There are two ways to accomplish three-phase transformations. One of them is to use a single three-phase transformer and the other is to use three single-phase transformers. A three phases transformer would have single devices with all windings constructed attached to it. However, if three-single phase transformers are used, then they have to be connected externally to form a three-phase bank. Manufacturers in India are capable of manufacturing both. The distribution transformer price in India is also very low as compared to other countries. And the quality of transformers that are manufactured in India, without a speck of doubt, is world-class. Manufacturers in India are the best when it comes to transformers and their supply.
India is one of the best manufacturers of the power distribution transformer. The distribution transformer price in India is also very less. A list of distribution transformer can be easily made available. And India is also one of the leading 5000 kva distribution transformer suppliers.
Three-phase device and single-phase device; which is better?
The more cost-effective way to three-phase transformations is by using a single three-phase device however, the single-phase option would be more ideal as it is not only more reliable but it is also more easy to maintain. So, from the point of view of versatility, it is undoubtedly a better and more attractive option. The single-phase option also comes in handy when several identical transformers are required at a single location. Also, in the event of failure, the single-phase option comes in handy as it is more friendly on the pocket to get a single unit at the time of an outage. As the loss of a transformer for a long period can have several severe impacts, this practice is pretty common with critical auto transformer banks and generator set-up transformers.
Polarities
The winding polarities are to be carefully observed while three single-phase transformers are used to form a three-phase bank. By using a dot convention, polarity can be indicated. Current owing into a dot on the primary winding induces a current owing out of the dot on the subsequent secondary winding. The polarities can be of two kinds; additive or subtractive. The type of polarities depends on the way the windings are connected to each other.
Delta and Wye
Delta and wye are two universally used three-phase winding configurations. A delta configuration is different from a wye configuration in many ways. First of all, all the three windings are connected end to end in a delta configuration which forms a closed path and a phase is connected to each corner of the delta. Usually, the delta windings are operated ungrounded. However, if required, a corner of the delta can be grounded or its leg can be center-tapped and grounded. In the case of a wye configuration to form a neutral, one end of each of the three windings is connected and to the other end three windings a phase would be connected. Usually, the neutral is grounded in a wye configuration.
Types of configurations
Mentioned below are the types of transformers that utilize delta and wye connections:
- Delta-Delta
This type of transformer is usually used to supply three-phase loads which are motor loads, that may have a single-phase component that is smaller. And single phases component is most often low voltage power and lighting.
- Wye-Wye
This type of transformer can serve both kinds of load; single-phase and three-phase.
- Delta-Wye
This is the universally used three phase transformer connection as it is the best when it comes to balancing heavy loads. It also helps in preventing voltage oscillation. The problem with this kind of configuration is that the entire bank may become inoperative if one of the single phases fails.
- Wye-Delta
This kind of transformer is used to provide a neutral on a three-wire system. However, it can also serve load on its secondary.
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