The active power filter detects the load current in real time through the external current transformer CT, and extracts harmonic components of the load current through internal DSP calculation, and then sends the harmonic components to the internal IGBT through PWM signals to control the inverter to generate a current with the same magnitude and opposite direction as the load harmonic and inject the current into the power grid to compensate the harmonic current, thus realizing the filtering function.

Static Var Generator (SVG) detects the load current in real time through external current transformer (CT), analyzes the reactive power content of the load current through internal DSP calculation, and then controls PWM signal generator to send control signals to internal IGBT to enable inverter to generate reactive power compensation current meeting the requirements according to the set value, finally realizing the purpose of dynamic reactive power compensation.

Arc suppression and overvoltage protection device (KWX for short) is a product developed to quickly eliminate the harm to electrical equipment caused by arc grounding of neutral point indirect grounding system. The device mainly consists of a three-phase combined overvoltage protector DCB, a high-voltage vacuum contactor JZ which can be controlled by phase separation, a microcomputer controller, a high-voltage current-limiting fuse assembly FU, a voltage transformer PT with an auxiliary secondary winding and the like.

TBBZ series high-voltage reactive power automatic compensation device automatically tracks and switches reactive power according to the power grid and load conditions of 6kV and 10kV power supply buses through the capacitor bank of the control system, with the power factor reaching above 0.9. Greatly optimize the power quality, save losses and reduce consumption, and improve the transmission capacity of the power transmission and distribution system.