Third Benchmarking Report on Quality of Electricity Supply

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cause, however, Ofgem has defined a mechanism which allows companies to ask for the impactof a small number of exceptional events to be excluded from their performance (see AdditionalInformation 1.6). Similarly, in Hungary and in the Czech Republic exceptional events can be recognizedby a public authority.ADDITIONAL INFORMATION 1.6 – IDENTIFYING EXCEPTIONAL EVENTSIn Great Britain distribution companies must make a claim within 14 days of the end of an exceptionalevent. For event to be eligible it must satisfy certain thresholds.1.1 Severe weather conditionsA weather event is classed as exceptional if it causes 8 or more times the daily mean number offaults at higher voltage (i.e. at MV and above) in a 24 hour period. The full audited impact of theevent is then excluded under the interruption incentive scheme.The restoration performance is then separately incentivised under the guaranteed standard forsupply restoration in severe weather.1.2 Other eventsOther types of event will only be eligible for adjustment if they are outside the companies’ controland caused by some external factor. For example, this includes third-party damage such as vandalismor terrorism but would not include a failure of protection equipment or a fire at a substation.Only interruptions above the following absolute thresholds are excluded from the performance:· 25,000 customers affected (approx 1.5 CI for an average company)2 million customer minutes lost (approx 1 CML)·For other events Ofgem’s auditors will review the extent to which the company has taken appropriatemitigating actions. If the company has performed appropriately the full impact above thethreshold will be removed. Otherwise a reduced adjustment will be applied.In addition to the eight countries mentioned above that have full recording protocols, there isanother group of five countries (Belgium-Wallonia, Estonia, Finland, France, and Lithuania) wherea definition is given in the regulations, of circumstances where the company is not consideredresponsible for the interruption (see Annex 2 – Force Majeure). It is important to note that thesecountries have all introduced continuity standards (at single customer level) and therefore needexclusions where an event is outside the company’s control.Finally it should be noted that in Belgium-Wallonia, Finland, Lithuania, and France interruptions arerecorded with an indication of causes. In Lithuania, where the regulator had already planned, whendefining the causes of interruption, to introduce an incentive/penalty scheme in the near future, theattribution of responsibility is taken into account; in the other countries of this latter group the list ofcauses is mostly technical and does not necessarily identify the responsible party.15<strong>Third</strong> <strong>Benchmarking</strong> <strong>Report</strong> on Quality of Electricity Supply – 2005 · Chapter 1
1.6.3 Rules for recording short interruptionsAs mentioned above, Finland, France, Great Britain, Hungary, Italy and Norway (since 2005)monitor short interruptions. Among them, only Hungary and Italy count separately transient andshort interruptions and in France transients are not recorded.Short interruptions derive from the presence on the network of reclosers, that generally are remotelycontrolled. A recloser attempts to clear a fault in a short time, or it is remotely activated by personnel.Hence, the number of short interruptions is calculated, where possible, from SCADA information.Where this is not available companies may use counter readings on reclosing devices. Inthe case of multi-shot reclosing schemes, only one short interruption is counted where the successfulrestoration is achieved by a sequence of multiple operations in less than three minutes.France, Great Britain, and Italy addressed an important matter in the questionnaire: how the numberof users affected by this type of interruptions is assessed. In France, for MV networks, shortinterruptions are automatically measured for each customer with remote control systems. For LVnetworks, operators estimate the number of users affected by measuring short interruptions at everyinterface between MV and LV networks (LV substation). When an interruption occurs at a certainLV substation, every customer connected to this substation may be affected. In Great Britain thenumber of customers interrupted is identified in the same way as for long interruptions (seeAdditional Information 1.4). If a company uses periodic counts of recloser operations to calculatethe number of short interruptions, the number of customers interrupted will be based on an estimateof those customers who would have been interrupted if the circuit was configured normally. InItaly, distribution companies are required (by 2006) to know the exact list of MV users affected byeach short interruption using the actual network configuration at the time of the interruption.Such measurements are particularly important in France, the only country where a standard forthe maximum yearly number of short unplanned interruptions applies (to MV consumers only).ADDITIONAL INFORMATION 1.7 – RULES FOR SEQUENCES OF INTERRUPTIONSMeaningful attention must be paid to interruption sequences, as different rules are used inEU countries. As regards short interruptions, for instance:· in Great Britain it is required to record short interruptions which follow long interruptions only ifthe time between the end of the long interruption and the start of the short interruption lasts morethan three hours; short interruptions occurring for some customers during a long interruption forother customers on the same circuit are not counted. Short interruptions which precede longinterruptions must be recorded as separate interruptions,· In Italy short interruptions are always recorded, if there are more than three minutes from theprevious interruption (short or long). Interruptions occurring to different customers on the samecircuit can have different duration and are classified as long or short using each single customerviewpoint.16Council of European Energy Regulators – Ref: C05-QOS-01-03
