高寒季节性冻土地区接地极仿真计算及深埋施工法

Simulation Calculation and Deep Buried Construction Method of Grounding Electrode in Alpine Seasonal Frozen Soil Area

接地系统是维护牵引供电系统安全可靠运行、保障人身安全和电气设备安全的重要保护措施。若接地电阻值过大,接地体或地网点位异常升高,导致接地系统本身局部电位差超过安全值,无法迅速拉低电位保护操作者,造成重大人身伤亡。在东北地区冻土区土壤高电阻率地区接地极埋设施工,通过仿真计算快速有效地降低高寒季节性冻土地区接地阻值并保证接地电阻的稳定是施工中的重中之重,对铁路电力系统安全可靠运行、保障作业人员和电气设备安全具有非常重要的意义。深埋施工法在施工过程中取得了良好的效果,采用分层测量电阻率通过仿真验算,深埋接地极,根据冻土与非冻土下电阻率的变化规律,进行仿真验算,选用接地极数,有效的提高了高寒季节性冻土地区电阻率不稳定情况下接地极埋设的施工效率和降阻效果。

Grounding system is an important protection measure to maintain the safe and reliable operation of traction power supply system,to ensure personal safety and electrical equipment safety.If the grounding resistance value is too large,the grounding body or the grounding network point position is abnormally increased,resulting in the local potential difference of the grounding system itself exceeding the safety value,and it is unable to quickly pull down the potential to protect the operator,causing heavy casualties.In the northeast region of permafrost soil high resistivity area grounding electrode burying construction,through simulation calculation to quickly and effectively reduce the value of grounding resistance and ensure the stability of grounding resistance is the top priority in the construction,which is of great significance to the safe and reliable operation of railway power system and the safety of operators and electrical equipment.The deep buried construction method has achieved good results in the construction process.The layered measurement of resistivity is adopted,and the simulation calculation is carried out according to the variation law of resistivity under frozen soil and non frozen soil.The number of grounding electrodes is selected,which effectively improves the construction efficiency and resistance reduction effect of grounding electrode under the condition of unstable resistivity in Alpine seasonal frozen soil area.