POWER DISTRIBUTION TRANSFORMER
& ITS FAILURE
The Distribution Transformer is the last major equipment in the power supply chain and is supposed to work at all times to ensure continuous power supply to consumers. The Failure of a transformer disrupts power supply to all the consumers fed by it and results in inconvenience to consumers . Year after year thousands of transformers burnout, the repair cost which will sum up to large sums of money. Even after
repairs when back in service they are re-exposed to work under same conditions risking repeated
failures. Owners of distribution Transformers incurr huge cost of repair and loss of revenue for the period of outages in addition to loss of reputation. On the other hand consumers are greatly inconvenienced during the period of outages.
Causes for the Failure of Distribution Transformer :
The Excessive rise in the operating temperature is the main cause for transformer failure. Various
Standards Such as IEC, BIS, and BS have Specified the operating Characteristics for transformers.
These are known as “Thermal characteristics” and are typically specified for both hot and cold working conditions of the transformers. The Thermal Time constant which determines the time required to rise the temperature of the transformer depends on its size, weight and rating.
The Loading of the distribution transformer varies from light load to overload. The duration of over load may be continuous or cyclic. Again the loading pattern also varies during the time of the day, season of the year and nature of the load. Continuous changes in the internal temperature of the transformer will result in thermal stress on the internal insulation leading to progressive degradation of its property.
Excessive operating temperature for extended duration will lead to burn out of insulation resulting in
Avoids Transformer failures and improve transformer management :
To Avoid distribution transformer burn-out, it is necessary to ensure its efficient and safe working
at all times. The patented design of SMARTCON™–DT ensures that various causes that are
determinental to the safe working of the transformers are adequately addressed to guarantee, years
of trouble free performance of distribution transformers. SMARTCON™–DT also enables excellent
management and control by measuring, Storing & Communicating various performance parameters
of the distribution transformers.