Dr. W. H. Wellssow, © i d s GmbH EttlingenMai 2003 CIRED Round Table 5 Fault Statistics in Distribution Networks Dr. W.H. Wellssow IDS GmbH Ettlingen, Germany Barcelona,

Dr. W. H. Wellssow, © i d s GmbH EttlingenSeite 2Mai 2003 Topics Purposes of failure and quality statistics in distribution systems  Quality statistics from the customer point of view  Reliability statistics as a source for component reliability indices  Equipment failure statistics for asset management purposes Data requirements for the a.m. purposes Benefits (in general terms) from the use of the collected data Requirements for the data collection scheme

Dr. W. H. Wellssow, © i d s GmbH EttlingenSeite 3Mai 2003 Regulation Measures in Europa Guaranteed minimum standard for each customer Minimum standards for system performance Regulator CustomerFond Grid Operator payment in case of violation Compensation in case of over- or under-performance e.g. setting and supervision e.g. publication and benchmarking Compensa- tion for energy not supplied e.g. setting direct payment

Dr. W. H. Wellssow, © i d s GmbH EttlingenSeite 4Mai 2003 Aspects of Quality of Supply Quality of Supply Commercial Quality Reliability of Supply voltage Quality

Dr. W. H. Wellssow, © i d s GmbH EttlingenSeite 5Mai 2003 Aspects of Quality of Supply Commercial Quality  Information policy on conditions of supply  Transactions  billing  Response on customer requests Reliability of Supply  Guaranteed Standards (for the individual customer)  Overall Standards (system performance) Voltage Quality  Technical properties of the supply voltage  Frequency deviations  Voltage dips  Harmonics and unsymmetries

Dr. W. H. Wellssow, © i d s GmbH EttlingenSeite 6Mai 2003 Quality statistics from the customer point of view Purpose  Monitoring of the supply reliability offered to the customer  Data may be used by the regulator Results  E.g. DISQUAL indices  Average frequancy of supply interruptions per customer and year (SAIFI)  Average interruption duration per year and customer served (non-availabilty, SAIDI)  Average interruption duration per customer supply interruption (CAIDI)

Dr. W. H. Wellssow, © i d s GmbH EttlingenSeite 7Mai 2003 Reliability statistics as a source for component reliability indices Purpose  Providing input data for reliability analysis  May be used by the grid operator for system planning Results  Failure rates of system components  Repair rates  of system components  Conditional probabilities for e.g. protection malfunction  Other data like duration for manual switching etc.

Dr. W. H. Wellssow, © i d s GmbH EttlingenSeite 8Mai 2003 Equipment failure statistics for asset management purposes Purpose  Providing input data for Asset Management  May be used by the grid operator for maintenace scheduling or re-investment planning Results  Failure rates for individual types of equipment  Damage rates for individual types of equipment  E.g. as a function of equipment stresses or ageing

Dr. W. H. Wellssow, © i d s GmbH EttlingenSeite 9Mai 2003 Purpose and Data Requirements of Failure Statistics System Data Equipment Data Quality statistics from the customer point of view Reliability statistics as a source for component reliability indices Equipment failure statistics for asset management purposes

Dr. W. H. Wellssow, © i d s GmbH EttlingenSeite 10Mai 2003 Contribution to VDN Statistics in % of system length % of total system length Failure reports Error free

Dr. W. H. Wellssow, © i d s GmbH EttlingenSeite 11Mai 2003 Restructuring of the VDN Statistics

Dr. W. H. Wellssow, © i d s GmbH EttlingenSeite 12Mai 2003 XML Format for Reporting of Incidents