Calculation of capacity for engineering distribution transformers
Thread Content
Dear colleagues in the offshore oil industry, we have a project that requires the installation of 2 external 10/0.4KV distribution transformers, with a total installed capacity of 2240 KW and an operating capacity of 1872 KW. How should we calculate the capacity of these transformers? Could anyone with expertise provide an example to illustrate this? Thank you in advance! ! I found online that the capacity of a transformer is generally calculated based on its load factor, using a value of 70%~85% (70% is used here). For example, if the total rated power is 255 KW and the power factor is 0.95, then 255 x 0.95 = 244 KW. The capacity of the transformer required would be 244/0.7 = 348.6 kVA. Therefore, a 400 kVA transformer could be chosen. I wonder if this calculation method is reliable; I would appreciate some guidance from those with more experience.
The maximum operating load for dry-type transformers should not exceed 70% of their rated capacity, while for oil-type transformers it should not exceed 120% of the rated capacity. In other words, oil-type transformers can operate at a load 20% higher than their rated value, but the total load must not exceed 120%.
First, calculate the required power by multiplying the total power by a suitable coefficient; this coefficient is determined based on whether the electrical equipment in the workshop operates continuously or intermittently, or it can be estimated empirically. The transformer capacity is then equal to the calculated power divided by the power factor (0.9) and the transformer load factor (0.8), resulting in *** KVA
Thank you all for your thorough and professional explanations! !