Dry-type power capacitor with built-in pressure explosion-proof equipment

Abstract

The invention belongs to power accessories, and particularly relates to a dry-type power capacitor with built-in pressure explosion-proof equipment. The dry-type power capacitor comprises a capacitor packet (3), wherein leads (1) are respectively and fixedly connected to the upper and lower ends of the capacitor packet (3); the periphery of the capacitor packet (3) is coated with a mylar (4), and a gap is reserved between the capacitor packet (3) and the mylar (4); a lower insulation sleeve (6) is arranged at the bottom end of the capacitor packet (3) coated by the mylar (4) in a sleeving manner; the space between the coating of the mylar (4) and the capacitor packet (3) is filled with an epoxy resin (2) for sealing; the periphery of the coating of the mylar (4) and the lower insulation sleeve (6) is coated with an aluminum housing (5), and a gap is formed between the aluminum housing (5) and the coating of the mylar (4). According to the dry-type power capacitor with the built-in pressure explosion-proof equipment, the phenomenon that the stretching action of the aluminum housing is influenced when the pressure inside the capacitor is suddenly increased can be avoided, the epoxy resin is difficult to expand and deform, and the performance is safe and reliable.

Description

Technical field [0001] The invention belongs to power accessories, and particularly relates to a dry power capacitor with a built-in pressure explosion-proof device. Background technique [0002] Cylindrical power capacitors are generally filled with silicone oil or microcrystalline wax, and have built-in pressure cut-off protection devices. However, long-term observations have found that the service life of oil-type or wax-type power capacitors in the same use environment is less than that of resin-encapsulated dry power Capacitors, and some cabinet designs cannot use square dry-type power capacitors, but can only use cylindrical capacitors. However, the circular capacitor directly potted with epoxy resin cannot start the pressure cut-off device when the overvoltage, overcurrent and heat are serious. At the same time, it affects the stretching action of the shell, causing the explosion-proof performance to be unable to start, so the safety and reliability are worrying. . Summa...

AI Technical Summary

Problems solved by technology

[0002] Cylindrical power capacitors are generally filled with silicone oil or microcrystalline wax, and have a built-in pressure cut-off protection device. However, long-term use observations have found that the service life of oil-type or wax-type power capacitors is not as good as that of resin-filled dry-type power capacitors under the same environment. Capacitors, and some designs that use cabinets cannot use square dry-type power capacitors, but only cylindrical capacitors

However, the circular capacitor directly potted with epoxy resin cannot activate the pressure cut-off device under the condition of severe overvoltage, overcurrent and heat generation, and at the same time affects the stretching action of the shell, so that the explosion-proof performance cannot be activated, so the safety and reliability are worrying.

Images