History and development of liquid resistance starters
In view of the difficulty in starting large and medium-sized wound asynchronous motors, in the 1930s, firstly, in developed countries, the use of liquid resistors to achieve the reduction of mechanical torque shock on medium-voltage wound rotor motors has been achieved. Performance has completely replaced other starting methods, but due to the limitations of its use environment and the rapid development of electronic technology, foreign countries have been completely occupied by solid-state soft start or frequency conversion technology in the field of motor starting, and liquid resistance starter Really flourishing at home. As early as the end of the 1970s, there were early liquid resistance starters that mimicked Japanese technology. Compared with foreign products, our manufacturing cost is low, the device is simple, and easy to maintain. Its performance and price are very suitable for China's national conditions. In the 10 years of the 1990s, the start-up of large and medium-sized wound-type asynchronous motors has been widely adopted. By analyzing the starting performance of the motor, a good starting process for the motor should have little impact on the grid. The start-up time is short, the impulse current impulse is small, the mechanical impact force is small, the noise is small, and the motor temperature rise is small.
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