Five key considerations in the selection of inverter duty transformer for your solar power plant

Inverter duty transformers are an essential component of a solar power plant as they are responsible for transforming the DC voltage generated by solar panels into AC voltage that can be fed into the grid. The selection of an inverter duty transformer is critical to ensure the reliability and efficiency of the entire solar power plant. In this article, we will discuss five key considerations for selecting an inverter duty transformer for a solar power plant.

1. Capacity of Transformer: The capacity of the transformer should be chosen based on the maximum power output of the solar power plant. It is important to select a transformer with a capacity greater than the maximum power output to account for any potential future expansion of the power plant.
2. Voltage Ratings: The high voltage (HV) and low voltage (LV) ratings of the transformer should be selected based on the inverter output voltage and the grid voltage respectively. The HV rating should be compatible with the grid voltage, and the LV rating should match the inverter output voltage. It is also essential to ensure that the transformer is capable of withstanding the voltage fluctuations that may occur due to variations in solar irradiance.
3. Impedance: The impedance of the transformer should be selected based on the guidelines specified in the relevant IS codes. The impedance of the transformer plays a crucial role in limiting the short-circuit current during a fault and protecting the inverter from damage.
4. Cooling: The cooling method used in the transformer is critical in ensuring that the transformer operates within the specified temperature limits. The most common cooling method used in inverter duty transformers is ONAN (oil natural air natural) cooling. The transformer oil acts as a coolant, and the air surrounding the transformer provides the required cooling.
5. Efficiency: The efficiency of the transformer is an important consideration as it affects the overall efficiency of the solar power plant. It is recommended to select a transformer with a minimum efficiency of 98.5% to ensure that the losses in the transformer are minimized, resulting in higher energy yields.

In addition to the above factors, it is also important to consider other factors such as the type of transformer, vector group, tap changes, and type test reports while selecting an inverter duty transformer for a solar power plant. The transformer should be selected based on the specific requirements of the solar power plant and should be designed to operate reliably and efficiently under all operating conditions.

To conclude, the selection of an inverter duty transformer is a critical decision in the design and installation of a solar power plant. The transformer should be selected based on the maximum power output of the plant, voltage ratings, impedance, cooling method, and efficiency. By considering these factors, it is possible to select a transformer that is reliable, efficient, and meets the specific requirements of the solar power plant.