SU609761A1 - Electric insulating oil - Google Patents

Description

The invention relates to insulating oil compositions used as a heat conductor of necks and electrically insulating medium in oil-filled electrical equipment: transformers, capacitors, cables, etc. The insulating oil containing a metal deactivator is an aromatic amine of the general formula R2HdeH- | H2 or COOH; RI is R4 alkyl, and the antibiotic-triphenyl-o6-naphthylamine and phenyl naphthylamine. However, when oxidized, amine deactivators tend to form products that are insoluble in petroleum oils. The latter leads to an increase in the sedimentation of the oil during aging. It is also known insulating maset, for example, transformer, which is a mixture of oil purified in the usual way and 5-95% of the product, boiling benzene with an aliphatic olefin. The addition of alkyl aromatic hydrocarbons to insulating oils is mainly to increase their gas resistance and does not provide the necessary antioxidant stability of the oil. At the present time, all domestic transformer and part of condenser and cable oils are produced on the basis of petroleum oil with the addition of O, 2-0.5% by weight of antioxidant additive - 2,6-di-tert-1-4-methyi11phenol (ionol ) || h. During oxidative aging, these oils, under the influence of an electric field, can even with small values of acid number and sedimentation to increase the dielectric loss tangent to unacceptably high values. The dielectric loss tangent is one of the main indicators of the quality of insulating oils and characterizes the power loss in electrical equipment due to the conductivity of the oil. Electronol pnonvye maspa must have low values of this indicator in its original form and not increase it with aging during operation. The increased stability of this is; Aatep is ultimately aimed at improving the service life of the masp in an epec-equipment.

Whole acquisitions are an increase in the stability of the dielectric loss tangent of electrically insulating oil during aging and a prolongation of its service life.

This goal is achieved by the fact that an electrically insulating oil based on petroleum oil with the addition of an additional ionor 40 contains quinizarv in the following ratio of components, wt.%:

Iono 0.1-0.5

Hniaarin 0.01-0.10

oil maslodo 10O

Four samples of electrically insulating oil based on oil obtained from distillate and low-sulfur paraffin oil were prepared by phenol purification, low-temperature dewaxing and subsequent contact purification.

The oil has the following characteristic;

Kinematic viscosity at

50 ° C, eats

8.5 Flash point in closed crucible, С Density at 20 ° С, g / cm

0.856

Or minus 46

Pour point, С Content of aromatic fractions, determined by separation on silica gel,% 15 The amount of ionol and quinizarin in samples of electrical insulating oil is given in Table. one.

Table 1

1 2 3 4

The obtained oil samples are tested in a glass device at 95 i О, 2 ° С, under the influence of an electric field with a strength of 2.5 kV / mm, in the presence of copper, 0,01 0.02 0.12 0.1

Ralee with a surface of 1.5 oils and free access of air to the surface of the oil.

Claims (3)

The test results are presented in Table. 2. 7 These data show that electric oil containing 0.2 wt. % of ionol, with aging, has a high dielectric loss tangent even at very low values of j x acid number and low sedimentation. In addition, an oil containing ionol and quinizarin, with the same values of acid numbers and the same formation of sediment (and therefore the same oxidation depth), has many times lower values of the dielectric loss tangent. Oils based on petroleum oils containing ionol and quinizarin can be used as transformer, cable and condenser oils. Claims. An oil based oil insulating oil containing 2,6-di-tert.-butyl-4-methylphenol, characterized in 6097 1о ® in order to increase the stability of the dielectric loss tangent during aging and prolong the life of the oil, additionally contains quinizarin in the following ratio of components, weight,%: 2,6-Di-tert-butyl-4-methylphenol 0.1-0.5 Quinizarin 0.01-0.10 Petroleum oil Up to 100 Sources of information accepted into account in the examination: 1. Patent of England No. 772491, cl. 91 F, 1957. „p l xg i og, / lg.o-7 / -1glm 2. Patent of France No. 120О927, C. SUM, 1959, 3. Chemistry and technology of fuels and oils 1972, No. 12, 18-22.