2 20 kV高压输电线电磁辐射水平及防护距离预测

依据<500 kV超高压送变电工程电磁辐射环境影响评价技术规范>(HJ/T 24-1998)中的预测模式对监测点周围地面1.5 m处工频电场进行了验证性监测,表明实际测定结果与理论计算结果基本吻合.通过对220 kV双回同相、双回逆相和单回线路下地面1.5 m、4.5 m、和7.5 m处工频电场变化趋势分析,预测了220 kV高压输电线产生的电磁辐射水平,以及不同房屋结构的防护距离.提出了220 kV高压输电线电磁辐射的防护措施.

Radiated Em ission Levelfrom the 220 kV High - voltage Transm ission Line and Estimation of Protection D istance

According to "500 kV Ultrahigh voltage To deliver Changes Electricity Project Electromagnetic radiation environmental effect assessment technology standard"(HJ/T 24-1998) the confirmation is performed power frequency electric field on the 1.5 m ground around the monitoring site by the forecast pattern.The result confirmed the same electric field intensity of actually determination and the theoretical calculation.From the variance of power frequency electric field on 1.5 m,4.5 m,and 7.5 m ground of double phase circuit and single phase circuit to find the electromagnetic radiation levels and protection distance of different building frame.The protective measure of 220 kV high-voltage transmission line electromagnetic radiation was introduced.