±800kV级直流输电线路对地距离及交叉跨越研究

Research on Clearance to Ground and other Crossed Facilities of DC Transmission Lines at ±800 kV Voltage Level

研究和确定±800kV级直流输电线路对环境的影响标准,包括合成场强、离子流密度、人或物体感应电压、无线电干扰、电视干扰、可听噪声等;由电场强度、电气绝缘强度及其他因素决定对地及交叉跨越距离;根据电磁环境影响等要求,确定线路的走廊宽度。基于电场强度和电气绝缘强度要求并结合中国国情,给出了±800kV级直流工程对地及交叉跨越距离的建议值。

The environment influence standards of DC transmission lines at ＋800 kV voltage level are studied and defined, including composed field intensity, density of ion-flow, faradism voltage on human bodies or objects, radio interference, TV interference, aural noise etc.. The clearances to ground and other crossed facilities are decided by field intensity, insulating strength and other factors, and the width of line corridor is confirmed in accordance with requirements of electromagnetism environment influence. The paper proposes definite values of the clearance to ground and other crossed facilities on the requirments of field intensity and insulating strength as well as the practical situation in China.