Development and Application of Six-splitting LIU XXX, WANG XX Live Working CXXXXn of Hunan I. INTRODUCTION Live working is an important technical to ensure the safe and stable operation of UHV transmission lines. The development of light weight, high mechanical strength, flexible operation and reasonable structure equipments to reduce the labor intensity and ensure the safety of workers is of great significance. Six-splitting wire hook is one of the important components of the tools to charge replace the insulator string. Carbon fiber is a high performance fiber with small density, stable chemical property and excellent mechanical properties and it is very important to explore the application of carbon fiber reinforced resin matrix composite in the development of the six-splitting wire hook. II. THE DESIGNATION The structure of the six-splitting wire hook (Fig.1) is designed according to the structure of the six-split wire. M40J Carbon fiber prepreg is selected as the production material. 3.2 Mechanical simulation of the main body The results of the stress calculation, complex displacement and strain are shown in Fig. 3: the minimum stress is 1.92952×108Pa; and the maximum stress is 1.92952Pa, the minimum displacement is 0 mm, the maximum displacement is 0.51 mm, the minimum strain is 1.79×10-8, the maximum strain is 6.2×10-4. Fig.3 Mechanical simulation of the main hook (a) Grid partition graph (b) stress diagram (c) shift diagram (d) strain diagram IV. MOULDING PROCESS Firstly, the carbon fiber prepreg is cut in accordance with the set size. Secondly, put the tailored prepreg material into the warm room to soften and align 4 pieces of prepreg according to the set directions; thirdly, a certain amount of pieces of pre compounded materials are overlay to the corresponding shape of the hook. Forth, the finished work pieces is put into the mold cavity, and solidify it under a certain condition. Finally, the polishing and finishing of the products should be carried out. The product of the six-splitting wire hook made of CFRP is shown in Fig. 4 Fig. 1 the structure of the six-splitting wire hook (a) main body, (b) the auxiliary hook III. MECHANICAL PROPERTY SIMULATION 3.1. load calculation of the insulator strings for UHV transmission lines The calculation formula for insulator string in 800kV extra high voltage transmission line is as following: The load of insulator string is about 8 tons according to the combination of the calculation by bringing the relevant parameters into the formula (1) and the practical engineering application experience. Thus the nominal load of the six-splitting wire hook is 8 tons. 3.2 Mechanical simulation of the auxiliary hook The simulation results of the static stress of the auxiliary hook are shown Fig. 2: the minimum stress of the auxiliary hook is 14390.5Pa, Maximum stress is 5.55×108Pa. The minimum displacement is 0mm, the maximum displacement is 5.63mm, the minimum strain is 2.31×10-8, the maximum strain is 1.52×10-3. （1） Fig.4 Mechanical simulation of the main hook (a) Grid partition graph (b) stress diagram (c) shift diagram (d) strain diagram V. CONCLUSION (1) The mechanical calibration of the six-splitting wire hook are carried out based on 3D modeling and mechanical properties of simulating test of SolidWorks, including stress, displacement and strain. The application of solidworks improves the design efficiency, shortens the production cycle and reduces the cost of research and development of the hook. (2) The six-splitting wire hook made of M40J-6K carbon fiber prepreg greatly reduces the labor intensity of the workers on the tower, and improves the efficiency of the operation and the safety factor of the workers. This work opens the era of carbon fiber composite materials in the application of live working of UHV transmission line. Fig. 2 Mechanical simulation of the auxiliary hook (a) Grid partition graph (b) stress diagram (c) shift diagram (d) strain diagram Tel: E-Mail cp0038