URD Cable Injection Results in a Significant Drop in Cable Faults
As an alternative to ongoing cable replacement, London Hydro asked Novinium to conduct a pilot cable injection project in a large subdivision. Since then, Novinium has gone on to inject more than 174,465 meters of cable for London Hydro and cable failures have declined by 58 percent.
The Company and the Situation:
In 2003, London Hydro was having major reliability issues with its aging underground cable infrastructure. In a single two-week period, one subdivision experienced seven cable-related outages. These outages were the tipping point for London Hydro to investigate methods to improve infrastructure reliability.
London Hydro understood that the cost to replace their aging cable would significantly increase its capital budget. The utility decided to conduct a pilot cable injection project in a large subdivision where several cable faults had already occurred. Between 2003 when the pilot cable injection project was completed and 2010, no further underground cable faults occurred in the pilot subdivision.
In 2010, London Hydro experienced 31 underground cable faults system-wide that impacted nearly 10,000 customers. Given the success of the pilot subdivision project, London Hydro issued a cable rejuvenation RFP and Novinium won the bid. Several challenges that the utility faced included:
- The cost and rate of underground cable failures was increasing
- Limited capital budget
- Very tight labor market in the Toronto area
- Limited availability of London Hydro switching crews