±800kV直流输电线路电磁环境限值研究

Study on the limits of electromagnetic environment of ±800 kV DC transmission lines

±800kV直流线路的电磁环境限值是确定导线型式和线路结构的重要依据,确定合理的电磁环境限值对保护环境和控制工程造价至关重要。对国际上交直流超/特高压输电线路电磁环境控制指标、有关国家和国际组织的电磁环境标准进行了分析,结合国情,提出了±800kV直流线路电场、离子流密度、磁场、无线电干扰和可听噪声的限值建议;根据电磁环境预测结果和限值,给出了±800kV直流线路的导线结构、极导线最小对地高度和不同极导线高度下的走廊宽度。结果表明:采用建议的限值来控制±800kV直流线路的电磁环境,其电场和离子流密度水平与我国超高压直流线路的相当;无线电干扰在国际上处于中等水平;可听噪声满足国家环境噪声标准。

Electromagnetic environment limits of ±800 kV DC transmission lines are the important basis to determine conductor bundle types and line structure. It is very important to determine reasonable electromagnetic environment limits for protecting environment and controlling construction investment. The electromagnetic environment limits of AC and DC EHV/UHV transmission lines and the electromagnetic environment standards of relevant nations and international organizations were analyzed. Limits of the electric field strength, the ion current density, magnetic field, the radio interference and the audible noise of ±800 kV DC transmission lines in China were suggested. The structure of the conductor bundles, the least conductor height above the ground and the corridor width of ±800 kV DC transmission lines were determined on the basis of the electromagnetic environment limits and the forecast results of electromagnetic environment. The research results indicate that if the electromagnetic environment of ±800 kV DC transmission lines is controlled by the suggested limits, the electric field strength and the ion current density will be at the same level as that of the EHV DC transmission lines in China, the radio interference will be at the mid-level compared with other countries, the audible noise will accord with the national standards.