Cascaded explosion-proof frequency converter with expandable voltage classes

Abstract

A cascaded explosion-proof frequency converter with the expandable voltage class comprises one or more than one explosion-proof frequency converter; the explosion-proof frequency converter is composedof an explosion-proof shell, a buffer loop, a phase-shifting transformer, a cascade unit and an expandable controller, wherein the buffer loop, the phase-shifting transformer, the cascade unit and the expandable controller are arranged in the explosion-proof shell. The explosion-proof shell is provided with an input cable connector, an output cable connector, a reserved cascade cable connector, areserved power supply cable connector and a signal interface for expansion. Based on the cascaded explosion-proof frequency converter, according to the power of mining production equipment, one, twoor more explosion-proof frequency converters are selected for cascade connection, a frequency converter with 3.3 kV, 6kV or 10kV voltage class output can be formed. The technical problems that loss isincreased and full-band adjustment cannot be achieved due to the fact that a frequency converter and a boosting transformer are used are solved, the problem that secondary winding groups of an injection molding type phase-shifting transformer in a high-voltage explosion-proof frequency converter are few is solved, and finally expanded application of the unit series multi-level technology in explosion-proof frequency converter products is achieved.

Description

technical field [0001] The invention relates to a cascaded explosion-proof frequency converter, more specifically, to a cascaded explosion-proof frequency converter with expandable voltage levels. Background technique [0002] Explosion-proof frequency converters are more and more widely used in mines. However, compared with popular 660V / 1140V frequency conversion devices, high-voltage, large-capacity motors are still relatively weak in the application of frequency converters. Most of them are still directly started by explosion-proof switches or magnetic starters, which have a large impact on the power grid and are prone to failure, and the load adjustment method has a large loss. [0003] Restricted by the special underground environment and other factors, the high-voltage mining explosion-proof frequency converter started late, failed to form industrialization in the coal field, and was not widely popularized and applied. With the continuous improvement of the production...

AI Technical Summary

Problems solved by technology

However, the lead wire structure of the cast water-cooled phase-shifting transformer is complex, which makes the overall production of the transformer difficult and there are few manufacturers. This situation greatly limits the popularization and use of the cascaded topology in high-voltage explosion-proof products.

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