JPS5823130A - Breaker - 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 relates to a circuit breaker, and in particular, the circuit breaker is disposed near an arc generating part to extinguish the arc in a short time by blowing gas to the arc generated between a movable electrode and a fixed electrode when interrupting a large current. The present invention relates to a circuit breaker equipped with an insulating material.

In this type of breaker, when the current is interrupted, a high-temperature plasma-like arc is generated between the movable electrode and the fixed electrode. Conventionally, in order to extinguish this arc, a gas flow such as air, SF, gas, etc. was blown onto the arc from an insulating nozzle made of fluororesin. However, when an insulator made of fluororesin is exposed to a high-temperature plasma-like arc generated in high-pressure air or high-pressure gas, the energy rays generated from the arc penetrate not only the surface of the nozzle but also the inside.
This had the disadvantage of creating voids and carbon inside the nozzle, significantly reducing insulation performance.

In order to eliminate such drawbacks, inorganic fillers, such as metals such as bronze, or powders of metal oxides such as silicon oxide, titanium oxide, aluminum oxide, etc., with a particle size of 3 to 20 μm are added.
A circuit breaker using a fluororesin insulator mixed with a large amount of 0 to 80% by volume has been provided. The resin insulator used in this breaker contains a large amount of inorganic filler to block arc energy rays and has good internal arc resistance.

However, because a large amount of inorganic filler is mixed in, the dielectric constant is extremely high, and the shielding performance is limited, especially at tens of kilovolts.
It has the disadvantage of poor breaking performance as described above.

The present invention aims to eliminate these drawbacks.

As a result of various studies, the present inventors have completed the present invention by discovering the following completely new fact. That is, the pigment usually has an extremely small particle size, and even when added in a very small amount, it has the effect of shielding the optical energy of the arc, thereby significantly improving the internal arc resistance of the resin insulator. Therefore, since a large amount of inorganic filler is not added as in the conventional products, the dielectric constant can be kept low, and it can be applied to circuit breakers with high breaking voltage.

The breaker of the present invention includes a fixed electrode, a movable electrode, and a polymer insulator for insulating between these electrodes, and extinguishes an arc generated when current is interrupted by the polymer insulator and gas spray. , characterized in that the polymeric insulator contains a pigment.

In the present invention, examples of the polymeric insulating material include high-density polyethylene, ultra-high-density polyethylene, nylon resin, polycarbonate, polypropylene, and fluorinated resin. Examples of fluorinated resins include tetrafluoroethylene resin,
Examples include a copolymer of tetrafluoroethylene and hexafluoropropylene, and a tetrafluoroethylene resin having a fluoroalkoxy group.

Pigments contained in these polymeric insulators include inorganic pigments and organic pigments. Examples of inorganic pigments include titanium oxide, zinc white, chromium oxide, co-ruto green cadmium red, Bengara, ultramarine blue, konokuruto blue, cadmium yellow, and barium yellow.

As a preferable example of the organic pigment, ・Kumamanent Red AG
1 Permanent Red F 2 R, ) (-Manent Red F4R,, Permanent Red F4RH.

Permanent Orange,) Ku-Manento V Orange G1 Permanent Yellow NC01 Nono-Manento Bordeaux F
3 R% Watching Red, No Nza Yellow G
1 Hansa Yellow 10G1 Benzidine Yellow GR, Benzidine Orange, Setludo 5B, Pigment Green B1 Phthalocyanine Green, Fast Sky Blue, Phthalocyanine Blue, and the like.

These inorganic pigments and organic pigments are contained in polymeric insulators.
Not only seeds but also a mixture of two or more kinds can be added.

The inorganic pigment contained in the polymeric insulator may have an average particle size of 1 μm or less, and the finer the particle size, the more effective it is, but the inorganic pigment powder usually has a diameter of 0.3 to 0.8 μm. It is effective for the present invention because it is On the other hand, organic pigments usually have a particle size of 0.5 μm or less.

