Abnormal Heat Causes And Control Measures Of500Kv Lingshen Overhead Transmission Line Composite Insulators

Since2005the Guangdong power grid of large area pollution flashover since, in order todeal with the pollution flashover and reduce maintenance engineering, Guangdong power gridand the national grid of large area uses a composite insulator. Composite insulator because ofits pollution flashover performance is good, light weight, not easy to damage and otheradvantages is widely used in power transmission line. Generally speaking, the goodperformance of composite insulators.But since1998, has been discovered in China for the first time this kind of insulatorrupture accident in Shanghai in August, to2011, has been in Shanghai, Zhejiang, Shandong,Guangdong, Guangxi and other places has appeared11times this kind of accident, thecumulative fault insulator13. Ten twenty-five on November23,2011, Shenzhen PowerSupply Bureau under the jurisdiction of the500kV Lingshen overhead transmission line’sN21tower A phase double string composite insulator fractured, the line as a nuclear powerstation outlet important power circuit, ensure its safe running is particularly important. Thiskind of insulator rupture emergency defects the damage characteristics and fault parameterswith known insulator brittle fracture accident have obvious difference. Therefore, researchingon the failure mechanism of this new type of composite insulators for perfecting the theorysystem of defects in composite insulators has important significance. According to the failuremechanism, puts forward the control measures, improving the production process ofcomposite insulators, to avoid similar accidents, ensure the safety and stability of powersupply.