Evaluation Method for Thermal State of Extra-high Voltage XLPE Power Cable Termination

LIANG Zhengbo; XU Mingzhong; HOU Junping; WANG Lei; ZHAI Haoqi

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Evaluation Method for Thermal State of Extra-high Voltage XLPE Power Cable Termination

更新时间：2025-12-08

- Evaluation Method for Thermal State of Extra-high Voltage XLPE Power Cable Termination
- Vol. 43, Issue 2, Pages: 682-688(2017)
- 作者机构：
  
  中国电力科学研究院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：10 February 2017，
  
  Published：2017
- 稿件说明：
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LIANG Zhengbo, XU Mingzhong, HOU Junping, et al. Evaluation Method for Thermal State of Extra-high Voltage XLPE Power Cable Termination[J]. 2017, 43(2): 682-688.
DOI：

LIANG Zhengbo, XU Mingzhong, HOU Junping, et al. Evaluation Method for Thermal State of Extra-high Voltage XLPE Power Cable Termination[J]. 2017, 43(2): 682-688. DOI：

摘要

超高压（EHV）交联聚乙烯（XLPE）电缆户外终端的绝缘故障对电网的运行稳定性有重大影响

有效地评价其热状态对预判其绝缘故障有重要意义。为研究超高压XLPE电缆户外终端的热状态评价方法

分析了超高压XLPE电缆户外终端表面的热场分布特性

提出了以超高压电缆户外终端表面的最大温差为依据的热状态评价方法。按照IEC 62067:2011和GB/T 22078—2008标准要求

设计并运行了500 kV交联电缆系统的预鉴定试验。在不同环境温度下

采用红外热成像方式分析了户外终端表面的热场分布特性。结果表明:评价超高压电缆户外终端表面的最大温差

可有效减少外界环境变化对户外终端热场分析的干扰;热状态良好的超高压电缆户外终端的表面最大温差值Δθ≈1℃

热状态不良的超高压电缆户外终端的表面最大温差值Δθ1℃

Δθ值偏大提示户外终端的热状态异常。试验验证了所提出超高压交联电缆户外终端热状态评价方法的有效性。

Abstract

The insulation fault of extra-high voltage（EHV） cross-linking polyethylene（XLPE） power cable termination has a great influence on stability of power grid

and it is very important to effectively evaluate the thermal state of EHV XLPE power cable termination for forecasting insulation fault. In order to study the evaluation method for thermal state of EHV XLPE power cable termination

we analyzed thermal distribution characteristic of EHV XLPE power cable termination surface

put forward a thermal state evaluation method on the basis of the maximum temperature difference of EHV XLPE power cable termination surface. According to the requirements of IEC 62067: 2011 and GB/T 22078—2008

we designed and performed a prequalification test of 500 kV XLPE cable system

and analyzed the thermal distribution characteristic of the EHV XLPE power cable termination surface at different ambient temperatures by method of thermal infrared imaging. The results show that environmental interference of thermal field analysis can be effectively reduced by evaluation for the maximum temperature difference of EHV XLPE power cable termination surface. If the maximum temperature difference Δθ≈1 ℃

EHV XLPE power cable termination is in good thermal state

and if the maximum temperature difference Δθ 1 ℃

EHV XLPE power cable termination is in bad thermal state. If Δθ is too large

it is suggested that EHV XLPE cable termination has an abnormal thermal state. The availability of the thermal state evaluation method for EHV XLPE power cable termination is verified by experiments.

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