大地电流

1956年1月9日至14日在中国的北京和匈牙利的索坡伦两处同时观测大地电流的结果

Results of the simultaneous measurements of telluric currents between peking ( china ) and sopron ( hungary ) executed from 9th to 14th January 1956

地球物理探矿研究中的新发展：大地电流

Development in the newest geophysical research method : the telluric

地震勘探提供的地质图件与大地电流的结果完全不相同。

Seismic surveys gave a geologic picture quite different from that indicated by the telluric current .

算法应用黑箱理论，将复杂的大地电流场计算变换为电路计算，将电场-电路交替问题演化成纯电路问题，使分析简化。

Using black-box theory , the algorithm converts complicated earth current field computation into circuit computation , changing the field-circuit alternation problem into pure circuit matter , thus greatly simplifying the analysis .

同时，提出了交流接地极源极与受极的概念，有助于从理论及工程应用层面分析直流大地电流对交流电网的影响。

Meanwhile , the concepts of source and receiving AC earth electrodes are presented , which facilitates the analysis of the effects of DC ground current on AC power grid from the perspectives of theory and engineering application .

大地微电流在这2次地震前具有明显的异常变化，其异常幅度达正常背景值的10~20倍。

The anomalous variations of micro-current before this two earthquakes are obvious . The anomalous amplitude is 10 ~ 20 times higher than that of ordinary background .

由直流动力运输系统产生的大地漏泄电流会造成地铁设施或附近公用设施管线和其它埋地结构物的腐蚀。

The leakage current incurred by DC powered transportation systems may cause corrosion of facilities in the metro system as well as corrosion of underground utility pipelines and other buried structures .

近几十年来，大地电场（电流）观测方法和地震预报的实践，证实地下电场磁场临震前兆是存在的。

It has been confirmed that the earthquake precursors of underground electromagnetic field are existent through the underground electronic field / current observation method and the practice of earthquake forecast for several decades .

直流输电系统单极大地运行时，土壤和交流电力系统构成一个大范围的直流通路网络，从大地返回的电流流过变压器中性点将使变压器出现直流偏磁，影响变压器的正常运行。

During monopolar operation of HVDC systems with ground return , there is a large scale DC route between soil and AC power net and currents returned from earth may enter into neutrals of transformers , which cause DC bias of transformers and influence transformers running .