KUCHING, July 18 (Bernama) -- The power blackout that affected most parts of
Kuching city this afternoon was caused by a transmission fault at Mambong near
here when one of the two 275 kv transmission lines tripped unexpectedly, Sarawak
Energy Berhad (SEB)’s Grid System Operator, Mr Yong Ying Poh said today.
He said SEB had started investigations to find the underlying cause of
today''s incident which occurred when one of the lines connecting Engkilili to
Mambong was taken out of service at 11.47am for urgent replacement of a failed
capacitor voltage transformer and the remaining circuit tripped unexpectedly at
2.12pm due to a line fault.
“SEB acknowledges the community’s understandable frustration as a result of
today’s event and deeply regret the inconvenience and disruption caused to our
consumers in Kuching," he said in a statement here.
He said SEB''s maintenance crews were working to complete the replacement job
so that the other circuit can be back to service immediately, with full load
restored to all affected areas by 5pm.
Since the second line tripped, he said, the only source of supply to Kuching
was from the Sejingkat and Tun Abdul Rahman power stations, which do not have
sufficient capacity to meet demand in Kuching without support from elsewhere in
"To keep the system stable, it was therefore necessary to turn off supply
to some areas around Kuching for up to 45 minutes at a given time,” he said,
adding that information from its probe would be used to continue improving the
standard of reliability in Sarawak.