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What is the Efficiency of Electrical transformer ? Condition For Max Efficiency -Electronicsinfos

The efficiency of the Electrical Transformer

    Efficiency of 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 95-99%. 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?

    Efficiency η = output power/input power
    Efficiency η =output power/output power+losses 
    Efficiency η =Output/output+Cu loss+Iron loss
    Efficiency η =input-Losses/input = 1-losses/input

    Condition For Max Efficiency

    We know that

    Copper loss = Wc = I²R , I²R²
    Iron loss =Eddy current loss +hysterises loss 
    Wi= Wb+Wc
    Let's assume the primary side
    Primary input = VI cos
    Efficiency = Input-losses/input 
    Efficiency =VIcosΦ-I²R -Wi/VIcosΦ

    max efficiency condition
    What is the Efficiency of Electrical Transformers? 

    Output Current at which max efficiency appears

    What is the Efficiency of Electrical Transformers? 

    All Day Efficiency 

    The Efficiency of a transformer is defined as 

    Efficiency =Output(In Watt)/Input(In Watt)

    The All-Day 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 no-load 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 all-day efficiency is 

    All day Efficiency = Output (In KWH)/Input(In KWH)

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