Ceramic structure glue impregnated fiber capacitive bushing and use method thereof
A structural adhesive, capacitive technology, used in circuits, electrical components, lead-in/punch-through insulators, etc., can solve the problems of weak oxidation stability, voltage breakdown, high kinematic viscosity, and avoid material fracture or delamination , High thermal oxidation stability, not easy to polycondensate effect
Pending Publication Date: 2022-01-18
江苏金安电气有限公司
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Problems solved by technology
Dry-type high-voltage bushings mainly include glue-impregnated corrugated paper type and glass fiber winding type. Glue-impregnated corrugated paper-type capacitive bushings have the following problems: 1. The traditional capacitor plate is made of aluminum foil, and the structure of aluminum foil is dense and impermeable. materials, and it is often necessary to set multi-layer capacitor plates according to the voltage level in a bushing, which will cause the flow direction of the epoxy resin and the curing internal The stress is blocked and shielded by the metal plate, and it is easy to form an air gap, or the solidified internal stress cannot be released, resulting in delamination and formation of defects, which often lead to partial discharge failure of the product, or breakdown due to insufficient withstand voltage; 2. Mineral insulating oil as an insulating cooling medium is difficult to meet people's requirements for ecological and environmental issues. Natural ester insulating oil is derived from vegetable oil crops. It is a high ignition point, green and environmentally friendly liquid insulating dielectric. Weak characteristics make it limited in application
[0004] The Chinese patent application number is CN202110040971.9, which discloses a new type of dry bushing for power systems. The capacitor core in the structural glue-impregnated fiber capacitive bushing cannot form an isotropic uniform material, form layers, crack defects, mineral insulating oil is not environmentally friendly as an insulating cooling medium, and natural ester insulating oil has defects. solve
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[0039] The method for using the ceramic structure glue-impregnated fiber capacitive bushing of the present invention is to use the conductive rod 1, the insulating layer 2, the capacitor plate 3, the medium-chain fatty acid ester insulating oil 4, the connecting terminal 5, the flange 6, The porcelain structure 7 is assembled into a porcelain structure glue-impregnated fiber capacitive bushing, and then used in an AC power system or a DC power system.
[0040] Before the assembly, it is necessary to prepare the medium-chain fatty acid ester insulating oil 4 first, and the preparation of the medium-chain fatty acid ester insulating oil 4 includes the following steps:
[0041] (1) Mix the medium-chain fatty acid, trimethylolpropane and xylene, then add the catalyst, and after mixing evenly, carry out the heating reaction through the oil bath under the nitrogen protection environment, and keep the temperature at 150°C during the reaction process. The rotating speed of the magneti...
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Abstract
The invention relates to a ceramic structure glue impregnated fiber capacitive bushing and a use method thereof. The ceramic structure glue impregnated fiber capacitive bushing comprises a conducting rod, wherein the outer side of the conducting rod is wrapped with an insulating layer, the insulating layer is formed by winding an insulating material, a plurality of layers of capacitor electrode plates are sleeved in the insulating layer, all the capacitor electrode plates are of concentric cylinder structures with different diameters, the capacitor electrode plates are matched with the insulating layer to jointly form a plurality of multi-layer capacitors, and the insulating layer is filled with medium-chain fatty acid ester insulating oil. According to the ceramic structure glue impregnated fiber capacitive bushing and the use method thereof, the structural design is reasonable; and the capacitor electrode plates are matched with the insulating layer to form a multi-layer capacitor, then the multi-layer capacitor is used for uniformly sharing voltage, the insulating layer is filled with the medium-chain fatty acid ester insulating oil, and the medium-chain fatty acid ester insulating oil has the characteristics of high oxidation stability, low viscosity and high flash point, and has better anti-aging performance compared with natural ester insulating oil, .
Description
technical field [0001] The invention belongs to the technical field of capacitive bushings, and in particular relates to a ceramic-structure glue-impregnated fiber capacitive bushing and a method for using the same. Background technique [0002] The safe operation of power cables and their accessories is the basic guarantee for the safety of the entire power system. Compared with the cable itself, the cable accessories are the weak link. The probability of transmission line failures in the past shows that the failure rate of cable accessories accounts for about 70%. Therefore, the cable terminal is a key connection device, and its operating status will directly affect the safe operation of the cable line. [0003] To ensure the stable and reliable operation of the cable terminal, the design of the high voltage bushing is extremely important. Dry-type high-voltage bushings mainly include glue-impregnated corrugated paper type and glass fiber winding type. Glue-impregnated c...
Claims
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IPC IPC(8): H01B17/28H01B19/00
CPCH01B17/28H01B19/00
Inventor 安泽庆张艺潇
Owner 江苏金安电气有限公司
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