Electrical conductivity measurement device and measurement system for electrical materials under different working conditions

Abstract

The invention discloses a device and a measurement system for measuring electrical conductivity of electrical materials under different working conditions. The measuring device includes a conductivity measuring mechanism, a platform, a stress loading mechanism, a temperature applying mechanism and a sample placement platform; the stress loading mechanism is used to apply stress to the sample to be tested; the temperature applying mechanism is used to apply temperature to the sample to be tested. The measurement system includes a measurement device, a data processing unit, a drive system, and a digital multimeter; the data processing unit is electrically connected to the drive system, the digital multimeter, the thermocouple of the temperature applying mechanism, and the stress sensor of the stress loading mechanism; the ceramics of the drive system and the temperature applying mechanism The heating sheet is electrically connected with the electric cylinder of the stress loading mechanism; the digital multimeter is electrically connected with the measuring lead. Based on the improved van der Pauw four-point measurement method, the invention integrates various working conditions into one measurement system, and can realize conductivity measurement under normal conditions and under different temperature or stress conditions, and the measurement results are accurate.

Description

technical field [0001] The invention relates to the field of conductivity measurement, in particular to a conductivity measurement device and a measurement system for electrical materials suitable for different working conditions. Background technique [0002] The conductivity parameter is an inherent property of the material, and is the decisive factor for the resistance parameter of electrical equipment, which can affect the loss and insulation of the equipment, and is related to the transmission efficiency and overall design of a device. For electrical equipment such as transformers and reactors, the conductivity of the magnetic material in the core has a greater impact on the eddy current loss, especially under high frequency conditions, the impact of the eddy current loss on the total core loss is more obvious; the copper wire in the winding The electrical conductivity will determine the size of its DC resistance, and the resulting copper loss will also burden the insul...

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Problems solved by technology

In a certain elastic range, the unidirectional tensile stress increases the distance between atoms and the dynamic distortion of the lattice, which in turn leads to an increase in the resistance of the material.

[0005] During normal operation of electrical equipment, due to self-heating and heat dissipation problems, the temperature of the surrounding environment rises, making the core material and windings in a higher temperature working environment. At this time, the electrical conductivity of the electrical material will be affected by the temperature, resulting in eddy currents in the core loss. The loss and winding copper loss will vary to varying degrees, and the eddy current loss will affect the temperature of the core and winding, thus forming a cycle, resulting in abnormal fluctuations in the performance of electrical equipment

On the other hand, due to the magnetostrictive effect of magnetic materials, the relevant magnetic components of the equipment will be deformed to different degrees, which will affect the electrical conductivity of the material and lead to changes in the loss of electrical equipment.

[0006] In various projects, there are few professional measuring equipment that can measure the conductivity of electrical materials under different temperature conditions and under different stress loading conditions, which cannot meet the needs of experimental research and practical work

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