IEC TS 62257-7-3:2008

Recommendations for small renewable energy and hybrid systems for rural electrification - Part 7-3: Generator set - Selection of generator sets for rural electrification systems

IEC/TS 62257-7-3:2008(E) specifies the general requirements for the selection, sizing, erection and operation of generator sets in decentralized rural electrification systems. Applies to all low voltage combustion engine electricity generator sets with a rated power up to 100 kVA, and designed for supplying electrical power to isolated sites used in systems as described in IEC/TS 62257-2.

General Information

• Status: Published
• Publication Date: 08-Apr-2008
• ICS: 27.160 - Solar energy engineering
• ICS: 27.180 - Wind turbine energy systems
• Technical Committee: TC 82 - Solar photovoltaic energy systems
• Drafting Committee: JWG 1 - TC 82/JWG 1
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 13-Mar-2018

Relations

• Revised: IEC TS 62257-7-3:2018 - Recommendations for renewable energy and hybrid systems for rural electrification - Part 7-3: Generator set - Selection of generator sets for rural electrification systems
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC/TS 62257-7-3
Edition 1.0 2008-04
TECHNICAL
SPECIFICATION
Recommendations for small renewable energy and hybrid systems for rural
electrification –
Part 7-3: Generator set – Selection of generator sets for rural electrification
systems
IEC/TS 62257-7-3:2008(E)
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IEC/TS 62257-7-3
Edition 1.0 2008-04
TECHNICAL
SPECIFICATION
Recommendations for small renewable energy and hybrid systems for rural
electrification –
Part 7-3: Generator set – Selection of generator sets for rural electrification
systems
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
W
ICS 27.160; 27.180 ISBN 2-8318-9672-X

– 2 – TS 62257-7-3 © IEC:2008(E)

CONTENTS
FOREWORD.4

INTRODUCTION.6

1 Scope.7

2 Normative references .8

3 Terms and definitions .9

4 Introduction to generator sets .11

4.1 Generator set system .11

4.2 Generator set application in rural electrification systems .11
4.3 Resource assessment .11
5 Selection and erection .12
5.1 General .12
5.2 Selection requirements.12
5.2.1 Power quality.12
5.2.2 Generator set sizing .12
5.2.3 Generator set type.14
5.2.4 Derating factors.14
5.2.5 Starting system.15
5.2.6 Control systems.15
5.2.7 Noise issues.15
5.2.8 Environmental issues .15
5.3 Erection.15
5.3.1 Shipping .15
5.3.2 Design of the erection site .16
5.3.3 Installation requirements .17
6 Safety.20
6.1 General .20
6.2 Electrical issues .20
6.2.1 General requirements .20
6.2.2 Connection system to the application.20
6.2.3 Power cables.21
6.2.4 Neutral system .21
6.2.5 Earthing.21

6.2.6 Overcurrent protection.21
6.2.7 Residual Current protection Device (RCD).22
6.2.8 Isolating devices.22
6.3 Mechanical issues .22
6.3.1 Vibration.22
6.3.2 Protection from mechanical damage .22
6.3.3 Protection from moving parts .22
6.4 Thermal issues.23
6.5 Fire risk.23
7 Acceptance .23
7.1 General .23
7.2 Conformity of the generator set to the identification file .23
7.3 Conformity of the generator set system to the GS.23
7.4 Acceptance process .23

TS 62257-7-3 © IEC:2008(E) – 3 –

7.4.1 Preparation of the generator set for commissioning .23

7.4.2 Commissioning inspection of the generator set system .24

7.4.3 Commissioning tests of the generator set system .24

7.4.4 Test file .25

8 Operation and maintenance.25

8.1 Access to the generator set.25

8.2 Operation process .25

8.3 Monitoring .26

8.4 Maintenance schedule.26

9 Replacement .26
10 Marking .27
10.1 Generator set .27
10.2 Engine.27
10.3 Alternator .27
10.4 Shutdown apparatus.28
11 Documentation .28
11.1 General .28
11.2 Installation .28
11.3 Operation .29
11.4 Inspection and maintenance .29
Annex A (informative) Generator set classification criteria .30
Annex B (informative) Identification file.34
Annex C (informative) Maintenance schedule .35
Annex D (informative) Example of commissioning records sheet.36
Bibliography.38

Figure 1 – General functional configuration of a generator set powered system .7

Table 1 – Examples of derating factors for generator sets.14
Table 2 – Generator set permitted noise levels .15
Table 3 – Cross-section of power cables.21
Table A.1 – Classification of generator set services .30
Table A.2 – Common lifespan values .31

Table C.1 – Example of maintenance schedule.35

– 4 – TS 62257-7-3 © IEC:2008(E)

INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
RECOMMENDATIONS FOR SMALL RENEWABLE ENERGY

AND HYBRID SYSTEMS FOR RURAL ELECTRIFICATION –

Part 7-3: Generator set –
Selection of generator sets for rural electrification systems

FOREWORD
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