本文件旨在提供交流（AC）和直流（DC）并联架空输电线路走廊测量点布置原则、测量方法、测量数据分析和测量结果评估的推荐实施规程，为输电线路电磁环境监测、工程设计和设备选型提供指导。本文件适用于测量交直流并联输电线路下接头区域的电磁环境，最大距离不超过100m，交流输电线路不低于100kV，直流输电线路不低于400kV。

This document provides a recommended practice for the arrangement principle of measurement points, the method of measurement, the analysis of measurement data, and the evaluation of measurement results for the corridor of overhead power transmission lines in parallel mixed with alternating current (ac) and direct current (dc), which can provide guidance for monitoring electromagnetic environmental of power transmission lines, as well as engineering design and equipment selection. This document is applicable to measure the electromagnetic environment of the joint region under the ac and dc parallel transmission lines, whose maximum distance shall not exceed 100 m, the voltage shall not be less than 100 kV for ac transmission line and ±400 kV for dc transmission line.