As a new generation of programmable smart meter, the digital power factor meter is mainly used for real-time measurement and indication of rate factor and phase (rate factor angle) values ​​in single-phase or three-phase power lines, and through RS485 interface or analog quantity change. The output interface transmits the measured power data remotely. Through the instrument keyboard, it is very convenient to set the upper and lower limits (or range) of the meter and the switching difference, the communication address and the communication baud rate, the transmission output mode, the transmission output range, and the digital filter coefficient. It has the characteristics of high measurement accuracy, good stability, long-term work-free calibration, and the ability to set parameters through the panel buttons. It is an ideal replacement for the original pointer rate factor, phase meter or common digital rate factor and phase meter.

Power factor is a factor that measures the efficiency of electrical equipment. The low power factor indicates that the reactive power of the circuit for alternating magnetic field conversion is large, thereby reducing the utilization rate of the device and increasing the power loss of the line. Too low a power factor can lead to voltage collapse and grid collapse accidents. Increasing the power factor through the digital power factor meter is extremely beneficial for saving power, reducing losses, and improving the power supply capacity of the power distribution equipment. The economic and social benefits are obvious.

By improving the power factor, the total current in the line and the electrical components in the power supply system, such as the capacity of the transformer, electrical equipment, wires, etc., are reduced, thereby reducing the investment cost and reducing the loss of its own power. Ensuring a good power factor value reduces the voltage loss in the power supply system and makes the load voltage more stable and improves the quality of the power. It can increase the margin of the system and tap the potential of the power supply equipment. If the power factor of the power supply system is low, then after installing the capacitor, the power factor can be increased and the load capacity can be increased. . The user's electricity bill is reduced; the power loss is reduced by the reduction of the above-mentioned components and the increase in the power factor of the time factor. Therefore, it is necessary to measure the power factor using a digital power factor meter . After the measurement, make corresponding adjustments to the power factor meter!

The power factor meter, also known as the phase meter, can be divided into three categories: electric system, ferromagnetic electric system and electromagnetic system according to the measuring mechanism, which is used to measure the power factor of the user.

Principle of digital power factor meter:

On the B2 branch is a purely resistive circuit, the current and voltage are in phase, the B1 branch is a purely inductive circuit (ignoring the action of R1), and the current lag voltage is 90°. When the voltage is turned on, the current through the current coil generates a magnetic field. The strength of the magnetic field is proportional to the current. At this time, the current in the two voltage coils B1, B2 will generate a rotational moment M1 according to the principle that the current carrying conductor is forced in the magnetic field. M2, because the voltage coils B1 and B2 are wound in opposite directions, the torque acting on the meter measuring mechanism is one of the turning moment and the other is the reaction torque. When the two are balanced, they stay at a certain position, as long as the coil and the machine are made. When the angle satisfies a certain relationship, the pointer deflection angle of the meter does not change with the magnitude of the load current and voltage, but only depends on the phase angle of the voltage and current in the load circuit, and the digital power factor meter indicates the power factor in the circuit.