New Delhi: Power distribution companies operating in Delhi are relying on advanced technology transformers to ensure uninterrupted supply of power, with the maximum demand standing at around 8,000 MW amid the scorching heat in the city.

The transformers used by BSES are designed to operate at 40 degrees above ambient (field) temperature, a company spokesperson said.

He said, "Basically this means that the transformers can operate at a temperature 40 degrees higher than the prevailing area temperature. For example, if the area temperature is 4 degrees Celsius, they can operate at 88 degrees Celsius without any external assistance. Can work up to Celsius."

BSES discoms (distribution companies) – BSES Rajdhani Power Limited (BRPL) and BSES Yamuna Power Limited (BYPL) – supply electricity to most parts of the city except North Delhi."Due to modern design and technology, no external AI like fan is required to cool the transformer," a BSES spokesperson said.

Extreme temperatures cause power outages for hours due to transformers overheating and burning.

The BSES spokesperson said that in some extreme cases, if the temperature of the transformer exceeds 88 degrees Celsius, an external cooling fan is used to bring the temperature within the permissible limits.

Tata Power Delhi Distribution Limited (TPDDL), the discom that supplies power to North Delhi, operates 88 grid substations at 66-kV and 33-k levels with 222 transformers, all controlled by centralized supervisory control and data acquisition (SCADA). The system is monitored and controlled remotely. , the company spokesperson said.“With the mercury rising to extremes this summer, maintaining the optimum performance of our power transformers is vital to ensure their effective functioning,” he said.

Delhi recorded its highest ever power demand of 8,302 MW on Wednesday as the city recorded a maximum temperature of 46.8 degrees, the highest in 7 years.

The maximum temperature on Thursday was 45.6 degrees Celsius and the maximum power demand at 3:28 pm was 8,091 MW. The Meteorological Department has predicted the maximum temperature to be 44 degrees Celsius on Friday.

The spokesperson said that TPDDL transformers are carefully designed for the different weather and environmental conditions of Delhi.He said, the transformers are equipped with “Oil Natural Air Natural” (ONAN), “Oil Natural Air Forced” (ONAF) cooling system which keeps their temperatures within permissible limits during summers.

An automatic cooling system activates or deactivates the cooling fans or OI pumps depending on the transformer oil temperature and winding temperature.

He said, remote monitoring through SCADA system can keep a close eye on oil and winding temperature indicators.

Additionally, there is also a provision of industrial blower, strategic load shifting and sharing between transformers to avoid the problem of overheating.

TPDDL spokesperson said online monitoring including thermos-scanning and ultrasonic testing ensures that the transformers are in peak condition even during peak demand times.