基于构建温度场分析的非侵入式高压电缆缆芯温度测量方法

doi:10.19595/j.cnki.1000-6753.tces.201347

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摘要针对传统的电缆缆芯温度直接或间接测量方式,存在受环境温度影响大、测量准确度差、应用成本高等问题,该文提出了一种基于温度场构建的非侵入式高压单芯电缆缆芯温度测量方法。通过在电缆护套外局部包裹隔热介质构建区域温度场及温度梯度,将隔热介质层内各温度点与环境温度的相对温度作为温度梯度关系的敏感参数,用以提取该温度梯度规律并推导其解析计算式,从而实现了利用电缆外部的多点温度,对电缆缆芯稳态热点温度的间接测量。试验结果表明：考虑误差修正的理论计算公式与数据拟合公式,对缆芯温度的求解误差在3℃以下,该测量方法成本低、使用方便,无需破坏电缆本体,即可实现对电缆缆芯稳态热点温度的实时准确测量。

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关键词 ：缆芯温度, 温度场构建, 隔热介质, 温度梯度, 间接测量

Abstract：In view of the traditional direct or indirect temperature measurement of cable, there are problems such as great influence by ambient temperature, poor measurement accuracy, and high application cost. A non-invasive temperature measurement for high-voltage single-core cables based on temperature field construction was proposed in this paper. The regional temperature field and gradient were constructed by partially wrapping the thermal insulation medium outside of the cable sheath. Relative temperature between each temperature in the thermal insulation layer and the ambient temperature was taken as the sensitive parameter of the temperature gradient relationship that can extract the temperature gradient law. The analytical calculation formula was derived, which can accomplish the indirect measurement of the steady-state temperature of the cable core by utilizing multi-point temperature outside the cable. The experimental results show that: The solution error of cable core temperature is below 3℃ by using the revised theoretical calculation formula and data fitting formula. The measurement method is economical and convenient, which can realize real-time measurement of the steady-state temperature of the cable core without destroying the cable body.

Key words： Temperature of the cable core temperature field construction thermal insulation medium temperature gradient indirect measurement

收稿日期: 2020-09-30

PACS:

TM726.4

通讯作者: 杜林男,1971年生,博士,教授,研究方向为电气设备绝缘在线监测及故障诊断。E-mail：dulin@cqu.edu.cn

作者简介: 余辉宗男,1996年生,硕士研究生,研究方向为电气设备绝缘在线监测及故障诊断。E-mail：yuhuizong@cqu.edu.cn

引用本文:

杜林, 余辉宗, 严涵. 基于构建温度场分析的非侵入式高压电缆缆芯温度测量方法[J]. 电工技术学报, 2021, 36(7): 1338-1346. Du Lin, Yu Huizong, Yan Han. A Non-Invasive Temperature Measurement Method for High-Voltage Cable Core Based on Temperature Field Construction and Analysis. Transactions of China Electrotechnical Society, 2021, 36(7): 1338-1346.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.201347 https://dgjsxb.ces-transaction.com/CN/Y2021/V36/I7/1338

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