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Lightning electromagnetic field generated by grounding electrode considering soil ionization

Progress in Natural Science:Materials International 2006年第9期16卷 1002-1006页

作者： ZENG Rong , HE Jinliang, ZHANG Bo and GAO Yanqing (State Key Laboratory of Power Systems, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China) State Key Laboratory of Power Systems Department of Electrical Engineering Tsinghua University Beijing 100084 China

A circuit model with lumped time-variable parameter is proposed to calculate the transient characteristic of grounding electrode under lightning current, which takes into consideration the dynamic and nonlinear effect of soil ionization around the grounding electrode. The ionization phenomena in the soil are simulated by means of time-variable parameters under appropriate conditions. The generated electromagnetic field in the air is analyzed by using electrical dipole theory and image theory when the lightning current flows into the grounding electrode. The influence of soil ionization on the electromagnetic field is investigated.

关键词： electromagnetic field grounding electrode soil ionization transient characteristic.

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Calculating current and temperature fields of HVDC grounding electrodes

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Journal of Modern Power Systems and Clean Energy 2016年第2期4卷 300-307页

作者： Zheren ZHANG Zheng XU Tao XU Department of Electrical Engineering Zhejiang UniversityHangzhou 310027China Zhejiang Electric Power Corporation Research Institute Hangzhou 310014China

Current field calculation based on the resistance network method (RNM) and temperature field calculation based on the finite volume method (FVM) can be used to evaluate the performance of high-voltage direct-current(HVDC) grounding *** main idea of the two methods is to transform an electric and temperature field problems to equivalent circuit problems by dividing the 3D soil space near the grounding electrode into a suitable number of contiguous and non-overlapped *** cell is represented as a central node connecting to the adjacent *** resistance network formed by connecting all the adjacent cells together can be solved to calculate the current *** the same conditions,the results calculated by the RNM are consistent with the result by CDEGS,a widely used software package for current distribution and electromagnetic field *** on the finite volume method,the temperature field results are also calculated using time domain simulation.

关键词： HVDC grounding electrode Current field Temperature field Resistance network method Finite volume method

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An optimized transmission line model of grounding electrodes under lightning currents

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Science China(Technological Sciences) 2013年第2期56卷 335-341页

作者： YANG Lin WU GuangNing CAO XiaoBin School of Electrical Engineering Southwest Jiaotong University Sichuan Power Electrical Research Institute

In this paper, an optimized transmission line model （OTL） for modeling transient behavior of grounding electrodes under lightning currents is presented. The soil ionization effect is considered in OTL, and all electromagnetic couplings between dif- ferent parts of grounding electrode are also considered by selecting the size of segment conductor properly and calculating the mutual coupling parameters between segment conductors accurately. Comparing with the traditional transmission line model, the optimized model can be used to accurately predict the effective length and transient potential rise （TPR） of grounding elec- trodes. Transient behaviors of grounding electrodes are simulated by OTL and the results are in good agreement with those of the electromagnetic model proposed by Grcev, and experiment results performed by Electricit6 de France and Geri. Further- more, non-uniform discharging phenomenon of grounding electrode under lightning current is discussed, and the effective lengths of horizontal grounding electrode under lightning currents are presented.

关键词： grounding electrode lightning current transmission line model electromagnetic mutual coupling

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Enhancement of Soil Discharge Channels on Potential Surrounding Buried Cables Under Impulsive Currents

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CSEE Journal of Power and Energy Systems 2022年第6期8卷 1794-1803页

作者： Wenxia Sima Xiaochuan Li Tao Yuan Ming Yang Donghui Luo Jialun Li State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqing400044China State Grid Sichuan Electric Power Research Institute ChengduSichuan610041China

Substations have a large number of signal transmission cables beneath the *** the insulation safety and signal reliability of the cables are affected severely by the electromagnetic *** high-amplitude impulsive currents,the dispersion of currents can cause soil discharge and thus cause unexpected distortions in an electromagnetic *** paper focuses on the distortions of the electric *** general,soil discharge channels occur in the vicinity of the independent *** development of the channel might enhance the electric field distribution and the potential surrounding the outer insulation of the cables(*** surface potential on the cable).Therefore,this paper establishes a platform for observing the soil discharge channel and measuring the surface *** characteristic of the channel is extracted from the captured image of soil discharge channels and the surface potential is obtained by the measured coupling capacitive current on the shield *** paper also presents an improved model considering a dynamic growing discharge channel for the transient analysis of the grounding *** results show the surface potential increases as the discharge channel approaches the *** quantify this enhancement effect,the ratio of the highest to the lowest value of surface potential in different directions is taken as the multiple of the surface potential *** calculated multiples of the surface potential increase are in the range of 1 to 1.64 times under different conditions by the improved ***,taking the soil discharge channel into account is helpful to accurately analyze the impulsive interference of buried cables.

关键词： Coupling current grounding electrode impulsive current local potential distribution soil discharge channel

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