SU589240A1 - Method of preparing dehydrated trichlordiphenyl - Google Patents

Description

(54) METHOD FOR PRODUCTION OF DEGREED TRICHLORODIPHENYL

. one

This invention relates to a process for the production of dehydrated tricipordiphenip used to impregnate dielectrics, such as capacitor paper.

 The key to the performance characteristics of capacitors is the dielectric loss tangent. The energy loss in a capacitor is the sum of the energy losses in the main dielectric, for example paper, when it comes to paper capacitors, and in the auxiliary dielectrics used in the design of the capacitor from the case, etc.).

Trichlorodiphenyl is the most common impregnating mass for paper dielectrics in capacitors.

A known method for producing an isolating trichlorobiphenyl by treating it with alumina, which contributes to the complete removal of water adsorbed by grichlorodiphenyl, and thereby reducing the value of the dielectric loss tangent.

The disadvantage of this method is the rather high T value of the trichlorobiphenyl obtained.

There is also known a method for producing a dewatered electrically insulating impregnating material, including trichlorobiphenip, by heat treatment at a temperature of from 7 ° 8 ° C to 14 ° -15 ° C. a decrease in the tangent of the dielectric loss angle of a dielectric impregnated with it.

Although heating trichlorodiphenyl to a temperature of 14 ° -15 ° C causes intensive removal of water adsorbed by trichlorodiphenyl, it is not possible to completely remove adsorbed water. This is due to the fact that according to the well known method only water is removed from trichlorodiphenyl, whereas trichlorodiphenyl contains more chemically bound water that negatively affects the dielectric loss tangent of the capacitor, and is not removed in a known manner. The improvement of the electrical properties of the chain pro- / cta in the method of obtaining both equilibrated trichloride biphenyl for impregnating dielectrics of capacitors in the heat treatment trichporeiphenyl heat treatment is proposed to be carried out at 155–25 ° C. trichlorodifent of all types of moisture, which, during the operation of a condenser, can cause the dissociation of impurities contained in paper, to ions, which are the main cause causing energy losses in the end densator PRI me R 1, In a glass with a capacity of 1 l pour O. Zltrichlorodiphenip ci6S 0,0186. A glass with trichlorobiphenyl was placed in a drying oven and the heating was carried out for 48 hours at 155 C. The tangent of the dielectric loss angle after treatment was equal to O and ОО12. Example 2. Unlike example 1, trichlorodiphenyl is heated for 48 hours at 17 ° C. Example 3. Unlike example 1, trichlordium (heated to 190 ° C for 30 hours. Example 4. Unlike example 1, trichlorodiphenyl is heated to 22 ° C for 1O hours. Table 1 gives the values of the tangent of dielectric loss of trichpordiphenyl, The values of the resultant SOUTH trichlorobiphenip and trichlorodiphenyl prepared according to a known method are given for comparison according to examples 1-4. From the data of Table 1 it follows that the proposed method provides a decrease in the dielectric loss tangent of trichlorobiphenyl compared to untreated, depending on the heating temperature used, is 15O-35O times (while the known method provides a decrease of 6O). Table 2 gives the values of the tangent of dielectric loss angle of paper with low dielectric losses produced under industrial conditions. (The paper is taken in a dry condition and impregnated with trichlorohyphenip, prepared according to a known method and prepared.) A test paper of 1.2 g / cm, made of electrical insulating cellulose, was tested. 2 shows that the paper impregnated with trichlorobiphenyl prepared according to the proposed method has a much smaller value of the dielectric loss tangent. A similar pattern is observed if the trichlorobiphenyl prepared in accordance with the invention is impregnated with paper containing salts of magnesium, manganese, potassium, c-fonts, and zinc. The data are given in table 3. Before the known method of preparing trichlorodiphenyl for impregnating a dielectric in capacitors, the proposed method provides trichlorodiphenyl with lower values of the day tangent of electrical losses, which entails a decrease in the dielectric loss tangent of the impregnated dielectric. Under the recommended heat treatment conditions, the physical and chemical properties of trichlorodipeimel remain almost unchanged, and the dielectric properties are improved by removing traces of water. The properties of trichlorodiphenyl used for the experiments and obtained after the tests are presented in table. 4 O, 0012 O, OOO7 0.0007 0.0186 Method of preparation Without impregnation, in the female O, O017 Impregnation with trichlorobiphenip, prepared in accordance with the known method 0, GO31 Impregnation. Impregnation with trichlorodiphenyl prepared according to a known method .0.0029 Impregnation with trichlorodiphenyl prepared according to the proposed method 0.0022.

Table 1

table 2

Table 3 The values of the tangent of dielectric loss angle O.OOOS OOOZ at a temperature of 120 ° С 0, О015 0.0018 О, ОО14 0, ОО16. O. OZOO 0.0032 0.0029 O, 0031 O, O023 0, OO21 O, 0023 OjO019 O, OO18 O, OO17 0.0018 0.0034 O, OO32 0, OO32 O, OO34 0.0029 0, OO25 O , O025 0, O02

Content of mobile hpor,%

Claims (1)

Breakdown voltage of 65 C, kV / mm. The claims of the method of obtaining dehydrated tryusp / shfemla by heat treatment, about t l and h Table 4 out out 1: 0 22 by the fact that, in order to improve the insulating properties of the target product, the heat treatment is carried out at 155 25 ° C.