EN 62256:2017

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Wasserturbinen, Speicherpumpen und Pumpturbinen - Modernisierung und Verbesserung der Leistungseigenschaften (IEC 62256:2017)Turbines hydrauliques, pompes d'accumulation et pompes turbines - Réhabilitation et amélioration des performances (IEC 62256:2017)Hydraulic turbines, storage pumps and pump-turbines - Rehabilitation and performance improvement (IEC 62256:2017)27.140Vodna energijaHydraulic energy engineeringICS:Ta slovenski standard je istoveten z:EN 62256:2017SIST EN 62256:2017en01-oktober-2017SIST EN 62256:2017SLOVENSKI
STANDARDSIST EN 62256:20081DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 62256
September 2017 ICS 27.140
Supersedes
EN 62256:2008
English Version
Hydraulic turbines, storage pumps and pump-turbines - Rehabilitation and performance improvement (IEC 62256:2017)
Turbines hydrauliques, pompes d'accumulation et pompes turbines - Réhabilitation et amélioration des performances (IEC 62256:2017)
Wasserturbinen, Speicherpumpen und Pumpturbinen - Modernisierung und Verbesserung der Leistungseigenschaften (IEC 62256:2017) This European Standard was approved by CENELEC on 2017-07-04. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17,
B-1000 Brussels © 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 62256:2017 E SIST EN 62256:2017

This document supersedes EN 62256:2008. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 62256:2017 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60041 NOTE Harmonized as EN 60041. IEC 60193 NOTE Harmonized as EN 60193. IEC 60609 (Series) NOTE Harmonized as EN 60609 (Series). IEC 60994 NOTE Harmonized as EN 60994. IEC 62097 NOTE Harmonized as EN 62097. IEC 62364 NOTE Harmonized as EN 62364.
IEC 62256 Edition 2.0 2017-05 INTERNATIONAL STANDARD
Hydraulic turbines, storage pumps and pump-turbines – Rehabilitation and performance improvement
INTERNATIONAL ELECTROTECHNICAL COMMISSION
ICS 27.140
ISBN 978-2-8322-4340-4
– 2 – IEC 62256:2017 © IEC 2017 CONTENTS FOREWORD . 7 INTRODUCTION . 9 1 Scope . 10 2 Normative references . 10 3 Terms, definitions and nomenclature . 10 4 Reasons for rehabilitating . 12 4.1 General . 12 4.2 Reliability and availability increase. 14 4.3 Life extension and performance restoration . 14 4.4 Performance improvement . 14 4.5 Plant safety improvement . 14 4.6 Environmental, social and regulatory issues . 15 4.7 Maintenance and operating cost reduction . 15 4.8 Other considerations . 15 5 Phases of a rehabilitation project . 15 5.1 General . 15 5.2 Decision on organization . 17 5.2.1 General . 17 5.2.2 Expertise required . 17 5.2.3 Contract arrangement . 17 5.3 Level of assessment and determination of scope . 18 5.3.1 General . 18 5.3.2 Feasibility study – Stage 1 . 19 5.3.3 Feasibility study – Stage 2 . 19 5.3.4 Detailed study. 19 5.4 Contractual issues . 23 5.4.1 General . 23 5.4.2 Specification requirements . 24 5.4.3 Tendering documents and evaluation of tenders . 24 5.4.4 Contract award(s) . 25 5.5 Execution of project . 25 5.5.1 Model test activities . 25 5.5.2 Design, construction, installation and testing . 25 5.6 Evaluation of results and compliance with guarantees . 26 5.6.1 General . 26 5.6.2 Turbine performance evaluation. 26 5.6.3 Generator performance evaluation . 27 5.6.4 Penalties and/or bonuses assessment . 27 6 Scheduling, cost analysis and risk analysis . 27 6.1 Scheduling . 27 6.1.1 General . 27 6.1.2 Scheduling – Assessment, feasibility and detailed study phases . 28 6.1.3 Evaluating the scheduling component of alternatives . 28 6.1.4 Scheduling specification and tendering phase . 29 6.1.5 Scheduling project execution phases . 29 6.2 Economic and financial analyses . 29 SIST EN 62256:2017

IEC 62256:2017 © IEC 2017 – 3 – 6.2.1 General . 29 6.2.2 Benefit-cost analysis . 30 6.2.3 Identification of anticipated benefits . 31 6.2.4 Identification of anticipated costs and benefits . 32 6.2.5 Sensitivity analysis . 33 6.2.6 Conclusions . 34 6.3 Risk analysis. 34 6.3.1 General . 34 6.3.2 Non-achievement of performance risk . 34 6.3.3 Risk of continued operation without rehabilitation . 35 6.3.4 Extension of outage risk . 35 6.3.5 Financial risks . 35 6.3.6 Project scope risk . 36 6.3.7 Other risks . 36 7 Assessment and determination of scope of the work . 37 7.1 General . 37 7.2 Assessment of the site . 37 7.2.1 Hydrology . 37 7.2.2 Actual energy production . 38 7.2.3 Environmental, social and regulatory issues . 38 7.3 The assessment of the turbine . 39 7.3.1 General . 39 7.3.2 Turbine integrity assessment . 39 7.3.3 Residual life. 52 7.3.4 Turbine performance assessment . 61 7.4 The assessment of related equipment . 83 7.4.1 General . 83 7.4.2 Generator and thrust bearing . 84 7.4.3 Turbine governor . 84 7.4.4 Turbine inlet and outlet valves, pressure relief valve . 85 7.4.5 Auxiliary equipment . 85 7.4.6 Equipment for erection, dismantling and maintenance . 86 7.4.7 Penstock and other water passages . 86 7.4.8 Consequences of changes in plant specific hydraulic energy (head) . 86 7.4.9 Grid integration . 87 8 Hydraulic design and performance testing options . 87 8.1 General . 87 8.2 Computational hydraulic design . 88 8.2.1 General . 88 8.2.2 The role of CFD . 88 8.2.3 The process of a CFD cycle . 89 8.2.4 The accuracy of CFD results . 89 8.2.5 How to use CFD for rehabilitation . 90 8.2.6 CFD versus model tests .
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