Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 2
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

The aging of composite insulators in outdoor operation for a long time has a direct impact on the safe and stable operation of the power grid. To solve this problem, fuzzy comprehensive evaluation of composite insulators based on level difference maximum is proposed. To verify the feasibility of this method, insulators in Xinjiang are sampled and the index evaluation system for composite insulators is established based on electrical, mechanical, hydrophobic and other properties, combined with operational years, geographical environment and other factors; Firstly, different membership functions are established according to index types. It is more likely to determine the grade of insulator by comparing measured data with the boundary value. Then, to solve the problem that weights cannot be effectively integrated in the combination weighting, level difference maximization is proposed (during the operation of insulators, the index which has a greater influence on the performance of insulators takes a higher proportion of the weight). Finally, on the basis of fully considering the clarity and ambiguity of grade division, the grade state of insulators is obtained by using the linear weighting method. The results show that compared with the traditional method, the improved method of the membership function and level difference maximum can realize the dynamic adjustment of the index based on the degree of information change. The method can better evaluate the insulator grade. The case study shows that the model can accurately and quickly judge the state of composite insulators, which can be used as a reference for manufacturing and maintenance departments.
Go to article

Bibliography

[1] Liang X.D., Gao Y.F., Wang J.F. et al., Rapid development of silicone rubber composite insulators in China, High Voltage Engineering, vol. 42, no. 9, pp. 2888–2896 (2016), DOI: 10.13336/j.1003- 6520.hve.20160907025.

[2] Yuan Z.K., Degradation characteristics and mechanism of materials in composite insulator under high humidity, PhD Thesis, North China Electric Power University, Beijing (2019).

[3] Xoa Y.F., Song X.M., He J.Z. et al., Evaluation method of aging for silicone rubber of compos- ite insulator, Transactions of China Electrotechnical Society, vol. 34, no. S1, pp. 440–448 (2019), DOI: 10.19595/j.cnki.10006753.tces.L80647.

[4] Tang J., Liu Q.S., Liu J.W. et al., Evaluation of composite insulators based on fuzzy comprehen- sive evaluation, Engineering Journal of Wuhan University, vol. 52, no. 5, pp. 451–456 (2019),  DOI: 10.14188/j.1671-8844.2019-05-012.

[5] Huang X., Wang L.Y., Wang Q. et al., Grey fuzzy comprehensive evaluation model of contamina- tion state for insulators based on IFAHP with bayesian modified method, Science Technology and Engineering, vol. 20, no. 13, pp. 5135–5141 (2020), DOI: CNKI:SUN:KXJS.0.2020-13-018.

[6] Liu Y.P., Xu Z.Q., Fu H.C. et al., Insulation Condition Assessment Method of Power Transformer Based on Improved Extension Cloud Theory With Optimal Cloud Entropy, High Voltage Engineering, vol. 46, no. 2, pp. 397–405 (2020), DOI: 10.13336/j.1003-6520.hve.20190215004.

[7] Fan L., Xia F., Su H.Y. et al., Risk assessment of high voltage insulator contamination condition by cloud theory, Power System Protection and Control, vol. 40, no. 15, pp. 57–62 (2012), DOI: CNKI: SUN:JDQW.0.2012-15-014.

[8] Wang S.H., Jing H., Study on method for predicting pollution Flashover insulators in contact network, Journal of the China Railway Society, vol. 40, no. 3, pp. 58–67 (2018), DOI: CNKI:SUN:TDXB.0.2018- 03-011.

[9] Huai M.Q., Research on prediction of contamination state of insulator on catenary based on fuzzy neural network, Master Thesis, Lanzhou Jiaotong University, Gansu (2018).

[10] Yang Z.C., Zhang C.L., Ge L. et al., Comprehensive fuzzy evaluation based on entropy weight method for insulator flashover pollution, Electric Power Automation Equipment, vol. 34, no. 4, pp. 90–94 (2014), DOI: CNKI:SUN:DLZS.0.2014-04-016.

[11] Zhou Y.M., Studies on the degradation depth of silicon composite insulator in service, Master Thesis, Wuhan University, Wuhan (2018).

[12] Chen X.C., Li L.Q., Wu Z.G. et al., Research on shed properties of network operating composite insulators, Guangdong Electric Power, vol. 29, no. 6, pp. 104–108 (2016), DOI: 10.3969/j.issn.1007- 290X.2016.06.019.

[13] Yang L.G., Florian Pauli, Kay Hameyer, Influence of thermal-mechanical stress on the insulation system of a low voltage electrical machine, Archives of Electrical Engineering, vol. 70, no. 1, pp. 233–244 (2021), DOI: 10.24425/aee.2021.136064.

