JPS61156605A - Oil-filled electric equipment - 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 Field of Industrial Application The present invention relates to oil-filled electrical equipment that uses nonflammable electrical insulating oil and is safer in terms of disaster prevention.

Conventional technology Conventionally, in oil-filled electrical equipment such as capacitors, cables, transformers, etc., one or a mixture of two or more arylphenyl ethane represented by the following structural formula has been used as electrical insulating oil (hereinafter referred to as insulating oil). (A) PTE (B) PEPE (C) PCE (D) PXE (E) PDEPE This arylphenyl ethane is mainly used in capacitors as an alternative to chlorinated biphenyl insulating oil, but it is different from chlorinated biphenyl. It is not a non-flammable oil, but rather a flammable oil.

Problems to be Solved by the Invention In recent years, disaster prevention measures for electrical equipment have become increasingly strict, and there has been an increasing need to make electrical insulating oil used in oil-filled electrical equipment flame retardant.

Means for Solving the Problems The present invention improves flammability by mixing vegetable rapeseed oil or soybean oil in an amount of 1% or more of vegetable rapeseed oil or soybean oil with the above-mentioned arylphenyl ethane. The aim is to provide electrical equipment.

Example The present invention will be explained below based on experimental data.

Figure 1 shows the combustion section of the oxygen index flammability test device, where 1 is a glass column, 2 is a glass piece housed in the glass column 1, 3 is a glass tube with an inner diameter of 3 mm, and one end is the glass column 1. The other end is connected to an oil sump 4, and this oil sump 4 and glass tube 3 are filled with oil 5. A drain 6 is connected to the glass tube 3, and a cock 8 is provided at the connection point. Further, 7 is a drain, which is provided at the oil sump 4. 9 is a flame.

The flammability of insulating oil was tested using the oxygen index method, which allows quantitative evaluation.

The oxygen index method is a method in which the oxygen concentration in the atmosphere of the combustion zone is adjusted using oxygen and nitrogen, and the lowest oxygen concentration at which the insulating oil ignites and combustion continues is determined and expressed as an oxygen index. This method is applied to the flammability test method for polymeric materials (JIS K 7201), and using the measuring device, the combustion section is modified to a liquid type as shown in Figure 1. The index was measured.

The oxygen index of the arylphenylethane is 18.5~
It is in the range of 20, indicating that combustion occurs in air when the oxygen concentration of the air is 21 or less. On the other hand, vegetable rapeseed oil and soybean oil have an oxygen index of 26.5 and 27.0, which is 21 or more, and are self-extinguishing oils.

It is expected that flame retardancy will be achieved by mixing this vegetable oil.

FIG. 2 shows the oxygen index of a mixed oil of rufuenyl ethane and rapeseed oil or soybean oil. It can be seen that when rapeseed oil or soybean oil is mixed with arylphenyl ethane, the oxygen index increases, and when 55 vol. The upper limit of the mixing ratio of rapeseed oil or soybean oil may be determined by considering the appropriate viscosity of the mixed oil, since the kinematic viscosity of these vegetable oils is higher than that of arylphenyl ethane. In addition, these vegetable oils contain chain unsaturated hydrocarbons such as oleic acid, linoleic acid, and lyluic acid, so they have excellent gas absorption properties (the fatty acid composition is shown in the table as an example), but they are better than arylphenyl ethane. Since this is low, the mixing ratio should be determined taking this fact into consideration.

Rapeseed oil and soybean oil may be those listed in Article 29 and Article 23 of the JAS Standards, respectively, for edible purposes, but if they are further refined with activated clay or activated alumina, the general electrical properties total acid value will improve, and insulating oil It can be used without any problem.

Effects of the Invention As described above, when 55 vol % or more of vegetable rapeseed oil or soybean oil is mixed with the arylphenyl ethane, a flame-retardant insulating oil is obtained, which has the effect of increasing the safety of oil-filled electrical equipment.

Furthermore, these vegetable oils are used as edible oils, and needless to say, they are extremely safe substances from a sanitary standpoint.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the combustion section of the oxygen index flammability test device;
FIG. 2 is an oxygen index characteristic diagram showing the flammability of mixed oil based on the mixing ratio of vegetable oil to arylphenyl ethane.

Claims (1)

[Claims] The structural formula is ▲There are mathematical formulas, chemical formulas, tables, etc.▼, ▲There are mathematical formulas, chemical formulas, tables, etc.▼, ▲There are mathematical formulas, chemical formulas, tables, etc.▼, ▲There are mathematical formulas, chemical formulas, tables, etc. There are ▼, ▲There are mathematical formulas, chemical formulas, tables, etc.▼ Aryl phenylethane electrical insulating oil consisting of one or more types ▼ and 55 vol of vegetable rapeseed oil or soybean oil.
．． Oil-filled electrical equipment that uses a mixed oil containing % or more as electrical insulating oil.