摘要
根据电气化铁路电力电缆与信号电缆铺设特点,以电磁理论为依据,提出故障电流在信号电缆芯线上产生的感应纵电动势计算公式,同时提出贯通地线与信号电缆芯线之间的的互感系数计算公式、信号电缆外皮与芯线之间的互阻抗计算公式。采用某试验段信号电缆敷设参数,在贯通地线和信号电缆平行接近长度分别为2和15km条件下,计算电力电缆故障电流在信号电缆芯线上产生的纵向感应电动势。计算结果表明:2km长信号电缆芯线总的纵向感应电动势小于430V的限值规定;在电力电缆故障电流为100A时,15km长信号电缆芯线实际的纵向感应电动势也低于430V;在贯通地线和信号电缆外皮流过相同电流时,信号电缆外皮在信号电缆芯线上产生的纵向感应电动势大于贯通地线在信号电缆芯线上产生的纵向感应电动势;从降低芯线感应电动势的角度看,信号电缆采用双端接地方式不如单端接地方式。实测结果验证了计算结果的正确性。
According to the laying routes of the power cable and the signal cable of the electrified railway and based on the electromagnetic theory,the formula was given for calculating the longitudinal induced electromotive force of the signal cable＇s core line caused by the fault current of the power cable. At the same time,the formula was presented to calculate the mutual induction coefficient between the grounding wire and the core line of the signal cable,and also the formula was put forward to calculate the mutual impedance between the sheath of the signal cable and the core line. Under the condition that the parallel length between the grounding wire and the signal cable was 2 km and 15 km respectively,the parameters for laying the signal cable of a certain test section were adopted to calculate the longitudinal induced electromotive force of the signal cable＇s core line caused by the fault current of the power cable. Calculation results indicate that the total longitudinal induced electromotive force of the 2 km long signal cable＇s core line is below 430 V,which is the upper limit. When the fault current of the power line cable is 100 A,the actual longitudinal induced electromotive force of the 15 km long signal cable＇s core line is also smaller than 430V. The longitudinal induced electromotive force of the signal cable＇s core line caused by the sheath of the signal cable is larger than that caused by the grounding wire when the grounding wire and the signal cable＇s core line have the same current. In terms of reducing the longitudinal induced electromotive power of the signal cable＇s core line,double-end grounding mode is inferior to single-end grounding mode for signal cable. The measured data have validated the correctness of the calculated results.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2010年第4期85-91,共7页
China Railway Science
基金
中国铁道科学研究院行业服务技术创新项目(TY2414-7)
关键词
电力电缆
故障电流
信号电缆
电磁干扰
纵向感应电动势
电气化铁路
Power cable
Fault current
Signal cable
Electromagnetic interference
Longitudinal induced eletromotive force
Electrified railway
作者简介
作者简介：常媛媛（1982-），女，河南洛阳人，博士研究生。
