变压器油纸绝缘套管受潮缺陷频域介电谱特征
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

TM855

基金项目:

国家电网有限公司科技项目(SGJSDK00ZPJS1900269)


FDS characteristic of damp-affected oil-paper insulation transformer bushings
Author:
Affiliation:

Fund Project:

Technology project of state grid co., LTD. (SGJSDK00ZPJS1900269)

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    已有研究表明,频域介电谱(FDS)对油纸绝缘受潮缺陷的检测比较灵敏。为了研究变压器油纸绝缘套管受潮缺陷的FDS特征,测试了受潮后套管模型不同静置时间下的介损电压特性和0.001 Hz~1 kHz的介损频率特性。结果表明:在受潮初期,相同试验电压下介损随时间的变化呈现微弱增长趋势,但并不明显,相同时间下,介损随试验电压升高有所增长;在受潮中期,介损随时间的变化呈现明显增长趋势,并在120 h时介损达到峰值;在受潮末期,介损随着时间的增加呈现下降趋势,整个过程介损增量未超过规程规定值,可考虑降低规程规定值。在FDS的低频段0.001~0.01 Hz区间范围内可明显区分受潮套管和不受潮套管,1 mHz介损特征尤其明显。因此建议套管出厂及运行增加FDS低频段测试,利用FDS低频段特征进行套管绝缘诊断。

    Abstract:

    It has been reported that frequency domain spectroscopy (FDS) is sensitive to moisture content for oil-paper insulation. In order to reflect the characteristics of frequency domain dielectric spectrum about damp-affected defect in transformer oil paper insulation bushings, comparative study for the influence of voltage value and frequency value on dielectric loss from 0.001 Hz to 1 kHz is carried out. The results show that the value of tan δ increases slightly with time at the same value of test voltage in the first stage of the process of rising damp. At the same time, an increase of the value of tan δ is seen with the increasing test voltage. In the second stage of the process of rising damp, the value of tan δ increases remarkably with time, and reaches its peak at the time point of 120 h. At the third stage of the process of rising damp, the value of tan δ decreases with time. The value of tan δ in the whole process does not exceed the values of standard, and the value of standard is suggested to be reduced. In the low frequency band from 0.001 to 0.01 Hz, it is easy to distinguish the damp-affected bushings from the non-damp-affected bushings by frequency domain dielectric spectrum, especially at the frequency of 1 mHz. Therefore, it is recommended that FDS low-frequency test is used for insulation diagnosis.

    参考文献
    相似文献
    引证文献
引用本文

张毅涛,齐波,林元棣,沈殷和,吴益明.变压器油纸绝缘套管受潮缺陷频域介电谱特征[J].电力工程技术,2021,40(2):135-140

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2020-10-08
  • 最后修改日期:2020-11-19
  • 录用日期:2020-06-29
  • 在线发布日期: 2021-04-02
  • 出版日期: 2021-03-28