Integrated output terminal structure of capacitive voltage divider

Abstract

The invention discloses an integrated output terminal structure of a capacitive voltage divider, comprising a medium voltage output terminal. The medium voltage output terminal is educed from the bottom of a ceramic bushing of the capacitive voltage divider, which is provided with a flange, and comprises a medium voltage output copper rod and an epoxy resin casting wrapping outside the medium voltage output copper rod, a copper net is pre-embedded in the epoxy resin casting as a low voltage output terminal, and a low voltage output port which is connected with the copper net is also arranged on the epoxy resin casting. The medium voltage output terminal and the low voltage output terminal of the integrated output terminal structure of the capacitive voltage divider are in an integrated structure, thereby efficiently lowering a local discharge level under the highest running voltage; and an external insulating layer is the epoxy resin casting, therefore, the invention has the advantages of simple structure, low local discharge level of equipment and high safety.

Description

technical field [0001] The invention relates to a power device, in particular to an integrated output terminal structure of a capacitive voltage divider with a lower partial discharge level. Background technique [0002] At present, capacitive voltage divider as a voltage transformer is widely used in power equipment. With the advancement of technology and the continuous improvement of product voltage levels, users have higher and higher requirements for the performance indicators of electrical products, and the partial discharge level It is one of the very important indicators. Partial discharge refers to the discharge that occurs at the weak point in the insulation of the product under the action of a certain applied voltage. Although partial discharge cannot immediately form a penetrating breakdown of the entire insulation, the product will continue to operate for a long time. In the process, the continuous development of partial discharge will gradually cause damage to t...

AI Technical Summary

Problems solved by technology

[0002] At present, capacitive voltage divider as a voltage transformer is widely used in power equipment. With the advancement of technology and the continuous improvement of product voltage levels, users have higher and higher requirements for the performance indicators of electrical products, and the partial discharge level It is one of the very important indicators. Partial discharge refers to the discharge that occurs at the weak point in the insulation of the product under the action of a certain applied voltage. Although partial discharge cannot immediately form a penetrating breakdown of the entire insulation, the product will continue to operate for a long time. In the process, the continuous development of partial discharge will gradually cause damage to the insulation, promote the aging of the insulation, and even eventually lead to the breakdown of the entire insulation.

[0003] see figure 1 as shown, figure 1 It is a structural schematic diagram of the output terminal of a traditional capacitive voltage divider. The porcelain bushing of the traditional capacitive voltage divider is equipped with a flange 3 at the bottom of the porcelain bushing, and the bottom of the flange 3 respectively leads to mutually separated A medium-voltage output terminal 1 and a low-voltage output terminal 2. The medium-voltage output terminal 1 includes a medium-voltage output copper rod 11 and an insulating polytetrafluoroethylene material layer 12 coated on the outside of the medium-voltage output copper rod 11. The low-voltage output terminal Terminal 2 includes a low-voltage output copper rod 21 and an epoxy casting 22 coated on the outside of the low-voltage output copper rod 21. The medium-low voltage output terminal of this structure has a relatively large partial discharge level under the highest operating voltage of the equipment, which will cause insulation layer damage, there is a certain safety hazard

Images