Dense fog on early Thursday morning led to power outages across the Capital as transmission lines tripped. As visibility fell below 50 metres,dust and pollutant deposits accumulated on several 220-KV transmission lines leading to faults.
Areas in South,East and Northwest Delhi suffered outages for hours,starting 1 am on Thursday. Supply could be restored only by noon,despite efforts by Delhi Transco.
The major areas affected by power cuts include Gopalpur,Subzi Mandi,Kanjhanwala,Bawana,Mahipalpur,Geeta Colony,Mehrauli,Patparganj,Shalimar Bagh,Rohini and adjoining areas.
Officials said tripping due to heavy fog is beyond the control of the distribution companies (discoms) and little can be done to restore supply,other than constant attempts to to energise the lines through manual operations.
The restoration of power supply was done in a phased manner and was successfully completed by 12 noon as weather conditions improved. The total load affected due to tripping was 600 MW, said Rishi Raj,Delhi Transco spokesperson.
The peak load during the last 24 hours was 3,265 MW,he said.
According to Delhi Transco officials,porcelain insulators have been replaced with silicon polymer insulators on all 400 KV lines. This initiative has yielded favourable results and there has been no tripping in 400-KV network due to fog this winter. We also plan to replace porcelain insulators on 220 KV lines in a phased manner. We also regularly wash all the lines to clean the dust,pollutants and other deposits to minimise the effect of fog, Raj said.
So far,Delhi Transco washed 220 KV network in November and December and the second phase of washing is going on,officials said.