Power supply issue
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I would like to ask whether dual power supplies and dual circuits are the same thing in a power supply system?
Dual power supply: Two sources from different substations (or one power source and one generator)； Dual circuits: Two circuits come from the same substation but from different bus sections (sometimes, due to load shifting, the two bus sections may be connected in parallel) ； Dual power supplies generally cannot operate in parallel, while dual circuits have conditions under which they can be connected in parallel. When switching between dual power supplies, it is necessary to stop power first before restoring it; for dual circuits, they can be connected first and then disconnected (without an immediate power outage).
In areas where power outages can cause significant losses, dual power supply systems are used. Automatic switching devices ensure that if one power source fails, the other will automatically take over, thus preventing interruptions in power supply. The likelihood of both power sources failing at the same time is extremely low. Manual specifications include guidelines for load classification, which provide detailed explanations on this topic
Dual power supply: Comes from two separate power sources, often used in applications with high requirements； Generally, they cannot be used in parallel. Dual-circuit system: This is the mode commonly adopted in modern distribution rooms, where two busbars usually operate separately.
Are dual power supplies and dual circuits the same thing? For the incoming power supply to a substation, a dual-power supply refers to a situation where there are two separate power supply lines, and these two lines have the same voltage level; otherwise, it can only be referred to as two incoming power supplies. A dual-circuit system generally refers to a power supply arrangement in a substation where two transformers are connected through high-voltage switches or high-voltage isolating switches to provide power. However, a dual-circuit power supply does not necessarily require two separate power sources; on the other hand, two power sources can certainly be used to create a dual-circuit power supply system. I’m not sure if you can understand the description above
Thank you very much to everyone. If the two power supplies come from one generator but are in different substations, can it be considered dual power supply? Is it related to the voltage level? Is it a bit difficult to use dual power supplies in a given region?
I think if they come from different locations, it should be called dual power supplies; otherwise, as you said, it’s difficult in the same area, and one can only use either mains electricity or a generator.
You may refer to the \"Design Code for Power Supply and Distribution Systems.\" A dual-power supply refers to a power source that comes from two different substations, or from one substation along with a generator, or from one substation together with batteries, etc. A dual-circuit system refers to two power sources coming from different sections of a single substation. Primary loads must meet the requirement of dual power supply, while secondary loads must satisfy the requirement of dual circuit power supply.
Dual power supplies are generally divided into stage one and stage two; these stages can be powered by the same power source or by two separate power sources. A dual-circuit system consists of circuits formed by different busbars within the same substation
Dual power supplies are generally used in power plants or places with high safety requirements!
A dual-power supply generally has one incoming line from the mains, which feeds the main transformer, with a backup generator serving as the regular power source. A dual-circuit system can be simply understood as one that uses power from two different substations