Nuclear Magnetic Resonance Method for Analyzing Aging Status of Composite Insulators

XIA Yunfeng; SONG Xinming; HE Wei

doi:10.13296/j.1001-1609.hva.2020.02.029

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Nuclear Magnetic Resonance Method for Analyzing Aging Status of Composite Insulators

更新时间：2025-04-26

- Nuclear Magnetic Resonance Method for Analyzing Aging Status of Composite Insulators
- High VoltageApparatus Vol. 56, Issue 2, Pages: 197-201+209(2020)
- 作者机构：
  
  1. 广东电网有限责任公司东莞供电局
  2. 重庆大学输配电装备及系统安全与新技术国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2020.02.029
  CLC： TM216
- Published：2020
- 稿件说明：
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[1]夏云峰,宋新明,何为.复合绝缘子老化状态核磁共振分析方法[J].高压电器,2020,56(02):197-201+209.

XIA Yunfeng, SONG Xinming, HE Wei. Nuclear Magnetic Resonance Method for Analyzing Aging Status of Composite Insulators[J]. High voltageapparatus, 2020, 56(2): 197-201+209.
[1]夏云峰,宋新明,何为.复合绝缘子老化状态核磁共振分析方法[J].高压电器,2020,56(02):197-201+209. DOI： 10.13296/j.1001-1609.hva.2020.02.029.

XIA Yunfeng, SONG Xinming, HE Wei. Nuclear Magnetic Resonance Method for Analyzing Aging Status of Composite Insulators[J]. High voltageapparatus, 2020, 56(2): 197-201+209. DOI： 10.13296/j.1001-1609.hva.2020.02.029.

摘要

复合绝缘子在电力系统中使用越来越广泛

但是随着运行时间的增长容易老化

威胁电力系统的安全运行。为了方便快捷地检测复合绝缘子的老化程度

文中设计了一种低磁场核磁共振的传感器和万向旋转夹具

专门适用于复合绝缘子伞裙护套的结构。测量样品为挂网运行不同时间的硅橡胶复合绝缘子

采用CPMG脉冲序列激励

得到样品的CPMG回波衰减数据。采用反拉普拉斯变换法对测量的CPMG回波信号进行反演

以横向弛豫时间作为反映复合绝缘子老化状态的特征量

并与红外光谱法测量结果进行对比。结果显示:复合绝缘子核磁共振测量结果与红外光谱内外层吸收峰吻合

两种结果在一定程度上都能反映复合绝缘子的老化程度。其中随着绝缘子的老化程度越高

核磁共振的T2值越小

红外光谱的吸收值也越低。

Abstract

To rapidly measure the aging degree of insulators

we designed a low-field nuclear magnetic resonance（NMR）sensor with universal clamp according to the structure of the composite insulator.The insulators with different service years were measured

and the Carr-Purcell-Meiboom-Gill（CPMG） pulse sequence was employed for excitation.The CPMG echo attenuation data of different samples were recorded.These CPMG data were analyzed by inverse Laplace transformation

and the transverse relaxation time was selected as the characteristic parameter of aging degree of composite insulator.The result of the NMR method is compared with that of infrared spectroscopy.It is shown that NMR result is c

onsistent with the absorption peak of the infrared spectrum

and both results can reflect the aging degree of the composite insulator to a certain extent.With development of the composite insulator aging

both the T

value of NMR and the absorption value of the infrared spectrum become smaller.

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