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partial-discharge-resistant insulating varnish
A partial-discharge-resistant insulating varnish has a polyamide-imide enamel varnish and an organo-silica sol that are dispersed in a solvent. The solvent has 50 to 100% by weight of γ-butyrolactone. An insulated wire has a conductor, and a partial-discharge-resistant insulation coating film formed on the surface of the conductor. The partial-discharge-resistant insulation coating film is made of the partial-discharge-resistant insulating varnish.
The partial discharge is generated such that, when a minute gap exists in an insulation for a wire or cable or between wires, electric field concentrates on that part to cause a weak discharge. Due to the partial discharge generated, the insulation deteriorates. Further, due to the progress of the deterioration, a breakdown will occur.
A partial-discharge-resistant insulating varnish that silica fine particles can be uniformly dispersed preventing the aggregation thereof so as to enhance the partial discharge resistance. Insulated wire that a coating film is formed on a conductor by using the partial-discharge-resistant insulating varnish.
Advantages of the partial-discharge-resistant insulating varnish
The partial-discharge-resistant insulating varnish with enhanced partial discharge resistance can be obtained since the organo-silica sol is uniformly dispersed preventing the aggregation thereof.
The insulated wire can be less likely to be subjected to the partial discharge erosion since the conductor is coated by the partial-discharge-resistant insulating varnish with the organo-silica sol uniformly dispersed such that the insulation coating film can be formed with the silica uniformly dispersed. As a result, the insulated wire can be applied to various inverter-fed systems to significantly elongate the lifetime of electric appliances therewith.
The partial discharge is generated such that, when a minute gap exists in an insulation for a wire or cable or between wires, electric field concentrates on that part to cause a weak discharge. Due to the partial discharge generated, the insulation deteriorates. Further, due to the progress of the deterioration, a breakdown will occur.
A partial-discharge-resistant insulating varnish that silica fine particles can be uniformly dispersed preventing the aggregation thereof so as to enhance the partial discharge resistance. Insulated wire that a coating film is formed on a conductor by using the partial-discharge-resistant insulating varnish.
Advantages of the partial-discharge-resistant insulating varnish
The partial-discharge-resistant insulating varnish with enhanced partial discharge resistance can be obtained since the organo-silica sol is uniformly dispersed preventing the aggregation thereof.
The insulated wire can be less likely to be subjected to the partial discharge erosion since the conductor is coated by the partial-discharge-resistant insulating varnish with the organo-silica sol uniformly dispersed such that the insulation coating film can be formed with the silica uniformly dispersed. As a result, the insulated wire can be applied to various inverter-fed systems to significantly elongate the lifetime of electric appliances therewith.
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