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Drawer type active filter

Power quality
Drawer type active filter
2018/07/30 16:06
Product description
Technical parameters

Drawer type active filter





Drawer type active filter - the active power filter unit with IGBT (Insulated Gate Bipolar Transistor) switch as the core, detects system current in real time, separates the harmonic current successively based on digital fast Fourier transform technique, generates control signals according to the set compensation percentage to drive the IGBT to generate compensation currents of equal magnitude and opposite phase, which offset each other with harmonic components of system current to achieve harmonic filtration effect.



Technical parameters


Rated voltage

Line voltage: 0.38kV±20%; Phase voltage: 0.23kV±20%


50Hz±5%or60 Hz ±5%

Rated current

30A, 45A, 50A, 60A, 75A, 80A

Overload capacity

120% rated compensation current/60s

Response time



≤2.5% am)

Compensation rate


Total Harmonic Current Distortion

THDi ≤ 3% (full load)



Switching frequency


Function set

Combination of harmonic compensation, reactive compensation, unbalance compensation and free compensation with priority

Cooling method

Air cooling

CT position

Free selection on load side or power side


RS485, LAN, Modubus protocol support



Product’s terminal block diagram


抽屉式有源滤波器产 抽屉式有源滤波器产

(Plug-in terminal type)

(Pluggable terminal type)


Product advantages

 Advanced control architecture and powerful arithmetic capability

The multi-core digital control architecture of DSP+FPGA+ARM is used to make full use of the hardware parallel processing advantage of FPGA and DSP digital signal processing capability, which greatly improves the computational processing capability and response speed of the control system.

 Modular design for easy installation

Modular design is used, with compact structure, the unique cooling channel of good heat dissipation effect and simple wiring, which greatly saves assembly time and space.

 Flexible wiring mode

Be provided with phase sequence self-adaption, and there’s no need to distinguish the phase sequence of A/B/C phase, which simplifies the installation procedure; The system current transformer can be located on the system side or on the power side, which reduces the difficulty of reconstruction.

 Three-level technology

The hardware configuration is more reasonable with the use of three-level topology, which greatly reduces the volume and loss of drawer type active filter and conforms to the development direction of energy saving of power grid

 Paralleling of multiple operation modes

Be provided with three operation modes of unbalanced current compensation, harmonic filtration and reactive compensation, and these three operation modes can be freely combined according to priority setting.



Product size




Capacity (kvar.)

30A 45A 45A 50A 60A 75A 80A


500 500 500 500 500 500 500


190 190 190 190 190 190 190


550 550 550 550 550 550 550