Journal of Shandong University(Engineering Science) ›› 2019, Vol. 49 ›› Issue (1): 114-119.doi: 10.6040/j.issn.1672-3961.0.2018.330

• Electrical Engineering • Previous Articles     Next Articles

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)

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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

CLC Number: 

  • TM411

Fig.1

Schematic diagram of the extended Debye equivalent circuit"

Table 1

Equivalent circuit parameter of T1"

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

Fig.2

The comparison between calculated values and measured values of T1 transformer polarization spectrum"

Fig.3

Comparison diagram of the influence of insulation resistance on polarization spectrum"

Fig.4

Comparison diagram of the influence of geometric capacitance on polarization spectrum"

Fig.5

Comparison diagram of the influence of small time constant branch on polarization spectrum"

Fig.6

Comparison diagram of the influence of large time constant branch on polarization spectrum"

Table 2

Parameters of equivalent circuit before and after overhaul of transformer Ta"

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 — — —

Fig.7

Contrast diagram of polarization spectrum before and after overhaul of transformer Ta"

Table 3

Table of relationship between aging factors and insulation state of transformers"

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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