Method and device to reduce electrical insulator flashover

Details Method and device to reduce electrical insulator flashover Method and device to reduce electrical insulator flashover

1998-09-04

1999-11-23

Fleming, Fritz

Electricity: electrical systems and devices

Discharging or preventing accumulation of electric charge

By charged gas irradiation

361220, 361230, H05F 0306

Patent

active

059911468

ABSTRACT:
A device that reduces power transmission insulator flashover by preventing the buildup of contaminants and dust on the surface of electrical insulators. The device is primarily designed for use on high tension wire insulators and creates an envelope of positive and negative ions that cover the insulators' skirts and consequently repels dust and other particles. The device is embedded in at least one insulator skirt and includes a small induction coil, a diode, a series of capacitors, and a fine needle that are employed as an ion generator which produces a negative or positive polarity ion corona region. The induction coil produces an AC voltage that is induced by the power line current. This AC voltage is rectified by the diode. As contaminants and dust particles approach the surface of the skirt, they become charged with the same polarity as the ions leaving the needle, and are consequently repelled from the corona region. The device reduces the possibility of flashovers by preventing contaminants from landing on the surface of the insulators and preventing the accumulation of "dry bands".

REFERENCES:
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patent: 4010316 (1977-03-01), Jolly et al.
patent: 4125742 (1978-11-01), Rabinowitz
patent: 4364752 (1982-12-01), Fitch et al.
patent: 4539022 (1985-09-01), McLoughlin
patent: 4944778 (1990-07-01), Yanagawa
patent: 5141529 (1992-08-01), Oakley et al.
patent: 5694286 (1997-12-01), Fowler et al.

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