From the perspective of the particle size of pollution particles, the particle size characteristics of the insulator surface pollution under two typical dust pollution sources of nickel plants (metal) and chemical plants were tested and analyzed, and the influence mechanism of the pollution particle size on the pollution accumulation was studied by establishing a pollution particle deposition model. The results show that the average particle size of pollution particles on insulator surface in chemical plant area is only 6.67 μm, while the average particle size of pollution particles on insulator surface in nickel plant area attains 24.5 μm. The deposition rate is the largest when the particle size of pollution particles is 20‒30 μm, therefore the surface of insulator in nickel plant area is polluted seriously. The simulation results based on the pollution particle deposition model can confirm with the on-site pollution accumulation phenomena, which explains the influence of pollution particle size on the insulator pollution accumulation.

The main insulation of cross-linked polyethylene (XLPE) HVDC cable was sliced at radial inner, middle, and outer layers to as samples, and their equivalent thermal history was modeled by differential scanning calorimetry (DSC). The changes of chemical and electrical properties of each layer in cable insulation after type test were analyzed by infrared spectroscopy (FTIR), space charge, and DC electrical strength test. The results show that after type test, the equivalent heat treatment temperatures of each layer in cable main insulation are about 70℃, there is a small difference between the equivalent heat treatment time of the middle layer and the outer layer, while the equivalent heat treatment time of the inner layer is about 581 times bigger than that of the middle layer. There are little changes in DC electric strength and chemical properties of each layer in cable main insulation. Due to the equivalent heat treatment time of each layer is different, the impurities, polar small molecules, and other substances in inner insulation layer continue to diffuse from the inner layer to the middle layer, which results in the significant accumulation of heteropolar space charges.

A monitoring method for the operating state characteristics of bushing in UHV converter valve hall was proposed from the perspective of intelligent image processing and three-dimensional modeling technology. This method mainly included using intelligent image processing technology to identify and classify the databases of infrared thermal imager and ultraviolet imager, using Kalman filtering technology to realize on-line measurement in real time for the insulation distance of typical metal fittings, and using three-dimensional modeling technology based on finite element method to build the electric field simulation model of typical main equipment bushing in valve hall, and the electric field distribution on the surface of key metal fittings was obtained. Combined with the image database information, insulation distance information, and electric field distribution information of typical main equipment bushing, its operation state parameters were obtained effectively, and its operation state was evaluated by the intelligent algorithm automatically. The results show that when the Kalman filtering technology is not used, the prediction deviation of the distance at key positions changes severely in 0‒160 s. After using the Kalman filtering technology, the jump amplitude of prediction deviation decreases and is basically controlled at the same error level. The neural network has good learning effect, the fitness function tends to be stable after 100 iterations, and the local weight of fuzzy neural network shows typical nonlinear characteristics. The research conclusion can explore potential hidden dangers and locate positive faults effectively, which provide effective data support and protection strategies for the operation and maintenance of main equipment bushing.

A finite element simulating model of stator bar end was established by COMSOL software, and the influences of electrical properties parameters of insulating material on the electric field and potential distribution of bar end were analyzed. The results show that with the increase of relative permittivity of main insulation, the maximum electric field on stator bar end surface increases, therefore it is better to choose smaller relative permittivity of main insulating material. The resistivity of main insulation material has no significant effect on the maximum electric field on bar end surface. The relative permittivity of each anti corona layer has little effect on the maximum electric field on bar surface. It is better to choose larger nonlinear resistance coefficient of medium resistance anti corona layer. The nonlinear resistance coefficients of medium and high resistance anti corona layer have little effect on the maximum electric field on bar surface, and it is best to choose 1. The nonlinear resistance coefficient of high resistance anti corona layer has no effect on the maximum electric field on bar surface. The influence degree of initial resistivity of different anti corona layers on the maximum electric field of bar surface is different. Through partial correlation analysis, the influence degree of electrical properties parameters of insulating material on the maximum electric field at bar end is ranked, and the initial resistivity and nonlinear resistance coefficient of the medium resistance anti corona layer are the dominant factors.

On the basis of a new type of three-element mixed insulating oil with excellent physichemical and electrical properties, and taking the mineral insulating oil-paper composite system as a reference, the creeping discharge characteristics of the three-element mixed insulating oil-paper composite system were analyzed under needle-plate electrode structure. The electric field distribution of two insulating oil-paper composite systems were simulated under needle-plate electrode structure. On the basis of density functional theory, the energy band structures of natural ester molecule and mineral oil molecule were studied comparatively. The results show that compared with the mineral insulating oil-paper composite system, the three-element mixed insulating oil-paper composite system has smaller partial discharge inception voltage, flashover voltage and larger maximum discharge magnitude, discharge pulse number under creeping discharge fault. There is small difference on electric field distribution between two insulating oil-paper composite systems under needle-plate electrode structure. The energy gap of palm oil molecule and soybean oil molecule in mixed oil are smaller than that of the mineral oil molecule, therefore, the mixed oil molecule is more likely to ionize under strong electric field.

