Low Voltage Dynamic Reactive Compensation DEVICE

الوصف

Function of device
 1. Stabilize the voltage and enhance the voltage qualification rate;
 2. Dynamic reactive compensation enhances the power factor;
 3. Absorb the harmonic current, reduce the equipment temperature and prolong the service life;
 4. Enhance the power factor, reduce the line loss and save the electric energy;
 5. Release the transformer capacity, enhance the transformer utilization ratio and increase the active output of transformer.

Features of device

1.Through the thyristor, the automatic contactless switching of each filter bank is achieved; the filter employing the advanced thyristor flexible switching technology and special process design avoids the rush current and transient impulse generated by the conventional contactor switching and thyristor zero-cross switching, allowing the subsequent operation without discharging. This will prolong the service life of dynamic compensation system.
 2. It can not only automatically trace the system reactive load variation, carry out quick reactive compensation, but also smooth the harmonic current in the power system to maintain the power factor within the specified range. Besides, the capacitor and reactor in series can avoid the harmonic magnification.
 3. The filter bank switching controlled by the controller enhances the quick-response capacity of filter bank and allows the dynamic and frequent switching according to the load condition of power distribution system. The dynamic response time does not exceed *0ms.
 4.The powerful functions and easy adjustment LCD controller enables the real display of system voltage, power factor, system filter bank number and compensation current etc. It can program the power factor, overvoltage value, no-voltage value, overcurrent value, percent harmonic distortion value, switching time-lag and allows the warning functions for overvoltage, overcurrent, undercurrent and equipment temperature of *0℃ etc.
 5. It can realize the three-phase switching or switching per phase according to the three-phase equilibrium load and out-of-balance load.
 6. This equipment is specially designed according to the custom system to enable the evident smoothing effect and meet the national standard. The power factor after compensation is not less than 0.*3.
 SNTA***3 low voltage dynamic reactive compensation smoothing equipment adopts the thyristor switching electric power filter to supply a new solution to the dynamic compensation of increasing the power factor, smoothing the harmonics, stabilizing the voltage, improving the quality of electric power, saving energy and reducing the loss.


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.