Safety type electric field curtain apparatus

Details Safety type electric field curtain apparatus Safety type electric field curtain apparatus

1978-09-21

1980-05-27

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Impedance insertion

361226, H02H 102

Patent

active

042053595

ABSTRACT:
A plurality of wire-shaped electrodes are arrayed at equal intervals within a plane insulator layer, and an electric power source for applying an A.C. voltage between adjacent ones of electrodes is connected to the electrodes via protective resistors so that an electric field in a curtain form is established between respective electrodes. The resistance value of the protective resistors between the electric power source and the electrodes and the resistance of the electrodes themselves are respectively selected higher than a minimum A.C. ignition resistance that is necessary for preventing ignition by spark discharge of powder to be processed by the curtain-like electric field. This prevents powder explosion induced by a spark discharge caused by a fault occurring in one part of the electric field curtain.

REFERENCES:
patent: 2526763 (1950-10-01), Miller
patent: 3496413 (1970-02-01), Goodridge et al.
patent: 3551821 (1970-12-01), Griffey
patent: 3803453 (1974-04-01), Hull
patent: 3904929 (1975-09-01), Kanaya et al.
patent: 4029995 (1977-06-01), Itoh

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