The size of the power factor table (Power Factor) is related to the load properties of the circuit. The power factor of the resistance load such as incandescent light bulbs and resistance furnaces is 1. Generally, the power factor of the circuit with electrical sensing load is less than 1.Power factor is an important technical data of the power system.The power factor is a coefficient that measures the efficiency of electrical equipment.Low power factor, indicating that the circuit is used to transform the magnetic field conversion, which has a large non -effective power, which reduces the utilization rate of the equipment and increases the power loss of the line.
How to look at the power factor table
If the power factor table is installed, it can be seen directly. If there is no power factor table with a metering electric meter, there are generally some meritors and no merit indicators. Observe the shiny speed of the two lights.The size of the size, if there is a meritoric table and a non -active electricity meter, can infer the power factor according to the operating speed of the two tables.
Power factor table principle
After connecting with the resistor R series with the resistor R, the power supply voltage U is combined with the fixed coil (static ring) of the load current I, which is equivalent to a power table, so that the mobility part is subject to the power UICOS φ and the deflection angle of the power UICOS φ and the deflection angle.The multiplication of sine sinα is proportional to the torque M1, M1 = K1UICOS φSinα.K1 is a coefficient, cos a cartoon is the load power factor.The dynamic ring 2 and the inductors L (or capacitor C) are connected in series with a power supply voltage U, and combined with the static ring, which is equivalent to a powerless power table.
How to connect the power factor table
When the pointer power factor table is designed, when the voltage of A, B and the C -phase current, and the power factor is equal to 1, the pointer is designed in the middle (1) position.The power factor of the low -voltage power supply network is basically lagging.Few is equal to 1.(When the network load is explicitly, it will be advanced. The pointer of the table should be in the middle, referring to the position of 1. The normal power supply network, the power factor table is rarely in the position of the point 1.)

Related tags： Machinery