Under what conditions should dual power supply be used, and under what conditions should single power supply and dual busbar operation be used?

Depending on the conditions and load conditions, if you have only one power supply near a Gobi Desert, even if you have a primary load, there is no way to provide dual-circuit power supply. Just kidding, single-circuit power supply can be used for primary and secondary loads, or loads that will not cause major losses or dangers due to power outages. For single-circuit double busbars, usually another section of the busbar has a certain load or the second section of load is prepared in the future. Temporarily considering the cost, only a transformer or loop can be used for single-circuit double-busbar power supply.

Single power supply plus double busbars. . What is the use of double busbar?

This post was last edited by zhaohh3211 on 2010-7-7 09:25. Factory power load levels are divided into first-level load, second-level load and third-level load. The power supply requirements of the first-level load: Two power supplies are required. When one power supply fails, the other power supply should not be damaged at the same time. In addition, for particularly important loads in the first-level load, in addition to the above two power supplies, an emergency power supply must be added. In order to ensure power supply for important loads, it is strictly prohibited to connect other loads to the emergency power supply system. Commonly used emergency power sources include generator sets that are independent of normal power sources, special feed lines in the power supply network that are independent of normal power sources, batteries, and dry batteries. Secondary load requirements for power supply: Secondary loads are also important loads and require power supply from two circuits. There are also two power supply transformers, but they are not necessarily in the same substation. When one of the circuits or transformers fails, the secondary load will not interrupt the power supply, or the power supply can be restored immediately after the interruption. Only when the load is small or the local power supply conditions are difficult, the power can be supplied by a dedicated overhead line with a primary circuit of 6KV or above. If cable power supply is used, two cables must be used in parallel to supply power, and each cable should be able to withstand all secondary loads. Level 3 loads have no special requirements for power supply. Single power supply double busbar (including double busbar segmentation) wiring has the advantages of reliable power supply, convenient maintenance, flexible scheduling and easy expansion. However, this wiring method uses a lot of equipment (especially isolating switches), the power distribution device is complex, and the economy is poor. During operation, the isolating switch, as an operating electrical appliance, is prone to misoperation, especially when the bus system fails and a large number of power supplies and circuits must be cut off in a short time. This power supply method uses a single power supply due to limited local power supply conditions. In order to reduce the impact of the failure of subordinate equipment on the power supply, a double busbar operation method is used to compensate. ； The second is to prepare for future expansion.