I. Introduction.
High-voltage solid-state soft start cabinet, high-voltage solid-state soft-start device is an intelligent motor starting device, suitable for 3 10kV squirrel cage asynchronous and synchronous motors. It is a motor terminal control equipment integrating starting, display, protection and data acquisition. In the power system, the high-voltage solid-state soft-start cabinet is a common electrical equipment. Its main function is to provide a smooth power transition to protect devices that have a significant impact on the grid from voltage fluctuations. Today, we're going to dive into how a high-pressure solid-state soft-start cabinet works.
Second, the working principle.
2.1 What is High Voltage Solid State Soft Start.
The high-voltage solid-state soft start is a starting method in which multiple thyristors are connected in series and parallel, and the output voltage is controlled by controlling the trigger angle of the thyristor, so that the motor accelerates smoothly, thereby reducing the electrical and mechanical impact of the motor start on the power grid, the motor and the connected equipment.
2.2 Structure of high-voltage solid-state soft start cabinet.
The high-voltage solid-state soft start cabinet can be divided into three functional systems according to its function: high-voltage loop system, signal acquisition and system protection system, control and human-computer interaction system. The three functional systems are insulated from each other and work together to achieve a smooth start of the motor.
High-voltage circuit system: thyristor module, valve body protection unit, vacuum switch components.
Signal acquisition and system protection system: trigger components, signal acquisition and protection components.
Control and human-computer interaction system: the system control and display components are composed.
2.3 Detailed explanation of the working principle.
The high-voltage solid-state soft start cabinet controls the input voltage by controlling the conduction angle of the thyristor, and realizes the change of the voltage value of the stator end of the motor, that is, the size of the starting torque and the starting current of the motor, so as to realize the soft start control of the motor. The high-voltage soft start accelerates smoothly according to the set starting parameters, thus reducing the electrical and mechanical impact on the power grid, motors and equipment. When the motor reaches the rated speed, the bypass contactor is automatically switched on. The high-voltage soft start continues to monitor the motor after start-up and provides a variety of fault protection.
3. Advantages and disadvantages.
Although solid-state soft start has many advantages, such as smooth start-up, no noise, no pollution, etc., there are also some potential problems, such as higher cost, requiring specialized knowledge for maintenance, etc. Therefore, when choosing whether to use solid-state soft-start, there are various factors that need to be considered.
IV. Conclusions. In general, the high-voltage solid-state soft start cabinet through the use of modern electronic technology, can effectively realize the smooth start of the motor, reduce the stress of the power system, protect key equipment, the user uses fewer components, you can achieve more complex control functions, in the process of motor operation, the high-voltage solid-state soft start cabinet can also continue to monitor the motor running status, real-time measurement of motor current, voltage and other parameters, and provide a variety of fault protection.