摘要
接触网沿线架设,因距地面较高而易遭受雷击,可能引发动车组事故,给车载电气设备的安全运行带来威胁,因此有必要对雷击接触网时的车体过电压进行分析。文中基于高速列车电路结构,利用Pspice软件建立了一个雷击接触网时动车组车体过电压分析模型,并定量分析了直接接地方式和电阻器并联电容接地方式对车体过电压的影响。仿真结果表明:避雷器动作,雷电流主要经车体分流,导致车体电位大幅上升,受电弓所在的3、6号车体过电压幅值最大,分别约为5.07、4.90 kV;电阻器并联电容接地方式和直接接地方式均能有效抑制各车体过电压,当并联电容大于1.5 m F时,二者对过电压幅值抑制程度基本一致,3、6车过电压幅值均降为1.90 kV,相比原接地方式分别降低了62.23%、61.4%,但是在电阻器并联电容接地方式下,各车体过电压波形更为平缓。以上结论为进一步研究雷击过电压提供了理论基础。
High-speed train contact network is set up along the line, because the higher distance from the ground and vulnerable to lightning, EMU may lead to accidents, and threaten the safe operation of the car body electrical equipment, so it is necessary to carry out the overvoltage analysis for the train when lightning strikes the contact network. In this paper, based on the test of high-speed train circuit diagram, lightning process model of high-speed EMU is built by Pspice when lightning strikes a contact network, and it is analyzed quantitatively that the influence of the length of the grounding cable, grounding resistor parallel with capacitance and reduce the grounding resistance on the body overvoltage. The results of simulation show that： arrester action, the lightning current shunt mainly through the car body, the main transformer overvohage be effectively suppressed, while the car body potential increased sub- stantially, and the maximum car body potential amplitude where the pantograph is,that is 3, 6 car body,is about 3,6 5.07 kV, 4.90 kV when parallel capacitor greater than 1.5 mF, grounding mode that resistor paralleled capacitor and di- rectly grounding can effectively inhibit the overvohage of each car body, and inhibition of the same, either way the overvohage t maximum car is 3,6 car,and they are reduced to 1.90 kV, compares to the original grounding mode re duces 62.23%, 61.4%, but in the way of parallel capacitor, and waveform is flatter. The conclusions provide the- oretical basis for further researching lighting overvoltage of high-speed train.
出处
《高压电器》
CAS
CSCD
北大核心
2017年第10期44-49,共6页
High Voltage Apparatus
基金
国家自然科学基金(U1234202)
国家自然科学基金(51325704)~~
关键词
高速列车
雷击
接触网
过电压
接地系统
high-speed train
lightning strike
contact network
overvoltage
grounding system