[14] Liu Y., Wang J.G., Han F. et al., Electrical and mechanical properties of composite insulators af- ter different operation periods, High Voltage Engineering, vol. 34, no. 5, pp. 1017–1021 (2008), DOI: 10.13336/j.1003-6520.hve.2008.05.027.

[15] Yao L.N., Wu Y.H., Wang S.H. et al., Electrical and mechanical properties of on-line compos- ite insulators, Insulating Materials, vol. 48, no. 8, pp. 23–27 (2015), DOI: 10.16790/j.cnki.1009- 9239.im.2015.08.005.

[16] Jia Z.D., Yang C.X., Wang X.L. et al., Aging characteristics of composite insulators based on hydropho- bicity transfer test, High Voltage Engineering, vol. 41, no. 6, pp. 1907–1914 (2015), DOI: 10.13336/ j.1003-6520.hve.2015.06.019.

[17] Zhang M.M., Research on evaluation Method of Insulator pollution Status Assessment Based on UV Pulse Parameters, Master Thesis, Southwest Jiaotong University, Sichuan (2019).

[18] Mao Y.K., Guan Z.C., Wang L.M. et al., Evaluation of contamination levels of outdoor insulators based on the principal components analysis of leakage current Pulse, Transactions of China Electrotechnical Society, vol. 24, no. 8, pp. 39–45 (2009), DOI: 10.19595/j.cnki.10006753.tces.2009.08.007.


[19] Ning G.T., Fang B., Qin D. et al., Design and application of comprehensive evaluation index system of smart grid based on coordinated planning of major network and power distribution network, Archives of Electrical Engineering, vol. 70, no. 1, pp. 103–113 (2021), DOI: 10.24425/aee.2021.136055.

[20] Zhou L.L., Research of methods and their application of determining the weights of attributes in fuzzy comprehensive evaluation, Master Thesis, Northeastern University, Liaoning (2014).

[21] Li G., Li J.P., Sun X.L. et al., Research on a combined methods of subjective-objective weighting and its rationality, Management Review, vol. 29, no. 12, pp. 17–26+61 (2017), DOI: 10.14120/j.cnki. cn115057/f.2017.12.002.

[22] Chen Y.C., Dai J.Y., Xie D., Comprehensive evaluation of mine ventilation system based on combi- nation weighting cloud model, Systems Engineering, vol. 38, no. 6, pp. 35–42 (2020), DOI: 1001- 4098(2020)06-0035-08.

[23] Wang L.L., Research on cleaner production evaluation index system and grade comprehensive evalua- tion methodologies of wastewater treatment plants in cities and towns, PhD Thesis, Dalian University of Technology, Dalian (2015).


Go to article

Authors and Affiliations

Sihua Wang
1
ORCID: ORCID
Long Chen
1
ORCID: ORCID
Lei Zhao
1
Junjun Wang
1

  1. Lanzhou Jiaotong University, Lanzhou, 730070, China
Download PDF Download RIS Download Bibtex

Abstract

It is not easy to make the insulators of the railway catenary for the dry and cold environment of the icy Qinghai-Tibet plateau, without causing serious ice-related flashover accidents. To study the operating status of catenary icing insulators, a two-dimensional icing model of catenary cantilever insulators was established based on the winter environmental characteristics of the Golmud station on the Qinghai-Tibet Railway. Compared different directions of ice growth, the spatial electric field distribution, and surface temperature distribution characteristics of icing insulatorswere analyzed by multi-physical field coupling simulation. The results show that as the thickness of the ice layer increases and the length of the icicle increases, the field intensity of the insulator gradually increases, and the surface temperature continues to rise. When the ice edge grows vertically downward, the electric field intensity of the insulator is the smallest, and the electric field intensity is the largest when the ice edge grows horizontally. Although the surface temperature of the insulator will rise with the increase of icing degree, it is lower than the freezing point and will not have a great impact on insulation performance. Secondly, when the cantilever insulator is arranged obliquely, the increase in the inclination angle will cause the electric field to increase and the temperature to rise slightly, so the inclination angle of the oblique cantilever should be reduced as much as possible during installation. Finally, the insulator with better insulation performance is obtained by optimizing the structure of the flat cantilever insulator.
Go to article

