The efficiency of the Electrical Transformer
What is the Efficiency of Electrical Transformers? 
The transformer is a static device that is the most efficient machine in the category of electrical machines. The Efficiency range is between 9599%. The Best method to find the losses in the transformer is first we calculate all losses and then Find the Efficiency of the transformer.
The Efficiency depends on Losses that occur in the transformer. There are different types of losses occurring in the transformer that depend on the loaded and unloaded conditions of the transformer.
There are two types of tests are used in the transformer to check the core losses and winding losses. These tests are the open circuit test(OC) and the Short circuit test (SC). The core losses are calculated in the OC test because it depends on the voltage. The copper loss is calculated in the Sc test because it depends on the current. The efficiency of a transformer is defined as the ratio of output power to input power Is called the efficiency of the transformer.
How can calculate Transformer efficiency?
Condition For Max Efficiency

Output Current at which max efficiency appears

All Day Efficiency
The Efficiency of a transformer is defined as
Efficiency =Output(In Watt)/Input(In Watt)
The AllDay Efficiency is also called Operational Efficiency. There are some types of transformer available That efficiency and performance cannot be found using the upper defined formula, This type of transformer is called a Distribution Transformer. The primary of a distribution transformer is 24 hr Energise and their secondary winding is some time for noload in 24hr. In a Distribution Transformer core, loss appears at all times and copper loss is dependent on the load time. To calculate the distribution transformer we need all day efficiency method, In this method, we calculate Energy at a specific time. The formula to calculate the allday efficiency is
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