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eLibrary > 24/30499547 DC BS EN IEC 62548-1/AMD1 Amendment 1. Photovoltaic (PV) arrays - Part 1. Design requirements >

24/30499547 DC BS EN IEC 62548-1/AMD1 Amendment 1. Photovoltaic (PV) arrays - Part 1. Design requirements, 2024

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24/30499547 DC BS EN IEC 62548-1/AMD1 Amendment 1. Photovoltaic (PV) arrays - Part 1. Design requirements, 2024

82_2297e_CD.pdf [Go to Page]
CONTENTS
FOREWORD
1 Scope
2 Normative references
3 Terms, definitions, symbols and abbreviated terms [Go to Page]
3.1 Terms and definitions
3.2 Symbols
3.3 Abbreviated terms
4 Compliance with IEC 60364 series
5 PV array system configuration [Go to Page]
5.1 General [Go to Page]
5.1.1 Functional configuration of a PV system
5.1.2 PV system topologies
5.1.3 Array electrical diagrams
5.1.4 Use of PCE with multiple DC inputs [Go to Page]
5.1.4.1 General
5.1.4.2 PCEs with DC-DC converters on the PV inputs
5.1.4.3 PCEs with multiple inputs internally connected together in the PCE
5.1.5 PV arrays using DCUs
5.1.6 Series-parallel configuration
5.1.7 Batteries in systems
5.1.8 Backfeed and reverse currents
5.1.9 Considerations due to prospective fault current conditions within a PV array
5.1.10 Considerations due to operating temperature
5.1.11 Performance issues
5.1.12 Potential induced degradation
5.1.13 Corrosion
5.1.14 Mechanical design [Go to Page]
5.1.14.1 General
5.1.14.2 Thermal aspects
5.1.15 Mechanical loads on PV structures [Go to Page]
5.1.15.1 General
5.1.15.2 Mounting structures
5.1.15.3 Wind [Go to Page]
5.1.15.3.1 General
5.1.15.3.2 Use outside of typical applications requiring further analysis
5.1.15.4 Material accumulation on PV array
6 Safety issues [Go to Page]
6.1 General
6.2 Protection against electric shock [Go to Page]
6.2.1 General
6.2.2 Protective measure: double or reinforced insulation
6.2.3 Protective measure: extra-low-voltage provided by SELV or PELV
6.3 Protection against thermal effects [Go to Page]
6.3.1 General
6.3.2 Protection against fire caused by arcs
6.3.3 Protection against arc flash
6.4 Protection against the effects of insulation faults [Go to Page]
6.4.1 General
6.4.2 Segregation of PV circuits from other circuits
6.4.3 Earth fault detection and indication requirements [Go to Page]
6.4.3.1 General [Go to Page]
6.4.3.1.1 Overview
6.4.3.1.2 Systems with more than one sub-array
6.4.3.1.3 Separated sub-arrays
6.4.3.1.4 Non-separated sub-arrays
6.4.3.2 Array insulation resistance detection
6.4.3.3 Shock hazard protection by a residual or earth current monitoring system [Go to Page]
6.4.3.3.1 General
6.4.3.3.2 Provisions for reset
6.4.3.4 Fire hazard protection by a residual or earth current monitoring system
6.4.3.5 Fire hazard protection by an overcurrent device in the PV array functional earthing path
6.4.3.6 Earth fault indication
6.5 Protection against overcurrent [Go to Page]
6.5.1 General
6.5.2 Requirement for overcurrent protection
6.5.3 Requirements for overcurrent protection of circuits [Go to Page]
6.5.3.1 Strings
6.5.3.2 Sub-arrays
6.5.3.3 Array
6.5.4 Overcurrent protection for PV systems connected to batteries
6.5.5 Overcurrent protection location
6.6 Protection against effects of lightning and overvoltage [Go to Page]
