What is high voltage electricity and what is low voltage electricity
Release time:
2024-06-25
Voltage levels are generally divided:
1, safety voltage (usually 36V or less).
2、Low voltage (also divided into 220V and 380V).
3、High voltage (10KV-220KV).
4、Extra-high voltage 330KV-750KV.
5、Extra-high voltage 1000KV AC, ± 800KV DC or more.
At present, China's commonly used voltage levels: 220V, 380V, 6.3kV, 10kV, 35kV, 110kV, 220kV, 330kV, 500kV, 1000kV. electric power system is generally composed of power plants, transmission lines, substations, distribution lines, and power equipment. Voltage lines above 35kV are usually referred to as transmission lines.
Extended information:
First, the rational allocation of the voltage level of the urban power grid
1, with the growth of the load.
Part of China's current use of the voltage level sequence of limited adaptability.
It is necessary to adopt a new voltage level sequence. Voltage level configuration of the implementation of the program needs to be based on the city's specific conditions for in-depth feasibility studies.
2, for the final load density is higher in the region, the
Consideration can be given to the gradual transition to higher medium-voltage distribution voltage. For areas with lower final load density and longer power supply distances, a higher MV distribution voltage can also be considered.
Higher medium-voltage distribution voltage can also be considered.
3. In order to avoid affecting the reliability of power supply in the process of introducing new voltage level, it is possible to adopt the method of installing contact transformer.
Contact transformers can be installed to enable the parallel operation of power grids of different distribution voltage levels.
4. For the areas where the new voltage level sequence is adopted, the internationally recognized method of gradual encroachment can be adopted.
can adopt the internationally recognized method of gradual encroachment.
After a number of years of gradual transition, the
Formation of the target voltage level sequence mode.
Second, voltage classification
Voltage can be divided into high voltage, low voltage and safety voltage.
The difference between high and low voltage is: based on the voltage value of electrical equipment to ground. A voltage greater than or equal to 1000 volts to ground is considered high voltage. The voltage to ground is less than 1000 volts for low voltage.
One of the safety voltage refers to the human body for a longer period of time without the risk of electric shock voltage.
According to the national standard "GB3805-83" safety voltage provides for the prevention of electrocution accidents and adopted by the specific power supply voltage series. Our country stipulates the following five levels of industrial frequency safety voltage, namely 42V, 36V, 24V, 12V and 6V.
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