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A method for optimizing space charge density model of insulator under high-voltage DC

A space charge, high-voltage DC technology, applied in the field of electric power, can solve the problems of rarely considering the influence of charge density, difficult to obtain the charge accumulation of DC insulators, etc., to improve the optimization effect, improve the accuracy, and ensure the effect of computing load.

Active Publication Date: 2019-03-01
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

[0005] The effects of temperature, time-varying electric field, and dielectric relaxation on charge density are rarely considered in existing experimental studies, and it is difficult to obtain the charge accumulation of DC insulators used in actual engineering

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  • A method for optimizing space charge density model of insulator under high-voltage DC
  • A method for optimizing space charge density model of insulator under high-voltage DC
  • A method for optimizing space charge density model of insulator under high-voltage DC

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Embodiment Construction

[0039] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0040] A method for optimizing the space charge density model of insulators under high voltage direct current, such as figure 1 shown, including:

[0041] Step S1: Using temperature and time-varying electric field as independent variables, the mathematical model of conductivity is obtained, and the conductance current density is obtained. The conductivity increases exponentially with the increase of temperature and electric field, specifically:

[0042] Step S11: Taking temperature and time-varying electric field as independent variables, the mathematical model of electrical conducti...

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Abstract

A method for optimizing space charge density model of insulator under high-voltage DC includes such steps as S1, taking temperature and time-varying electric field as independent variables to obtain conductivity mathematical model and conductivity current density; S2, establishing a dielectric relaxation function and obtaining a relaxation polarization current density; S3, summing that conductivity current density, the relaxation polarization current density and the instantaneous polarization current density to obtain the volume current density; 4, integrate that volume current density to obtain a space charge density data model. Compared with the prior art, the invention comprehensively considers the influence of temperature, electric field and dielectric relaxation on the space charge density, solves the problem that the prior model does not take the environmental factors into consideration, and simulates and analyzes the influence degree of each factor on the space charge density, which can be used as a reference for the material selection and structure design of the high-voltage DC insulator.

Description

technical field [0001] The invention relates to the field of electric power, in particular to an optimization method for an insulator space charge density model under high-voltage direct current. Background technique [0002] With the acceleration of China's high-voltage direct current transmission construction projects, it is very important to study some key issues under high-voltage direct current. Insulators under the action of DC high voltage for a long time tend to accumulate charges inside, which affects the electric field distribution inside the insulator and reduces the withstand voltage of the insulator. In severe cases, it may lead to a decrease in dielectric strength and bring hidden dangers to the insulation system. Therefore, it is very important to establish a mathematical model to calculate the space charge density inside the insulator. [0003] Under the action of DC electric field, the space charge accumulated inside the insulator can significantly affect t...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20Y02E60/60
Inventor 张周胜邓保家李秋烨张子晏武
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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