Transformer Struck by a Snow Grooming Machine, Releasing Oil and Preventing Chairlift Operation

Location: Sun Peaks
Regulated industry sector: Electrical - High voltage electrical system (greater than 750V).

Incident Overview

A high voltage 25KV (25,000 volt) pad mount oil filled transformer was struck by a snow grooming machine. This caused moderate damage to the transformer and released oil, making the chairlift nonoperational for nearly a week. The experienced snow grooming machine operator was looking over their right shoulder observing the machine components when the transformer was hit. Additionally, there was minimal flagging and mechanical protection provided around the high voltage transformer. Other contributing factors include an abnormally deep amount of snow around the unprotected transformer and the large size and length of the snow grooming machine.