Electricity: conductors and insulators – With fluids or vacuum – With fluid-condition responsive and/or indicating means
Patent
1994-08-15
2000-05-16
Sough, Hyung-Sub
Electricity: conductors and insulators
With fluids or vacuum
With fluid-condition responsive and/or indicating means
174 14R, 174 151, 174 162, 174 17GF, 174 25G, 174 26G, H02G 1520
Patent
active
060639970
ABSTRACT:
In a gas insulated electric apparatus having gas sections filled with insulating gas, a locating device determines a position of a gas section in which an insulation abnormality is detected, on the basis of a detection signal from sensors disposed in each of predetermined gas sections. At the same time a hindering degree diagnosing device diagnoses the degree and the kind of the insulation abnormality, by comparing a detection signal from the sensors with data stored in a data base. A valve control generates a valve control signal, responding to the locating device and the hindering degree diagnosing device, and in response to the valve control signal, a trip circuit generates a valve opening signal to open an electromagnetic valve disposed in a gas section in which an insulation abnormality is detected. An insulating gas injecting and evacuating device injects an insulating gas, different from the initial insulating gas with which the gas sections are filled beforehand, into the gas section for which the electromagnetic valve has been opened by the valve opening signal, or evacuates a predetermined amount of the insulating gas with which the gas sections are filled beforehand, so as to increase insulation strength.
REFERENCES:
patent: 2040204 (1936-05-01), Emanuelt
patent: 3403063 (1968-09-01), Walker
patent: 4257905 (1981-03-01), Christophorous et al.
patent: 4320035 (1982-03-01), Harrold
patent: 4565901 (1986-01-01), Hirooka et al.
patent: 4607245 (1986-08-01), Kuroda et al.
patent: 5146170 (1992-09-01), Ishikawa et al.
Mulcahy et al. "A Review of Insulation Breakdown and Switching in Gas Insulation", Aug. 1970, pp. 55-61, 174-25G.
Endo Fumihiro
Ishikawa Toshio
Iwaasa Shuzo
Utsumi Tomoaki
Yamagiwa Tokio
Hitachi , Ltd.
Sough Hyung-Sub
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