In this paper, C5F10O (perfluorpentone, C5 for short) is decomposed in GIS/GIL due to the existence of insulation defects. C5F10O will produce typical decomposition gases such as CO, C3F6, CO2, C3F8, C2F6, C2F4 and CF4 under overheating conditions. The concentration of the above gases under the overheating conditions is a strong correlation series of time. It is necessary to carry out high-precision fitting for the time series obtained from the above tests. First, Gauss Chebyshev process is used to reconstruct the background value, which realizes high-precision fitting and prediction and early warning of two-dimensional nonlinear time series. At the same time, the maximum likelihood estimation of three-dimensional curved surface combined prediction model is realized. This paper first analyzes orthogonal prediction model based on the grey Markov chain Gauss Chebyshev from the mathematical model level, then analyzes the decomposition characteristics of C5F10O/CO2 under local overheating conditions and its prediction technology, and obtains the optimal ratio of new environment-friendly gas insulation, which has good guiding significance for the application of the new insulation gas to the operation, the maintenance and repair technology of the high-voltage electrical equipment.
In this paper, based on the discussion of the multi-layer composite insulation structure and interface in the dry glue impregnated paper sleeve, the expressions of interface charge and field strength in the double-layer composite medium are deduced by using Maxwell equation and corresponding boundary conditions. The three-layer composite medium is discussed by expanding the formula system. The theoretical calculation results show that there is interaction between three-layer composite media, and the distortion of space charge and electric field is much larger than that in double-layer composite media. Further, the allowable field strength of the outgoing line device at the tail of the converter transformer under various operating conditions is analyzed, the finite element simulation calculation model of the typical outgoing line structure is established, the transient potential and electric field distribution characteristics of the outgoing line device are discussed under various voltage types such as polarity reversal, and the insulation margin value of the critical path is obtained by combining the allowable field strength. The allowable field strength and insulation structure design of outgoing line device are proposed, which can provide reference for the design of outgoing line structure of converter transformer.
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