The filter is developed and produced by Hongyan Company. It adopts Fourier analysis broadband filter technology, uses digital monitoring to store and record various electrical data, fully realizes automatic and intelligent switching filter circuit, and effectively filters out 5th, 7th, 11th harmonics. Purify the power transmission and distribution network, prevent electromagnetic interference, and improve the power factor of the inverter at the same time, which has a significant energy-saving effect. main component ●Filter capacitor bank ●Filter reactor ●circuit switch ●Contactor (or TSC thyristor switch) ●Protective device ●Discharge device ●Controller Harmonics of Frequency Converter and Its Restraint The rectifier circuit of the frequency converter generates harmonic currents. After the harmonic currents are injected into the grid, they will interfere with other electrical equipment and power supply equipment. According to relevant standards, these harmonic currents injected into the grid need to be suppressed and eliminated to protect the safety of electrical equipment. my country promulgated the harmonic management standard in 1993, which stipulates the installation, increase or update of products. Harmonic The maximum value of the harmonic current that occurs in electrical equipment If any harmonic exceeds the specified limit value, the user is required to take measures to control the harmonic. The harmonic current of a certain brand of inverter is shown in the table below. Inverter harmonic measurement results It can be seen from the measurement results that the 5th and 7th harmonics are the largest, exceeding the allowable value of the national standard.
product model
main feature ●Eliminate harmonic current, meet national standard requirements, and eliminate faults ●Improve the power factor to above 0.9, high efficiency and energy saving. ●Automatic control, dynamic filtering ●Steel plate shell, protection grade IP20o ●On-site installation, easy to operate. ●Suitable for all brands of inverters.
Technical Parameters
Technical data ●Installation location: indoor, on the floor or on the wall ●Rated voltage: 400V, 525V, 660V ●Filter efficiency: 70%In ●Protection grade: IP20B ●Working conditions: altitude ≤2000m ●Relative humidity 90% (+20°C ) ●Electrical connection method: cable or busbar ●Rated frequency: 50Hz (60Hz) ●Power factor: 0.95 ●Cooling: natural air cooling or fan ●Ambient temperature: +40°C~-10°C.
Inverter harmonic measurement results It can be seen from the measurement results that the 5th and 7th harmonics are the largest, exceeding the allowable value of the national standard. 