Bibliography

[1] Meng Hong, Qinghai-Tibet Railway: The Magical "Sky Road" on the Roof of theWorld, Party Member’s Digest, no. 11, pp. 38–40 (2019).
[2] Fofana I., Farzaneh M. et al., Dynamic Modeling of Flashover Process on Insulator under Atmospheric Icing Conditions, 2001 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, Toronto, Canada, pp. 605–608 (2001).
[3] Tavakoli C., Farzaneh M., Fofana I. et al., Dynamics and Modeling of AC Arc on Surface of Ice, IEEE Transactions on Dielectrics and Electrical Insulation, vol. 13, no. 06, pp. 1278–1283 (2006).
[4] Zhao Jiayao, Study on AC Flashover Characteristics of Nature Icing Suspension Insulator (Short) Strings, PhD Thesis, Chongqing University, Chongqing (2019).
[5] Zhang Zhijin, Cheng Yang, Zhao Jiayao et al., AC Flashover Performances of Artificial Icing and Nature Icing for XP-160 Insulator String, High Voltage Engineering, vol. 44, no. 09, pp. 2777–2784 (2018).
[6] Ciesielka W., Gołas A. et al., Reliability improvement of power distribution line exposed to extreme icing in Poland, Archives of Electrical Engineering, vol. 68, no. 05, pp. 1113–1125 (2020).
[7] Mhaguen N., Development of Dynamic Models for Predicting the Critical Flashover Voltage of Insulators Covered with Ice Based on Finite Element Method, Thesis of Master’s Degree, University of Québec, Canada (2011).
[8] Volat C., Farzaneh M. et al., Improved FEM models of one- and two-arcs to predict AC critical flashover voltage of ice-covered insulators, IEEE Transactions on Dielectrics and Electrical Insulation, vol. 18, no. 02, pp. 393–400 (2011).
[9] Lu Jiazheng, Xie Pengkang et al., Electric field simulation and sheds optimization of anti- icing and anti- lightning insulator under heavy icing condition, Electric Power Automation Equipment, vol. 38, no. 03, pp. 199–204 (2018).
[10] Tu Yewei, Xia Qiangfeng, Simulation of Space Electric Field Distribution Around 220 kV Porcelain Insulator String (XP-160) and the Influencing Factors, High Voltage Apparatus, vol. 48, no. 03, pp. 67–74 (2012).
[11] Qi Guiming, Wang fake, He Haicheng et al., Surface and low altitude wind field characteristics in Golmud city, Journal of Arid Land Resources and Environment, vol. 24, no. 06, pp. 118–120 (2010).
[12] Hu Yuyao, Study on Dynamic Model for Icing with Wet Growth Process and Ice Flashover Voltage Prediction of Suspension Insulators, Master Thesis, Chongqing University, Chongqing (2017).
[13] Luo Jian, The Optimization of the System Parameters and Cantilever and Positioning Device of Overhead Contact System of High-speed Railway, PhD Thesis, Southwest JiaotongUniversity, Chengdu (2017).
[14] Zhang Yuexin, Study on Catenary’s Construction Techniques in High-speed Electric Railway, PhD Thesis, Southwest Jiaotong University, Chengdu (2006).
[15] Sharma R.P., Seema Tinker et al. Effect of Convective Heat and Mass Conditions in Magnetohydrodynamic Boundary Layer Flow with Joule Heating and Thermal Radiation, International Journal of Applied Mechanics and Engineering, vol. 25, no. 03 (2020).
[16] Liao Jiajun, Yang Lin, Hao Yanpeng, Simulation of Electric Field for 110 kV Iced Composite Insulator in Melting Period, High Voltage Apparatus, vol. 51, no. 03, pp. 47–54 (2015), DOI: 10.13296/ j.l001-1609.hva.2015.03.008.
[17] Ravisha M., Raghunatha K.R., Mamatha A.L., B oundary effects on electrothermal convection in a dielectric fluid layer, Archives of Electrical Engineering, vol. 40, no. 1, pp. 3–19 (2019).
[18] Van Brunt R.J., Stochastic properties of partial-discharge phenomena, Electrical Insulation, IEEE Transactions, vol. 26, iss. 5 (1991), DOI: 10.1109/14.99099.
[19] An Dawei, Study on Needle-plate corona Discharge and Migration Characteristics of Ion Space Charge, PhD Thesis, Chongqing University, Chongqing (2017).

Go to article

Authors and Affiliations

Sihua Wang
1
ORCID: ORCID
Junjun Wang
1
Lijun Zhou
1
Long Chen
1
ORCID: ORCID
Lei Zhao
1

  1. Lanzhou Jiaotong University, China

This page uses 'cookies'. Learn more