14
2019
-
06
On-site Transformation Case of Centrifugal Air Compressor by Low Voltage Frequency Conversion Non-disturbance Switching Cabinet
Classification:
On-site Transformation Case of Centrifugal Air Compressor by Low Voltage Frequency Conversion Non-disturbance Switching Cabinet
On-site working conditions: American Shouli centrifugal air compressor, the air compressor is equipped with ordinary power frequency motor, rated voltage AC380V rated current 808A, rated power 450KW. Because the user's own power grid capacity is too small, the starting current of the motor is required not to exceed the rated current of the motor, so the centrifugal air compressor can only use the variable frequency starting method.
Field problem: Since the motor is an ordinary motor and a non-frequency conversion motor, this air compressor must be started by frequency conversion. Therefore, after the centrifugal air compressor is started by frequency conversion, the frequency converter is still running at 50HZ. The stator temperature of the motor is generally high and has been maintained at 126 degrees Celsius. The frequency converter itself also has loss and heating phenomena. This will instead make the frequency converter waste more electricity and energy when working at 50HZ than when running at power frequency, and the field harmonics are large. The capacitor of the field capacitor compensation cabinet is damaged many times due to the failure to control the harmonics.
Solution: After on-site communication and understanding, our company has specially designed a low-voltage inverter undisturbed switching cabinet for customers according to the actual problems faced by users. The frequency conversion of the air compressor is started, and then it is switched to the power frequency state without interference. When the frequency converter is running at 50HZ, the current of the frequency converter is only 300A, and the impact current is 600A when switching the power frequency, which is far lower than 808A of the rated current of the air compressor. When the air compressor is running at 50HZ, the stator temperature is also reduced from 126 degrees to 105 degrees, and the motor running current is 750A A. Everything is normal and the problem is perfectly solved.
Low-voltage inverter non-interference switching cabinet, our company is based on customer requirements and inverter into a whole cabinet. It is suitable for the working situation that the capacity of the customer's power grid is small and the motor cannot be started by other starting methods. The inverter starts the air compressor, the starting current is not greater than the rated current of the motor, and the starting time is about 30 seconds. When the frequency conversion of the air compressor is started, it is switched to the power frequency operation without disturbance, which can give full play to the advantage of the small starting current of the frequency converter. After switching to power frequency operation without interference, the problem of high temperature of the motor running at 50HZ of the frequency converter is avoided, and the service life of the motor is virtually prolonged. Working conditions like this article use tenghui electric low-voltage inverter without disturbance switching cabinet, which can perfectly solve the problem of small starting current, no need to do harmonic control, and more energy-saving.
The customer site transformation of our company with high efficiency, high quality successfully solved a series of problems arising from the use of frequency converter in the past, the customer is very satisfied.
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Xiangyang Tenghui Electric Manufacturing Co., Ltd.
Address: No.31, Qilihe West Road, Fancheng District, Xiangyang City, Hubei Province
Technical advice:86-0710-3129518
Sales:86-0710-3540669
Business Manager:86-18871091455
Fax: 86-0710-3236122
E-mail:xythdq@126.com