Power efficiency and all day efficiency of a transformer

Power efficiency and all day efficiency of transformer

The definition of Power efficiency and all day efficiency of a transformer is as given below

Definition:

Power efficiency is defined as the ratio of Output power to the Input power. Mathematically, it is represented as

All day efficiency is defined as the ratio of Output energy to the Input energy calculated over 24 hours. Mathematically, it is represented as

Q) Now, the question is why two efficiencies are required for the transformer?

Let us first know about the types of transformers based on the location. They are as listed below:

Power transformer.
Distribution transformer.

Power transformers are located on the sending end/generating end side of power system whereas the distribution transformer are located on recieving end/load end side.

What is the need of Power efficiency?

The power system is an interconnected network and the power transformer is located on the sending end side of the system. Hence, the power transformer is always connected to the load. Thus, the iron/core losses and copper losses occurs throughout the day and due to this reason the "Power efficiency" is calculated for power transformer.

What is the need of All day efficiency?

For some transformers, the load is fluctuating throughout the day. Hence, the efficiency of such transformers cannot be judged by calculating "Power efficiency" because the iron/core losses takes place throughout the day but the copper losses takes place only when the load is connected.

In such cases, to know the efficiency of transformer we used to calculate "All day efficiency".

For example: The distribution transformers are energized for whole 24 hours a day but they are not loaded for 24 hours. Hence, iron/core losses takes place throughout the day but the copper losses occurs only during loaded condition. Hence, while calculating efficiency for the distribution transformer, we take time into account during which the power is delivered.

So, we can say (Energy efficiency for 24 hours)=(All day efficiency).

I hope you have got some good and relevant information from this blog.

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