Electricity: electrical systems and devices – Safety and protection of systems and devices – With tuned circuit
Patent
1989-03-10
1990-12-04
Deboer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With tuned circuit
361 1, 361111, 340644, 324520, H02H 1100, G08B 2100
Patent
active
049758004
ABSTRACT:
A contact abnormality detection system for use in a gas-insulated switchgear or other power transmission or distribution apparatus. A gas-insulated switchgear includes a hermetic housing, an insulating gas sealed in the housing, and conductors in the housing having contacts for providing a path for a large current and being electrically insulated from the housing. An abnormality in the contacts causes the contacts to generate vibrations when a large current flows through them. A vibration detector detects vibrations generated by the switchgear including the vibrations generated by the contacts. The frequency spectrum of the vibrations detected by the vibration detector is analyzed to detect if the vibrations contain frequency components in the range of 200 to 500 Hz which meet predetermined criteria. If the vibrations do contain such frequency components, a contact abnormality decision unit decides that the contacts exhibit a contact abnormality, thereby permitting the abnormality to be identified before the contacts fail.
REFERENCES:
patent: 3801899 (1974-04-01), Liao
patent: 3887915 (1975-06-01), Olsen et al.
patent: 4006410 (1977-02-01), Roberts
patent: 4864286 (1989-09-01), Ohshita et al.
patent: 4897754 (1990-01-01), Konishi et al.
IEEE Trans. vol. PHS-100, No. 6, Jun. 1981, pp. 2733 to 2739.
Lecture No. 1147, National Conference of the Institute of Electrical Engineers of Japan, bfore 1988.
Electric Contact Techniques by Kinya Tsuchiya, published by Sogo Denshi Shuppan Sha , 7/1980.
Hashimoto Akira
Inui Yoshiaki
Kurosawa Yukio
Oshita Youichi
Yamagiwa Tokio
Deboer Todd E.
Hitachi , Ltd.
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