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山东大学学报 (工学版) ›› 2019, Vol. 49 ›› Issue (1): 114-119.doi: 10.6040/j.issn.1672-3961.0.2018.330

• 电气工程 • 上一篇    下一篇

基于老化因子的变压器绝缘状态分析

林智勇(),张达敏,仲训杲,曾建斌,张强   

  1. 厦门理工学院电气工程与自动化学院, 福建 厦门 361024
  • 收稿日期:2018-08-05 出版日期:2019-02-01 发布日期:2019-03-01
  • 作者简介:林智勇(1989—),男,福建仙游人,讲师,博士,主要研究方向为电气设备绝缘监测与故障诊断.E-mail:625720199@qq.com
  • 基金资助:
    国家自然科学基金青年基金资助项目(51407151);福建省自然科学基金资助项目(2016J01747);福建省自然科学基金资助项目(2018J05114)

Analysis of insulation state of transformer based on aging factor

Zhiyong LIN(),Damin ZHANG,Xungao ZHONG,Jianbin ZENG,Qiang ZHANG   

  1. College of Electrical Engineering and Automation, Xiamen University of Technology, Xiamen 361024, Fujian, China
  • Received:2018-08-05 Online:2019-02-01 Published:2019-03-01
  • Supported by:
    国家自然科学基金青年基金资助项目(51407151);福建省自然科学基金资助项目(2016J01747);福建省自然科学基金资助项目(2018J05114)

摘要:

为进一步研究变压器扩展德拜等效电路对变压器绝缘介质老化的影响规律,提出利用回复电压极化谱特征量建立变压器扩展德拜等效电路,并通过分析等效电路参数对回复电压极化谱的影响,获得变压器绝缘介质老化情况。通过仿真和实例分析的结果表明:大时间常数的极化支路反映变压器绝缘纸的老化情况;小时间常数的极化支路反映变压器绝缘油的老化情况。在此基础上,结合等效电路参数提出老化因子KL,以此来定量分析变压器绝缘状态,并获得老化因子与变压器绝缘状态之间的内在联系。当KL位于区间[0, 10],变压器绝缘状态良好;当KL位于区间[10, 30],变压器绝缘状态一般;当KL位于区间[30, ∞],变压器绝缘状态老化严重。

关键词: 变压器, 油纸绝缘, 等效电路, 老化因子, 回复电压

Abstract:

For further studying effect of extended Debye equivalent circuit on insulation medium aging of transformer, the extended Debye equivalent circuit of transformer was built using the characteristic of return voltage polarization spectrum. By analysis of equivalent circuit parameters' effect on return voltage polarization spectrum, the insulation medium aging of transformer was obtained finally. The simulation and examples analysis results showed that: polarization branch with large time constant reflected the aging of insulation paper in the transformer; polarization branch with small time constant reflected the aging of insulation oil in the transformer. Based on equivalent circuit parameters, aging factor (KL) was defined to analyze insulation state of transformer. The intrinsic relationship between the aging factor and insulation state of transformer was obtained. The analysis results demonstrated that insulation state of transformer was good when KL in range between [0, 10]; Insulation state of transformer was general when KL in range between [10, 30]; Insulation state of transformer was aged seriously when KL in range between [30, ∞].

Key words: transformer, oil-paper insulation, equivalent circuit, aging factor, return voltage

中图分类号: 

  • TM411

图1

扩展德拜等效电路"

表1

变压器T1等效电路参数"

极化支路 Rpi/GΩ Cpi/nF τi/s
1 0.10 2.58 0.25
2 0.27 4.64 1.23
3 0.68 11.82 8.05
4 0.61 67.93 41.51
5 0.82 200.10 164.94
6 1.56 313.97 488.16

图2

变压器T1极化谱计算值与测量值比较图"

图3

绝缘电阻对极化谱的影响"

图4

几何电容对极化谱的影响"

图5

小时间常数支路参数对极化谱的影响"

图6

大时间常数支路参数对极化谱的影响"

表2

变压器Ta检修前、检修后的等效电路参数"

极化支路 检修前 检修后
Rpi/GΩ Cpi/nF τi/s Rpi/GΩ Cpi/nF τi/s
1 0.09 0.42 0.04 0.22 0.26 0.06
2 0.12 0.96 0.11 2.09 0.17 0.39
3 0.49 0.55 0.27 8.54 0.61 5.22
4 0.17 1.88 0.32 67.97 1.25 84.83
5 1.16 4.04 4.70 89.58 12.03 1 077.74
6 9.39 7.50 70.43
7 3.64 70.02 254.66

图7

变压器Ta检修前、检修后极化谱对比图"

表3

多台变压器老化因子与绝缘状态关系表"

变压器 Cg/nF Rg/GΩ KL 绝缘状态
T1 88.80 1.12 79.29 老化严重
T2 107.53 12.72 8.50 良好
T3 127.11 12.40 10.20 一般
T4 142.89 8.29 17.20 一般
$ \vdots $ $ \vdots $ $ \vdots $ $ \vdots $ $ \vdots $
T24 103.91 19.05 5.50 良好
T25 70.18 10.34 6.80 良好
T26 40.95 2.34 17.50 一般
T27 46.40 1.55 30.00 老化严重
T28 192.19 6.18 31.10 老化严重
T29 141.47 2.08 68.00 老化严重
T30 172.71 2.56 67.40 老化严重
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