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Key Principles and Practical Considerations for NRS 048-6

A Distributor Licensee Perspective

AMEU Technical Convention16-18 October 2006

Gallagher Estate, Midrand

Presented by Baden ChattertonIndustry Association Resource

Centre (IARC), Eskom Holdings

Electricity Service Delivery - “The Challenge”

2Personal Introduction Employed at Industry Association Resource Centre (IARC), previously Distribution Technology, R&S Division in Eskom Holdings

Distribution Wires Incentive Based Regulation (IBR) Implementation Committee Chairman responsible for the national strategy and co-ordination of :

• Technical and financial aspects of the Distribution network performance component of the Eskom Multi Year Price Determination (MYPD) for 2006-2009

Distribution Network Performance and Quality of Supply Study Committee (SC) Chairman responsible for the data, systems, measuring, reporting and management of :

• Network Interruption Performance• Quality of Supply (QOS)• Equipment Reliability

3Personal Introduction Cont. Member of the South African industry NRS 048 working group (WG) responsible for the “NRS 048 - Quality of Supply” basket of standards

Author of NRS 048-6 standard on behalf of the NRS 048 WG under the auspices of the Electricity Liaison Suppliers Committee (ELSC)

4Presentation Overview

1. Setting the scene……. 2. Introduction and overview of NRS 048-6 3. Key aspects of NRS 048-6 unpacked 4. Way forward

NRS 048-6 : Medium Voltage Network Interruption Performance Measuring and Reporting Standard

For NRS 048 reporting purposes, MV is defined as the set of nominal

voltage levels 1 kV ≤ Un < 44 kV

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1. Setting the Scene……

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Network Interruption Performance

Quality of Supply

Power Quality

Reliability and Availability of Supply : NRS 048-6 and 8 - Frequency of interruptions - Duration of interruptions Sustained interruptions Momentary interruptions

Quality of the Voltage Waveform : NRS 048-2 - Voltage dips - Voltage regulation - Harmonics - Flicker - Unbalance

Power Quality Unpacked

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GENERATIONCoalGas TurbineHydro ElectricPump StorageNuclear

Transmission Substations

Distribution Lines

Customer

MV Lines(11, 22 and 33kV)

TRANSMISSION765 to 220 kV Lines

DISTRIBUTION132kV 88kV66kV 44kV

LV Line(380/220V)

Distribution Substations

Electricity System in South Africa

MV/LV transformer

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Residential

Traction

Agriculture

Key Customers

Commercial

Redistributors

Prepaid

Mining & Industrial

CustomersExpectations,

Perceptions and Experiences

Power Quality provided

by licensees

Customer Expectations and ExperiencesVersus Actual Power Quality Provided

9 Why Measure……and Report ?

“To measure is to know.”“If you cannot measure it, you cannot improve it……..” Lord Kelvin, IEC's first President (1906)

NRS 048-6 provides a standard and consistent framework of MV network interruption performance measurement and reporting by distributor licensees

in South Africa

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Network Interruption Performance is much more than just SAIFI and SAIDI……..

Planning and DesignAsset ManagementSystem AutomationNetwork interconnectivityUniversal Access ProgramProtection and telecontrol

External EnvironmentLightning WindsTheft Storms Vegetation

Work/BuildManagementQuality and accuracy of build

Network OperationSwitching/operatingFault findingSupply restoration

Skills, behaviour and resourcesStaff skills and training Manpower optimisation

Network PerformancePlanned WorkMaintenanceRefurbishmentLive workStaff training

Performance MeasurementHow and what is measured ?Inclusions/exclusionsof events

Systems and Data Outage management system Data accuracy and completenessSCADA penetrationSAIDI : System Average Interruption Duration Index

SAIFI : System Average Interruption Frequency Index

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2. Introduction and Overview of NRS 048-6

12Overview of the NRS 048 Standards

NRS 048 : Quality of supply standard for Engineering or WiresNRS 047 : Quality of service standard for Customer Services or Retail

NRS 048 Standard NRS 048 Part Current StatusVoltage charateristics, compatibility levels, limits and assessment methods

