3results about How to "Improve electrical resistance" patented technology

The application discloses a kind of high surface natural micropore structure regulation-based high surface withstand voltage polyimide and preparation method and application thereof, belong to high voltage insulating material technical field, after drying diamine is dissolved in solvent A, then add dianhydride, after stirring uniformly, obtain polyamide acid solution;Add pore forming agent again, high-speed stirring is uniformly dispersed, obtain mixed viscous solution C;After coating, drying, imidization high temperature heating, and natural cooling, immerse in liquid B and extract pore forming agent, after drying, obtain high surface natural micropore structure regulation-based high surface withstand voltage polyimide.The polyimide surface has natural pore structure, surface is along the surface of electric field, and the through-hole structure is densely distributed along the surface of electric field, and the electron is easy to drop into the through-hole structure in the jumping multiplication process when flashover, and it is difficult to return to the surface, so that the secondary electron multiplication process is inhibited, the probability of forming secondary electron avalanche is reduced, so as to realize the improvement of surface withstand voltage.

The invention relates to the technical field of electronic control devices, in particular to a contact part and a relay. The contact part is provided with at least two parallel branches which are arranged in the same current path in parallel, each parallel branch is provided with a contact group, and each contact group comprises a movable contact and a static contact; at least two of the parallel branches form an alternating group; in the alternating groups, the movable contact and / or the static contact of each contact group comprises at least two electric contact layers, and each electric contact layer is arranged along the height direction of the corresponding movable contact or static contact.

The invention relates to an ethylene propylene rubber insulated mining energy storage cable and a preparation method thereof, and relates to the technical field of wire and cable manufacturing, the cable comprises a cable core, a wrapping tape and a sheath, the cable core is formed by twisting a direct current cable core, a control cable core and a temperature sensing optical cable; the direct-current insulating layer is prepared from ethylene propylene rubber, modified calcined clay, nano magnesium hydroxide, superfine aluminum hydroxide, an assistant crosslinker and other raw materials, and the water tree resistance is improved through the synergistic effect of lamellar filler and a cross-linked network; the temperature sensing optical cable is filled with thixotropic buffer paste containing molybdenum disulfide, dynamic reverse pre-twisting is applied during cabling, the pay-off tension is controlled to be smaller than 75% of a direct-current cable core, and physical excess length is given to the optical fiber structure; and the sheath is made of a low-smoke halogen-free flame-retardant material formed by blending EVA and POE. The problems of insulation aging and optical fiber breakage of the mining cable in a humid vibration environment are solved, and the electrical insulating property, the mechanical flexibility and the state monitoring reliability of the cable are improved.