Factory production of active filter internal components imported brand components, product quality to ensure the life and noiseless operation and low maintenance costs, simple installation model APF-0.4-400-3L meaning:... APF active, 0.4 voltage, harmonic current 400 A, 3L three-phase three-wire, 4L three-wire four-wire APF active filters filtering principle works in real time via an external transformer current signal acquisition CT, separated by internal detection circuit which harmonic part, through IGBT power conversion harmonic components generated by the system is equal to the offset current opposite in phase to achieve harmonic filtering function. The output current compensation system is based on the amount of harmonic dynamic, so there is no over-compensation. In addition, internal overload protection function, when the harmonic filter is larger than the capacity of the system can be automatically limited to 100% of rated output capacity, the filter overload does not occur. Reactive power compensation principle can be set by parameters, so the harmonic filter simultaneously dynamic reactive power compensation. According to the reactive power detection system, produced by the IGBT power converter capacitive or inductive fundamental current, dynamic reactive power compensation, reactive power compensation target set by the operation panel. Reactive power compensation current is dynamic based on the amount of reactive power demand will occur over compensation, flexible, reactive power compensation will not produce surge impact. After the closing of internal control principles isolation switch, first by pre-charging resistors for DC link capacitors, this process will continue for a few seconds after power is to prevent the DC bus capacitors instant impact. When the bus voltage Udc reaches a predetermined value, the main contactor is closed. DC bus capacitors as energy storage elements, as outward through the IGBT inverter output and internal compensation current reactors to provide energy. CT real-time acquisition through external current signal to a signal conditioning circuit, and then sent to FPGA controller, the controller fundamental component separation, and extract all the harmonics; controller will be collected and issued harmonic components comparing the difference obtained as the offset current signal to the driver in real time compensation circuit IGBT inverter trigger load harmonic current generated in opposite phase with the harmonic currents injected into the grid to achieve harmonic filtering function. Features and Applications 3L applications and features suitable for industrial-type active power filter 3L capacity load for rectifier, inverter, large UPS, intermediate frequency furnace, electric arc furnaces, welding. Chemical and other industrial-type high-capacity non-linear loads, launched 3L Series Active Power Filter. 3L series active power filter with the filter unprecedented ability to simultaneously filter out harmonics from 2 to 50, the filter capacity can be up to 97% of a step change is less than the time to fully compensate harmonic 10ms. 3L series of multiple active power filter can run simultaneously in parallel, fully applicable to the industrial areas of all the circumstances, is the best solution for high-capacity industrial-type nonlinear load harmonic governance. 4L applications and features suitable for civilian-type active power filter 4L Today fluorescent lights, computers, UPS, elevator, inverter air conditioner extensive use of commercial building sector, not only polluted the power grid, and its harmonics generated by the superposition of three to the of the line, so that the neutral line fever, a serious threat to the security distribution systems for commercial mixed loads, launched 4L series active power filter. 4L can completely eliminate the neutral line current harmonics generated by the three, you can eliminate all the range of 2 to 50 times the number of harmonics or selected, with communications functions, can be easily connected to the user's existing communication systems. 4L multiple active power filter can be run in parallel at the same time, the security of civilian areas suitable for a variety of conditions, commercial buildings and other civilian areas of the distribution system indispensable electrical equipment. Technical features basic characteristics l load short circuit, overvoltage, undervoltage, overcurrent protection. l using high-resolution, 5.7 inches color touch screen Chinese. l have to eliminate phase imbalance function. l will not resonant with the system occur. l Standby function can be managed. l can only filter, or both filtering and reactive power compensation, and set priorities functions. l design selection simple, does not require a detailed analysis of the grid, you only need to measure the size of the harmonic currents. l parallel installation, the installation is simple, convenient, easy to expand, to multiple parallel. l different capacity can be achieved in parallel. l implement fault logging and event logging, and query history.