At present, the rod-shaped suspension composite insulator on the high-voltage line mainly bears the mechanical tensile force of the wire in addition to the insulation. Whether the composite insulator has good tensile strength during operation and whether it can work reliably in long-term operation has always been a concern of the power sector. The power sector's testing of the composite insulators in operation is based on the National Guidance Center Network Regulation (1997) No. 93, "Guiding Opinions on the Use of Synthetic Insulators" (hereinafter referred to as the "Opinions"). The 31 rod-shaped suspension composite insulators put into operation in the power grid from 1991 to 1996 were tested. In the 1min tolerance test of rated mechanical load, it was found that the composite insulator had large defects and could not meet the requirements of the test in the "Opinions". The requirements of the results.
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