ECONOMYNEXT – Sri Lanka was hit by a cascading power failure shortly after 1130hours on Friday, with the grid down around the island.
A Ceylon Electricity Board official said and efforts were underway to re-energize the grid.
The blackout is suspected to have been triggered by the failure of a 220kV transmission line that brings power from the Mahaweli hydro-generation system running from Kotmale to Biyagama in the capital Colombo, he said.
Earlier in the week failed tripping large parts of the grid in the night.
Sri Lanka has a high level of hydro generation at the moment due to heavy rains. Small hydro plants, which cannot be dispatched centrally also run at peak levels sometimes making grids unstable.
When a section of the grid fails, the imbalance is frequency can result in automatic tripping of generators and other parts of the grid in a so-called cascading failure.
Sri Lanka last suffered a cascading failure in August 17, 2020.
Cascading failures can take many hours to fix, particularly if restored parts of the grid fails again. Large coal plants also blow diaphrams in emergency shutdown which can take days to fix.
The failure comes as power engineers warned of blackouts after 4.15pm after a senior official in the transmission unit was sent on compulsory leave. (Colombo/Dec03/2021)