Low-field NMR Sensor Used for Measuring the Aging Status of Shed of Composite Insulators

HUANG Jianhua; XU Zheng; YANG Ting; XIA Yunfeng; YANG Wu; YIN Chuangrong; CHEN Xiyang; LUO Ruibin; HE Wei

doi:10.13296/j.1001-1609.hva.2017.05.004

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Low-field NMR Sensor Used for Measuring the Aging Status of Shed of Composite Insulators

更新时间：2025-04-26

- Low-field NMR Sensor Used for Measuring the Aging Status of Shed of Composite Insulators
- High VoltageApparatus Vol. 53, Issue 5, Pages: 22-27+34(2017)
- 作者机构：
  
  1. 广东电网公司东莞供电局
  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.2017.05.004
  CLC： TM216;TP212
- Published：2017
- 稿件说明：
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[1]黄健华,徐征,杨挺,夏云峰,杨武,尹创荣,陈锡阳,罗瑞彬,何为.测量复合绝缘子伞裙老化状态的低场核磁共振传感器[J].高压电器,2017,53(05):22-27+34.

HUANG Jianhua, XU Zheng, YANG Ting, et al. Low-field NMR Sensor Used for Measuring the Aging Status of Shed of Composite Insulators[J]. High voltageapparatus, 2017, 53(5): 22-27+34.
[1]黄健华,徐征,杨挺,夏云峰,杨武,尹创荣,陈锡阳,罗瑞彬,何为.测量复合绝缘子伞裙老化状态的低场核磁共振传感器[J].高压电器,2017,53(05):22-27+34. DOI： 10.13296/j.1001-1609.hva.2017.05.004.

HUANG Jianhua, XU Zheng, YANG Ting, et al. Low-field NMR Sensor Used for Measuring the Aging Status of Shed of Composite Insulators[J]. High voltageapparatus, 2017, 53(5): 22-27+34. DOI： 10.13296/j.1001-1609.hva.2017.05.004.

摘要

随着复合绝缘子挂网运行时间的增加

复合绝缘子的老化日趋严重。为了方便快捷地检测复合绝缘子的老化程度

文中根据复合绝缘子伞裙护套的结构特点

设计了一种U型的便携式低场核磁共振传感器。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。对CPMG回波衰减数据进行双指数函数拟合分析

得到硅橡胶伞裙材料的等效横向弛豫时间参数:t2

short和t2

long。实验结果表明

硅橡胶伞裙的t2

long参数与其老化程度有很好的对应关系

具体表现为随着绝缘子老化程度的加剧

横向弛豫时间t2

long逐渐减小。

Abstract

With the increasing of the service time of silicone rubber insulators in the power system

the aging problem of the silicone rubber insulators has been more serious. In order to measure the aging of insulators

and according to the structure of the insulators

we designed a portable nuclear magnetic resonance（NMR）sensor with a Ushape structure. The composite insulators with different service years had been measured

and a Carr-Purcell-Meiboom-Gill（CPMG）sequence was employed as the excitation. The CPMG echo attenuation data of different samples were recorded. The CPMG data were fitted with a bi-exponential function and the effective transverse relaxation time:t2

shortand t

long

were obtained. The experi

mental results demonstrate that the t

long

parameter has a high correlation with the insulator’s aging degree:an increase in the aging degree of the insulator clearly results in a decrease of t

long

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