Overview of technical requirements for high-power liquid resistance starters
In order to improve the starting performance of large and medium-sized wound asynchronous motors, it is usually started with a liquid resistance starter. Its working principle is to reduce the starting current by serially inserting the liquid resistance in the rotor circuit of the motor. On the other hand, it can reduce the mechanical torque shock, and the drive motor can drive the transmission mechanism to realize the automatic stepless adjustment resistance value. The resistance is reduced from large to zero, and the motor is smoothed without impact. The product overcomes many shortcomings such as large starting current of the starter, inconvenient operation and continuous starting, and completely solves the problem that the large and medium-sized motors are difficult to start.
When the starting requirements of high-power vertical winding asynchronous motors are special, we need to solve the different needs of users through special scheme design. The following is the specific technical requirements of a user.
2.1 Motor parameters: rated power: Pe=8500KW (winding motor vertical structure); rated voltage: Ue=6000V; rated current: Ie=985A; secondary voltage: U2e=2498V; secondary current: I2e=2062A; rated Speed: ne = 490 rpm;
2.2 The motor needs to be started continuously, and the number of starts per day is ≥ 40 times;
2.3 The starting time of the motor is 8~20min, and the speed is adjusted in a fixed cycle; the starting time can be adjusted according to the requirements;
According to the technical requirements, the company's R&D personnel have fully studied the advantages and disadvantages of various starting methods, the temperature rise of the motor starting, the limit of the number of starting times, and absorbed the essence of modern liquid resistance technology, and developed a new generation of liquid resistance starting. And the high-power motor rotor circuit is used in series to realize smooth start of the motor without impact, which reduces the mechanical impact of the starting torque on the unit, greatly improves the mechanical characteristics of the controlled motor, and can realize the motor multiple times. Stopping the request and successfully passing the user's acceptance, successfully solved other special technical requirements.
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