High-Voltage Cable Maintenance Techniques

TEACHING UNIT 1. THE NEED FOR MAINTENANCE ON ISOLATED LINES Aging of power grids: Let them wear out, extend their life, or replace them? Development and implementation of a diagnostic program for electric power grids Life-Cycle Cost Estimation Bibliography TEACHING UNIT 2. DIAGNOSTIC TECHNIQUES Introduction Main Types of Cable Systems in High-Voltage Networks Diagnostic Techniques Summary Tables of Diagnostic Techniques Applied to AC Cable Systems TEACHING UNIT 3. FAILURE ANALYSIS Introduction Cable Systems Aging, Degradation, and Failure Why Do Cables Fail? Failures Insulated Cables Types of fluid-insulated cables Aging of oil-insulated cables Maintenance of submarine cables Unusual operating data Failures Probabilities of failure Evidence of failure in cables and accessories Tests Conclusion Bibliography TEACHING UNIT 4. FAULT LOCATION Introduction Insulation Conditions: Cables in Good Condition, Poor Condition, and Faulty Procedure for Locating Faults in Cables and Subsequent Repair Methods for Preliminary Fault Location in Cables Mapping the cable route Modern methods for precise fault location (pinpointing) Cable identification Procedures for fault detection Bibliography TEACHING UNIT 5. DESIGN. FAILURE ANALYSIS Objective Scope Design considerations Construction considerations Conclusions TEACHING UNIT 6. MAINTENANCE PROCEDURES Summary of the module “High-Voltage Cable Maintenance Techniques” Parameters to Monitor in Grid Components Types of Maintenance Maintenance Procedures Maintenance Intervals List of Maintenance Intervals Appendix I. Legal Aspects in Spain Appendix II. Summary Diagrams