IEC TS 62257-9-1:2016

Recommendations for renewable energy and hybrid systems for rural electrification - Part 9-1: Integrated systems - Micropower systems

IEC TS 62257-9-1:2016(E) provides general requirements for the design, erection and operation of micropower plants and general requirements to ensure the safety of persons and property. The micropower plants covered by this specification are low-voltage a.c., three-phase or single-phase, with rated capacity less than, or equal to, 100 kVA. The main technical changes with regard to the previous edition are as follows: changing the voltage range covered by the technical specification to AC nominal voltage below 1 000 V and DC nominal voltage below 1 500 V.
This publication is to be read in conjunction with IEC 62257 series.

General Information

• Status: Published
• Publication Date: 26-Sep-2016
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 27.160 - Solar energy engineering
• Technical Committee: TC 82 - Solar photovoltaic energy systems
• Drafting Committee: JWG 1 - TC 82/JWG 1
• Current Stage: PPUB - Publication issued
• Start Date: 15-Nov-2016
• Completion Date: 27-Sep-2016

Relations

• Revises: IEC TS 62257-9-1:2008 - Recommendations for small renewable energy and hybrid systems for rural electrification - Part 9-1: Micropower systems
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC TS 62257-9-1 ®
Edition 2.0 2016-09
TECHNICAL
SPECIFICATION
colour
inside
Recommendations for renewable energy and hybrid systems for rural
electrification –
Part 9-1: Integrated systems – Micropower systems

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IEC TS 62257-9-1 ®
Edition 2.0 2016-09
TECHNICAL
SPECIFICATION
colour
inside
Recommendations for renewable energy and hybrid systems for rural

electrification –
Part 9-1: Integrated systems – Micropower systems

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 27.160 ISBN 978-2-8322-3585-0

– 2 – IEC TS 62257-9-1:2016 © IEC 2016
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references. 9
3 Terms and definitions . 9
4 General . 11
4.1 Boundary of a micropower plant . 11
4.2 Composition of a micropower plant . 12
4.3 General functional layout of a micropower plant . 12
5 Design . 13
5.1 Design criteria . 13
5.2 Power generation mix . 14
5.2.1 General . 14
5.2.2 Internal combustion generator sets . 15
5.3 Electrical design . 15
5.3.1 System voltage selection . 15
5.3.2 Interconnection of generators . 16
5.4 Mechanical and civil works . 16
5.4.1 Civil works . 16
5.4.2 Technical room . 16
5.4.3 Battery room . 17
5.4.4 Specific requirements . 17
6 Safety issues . 17
6.1 Electrical issues . 17
6.1.1 General . 17
6.1.2 Specific requirements . 17
6.2 Mechanical issues . 21
6.3 Thermal and fire issues . 21
6.4 Noise issues . 21
6.5 Access security . 22
7 Erection of equipment . 22
7.1 Siting . 22
7.1.1 Photovoltaic array . 22
7.1.2 Wind turbine . 22
7.1.3 Micro-hydro turbine . 22
7.1.4 Generator set . 23
7.1.5 Technical room . 23
7.1.6 Battery bank (battery enclosure) . 23
7.2 Equipment installation . 24
7.2.1 Mechanical . 24
7.2.2 Electrical . 24
8 Acceptance process. 27
8.1 General . 27
8.2 Phase 1: Preparation . 27
8.3 Phase 2: Documentation . 27

8.4 Phase 3: Commissioning . 27
8.4.1 Step 1: Evaluation of the conformity of the installed system with the
accepted design . 27
8.4.2 Step 2: Evaluation of qualification of the installation . 27
8.4.3 Step 3: Preliminary tests . 27
8.4.4 Step 4: Performance testing . 28
8.5 Phase 4: Agreement . 29
8.6 Commissioning records . 29
9 Operation, maintenance and replacement . 29
10 Marking and documentation . 29
10.1 Marking . 29
10.1.1 Information for emergency services . 29
10.1.2 Information for maintenance . 29
10.1.3 Information for batteries . 30
10.1.4 Signs . 30
10.2 Documentation . 30
Annex A (informative) Selectivity of protection . 32
Annex B (informative) Risk assessment of lightning stroke . 34
B.1 General . 34
B.2 Risk assessment simplified methodology . 34
B.3 Risk assessment multi-criteria methodology . 34
Annex C (normative) Voltage domains . 37
Annex D (informative) Battery room . 38
D.1 Administrative formalities . 38
D.2 Battery siting . 38
D.3 Characteristics of the battery storage site: specific battery room or locker . 38
D.4 Electrical equipment . 39
D.5 Safety instructions . 40
D.6 Battery enclosure examples (informative) . 40
Annex E (informative) Energy fraction calculations . 45
Annex F (informative) Noise control . 46
F.1 General . 46
F.2 Assessment of noise annoyance . 46
F.3 Principles of noise attenuation . 46
F.4 Noise reduction methods for specific items of equipment . 47
F.4.1 Generator sets . 47
F.4.2 Wind turbines . 47
F.4.3 Inverters and other electronic equipment . 47
Annex G (informative) Commissioning record sheet (examples) . 48
Bibliography . 59

Figure 1 – Micropower system limits . 12
Figure 2 – Example of functional layout for a micropower plant supplying a.c. energy . 13
Figure 3 – Interconnection configuration with d.c. bus and a.c. bus . 16
Figure 4 – Interconnection configuration with a.c. bus only . 16
Figure 5 – Example of protection against effects of lightning and over-voltage for
generators with two live conductors output (d.c. or a.c.) TNS P+N . 18

– 4 – IEC TS 62257-9-1:2016 © IEC 2016
Figure 6 – Example of protection against effects of lightning over-voltage for three
phase generators with four live a.c. conductors (TNS P+N scheme) – Generator side. 19
Figure 7 – Example o
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