High-power electric-arc-explosion-preventing rectifier

Abstract

A high-power electric-arc-explosion-preventing rectifier is disclosed. The rectifier comprises a sealing steel shell, an alternating current wire-inlet copper bar, a current-sharing connecting copper bar, an overvoltage absorption protection apparatus, a high-power silicon element, a high-speed fuse and a direct current wire-outlet copper bar, wherein the high-speed fuse is connected with the high-power silicon element in series to form a rectifying assembly, and the rectifying assembly is mounted in the sealing steel shell; each rectifying assembly is connected with the alternating current wire-inlet copper bar and the direct current wire-outlet copper bar separately through the current-sharing connecting copper bar; the sealing steel shell is full of transformer oil; a transformer oil insulating online detector is mounted on the sealing steel shell and immersed in the transformer oil; the sealing steel shell is equipped with a pressure relief valve; and a cooler is connected with the inner cavity of the sealing steel shell through an oil inlet / outlet connecting pipe. The high-power electric-arc-explosion-preventing rectifier provided by the invention is creative in design, high in insulation, compact in structure, simple and convenient to mount, small in occupied space, and capable of greatly improving the insulation property, the antifouling property and the thermal dissipation property, eliminating electric arc explosion accidents of the rectifier, and ensuring the safe and reliable operation of the overall power supply.

Description

technical field [0001] The invention relates to a high-power explosion-proof rectifier for converting AC power input into DC power output, in particular to a high-power arc-proof explosion-proof rectifier. Background technique [0002] In the existing conventional large-scale rectifiers, each high-power silicon element and fast fuse are connected in series to form an assembly, and multiple assemblies are connected in parallel through various current sharing techniques, and are supported in the air by insulating materials. The high-power silicon components are cooled by pure water, and the heat generated by the silicon components is taken away through pure water circulation, and the rectifier circuit is equipped with an overvoltage absorption protection device. When the output DC voltage of this type of silicon rectifier is higher than 600 volts, the air humidity will increase due to the pure water flowing inside, resulting in a decrease in the insulation level of the materia...

AI Technical Summary

Problems solved by technology

When the output DC voltage of this type of silicon rectifier is higher than 600 volts, the air humidity will increase due to the pure water flowing inside, resulting in a decrease in the insulation level of the material. The insulating material in the rectifier is prone to voltage breakdown and silicon element breakdown, and then quickly The arc phenomenon occurs when the fuse breaks the circuit. Due to the large capacity of the circuit grid, the arc often cannot be automatically extinguished, and the air ionized by the arc will generate a stronger arc, causing the silicon rectifier itself to explode and burn.

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