روش جدید تشخیص ضخامت پوشش یخ در خط انتقال هوایی

Overhead transmission lines are always covered by ice in freezing weather. It's difficult to know about the icing condition of the lines because they usually have large area-span. They will be stretched under the combined action of conductor quality, wind force and ice-covering. This paper deduces the relationship of conductor-weight ratio, iceweight ratio, wind-pressure ratio and conductor length, and proposes a novel thickness detection method of ice covering on overhead line. This method uses travelling wave location equipments to collect travelling wave signal which a circuit breaker generates. The signal's arrival time is detected by Hilbert-Huang Transformation. Then the length of the line can be calculated. Finally, the average thickness of ice covering on transmission line would be calculated by using the formula of the relationship between comprehensive conductor load ratio and ice thickness. Simulation results indicate that the method can effectively calculate the average thickness of ice covering on line. It provides important reference for power workers to know about the icing condition promptly.