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CIRED Round Table 5 Fault Statistics in Distribution Networks

CIRED Round Table 5 Fault Statistics in Distribution Networks. Dr. W.H. Wellssow IDS GmbH Ettlingen, Germany Barcelona, 2003-05-12. Topics. Purposes of failure and quality statistics in distribution systems Quality statistics from the customer point of view

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CIRED Round Table 5 Fault Statistics in Distribution Networks

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  1. CIREDRound Table 5 Fault Statistics in Distribution Networks Dr. W.H. WellssowIDS GmbH Ettlingen, Germany Barcelona, 2003-05-12

  2. 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

  3. Regulation Measures in Europa Regulator e.g. publication and benchmarking e.g. setting and supervision e.g. setting Guaranteed minimum standard for each customer Compensa-tion for energy not supplied Minimum standards for system performance Compensation in case of over- or under-performance direct payment payment incase of violation Grid Operator Customer Fond

  4. Aspects of Quality of Supply Quality of Supply Reliability of Supply Commercial Quality voltage Quality

  5. 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

  6. 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)

  7. 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.

  8. 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

  9. Quality statistics from the customer point of view Reliability statistics as a source for component reliability indices Equipment failure statistics for asset management purposes Equipment Data Purpose and Data Requirements of Failure Statistics System Data

  10. Contribution to VDN Statistics in % of system length 100 Failure reports 90 Error free 80 70 60 % of total system length 50 40 30 20 10 0 1999 2000 2001 2002

  11. Restructuring of the VDN Statistics

  12. XML Format for Reporting of Incidents

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