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How to test breakdown voltage after filtration of transformer insulating oil

2018/5/12 Viewers:
The oil quality test method is to determine the quality and performance of oil products. The indicators specified in the oil quality standards are closely related to the test methods adopted. Because certain indicators of oil, such as the test methods used, are different. Therefore, in order to obtain the relative comparability of results, a unified standard test method must be worked out. Therefore, in the standard test method, the principle of the method, the scope of application, the instrument used, the purity of the reagent, the test condition, the test procedure, the calculation formula and the precision are detailed, and the number of the test methods must be used in the oil quality standard to ensure the unification of the test results. One sex.

The oil test method in China can be divided into three stages. Namely, the national standard (GB). The standard (ZB. such as electric DL) and the enterprise standard (QB).15. in the test method of oil quality, what are the main principles? Oil test methods can be divided into two categories: physical and chemical test and instrument analysis. The former is the physical properties, chemical properties and electrical properties of the oil. It belongs to the category of constant analysis. The latter is used to determine the main composition, composition and some trace substances in oil.

1. constant analysis physical performance test. Because mineral oil is not a homogeneous chemical substance, it is a mixture of many different liquid hydrocarbons. The monomer composition can not be determined. The physical properties of oil can be understood as the comprehensive expression of various hydrocarbon compounds. Therefore, the condition test is usually adopted to determine the physical properties of oil. That is, the use of specific test equipment, according to the prescribed test conditions and steps to determine. (1) determination of density, viscosity, flash point, freezing point and benzene limb point of oil products. (2) chemical properties test. The principle of measurement is qualitative or quantitative analysis based on the characteristics of the related substances in the oil and some chemical reactions with certain reagents. For example, determination of water soluble acids or bases, acid value, caustic soda test and oxidation stability. (3) electrical performance test. Insulation oil, as a liquid insulating medium, is used to measure the breakdown voltage, dielectric loss factor, volume resistivity, gas evolution and so on to show the advantages and disadvantages of electrical properties. The evaluation of the electrical properties of oil is also carried out in accordance with the standard test method, and is also conditional test.