Ulbrich Volker R.
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