Electrical Power Distribution Design: Low and High Voltage

What is power distribution?

Distribution is a part of the power system that converts high-voltage electrical energy from the power supply company into low-voltage electrical energy suitable for homes, businesses and other places of use. There are usually multiple links in this process, including transformers, low-voltage lines and switchboards.

The significance of distribution design

1. Improve the economy of the power system

The economy of distribution design is to reduce the construction, operation and maintenance costs as much as possible under the premise of meeting the power supply requirements. Distribution  design can achieve the best economy of power system and improve the benefit of power system through reasonable structure design and parameter selection.

2. Ensure the safety of the power system

The safety of distribution design is to ensure the safety and reliability of the power system under the normal operation of the power system. Distribution design can improve the carrying capacity of the power system, reduce the short-circuit failure rate of the power system and ensure the safety and reliability of the power system through reasonable structural design and parameter selection.

3. Ensure the reliability of the power system

The reliability of distribution design is to ensure the continuous power supply capacity of the power system under the normal operation of the power system. Distribution design can improve the reliability of the power system, reduce the outage rate of the power system and ensure the continuous power supply capacity of the power system through reasonable structure design and parameter selection.

4. Meet specific needs ‌

In a specific scenario, such as fire power distribution design, the importance of power distribution design is particularly prominent. Fire power distribution design needs to ensure the continuous supply of fire power under fire conditions to ensure the normal operation of fire equipment, so as to ensure the safety of personnel and property ‌.

5.‌ Improve the equipment utilization rate ‌

In power plant power supply and distribution system, reasonable electrical design can improve the utilization rate of equipment, avoid waste phenomenon, improve the efficiency of power plant ‌.

6.‌ Energy conservation and emission reduction ‌

After the implementation of energy saving measures for power supply and distribution systems, it is of great significance in protecting the environment, reducing carbon emissions and saving energy ‌.

Definition and characteristics of low voltage distribution and high voltage distribution

Low-voltage distribution refers to the part of the power system where the voltage at the supply end is lower than 0.4 kV, while high-voltage distribution refers to the part where the voltage is higher than 0.4 kV. In low-voltage distribution, the electric energy is mainly transmitted from the power station to the user through the transformer, distribution transformer and other equipment, which  supplies household, commercial and industrial power facilities; High-voltage distribution refers to the transmission of electrical energy at a voltage higher than 0.4 kV, which is often used in the transmission link of the power system. Although both are modes of power transmission, due to the difference in voltage, their application range and use are different.

The difference between low voltage distribution and high voltage distribution

‌The main differences between low-voltage and high-voltage power distribution are voltage levels and application scenarios. ‌

The voltage level of low-voltage distribution is usually below 1000V, while the voltage level of high-voltage distribution is above 1000V. The low-voltage distribution system consists of distribution substation, high-voltage distribution line, distribution transformer, low-voltage distribution line and corresponding control and protection equipment. These devices include low-voltage circuit breakers, fuses, etc., which are used to protect circuits and equipment from overload and short circuits. ‌

High-voltage distribution is mainly used to transmit and distribute high-voltage power, which usually involves higher voltage levels and more complex protection measures. High-voltage distribution lines are usually used to transport electricity from power plants to substations, and then depressurized by transformers to supply low-voltage distribution systems. ‌