Generally, the particle size of polymeric insulating materials such as fluoride resin is approximately 10
It is about 100 μm. When an inorganic filler of 3 to 20 μm is mixed in and sintered, large particles are not completely encapsulated inside the resin, and some air is interposed between the resin and the particles, and microscopic particles are formed between the material powder. This makes it easier for cracks to form.

As a result, in the past, the inorganic filler absorbed the energy rays of the arc and became high temperature, causing the nearby air to expand.
This air is emitted from the nozzle surface while interconnecting the cracks, resulting in a large number of holes in the nozzle and a reduction in insulation.

However, when pigments with extremely small particle sizes are used as in the present invention, no air space is left and the pigments are encapsulated in a polymeric insulator, causing microscopic cracks between the material powders. Even if it absorbs the energy of the arc and reaches a high temperature, the heat is immediately transferred to the surrounding materials, so it is presumed that local thermal decomposition is unlikely to occur.

In the present invention, the amount of pigment contained in the polymeric insulator varies depending on the type of pigment, but in the case of an inorganic pigment, it is 0.
．． 2 to 5% by weight is desirable. Inorganic pigment content is 0.2
If it is less than 1% by weight, the amount of inorganic pigment uniformly dispersed in the polymeric insulator is too small, and desirable luminosity cannot be expected. On the other hand, if the content of the inorganic pigment exceeds 5% by weight, the electrical properties, particularly the insulation properties, will significantly deteriorate.

The content of organic pigment in the polymeric insulator is 0.1% by weight ~
About 10% by weight is desirable. Organic pigment content is 0.1
If it is less than % by weight, the amount of organic pigment uniformly dispersed in the polymeric insulating material is too small, making it impossible to completely prevent internal deterioration of the polymeric insulating material. On the other hand, if the content of the organic pigment exceeds 10% by weight, the amount of arc energy absorbed increases, so that the nozzle made of the polymeric insulator is worn out and the cutting performance is reduced. According to experiments conducted by the present inventors, when a polymer insulator contains 0.1% to 10% by weight of an organic pigment, the polymer insulator is surrounded by an insulating part such as a nozzle, and a voltage of 300KV is generated. 10 at 40KV
Even after the rotation was cut off, no abnormality was detected.

In the present invention, the pigment does not necessarily need to be mixed into the entire polymer insulator, but only in the part exposed to the arc and the SFa gas insulator, that is, the surface layer, preferably within about two cabinets from the surface. Pigments may be mixed.

The attached drawing shows an example of the present invention, and in the drawing, 1 is an SF6 gas insulator, and 2 is an SF.

An insulator for guiding the gas insulator 1 to the arc, a nozzle, 3 a fixed contact (fixed electrode), 4 a movable contact (movable electrode)
, 5 is a gas compression device for spraying SF6 gas insulation onto the arc. Here, a predetermined amount of pigment is mixed into the insulating nozzle 2.

Next, the inorganic fillers, inorganic pigments, and organic pigments shown in Tables 1 and 2 were added to the insulating nozzle of the breaker shown in the attached drawings, and a breaker test was conducted. The results are shown in the same table.

(Note 1) The valve handle used contained 95% Fe2O.

(Note 2) The remarks column shows the internal condition of the insulator of the circuit breaker 10 times at a breaking voltage of 300 KV, L and a breaking current of 40 KA.

As described above, according to the present invention, it is possible to provide a breaker whose insulating portion has excellent durability even when a large current of 40 KA is interrupted, and whose initial breaking performance is maintained for a long time.

[Brief explanation of the drawing]

The drawing is a sectional view of a breaker showing an example of the present invention.

Claims (1)

[Claims] 1. A breaker comprising a fixed electrode, a movable electrode, and a polymer insulator for insulating between these electrodes, and extinguishing an arc generated when a current is interrupted by the polymer insulator and gas blowing. A breaker characterized in that the insulator contains a pigment.