1. The important role of factory power supply in industrial production: Modern society is based on the application of electric energy, and the proportion of electric energy in product cost is generally very small (except electrochemical industries). Its importance lies in that after the electrification of industrial production, it can increase output, improve product quality and labor productivity, reduce production costs and reduce the labor intensity of workers.
If the power supply of the factory is suddenly interrupted, it may have serious consequences for industrial production. For example, some factories that require high reliability of power supply, even if the power outage time is extremely short, will cause major equipment damage, or a large number of products will be scrapped, and even major personal accidents will occur, which will bring huge economic and even political losses to the country and people.
Basic requirements:
1. Safety: Personal accidents and equipment accidents should not occur in the supply, distribution and use of electric energy.
2. Reliability: The requirements of power users for power supply reliability should be met, that is, continuous power supply.
3. High quality: it should meet the requirements of power users for voltage, frequency and other quality.
4. Economy: the power supply system has low investment and low operating cost, and the consumption of non-ferrous metals is reduced as much as possible.
Scope of power supply system:
Factory power supply system refers to the circuit system from the power supply line to the incoming terminal of high and low voltage electrical equipment. Including all high and low voltage power supply lines in substations and factories. The task of substation is to receive and distribute electric energy without changing voltage; The task of substation is to receive electric energy, convert voltage and distribute electric energy.
High-voltage direct distribution goes deep into the load center, which can save a primary intermediate transformer, simplify the wiring of power supply system, save investment and non-ferrous metals, reduce power loss and voltage loss, and improve power supply quality. However, it depends on whether the environmental conditions of the factory meet the requirements of "safe corridor" for 35kV overhead lines to penetrate into the load center, otherwise it is not suitable.