Electric power capacitor with prolonged service life

Abstract

The invention provides an electric power capacitor with a prolonged service life. The electric power capacitor comprises a shell and a plurality of single-core groups fixed in the shell. Each single-core group comprises a single core (1), a first electrode copper strip (10), a thermal fuse link (12) arranged between the first electrode copper strip (10) and the first metal spraying layer (11) of the single core (1), a second electrode copper strip (20), a thermoswitch (22) arranged between the second electrode copper strip (20) and the second metal spraying layer (21) of the single core (1), afirst insulating pad (13) used for the insulation of the first electrode copper strip (10) and the thermal fuse link (12), and a second insulating pad (23) used for the insulation of the second electrode copper strip (20) and the thermoswitch (22). According to the invention, other single cores can be effectively prevented from being influenced by the abnormal temperature of one single core. Therefore, safety hidden troubles are prevented from spreading. The service life of the electric power capacitor is prolonged.

Description

technical field [0001] The invention relates to the manufacturing technology of film capacitors, in particular to a power capacitor with extended service life. Background technique [0002] Power electronic capacitors, the product structure includes oil-immersed square stainless steel shell, dry square stainless steel shell, dry square plastic shell, etc. As DC support, connection, AC-DC filtering and circuit protection, the products are widely used in inverters for locomotives, trams, trolleybuses, mining locomotives, ships, hybrid electric vehicles and pure electric vehicles, wind power and solar photovoltaic power generation equipment In various power supply equipment such as flexible power transmission and transformation, smart grid, etc. This type of capacitor generally uses two layers of metallized film (a metal layer is coated on the light film, the metal layer is used as an electrode plate, and the light film is used as a medium) and is directly wound into a capacit...

AI Technical Summary

Problems solved by technology

The defect of this structure capacitor is that when any one of the single cores breaks down or overheats, it causes the temperature inside the metal shell to rise sharply, and increases the failure rate of the thermal breakdown of other single cores, which eventually leads to the failure of the capacitor. The overall failure and scrapping will seriously affect the service life of the capacitor

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