Power Distribution Design Of Yangjiadun Station In Hangzhou Metro Line 4

As the growth of the national economy rapid,sustained,stable,comprehensive strength of the cities also gradually enhanced,the speed of urban development is becoming more and more quickly.Urban agglomeration,urban area is continuously expanding,the increase of total travel,travel distance,rely on conventional buses and taxis,have been unable to meet the residents' travel demand,and with the number of private cars increased significantly,urban road congestion is increasingly serious,travel efficiency greatly discount.The construction of the large capacity of rapid rail transit become the main technology policy to solve the traffic problems in the city.Among them,the power supply is a foundation to ensure the normal operation of the subway,safety,power supply measures of economy is the pursuit of the goal of the electrical design of subway project.Yang Jia Dun station of Hangzhou metro line four second stations,located in Pu Road and Kennedy Tower Road intersection,along the road to the north and south Pu set as the standard.The underground station inside the subway station of electric equipment than the general engineering,many kinds of large load,high level,and higher demand of control need electrical design.And perfect to meet the demand of electric power station,to achieve the normal operation of the subway station.In this paper,Yang Jia Dun station as the design object,first through the analysis of all kinds of load station(including HVAC fan electricity,water supply and drainage for pump,escalator electricity and communication signal monitoring,alarm and other types of electric load requirements)power requirements and control for load calculation,selection of transformer the appropriate specifications,and the division of low-voltage distribution circuit,completed the selection and configuration of protection components of the low-voltage power distribution cabinet and cabinet design;secondly,choose from the low pressure switch cabinet specifications and types of power cable to the electrical equipment of the mouth,which according to the calculation of short-circuit current,cable pressure loss check,drawing power distribution plan.Including the bridge layout,cable route table,bill of quantities;thirdly,comprehensive grounding design of the station.The station through the geological survey data,according to the site soil resistivity test report comprehensive grounding The grounding terminal is arranged at the appropriate position of the station,and the grounding passage is formed to meet the requirements of the grounding resistance.Due to the engineering design interface division,only part of the power distribution design for the actual project implementation standard,substation design and integrated grounding design are not part of the scope of the actual project.To ensure the integrity of the paper and the full,I still take Yang pier station as an example,designed according to the conventional practices of domestic subway.And put forward some own thinking on the current practice,inadequacies also hope to correct.