SU559291A1 - Electric rolled capacitor - Google Patents

Description

one

The invention relates to radio-electronic technology and can be used to produce electric roll-type capacitors with a long life, increased, specific energy and stable characteristics in an electric field.

The electrical rolled capacitor is known, which contains plates and is located between them a three-dimensional dielectric made of paper tape or organic film impregnated with a liquid dielectric.

Known electric rolled capacitor has insufficient high life and stability of the capacitance.

The elimination of this disadvantage is achieved in that ethyl derivatives of diphenyl are used as liquid dielectric in the proposed electric coil capacitor.

The use of ethyl derivatives of biphenyl (EDF) as a liquid dielectric for capacitors is made possible due to the discovered valuable properties of the eugo product: its very good stability, non-toxicity, stability in an electric field of high electrical strength, low viscosity at

elevated temperature, low temperature frozen.

Impregnation of paper, paper-film and film capacitors with known EDFs gives a number of advantages compared with impregnation with other compounds: due to low viscosity they easily penetrate the gaps between the plates and solid dielectric, better impregnate the paper dielectric, thereby increasing the capacitor life. The high electrical strength of the EDF makes it possible to increase the intensity of the electric field, increase the specific energy of the capacitor, or, if the field is equal, and increase the efficiency of the capacitor.

EDF are gas-absorbing dielectrics with a beam 91M gas resistance coefficient than all the impregnating compositions used at the present time, which allows to calculate for an additional increase in working capacity. capacitor impregnated with this dielectric.

Small changes in the electrical characteristics of EDF (PV, E 9b) in the temperature range from -60 to-125 ° C, the chemical resistance of EDF in an electric field contributes to increasing the density of the capacitor.

On capacitors with a capacity of 0.2 microfarads with a paper dielectric was carried out favnitelnaya (Zhenka resistance impregnate their compositions to the long-term effects of an alternating electric field.

The performance of capacitors impregnated with EDF, oktol, vazalilovy oil, was evaluated by the time of the sample sample (25-30 pieces).

The tests were carried out on an alternating voltage installation (f-50 Hz) at 70 ° C and an electric field gradient in a dielectric of 40 kV / mm.

The emulsifiers impregnated with vaseline oil, out of the system (broken through) after 50 hours, but the secret octolum - after 100 hours, while the condensers, 1 ed, and V11, kept until 1 hour before the test.

Thus, capacitors impregnated with EDF have an increased efficiency in the electric field compared to impregnated oktol and petroleum jelly.

When testing solid capacitors

For 3,000 hours, a dielectric of half a tetrafluoro-ethylene film impregnated with EDF did not have a single failure in an alternating or constant electric field (a grating of an electric field of 33 kV / mm), while for similar capacitors soaked with vaseline oil, the number of failed capacitors was 17 % of the lot.

Claims (1)

Invention Formula An electric rolled capacitor containing plates and a solid dielectric made of paper tape or an organic film between them, prestitched with a liquid dielectric 11, characterized in that, in order to increase its service life and increase the stability of the capacitance, diphenyl derivatives are used as the liquid dielectric.