| The overhead line is the most important part of the electric power system and the important life engineering structure which can achieve power transmission, regulation and distribution in electric energy systems. Strengthening of the sag analysis and management on overhead line has important significance on the protection of transmission lines safety and economic operation.In this paper, according to the mechanical characteristic of transmission line, sag formulas are derived which can provide a theoretical basis for sag management. Use catenary method and parabola method to calculate the sag, stress and length formula. After the comparison of the results, determine the formula of the selection principles of Sag under different conditions, so as to facilitate calculation of sag in the practical engineering. Under different conditions, overhead line sag should select appropriate methods of observation to reduce the error of sag observed values. Through the development of relevant management, establish the defects and risks machine account, and carry out the infrared temperature measurement and protection line work vigorously. Besides, strengthen the sag analysis and management of transmission line, ensure the wire sag up to specification and to meet the operational requirements, improve the health level of equipment and operational level comprehensively, and improve the line's ability to withstand natural disasters and external damage, reduce the rate of out of gate of the transmission line constantly. After the analysis of the typical experience of dealing with and transforming the cable sag's exceptions in the actual operation in Tangshan area, analyze the results that the analysis and management of sag in practical engineering has an important economic and social significance, has promoted significance to the running professional development of transmission lines in Tangshan area, and has the value of promotion in the transmission running professional. |
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