Substation transformers are designed for installation in large or small three-phase transmission and distribution power systems. The installation location is common and must be on the indoor or outdoor concrete base, which needs to be designed by the power engineer in the early stage of project planning.
In addition, substation transformers are generally oil-immersed. Mineral oil, vegetable oil or siliceous transformer oil. Widely used in various utility or small industrial applications. Construction standards are generally based on IEC, IEEE or other international standards. If we talk about the voltage class of transformers in substations, the primary voltage of transformers in substations is usually a minimum of 2.4 kV and a maximum of 69 kV, which is based on the IEEE standard. The minimum capacity is 150KVA to the maximum 20MVA, and the secondary voltage can also be a minimum voltage of 0.6KV and a maximum voltage rating of 35KV.
| Substation Transformer Ratings | |||
| Standard | Ratings | Standard | Ratings |
| IEEE C57 | 500kVA | IEEE C57 | 3/4MVA |
| AS/NZS 60076 | 750kVA | IEEE C57 | 5MVA |
| AS/NZS 60076 | 1000kVA | CSA C88 | 5/6.667MVA |
| IEEE C57 | 1500kVA | ANSI C57 | 2500/3125kVA |
| CSA C88 | 1500/2000kVA | IEEE C57 | 4500/5200 kVA |
| IEEE C57 | 2000kVA | IEC60076 | 6300kVA |
| CSA C88 | 2500kVA | IEC60076 | 6800kVA |
| IEC/AS/NZS 60076 | 3000kVA | CSA C88 | 7500kVA |
| CSA | 3000/4000kVA | IEEE C57 | 10000kVA |
| IEEE C57 | 3000/3750kVA | IEEE C57 | 10000/12500kVA |
| IEEE C57 | 4000kVA | IEC60076 | 12000kVA |
substation power transformer
At the same time, substation transformers can be divided into public substation transformers and personal industrial substation transformers in terms of usage scenarios:
* Utility substation transformers:
In this case, it is used by industrial power distribution companies, and then the output voltage is eventually used by private individual consumers. Output both single-phase and three-phase AC current. Some commonly used ones are 120V, 240V, 400V, and so on. Use in urban or rural power distribution equipment. Then input to multiple or single small capacity low voltage power transformers. The transformers of urban substations are usually built with bricks to form a protective wall, and the transformers of rural substations generally appear on the outdoor poles and towers.
*Personal substation transformers
We understand that the substation transformer used by the end user is for the personal use of the end user. Generally, it is powered by grids with medium and low voltage levels, and is used in schools, hospitals, restaurants, etc.
*There is also an underground substation transformer
Sometimes due to space limitations, an underground substation transformer is specially designed to meet environmental requirements. It is only the special requirements of the underground that we need to pay attention to:
For installations with limited space, special media, and special oils need to be considered in terms of safety, and in terms of quality, the highest quality must be considered to minimize operational risks and economic benefits of machine operation.
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