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SINGAPORE: All trip coils for circuit breakers along the Western Tuas Extension have been replaced, the Land Transportation Authority (LTA) said on Thursday (December 17).
As a preventive measure against power cable failures and potential service interruptions, LTA announced last month that all 113 trip coils would be replaced by the end of 2020. Trip coils are components of circuit breakers that function to isolate faults. of energy.
Plans for the replacement were announced after more than 120,000 commuters were affected by a three-line MRT outage on October 14. LTA said in a post-incident report that the outage was caused by the “occurrence of concurrent faults,” beginning with a fault. power cord at Tuas West Extension.
On Thursday, the LTA said early closings carried out last month along the Tuas West Extension helped speed up the completion of the travel coil replacement program.
The change of the 22 kV circuit breaker tripping coils was performed by LTA, its main contractor Alstom, and SMRT.
READ: Timeline: How a power failure caused an hour-long outage on three MRT lines on October 14
As part of the precautionary measures, around 150 km of 22 kV power cables will also be replaced along the Western Tuas Extension.
The new batch of “higher specification cables” is expected to roll in from the middle of this month, LTA said.
Replacement works will begin in January, beginning with the section along the Tuas Depot entrance and the Tuas Link station.
Works will be carried out during normal engineering hours at the start. To speed up cable replacement work, LTA and SMRT will schedule early closings and late openings on weekends or full closings on Sundays along the Tuas West Extension from March to May.
The cable replacements are expected to be completed by the end of next year.
LTA said members of the public will receive advance notice of scheduled early shutdown dates and affected stations.
