One of the two power transformers in North Columbus Street substation in Pacific, Missouri, USA, failed recently leaving almost 3,000 customers without power.
Ameren’s SCADA system relay sensors showed this the following morning. The crews arrived on the site to test the transformer for faults and determined that the 30-year-old transformer had totally failed and could not be repaired. Electricity was rerouted to the other transformers in the city and a mobile transformer was also used at the site.
“We looked at our schedule and decided that we could replace the transformer with a new one overnight,” said Ben Lynch, Ameren substation engineer, who supervises the highly trained high-voltage substation crews assigned to oversee the transfer.
A 550-ton crane was brought to the site by Budrovich Crane Rental to lift out the old transformer and lift in a new one which costs $ 500,000. The 36,000 kg transformer was inched 20 m straight up, swung over the 15 m pole and live electric wires, and set down in the substation with inches to spare on two sides.
Crews worked throughout the night to install the new transformer which started supplying power approximately 30 hours after it had failed.