The active harmonic filter device is developed on the basis of passive filter, harmonic control prices, it's a good filtering effect, within its rated reactive power range, the filtering effect is one hundred percent. It is mainly composed by the power electronics circuits, to produce a harmonic frequency and the same system, with the magnitude of what is harmonic control, but the phase contrast harmonic current system harmonic current cancellation. However, due to power electronics voltage and rated current of development constraints, high costs, the production is also much more complex than the passive filter, the cost would be much higher. Its main application is a computer-controlled system of power supply systems, especially the office of the power supply system, power supply system control computer factory. For a single device, the profits are substantial, but users are generally reluctant to use active filter, the harmonic content, do not filter too clean, it does not endanger other appliances also do. The impact of harmonics on the capacitors is relatively serious, mainly in the following situations. Since the harmonic currents and capacitor overload, harmonic control, because the electrical resistance capacitor decreases as the frequency increases, which makes the capacitor is called absorption point harmonics. At the same time, the harmonic voltage can cause a large current capacitor fuse blows. Harmonic tend to make the dielectric loss increases, the price of harmonic control cabinet, which is a direct consequence of additional heat and equipment life shortening. Capacitors and power inductors combined constitute a parallel resonant circuit, the resonance frequency can be calculated. In the case of harmonic resonance is amplified, much higher than the final voltage capacitor voltage rating and cause damage or blown fuse. 4. Harmonics affect transformer transformer harmonic environment will be as follows damage. Increase the load losses. Load loss including copper losses and stray losses (winding eddy current loss). Stray losses are determined by non-linear loads due to the transformer core of the most important factors in additional heat loss. Increased hysteresis and eddy current losses. These losses will be greatly increased as the frequency increases, and eddy current loss caused by harmonics greater than the hysteresis loss caused by harmonics. May produce resonant inductance between the transformer and power factor correction capacitors. Since the peak voltage stress increases due to increased insulation. These losses will lead to heat transformers and the corresponding loss of life. Harmonic cabinet price | Xi Connaught Electrical and Mechanical | Harmonic study by Henan Connaught Electrical and Mechanical Equipment Co., Henan Xi Connaught Electrical Equipment Co. (www.hnxinuo.com) located in the south China city of Zhengzhou Area 6B 6B-3-342. Scraps and development in the wave of market economy, the current study Connaught Electrical and Mechanical has a high profile in the electronics, electrical products processing, enjoys a good reputation. Xi Connaught Electrical and Mechanical made whole network business alliance certification, marking our service and management level has reached a new height. Xi Connaught Electrical and Mechanical staff is willing to joint development with all people a better future.