UHV external insulation technology research project passed the acceptance
May 5, led by the China Electric Power Research Institute led by the State Grid Corporation of science and technology project "EHV Power Transmission Project to deal with complex insulation of key technologies in critical environment" passed the acceptance.
The characteristics of air gap insulation are affected by factors such as voltage polarity, voltage waveform, electrode structure and atmospheric environment, and its characteristics are very complicated. It is one of the key issues to be studied in HV transmission systems. With the large-scale construction of UHV AC and DC transmission projects in our country, the path will inevitably go through complicated meteorological environment areas. The flashover of transmission line insulators under high conductivity fog, The problem of non-uniform rain flashover of the pipe is particularly prominent. The transmission equipment is facing more severe tests. It is urgent to develop the research on the external insulation of the UHV transmission project in response to complex environment.
UHV power transmission project to deal with complex insulation of the external environment of the key technologies for the first time studied the UHV external insulation in the high conductivity of the discharge test under a high conductivity, obtained a long gap in the fog water conductivity of 0.3 ~ 3 Siemens / The flashover characteristic curves of UHV insulator strings under the combined action of high conductivity and fog superimposed fouling were obtained. The icing conditions of wires and insulators under the conditions of 凇 凇 and 凇 凇 were contrasted and analyzed. , The flashover characteristics of middle and repeated ice insulator strings under the contamination degree of B ~ E were obtained, and the corresponding outer insulation differential configuration was put forward. The effects of umbrella, diameter and inner conductor shield on the high-voltage DC bushing stain Lightning voltage influence law, put forward the UHVDC wall bushing creepage distance and umbrella structure design.
The UHVDC wall bushing outer insulation umbrella and creepage distance configuration proposed by the project has been used in the design of the world's first ± 1100 kV UHVDC wall bushing outer insulation designed independently in our country. The research results of the project have greatly enhanced the technical economy of the external insulation in complex environments and provided an important basis for the follow-up UHV power transmission project through the external insulation of the complex environment.
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