Page 1: Council ofEuropeanEnergyRegulatorsT
Page 4: Council ofEuropeanEnergyRegulatorsE
Page 10: CHAPTER 1 - Continuity of SupplyCON
Page 13 and 14: ··utes are defined as “short in
Page 15 and 16: interruptions is very small. AIT is
Page 17 and 18: Interruptions shorter than three mi
Page 19 and 20: 1.6.1 Weighting methods used for co
Page 21 and 22: ADDITIONAL INFORMATION 1.3 - NOTICE
Page 23: and in Italy the integration of the
Page 27 and 28: ADDITIONAL INFORMATION 1.8 - AUDITS
Page 29: SAIDI1.7.1 Unplanned SAIDI not attr
Page 34 and 35: FIG 1.7 UNPLANNED INTERRUPTIONS Sho
Page 36: ···There is some evidence to sup
Page 40 and 41: THE USE OF STANDARDS AND INCENTIVES
Page 42 and 43: 2.2.1 Continuity measurement system
Page 44 and 45: Almost all countries having adopted
Page 46 and 47: 2.2.3 Findings I: Quality measureme
Page 48 and 49: The incentive is symmetric and rela
Page 50 and 51: In Sweden, a quality of supply inde
Page 52 and 53: Regulators’ concern with the vola
Page 54 and 55: In Great Britain the regulator (Ofg
Page 56 and 57: ··A regime to avoid overquality i
Page 58 and 59: ··gets”; introduction of an upp
Page 60 and 61: FIG 2.4/b CONVERGENCE EFFECT OF THE
Page 62 and 63: 2.4 Continuity standards at single-
Page 64 and 65: Observation suggests that there is
Page 66 and 67: 2.4.2 Multiple interruption standar
Page 68 and 69: 2.4.3 Single-customer standards rel
Page 70 and 71: E SIStandard for long interruptions
Page 72: introduce single-customer standards
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STANDARDS IN COMMERCIAL QUALITY REG
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Commercial quality regulation attem
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The evaluation of the actual level
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TABLE 3.5MOST FREQUENTLY USED COMME
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the standards relating to a particu
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Quest.2.1.19Supp.1Recomm.✰✰✰
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3.3.3 Problems associated with volt
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the compensation paid by the electr
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Quest.2.1.23Supp.0Recomm.✰✰✰D
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answered (for instance Portugal and
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countries who supplied data have a
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metering problems, customer’s que
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step. CEER recommends that member s
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CHAPTER 4 - Voltage Quality Monitor
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For the rest of the voltage quality
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·In Czech Republic a monitoring sy
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tion point of single customers: in
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ADDITIONAL INFORMATION 4.2 - POWER
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ator must advise clients connected
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ADDITIONAL INFORMATION 4.3 - CUSTOM
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mandatory such values are applicabl
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ANNEXES - ANNEX TO CHAPTER 1.Sectio
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Appendix - BELGIUM - Wallonia1. Acc
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(CONTINUE) SECTION 2 - PLANNED INTE
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TABLE 3.4 - UNPLANNED INTERRUPTIONS
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TABLE 3.10 - ENERGY NOT SUPPLIED AS
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TABLE 4.2 - VOLTAGE LEVEL ANALYSIS
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The classification of continuity da
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The same pattern emerges with the i
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ANNEX TO CHAPTER 2.Annex 2.1 - Comp
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Quest.2.1.18Supp.0Recomm.✰✰DSO5
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Quest.1.1.9Supp.0Recomm.✰✰✰DS
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3.3.10.4 HungarySupply level in the
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TABLE 3.2INDICATORS1.1.1. Average w
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TABLE 3.3.AINDICATORS2.1.1. Respond
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TABLE 3.3.BINDICATORS2.1.1.Respondi
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TABLE 3.4INDICATORSAustriaBg Flande
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TABLE 3.6 ESTIMATING CHARGES (WORKI
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TABLE 3.10 CONNECTING (SUPPLY AND M
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TABLE 3.14 AVERAGE TIME TO PROVIDE
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TABLE 3.18 METER PROBLEMS (WORKING
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TABLE 3.22 RESPONSE TO CUSTOMER LET
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TABLE 3.27 AVERAGE WAITING TIME IN
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TABLE 3.32 NUMBER OF COMPLAINTS PER
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TABLE 3.38PREPAYMENT METER FAULT (W
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TABLE 3.43NUMBER OF REVISED BILLS P
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ANNEX TO CHAPTER 4.ANNEX 4.1 Voltag
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TABLE 2: NORWAY: Flicker severity l
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TABLE 5: PORTUGAL: for EHV and HV,
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Third Benchmarking Report on Quality of Electricity Supply

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