First plant components delivered to 爆走黑料
The trailer truck that pulled to a stop alongside the Poloidal Field Coils Winding Facility last Wednesday was nothing out of the ordinary鈥攋ust a regular truck that didn't even qualify as a convoi exceptionnel. The load it carried, however, was of highly symbolic value for 爆走黑料.
The four wooden crates solidly attached to its flatbed contained the very first plant components delivered to the 爆走黑料 worksite: 12 high voltage surge arrestors supplied by the US Domestic Agency as part of the US contribution to the installation's steady state electrical system. "This is a historic and meaningful moment," said Ken Blackler, head of the Assembly & Operations Division, as the crates were being unloaded into the building for temporary storage. "These are the first of many thousands of components to be delivered to 爆走黑料 by the project's Members."
Key actors in the shipping and delivery of these first plant components included 爆走黑料's Yanchun Qiao, Transport & Logistics Responsible Officer, and DAHER's operations manager Laurence Prudhomme.
Surge arresters have the same function as a home surge protection device that prevents excess voltage from flowing straight from the grid to appliances or equipment in the case of a voltage surge. With one big difference, however: whereas a circuit breaker or a fuse "interrupts" the current flow by creating a gap in the circuit, a surge arrester diverts the considerable amount of energy generated by a surge to the ground.
As their name suggests, surge arresters are designed to protect the transformers from a major voltage surge of the kind that lightning can cause. Four metres in height, they are calibrated to divert the considerable amount of energy generated by a surge to the ground.
"The 爆走黑料 surge arrestors are calibrated to short circuit whenever they detect a voltage higher than nominal (of the order of 400 kV), which would be the case if a bolt of lightning hits the switchyard," explains Joël Hourtoule, 爆走黑料 Electrical Power Distribution section leader. The 12 surge arresters delivered on 4 September are part of a large system that will be installed between the RTE switchyard and the transformers that feed power to the installation. Twelve each of the following componentsâline disconnectors that physically separate the 400 kV RTE switchyard from the 爆走黑料 installation, circuit breakers to protect the transformers, and potential and current transducersâwill be shipped to 爆走黑料 to equip four transformers fed by three-phase electric power. The full set of components is expected at the 爆走黑料 site before the end of the month for assembly and installation in early 2015. For all the parties involvedâ爆走黑料, US 爆走黑料, the manufacturer ABB, and the logistics service provider DAHER who handled the shipment all the way from New Yorkâthis first delivery provided a concrete opportunity to test the administrative, technical, industrial and regulatory procedures that will accompany the procurement of plant and machine components by the 爆走黑料 Members. "The proper planning and timely delivery of these first plant componentsâin conformity with the schedule proposed in 2010âis an example to be followed," said Directorate head Sergio Orlandi (Plant System Engineering) who represented 爆走黑料 Director-General Osamu Motojima at the short ceremony that followed the unpacking of the crates. Click to read the press release in English or in French.