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为了研究特高压直流传输线下的电磁环境,研制了1种无线电场测量系统。为了检测电场测量仪的电磁兼容性能,在30台样机上进行了试验。分析了电场测量仪电磁兼容性能检测的测试结果,并结合电场测量仪的工作环境和干扰途径对电场测量仪电磁兼容中易受干扰的环节进行了相应的改进。研究结果表明:电磁兼容试验项目中故障率最高的为射频电磁场辐射抗扰度试验和浪涌抗扰度试验,通过增加设备内部铜片的厚度,在设备电源端口增加瞬态抑制二极管和滤波器,可有效抑制电磁辐射和浪涌骚扰所产生的电磁干扰。
In order to study the electromagnetic environment under the UHV DC transmission line, a radio field measurement system was developed. In order to test the electromagnetic compatibility of the electric field measuring instrument, the experiment was carried out on 30 prototypes. The test results of the electromagnetic compatibility test of the electric field measuring instrument are analyzed. Combining with the working environment and the interference way of the electric field measuring instrument, the perturbations of the electromagnetic compatibility of the electric field measuring instrument are improved correspondingly. The results show that the highest failure rate of electromagnetic compatibility test project is the radiation immunity test and the surge immunity test of RF electromagnetic field. By increasing the thickness of copper inside the equipment, adding transient suppression diodes and filters , Can effectively suppress the electromagnetic interference generated by electromagnetic radiation and surge disturbance.