Underground Cable – Replacement & Rejuvenation Presented by John Gilkey May 7, 2009

Introduction John – who???????

PSO Policy for Replacement PSOs Underground Cable Replacement guideline is to remove from service those direct buried cables that exhibit unacceptable performance.PSOs Underground Cable Replacement guideline is to remove from service those direct buried cables that exhibit unacceptable performance. Unacceptable performance is based on the number and frequency of cable failures, and takes into account the underground system configuration.Unacceptable performance is based on the number and frequency of cable failures, and takes into account the underground system configuration.

Causes for Failure Lightning Soil Conditions – Sand Dig-ins / other utilities Previous installations of splices

Repair/Replacement Guidelines Replace if neutral bad – Replace if neutral bad – Replace after 3 splices Replace after 3 splices Replace all riser/dip runs Replace all riser/dip runs Replace if fault is in a difficult location Replace if fault is in a difficult location Always replace secondary non jacketed concentric neutrals Always replace secondary non jacketed concentric neutrals

AEP Corporate Recommendations for Injection – Short Term Goals Identify the oldest, most problematic sections of URD cable. Identify the oldest, most problematic sections of URD cable. Replace these, including splices, terminations and accessories using the least invasive method(s). Replace these, including splices, terminations and accessories using the least invasive method(s). Inject only in those cases where the cable is judged to be of modern type & relatively splice-free, but extremely difficult or extremely costly to replace. Inject only in those cases where the cable is judged to be of modern type & relatively splice-free, but extremely difficult or extremely costly to replace.

AEP Corporate Recommendations for Injection - Long Term Goals Develop a comprehensive database to track cables (and other equipment) from installation to retirement. Develop a comprehensive database to track cables (and other equipment) from installation to retirement. Accelerate efforts to develop a comprehensive cable testing and condition assessment program. Accelerate efforts to develop a comprehensive cable testing and condition assessment program. Develop criteria for economic analysis of cable testing vs. replacement vs. injection to determine long term values of programs. Develop criteria for economic analysis of cable testing vs. replacement vs. injection to determine long term values of programs.

PSO / AEP Ohio Experience PSO PSO Utilix / CableCure Utilix / CableCure Notable success Notable success Other AEP Other AEP Utilix / CableCure Utilix / CableCure AEP Ohio AEP Ohio Utilix / CableCure – Novinium Utilix / CableCure – Novinium

Discussion & Questions Underground Cable – Replacement & Rejuvenation