Method for measuring pressure of insulation interface of cable terminal

Abstract

The invention provides a method for measuring the pressure of the insulation interface of a cable terminal. The invention adopts a method combining on-site measurement and numerical simulation; the spring stress of a spring compression device at the high-voltage cable terminal is directly measured on site to achieve the aim of indirectly measuring the axial pressure of the stress cone, according to the stress relationship of a rubber stress cone and the spring compression device at the high-voltage cable terminal; and an overall numerical simulation model of the high-voltage cable terminal is established, the reliability of the simulation model is checked according to the axial pressure of the rubber stress cone, and finally the distribution and change law of the insulation interface of the cable terminal are calculated according to the numerical simulation of the mechanical-electric thermal load condition. The method can be used to avoid the problem that the interface pressure can not be measured directly owning to the structure of the high-voltage cable terminal. The method is characterized by reliability, effectiveness and convenience.

Description

technical field [0001] The invention belongs to the technical field of high-voltage power grid testing, and can accurately and reliably measure the distribution and variation law of the insulation interface pressure of a high-voltage cable terminal. Background technique [0002] The power grid is an intermediate link in the transmission and distribution of electric energy. It is mainly composed of transmission lines, substations, distribution stations and distribution lines connected into a network. At present, my country's power grid is mainly based on high-voltage and ultra-high-voltage AC transmission lines. , The AC transmission network is currently the backbone power grid in my country. [0003] Among the components of the power grid, the power transmission system undertakes the task of transporting and distributing power to various power-consuming departments, and it also has the greatest impact on the operation of the power system. The power transmission system i...

AI Technical Summary

Problems solved by technology

[0006] However, since the high-voltage cable terminal is a complex structure composed of various material parts, and the structure is tight, it is very difficult to directly measure the insulation interface pressure, especially the insulation interface pressure during installation and operation. At present, there is no mature Effective measurement method, therefore, it is very necessary to have a method of measuring the insulation interface pressure during the installation and operation of high-voltage cable terminals

Images