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AssigneeHitachi, Ltd.
InventorsMotoo Yamaguchi, Isamu Sone, Kunio Hirasawa, Yoshio Yoshioka, Akio Nishikawa, Hiroshi Suzuki, Mikio Sato, Masao Hosokawa
Estimating the term…
A SF.sub.6 gas insulating electric apparatus usable as a circuit breaker, etc., containing a SF.sub.6 gas insulator and a resin insulator, both of which insulators are present in an atmosphere to be exposed to arcs, characterized by making at least the surface portion to be exposed to arcs of the resin insulator from a polymer containing nitrogen atoms or a polyolefin resin, and if necessary together with an inorganic filler powder, is excellent in both surface and inner arc resistance and can maintain breaking performance for a long period of time.
In a SF.sub.6 gas arc extinguishing electric apparatus containing an SF.sub.6 arc extinguishing gas and a resin insulator, both of which are present in an atmosphere to be exposed to arcs, the improvement wherein at least the surface portion to be exposed to arcs of said resin insulator is made from a mixture of a polymer containing nitrogen atoms and a polyolefin resin, whereby said polymer containing nitrogen atoms improves the surface arc resistance and inner arc resistance of said polyolefin resin.
In an SF.sub.6 gas arc extinguishing electric apparatus containing an SF.sub.6 arc extinguishing gas and a resin insulator, both of which are present in an atmosphere to be exposed to arcs, the improvement wherein at least the surface portion to be exposed to arcs of said resin insulator is made from a mixture of a polymer containing nitrogen atoms, a polyolefin resin, and at least one of an inorganic filler powder and an organic pigment, whereby said polymer containing nitrogen atoms improves the surface arc resistance and inner arc resistance of said polyolefin resin.
In an SF.sub.6 arc extinguishing breaker having a metallic case filled with an SF.sub.6 arc extinguishing gas and having installed therein:
In a process for producing an SF.sub.6 gas arc extinguishing electric apparatus containing an SF.sub.6 arc extinguishing gas and a resin insulator, both of which are present in an atmosphere to be exposed to arcs, the improvement comprising making at least the surface portion to be exposed to arcs of said resin insulator by using a resin mixture comprising a poly(amic acid) capable of forming imide rings and a polyolefin resin, and heat treating the resin mixture to form imide rings, whereby the resin containing the imide rings improves the surface arc resistance and inner arc resistance of said polyolefin resin.
In a process for producing an SF.sub.6 gas arc extinguishing electric apparatus containing an SF.sub.6 arc extinguishing gas and a resin insulator, both of which are present in an atmosphere to be exposed to arcs, the improvement comprising making at least the surface portion to be exposed to arcs of said resin insulator by using a resin mixture comprising a poly(amic acid) capable of forming imide rings, a polyolefin resin, and at least one of an inorganic filler powder and an organic pigment, and heat treating the resin mixture to form imide rings, whereby the resin containing the imide rings improves the surface arc resistance and inner arc resistance of said polyolefin resin.
Dependencies are inferred from the claim text.