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The current methods for evaluating the operating condition of electricity transmission lines (ETLs) and providing early warning have several problems, such as the low correlation of data, ignoring the influence of seasonal factors, and strong subjectivity. This paper analyses the sensitive factors that influence dynamic key evaluation indices such as grounding resistance, sag, and wire corrosion, establishes the evaluation criteria of the ETL operation state, and proposes five ETL status levels and seven principles for selecting evaluation indices. Nine grade I evaluation indices and twenty-nine grade II evaluation indices, including passageway and meteorological environments, are determined. The cloud model theory is embedded and used to propose a warning technology for the operation state of ETLs based on inspection defect parameters and the cloud model. Combined with the inspection defect parameters of a line in the Baicheng district of Jilin Province and the critical evaluation index data such as grounding resistance, sag, and wire corrosion, which are used to calculate the timeliness of the data, the solid line is evaluated. The research shows that the dynamic evaluation model is correct and that the ETL status evaluation and early warning method have reasonable practicability. [ABSTRACT FROM AUTHOR]

To understand anti-democratic barriers to accomplishing energy democracy, I examine how and why a centralised energy system can maintain itself based on an ethnographic analysis of the local protest of the Miryang community against the Korea Electric Power Corporation's construction of a 765,000-volt transmission line. In doing so, I incorporate the element of authoritarian communication into the framework of peripheralization – a socio-political reproduction of social, spatial, and environmental inequality caused by siting environmentally hazardous facilities in peripheral communities and reinforcing their powerlessness – to emphasize the aggressive role of government and industry actors. Composed of unidirectional projection, partial absorption, and forceful suppression, authoritarian communication makes the sacrifices of peripheral communities enduring, and consequently enables an undemocratic energy arrangement to be resilient and perpetual. To overcome this mechanism, I highlight the active roles of citizens to contest authoritarian communication and socio-environmental inequalities as a precondition to building a sustainable energy democracy. [ABSTRACT FROM AUTHOR]

Aiming at the problem of off‐line deicing in overhead transmission lines, such as poor continuity of power supply and possible damage of lines caused by over‐thick deicing, a new online anti‐icing and deicing method based on external excitation resonance is proposed. The theoretical basis of the external excitation resonance to anti‐icing and deicing is established. Then the modal characteristics of the external excitation resonance are determined through the modal analysis of the ice‐coated transmission lines, and the reasonable frequency range of the external excitation resonance is obtained. According to the theoretical analysis and calculation results, the anti‐icing and deicing robot system is designed by the external excitation resonance. Intelligent video technology is used to detect the icing condition of transmission lines in real time, and the vibration frequency range of transmission lines is analyzed and calculated. The vibration frequency is adjusted through the real‐time tracking of the resonance feedback mechanism to ensure the continuity of the resonance working state, so as to effectively realize the efficient anti‐icing and deicing of the transmission lines with the thickness of 1–3 mm at the initial icing stage. Finally, the parameters of the key components of the system are calculated and determined, and the related influencing factors are analyzed. A new deicing theory based on anti‐icing theory is proposed, and specific engineering measures are given. © 2020 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. [ABSTRACT FROM AUTHOR]

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To facilitate scientific decision-making and geohazard prevention and mitigation during the construction and operation of an electricity transmission line projects in Tibet, China, this paper used remote sensing (RS) and geographic information system (GIS) technologies to semi-automatically extract potential geohazards along this line which pose threats to the transmission towers from the perspective of drainage basin, especially for the high-speed and long run-out geohazards, such as glacial landslides and debris flows (triggered by glacial lake burst and rainstorm). Spatial analysis tools are used to model the relationships among different geohazards and towers, according to the development and movement laws of each kind of geological disasters and position information of the towers. Using the proposed extraction model, 37 geohazards posing direct threats to 93 towers were automatically filtered. These were corroborated by field investigations and should be monitored during the following construction and line operation stage. The results show that the proposed model based on spatial analysis can quickly filter and locate geohazards and the corresponding towers, especially for the hazards with a long distance to the transmission towers, and effectively reduce the workload of field investigation. [ABSTRACT FROM AUTHOR]