What do primary load and secondary load mean?

The interruption of power supply caused by the first-class load will cause personal casualties and cause political and economic problems. Power load that causes great economic losses. ?

2. Secondary load. ?

The secondary load will cause serious equipment damage, a large number of products will be scrapped, the continuous production process will be disrupted, and it will take a long time to recover, thus causing huge political and economic losses. ?

3. Three-stage load. ?

General load that does not belong to primary and secondary load. That is, the three-level load.

Among the above three types of loads, one type of load should generally be powered by two independent power sources, one of which is a standby power source. ?

Classification of power load: according to the importance of power load and the degree of political and economic loss or influence caused by power interruption, it is divided into primary load, secondary load and tertiary load. ?

Fire resistance rating of buildings: according to the combustion performance and fire resistance limit of building components, it is divided into one, two, three and four fire resistance ratings. ?

Classification of fire risk of buildings: According to the fire risk of buildings, it is divided into five categories: A, B, C, D and E. ?

Obviously, there is no necessary relationship between the fire resistance rating of buildings and the fire risk classification of buildings.

Buildings are determined by the highest load level among them. That is to say, there is a first-class load in the building, and the power supply of the load is obtained from the power distribution system of the building (that is, the special line power supply of the power system), so the building is also a load. ?

Of course, there may be first-class equipment in a building with secondary load. Only the main load is sent separately. Otherwise, the building should be regarded as a first-class load.

References:

Baidu Encyclopedia-Power Load