The design of power supply and distribution system should reasonably determine the load level and capacity. The operating energy consumption of the system should be analyzed and corresponding energy-saving measures should be taken. For systems with large load changes, corresponding energy-saving operation modes should be adopted according to different working conditions.
The distribution room and floor distribution room of power supply and distribution system should be located in the load center as far as possible, and the power supply radius of the system should be controlled reasonably to improve the system efficiency and reduce the line loss.
For the power supply and distribution system with unbalanced three-phase or single-phase distribution, automatic split-phase capacitor compensation or automatic split-phase reactive power compensation device should be adopted.
The power supply system should be monitored for harmonics.
When the harmonics of the power supply and distribution system or equipment exceed the harmonic limit specified by the relevant national or local standards, measures shall be taken to suppress and control the higher harmonics of the main electrical and electronic equipment in the building or line where it is located, and the following requirements shall be met:
1) When the system harmonics or equipment harmonics exceed the harmonic limit, it is advisable to analyze the properties of harmonic sources and the measured parameters of harmonics, and take targeted harmonic suppression and harmonic control measures.
2) In the power supply and distribution system, filter devices should be set up where harmonic interference and reactive power compensation are large.
10kV and below power cable section size should be selected according to technical conditions and economic current.
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