Effectiveness Analysis and Temperature Effect Mechanism on Chemical and Electrical-Based Transformer Insulation Diagnostic Parameters Obtained from PDC Data
Abstract
:1. Introduction
2. Experimental Specimens and PDC Measurement Platform [4,11]
2.1. Preparation of Experimental Specimens
2.2. PDC Measurement Platform (Three Electrode Test Cell and DIRANA Using the PDC Measurement)
3. Measurement Results of Polarization and Depolarization Current (PDC)
3.1. Polarization Current
3.2. Deolarization Current
4. Chemical and Electrical-Based Transformer Insulation Diagnostic Parameters Obtained from PDC Data
5. Temperature Effect Mechanism Together with Effectiveness Analysis on Chemical and Electrical-Based Transformer Insulation Diagnostic Parameters
6. Conclusions
- (1)
- The magnitudes of polarization/depolarization current obviously decrease with a decreasing insulation temperature. Moreover, the ‘inflection point’ of polarization/depolarization currents will occur with insulation temperature decrease. This inflection point phenomenon seems to be related to the relaxation time constant with temperature dependant. The inflection point will migrate from smaller measurement time point to larger measurement time point with an insulation temperature decrease.
- (2)
- The chemical and electric-based transformer insulation diagnostic parameters reported in this work can be calculated from PDC measurement and their effectiveness can be effectively verified by the activation energy obtained from the well-known Arrhenius relationship between paper conductivity/insulation resistance and absolute temperature. Moreover, the fluctuation range of the activation energy using the linear relation between lnR60s (T) and 1/T is smaller than using the linear relation between lnσpaper (T) and 1/T due to the better goodness of fit on fitting curves between lnR60s (T) and 1/T.
- (3)
- The temperature effect on paper conductivity and insulation resistance can be effectively eliminated by using the well-known Arrhenius equation. The two parameters are suitable for field application. While the absorption ratio and polarization index obtained from polarization and depolarization current measurement are irregular and it is indicated that these parameters are not suitable for field application.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Insulation Status | Ea (kJ/mol) |
---|---|
Ageing 0 day (DP = 1285), water content 4.02% | 93.75 |
Ageing 8 days (DP = 994), water content 2.82% | 112.70 |
Ageing 21 days (DP = 841), water content 3.71% | 98.19 |
Ageing 42 days (DP = 415), water content 1.17% | 135.59 |
Insulation Status | Ea (kJ/mol) |
---|---|
Ageing 0 day (DP = 1285), water content 4.02% | 94.00 |
Ageing 8 days (DP = 994), water content 2.82% | 95.54 |
Ageing 21 days (DP = 841), water content 3.71% | 104.78 |
Ageing 42 days (DP = 415), water content 1.17% | 110.19 |
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Zheng, H.; Liu, J.; Zhang, Y.; Ma, Y.; Shen, Y.; Zhen, X.; Chen, Z. Effectiveness Analysis and Temperature Effect Mechanism on Chemical and Electrical-Based Transformer Insulation Diagnostic Parameters Obtained from PDC Data. Energies 2018, 11, 146. https://doi.org/10.3390/en11010146
Zheng H, Liu J, Zhang Y, Ma Y, Shen Y, Zhen X, Chen Z. Effectiveness Analysis and Temperature Effect Mechanism on Chemical and Electrical-Based Transformer Insulation Diagnostic Parameters Obtained from PDC Data. Energies. 2018; 11(1):146. https://doi.org/10.3390/en11010146
Chicago/Turabian StyleZheng, Hanbo, Jiefeng Liu, Yiyi Zhang, Yijie Ma, Yang Shen, Xiaochen Zhen, and Zilai Chen. 2018. "Effectiveness Analysis and Temperature Effect Mechanism on Chemical and Electrical-Based Transformer Insulation Diagnostic Parameters Obtained from PDC Data" Energies 11, no. 1: 146. https://doi.org/10.3390/en11010146
APA StyleZheng, H., Liu, J., Zhang, Y., Ma, Y., Shen, Y., Zhen, X., & Chen, Z. (2018). Effectiveness Analysis and Temperature Effect Mechanism on Chemical and Electrical-Based Transformer Insulation Diagnostic Parameters Obtained from PDC Data. Energies, 11(1), 146. https://doi.org/10.3390/en11010146