JPS58178931A - Gas insulated electric device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to, for example, SFg gas am research or SFg
This invention relates to gas insulated nausea devices such as gas disconnects.

The arc that occurs between the fixed turtle and the CIT#Ib electrode is extinguished by spraying an arc-extinguishing gas such as SF or gas during a power cut-off. An insulating nozzle made of resin insulator is installed near the rounding arc generation part to effectively perform this process.

In conventional circuit breakers, the resin insulator nozzle is exposed to the high-temperature plasma-like arc that is generated when the electric current is cut off, resulting in the energy rays generated from the arc penetrating not only the surface of the nozzle but also inside the nozzle. It has the disadvantage that it causes thermal decomposition and creates voids and carbon, which results in a drastic reduction in R-diaphragm performance and insulation performance.

In order to eliminate such drawbacks, resins have traditionally been filled with inorganic fillers, such as metal oxidizer powders such as aluminum oxide and silicon oxide, to suppress arc energy rays and provide good arc resistance. Circuit breakers using insulators are provided. However, according to experiments conducted by the present inventors, for example, when a 84KV50KA1fi disconnection point structure was used, good shutoff characteristics were obtained when the cutting wax pressure was low;
It has become clear that when the r voltage is high, the release rr characteristics are poor and do not exhibit sufficient characteristics.

The purpose of the present invention is to eliminate such drawbacks, and as a result of extensive research, the present inventors have found that the present invention has a high reflectance, high heat resistance,
By filling the resin insulator with boron nitride (BN), which has excellent thermal conductivity and low dielectric constant, for example, 300KV50KA1 mi#i point configuration -? 550K
It has become possible to commercialize a circuit breaker with a high breaking voltage such as the V50KA2Jll break point configuration, and the reduction in the number of Jllili points has made it possible to achieve smaller, lighter and more economical breakers.

The present invention is equipped with a fixed electrode, a movable electric pole, and a resin insulator in the vicinity of these.
In a gas-insulated electrical device such as an LFR unit, the percentage value is the content of boronite dry in the previous day's resin removal I11 snout.

In the present invention, resin insulators include one-density polyethylene, nylon resin, polycarbonate, polypropylene,
Examples include fluororesin.

Examples of the fluorine fats include tetrafluoroethylene resins, co-electrolytic combinations of tetrafluoroethylene and hexafluoropropylene, and tetrafluoroethylene/@fats having par 70 loalkoxy resin.

As a result of extensive research, the present inventors have found that filling a resin insulator with boron nitride (BN) has the effect of significantly improving the arc resistance of the resin insulator, and that it has the effect of significantly improving the arc resistance of the resin insulator. Filled with nine drugs. The present invention was completed by discovering a new fact that allows the dielectric constant of the insulating nozzle to be lower than that of the insulating nozzle, thereby making it possible to apply it to a circuit breaker with a high breaking voltage.

The attached drawing shows a circuit breaker showing an example of the present invention, in which l is an 8F gas insulator, 2 is an 8F insulating nozzle for guiding the gas insulator 1 to an arc, 3 is a fixed ItI71A,
4 is a l81T-electrode, and 5 is a gas compression device for compressing sF gas insulation vJ1 and spraying it on the arc. Here, in the insulating nozzle 2, boron nitride (BN) t
I am forcing KM. Particularly preferred resin Ii! Examples of trifluorocarbons include fluorocarbon resins such as tetrafluoride etele/hezo, and as for the preferred light of boron nitride, the more the better from the point of view of arc resistance, while the less from the point of view of demonic properties. Generally speaking, a volume ratio of 1 to aol is appropriate due to the trade-off between the two countries. It goes without saying that the present invention can be applied to gas-insulated electrical devices such as circuit breakers, disconnectors, load switches, and earthing switches.

When the nozzle material of the present invention is applied, the nozzle does not deteriorate even with large current arcs, and has excellent insulation properties, making it possible to increase the cut-off voltage. 9. For example, in a circuit breaker, the free tonnage pressure is 2 times higher than that of a conventional circuit breaker.
The ability to commercialize 0KV50KAI cutoff point configuration and 550KV50KA2 cutoff point configuration is increased, the number of parts is reduced due to the number of cutoff points, and the reliability is improved by making the structure wooden.
The reduction in size and weight of the continuous and continuous parts and the use of kyosaki injection were achieved, and one dimension was significantly reduced from the JTL.

In addition, the nozzle is rounded without deterioration due to electric gamming, and maintenance and inspection of the nozzle is not required. For example, in an 8Fg gas circuit breaker, etc., it is possible to eliminate maintenance of the circuit breaker.

[Brief explanation of the drawing]

The figure is an rIfr side view of a circuit breaker showing an example of the present invention.

Claims (1)

[Claims] 1. In a gas-insulated electric device including a gas insulator such as SF-gas and a resin insulator coexisting in an atmosphere exposed to an arc, at least a portion of the resin insulator that is exposed to the arc The gas insulated enclosure is characterized in that its surface is made of a resin called boro/nitride (BN). 2. The gas insulation-A device according to claim 1, wherein the resin insulator is coated with fluorine-containing material. 3. Scope of shaft permissible requirements for filling boron nitride (B N) at a volume ratio of 1 to 30% No. 1 JA
Or the gas insulated electrical device according to item 2.