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EN IEC 61116:2025

(Main)

Electromechanical equipment guidance for small hydroelectric installations

Electromechanical equipment guidance for small hydroelectric installations

IEC 61116:2025 used as a guidance that applies to hydroelectric installations containing impulse or reaction turbines with unit power up to about 15 MW and reference diameter of about 3 m. These figures do not represent absolute limits. This document deals only with the direct relations between the purchaser or the consulting engineer and the supplier. It does not deal with civil works, administrative conditions or commercial conditions. This document is intended to be used by all concerned in the installation of electromechanical equipment for small hydroelectric plants. This document, based essentially on practical information, aims specifically at supplying the purchaser of the equipment with information which will assist him with the following: preparation of the call for tenders; - evaluation of the tenders; - contact with the supplier during the design and manufacture of the equipment; - quality control during the manufacture and shop-testing; - follow-up of site erection; - commissioning; - acceptance tests; - operation and maintenance. The document comprises the following: a) general requirements for the electromechanical equipment of small hydroelectric installations; b) technical specifications for the electromechanical equipment, excluding its dimensioning and standardization; c) requirements for acceptance, operation and maintenance This second edition cancels and replaces the first edition published in 1992. This edition includes the following significant technical changes with respect to the previous edition: a) harmonization of scope with IEC 62006; b) introduction of new technical aspects; c) overall editorial revision.

Anleitung für die elektromechanische Ausrüstung von kleinen Wasserkraftanlagen

Recommandations pour l'équipement électromécanique des petits aménagements hydroélectriques

L'IEC 61116:2025 fournit des recommandations applicables aux aménagements hydroélectriques équipés de turbines à action ou à réaction caractérisées par une puissance jusqu'à 15 MW environ par groupe et par un diamètre de référence de 3 m environ. Ces valeurs ne constituent pas des limites absolues. Le présent document traite uniquement des relations directes entre l'acquéreur ou l'ingénieur conseil et le fournisseur. II ne traite ni du génie civil ni des conditions administratives ou commerciales. Le présent document est destiné à être utilisé par l'ensemble des parties intéressées par l'installation d'équipements électromécaniques pour les petits aménagements hydroélectriques. Le présent document, fondé essentiellement sur des informations pratiques, a pour objet particulier de fournir à l'acquéreur de l'équipement des renseignements qui lui faciliteront: - la préparation des appels d'offres; - l'évaluation des offres; - les contacts avec le fournisseur pendant la conception et la fabrication des équipements; - le contrôle de qualité pendant la fabrication et les essais en usine; - le suivi du montage sur site; - la mise en service; - les essais de réception; - l'exploitation et l'entretien. Le document comporte: a) des exigences générales pour l'équipement électromécanique des petits aménagements hydroélectriques; b) des spécifications techniques pour l'équipement électromécanique, à l'exclusion de son dimensionnement et de toute normalisation dans ce domaine; c) des exigences pour la réception, l'exploitation et l'entretien Cette deuxième édition annule et remplace la première édition parue en 1992. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) harmonisation du domaine d'application avec l'IEC 62006; b) introduction de nouveaux aspects techniques; c) révision rédactionnelle complète

Navodilo za elektromehansko opremo malih hidroelektrarn (IEC 61116:2025)

General Information

Status
Published
Publication Date
20-Nov-2025
ICS
27.140 - Hydraulic energy engineering
29.160.20 - Generators
Technical Committee
CLC/SR 4 - Hydraulic turbines
Drafting Committee
IEC/TC 4 - IEC_TC_4
Current Stage
6060 - Document made available - Publishing
Start Date
21-Nov-2025
Due Date
28-Feb-2025
Completion Date
21-Nov-2025
Ref Project
SIST EN IEC 61116:2026 - Electromechanical equipment guidance for small hydroelectric installations (IEC 61116:2025)

Relations

Replaces
EN 61116:1994 - Electromechanical equipment guide for small hydroelectric installations
Effective Date
14-Jun-2022
EN IEC 61116:2026EN IEC 61116:2026
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Standard
EN IEC 61116:2026
English language
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Standards Content (Sample)


SLOVENSKI STANDARD
01-januar-2026
Nadomešča:
SIST EN 61116:2001
Navodilo za elektromehansko opremo malih hidroelektrarn (IEC 61116:2025)
Electromechanical equipment guidance for small hydroelectric installations (IEC
61116:2025)
Anleitung für die elektromechanische Ausrüstung von kleinen Wasserkraftanlagen (IEC
61116:2025)
Recommandations pour l'équipement électromécanique des petits aménagements
hydroélectriques (IEC 61116:2025)
Ta slovenski standard je istoveten z: EN IEC 61116:2025
ICS:
27.140 Vodna energija Hydraulic energy engineering
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61116

