Tata Power Delhi Distribution Ltd on Monday said it has received a patent for self-regenerating transformer breather for 20 years.

The 'Self-Regenerating Breather' is a device protecting a transformer from moisture ingress and thus, increases the longevity of electric transformers, the company said in a statement.

According to the statement, Tata Power Delhi Distribution Ltd (Tata Power-DDL), a leading power utility supplying electricity to over 2 million customers in North Delhi, has been granted the patent for its unique self-regenerating transformer breather for a term of 20 years.