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Shen H.,China Electric Power Research Institute | Chen W.,State Grid Corporation of China | Bian K.,Beijing Power Economic Research Institute | Chen K.,Shandong Xunshi Electrical Co.
Gaodianya Jishu/High Voltage Engineering | Year: 2015

In order to promote the scientific use of composite insulators in high-speed railway system and further improve the operational reliability of the catenary, the application characteristics of lightning protection for long rod suspension composite insulators used in our high-speed railway catenary was studied. Moreover, the extent that power frequency arc burns insulators and affects its short-term mechanical properties was experimentally studied, a conclusion that the arc would reduce the long-term mechanical properties of insulators was demonstrated, then a response measure was proposed and its protective effect was experimentally verified. Research results show that lightning-induced short-circuit current arc for catenary can obviously burn the ends parts of rod composite insulator and do damage to the core's sealing performance, this do not affect the short-term mechanical properties of insulator but will lead to the brittle fracture and core-pulling failure after long-running. For the line sections that may be struck by lightning, a measure with installing line metal oxide arresters or parallel gap devices at both ends of the insulators can provide reliable protection to eliminate the operational security risk. Research results can adapt equally to the power system 110 kV and below voltage suspension composite insulators. ©, 2015, Science Press. All right reserved. Source


Bian K.,North China Electrical Power University | Chen W.,State Grid Corporation of China | Shen H.,China Electric Power Research Institute | Li C.,North China Electrical Power University | And 2 more authors.
Gaodianya Jishu/High Voltage Engineering | Year: 2013

Enhancing 10 kV overhead distribution line in its ability to resist indirect lightning is the key to improve its lightning protection performance. Therefore, we proposed a new kind of insulation tower head for protecting 10 kV overhead distribution line from lightning. The tower head is composed of post insulators, cross arms, vertical arms, insulators, and connection hardware. The post insulator is used for increasing the insulation level against ground of three phases together, economizing the proposed tower head. Moreover, we calculated the indirect lightning flashover rate of the lines with different insulation levels. According to the calculation results and considering the techno-economics, in accordance with the standard of decreasing the lightning flashover rate by 96%, the lightning impulse withstanding value (LIWV) of insulation tower head was determined to be no less than 400 kV. Base on the mechanical analysis, the bending strengths of post insulator and connection hardware had to be able to withstand the bending moment produced by the horizontal force from three-phase conductors with 1955 N on each phase. The developed insulation tower head has passed lightning impulse discharge tests and bending tests, which indicates that its technical performances meet the design requirements. Furthermore, the product have been adopted in two 10 kV overhead distribution lines in Guangdong and Guangxi, China, showing a good lightning protection performance. Source


Chen W.J.,State Grid Corporation of China | Gu S.,Tsinghua University | Gu S.,State Grid Electric Power Research Institute of China | He J.,Tsinghua University | Yin B.,Shandong Xunshi Electrical Co.
IEEE Transactions on Power Delivery | Year: 2010

The breakage of overhead covered conductors on distribution lines resulting from the short-circuit arcs caused by lightning flash becomes a challenge as the application of covered conductors increases on distribution lines. Based on various methodologies and devices developed to avoid the covered conductor breakage in the world, novel arc-guided devices, including arcing protection hardware with barbs, clamping post composite insulator, and barb electrode clamping post porcelain/composite insulator are presented in this paper. Experimental results are also presented to validate these new developed devices. Devices based on the developed technologies have been widely applied on the power grids in China successfully. © 2009 IEEE. Source


Bian K.,North China Electrical Power University | Chen W.,State Grid Corporation of China | Shen H.,China Electric Power Research Institute | Li C.,North China Electrical Power University | And 5 more authors.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2013

In China, viaduct sections are widely adopted in high-speed electrified railway lines and most of the lines go through strong lightning activity areas. This leads to high lightning stroke failure rate of traction power supply catenary. To install metal oxide surge arrester with series gap (GMOA) parallel with insulators is an ideal lightning protection measure to solve the problem. In the paper, a kind of arrester and insulator integral mounting structure type was put forward, U-shaped clamp was specially designed to enhance the stability of the installation, an arrester body pressure release structure was presented to release the short-circuit energy effectively, the primary parameters of MOA body and the distance of series gap were selected, the test methods and conditions of short-circuit test and vibration test were provided, and the samples proved reliable by the results of lightning impulse test, short-circuit current test and vibration test. Three kinds of GMOA products with positive feeder/contact wire/strengthened contact wire insulators were successfully developed (obtained national patents of invention) and have been used in catenary in the Beijing-Shanghai high-speed railway, and the running of the products have been going well up to now. © 2013 Chin. Soc. for Elec. Eng. Source

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