IEC 62109-2:2011

IEC 62109-2 ®
Edition 1.0 2011-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Safety of power converters for use in photovoltaic power systems –
Part 2: Particular requirements for inverters

Sécurité des convertisseurs de puissance utilisés dans les systèmes
photovoltaïques –
Partie 2: Exigences particulières pour les onduleurs

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IEC 62109-2 ®
Edition 1.0 2011-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Safety of power converters for use in photovoltaic power systems –
Part 2: Particular requirements for inverters

Sécurité des convertisseurs de puissance utilisés dans les systèmes
photovoltaïques –
Partie 2: Exigences particulières pour les onduleurs

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX V
ICS 27.160 ISBN 978-2-88912-491-6

– 2 – 62109-2  IEC:2011
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope and object . 7
1.1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 General testing requirements. 9
4.4 Testing in single fault condition . 9
4.4.4 Single fault conditions to be applied . 9
4.4.4.15 Fault-tolerance of protection for grid-interactive inverters . 9
4.4.4.16 Stand-alone inverters – Load transfer test . 12
4.4.4.17 Cooling system failure – Blanketing test . 12
4.7 Electrical ratings tests . 12
4.7.3 Measurement requirements for AC output ports for stand-alone
inverters . 13
4.7.4 Stand-alone Inverter AC output voltage and frequency . 13
4.7.4.1 General . 13
4.7.4.2 Steady state output voltage at nominal DC input . 13
4.7.4.3 Steady state output voltage across the DC input range . 13
4.7.4.4 Load step response of the output voltage at nominal DC
input . 13
4.7.4.5 Steady state output frequency . 13
4.7.5 Stand-alone inverter output voltage waveform . 14
4.7.5.1 General . 14
4.7.5.2 Sinusoidal output voltage waveform requirements . 14
4.7.5.3 Non-sinusoidal output waveform requirements . 14
4.7.5.4 Information requirements for non-sinusoidal waveforms . 14
4.7.5.5 Output voltage waveform requirements for inverters for
dedicated loads . 15
4.8 Additional tests for grid-interactive inverters . 15
4.8.1 General requirements regarding inverter isolation and array
grounding . 15
4.8.2 Array insulation resistance detection for inverters for ungrounded and
functionally grounded arrays . 17
4.8.2.1 Array insulation resistance detection for inverters for
ungrounded arrays . 17
4.8.2.2 Array insulation resistance detection for inverters for
functionally grounded arrays . 17
4.8.3 Array residual current detection . 18
4.8.3.1 General . 18
4.8.3.2 30 mA touch current type test for isolated inverters . 19
4.8.3.3 Fire hazard residual current type test for isolated inverters . 19
4.8.3.4 Protection by application of RCD’s . 19
4.8.3.5 Protection by residual current monitoring . 19
4.8.3.6 Systems located in closed electrical operating areas . 22
5 Marking and documentation . 22
5.1 Marking . 23

62109-2  IEC:2011 – 3 –
5.1.4 Equipment ratings. 23
5.2 Warning markings . 23
5.2.2 Content for warning markings . 23
5.2.2.6 Inverters for closed electrical operating areas . 24
5.3 Documentation . 24
5.3.2 Information related to installation . 24
5.3.2.1 Ratings . 24
5.3.2.2 Grid-interactive inverter setpoints . 25
5.3.2.3 Transformers and isolation . 25
5.3.2.4 Transformers required but not provided. 25
5.3.2.5 PV modules for non-isolated inverters . 25
5.3.2.6 Non-sinusoidal output waveform information . 25
5.3.2.7 Systems located in closed electrical operating areas . 26
5.3.2.8 Stand-alone inverter output circuit bonding . 26
5.3.2.9 Protection by application of RCD’s . 26
5.3.2.10 Remote indication of faults . 26
5.3.2.11 External array insulation resistance measurement and
response . 26
5.3.2.12 Array functional grounding information . 26
5.3.2.13 Stand-alone inverters for dedicated loads . 27
5.3.2.14 Identification of firmware version(s) . 27
6 Environmental requirements and conditions. 27
7 Protection against electric shock and energy hazards . 27
7.3 Protection against electric shock . 27
7.3.10 Additional requirements for stand-alone inverters . 27
7.3.11 Functionally grounded arrays . 28
8 Protection against mechanical hazards . 28
9 Protection against fire hazards . 28
9.3 Short-circuit and overcurrent protection . 28
9.3.4 Inverter backfeed current onto the array . 28
10 Protection against sonic pressure hazards. 28
11 Protection against liquid hazards . 28
12 Protection against chemical hazards . 28
13 Physical requirements . 29
13.9 Fault indication . 29
14 Components . 29
Bibliography . 30

Figure 20 – Example system discussed in Note 2 above . 11
Figure 21 – Example test circuit for residual current detection testing . 21

Table 30 – Requirements based on inverter isolation and array grounding . 16
Table 31 – Response time limits for sudden changes in residual current . 20
Table 32 – Inverter ratings – Marking requirements . 23
Table 33 –
...