Ceramic insulating material for transformer and firing method of ceramic insulating material

Abstract

The invention discloses a ceramic insulating material for a transformer and a firing method of the ceramic insulating material. The ceramic insulating material is formed by firing a base material, a filling material and a pore forming agent; the base material consists of sintered kaolin, magnesite powder, quartz sand and sericite; the filling material consists of monatomic silicon powder, active alumina micro powder, modified nano-silicon dioxide and modified sepiolite fabric powder; the pore forming agent consists of fine silicon carbide powder, fine kyanite powder and vermiculite powder. The materials of the ceramic insulating material for the transformer contain certain open type air holes (or opening air holes), but the strength of the ceramic insulating material for the transformer cannot be affected; the open type air holes shrink obviously by adding the kyanite powder of which the volume is expanded at a high temperature, so that fine air holes are formed in the interior of the surface of ceramics; therefore, the bonding of the fired insulating material and other insulting materials, such as plastics and rubber, is facilitated.

Description

technical field [0001] The invention relates to a transformer in a power system, in particular to a ceramic insulating material for a transformer and a firing method thereof. Background technique [0002] Transformer is a device that uses the principle of electromagnetic induction to change AC voltage. The main components are primary coil, secondary coil and iron core (magnetic core). The main functions are: voltage conversion, current conversion, impedance conversion, isolation, voltage stabilization (magnetic saturation transformer), etc. The capacitive bushing is an outlet device that leads the high-voltage wire inside the transformer to the outside of the oil tank. It not only serves as the ground insulation of the lead wire, but also plays the role of fixing the lead wire. It is one of the important accessories of the transformer. [0003] The existing capacitive bushings are basically made of copper tubes coated with ceramic insulating materials, but the existing cera...

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Problems solved by technology

[0003] The existing capacitive bushings are basically made of copper tubes coated with ceramic insulating materials, but the existing ceramic insulating materials are generally made of clay, kaolin and other materials for firing porcelain. There is no obvious difference between the ceramic insulating material made of ceramics and ordinary ceramics. It only meets the insulation and waterproof functions, and there is a lack of a ceramic insulating material specially used for making transformer capacitor bushings.