NRS 048-2 Approved by ELSC

Application practices for licensees NRS 048-4 Draft and work in progress

MV network interruption performance measurement and reporting

NRS 048-6Draft 4.2 (version 9 !) sent for WG voting and ELSC voting

Application practices for end customers NRS 048-7 Draft and work in progress

HV and EHV network and large customer interruption performance measurement and reporting standard

NRS 048-8 Draft and work in progress

13Acknowledgements for NRS 048-6

Tony Dold, NRS 048 WG Chairman, eThekewni Electricity Francisa Mabuza, Project Leader, IARC, Eskom Holdings Nelson Mandela Metro

Eskom Holdings (Dx, Tx, KSACS, Corporate and R&S) SABS Ekurhuleni Municipality City Power

EIUG Tshwane Electricity Glass Industry Chamber of Mines City of Cape Town Mondi Paper Mangaung Municipality DPE NERSA IST OTOKOV

14Key Objectives of NRS 048-6 Provide standard, accurate and reliable network interruption performance measures for South Africa Minimum future system and data requirements for interruption capturing and recording for licensees Framework for local and international network performance (reliability) benchmarking and best practices Assist NERSA and licensees with the implementation of Incentive Based Regulation (IBR) Common industry high level interruption cause code hierarchy : identifying problem areas Provide annual regulatory reporting guidelines

15Foundation for NRS 048-6 International standards, work and developments

• IEEE P1366 standard (USA)• IEEE Task force on reporting practices• CIGRE : Technical report TB261• UK regulator (ofgem) : “QOS” related standards

Local work, lessons learnt and experiences • Eskom Distribution standards • Distributor licensees• AMEU role-players • Customer and industry role-players input

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3. Key Aspects of NRS 048-6 Unpacked

Refer to the final draft standard (version 4.2) or to the published

paper for the technical details and additional information

17 Scope of NRS 048-6

8. Implementation 1. Interruption performance requirements

7. Performance reporting

requirements

6. Data and change

management

NRS 048-6 standard NRS 048-6 standard

2. Interruption categories for

reporting

5. Interruption cause code categories

4. Event data auditing and

validation

3. Definition for performance

indices

It is recognised that NRS 048-6 may not be practically and financially possible currently for some licensees and is a long term objective for the effective

management of MV network interruption performance in South Africa

18Key Concepts Introduced Interruption categories for reporting

• Unplanned (“U”)• Planned (“P”) • Customer related (“C”)• Intake supply (“S’)

Customer network link (CNL) and end state levels• Data connectivity model (HV, MV and LV)• % data accuracy and completeness levels

Re-interruptions and criteria for counting• Definition and strict application criteria• Comprehensive explanatory notes

19Key Concepts Introduced Cont. Pre-arranged events for planned interruptions

• Treatment and counting of planned and co-ordinated interruptions for reporting

Generic customer categories• Broad and generic customer category descriptions• Long term (forward looking) regulatory requirements

Classification and reporting of major events• Criteria A : national comparison of licensees• Criteria B : year-on-year licensee

performance comparison and tracking

• Criteria C : internal licensee reporting

20Key Concepts Introduced Cont.. Accuracy reporting estimation methodology

• Method to audit and estimate the accuracy of the reported performance measures by licensees

• “Gatekeeper” to ensure the accuracy and integrity

Data and change management (software)• Requirements for data archiving• Requirements for tracking any system changes

Different types of licensee reporting• Annual power quality reporting• Future incentive based (IBR) reporting• Reporting for benchmarking purposes

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4. The Way Forward

22Implementation Solid future framework for EDI

4 to 7 years business plan, in order to be completely implemented by the licensees Some licensees may not meet the current requirements and may require selective exemptions Resource and financial constraints that need to be managed

Open invitation for any assistance

(011) 871 2355

chatteBG@eskom.co.za

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The challenge is now for the distributor licensees to implement the NRS 048-6 standard and start

improving their electricity service delivery – reliability and availability of electricity supply.

Electricity Service Delivery - “The Challenge”

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