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NV Energy partnered with Novinium for a cable injection pilot program and continues to use cable injection to increase system reliability. In the pilot program, cables were targeted in an area known to have a high number of cable failures. These cables were injected and monitored while the cable injection program was in its experimental stages during the initial years. However, even after the initial pilot program, it was apparent that the program was heading in the right direction with no faulted segments recorded in the treated areas.
To date, NV Energy has recorded less than 1% of injected cables faulting after they’ve gone through the injection process. Total success is measured over many years, but initial reliability improvements and process confidence resulted in NV Energy deciding to gradually increase its investment in this program with a current program budget of $12.5 million annually.
Intermountain Rural Electric Association
Intermountain REA used the Novinium® Improved Unsustained Pressure Rejuvenation (iUPR) and Sustained Pressure Rejuvenation (SPR) processes with Cablecure® 732 fluid on both feeder and URD cable. This hybrid approach restored the greatest number of segments, avoided the cost of digging difficult-to-access splices, and significantly increased the reliability of treated cable.
To date, Intermountain REA has rejuvenated approximately 2,526,721 feet of cable. The utility realized a savings of tens of millions of dollars compared to cable replacement. The treated cable was restored to like-new condition.
Mountain View Electric Association
Mountain View Electric Association has experienced zero failures in rejuvenated cable and has rejuvenated approximately 90 percent of all URD cable addressed. Their members also benefit from cable rejuvenation in several ways including:
- Fewer cable-related outages
- Highest system reliability at the lowest possible cost due to the savings afforded by rejuvenation
- Less disruption because the cable rejuvenation process does not disturb members’ yards
- Rejuvenated cable is restored to like-new condition.
Dayton Power and Light
Dayton Power and Light chose to inject the Cablecure® 732 fluid, using Novinium’s Sustained Pressure Rejuvenation (SPR) process to treat 42,255 feet of 1000 MCM and 500 MCM cable at the Dayton International Airport. Novinium fielded several crews to ensure the critical time requirements were met. Five crewmembers worked six- and seven-day shifts inside the airport property, while two additional crews worked outside.
This solution, a proven alternative to cable replacement, restored the feeder cable’s dielectric strength for a fraction of the cost and with minimal operational disruption. Rejuvenation saved $530,161 over estimated replacement costs. The rejuvenated cable has been restored to as-new condition.
Salt River Project
Salt River Project chose to rejuvenate the least-reliable feeder cable using a hybrid approach of Improved Unsustained Rejuvenation (iUPR) and Sustained Pressure Rejuvenation (SPR) injection processes with Cablecure® 732 injection fluid. This strategy allows SRP to delay replacement of faulty cable while extending the cable life by decades. To date, the utility has rejuvenated nearly 10 million feet or 80 percent of the potential URD cable.
Rejuvenated cable is restored to like-new condition. The Novinium processes are significantly improving SRP’s bottom line. The utility is confident that by including rejuvenation in the asset management plan, they are achieving the highest reliability at the lowest cost for customers. SRP has experienced a rejuvenated cable failure rate of less than 1 percent using the hybrid approach.
St. Charles Municipal Electric Utility
The St. Charles Municipal Electric Utility knew it faced a large volume of aging underground residential distribution (URD) cable. The utility decided to track cable failures in greater detail after experiencing a steady increase in outage rates. The resulting data clearly showed the problem subdivisions, which were not necessarily the ones with the oldest electric lines. As Novinium began rehabilitating the highest prioritized subdivisions, each segment was tested using a TDR and categorized for either rejuvenation or replacement based on Novinium’s injection criteria. Segments with blockages, or those that were otherwise identified as non-injectable, were replaced.
Novinium and St. Charles rejuvenated 169,829 feet and replaced 50,127 feet for a total of 219,956 feet of like-new cable.