The application field of filter

The application field of filter

I. communication industry

In order to meet the operation needs of large-scale data center machine room, the capacity of UPS in the communication and distribution system is increasing greatly. According to the investigation, the main harmonic source equipment of the communication low-voltage distribution system is UPS, switching power supply, frequency conversion air conditioning, etc. The harmonic content is high, and the displacement power factor of these harmonic source devices is very high. By using active power filter, the stability of communication system and distribution system can be improved, the service life of communication equipment and power equipment can be extended, and the distribution system can be more in line with the design specification of harmonic environment.

Ii. Semiconductor industry

The third harmonic is very serious in most semiconductor industries, which is mainly due to the large number of single-phase rectifier devices used in enterprises. The third harmonic belongs to the zero order harmonic, which has the characteristics of converging in the neutral line, resulting in excessive pressure in the neutral line and even the appearance of ignition, which is a great potential safety hazard in production. Harmonic can also cause circuit breaker trip, delay production time. The third harmonic circulates in the transformer and accelerates the aging of the transformer. Serious harmonic pollution will inevitably affect the service efficiency and service life of the equipment in the distribution system.

Petrochemical industry

Due to the need of production, there are a lot of pump loads in petrochemical industry, and many pump loads are equipped with inverter.The application of frequency converter increases the harmonic content of distribution system in petrochemical industry. At present, most of the inverter rectification links use 6 pulses to convert ac to dc, so the generated harmonics are mainly 5 times, 7 times and 11 times. Its main harm is the harm to the power equipment and the deviation in measurement. This problem can be solved by using active filter.

Chemical fiber industry

In order to greatly improve the melting rate, improve the melting quality of glass, and extend the furnace life and save energy, electric melting heating equipment is commonly used in the chemical fiber industry. These devices produce a large number of harmonics, and the spectrum and amplitude of the three-phase harmonics are quite different.

V. steel/medium-frequency heating industry

Medium frequency furnace, rolling mill, arc furnace and other equipment often used in the steel industry will have a significant impact on the power quality of the power grid, making capacitor compensation cabinet overload protection frequent, transformer and power supply line heating serious, fuse frequent fuse, and even cause voltage drop, flicker.

Vi. Automobile manufacturing industry

Welding machine is an equipment in automobile manufacturing, because the welding machine has the characteristics of randomness, speediness and impact, cause serious power quality problems make extensive use of welding machine, welding quality instability, high degree of automation of robot cannot work due to voltage instability, the reactive power compensation system can't normal use, and so on and so forth.

Seven, dc motor harmonic control

Large dc airports need to convert alternating current to direct current through rectifier equipment first. Due to the large load capacity of such projects, there is serious harmonic pollution on the ac side, resulting in voltage distortion, which may lead to accidents in serious cases.

Viii. Use of automatic production lines and precision equipment

In automatic production lines and precision equipment occasions, harmonic will affect its normal use, so that the intelligent control system, PLC system failure.

Hospital system

Hospitals have very strict requirements on the continuity and reliability of power supply. The automatic power supply recovery time T 15S in class 0 places, 0.5s T 15S in class 1 places, T 0.5s in class 2 places, total harmonic distortion rate THDu 3%, X-ray machines, CT machines and nuclear magnetic resonance machines are all loads with very high harmonic content.

Theatre/gymnasium

Thyristor dimming system and large LED equipment are all harmonic sources. A large number of third harmonics will be generated in the operation process, which not only causes low efficiency of power equipment in the distribution system, but also causes light strobe, noise and even failure of weak electrical circuits such as communication and cable TV. Digital filters have been widely used in modern telecommunication equipment and various control systems. Here are some of the most successful applications.

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