Measuring equipment for surface potential of film material

Abstract

The invention discloses measuring equipment for surface potential of a film material. The measuring equipment comprises a test box used for providing vacuum conditions for measurement and injecting various gases required for measurement; a heating platform arranged inside the test box and used for providing required temperature conditions for measurement; a ground electrode which is located abovethe heating platform and is in close contact with the heating platform; a pin electrode and a grid electrode arranged inside the test box; an electrostatic probe arranged inside the test box and usedfor measurement of the surface potential of the to-be-measured film material which is charged and located above the ground electrode; the grid electrode is located between the pin electrode and the ground electrode, the pin electrode is connected to a first high voltage power source, and the grid electrode is connected to a second high voltage power source. The measuring equipment has reasonable design, easy manufacture, convenient use and simple principle and can achieve measurement experiments under different temperatures and different atmospheres, and the reliability of measurement resultscan be ensured.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a measuring device for the surface potential of a thin film material. Background technique [0002] Space charges in polymer materials generally refer to trap charges, that is, charges that stay in the medium after being trapped by traps, and can also refer to polarization charges caused by inhomogeneous polarization. The existence of space charge will have an important impact on polymer insulation. The accumulation of space charge will lead to electric field distortion, causing early breakdown of the insulating medium, and causing huge safety problems to the safe operation of the power grid. Therefore, it is of great significance to study the space charge characteristics of polymers. [0003] The working temperature of many polymers is not constant, for example: cable insulation material cross-linked polyethylene (XLPE) and accessory material silicone rubber, as the condu...

AI Technical Summary

Problems solved by technology

However, it is difficult to distinguish whether the space charge obtained by the PEA test is due to electrode injection or impurity ionization, and it is difficult to give parameters such as electron / hole trap energy levels.

LIPP mainly needs to generate laser to induce the generation of pressure pulse. Usually, the requirements of laser source are relatively high and the cost is expensive.

When TSC calculates the trap charge and its energy level distribution, it assumes that the trap energy level in the material is in the form of a single energy level. Although TSC has high sensitivity to characterize dipole polarization, it is less sensitive to trap charge characterization.

However, there is currently no SPD measurement technology for different temperatures and different atmospheres

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