Electricity: measuring and testing – A material property using electrostatic phenomenon – In a liquid
Patent
1989-01-24
1991-10-08
Wiedner, Kenneth
Electricity: measuring and testing
A material property using electrostatic phenomenon
In a liquid
324553, 324457, G01N 2760
Patent
active
050557947
ABSTRACT:
A static induction electric apparatus includes an oil tank, an electrical winding assembly, an insulating oil for cooling and insulating the winding, and a circulating pump. A sensor electrode having a measurement surface for providing an electrical signal indicative of the amount of the electric charge in the insulating oil is supported on the oil tank by a support assembly in such a relationship that the measurement surface of the sensor electrode is electrically insulated from and substantially flush with the inner surface of the oil tank. The distance between the sensing surface of the electrode and the inner surface of the oil tank is large enough to electrically insulate the two from one another but small enough to keep the electric field around the sensor electrode free of substantial disturbances.
REFERENCES:
patent: 3753102 (1973-08-01), Beck
patent: 4194148 (1980-03-01), Ohkubo
patent: 4592240 (1986-06-01), McHale
patent: 4607228 (1986-08-01), Reif
patent: 4873489 (1989-10-01), Melcher et al.
"Partial Discharge Automatic Monitor for Oil-Filled Power Transformer", pp. 422-428, vol. PAS-103, No. 2, 2-2-84.
"Static Induction Equipment", p. 125 E87, vol. 3, No. 10, JP-A-53139124, 1-29-79, Patent Abstract of Japan (Hitachi Seisakusho K.K.).
"Method For Measurement of Electrostatic Charged Quantity of Insulating Oil in Forced Oil Electrical Apparatus", pp. 95 [874] vol. 5, No. 202, 12-22-81, JP-A-56 125675 (Meidensha K.K.).
Electrical Insulation and Dielectric Phenomena, pp. 246-256, "Partial Discharge Automatic Monitor for Oil for Large Power Transformers", Leda et al., Claymont, Del., 2nd-6th Nov. 1986.
Mitsubishi Denki & Kabushiki Kaisha
Regan Maura K.
Wiedner Kenneth
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