Entity

Time filter

Source Type


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.


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.


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.
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.


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.

Discover hidden collaborations