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    Home»Utilities»Mitigating Ice Accumulation Risks for Power Lines: Solutions for Utilities
    Utilities

    Mitigating Ice Accumulation Risks for Power Lines: Solutions for Utilities

    October 26, 20244 Mins Read


    Types of ice accumulation, related weather conditions and properties

    Precipitation-Based Icing
    Precipitation-based icing occurs when supercooled water droplets from freezing drizzle or freezing rain land on surfaces with temperatures below freezing, such as power lines, structures, or tree limbs. Freezing rain poses a greater threat during light precipitation events that last more than six hours, as these prolonged conditions allow time for ice to form and accumulate. In contrast, heavy precipitation over a short duration often inhibits significant ice buildup due to the faster rate of rainfall.

    Wind speed plays a critical role in the ice accumulation process. Wind speeds of 10 mph or higher lead to greater ice accretion by dispersing surface heat and UV radiation, promoting ice formation. While low wind speeds can still cause ice accumulation, the amount is significantly reduced. Furthermore, the orientation of power lines relative to wind direction affects the shape of ice buildup. In still conditions, ice forms in a teardrop shape, but when wind speeds are high, ice can accumulate in an airfoil shape, which can cause power lines to gallop. This galloping can lead to wires touching, causing faults or even prolonged outages. Additionally, the increased movement of the lines may damage cross-arms and bring power lines to the ground.

    The time of day also impacts ice accumulation. There is typically a marked drop in ice buildup between noon and 6 p.m. due to solar radiation. Therefore, events occurring outside these hours are more likely to result in significant ice formation.

    Wet snow can also cause icing when partially melted snow crystals stick to surfaces and freeze upon contact. If followed by a cold snap, this ice can persist for several days, increasing risks for utilities.
    Precipitation-based icing, the most commonly forecasted and understood type, typically results in a clear glaze of high-density ice. Its accumulation is influenced by factors such as wet-bulb temperature, wind speed, and the rate of precipitation. Given its frequency and predictability, it remains a major concern for utility companies preparing for winter weather impacts.

    In-Cloud Icing 
    In-cloud icing occurs when super-cooled droplets in clouds freeze on contact with transmission lines. This type of icing, common in elevated terrains, often leads to prolonged events with significant ice build-up. It poses a major challenge due to the remote locations of many transmission lines, making repairs difficult.

    Indji Watch provides detailed forecasts for in-cloud icing, which can result in two types of ice: glaze (clear and dense) and rime (frosty and low density). The system issues alerts for these events, allowing operators to preemptively address risks before they escalate.

    Freezing Fog and Mist: A Common but Overlooked Hazard
    Freezing fog and mist, though often resulting in lighter ice accumulation, can still pose significant risks during prolonged events. Ice formation during freezing fog is common in areas with shallow arctic air masses or snow cover, with events lasting more than six hours presenting higher risks of galloping lines and equipment damage.

    Innovative Solutions for Icing Mitigation
    Indji Systems monitoring and alerting solutions for hazardous weather continues to lead the market with innovative solutions and delivers forecasts of icing from freezing rain and freezing fog including the delivery of SMS and email alerts to your staff. For many utilities, icing becomes more serious when combined with high sustained winds or gusts. For this reason Indji Watch has also developed notifications that combine these threats. Utilities can now be alerted up to 72 hours prior to the start of an ice accumulation event that exceeds customized thresholds for ice build-up and high wind speeds. Now utility operators and field response crews have time to prepare, and take steps to mitigate outage risk and increase safety.

    Having a tool that alerts your team to extreme temperatures, ice accumulation and high winds will allow you to be proactive in your decisions to pre-position material or teams in the field, de-energize a line before equipment is damaged or prevent downed lines from posing as a safety risk.

    THE INDJI SYSTEMS COMMITMENT
    Indji Systems is committed to help you improve grid stability while maintaining safety. We have led the way in bringing innovative solutions to the industry for the past ten years and the introduction of in-house icing alerts continues that focus. Contact us to learn more



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