Composite-insulating-material frequency-domain dielectric spectroscopy testing apparatus

Abstract

The invention relates to a composite-insulating-material frequency-domain dielectric spectroscopy testing apparatus comprising a shielding box, an electrode system and a frequency-domain dielectric spectroscopy instrument. The electrode system consists of a high-voltage electrode assembly, a measuring electrode assembly and a supporting assembly. When being tested, a sample is clamped and installed at one end of a support rod. The sample is arranged between a first electrode and a second electrode, wherein the first electrode, the second electrode, and the sample are spaced; the space among the first electrode, the second electrode, and the sample is filled with air dielectrics. The frequency-domain dielectric spectroscopy instrument applies voltages signals with different frequencies on the sample by the first electrode; and the second electrode is used for measuring a current signal flowing through the sample. Because the direct contact between the sample and surfaces of the first electrode and the second electrode is avoided, the contact resistance is avoided, so that the measurement error is reduced. The first electrode and the second electrode do not need to apply pressures on the surface of the sample, so that the sample deformation during measurement is avoided and thus the measurement accuracy of the complex dielectric constant of the sample is improved. With the shielding box, the interference signal from the electrode system is shielded to guarantee the high accuracy of the measurement result.

Description

technical field [0001] The invention relates to the technical field of power equipment, in particular to a frequency-domain dielectric spectrum testing device for composite insulating materials. Background technique [0002] Silicone rubber composite insulation is mainly used in composite insulators of power equipment, and constitutes the shed sheath of composite insulators. Composite insulators have the advantages of light weight, high strength, convenient manufacturing and installation, and pollution flashover resistance. They are widely used in transmission lines, not only preventing a wide range of pollution flashover accidents, but also greatly reducing the operation and maintenance of polluted areas. And other specific work, successfully solved the problem of external insulation pollution flashover in my country's transmission lines and substations in polluted areas. [0003] Composite insulators used in EHV and UHV DC transmission lines not only need to withstand the ...

AI Technical Summary

Problems solved by technology

Silicone rubber composite insulation constitutes the main component of the shed sheath of composite insulators. The aging of silicone rubber will affect its internal microstructure, which will lead to changes in the electrical conductivity and dielectric polarization of the insulation, and affect the aging characteristics of the shed.

[0005] However, the traditional frequency-domain dielectric spectrum testing device is susceptible to external electromagnetic interference during the dielectric spectrum test, which affects the dielectric spectrum measurement results.

Moreover, the traditional frequency-domain dielectric spectrum testing device usually requires good contact between the electrode and the sample (such as composite insulating material). Because the surface of many samples is rough and uneven, it is easy to cause contact resistance with poor contact with the test electrode; some materials are soft The sample is easily deformed under the pressure applied by the electrode, which affects the accuracy of the measurement results

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