Low Voltage AC Drive

Project location: An equipment industrial parkMain harmonic sources:A large number of loads such as frequency inverters, heating equipment and welding machines will generate a large amount of harmonics during operation.Picture: Testing HarmonicsWhy is it necessary to control harmonics?

CMC-MX soft starter is suitable for starting and protecting general squirrel-cage AC asynchronous motors. Adapted motor power from 7.5kW to 280kW. It can smoothly start/stop the motor without steps, avoid mechanical and electrical shocks caused by traditional methods such as direct start, star/delta start, auto-coupling step-down start, etc.

XiChi XPQ Active Filters are used for Harmonic Reduction in Haier IOT Center. The active power harmonic filter (APF/AHF) suppresses the harmonic current on the load side to a great extent, and the overall harmonic filtering effect is obvious.

In the process of starting the motor, the soft starter gradually changes the conduction angle of the thyristor, so that the starting current of the motor rises smoothly from zero to the maximum value. The whole process runs smoothly, the reliability of the motor power supply is high, the impact torque on the mechanical load is reduced, the impact on the motor itself is small, and the service life of the motor and the entire equipment is prolonged.

The harmonic control technology of active filter equipment is one of the effective means to improve the quality of power supply. After the popularization and application of APF in the power supply system of hospital buildings, the generated harmonics can be controlled within the minimum range. Realize scientific and rational use of electricity, restrain grid pollution, improve power quality, ensure the safety of medical equipment, and bring huge economic and social benefits to users.

Project requirementsHigh voltage soft start device10KV 280kw * 8 units400kw * 6 unitsHigh voltage SVG1 unit

The use of high-voltage motor soft-start device can effectively improve the service life of the pump and the reliability of power supply. CMV series of products are widely used in electric power, building materials, chemical industry, metallurgy steel, paper making and other industries with rated voltage of 3000-10000V. It can be used well with various electromechanical equipment such as water pump, fan, compressor, pulverizer, mixer, belt conveyor, etc. It is an ideal high-voltage motor starting and protection equipment.

The VFD has achieved remarkable power-saving effect when used in the drive control of fans and pumps. It is an ideal speed control method. It not only improves the equipment efficiency, but also meets the production process requirements, and greatly reduces the equipment maintenance and repair costs, and also reduces the shutdown period.

Using VFD for speed regulation, it is convenient to realize multi-stage speed regulation of mining winches, and improve system stability and safety. It reduces operation failures and downtime, saves manpower and material resources, improves coal transportation capacity, and also has considerable indirect economic benefits.

APF is a new type of power electronic device for dynamically suppressing harmonics and compensating reactive power. It can quickly track and compensate harmonics of different sizes and frequencies. Compared with the passive filter device, the active filter device has better treatment effect, and it can mainly filter out multiple and high-order harmonics at the same time without causing resonance.

CFV9000A series high-voltage variable frequency speed regulation system, with high-speed DSP as the control core, adopts space voltage vector control technology and cell-series multi-level technology, with high reliability, easy operation and high performance as the design goals, to meet the needs of users for various load adjustments.

APF can not only compensate various harmonics, but also suppress flicker and compensate reactive power; the filtering characteristics are not affected by system impedance, etc., which can eliminate the risk of resonance with system impedance; it has an adaptive function, which can automatically track and compensate for changing Harmonics, that is, have the characteristics of high controllability and fast response.

XFC500 variable frequency drive is used in amusement ride to realize functions such as speed regulation, energy saving, and protection of mechanical equipment. With small size, light weight, large torque, high precision, strong function, high reliability, simple operation, easy communication and other functions.

The soft starter integrates motor soft start, soft stop and multi-function protection. In the heating industry, soft starters can be used in various applications of squirrel-cage asynchronous motors that do not require speed regulation, especially suitable for various pump loads or fan loads that require soft start and soft stop.

Application of CMV HV soft starter in piston pump in petrochemical industry.

Project Overview:The 1850 water pump house of Yaojie Coal and Electricity Group used oil circuit breaker to control high-voltage electricity, and reactor was used for starting, with large starting current and little protection function.

OverviewProduct model: CMV-800-10Load type: Crushing machinePhoto

Project infoLoad type: induced draft fanRated voltage: 10KVMotor rated current: 54ANumber of motor poles: 6 polesHigh voltage soft start model: CMV-900-10On-site parameter setting:Starting voltage: 65%Current limit multiple: 4 timesStartup time: 20Project infoLoad type: induced draft fanRated voltag

Frequency inverter applied to glass tempering furnace advantages: Low frequency and stable operation during standby, saving energy; The starting current is small, the impact on the power grid and machinery is small, and the service life of the equipment is prolonged; Quick start, shorten the production process and improve production efficiency; Control the frequency required for fast response, and control to meet the production process requirements.

The application of frequency inverters to plastic extruders has the advantages of reducing production energy consumption, improving productivity and product quality, and reducing the impact on the power grid during startup. The main extruder is composed of extrusion system, transmission system and heating and cooling system. ​The transmission part usually consists of a motor, a reduction box and a bearing.