Why Power Factor Compensation Is Required in Low-Voltage Power Distribution

In modern low-voltage power distribution systems, with the continuous increase of various electrical equipment, power quality issues have become increasingly prominent. Among them, the "low power factor" has become a common phenomenon in many factories, commercial complexes and even public facilities. Although it seems to be merely an electrical parameter, it is directly related to enterprises' power consumption costs, equipment efficiency and the stability of the power supply system. Why is power factor compensation necessary in low-voltage power distribution?

 

I. Definition and Significance of Power Factor

Power Factor (abbreviated as PF) is a key indicator for measuring electric energy utilization efficiency. It is defined as the ratio of active power to apparent power:Power Factor = Active Power / Apparent Power

Its value ranges from 0 to 1; the closer it is to 1, the higher the electric energy utilization efficiency.

In actual low-voltage power distribution systems, a large number of inductive loads (such as motors, transformers, electric welders) consume reactive power, resulting in a reduced power factor. This means part of the current in the system does not perform actual work, yet increases the burden on lines and equipment.

 

II. Main Problems Caused by Low Power Factor

1.Increased electric energy loss

When the power factor is low, the system requires a larger current to meet the same active power demand. This leads to a significant increase in line loss (I²R loss), thus causing electric energy waste.

2.Reduced equipment utilization rate

The capacity of equipment such as transformers, switches and cables is designed according to apparent power. The lower the power factor, the more system capacity is occupied, which is equivalent to "occupying resources virtually" and reduces the actual utilization efficiency of equipment.

3.Degraded voltage quality

Large reactive current causes an increase in line voltage drop, leading to a drop in terminal voltage, affecting the normal operation of equipment, and even resulting in equipment malfunction or shutdown.

4.Penalties for power factor adjustment electricity charges

In most power supply policies, users will be charged reactive power penalties when their power factor is lower than the specified value (0.9 or 0.85), which directly increases enterprises' operating costs.

 

Jinneng electric Low voltage power factor controller,commonly referred to as a "reactive power compensation controller" or ",low-voltage automatic reactive power compensation controller" is the intelligent control core in low-voltage power distribution systems used for automatically switching capacitor banks on and off to improve the system's power factor.

 

Its fundamental purpose is to maintain the system's power factor at a set target value (typically between 0.95 and 1.0) by monitoring the grid's power factor in real time and automatically controlling the switching of capacitor banks.

● Reducing reactive power losses and saving on electricity costs

● Increasing the load capacity of transformers and lines.

● Stabilizing grid voltage and improving power quality.