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采用GEM-Ⅲ阵列型大地电磁测深仪,对带电运行中的长哈50万伏超高压输电线路产生的电磁场,在垂直走向半径5km空间域内进行分频测试。对实测结果通过微机处理,在时域、频域、极化方向和调幅波研究的基础上,给出了超高压线电磁干扰场的空间分布、频率特性及衰减规律,并建立了超高压线电磁场二维理论模型,确定了超高压线对地震台及其他设施电磁观测的影响半径,为超高压输电网设计和现行地震观测规范的制定提供依据。
Using GEM-Ⅲ array electromagnetic depth sounder, the electromagnetic field generated by the 500,000-volt EHV transmission line in Changha during live operation was divided and tested in the vertical radius of 5km. On the basis of the research on time domain, frequency domain, polarization direction and amplitude modulation wave, the spatial distribution, frequency characteristics and attenuation law of electromagnetic interference field of UHV power line are given through the computer processing. Dimensional model to determine the radius of influence of UHV transmission line on the electromagnetic observation of the seismic station and other facilities and provide the basis for the design of the UHV transmission network and the formulation of the current seismic observation specifications.