Evolution Characteristics and Stage Recognition Method of Surface Discharge Defects of Oil-Paper Insulation in Transformer

被引：0

作者：

Li G. ^{[1
,2
]}

Wang K. ^{[1
]}

Zhang S. ^{[1
]}

Zhao Z. ^{[1
]}

Li J. ^{[1
]}

Cheng H. ^{[1
]}

Yu X. ^{[1
]}

Wang Y. ^{[3
]}

Xie J. ^{[3
]}

Zhou T. ^{[4
]}

机构：

[1] China Electric Power Research Institute, Haidian District, Beijing

[2] State Key Laboratory of Power Transmission Equipment & System Security and New Technology(Chongqing University), Shapingba District, Chongqing

[3] Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense(North China Electric Power University), Baoding, 071003, Hebei

[4] China Electric Power Planning & Engineering Institute Co., Ltd., Xicheng District, Beijing

来源：

Dianwang Jishu/Power System Technology | 2018年 / 42卷 / 10期

关键词：

Development stage identification; Micromorphology; Oil-paper insulation; Phase resolved partial discharge; Support vector machine; Surface discharge;

D O I：

10.13335/j.1000-3673.pst.2018.0701

中图分类号：

学科分类号：

摘要：

Surface discharge is the most common partial discharge form for transformer oil-paper insulation. In this paper, the constant voltage method was used. By analyzing discharge characteristic, discharge pattern and micro-characteristics in scanning electron microscopy (SEM), it was proposed that the surface discharge process can be divided into three typical stages, i.e. initial stage (S1), development stage (S2), and pre-breakdown stage (S3). Results show that at stage S1 discharge phase is mainly distributed in the interval of 30°~90° and 210°~270°, and discharge capacity does not exceed 100pC; at stage S2, the discharge phase is mainly distributed in 0°~160° and 180°~330°, the capacity can reach 3000pC; but at stage S3, the discharge phase covers almost the second and fourth quadrants, the discharge is distributed in 0°~360°, and the discharge capacity slightly increased to 3500pC. From stage S1 to S3, results of micro-morphology show that with deepening of discharge, the insulated cardboard fibers are gradually broken and polymerized, and their arrangement is more disordered, and the surface carbonized traces extend to the electrode's outer edge and the width becomes larger. As for Hn(φ) atlas, the changing trends of skewness sk + (sk -) and steepness ku + (ku -) in the spectrum both appear as irregular U-shape, and peak numbers npeaks + (npeaks -) increase gradually. By using genetic optimization support vector machine algorithm with feature selection, 27-dimension Phase-resolved partial discharge (PRPD) statistical data of different discharge stages are analyzed. Results show that this algorithm can accurately identify different surface discharge stages and is more accurate than fuzzy k-nearest classifier (FkNC) algorithm and Back propagation neural network (BPNN) algorithm. © 2018, Power System Technology Press. All right reserved.

引用

页码：3451 / 3458

页数：7

共 27 条

[11]

Sharma K.S., Swati K., Sarathi R., Understanding the surface discharge activity with the nanofluid impregnated paper insulating material, International Conference on High Voltage Engineering and Power Systems, pp. 18-22, (2017)

[12]

Chen W., Yang J., Ling Y., Et al., Surface discharge characteristics and gas generation law in oil-paper insulation of transformer, Journal of Chongqing University, 34, 1, pp. 94-99, (2011)

[13]

Qi B., Wei Z., Li C., Et al., The phenomena and characteristics of oil-paper insulation surface discharge under AC and DC voltage, Transactions of China Electrotechnical Society, 31, 10, pp. 59-67, (2016)

[14]

Du J., Cheng Y., Zhou F., Et al., Wavelet moment features extraction of surface discharge signals on oil-paper insulation and partition of the discharge process, High Voltage Apparatus, 1, pp. 61-66, (2015)

[15]

Yang X., Lin C., Ma Z., Et al., Identification method for surface discharge stage of oil paperinsulation based cluster-multistage SVM, Guangdong Electric Power, 30, 9, pp. 104-110, (2017)

[16]

IEC 60243-1 Electrical strengtih of insulating materials test methods, (2013)

[17]

Wang Y., Zhong Z., Xie J., Et al., Influence of temperature on the surface discharge of insulating paperboard with different aging degree, High Voltage Engineering, 43, 8, pp. 2724-2732, (2017)

[18]

Zhou T., Yang L., Liao R., Et al., Diagnosis of aging condition in oil-paper insulation based on factor vectors of partial discharge and BP neutral network, Transactions of China Electrotechnical Society, 25, 10, pp. 18-23, (2010)

[19]

Jin F., Zhou Y., Liu Z., Et al., Characteristics of the surface discharge process in oil-paper insulation under combined AC-DC voltage, High Voltage Engineering, 41, 6, pp. 1965-1973, (2015)

[20]

Wang K., Li J., Zhang S., Et al., New features derived from dissolved gas analysis for fault diagnosis of power transformers, Proceedings of the CSEE, 36, 23, pp. 6570-6578, (2016)

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