《Table 1 Sealing Performances of the End-fittings》

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《Fiber Bragg grating monitors for thermal and stress of the composite insulators in transmission lines》

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The results of the sealing performances are shown in Table 1.The experimental data show that the possibility of the sealing defects in the end-fittings has positive relationship with the running time of insulators，and the defect possibility is about 100%with the running time above 8 a；the defect possibility of the socket（high voltage part，which is shown in Fig.1）is higher than that of the ball（low voltage part，which is shown in Fig.1）；take the insulator samples with the running time above 8 a as an example，the defect possibility of the socket is 93.9%，and the defect possibility of the ball is 78.8%；high voltage part of end-fittings is vulnerable to electric field，which is the cause of the high defect probability.