Transformer Arrives!
Dan Carlin
The Arizona Republic
Aug. 1, 2004 12:00 AM
The 21-day journey of a 190-ton transformer ended around 2 a.m. today, as a long-awaited caravan pulled into the APS Westwing substation near Peoria.
A tractor lugged the 282-foot rig onto the gravel and dirt road leading to the substation off Loop 303 a few hours ahead of schedule and carried it by moonlight through the last 400 yards of an epic voyage that crossed three states.
In all, the huge device, which was shipped in to replace a transformer damaged in a July 4 fire, traveled nearly 2,000 miles.
It was first hauled by boat from Tacoma, Washington to Long Beach, California, then transferred to a 282-foot suspension rig, and finally pulled by a tractor across California and Arizona.
"The Arizona leg of the trip went as well as we could have planned," said APS spokesman Damon Gross. "We didn't expect the transformer to arrive until 5 or 6 a.m. today, but flat, level roads sped up the moving process."
The small jump on the schedule was welcome news for APS and its Valley customers, after a series of delays and mishaps postponed the arrival of the much-needed machinery.
Last Saturday, the transformer slipped off of its trailer and crashed onto a highway in California. The accident caused a 2-day hold-up while hauling crews brought in heavy cranes and a new trailer to replace the broken equipment.
The transformer's 20-vehicle convoy crawled through much of California at 3 to 6 mph, barely covering 50 miles in a 12-hour stretch. But yesterday, thanks to low-traffic and flat roads along its final, 80-mile route, the convoy traveled at an average speed of about 20 mph.
Now that the transformer is in place, the arduous process of linking it to the main grid and restoring the Westwing substation begins.
"This is the beginning of the solution," Gross said. "It isn't quite the solution, yet."
APS will need three weeks to connect and install the new transformer, at which point the substation will operate at two-thirds capacity.
By 7 a.m. today, workers from APS and Precision Heavy Haul of Phoenix had already begun the laborious work of transferring the transformer via crane to a smaller rig, and from there to the transformer pad where it will soon be connected to the power grid.
"A mid-August run date for the restored transformer still looks realistic," says Gross. "This will provide a tremendous amount of relief for our customers."
Since the July 4 fire, the Westwing substation, which services both Tucson and the Valley, has operated at one-third capacity, creating the threat of rolling blackouts throughout the Phoenix area.
Once the new transformer has been installed, APS should be able to meet peak demand, says Gross.
The substation will probably not be restored to full capacity until next summer.
APS is waiting for third-party investigators to examine the four other transformers damaged in the fire before replacing them.