Increasable capacity integrated installation of high-low voltage variable frequency speed control

Abstract

A capacity increased low voltage frequency variable speed regulation integrated device, which is characteristic of that the output end of high voltage switch cabinet connected with the high voltage input end of transformer whose low voltage output end connected with the incoming line end of input side switch of frequency variator in power frequency / frequency variation switching device, the outgoing line end of switch connected with the input end of low voltage frequency variator. Said invention has advantages of high power, high efficiency, high reliability, sub harmonic, low temperature raising and energy saving etc.

Description

technical field [0001] The invention relates to a high-voltage motor, in particular to a high-voltage motor capacity-increasing high-low voltage frequency conversion speed regulation integrated device. Background technique [0002] As we all know, the total power consumption of various motors in my country accounts for more than 60% of the country's total power consumption. Among them, high-voltage motors of 10kV and above and medium-voltage motors of 3-6kV are commonly referred to as high-voltage motors, which are related to low-voltage motors. The ratio is about 20%:80% in terms of quantity (number of units), but 60%:40% in capacity (kW). In recent years, my country's total power consumption has reached more than 1.2 trillion kW h. For example, the power consumption of motors accounts for 60% of the total power consumption in the country, and the power consumption of high-voltage motors accounts for 60% of the power consumption of motors. According to 30%, the micro (single...

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Problems solved by technology

Its disadvantages: First, the wound rotor is troublesome to maintain due to slip rings and brushes, and there are many faults; second, the thyristor, the main component of the frequency converter, has low carrier frequency and large high-order harmonics, which often exceed the national standard limit value of 4%. Low factor, narrow speed range

[0016] Although the above frequency conversion speed regulation technical solutions for high-voltage motors are different, they have a common disadvantage, that is, the motor is affected by factors such as large internal resistance of the frequency conversion power supply, high-order harmonics generated, and voltage drop. , the motor cannot reach the rated power, which is why "the output of the motor is low after changing to frequency conversion speed regulation", or even "not as powerful as the hydraulic coupling"

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