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BSI PD IEC TR 63227:2020

BSI PD IEC TR 63227:2020

$167.15

Lightning and surge voltage protection for photovoltaic (PV) power supply systems

Published By Publication Date Number of Pages
BSI 2020 42
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This document deals with the protection of PV power supply systems against detrimental effects of lightning strikes and surge voltages of atmospheric origin. In the event that a lightning and/or surge voltage protection is required to be erected, this document describes requirements and measures for maintaining the safety, functionality, and availability of the PV power supply systems.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 CONTENTS
6 FOREWORD
8 1 Scope
2 Normative references
9 3 Terms and definitions
10 4 Design principles
4.1 Causes of damage and damages
4.2 Galvanic coupling
11 4.3 Magnetic field coupling
Figures
Figure 1 – Examples of direct-axis components of voltage for galvanic coupling
12 4.4 Electric field coupling
4.5 Risk management
Figure 2 – Voltages induced in loops by the steepness of the lightning current
13 5 Lightning protection system (LPS)
5.1 General
Figure 3 – High resolution full climatology (HRFC)
14 5.2 External lightning protection
Figure 4 – Example for the design of the air-termination systemfor a PV power supply system using the rolling sphere method
15 Figure 5 – Maintaining the separation distance
16 5.3 Internal lightning protection
Figure 6 – Example for the design of the air-termination systemfor a PV power supply system
17 5.4 Lightning equipotential bonding
5.5 Lightning protection zone concept
5.6 Selection of surge protective devices (SPDs)
5.6.1 General
18 Figure 7 – Use of SPDs in PV power supply systems
Tables
Table 1 – Selection of the SPD test class (type) and minimumcross-section of the equipotential bonding
19 Figure 8 – Situation A) The surge voltage protection concept for a PV power supply system on a building without external lightning protection
Figure 9 – Situation B) Surge voltage protection conceptfor a PV power supply system on a building with externallightning protection, the separation distance s is maintained
20 Figure 10 – Situation C) Surge voltage protection concept for a PV powersupply system on a building with external lightning protection,the separation distance s is not maintained
Figure 11 – Situation C) Surge voltage protection concept for a PV power supply system on a building with external lightning protection, the separation distance s is not maintained, use of a shield able to carry the lightning current
22 Figure 12 – Flow chart for the selection of protective measures
23 5.6.2 Class I tested SPD, lightning current-carrying capacity Iimp
Table 2 – Selection of the minimum discharge capacity of voltage limiting SPDsof Class I tested (voltage limiting type) or combined SPDs of Type 1(series connection of voltage limiting type and voltage switching type)
24 Figure 13 – Example of a structure with two down-conductorsof the external lightning protection system
Table 3 – Selection of the minimum discharge capacity of voltage switchingclass I tested SPDs (voltage switching) or combined class I tested SPDs(parallel connection of voltage limiting and voltage switching)
25 5.6.3 Class II tested SPD, nominal impulse discharge surge current In
5.7 Coordination of surge protective devices
5.8 Selection of surge protective devices for a functionally earthed line conductor
6 Routing and shielding of cables/lines
26 Figure 14 – Reduction of the effects of induction by shielding and line routing
27 7 Functional earthing/lightning equipotential bonding
Figure 15 – Example for the shielding of the generator main linesby closed metal cable channels
28 8 Inspection and documentation
Figure 16 – Functional earthing of the module racks in case no external lightning protection is available or the separation distance is not maintained
Figure 17 – Lightning equipotential bonding at the module racksin case the separation distance is not maintained
29 Annex A (informative) Shadowing
Figure A.1 – Shadowing of a PV module by a lightning rod
30 Figure A.2 – Minimum distance between the lightning rod or lightning line and the PV module required to prevent an umbra
Table A.1 – Minimum distance of air-termination systems required to avoid an umbra
31 Annex B (informative) Tracking PV power supply system –External lightning protection/down-conductors
32 Annex C (informative)Practical example: lightning protection for a PV powersupply system installed on a saddle roof building
Figure C.1 – Saddle roof building – Meshed air-termination systems of lightning protection level III, the PV power supply system spans several meshes
33 Figure C.2 – Example for the calculation of the separationdistances for lightning protection level III
34 Annex D (informative) PV power supply system as a free-field system
D.1 General
D.2 Earth screw foundations
35 D.3 Plate and strip or ring foundations
Figure D.1 – Connection of module tables to the earthing systemfor pile-driven foundations and earth screw foundations
36 D.4 Lightning current-carrying capacity of Class I tested SPDs for free-field systems
Figure D.2 – Connection of module tables to the earthing system for strip foundations
37 Figure D.3 – Earthing concept and arrangement of the SPDs for a free field
Table D.1 – Minimum discharge capacity of voltage limiting or combinedClass I tested SPDs and voltage switching type class I tested SPDs
38 Annex E (informative)Metal roof and metal façade
E.1 Metal roof
E.2 Metal façades
40 Bibliography

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BSI PD IEC TR 63227:2020
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