The electric multiple unit roof insulators with different operating years were selected as research objects, and the hydrophobic analysis (contact angle method), Fourier infrared analysis, and scanning electron microscope analysis were conducted on them, respectively. The results show that with the increase of service time, the hydrophobicity of the insulator decreases rapidly, while the decreasing trend slows down year by year, and the hydrophobicity of the top umbrella skirt is generally lower than that of the middle and bottom umbrella skirts, which is consistent with the change trend of Si-CH₃ content in insulator analyzed by FTIR. With the increase of service time, the surface morphology of the insulator changes significantly. The micromorphology of the electric multiple unit roof insulator serviced for 6 years is similar to that of the insulator serviced in 110 kV transmission grid for 15‒19 years, which is one of the important reasons that the hydrophobic ageing speed of electric multiple unit insulator is faster than that of transmission grid insulators.

In order to obtain the influence of orientation angle of two-dimensional microsheet on the growth characteristics of electrical tree in composite dielectrics, on the basis of WZ breakdown model of fractal media, we studied the growth and fractal dimension characteristics of electrical tree under different microsheet orientation angles, growth probability index, and discharge threshold voltage. The change of electric field caused by the change of two-dimensional microsheet orientation angle was analyzed, and the influence mechanism of microsheet on the growth of electrical tree was explained. The results show that when the microsheet is oriented perpendicular to the electric field, the electrical tree has the largest fractal dimension and is most difficult to breakdown. With the decrease of the angle formed by microsheet and electric field direction, both the fractal dimension and breakdown time of electrical tree decrease. With the increase of the growth probability index or threshold voltage, the fractal dimension of electrical tree decreases, and the influence on the electrical tree fractal dimension in microcomposite dielectrics with different orientation angles increases. When the orientation angle of microsheet is perpendicular to the electric field, the electric field distribution is relatively uniform. With the increase of microsheet orientation angle, the electric field concentrates at the both ends of microsheet, and the closer the adjacent microsheet, the more concentration the electric field.

In the application scenarios of natural ester insulating oil, the technology of using natural ester insulating oil to replace mineral insulating oil to prolong the service life of in-service old transformers has attracted extensive attention at home and abroad. During the oil replacing process, the residual mineral insulating oil in transformer will mix with the newly added natural ester insulating oil inevitably. In this study, the natural ester was mixed with mineral insulating oil, and its volume fraction was 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%, respectively. The properties of the mixed oils were studied by accelerated thermal ageing tests at 100℃ for 168 h. The results show that with the increase of natural ester content, the degradation range of breakdown voltage of the aged oil decreases, and the effect of water content on the breakdown voltage of the aged oil decreases, while the acid value increases. When the volume fraction of the natural ester exceeds 30%, the dielectric loss factor of the aged oil is lower than that of the oil before ageing. When the volume fraction of mineral oil is 10%, the ignition point of the mixed oil is only 68.5% of that of natural ester.

In this paper, the current research status of partial discharge (PD) measurement using non-sinusoidal voltage waveforms at home and abroad were summarized, the PD characteristics under non-sinusoidal voltage waveforms such as continuous pulse square-wave voltage, triangular-wave voltage, and trapezoidal-wave voltage were reviewed, especially the effects of voltage rise time, frequency, and duty cycle of square-wave voltage on the PD activity were discussed deeply. Finally, the great significance and existing problems of PD measurements using non-sinusoidal voltage waveforms were discussed. Future development of PD measurements using non-sinusoidal voltage waveforms was proposed, and how to use the non-sinusoidal voltage waveforms to enhance the understanding of discharge physical process and insulation ageing mechanism were prospected.

Compared with mineral insulating oil, natural ester insulating oil has the advantages of high biodegradability, non-toxicity, and strong fire resistance, which has the potential to replace mineral insulating oil in power transformer. A set of lightning impulse discharge characteristics test system including high-speed image acquisition system, test power supply, and electrical signal measurement system was established. The positive and negative lightning impulse discharge characteristics of palm insulating oil and mineral insulating oil were tested, and the stop length, development velocity, and gap breakdown characteristics of the streamer in two oils under positive and negative lightning impulse were compared and analyzed. The results show that under the same applied voltage and polarity, the streamer stop length in palm insulating oil is longer and the streamer development velocity is faster compared with the mineral insulating oil. The contents of vitamin A and vitamin E in palm insulating oil have no effect on the streamer stop length, development velocity, and breakdown voltage. The differences of streamer development characteristics and breakdown characteristics under positive and negative voltages mainly comes from the influence of space charge in insulating oil on the streamer development process.