The three elements of fire, namely fire source, combustibles, and oxygen, are equally applicable to the analysis of electrical fire accidents and prevention. Arc is an important representative of fire source elements in electrical fires. When electrical circuit insulation is aging, damaged, connector virtual connection, line virtual connection, and short circuit, faulty arcs will occur, (arc discharge) even within the rated current range. An arc occurs, and heat is generated at the same time as the arc occurs, enough to ignite adjacent combustibles.

During the operation of the inverter, heat is generated due to the loss of power equipment in the main circuit, which will affect the normal operation of electronic equipment. If the heat dissipation capacity of the inverter system is not strong, the power dissipation will result in the internal chip of the power electronic equipment. The source region temperature rises and its junction temperature rises. The power loss of power electronic equipment is exponentially related to its junction temperature [1], that is, its function decreases as the junction temperature increases. When the operating temperature of the equipment increases by 10°C, its power loss doubles [2]. Therefore, as medium and high-power inverters are used more and more widely, in order to improve their operational functions and reliability, it is very necessary and urgent to adopt reasonable external heat dissipation methods in the inverter system.

Do you know the common misunderstandings of frequency conversion use?

Beginning in the 1960s, high-tech companies represented by Danfoss began mass production of inverters, opening a new era of inverter industrialization. It wasn't until the 21st century that my country's local frequency converters gradually emerged. At present, my country's high-end inverter market has long been monopolized by foreign brands.

Due to the continuous development and advancement of power electronic technology, along with the introduction and improvement of new control theories, AC variable-speed drives, especially variable-frequency variable-speed drives with excellent performance, have developed rapidly. In recent years, the price of the frequency converter has been declining, but its use function has been continuously improved and expanded. It has now been widely used in the drive of some hundreds of watts of household appliances to some thousands of kilowatts of large industrial transmissions. AC variable frequency speed regulation has transitioned from being used only for speed regulation of fans and water pumps to being applied to various industrial sites requiring high-precision and fast response high-performance speed regulation indicators. The widespread use of frequency converters has achieved remarkable application effects in energy saving, labor saving, automation and productivity improvement, quality improvement, maintenance reduction and comfort improvement. However, the frequency converter is a new power electronic product that contains a variety of high and new technology in the past two decades. If you want it to play a good application effect, you must do in-depth research on its selection and configuration.