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Transformer overloading occurs when the electrical load connected to a transformer exceeds its designed capacity. This situation can lead to several detrimental effects on both the transformer and the overall power system. 

Causes of Transformer Overloading

1. Increased Demand: As the demand for electricity grows in an area, transformers may become overloaded if they are not upgraded or replaced to accommodate the higher load.

2. Inadequate Sizing: If a transformer is undersized from the beginning, it might struggle to handle the intended load, leading to frequent overloads.

3. Faulty Load Distribution: Uneven distribution of loads across multiple transformers can cause some to be overloaded while others operate below their capacity.

4. Failure of Parallel Transformers: In systems with parallel transformers sharing a load, the failure of one unit can shift the entire load onto the remaining transformers, potentially overloading them.

5. Temporary Peak Loads: Seasonal variations or temporary events (e.g., holidays, special events) can create sudden spikes in electricity demand, overwhelming the transformer's capacity.