Pipeline warning tape are widely used in various direct buried gas pipelines, oil pipelines, urban water supply and drainage and other gases, liquid pipeline delivery systems, power cables, communication optical cables, etc. The warning protection of the transmission system, especially the insulating rubber pads for various urban pipe network construction sites, road construction sites, and traffic experiments, and the experimental voltage is applied to the metal plate on the upper part of the insulating rubber pad.

The experimental voltage rises from the lower value, and gradually increases at a speed of 1000V/s until the specified experimental voltage or insulating rubber pad is broken. The experimental time is calculated from the time when the specified experimental voltage is reached. The duration of the electricity industry is 1min. If there is no corona, no flash, no breakdown, no obvious fever, the experiment is passed. During segmented experiments, the edges of the experiments should overlap between segments.