Ice shedding may induce isolated ground wires’ temporary grounding, which can cause electric quantities of direct current (DC) deicing devices to fluctuate. Hence, the disturbance of ice shedding is able to trigger the protective relay frequently and unnecessarily, which adversely affects the deicing process. Due to the randomness of ice shedding, the grounding resistance varies quickly; thus, the disturbance in poles of deicing devices can be detected multiple times in a short time. Moreover, the permanent fault requires steady arc plasma because of the low output voltage and current of deicing devices, which cannot bring out multiple-time disturbances in the poles. This paper proposes the identification of permanent faults and disturbance induced by deicing based on the permutation entropy, which is verified by a large number of simulations.

中文翻译：

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基于置换熵的冬季大规模清洁能源传输的永久断层和除冰干扰识别

冰脱落可能会导致隔离地线临时接地，这会导致直流（DC）除冰装置的电量发生波动。因此，脱落冰的干扰能够频繁且不必要地触发保护继电器，这对除冰过程产生不利影响。由于冰脱落的随机性，接地电阻变化很快；因此，可以在短时间内多次检测到除冰装置极点的干扰。此外，永久性故障需要稳定的电弧等离子体，因为除冰装置的输出电压和电流较低，不能在极点引起多次扰动。本文提出了基于置换熵的除冰引起的永久故障和扰动识别，并通过大量仿真验证。