SU1432429A1 - Device for testing electric insulation materials for resistance to partial discharges - Google Patents

Abstract

The invention relates to a technique for testing electrical insulation materials used in insulating structures of electrical products and the radio engineering industry. The purpose of the invention is to expand the field of application of the device is achieved by the ability to perform tests for the resistance of electrical insulating materials to the effects of partial discharges in gas inclusions of any geometric shapes and sizes. The device contains electrodes 1 and 2 placed in parts of a detachable form 3 of electrically insulating material forming a cavity 4, on the surface of which test material 5, capacitor 6, high voltage source 7, high resistance 8 and measuring 9 resistors, closed chamber 10 are applied. , a displacement unit 11, a vacuum pump 12, a gas release unit 13 and a gas analysis unit 14. The device allows to choose the type of electrically insulating material for its resistance to partial discharges based on obtaining objective information about their destruction in gas inclusions of real form, to monitor the manufacturing technology of the insulating structure and its quality. 1 il. (C l 00 yu uk yu

Description

The invention relates to a technique for testing electrical insulating materials for resistance to the action of partial discharges arising in the gas inclusions of insulating materials used in the insulating structures of electrical and radio products.

The purpose of the invention; - - expansion of the application area of the device due to the ability to carry out tests on the resistance of electrical insulating materials to the effects of partial discharges in gas inclusions of any geometric shapes and sizes.

The drawing shows a diagram of the device.

The device contains electrodes 1 and 2 placed in parts of a detachable form 3 of electrically insulating material, forming a cavity 4, on the surface of which is applied a test electrically insulating material 5, a capacitor 6, a high voltage source 7, a high resistance 8 and a measuring 9 the resistors in the closed chamber 10, the displacement unit 11, the vacuum pump 12, the gas inlet block 13 and the gas analysis unit 14, the electrodes 1 and 2 connected to the terminals of the capacitor 6 and through the high-resistance 8 and measuring 9, respectively, the resistors are connected to the first and second the terminals of the high voltage source 7, the second terminal of the latter is grounded, the moving unit 11 is mechanically connected to the electrodes 1 and 2, the chamber 10 is closed, in which the electrodes 1 and 2 are placed, is connected to a vacuum pump 12, the gas inlet unit 13 and the gas inlet 14 Anapiz. The cavity 4 has the shape of an ellipsoid of rotation.

The device works as follows

By means of the gas inlet unit 13, the chamber 10 is filled with a gas mixture simulating the composition of the gas in a real gas inclusion. The vacuum pump 12 sets the pressure in the chamber 10 so much less than the gas pressure in the real gas connection, as many times the geometrical dimensions of the latter are smaller than the dimensions of cavity 4. Parts of the detachable form 3 from the electrically insulating material combine one with the other with the aid of unit 11 include 7 high voltage source. After 6 capacitor behind

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with

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rp to a voltage value determined by the electrical strength of the tested electrically insulating material 5 in gas inclusions, partial discharges 4p occur in cavity 4, the electrical parameters of which control, measuring the voltage drop across the measuring resistor 9. Gases released during fracture The tested electrical insulation material 5 is examined by gas analysis unit 14.

Since the magnitude of the voltage at which 4P arises in the sample under test, as well as their intensity depends not only on the type of electrically insulating material, but also on the size and shape of the gas inclusions in it and jOT of gas pressure in the latter, the pressure change gas and geometrical dimensions, as well as the shape, can be varied over a wide range of the power of partial discharges spent on the destruction of an insulating material, obtaining quantitative regularities for any shapes and sizes of gas inclusions in real insulation design structures.

The application of the proposed device allows to choose the type of electrical insulation materials used in insulating structures, according to their resistance to partial discharges on the basis of obtaining objective information about their destruction in gas inclusions of real shape, determining the composition and pressure of gases, the atmosphere of which should be carried out technological production of insulating structures that provide the greatest resistance of electrical insulating materials to the action of partial discharges in gas li ne, determine the most dangerous forms and sizes of gas inclusions under predetermined operating voltage to an insulating structure that allows for control of the manufacturing technology of an insulating structure and its quality.

Claims (1)

Invention Formula A device for testing electrically insulating materials for durability - To partial discharges containing elec. 3 1432429 trodes, high voltage source, vacuum pump, gas inlet unit, capacitor, high resistance and measure gas analysis unit, and detachable form separate electrodes, moreover, the electrodes of the electrically insulating material are connected to the capacitor side of the capacitor to form the closed cavity, and through the corresponding high-resistance and electrodes placed in the thickness of the parts Measuring resistors with the first and detachable forms from an electrical insulator of the second source from a high material, the latter are installed voltage, the second vyshod last of the camera with the ability to move grounded, different from each other, and vacuum By the fact that, in order to expand the region, the pumping unit, the gas inlet unit and the gas application unit, a chamber is inserted into it, the container is connected to the chamber.