【Symbol】

   Q, Qa, Qb, Qc

【Unit】

   Var, kVar

【Definition】/【Calculation Formula】

   Reactive power is generated by the phase difference between voltage and current in an AC circuit due to the presence of reactance (inductance or capacitance). Although it does not consume active power, it participates in the energy exchange with the power source, thus creating reactive power. Many electrical devices operate based on the principle of electromagnetic induction, such as distribution transformers and electric motors, which rely on alternating magnetic fields for energy conversion and transmission. The electrical power required to establish these alternating magnetic fields and induced magnetic flux is known as reactive power. Therefore, "reactive" does not mean "useless" power; it simply does not convert into mechanical or thermal energy. Both reactive and active power sources are essential in power supply and utilization systems.

Q=√3UIsinΦ

【Hazards】

   Insufficient or excessive reactive power can have adverse effects on power supply and utilization, mainly manifested as follows:

   1. Insufficient reactive power leads to increased voltage drop in the lines and higher energy losses.

   2. It causes low power factor operation, which prevents the full utilization of electrical equipment capacity.

   3. Excessive reactive power can cause voltage elevation (especially during light loads at night), which can harm the normal operation of equipment.

【Product】

   Most of our company's instruments, including the entire MA series, DZS series, and the majority of the MS series, can measure reactive power.

【Related Terms】

   Active power

   Apparent power

   Peak-to-valley difference: The difference between the maximum load and the minimum load.

   Peak-to-valley difference ratio: The ratio of the peak-to-valley difference to the maximum load.

   Load factor: The percentage ratio of the average load to the maximum load.