High voltage frequency changer isolation trolley type high voltage switch cabinet

Abstract

The invention discloses a switch cabinet which is applied to the input side and the output side of a high-voltage frequency converter; the switch cabinet is characterized in that: a contactor (K1) for controlling the switch of the input side of the high-voltage frequency converter, a contactor (K2) for controlling the switch of the output side thereof and a contactor (K3) for power frequency switching over are arranged in the switch cabinet; two separating trolley type high-voltage separating switches (QS1, QS2) are arranged at the outer sides of the contactor (K1) of the input side and the contactor (K2) of the output side; the two separating trolley type high-voltage separating switches (QS1, QS2) are respectively composed of three fixed contacts and three moving contacts; six pairs of switch contacts can be arranged in a smaller space by adopting the structure; when maintaining the switch cabinet, the trolley is pulled out, and obvious visual break point exists in a high-voltage loop, thus realizing electric isolation between the high-voltage output side and the cabinet output side and the high-voltage frequency conversion and ensuring maintenance work to be safe.

Description

High-voltage frequency converter isolation trolley-type high-voltage switchgear technical field The invention belongs to the technical field of high-voltage switch cabinets, and in particular relates to a high-voltage frequency converter isolation trolley-type high-voltage switch cabinet of a high-voltage frequency conversion speed regulation system. Background technique With the rapid development of modern power electronics technology and computer control technology, the technological revolution of electric transmission has been promoted. It has become a development trend that AC speed regulation replaces DC speed regulation, and computer digital control replaces analog control. AC motor frequency conversion speed regulation is a major means to save electric energy, improve production process, improve product quality, and improve the operating environment. Frequency conversion speed regulation is recognized as the most promising speed regulation method at home and abroad...

AI Technical Summary

Problems solved by technology

Method 1 is relatively simple in structure, but no obvious electrical breakpoint can be seen on the site of the inverter. Electrical breakpoints, but still need two separate switch cabinets, the structure is more complicated, and the failure rate is high

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