Measurement system of space charge of coaxial high-voltage direct current plastic cable

Abstract

The invention discloses a measurement system of space charge of a coaxial high-voltage direct current plastic cable in the technical field of measurement. The space charge measurement system comprises four guiding screw rods, a cable clamp, a lower electrode aluminum plate, a piezo thin film, an organic glass sound wave absorption layer and a grounded metallic shielding box; wherein the upper surface of the lower electrode aluminum plate is provided with four guiding screw mounting holes, the cable clamp is provided with four through holes corresponding to the positions of the four guiding screw rods, the four guiding screw rods penetrate through the four through holes on the cable clamp and are connected with the upper surface of the lower electrode aluminum plate through the four guiding screw mounting holes, one side of the cable clamp with radian faces the upper surface of the lower electrode aluminum plate, the piezo thin film and the organic glass sound wave absorption layer arearranged in the grounded metallic shielding box, and the grounded metallic shielding box is connected with the lower surface of the lower electrode aluminum plate. By adopting line contact pattern, the invention realizes the measurement of the space charge of the coaxial high-voltage direct current plastic cable with different wire diameter and different thickness, and the system has a flat structure, simple process and convenient installation and debugging.

Description

technical field [0001] The invention relates to a system in the field of measurement technology, in particular to a coaxial high-voltage DC plastic cable space charge measurement system. Background technique [0002] The electroacoustic pulse method is a popular measurement of space charge distribution for insulation development. The electroacoustic pulse method has obvious advantages in the field of high-voltage DC plastic cable insulation development, and can observe the space charge behavior in insulating materials under high electric field strength for a long time. For the coaxial structure of the cable, the surface contact method is often used to load the actual test sample. [0003] After searching existing documents, it is found that "Progress in Space Charge Measurement of Solid Insulating Materials in Japan" published by Y.Li and T.Takada in "Electrical Insulation Magazine (Electrical Insulation Magazine)" Improvement in measurement)" provides an electrode system ...

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Problems solved by technology

[0003] After searching existing documents, it is found that "Progress in Space Charge Measurement of Solid Insulating Materials in Japan" published by Y.Li and T.Takada in "Electrical Insulation Magazine (Electrical Insulation Magazine)" Improvement in measurement)" provides an electrode system for loading samples in surface contact mode. The electrode aluminum plate in this system is processed into a fan shape to fit the outer surface of the cable insulation layer. Since the geometry of the electrode system is determined by the tested cable sample Therefore, the system is only suitable for the measurement of single-size cable samples, and the special shape of the lower electrode aluminum plate increases the difficulty of processing, and also brings great difficulties to the installation and commissioning of the electrode system

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