Ice Sensor Systems: Early Warning and Prevention of Transmission Line Icing Disasters

Transmission line icing is a severe natural disaster that power systems face during cold seasons, particularly when encountering freezing rain, sleet, or freezing fog conditions. When the ambient temperature drops below zero degrees Celsius, supercooled water droplets, freezing rain, or snowflakes in the atmosphere collide with transmission line facilities below the freezing point, they rapidly freeze and adhere to the surfaces of conductors, ground wires, insulators, and tower fittings, forming a dense and strongly adhesive ice layer. If this process continues to develop, the ice layer will thicken continuously, eventually forming a severe icing phenomenon.

The hazards of icing to transmission lines are multifaceted. First, the weight of the ice layer itself significantly increases the mechanical load on conductors and towers, causing a substantial decrease in conductor sag, which may result in insufficient safety distances to trees and buildings below, triggering discharges. Second, under wind action, conductors with asynchronous de-icing or uneven icing are prone to galloping—this low-frequency, large-amplitude oscillation can wear conductors, damage hardware, and even cause phase-to-phase short circuits or line tripping. In the most severe cases, excessively thick ice may directly exceed the design mechanical strength limit of the line, triggering catastrophic accidents such as conductor breakage and tower collapse, resulting in large-scale and prolonged power outages that bring enormous impacts to social economy and people's lives.

To proactively defend against icing disasters and ensure grid safety, real-time and accurate monitoring of line icing conditions has become a fundamental and critical technical measure. Ice sensors are specialized devices designed for this purpose. They are directly installed on transmission lines in field locations and can continuously perceive changes in the surrounding atmospheric conditions and the physical state of their own surfaces.

For example, the FT-JB1H Ice Sensor can detect the exact moment when icing begins to form. It directly contacts the external environment through its sensing elements, and once it detects the start of ice formation, it immediately converts this physical state change into a standard electrical signal. This signal is then transmitted through an integrated communication module via wired or wireless transmission networks, sending the critical status information that "the line has started to ice," along with an accurate timestamp, to remote power dispatching or monitoring centers in real-time.

The value of this information lies in its timeliness and directness. It enables operation and maintenance personnel to receive alerts at the earliest stage of icing development, thereby gaining valuable time for subsequent decision-making and actions. Based on the on-site first-hand data provided by the Ice Sensor, the grid control center can scientifically activate DC de-icing devices, adjust grid operation modes to transfer loads, or promptly organize inspection and emergency de-icing teams, achieving a transformation from passive response to active warning and precise intervention.