August 3rd Power Outage

Aug 04, 2017  Comment

The cause of the August 3rd outage was related to a failed speed signal to the Whitehorse Hydro Unit #4 governor. The governor controls the electrical output from a hydro unit. The failure of this speed signal causes the hydro unit to shut down as a safeguard to prevent the unit from becoming uncontrollable. 

The loss of the speed signal was caused by a control board failure. The equipment was repaired, tested and the unit was placed back on-line.

Whitehorse Hydro Unit #4 is the largest hydro unit on the grid. When the generation was lost, the feeders tripped off in an attempt to balance the customer load to remaining generation.

Comments

Be the first to comment