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What is the difference between a two-winding transformer and a three-winding transformer?
1. Three-phase transformer, compared with single-phase or multi-phase transformer. Three-phase transformer is the most economical as a power transmission equipment. Because the three-phase coil can share a core (ignoring the advantages of other generators, receivers, etc.). Three coils form a transformer, and the material utilization rate is high. Of course, in extra-large transformers, due to transportation reasons, three single-phase transformers are also used to form a three-phase group transformer. Multi-phase transformers are often used in rectifier transformers to increase the number of rectifier phases and improve rectification quality and efficiency.
2. Usually two-coil transformers, such as distribution transformers, ordinary power transformers, etc. When a substation (in many cases, a step-down substation or an intermediate substation) is responsible for transmitting electric energy on the one hand, and on the other hand, it has to solve local electricity consumption. Then a three-coil transformer will be used. High voltage input, low voltage has two outputs. For low voltage, to solve local electricity consumption, the power supply radius can be small, so 35kV or 10kV is used. The structure is often half capacity (of course there are full capacity). And for long-distance transmission, such as 110 or 220kV voltage is used. Capacity is often full capacity (100%).
3. There is also a split transformer, which also has two sets of outputs.
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