Insulating molded body and gas circuit breaker

Patent metadata

Field	Value
Publication number	US-11322322-B2
Application number	US-201816962691-A
Country	US
Kind code	B2
Filing date	Oct 30, 2018
Priority date	Mar 12, 2018
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

An insulating molded body to be used for an arc extinguishing device of a gas circuit breaker is provided. The insulating molded body includes a fluororesin mixture which contains a fluororesin and an oxygen generator configured to generate oxygen through thermal decomposition at 450° C. or more and 1,150° C. or less with an arc generated when a conduction current is interrupted. The oxygen generator is dispersed in the fluororesin. Also provided is a gas circuit breaker including an insulating nozzle formed of the insulating molded body.

First claim

The invention claimed is:

1. An insulating nozzle including an insulating molded body to be used for an arc extinguishing device of a gas circuit breaker,
the insulating nozzle comprising a fluororesin mixture which contains a fluororesin and an oxygen generator configured to generate oxygen through thermal decomposition at 450° C. or more and 1,150° C. or less with an arc generated when a conduction current is interrupted, and in which the oxygen generator is dispersed in the fluororesin,
wherein the oxygen generator is dispersed in an entirety of the insulating molded body,
wherein the oxygen generator is an inorganic oxide, and
wherein the inorganic oxide is at least any one of manganese dioxide, or cobalt (II, III) oxide.

2. The insulating nozzle according to claim 1 , wherein:
a shape of the insulating molded body is a hollow cylinder; and
an outer diameter of an entire length of the hollow cylinder is constant.

3. The insulating nozzle according to claim 1 , further comprising:
an annular protrusion that protrudes radially inward along an entire circumference of a first end portion of the insulating molded body; and
a second end portion of the insulating molded body being configured to attach to a movable energizing contact such that a thickness of the insulating molded body is greater at the annular protrusion than at the second end portion.

4. The insulating nozzle according to claim 3 , wherein:
a thickness of a first end portion of the annular protrusion is constant; and
a thickness of a second end portion of the annular protrusion gradually increases.

5. An insulating nozzle including an insulating molded body to be used for an arc extinguishing device of a gas circuit breaker,
the insulating nozzle comprising a fluororesin mixture which contains a fluororesin and an oxygen generator configured to generate oxygen through thermal decomposition at 450° C. or more and 1,150° C. or less with an arc generated when a conduction current is interrupted, and in which the oxygen generator is dispersed in the fluororesin,
wherein the oxygen generator is dispersed in an entirety of the insulating molded body,
wherein the oxygen generator is an inorganic peroxide,
wherein the inorganic peroxide is at least any one of sodium peroxide, or potassium peroxide.

6. A gas circuit breaker comprising:
an insulating nozzle including an insulating molded body to be used for an arc extinguishing device,
the insulating nozzle including a fluororesin mixture which contains a fluororesin and an oxygen generator configured to generate oxygen through thermal decomposition at 450° C. or more and 1,150° C. or less with an arc generated when a conduction current is interrupted, and in which the oxygen generator is dispersed in the fluororesin,
wherein the oxygen generator is dispersed in an entirety of the insulating molded body,
wherein the arc extinguishing device is filled with an insulating gas,
wherein the insulating gas is sulfur hexafluroride,
wherein the oxygen generator is an inorganic oxide, and
wherein the inorganic oxide is at least any one of manganese dioxide, or cobalt (II,III) oxide.

Assignees

• Mitsubishi Electric Corp

Inventors

• Hiza Shuichi
• Kawana Takashi
• Hosokoshi Fumihiko
• Sato Motohiro
• Mimura Kenji

Classifications

• H01B3/44

  vinyl resins; acrylic resins (silicones H01B3/46) · CPC title

• H01H33/22

  Selection of fluids for arc-extinguishing · CPC title

• H01H33/74 Primary

  wherein the break is in gas (in air at atmospheric pressure H01H33/73) · CPC title

• H01H33/78 Primary

  wherein the break is in gas (in air at atmospheric pressure H01H33/77) · CPC title

• H01H33/7023

  characterised by an insulating tubular gas flow enhancing nozzle (H01H33/7038 takes precedence) · CPC title