transmission line leakage current is the small, undesirable flow of electrical current that travels along the surface of insulators and other components of a high-voltage line, bypassing the intended path of the conductor. This current does not contribute to power delivery and represents a loss of energy.

The primary cause of leakage current is the accumulation of surface contaminants on insulators, such as dust, salt, and industrial pollution. In wet conditions (rain, fog), this pollution becomes conductive, creating a pathway for current to "leak" from the conductor to the ground or tower. This can lead to a phenomenon known as a "dry band," where localized arcing can intensify, potentially causing an insulator flashover.

To prevent leakage current and the associated power losses and faults, it is critical to use high-quality transmission line tools and equipment for proper insulator installation and maintenance. Regular inspection and cleaning of insulators, especially in areas with high pollution, are essential. At Ningbo Changshi, our advanced overhead transmission line equipment ensures the precise installation and maintenance of insulators to minimize contamination points and prevent these currents from occurring.