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Barcelona, May 13, 2003 ASSET MANAGEMENT Development of new approaches Gerd Balzer

Barcelona, May 13, 2003 ASSET MANAGEMENT Development of new approaches Gerd Balzer Darmstadt University of Technology. TU Darmstadt Institute of Electrical Power Systems. Overview. - Introduction - Age profile of equipment - Consequence of the ageing process

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Barcelona, May 13, 2003 ASSET MANAGEMENT Development of new approaches Gerd Balzer

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  1. Barcelona, May 13, 2003 ASSET MANAGEMENTDevelopment of new approaches Gerd Balzer Darmstadt University of Technology TU Darmstadt Institute of Electrical Power Systems

  2. Overview - Introduction - Age profile of equipment - Consequence of the ageing process - Maintenance strategies - Reliability-Centered Maintenance (RCM) - Example: Assessment of substations - Renovation strategy with Fuzzy-Logic - Proposal for a Risk-Assessment - Conclusion TU Darmstadt Institute of Electrical Power Systems

  3. 1:Maintenance and diagnostic evaluationscenario search and evaluation ofeffectiveness & usability Technicalinformation(on assets) Component level Economical information(on assets)Technical information(on grid) 2:Economical evaluation of scenarios,creation of maintenance strategies,calculation of non-availability of energy System level 3:Risk management,selection of optimal scenario,and optimal strategy Decision Economical information(on business)Sociological information Corporate level Asset Management decision process (Cigre WG 23/39) TU Darmstadt Institute of Electrical Power Systems

  4. Population Year of installation Age distribution for m.v. equipment(VDEW-statistic, Germany) TU Darmstadt Institute of Electrical Power Systems

  5. Age distribution for substations (AIS)(Cigre Brochure no. 176) TU Darmstadt Institute of Electrical Power Systems

  6. Installations and replacement distribution (substation equipment, Cigre Brochure no. 176) TU Darmstadt Institute of Electrical Power Systems

  7. Consequence of ageing Falling reliability of the system is a major consequence of the ageing process: - decision to delay asset replacement - an attempt to recover by increasing asset replacement at a later stage Lower availability and further fault outages TU Darmstadt Institute of Electrical Power Systems

  8. The spiral of decline TU Darmstadt Institute of Electrical Power Systems

  9. In general the Reliability Centered Maintenance (RCM) strategy for substation can be used in two different ways: - substation approach: Which equipment/components influence the function of the complete substation (Failure Mode Effect Analysis, FMEA) - system approach: Which substations influence the availability and the performance of the system (reliability calculation and assessment of the non-delivered energy, risk management) Thereport deals with the system approach TU Darmstadt Institute of Electrical Power Systems

  10. The system approach solves the main task of an utility, due to the financial constraints and to receive a ranking of substations concerning the yearly budget: which substation has to be maintained first, second, and so on. TU Darmstadt Institute of Electrical Power Systems

  11. Reliability-centered Condition-based Time-based Corrective Different types of maintenance strategies TU Darmstadt Institute of Electrical Power Systems

  12. Corrective or Reactive Maintenance - repair or replacement after a fault - no influence on the time of failure - availability of the substation depends on the reliability of the single equipment - lowest maintenance costs without consideration of further expense TU Darmstadt Institute of Electrical Power Systems

  13. Time-Based or Scheduled Maintenance - predefined inspections (time period) - replacement after a fixed life time - high availability - no use of the equipment up to the end of the life time - most expensive maintenance strategy TU Darmstadt Institute of Electrical Power Systems

  14. Condition-Based or Predictive Maintenance - inspection or replacement due to the condition - all identical equipment are treated in the same manner TU Darmstadt Institute of Electrical Power Systems

  15. Reliability-Centered Maintenance - inspection or replacement due to the technical condition - importance of the equipment for the network - optimal maintenance strategy TU Darmstadt Institute of Electrical Power Systems

  16. Maintenance activities for specific types of equipment no yes ? no yes no yes diagnostic ? importance ? CM CBM TBM RCM Corrective ConditionBased TimeBased ReliabilityCentered Maintenance Maintenance Maintenance Maintenance Maintenance Strategies TU Darmstadt Institute of Electrical Power Systems

