Liquid soft starter for high-voltage motor

Abstract

The invention provides a liquid soft starter for a high-voltage motor, which is equipped with an air draft heat extraction device and can effectively discharge both hot gas and harmful gases generated in a liquid resistance box so as to improve the starting efficiency and security of a starting cabinet. The liquid soft starter mainly comprises a cabinet body, three liquid resistance boxes, a vacuum contactor, air ducts with sufficient heights to extend out of a top cover plate of the cabinet body, anti-corrosion waterproof fans and auxiliary radiator fans, wherein the liquid resistance boxes, the vacuum contactor and an electric control room are all arranged in the cabinet body; the air ducts are mounted on the upper cover plates of the liquid resistance boxes; the anti-corrosion waterproof fans are mounted at the outermost end of the air ducts; and the auxiliary radiator fans are mounted at the lower end part of a rear seal plate of the cabinet body. By adopting the technical scheme, the cooling of the liquid resistance boxes can be greatly accelerated, the starting efficiency is improved, and energy consumption is lowered; and meanwhile, as the harmful corrosive gases in the liquid resistance boxes is discharged by force, the security is enhanced and potential hazards of failures are avoided.

Description

technical field [0001] The invention relates to a liquid soft starter for a high-voltage motor, in particular to a liquid soft starter for a high-voltage motor with the function of exhausting heat. Background technique [0002] The starting of large, medium power and medium and high voltage AC motors has always been a difficult problem in the industry: direct starting not only has a large impact on the grid voltage, but also has a great impact on the mechanical performance, and will also cause a significant drop in power factor and increase the power grid. load. [0003] Now, although there are soft starter products such as high-voltage inverters and solid-state soft starters, their high prices and harsh operating environment requirements also limit their use in various industries. At the same time, the liquid resistance starting cabinet is widely used because of its low price, relatively good stability and loose operating environment requirements. [0004] However, this l...

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Problems solved by technology

[0006] 2. After each start, the water temperature of the liquid resistance will rise, and then a small amount of harmful corrosive gas will be generated. These harmful corrosive gases will slowly accumulate in the liquid resistance water tank and cabinet. After a long time, it will not only corrode the cabinet. More importantly, the accumulation of these harmful gases will eventually condense on any object in the cabinet, including exposed high-voltage conductors, which can easily cause high-voltage discharge or even high-voltage short circuit, which has a major hidden danger of failure;

[0007] 3. The volume of the liquid resistance box is large, which leads to the increase of the overall cabinet body, which greatly increases the production cost;

[0008] 4. Occasionally there are examples of starting failure due to low starting quality

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