A three-phase transformer is used as a step up and step down for Ac voltage in various stages of a power system. Here this post gives the advantages and disadvantages of 3 phases transformed to better understand this topic.
Advantages of three phase transformer:
- It is lighter and smaller.
- High efficiency.
- It occupies less floor space for equal rating.
- It requires a few bushing.
- Less transformer oil is used.
- Less external wiring.
- Less material for the same three-phase power ad voltage rating
- Low cost compared with three units of single-phase transformer.
- Transportation is easy and also the transportation cost is less.
- Bus bar structure and switcher installation for a single three-phase unit are simpler.
- Being prewired and ready to install these can be easier to install.
- To provide the same KVA the core material required is very less compared to a bank of three single-phase transformer.
- Only three-terminal is required to be brought out in the case of a three-phase transformer.
- It requires 1/3 as much iron for the magnetic circuit as compared to a bank of three 1 phase transformer.
Disadvantages of three-phase transformer:
- If the failure of only one phase puts the entire transformer out of service.
- Great cost study unit.
- Additional cost and inconvenience of repair, so cost is more.
- To restore the service, the spare unit cost is more compared with one single phase transformer.
- When some of the case these are self-cooled, so the capacity of the transformer is reduced.
Explore more information: