Research method for high voltage cable terminal joint

Abstract

The invention relates to a research method for a high voltage cable terminal joint. The method comprises following steps of S1), designing the integral structure shape size of a semiconductive stress cone component; S2), replacing the cone shape curve of the stress cone by using an arc spline curve approximation method; discretizing a plane curve into a set of range of points according to a certain step pitch; fitting the set of range of points by using an arc spline curve; successively calculating the distance d from the common tangent point of every two arcs to the original curve; executing a step S3) if the d is greater than a given error value Delta; executing a step S4) if the d is smaller than or equal to the given error value Delta; S3), interposing a new type value point on the original curve at a position corresponding to the shortest distance; fitting again by using the arc spline curve; returning to the step S2); S4), establishing a stress cone finite element two-dimensional calculation model; S5), carrying out finite element calculation; obtaining an electric field intensity partial vector diagram and an electric field intensity partial cloud diagram of the cone curve of the cable terminal joint; and verifying electric field distribution uniformity and reasonability of the terminal joint by a relationship diagram.

Description

technical field [0001] The invention relates to the technical field of high-voltage cable terminal joints, in particular to a finite element calculation method for high-voltage cable terminal joints and a method for infinitely approaching stress cone-cone logarithmic curves using arc spline curves. Background technique [0002] The high-voltage cable terminal joint is the interface between the cable and other external electrical equipment, and it is also the weak point of the power cable line. In the statistics of power cable failures, the failure rate of cable accessories is about 70%. China's high-voltage and extra-high-voltage cable accessories production technology has always lagged behind its cable body. 110kV level cable accessories, both domestic and imported, domestic cable accessories are gradually monopolizing the market, but there are not many manufacturers that can produce 220kV cable accessories, and the key technologies of accessories are not enough. In recent...

AI Technical Summary

Problems solved by technology

This method will lead to a series of problems such as large amount of data, poor accuracy, uneven feed speed, and complicated programming when processing complex curves, which will inevitably have a great impact on processing quality and processing cost.

Many scholars at home and abroad have begun to seek a method that can infinitely approximate and fit complex free-form curves and surfaces. In recent years, although some research results have been achieved, they are not close to ideal.

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