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Bian K.,North China Electrical Power University | Chen W.,State Grid Corporation of China | Wang L.,China Railway Electrification Survey Design and Research Institute Co. | Shen H.,China Electric Power Research Institute | And 3 more authors.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2013

Because viaducts are widely adopted in china high-speed railway system, the conductors of traction power supply catenary are high, which makes the catenary suffer from lightning frequently. The paper gives a solution to the problem. Firstly, lightning overvoltage calculation models of the catenary were built, where the impulse grounding impedance equivalent circuit of the viaduct was extracted based on the Vector Fitting Method and Electric Network Theory. Secondly, the probability and characteristics of lightning outage of the catenary were analyzed, and the result shows that the probability of lightning outage of F wire is higher than T wire because T wire is shielded by F wire. Thirdly, two protection measures were proposed, One measure is to use PW wire as lightning shield wire and the other one is to install surge arresters with series gap on the insulators of F wire. Finally, it is also suggested that the equipotential connection of non-prestressed and grounding steels of the viaduct should be encouraged for getting better protection effect. © 2013 Chin. Soc. for Elec. Eng.


Li L.-P.,China Railway Electrification Survey Design and Research Institute Co. | Sheng J.-C.,Tianjin University of Finance and Economy
Journal of Railway Engineering Society | Year: 2014

Research purposes: Widely used in urban rail transit, the VVVF multiple unit trains will generate a mass of energy when they are braking. If this part of energy can be used effectively, it will be of great significance for the energy-saving and cost-reducing of the whole rail transit. At present, there are several kinds of regenerative energy utilization proposals. But difference of saving effect of different schemes is very large, and part of proposal may lead to a waste of energy. Therefore, it is necessary to combine theoretical calculation with practical measurement and make comprehensive analysis on the energy saving effect of current regenerative energy utilization proposals. Research conclusions: This paper constructs the model of rail transit traction power supply system and studies the calculation result and measurement result. The experiments show that: (1) The regenerative energy utilization rate is very high between the vehicles when no regenerative energy absorption devices are installed in traction substations. (2) Traditional proposal of putting regenerative braking resistor in traction substation may not save energy, on the contrary, it will waste energy. (3) When the capacity of electricity utilization device reaches a certain value, the additional capacity will make very little effects on energy saving effect. (4) The research results can be used in the design of rail transit traction power supply system.


Wang L.,China Railway Electrification Survey Design and Research Institute Co.
Lecture Notes in Electrical Engineering | Year: 2016

According to the lightning research results, which is based on the overhead line on viaduct in Tianjin Jinbin Light Rail Project, this paper summarizes the calculation method of lightning protection design which could be used for engineering design of ground and viaduct overhead line. Mathematics mode lightning striking on overhead line of viaduct and ground and calculation method sequence is proposed. In addition, the cases of overhead line suffered lightning in different thunderstorm days, different line height to the ground, and the overhead line out rate can be analyzed. © Springer-Verlag Berlin Heidelberg 2016.


Wang L.,China Railway Electrification Survey Design and Research Institute Co Ltd
Lecture Notes in Electrical Engineering | Year: 2016

According to the lightning research results, which are based on overhead line (OHL) on the viaduct of Tianjin-Binhai Light Rail Project, this paper summarizes the calculation method of lightning protection design which could be used for OHL engineering design on the ground and viaduct line. In addition, the cases of OHL suffered lightning in different thunderstorm days, different OHL height to the ground, and different protection measures are analyzed. Finally, engineering design guidelines of lightning protection for overhead line are presented by differentiated protection principles, which can be applied in the future in metro’s OHL on the ground and viaduct. © Springer-Verlag Berlin Heidelberg 2016.


Li H.-Q.,China Railway Electrification Survey Design and Research Institute Co. | Fan C.-L.,China Railway Electrification Survey Design and Research Institute Co.
Journal of Railway Engineering Society | Year: 2014

Research purposes: Lightning has been one of the important factors endangering safe and reliable operation of the railway. The grounding grid performance plays a particularly important role in lightning protection. In this paper, the author has established a grounding grid transient model by the electromagnetic transient analysis software and intended for quantitative analysis of typically grounding grid layout in engineering practice, to lay important theoretical basis for future lightning protection and grounding. Research conclusions: (1) The results show that the ground potential is significantly affected by the soil resistivity, lightning current amplitude and the mesh size. With increase of the soil resistivity and lightning current amplitude, the ground potential at the point of the lightning current injection will significantly improve, but due to the spark discharge of the soil. The ground potential does not increase exponentially with potential lightning current amplitude. The smaller the mesh size, the better the ground potential attenuation. For example of the lightning current 20 kA and the soil resistivity 100 Ω·m, the ground potential of the 5 m×5 m mesh decreases 22.3% compared with the 10 m×10 m mesh. (2) The study finds that the ground potential attenuation away from the lightning strike point at 15 m basically reaches the maximum, which is about 89%. And the degree of attenuation is independent of lightning current amplitude. (3) The results are mainly used for optimization program and design fields on substation lightning protection and grounding.