  17. Index ooverall indexof equipment Index ccondition of equipment Index iimportance of equipment Maintenancestrategy Procedure for maintenance planning (equipment) TU Darmstadt Institute of Electrical Power Systems

  18. Bay Disconnector Building Circuit-breaker Protection & Control Index cconditionof substation Index iimportance of substation Index ooverall indexof substation Procedure for maintenance planning (substation) TU Darmstadt Institute of Electrical Power Systems

  19. Interpretation of the assessment resultc condition of the equipment i importance of the equipment TU Darmstadt Institute of Electrical Power Systems

  20. Replacement maintenance workinspections Condition based maintenancec condition of the equipment i importance of the equipment TU Darmstadt Institute of Electrical Power Systems

  21. inspections maintenance work replacement Corrective, time-based or reliability centered maintenancec condition of the equipment i importance of the equipment TU Darmstadt Institute of Electrical Power Systems

  22. Combination of different strategiesc condition of the equipment i importance of the equipment TU Darmstadt Institute of Electrical Power Systems

  23. Assessment of 40 secondary substations 21 6/10 kV 19 30 kV (four tower stations) TU Darmstadt Institute of Electrical Power Systems

  24. Equipment of the substations - bay/type of construction - disconnector - load disconnector - transformer - building/tower TU Darmstadt Institute of Electrical Power Systems

  25. condition criteria for theassessment of bays - age; type - experiences; spare parts - safety aspects - partial discharge - pollution; humidity TU Darmstadt Institute of Electrical Power Systems

  26. Condition/% Impact of equipment evaluationg the condition assessment in percentage TU Darmstadt Institute of Electrical Power Systems

  27. Importance criteria for the assessment of secondary substations - kind of substation - maximum active power - customer - redundancy of the substation - hazard rate TU Darmstadt Institute of Electrical Power Systems

  28. 100 c 80 POHL-301 60 SHAF-299 EHSN-307 40 20 HOHA-601 0 i 0 10 20 30 40 50 60 70 80 90 100 B C replacement condition A service dC dA dB importance d Final result of the assessment TU Darmstadt Institute of Electrical Power Systems

  29. Rules Output values Input values Knowledgeprocessing Defuzzification Fuzzification Basic principle of a decision-taking process using fuzzy logic TU Darmstadt Institute of Electrical Power Systems

  30. Implementation of a maintenance strategy for substations TU Darmstadt Institute of Electrical Power Systems

  31. result Conditon 1 Conditon 3 Secondary substation condition 3: load/disconnector condition 1: bay TU Darmstadt Institute of Electrical Power Systems

  32. Risk Assessment Time after commissioning resp. service Result of reliability calculation Propability of outage of equipment Equipment model Non delivered energy Szenario:- no action- service- renovation Interruption costs- repair- interuption of supply - penalty and so on Maintenance costs- service- renovation Outage costs “sociological effects” Risk-Management TU Darmstadt Institute of Electrical Power Systems

  33. hazard rate 4 1 III II I 2 T1 T2 T3 T4 time after commissioning/last servive Equipment model TU Darmstadt Institute of Electrical Power Systems

  34. 1.0 0.8 probability of outages 0.6 0.4 0.2 0.0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 T +t T time after commissioning/last service Probability of outages of the considered equipment TU Darmstadt Institute of Electrical Power Systems

  35. 0.40 0.35 0.30 Probability of outages 0.25 0.20 0.15 Qb 0.10 Q 0.05 0.00 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 time after commissioning/last service Probability of outages of the considered equipment TU Darmstadt Institute of Electrical Power Systems

  36. Result of the assessment (substation): - comparison of different substations - determination, which equipment influences mainly the condition of the substation - what is the optimal order of substation to be maintained or replaced Decision: replacement of the equipment or new investment of the complete substation TU Darmstadt Institute of Electrical Power Systems

  37. Advantage of a computer aided assessment: - fixing of compulsory criteria - determination of the ranking due to replacementor ranking - documentation of the decision TU Darmstadt Institute of Electrical Power Systems

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