タイトルまたは説明

The principle and parameter
 
1, Standard anti-resonance type (connected with reactor of 6% or *2% reactance ratio in series)
This type device is mainly used in the system containing little harmonics and load change being high. Generally, the simple switching capacitor bank reactive compensation device will cause the shunt resonance of shunt capacitor and system, magnify the harmonics, make the voltage and current waveform distortion worse and even cause the capacitor temperature rise higher and shorten the service life of the capacitor. To solve the above problems, for the system of which the harmonic content essentially complies with Quality of electric energy supply - Harmonics in public supply network, connect one anti-resonance reactor in series to the reactive compensation device, make the resonant frequency of shunt capacitor lower than the minimum subharmonic frequency, keep clear of resonance point and avoid the harmonic magnification.
For the standard anti-resonance type low voltage dynamical compensating device with series reactor of 6% or *2% reactance ratio, if the power factor can be increased to 0.*5 or more, it will enable a certain harmonic filtration function
 
2, Smoothing type (special design filter tuned to a certain frequency)
 
This type is applicable to the system having the high harmonic content. SNTA***3 device has LC smoothing circuit consisting of filter capacitor and filter reactor. L-C circuit is designed to present low impedance (compared to the system impedance) at a certain resonant frequency to absorb most harmonic current. The manner, resonant frequency and capacity of filter vary from the system conditions. The non-standard filter requires special design and the harmonic current absorptivity can reach to *5% or more.
 
3, Compensation per phase
Some power grids may present the three-phase imbalance, in particular in the automotive and ship fabrication industries in which the electrical equipment mainly consists of the arc welders. If the compensation is made for all the three phases, the overcompensation may occur in a certain phase and consequently the three-phase imbalance will be worse. To solve this problem, the compensation per phase must be adopted.