‘Many factors’ led to E-82 collapse
Enercon unit fell during component exchange at Point Tupper project
An investigation into the collapse of an Enercon E-82 turbine at the 23.3MW Point Tupper wind farm in Nova Scotia last year has found several factors led to the incident, which occurred during a component exchange.
Enercon said: “The investigation has concluded that the turbine exceeded its normal rotational speed as result of an exceptional combination of contributing factors.”
In light of the findings, the company said it has incorporated additional layers of redundancy.
“We are confident that we have implemented the necessary revisions to our processes to prevent the reoccurrence of such an event,” said Enercon.
The damaged turbine is to be replaced by the beginning of the summer.
The remaining 10 turbines continue to operate normally.
CBC News reported that the incident in August 2016 happened a few hours after a technician heard what was believed to be a loose washer in the hub.
During testing technicians heard a noise from the hub and discovered that the blades were pitched inwards approximately two degrees instead of pitched out at 90 degrees, said CBC.
An evacuation alarm was triggered automatically about four hours before the 80-metre tower buckled at the midsection and crashed to the ground. Nobody was injured.
The Point Tupper wind farm was constructed in 2010 by a joint venture between Canada's Renewable Energy Services, which is the controlling shareholder, and Nova Scotia Power.
Image: Enercon E-82 (Kuehni)