SINGAPORE: A main contractor of the Land Transport Authority will replace 150km of power cables and more than 100 circuit breaker components along the Tuas West Extension, after some faulty parts led to a disruption of train services on Oct 14.Advertisement
To facilitate the replacement of all the circuit breaker components, called trip coils, some MRT stations will close early from November. Work on this is expected to be completed by the end of the year.As for the new cables, LTA said they will take some time to arrive. The authority will therefore schedule early closures or late openings on weekends or full Sunday closures for “limited periods” next year to facilitate the replacement work.
When the circuit breaker did not function, LTA said a secondary protection mechanism kicked in and isolated a larger electrical sector as a precaution, cutting off power supply from a substation that serves a section of the North-South East-West line . “After 40 minutes into the disruption, SMRT assessed that the power supply for the NSEWL and CCL could not be restored quickly,” LTA said.
“De-trainment on the three affected trains along the CCL was safely completed within 20 minutes,” LTA said.“Due to inclement weather and lightning risk, de-trainment for the last NSEWL train near Bukit Batok station had to be suspended and was only completed at 9.43pm.” “Regular public announcements on service disruption were made to all stations and trains throughout the network,” it said.
“LTA treated this as a matter of significant concern and raised the issue with the main contractor Alstom in January 2020.” “The Tuas West Extension circuit breakers are of an established design and are widely used in the power industry,” it added.In light of the Oct 14 disruption, LTA said all the power cables and trip coils along the Tuas West Extension will be replaced to “provide additional assurance that power cable faults will not lead to another service disruption”.
I think likely due to thermal cycles from our unpredictable weather plus moisture, leading to thermally expanded sagging insulation. Then the faulty insulation touched live high voltage copper resulting in melt down. Insulation does not have consistent thermal expansion.
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