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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

CIREDRound Table 5 Fault Statistics in Distribution Networks

Dr. W.H. WellssowIDS GmbH Ettlingen, Germany

Barcelona, 2003-05-12


Topics
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


Regulation measures in europa
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


Aspects of quality of supply
Aspects of Quality of Supply

Quality of Supply

Reliability of Supply

Commercial Quality

voltage Quality


Aspects of quality of supply1
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


Quality statistics from the customer point of view
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)


Reliability statistics as a source for component reliability indices
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.


Equipment failure statistics for asset management purposes
Equipment failure statistics for asset management purposes indices

  • 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


Purpose and data requirements of failure statistics

Quality statistics from the customer point of view indices

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


Contribution to vdn statistics in of system length
Contribution to VDN Statistics in % of system length indices

100

Failure reports

90

Error free

80

70

60

% of total system length

50

40

30

20

10

0

1999

2000

2001

2002




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