BS IEC 61643-32:2017:2019 Edition
$189.07
Low-voltage surge protective devices – Surge protective devices connected to the d.c. side of photovoltaic installations. Selection and application principles
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 46 |
This part of IEC 61643 describes the principles for selection, installation and coordination of SPDs intended for use in Photovoltaic (PV) systems up to 1 500 V DC and for the AC side of the PV system rated up to 1 000 V rms 50/60 Hz.
The photovoltaic installation extends from a PV array or a set of interconnected PV-modules to include the associated cabling and protective devices and the inverter up to the connection point in the distribution board or the utility supply point.
This part of IEC 61643 considers SPDs used in different locations and in different kinds of PV systems:
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PV systems located on the top of a building.
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PV systems located on the ground like free field power plants characterized by multiple earthing and a meshed earthing system.
The term PV installation is used to refer to both kinds of PV systems. The term PV power plant is only used for extended free-field multi-earthed power systems located on the ground.
For PV installations including batteries additional requirements may be necessary.
NOTE 1 IEC 60364 series, IEC 62305 series and IEC 61643-12 also apply.
NOTE 2 This standard deals only with SPDs and not with surge protective components integrated inside equipment (e.g. inverters, (PCE) power conversion equipment).
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 4 | English CONTENTS |
| 6 | FOREWORD |
| 8 | INTRODUCTION |
| 9 | 1 Scope 2 Normative references |
| 10 | 3 Terms and definitions |
| 14 | 4 Systems and equipment to be protected 5 Overvoltages in a PV installation |
| 15 | 6 Installation and location of SPDs 6.1 General |
| 16 | Tables Table 1 – Selection of SPD test class and cross section of bonding conductor |
| 17 | 6.2 Requirements for different PV installations: 6.2.1 PV installation without an external LPS Figures Figure 1 – Installation of SPDs in the case of a building without an external LPS |
| 18 | 6.2.2 PV installation with an external LPS when the separation distance (s) is maintained (excluding multi-earthed solar systems, such as PV power plants) Figure 2 – Installation of SPDs in the case of a PV installation with an external LPS where the separation distance (s) is maintained |
| 19 | 6.2.3 PV installation with an external LPS where the separation distance (s) cannot be maintained (including multi-earthed systems, such as PV power plants) Figure 3 – Installation of SPDs in the case of a PV-installation with an external LPS where the separation distance (s) cannot be maintained |
| 20 | 6.2.4 PV installation including communication and signalling circuits 7 Equipotential bonding |
| 21 | 8 Requirements for the installation of surge protective devices (SPDs) in a PV system 9 Selection and installation of SPDs in PV installations 9.1 Selection of SPDs on the AC side 9.1.1 General 9.1.2 Selection of SPDs with regard to nominal discharge current In and impulse current Iimp |
| 22 | 9.1.3 Selection of SPDs with regard to voltage protection level UP 9.1.4 Installation of SPDs on the AC side |
| 23 | Figure 4 – Installation of SPDs on the AC side with a short distance between the origin of the installation and the PV inverter (E < 10 m) Figure 5 – Installation of SPDs on the AC side with a long distance between the origin of the installation and the PV inverter (E ≥ 10 m) |
| 24 | 9.2 Selection of SPDs installed on the DC side 9.2.1 General 9.2.2 Selection of SPDs with regard to nominal discharge current In and impulse current Iimp 9.2.3 Selection of UCPV of SPDs on the DC side 9.2.4 Selection of SPDs with regard to voltage protection level Up |
| 25 | 9.2.5 Installation of SPDs on the DC side Table 2 – Rated impulse voltage Uw for equipment between PV array and inverter (where no other information is available) |
| 26 | 9.2.6 Cross-sections of connecting conductors for SPDs on the DC side Figure 6 – Example of overvoltage protection on the DC side of a PV installation |
| 27 | 9.2.7 Internal connection schemes of multipole SPDs or combinations of SPDs with a single mode of protection on the DC side Figure 7 – Example of SPD connections on the DC side of an unearthed PV source |
| 28 | 9.2.8 Selection of ISCPV of SPDs on the DC side Figure 8 – Example of SPD connection on the DC side of a reliable earthed PV source |
| 29 | 9.2.9 Coordination of SPDs 10 Maintenance |
| 30 | Annex A (normative) Determination of the value of Iimp or In for SPDs according to the simplified approach for different structures protected by an LPS A.1 General |
| 31 | A.2 Building with a PV installation on the roof according to 6.2.3 |
| 32 | Figure A.1 – Example of a structure with two external down conductors to determinethe value of the discharge current for the selection of SPDs |
| 33 | Table A.1 – Values of Iimp (I10/350) and In (I8/20) for voltage-limiting SPDs on the DC side of a PV installation mounted on the roof of a building with an external LPS if the separation distance is not maintained Table A.2 – Values of Iimp (I10/350) for voltage-switching SPDs on the DC side of a PV installation mounted on the roof of a building with an external LPS, if the separation distance is not maintained |
| 34 | A.3 Free- field PV power plant |
| 35 | Figure A.2 – Example of the structure of an extended PV installation. A PV power plant with multiple earthing and a meshed earthing system Table A.3 – Values of Iimp (I10/350) and In (I8/20) for SPDs used on the DC side in PV power plants with a central inverter, multiple earthing and a meshed earthing system |
| 37 | Annex B (informative) Characteristics of a PV source B.1 PV source characteristics Figure B.1 – Schematic of a PV current source Figure B.2 – U/I characteristics of a non-linear PV current source |
| 38 | B.2 Calculation of UOC MAX |
| 39 | B.3 Calculation of ISC MAX |
| 40 | Annex C (informative) Additional information to clause 6: Installation and location of SPD and to clause 7: Equipotential bonding C.1 PV installation including communication and signalling circuits |
| 41 | Figure C.1 – Example of SPDs installed on a PV system protected by an external LPS where the separation distance (s) is maintained – Installation includes data acquisition and control system |
| 42 | C.2 PV installation and dimensions of equipotential bonding conductors Figure C.2 – Example of a building with an external LPS – Dimensions of equipotential bonding conductors when the separation distance (s) is maintained, or an isolated LPS is used |
| 43 | Figure C.3 – Example of a building with an external LPS – Dimensions of equipotential bonding conductors when the separation distance (s) is not maintained |
| 44 | Annex D (informative) Exceptions in the USA related to Class I tested SPDs |
| 45 | Bibliography |
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