夹具对高压绝缘电缆热学特性影响的有限元分析

doi:10.19595/j.cnki.1000-6753.tces.201003

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Abstract

The clamp is an essential component of the installed high-voltage insulated cable. In order to obtain the influence of clamp on the thermal characteristics of the cable, the electrothermic coupling finite element analysis is carried out on a typical 220kV AC single core XLPE insulated cable. According to the actual situation of cable laying in a certain city in China, the two dimensional and three dimensional electrothermal coupling finite element models of the cable under five different material clamps are established. The ampacity ratings and thermal time constants of the cable under different clamps are obtained through steady-state and transient thermodynamic calculation. The distribution law of conductor temperature in radial and axial directions is obtained by calculating the cable temperature under different clamp materials and intervals, and the relation function of the clamp material and interval with the cable conductor temperature is obtained. The results show that the material and interval of the clamps have an effect on the cable's ampacity ratings and thermal time constant. There is a critical value for the thermal conductivity and interval of the clamp, and the conductor temperature on both sides of this value varies greatly. This paper can provide theoretical and data support for cable construction and operation.

Key words： Clamp high voltage cable ampacity ratings thermal time constant finite element

Received: 07 August 2020

PACS:	TM247
	TN818

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