What is the difference between dual power supply and dual circuit power supply
Let's first understand dual power sources and dual circuits by definition:
1. Dual power supply: A device controlled by a microprocessor for switching between grid power and grid power or grid power and generator power in a power grid system, which can provide continuous power supply. Two power sources come from different substations (or one power source and one generator).
2. Dual circuit: A circuit where a load has two power sources. The two power sources come from the same substation and have different sections of busbars (sometimes due to reverse load, the two busbars may be parallel).
Firstly, according to GB50052-2009, the current standard for dual power supply is called dual power supply: the power supply of a load is provided by two circuits, which are independent of each other in terms of safe power supply.
Secondly, the dual power supply should be the substation of the power industry, rather than the internal substation of the project (considering the overall load of the project).
Again, the transformer of the power supply must be led from different bus sections. In some areas, there are two transformers in substations, but both transformers are connected by a single busbar or segmented single busbar connection method, which cannot be treated as dual power sources.
Therefore, a dual power supply should be a power supply composed of different bus segments connected to one power supply from an electrical substation.
And there is no such requirement for dual circuits. Two circuits or loop networks distributed by one transformer, and two power sources distributed by two transformers on the same bus section can both be considered as dual circuits. Dual circuit power supply can only ensure the power supply needs of secondary and below loads.
The dual power supply method involves two independent substations bringing in two power sources, or one power source each from the two busbars of two transformers in one substation. This ensures the independence of each power source, and when one power source loses power due to a fault, the other power source can also ensure reliable power supply to the building. The power supply method of dual circuit power supply can be dual power supply or single power supply dual circuit power supply. When a single power supply and dual circuit power supply are used, the entire building's power supply will be interrupted when the power supply or bus fails.
In summary, combined with the usage experience of domestic electricity loads. Double circuit is mainly used for secondary loads with high electricity requirements, such as hospitals, banks, and other departments. When designing the circuit, two circuit power supply is often used. In the event of a failure in one power supply, the other power supply effectively ensures the continuity and reliability of electricity consumption. From this, it can be seen that there is only one power supply for the dual circuit, while the dual power supply is two independent power sources that switch to the other power supply in case of line failure or demand. Dual power supply is mainly used for higher demand primary loads.