NORME EUROPÉENNE
EUROPÄISCHE NORM November 2025
ICS 29.160.20; 27.140 Supersedes EN 61116:1994
English Version
Electromechanical equipment guidance for small hydroelectric
installations
(IEC 61116:2025)
Recommandations pour l'équipement électromécanique Anleitung für die elektromechanische Ausrüstung von
des petits aménagements hydroélectriques kleinen Wasserkraftanlagen
(IEC 61116:2025) (IEC 61116:2025)
This European Standard was approved by CENELEC on 2025-10-30. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61116:2025 E
European foreword
The text of document 4/510/CDV, future edition 2 of IEC 61116, prepared by TC 4 "Hydraulic turbines"
was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2026-11-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2028-11-30
document have to be withdrawn
This document supersedes EN 61116:1994 and all of its amendments and corrigenda (if any).
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.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61116:2025 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 standard indicated:
IEC 60034-2-1:2024 NOTE Approved as EN IEC 60034-2-1:2024 (not modified)
IEC 60034-5:2020 NOTE Approved as EN IEC 60034-5:2020 (not modified)
IEC 60041:1991 NOTE Approved as EN 60041:1994
IEC 60076-1:2011 NOTE Approved as EN 60076-1:2011 (not modified)
IEC 60193:2019 NOTE Approved as EN IEC 60193:2019 (not modified)
IEC 60308:2024 NOTE Approved as EN IEC 60308:2024 (not modified)
IEC 60545:2021 NOTE Approved as EN IEC 60545:2021 (not modified)
IEC 60609-1 NOTE Approved as EN 60609-1
IEC 60609-2:1997 NOTE Approved as EN 60609-2:1999 (not modified)
IEC 60831-1:2014 NOTE Approved as EN 60831-1:2014 (not modified)
IEC 60871-1:2014 NOTE Approved as EN 60871-1:2014 (not modified)
IEC 61362:2024 NOTE Approved as EN IEC 61362:2024 (not modified)
IEC 61869-2:2012 NOTE Approved as EN 61869-2:2012 (not modified)
IEC 61869-3:2011 NOTE Approved as EN 61869-3:2011 (not modified)
IEC 61869-5:2011 NOTE Approved as EN 61869-5:2011 (not modified)
IEC 62006:2010 NOTE Approved as EN 62006:2011 (not modified)
IEC 62256 NOTE Approved as EN 62256
IEC 62271-100:2021 NOTE Approved as EN IEC 62271-100:2021 (not modified)
IEC 62271-102:2018 NOTE Approved as EN IEC 62271-102:2018 (not modified)
IEC 62271-102:2018/AMD1:2022 NOTE Approved as EN IEC 62271-102:2018/A1:2022 (not modified)
ISO 80000-4:2019 NOTE Approved as EN ISO 80000-4:2019 (not modified)

IEC 61116 ®
Edition 2.0 2025-09
INTERNATIONAL
STANDARD
Electromechanical equipment guidance for small hydroelectric installations

ICS 29.160.20; 27.140 ISBN 978-2-8327-0635-0

IEC 61116:2025-09(en)
IEC 61116:2025 © IEC 2025
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and units . 7
3.1 General . 7
3.2 Terms and definitions . 7
3.3 Units . 9
4 Methodology . 9
5 Description of installation and operating conditions of power station . 11
5.1 General . 11
5.2 Site conditions. 11
5.3 Hydraulic conditions for plant and design criteria for the units . 16
5.4 Electrical conditions for plant operation . 18
5.4.1 General. 18
5.4.2 The plant is intended to operate in an isolated grid . 18
5.4.3 The plant is intended to operate in parallel with a grid which imposes
the frequency . 19
5.4.4 Energy transport and distribution . 19
5.5 Types of regulation and modes of operation (reference can be made to
IEC 61362 and IEC 60308) . 20
5.5.1 Frequency regulation . 20
5.5.2 Power regulation . 20
5.5.3 Level control. 20
5.5.4 Flow regulation . 20
5.5.5 Simplified governing . 20
5.6 Automation, telemetry, remote control, alarms . 20
6 Equipment specifications . 21
6.1 General . 21
6.2 Technical requirements . 21
6.3 Limits of the supply . 21
6.3.1 General. 21
6.3.2 For the hydraulic system . 21
6.3.3 For the electric system . 21
6.3.4 For the auxiliary equipment system . 21
6.3.5 Elements not normally included in the supply . 21
6.4 Specifications of the elements of the plant . 22
6.4.1 General. 22
6.4.2 Trashrack and rack cleaner . 22
6.4.3 Water-level control . 22
6.4.4 Discharge closure devices (see Figure 5) . 22
6.4.5 Penstock . 24
6.4.6 Turbine (see Figure 6) . 25
6.4.7 Generator . 29
6.4.8 Automatic control system . 31
6.4.9 Main transformers (reference can be made to IEC 60076-1) . 33
6.4.10 Auxiliary equipment . 34
6.4.11 Spare parts and special tools . 35
IEC 61116:2025 © IEC 2025
6.4.12 Mechanical handling . 35
6.4.13 Corrosion protection . 36
6.5 Guarantees . 36
6.5.1 General. 36
6.5.2 Discharge closure devices . 37
6.5.3 Turbine . 37
6.5.4 Generator . 37
6.5.5 Governor . 38
6.5.6 Speed increaser. 38
6.5.7 Excitation equipment . 38
6.5.8 Comments concerning the complete generating set . 38
6.5.9 Main transformer. 39
6.6 General conditions for tender enquiries and comparison of tenders . 39
6.6.1 General. 39
6.6.2 Instructions to tenderers . 39
6.6.3 General conditions of contract . 39
6.6.4 Technical comparison of tenders . 39
7 Inspection, delivery, operation and maintenance . 41
7.1 General . 41
7.2 Approval of the design and inspection of the work . 42
7.2.1 Approval of design documents . 42
7.2.2 Inspection of materials and sub-assemblies . 42
7.2.3 Inspection at manufacturer's works . 42
7.2.4 Delivery . 43
7.2.5 Assembly at site . 43
7.3 Commissioning . 44
7.3.1 General. 44
7.3.2 Preliminary checks before watering-up . 44
7.3.3 Watering-up . 44
7.3.4 Unit rotation . 45
7.3.5 Preliminary checks and electrical load tests . 46
7.4 Oper
...

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