Extending the Life of Underground Transmission Lines Through Cable Injection

Underground transmission lines operating above 46 kV serve as critical infrastructure, delivering power to thousands of homes or businesses. As the first solid-dielectric transmission cables approach the end of their life estimation, circuit owners are faced with a decision on how best to ensure grid reliability, often weighing the cost, timeline, and impact of replacement against cable rejuvenation. This paper will highlight the recent application of injection technology toward a critical transmission circuit feeding a major regional employer, provide an overview of the rejuvenation process and detail cable accessories developed by G&W Electric to inject underground transmission class circuits.

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