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Oil-paper insulation space charge calculation method and system based on time-step transient up-flow finite element

A technology of oil-paper insulation and space charge, applied in design optimization/simulation, etc., can solve problems such as insulator degradation electric field, distortion, insulation system breakdown, etc.

Pending Publication Date: 2020-07-10
GUANGXI UNIV
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Problems solved by technology

As the main insulating medium of converter transformer, oil-paper insulation usually works under DC electric field, so the space charge inside the insulating material will migrate and accumulate. The existence of space charge in the oil-paper insulation system will cause the deterioration of the insulator and the distortion of the electric field. High charge accumulation and local field strengths have the potential to breakdown the insulation system

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  • Oil-paper insulation space charge calculation method and system based on time-step transient up-flow finite element
  • Oil-paper insulation space charge calculation method and system based on time-step transient up-flow finite element
  • Oil-paper insulation space charge calculation method and system based on time-step transient up-flow finite element

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Embodiment Construction

[0078] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited by the specific embodiments.

[0079] The embodiment of the present invention discloses a time-step transient upstream finite element based oil-paper insulation space charge calculation method, such as figure 1 shown, including:

[0080] Step S1. Collect the structural parameters and material properties of the oil-paper insulation system of the converter transformer, and establish a two-dimensional calculation domain according to the actual operating environment of the converter transformer. The two-dimensional calculation domain specifically includes: Schottky emission model and carrier Trapped, detached, compound models;

[0081] Step S2, according to the shape and parameters of the two-dimensional computational domain, divide the two-dimensional...

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Abstract

The invention relates to the field of internal insulation design and optimization calculation of a high-voltage DC converter transformer, and specifically discloses an oil-paper insulation space charge calculation method and system based on a time-step transient up-flow finite element. The oil-paper insulation space charge calculation method comprises the following steps: (1) establishing an oil-paper insulation space charge two-dimensional calculation domain; (2) solving a Poisson equation by adopting a finite element method to obtain electric field intensity; (3) discretizing the current continuous equation to construct a finite element form; (4) adding the influence of the temperature gradient on the carrier mobility; (5) solving a current continuous equation based on a time-step transient up-flow finite element method; (6) continuously performing iterating, and solving a solution of an equation formed by coupling a Poisson equation and a current continuous equation in each instantaneous value. According to the method, the time-step method is introduced into transient finite element calculation, so space charge numerical calculation is more accurate, convergence is better, and the method can be applied to internal insulation calculation and optimization design of the high-voltage DC converter transformer.

Description

technical field [0001] The invention relates to the field of internal insulation design and optimization calculation of high-voltage DC converter transformers, in particular to a method and system for calculating space charge of oil-paper insulation based on time-step transient upstream finite element elements. Background technique [0002] The converter transformer is the core equipment of the HVDC transmission system, and its working status is directly related to the safe and stable operation of the power grid. As the main insulating medium of converter transformer, oil-paper insulation usually works under DC electric field, so the space charge inside the insulating material will migrate and accumulate. The existence of space charge in the oil-paper insulation system will cause the deterioration of the insulator and the distortion of the electric field. High charge accumulation and local field strengths have the potential to breakdown the insulation system. With the help ...

Claims

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Application Information

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IPC IPC(8): G06F30/23
Inventor 刘捷丰张镱议石明琛
Owner GUANGXI UNIV
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