Academic Journal of Engineering and Technology Science, 2022, 5(9); doi: 10.25236/AJETS.2022.050903.
Lijun Zhou1, Ye Tian2
1China Electric Power Research Institute Co., Ltd., Beijing, China
2Electric Power Research Institute of State Grid Liaoning Electric Power Co., Ltd., Shenyang, China
With the application of covered conductor in distribution overhead lines, the grounding and short circuit faults caused by foreign objects have been eliminated. But new partial discharge problem has appeared on the surface of the covered conductors around tower head. It may cause the single-phase grounding fault and affect the power supply reliability. To increase the reliability, status monitoring must be used to prevent the faults from beginning. Currently, the partial discharge on overhead lines is usually measured by coils. It utilizes pulse currents to check whether there is a partial discharge. However, it cannot be used in status monitoring as the propagation characteristics is not clear. This paper carried out a simulation study on the propagation characteristics. By constructing a simulation model of overhead lines with covered conductor by the distribution parameters, the initial pulse current amplitude and front time transformation rule in different transmission distance is obtained. Considering different conditions such as pulse current frequency domain (10~50MHz), covered conductor height (4.5~8.0m), covered conductors’ phase spacing (0.6~1.0m), and conductor cross-sectional area (50~185mm2), simulation results show that the amplitude attenuation rate is between 1.5% and 6.3% per 100m, and the front time growth rate is between 1.5% and 5.7% per 100m. The height of covered conductor has the greatest influence on the pulse current waveform transformation, and the main frequency of the pulse current takes the second place, while the difference between the phase spacing and the cross-sectional area has less than 1% influence on transformation.
Distribution network, covered conductor, partial discharge, pulse current, propagation characteristics
Lijun Zhou, Ye Tian. Propagation Characteristics of Partial Discharge Pulse Current on 10kV Covered Conductor. Academic Journal of Engineering and Technology Science (2022) Vol. 5, Issue 9: 13-23. https://doi.org/10.25236/AJETS.2022.050903.
 L. J. Zhou et al., "Study on the Discharge Characteristic and Detection Method on the Faulty of Distribution Insulators," 2019 2nd International Conference on Electrical Materials and Power Equipment (ICEMPE), 2019, pp. 447-453, doi: 10.1109/ICEMPE.2019.8727302.
 Wang Xiaojie, Wan Xinyuan, Zheng Lingjuan, Xia Xiaojian, Deng Chaoping, “Analysis on Ablation Reason of Overhead Insulation Line at Fujian Offshore Area,” in Insulating Materials, 2021,54(03):78-83. DOI: 10.16790/j.cnki. 1009-9239. im. 2021.03.013.
 Lianyi Qu. “Research on Reason and Prevention about Ablation of Aerial Insulation Line,” in Dalian University of Technology, 2015.
 Lijun Zhou et al.. "Partial Discharge Characteristic Analysis of Distribution Network Overhead Line Based on Remote Detection," 2020 IEEE International Conference on High Voltage Engineering and Application, 2020, pp. 1-4, DOI: 10.1109/ICHVE49031.2020.9279412.
 Lijun Zhou, Yuanpeng Liang. “Distribution line inspection and evaluation report,” in Typical discharge detection and diagnosis services for overhead equipment of distribution lines, Anhui Electric Power Research Institute, unpublished, 2019.
 Yuanpeng Liang. “Study on Partial Discharge Characteristics and Defect Detection of Overhead Binding Insulated Conductor,” in Hefei University of Technology, 2021.
 Daqian Feng. “Prevention and Treatment of Molten-Conductor Accident on 10kV Overhead Power Distribution Lines,” in Guangxi Electric Power, 2006(02):58-59. DOI: 10.16427/j.cnki.issn1671-8380. 2006.02.018.
 G. M. Hashmi and M. Lehtonen. "On-line PD detection for condition monitoring of covered-conductor overhead distribution networks-A literature survey," 2008 Second International Conference on Electrical Engineering, 2008, pp. 1-6, doi: 10.1109/ICEE.2008.4553933.
 G. M. Hashmi, M. Lehtonen and M. Nordman. "Modeling and experimental verification of on-line PD detection in MV covered-conductor overhead networks," in IEEE Transactions on Dielectrics and Electrical Insulation, vol. 17, no. 1, pp. 167-180, February 2010, doi: 10.1109/TDEI.2010.5412015.
 W. Zhang, Z. Hou, H. -J. Li, C. Liu and N. Ma. "An Improved Technique for Online PD Detection on Covered Conductor Lines," in IEEE Transactions on Power Delivery, vol. 29, no. 2, pp. 972-973, April 2014, doi: 10.1109/TPWRD.2013.2288008.
 M. Shafiq, G. A. Hussain, N. I. Elkalashy, P. Hyvönen and M. Lehtonen. "Integration of online proactive diagnostic scheme for partial discharge in distribution networks," in IEEE Transactions on Dielectrics and Electrical Insulation, vol. 22, no. 1, pp. 436-447, Feb. 2015, doi: 10.1109/TDEI.2014. 004150.
 H. Li, X. Cui, H. Wang, Y. Yan, Y. Lu and K. Zhao. "A Novel Partial Discharge Locating System for 10-kV Covered Conductor Lines in Distribution Network," 2020 10th International Conference on Power and Energy Systems (ICPES), 2020, pp.379-383, doi:10.1109/ICPES51309.2020.9349708.
 Zhiguo Tang et al.. "Review on Partial Discharge Pattern Recognition of Electrical Equipment," High Voltage Engineering, 2017, 43(07):2263-2277. doi: 10.13336/j.1003-6520.hve.20170628023.
 A. B. Sukardi, M. N. K. H. Rohani, M. Isa, B. Ismail, A. S. Rosmi and W. A. Mustafa. "Modelling of single power line by ATP-Draw for partial discharge signal measurement," 5th IET International Conference on Clean Energy and Technology (CEAT2018), 2018, pp. 1-6, doi: 10.1049/cp. 2018. 1328.
 Yuan Fang. "Research on Propagation Characteristics of Harmonic in Transmission Line," Xi’an University of Science and Technology, 2017.
 Isa M. "Partial Discharge Location Technique for Covered-Conductor Overhead Distribution Lines [J]." in Aalto University Publication, 2013.
 Hongbo Zhang, Qincheng Yuan. "Application of Fault Indicator in Smart Grid," Energy Technology and Economics, 2011, 23(01): 16-20
 S. Yang, L. Wang, X. Yue and H. Li. "A High Efficient Time-domain Modeling Method for Partial Discharge Propagation in XLPE Cables with Large Length," 2021 International Conference on Electrical Materials and Power Equipment (ICEMPE), 2021, pp. 1-4, doi: 10.1109/ICEMPE51623. 2021.9509176.