Tian Y.,China Railway Electrification Survey Design and Research Institute Co.
Journal of Railway Engineering Society | Year: 2014

Research purposes: Urban rail transit OCS lightning overvoltage damage is increasingly prominent. Because the power supply OCS has no standby equipment, lightning stroke will damage the equipment and thus directly influence train operation safety. Tianjin-Binhai light rail engineering is one of the most seriously lightning damaged urban transit engineering. According to the detailed status of Tianjin-Binhai line OCS, mathematical model is build. The software is applied to analyze OCS lightning flash over characteristics so as to improve OCS existing lightning protection measures and increase its ability to resist lightning disaster. Meanwhile, special lightning arrester suitable to urban transit OCS is researched and manufactured. Research conclusions: (1)Urban rail transit power supply system which takes lightning overvoltage protection measures could reduce the breakage rate of OCS insulator after thorough flash-over in overvoltage, also reduce the tripping rate of substation in a lightning stroke, which could meet both the reliability requirement of tractive power supply system and safety requirement of operation. (2)Because the protection measures to the isolator are inadequate, lightning arrester could not prevent backward flashover tripping, severe accidents and damages occur.(3)OCS insulator has low lightning withstand level, it is a valid measure to install in parallel metal oxide arrester with gap to prevent insulator lightning stroke damage.(4)OCS steel mast shall be earthed and OCS shall be installed overhead earth wire and shall approach live conductor as possible as it can, but no need to lift. (5)The substation shall adopt corresponding measures to carry out overvoltage protection against lightning stroke. (6)The research result can be applied on urban mass transit rail aspect.


Hou M.-H.,China Railway Electrification Survey Design and Research Institute Co.
Journal of Railway Engineering Society | Year: 2013

Research purposes: The suspension and fixing of the catenary under upper cover platform are different from those with the existing methods because they need to consider the impact of upper cover platform. Therefore, it is necessary to do the research on the impacts of the civil engineering requirements, construction difficulty, installation period and maintenance convenience requirement on the suspension and fixing of the catenary under the upper cover platform to determine the available catenary suspension and fixing modes under the upper cover platform. Research conclusions: The research was done on the suspension and fixing of the catenary under the upper cover platform of the Tanglang Vehicle Depot of Shenzhen metro on learning the suspension and fixing modes of the catenary in the high-speed railway tunnel. From the research, it is concluded: (1) The crossing suspension mode should be adopted to the catenary under upper cover platform of metro vehicle depot. (2) The structure of the embedded C shaped steel (channel) should be adopted to the catenary under the upper cover platform on determination of the technical parameters and requirements of the C shaped steel embedded parts. (3) The design plans of the various embedded parts corresponding to the contacting suspension and fixing (crossing fixing cable, hoist cable and cantilever, etc) and installation of the anchor and isolation switch were determined on the research. (4) From the angle of the project management, the analysis was made for the advantages of the structure of embedded C-shaped steel mode for the catenary's suspension and fixing. The proposal was made that this mode would be widely used in the catenary engineering.


Liu X.-X.,China Railway Electrification Survey Design and Research Institute Co.
Journal of Railway Engineering Society | Year: 2013

Research purposes: The 220 kV protection configuration and feeder protection configuration of the traction substation of the Beijing-Shanghai High-speed Railway and the other passenger dedicated railways are not the same, there is no a unified standard. Based on the analyses of the position of the high-speed railway's traction substation in 220 kV power grid, the problems in the current high-speed railway's 220 kV protection configuration in China and the application of the over thermal load protection, and in combination with the 220 kV transformer and line protection configuration of the power system, a suitable relay protection scheme of traction substation of high-speed railway in China is presented for providing the reference to the similar works. Research conclusions: For the high-speed railway's traction substation 220kV lines on the power system side, the double optical fiber current differential protections should be used as the main protection configuration for the whole line, and the distance protection, current quick-breaking protection, over current protection and zero-sequence current protection should be used as the backup protection. The over thermal load protections of the 220 kV traction transformer and feeders should replace the traditional timing and limiting overload protection.


Jing Y.-Y.,North China Electrical Power University | Bai H.,North China Electrical Power University | Wang J.-J.,North China Electrical Power University | Liu L.,China Railway Electrification Survey Design and Research Institute Co.
Applied Energy | Year: 2012

A novel solar building cooling heating and power (BCHP) system driven by solar energy and natural gas is proposed in this paper. The performance of the presented system is greatly dependent upon the operation strategy. The primary energy consumption (PEC) and pollutant emissions of the solar BCHP system in following the electricity loads (FEL) and following the thermal loads (FTL) operation strategies are estimated based on life cycle assessment (LCA). Furthermore, three most important energy-related environment problems and human health issues, global warming, acid precipitation and respiratory effects, are considered to assess the environmental impacts of the system. In order to evaluate the comprehensive benefits achieved by the solar BCHP system in different operation modes, grey relation theory is employed to integrate the energetic benefits with environmental performances. Finally, a numerical case of the solar BCHP system for a commercial office building in Beijing, China is applied to compare the integrated performance in the FEL operation strategy with that of the FTL operation strategy. The results indicate that the energy saving and pollutant emissions reduction potentials of the FTL operation mode are the better than that of the FEL mode. © 2011 Elsevier Ltd.


Su G.-H.,China Railway Electrification Survey Design and Research Institute Co.
Journal of Railway Engineering Society | Year: 2013

Research purposes: The coupling kinetic equations for the catenary-pantograph simulation can be built with the Second Lagrange Equation. These equations belong to the time varying system and their solutions can be obtained with the direct integration method or indirect integration method. When the Newmark integration method in the indirect integration method is used to choose the proper parameters, it belongs to an unconditional stability method and is often used in the catenary-pantograph simulation. Except the two parameters of Newmark method, the results of simulation also depend on the simulation's time interval and orders of the model. So the choice of these two parameters must be studied carefully. Research conclusions: This paper studies the choice of the integral parameters at the different train speed with the Newmark method by building the simple catenary suspension mechanics model for the catenary and pantograph system. The result shows the simulation needs an vibration stabilization process when the model order is too low, and the result is satisfied when the model order is over 150. The time interval should be the half of the critical time interval for ensuring the simulation accuracy.

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