A step up transformer for solar power plant is used after the inverter side, when the voltage needs to rise before power enters the collection line or grid connection point. In a solar site, the load is not the same all day. Output rises with sunlight, drops with clouds, and changes again in the evening. Because of this, transformer selection should not only look at rated capacity. The design also needs to check temperature rise, loss data, oil or dry type structure, protection parts, and the space left for lifting and service.
For a small station, the transformer may be close to the inverter area. For a larger project, several transformer points may be placed across the plant. Each point should match cable length, site access, and local grid requirements. A clear drawing and factory test report help the site team avoid small mistakes during installation.