7results about How to "Improve insulation stability" patented technology

The invention belongs to the technical field of direct-current high-voltage GIS insulation, and relates to a basin-type insulator of a high-voltage direct-current GIS / GIL and an optimization method, system and device of the basin-type insulator. Modeling the insulator structure to obtain an insulator structure model, modeling the shielding case to obtain a shielding case structure model, and establishing a multi-physics field coupling model according to the physics field boundary condition and the initial value of the basin-type insulator under the actual working condition in combination with the GIS insulation structure two-dimensional axisymmetric model; and substituting the insulator structure model and the shielding case structure model into a multi-physics field coupling model to solve surface charge distribution and electric field distribution of the basin-type insulator, and selecting an optimal basin-type insulator structure according to the surface charge distribution and electric field distribution of the basin-type insulator. The structure of the basin-type insulator can be optimized, the optimized structure of the basin-type insulator can relieve concentration of local electric stress under the working condition of high-voltage direct current, long-term insulation is guaranteed, reliability of long-term insulation is improved, and safe and stable operation of a direct-current GIS is guaranteed.

The utility model relates to the technical field of Raschig rings, in particular to a high-strength low-resistance Raschig ring. The high-strength low-resistance Raschig ring comprises a Raschig ring body and a reinforcing ring, high-strength coating is sprayed on the outer side wall and the inner side wall of the Raschig ring body, adhesive is sprayed on the surface of the high-strength coating sprayed on the inner side wall of the Raschig ring body, and low-resistance coating is sprayed on the surface of the adhesive. The transverse compressive strength of the Raschig ring can be improved through the reinforcing rings, the longitudinal compressive strength of the Raschig ring can be improved through the reinforcing ribs, meanwhile, the high-performance powder coating has the advantages of being high in coating compactness, low in void ratio, high in coating strength and good in water resistance and chemical resistance, and therefore the strength of the Raschig ring can be further improved; the Teflon coating has the advantages of heat resistance, chemical inertness, excellent insulation stability and low friction, so that the flowing resistance of liquid on the inner wall of the Raschig ring can be effectively reduced, and the Raschig ring has the characteristic of low resistance.

The utility model discloses a high-temperature-resistant shell structure for a SiC power device, which comprises a plastic frame, and three AC power terminals are fixed at the bottom of the plastic frame through integral injection molding. According to the utility model, the plastic frame, the DC1 power terminal, the DC2 power terminal and the AC power terminal are subjected to integrated injection molding, so that the phenomena of independent assembly and terminal plugging hole position reservation are avoided, and a better integrated stable effect is achieved; the insulating layer prefabricated member made of PPA, PPS or insulating ceramic materials is clamped, positioned, separated and insulated between the DC1 power terminal and the DC2 power terminal in advance, the high temperature resistance and the insulating property are both superior to those of a traditional PBT plastic single material, the junction temperature of the SiC power device can be remarkably increased, the electric leakage risk caused by aging of the insulating layer between the DC1 power terminal and the DC2 power terminal is reduced, and the service life of the SiC power device is prolonged. The insulation stability between the two is improved, and the requirements of long-term high-temperature-resistant service in different application scenes are met.

This invention belongs to the field of protective coating technology and discloses an environmentally friendly ceramic-graphene composite insulating protective coating and its preparation method. The coating comprises an aqueous epoxy resin, an inorganic ceramic precursor film-forming component, a core-shell-interface modified insulating graphene functional filler, an aqueous curing agent, and additives. The functional filler includes a graphene core, an Al2O3 insulating shell continuously coated on its surface, and an epoxy reactive organosilicon interface layer grafted onto the outer surface of the Al2O3 insulating shell. By first preparing the functional filler and then compounding it with the aqueous epoxy resin and the inorganic ceramic precursor film-forming component to form a film, the resulting coating possesses excellent insulation, protection, and adhesion stability, making it suitable for insulating and protecting metal substrate surfaces.

The present application relates to the technical field of wireless power transmission, and particularly relates to a coil arrangement design method and system of a multi-relay wireless power transmission structure, steps as follows: determining the transmission distance according to the voltage level; under the constraint of the transmission distance, introducing the arrangement ratio to represent the ratio of the second interval between adjacent groups in the non-equidistant grouping arrangement and the first interval between the coils in the same group, and establishing a geometric parameterized model of the non-equidistant arrangement; constructing the coupling impedance matrix based on the mutual inductance theory, and deducing the system energy transmission efficiency model; for different candidate values of the coil series, on the basis of the given coil parameters, the efficiency distribution curve of the system efficiency changing with the arrangement ratio is obtained by adjusting the arrangement ratio; based on the efficiency distribution curve, the optimal coil series and the corresponding optimal arrangement ratio that make the system energy transmission efficiency optimal are determined, and the optimal design scheme of the coil arrangement design is obtained. The present application can effectively improve the stability of system operation, the reliability of coil interface combination and the overall insulation stability.

The invention provides an epoxy resin performance evaluation method based on an energy factor, which is characterized in that an epoxy resin reliability test platform based on a breakdown energy factor is established, and the evaluation steps are as follows: placing a sample made of epoxy resin in an experimental device memory; adjusting the output voltage of the electric energy excitation control terminal through the upper computer, continuously increasing the applied voltage until the voltage detector detects that the voltage at the two ends of the epoxy resin sample is zero, feeding back the current of the circuit and the voltage values at the two ends of the epoxy resin sample during breakdown, and calculating to obtain the theoretical value of the energy used by the epoxy resin sample. The method comprises the following steps: modeling an energy factor value formula by adopting a particle swarm optimization algorithm, calculating an error coefficient which minimizes an error, calculating to obtain an optimized energy factor value, calculating to obtain a reliability evaluation factor of the epoxy resin through the energy factor, and evaluating the reliability of the epoxy resin. The invention aims to provide an epoxy resin performance evaluation method based on an energy factor, and reference is provided for safe and stable operation of a power system.