Device, system and method for measuring space charges by using electro-acoustic (PEA) method

Abstract

The invention provides a device, a system and a method for measuring space charges by using an electro-acoustic (PEA) method. The device comprises a first electrode, a second electrode, a first thermostatic source, a second thermostatic source, a high-voltage direct current power supply, a pulse generator and a piezoelectric transducer, wherein the first electrode is used for contacting with one surface of the tested insulation material sample; the second electrode is used for contacting with the other surface of the tested insulation material sample; the first thermostatic source is used forconducting the temperature to the first electrode; the second thermostatic source is used for conducting the temperature to the second electrode; the high-voltage direct current power supply is used for transmitting the high-voltage direct current to the first electrode; the pulse generator is used for transmitting a high-voltage pulse signal to the first electrode; the piezoelectric transducer is used for detecting the acoustic signal of the tested insulation material sample, generated by the functions of the temperature gradient field, the high-voltage electric field and the high-voltage electric pulse, and is used for converting the acoustic signal into an electrical signal to output. The invention is used for measuring the distribution of the space charges in the high-voltage direct current power equipment insulation in the temperature gradient field.

Description

technical field [0001] The present invention relates to space charge distribution measurement technology in insulating materials, especially space charge distribution measurement technology for insulating materials in high-voltage DC power equipment under the joint action of internal and external temperature difference and electric field, specifically an electroacoustic pulse method space charge Measuring devices, systems and methods. Background technique [0002] In the prior art, the pulse electroacoustic method (PEA) is usually used to measure the space charge distribution of solid dielectric materials. However, the widely used system of this measurement technology can only measure at a uniform temperature at present, which brings inconvenience to how to deal with the temperature difference existing in the insulation of power equipment in actual operation. [0003] like figure 1 As shown, it is a structural block diagram of an existing PEA space charge measurement devic...

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Problems solved by technology

[0005] However, the insulating material in the DC power equipment works under the joint action of the internal and external temperature difference and the DC electric field, and the temperature nonlinearity of the resistivity of the insulating material, so the space charge and electric field distribution in the real DC equipment insulation may be different from that under the conventional uniform temperature There are large differences in measurement results, and the calculation of the electric field is also very complicated, which directly affects the reliability of DC EHV / UHV equipment

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