This article focuses on the application of GGQ series high-pressure solid-state soft starters in 4 mixers of Lantian Paper. This article researches and combines engineering application practice to analyze the technical principles and characteristics of its GGQ series high-pressure solid-state soft starters. The application results show that, It can meet the individual needs of users for high-voltage soft-start devices, and has very important economic benefits and social value.

　　Foreword

　　With the rapid economic growth of our country and the rapid development of science and technology, intelligent control systems have been more and more widely used, and higher requirements have been put forward. As an important drive actuator motor, its control method is highly valued by the majority of technicians. It is necessary to lay a good foundation for intelligent control and reduce the impact of the motor on the power grid when the motor starts.

　　1. The condition of the equipment

　　The leaders of Yibin Lantian Paper Company after many investigations and investigations, compared with the cost-effectiveness, finally decided to choose Dayu Electric Technology Co., Ltd. GGQ series high-pressure solid soft starter to soft start the 4 mixer units on site. The two parties jointly formulated a soft start program through a full understanding and analysis of the production process and on-site use conditions, and the demonstration of the achievable program. The main parameters of the field equipment are as follows:

　　Rated power: 630KW

　　Rated voltage: 10KV

　　Motor load: mixer

　　2. Working principle

　　The primary main circuit is composed of thyristors in parallel and connected in series. The thyristor component protection circuit is composed of RC dynamic voltage equalization, static voltage equalization resistance, overvoltage protector, etc., and the secondary control circuit is composed of DSP central control system and other electrical parts. Composition, working voltage is 220V power supply. When the starter is working, the thyristor trigger signal is sent by the DSP central control system, amplified by the signal processing unit, and transmitted to the high-voltage trigger board through the optical solder. The trigger board controls the conduction angle of the thyristor to make the output voltage change from small to large . The starter's working procedure is generally to gradually increase the motor terminal voltage according to the preset starting parameter values ​​of the field working conditions, so that the motor accelerates smoothly, and the starting current changes within a preset multiple. When the motor speed gradually increases to the rated speed, start When the current drops below the rated current, the bypass contactor is closed and the starter is turned into running state, so that the starter can achieve the purpose of reducing the starting current of the motor.

　　3. Soft start design features

　　adopts humanized design, has a friendly Chinese display man-machine interface and a variety of combined control operation modes, which greatly facilitates the use of users.

　　The system control center adopts Harvard bus and computer fuzzy control technology. The whole machine has been subjected to high temperature aging and vibration experiments before leaving the factory to ensure reliable product quality.

　　The starting current, starting time, and load state voltage can be adjusted according to different on-site loads to reduce starting loss, generate the best starting torque with the smallest starting current, and start the motor and drag the load smoothly.

　　Adopting optical solder communication and voltage isolation technology, BOD protects the trigger circuit to prevent one of the thyristors in the thyristor valve group from being blocked, the protection trigger circuit quickly turns off other trigger signals, and protects the closed thyristor from breakdown.

　　Adopt advanced logic control unit to realize a brand-new programmable logic control, and can realize unit protection and self-locking in the event of any failure.

　　With RS-485 communication function, it can communicate with the host computer in two ways to adapt to the monitoring of peripheral equipment.

　　has the characteristics of reliable performance, installation, operation, and easy use.

　　4. Operation status

　　From the application effect of the soft start into operation, it fully meets the requirements of users, and its superiority is reflected in the following points:

　　(1) Simple operation and easy observation. All data and operating status during soft start operation can be displayed on the man-machine interface, such as input current, output voltage, output current, open and closed loop, etc. The man-machine interface is easy to operate and easy to observe.

　　(2) Reduced maintenance costs. The starting current is small, and there is no mechanical impact on the unit, correspondingly extending the service life of the motor, and greatly reducing the maintenance workload and maintenance cost.

　　(3) The starting is stable, the voltage will not drop sharply, and the normal operation of other equipment on the power grid will not be disrupted.

　　(4) Save the investment brought by increasing the transformer capacity.

　　5. Concluding remarks

　　GGQ series high-pressure solid-state soft starter is put into use, so that the reliability and safety of the system are obviously improved, and the work efficiency and economic benefits of the enterprise are improved.