3results about How to "High breakdown field strength" patented technology

The application relates to the technical field of cable materials, in particular to an insulating cable material and a preparation method thereof. A large number of'sea-island' interface structures exist in a PP / SEBS blended material body, and charges generated by electrode injection and polarization are prone to accumulating at the'sea-island' interface, so that space charge accumulation is caused, and the voltage breakdown field strength of the material is reduced. Based on the above problems, the application provides an insulating cable material, wherein long-carbon-chain modified graphene is added in the material system; the long carbon chain makes the nano-graphene sheet layer structure not prone to agglomeration; the long carbon chain can also act as a 'bridge' to accelerate the migration speed of carriers in SEBS in all directions, so that the difference between the number of carriers reaching and leaving the'sea-island' interface in the polarization process of the PP / SEBS blended material is reduced, and the space charge accumulation phenomenon at the interface is effectively improved.

The application provides a high-frequency transformer functional insulating material of plasmonic orientation boron nitride and a preparation method and application thereof, and relates to the technical field of insulating materials. The functional insulating material is obtained by sequentially covering, from an inner layer to an outer layer, a thermosetting resin matrix layer, a silicon-rich transition layer, an oriented boron nitride sheet layer, a boron nitride gradient insulating layer and a densified surface layer on the surface of a metal conductor. The insulating material can realize heat diffusion enhancement, electric field distribution homogenization and space charge inhibition, and exhibits high breakdown strength, high local discharge starting voltage and good long-term insulating stability under high-frequency non-sinusoidal voltage, and is suitable for insulating reinforcement of the winding end, the outgoing line end and the core clamping piece area of a high-frequency transformer of a super-speed train, and has a good application prospect.

This invention discloses a cross-linked polyethylene insulation material for medium-voltage DC cables and its preparation method. By weight, it comprises the following raw materials: 100-110 parts LDPE, 5-8 parts modified filler, 0.4-0.6 parts antioxidant, 0.2-0.3 parts cross-linking aid, and 0.4-0.7 parts initiator. The modified filler, prepared by a specific method, combined with an optimized cross-linking and antioxidant system, significantly improves the overall performance of the insulation material. This modified filler, through the synergistic effect of its deep trap energy levels in the core and the shallow trap energy levels of the outer organic molecules, increases the DC resistivity and breakdown field strength of the material. Simultaneously, the flexible long-chain structure grafted onto the filler surface improves its interfacial compatibility with the polyethylene matrix, giving the material excellent mechanical properties that meet the stringent requirements for long-term safe and stable operation of medium-voltage DC cables.