6.6.1 General
6.6.2 Protection against overvoltage [Go to Page]
6.6.2.1 General
6.6.2.2 Risk assessment for lightning transient overvoltage
6.6.2.3 Surge protection devices (SPDs) [Go to Page]
6.6.2.3.1 General
6.6.2.3.2 Surge protection devices (SPDs) DC
6.6.2.3.3 Surge protection devices (SPDs) information technology equipment
7 Selection and erection of electrical equipment [Go to Page]
7.1 General
7.2 Component requirements [Go to Page]
7.2.1 General
7.2.2 Current rating of PV circuits
7.2.3 PV modules [Go to Page]
7.2.3.1 Operational conditions and external influences
7.2.3.2 Equipment class
7.2.3.3 Additional standards for PV modules
7.2.4 PV array and PV string combiner boxes [Go to Page]
7.2.4.1 Environmental effects
7.2.4.2 Location of PV array and PV string combiner boxes
7.2.5 Fuses [Go to Page]
7.2.5.1 Accessibility
7.2.5.2 Fuse links
7.2.5.3 Fuse bases and fuse holders
7.2.6 Circuit breakers used for overcurrent protection
7.2.7 Isolation means and isolation means with breaking capabilities [Go to Page]
7.2.7.1 General
7.2.7.2 Switch-disconnector
7.2.7.3 Circuit breakers used for isolation
7.2.7.4 Isolation means with breaking capabilities incorporated in PCEs [Go to Page]
7.2.7.4.1 General
7.2.7.4.2 Isolation means with breaking capabilities using electronics
7.2.8 Cables [Go to Page]
7.2.8.1 Size [Go to Page]
7.2.8.1.1 General
7.2.8.1.2 Current carrying capacity (CCC)
7.2.8.2 Type
7.2.8.3 Erection method
7.2.9 Plugs, sockets and connectors in PV circuits
7.2.10 Wiring in combiner boxes
7.2.11 Bypass diodes
7.2.12 Blocking diodes
7.2.13 Power conversion equipment (PCE) including DC conditioning units (DCUs)
7.3 Location and installation requirements [Go to Page]
7.3.1 Isolation means [Go to Page]
7.3.1.1 General
7.3.1.2 Isolation means for power conversion equipment (PCE)
7.3.2 Earthing and bonding arrangements [Go to Page]
7.3.2.1 General
7.3.2.2 Bonding conductor size – separated systems
7.3.2.3 Separate earth electrode
7.3.2.4 Equipotential bonding [Go to Page]
7.3.2.4.1 General
7.3.2.4.2 PV array bonding conductors
7.3.2.4.3 Functional earthing terminal of PV array
7.3.2.4.4 Functional earthing conductor of PV array
7.3.3 Wiring system [Go to Page]
7.3.3.1 General
7.3.3.2 Compliance with wiring standards
7.3.3.3 Wiring loops
7.3.3.4 String wiring
7.3.3.5 Wiring of enclosures
7.3.3.6 Wiring identification
8 Acceptance
9 Operation/maintenance
10 Marking and documentation [Go to Page]
10.1 Equipment marking
10.2 Requirements for signs
10.3 Identification of a PV installation
10.4 Labelling of PV array and PV string combiner boxes
10.5 Labelling of isolation means [Go to Page]
10.5.1 General
10.5.2 PV array isolation means with breaking capabilities
10.6 Warning sign for anti-PID equipment
10.7 Documentation
Annex A (informative) Examples of signs
Annex B (informative) Examples of system earthing configurations in PV arrays
Annex C (informative) Blocking diode [Go to Page]
C.1 General
C.2 Use of blocking diodes to prevent overcurrent/fault current in arrays
C.3 Examples of blocking diode use in fault situations [Go to Page]
C.3.1 General
C.3.2 Short circuit in PV string
C.4 Specification of blocking diode
C.5 Heat dissipation design for blocking diode
Annex D (informative) Arc fault detection and interruption in PV arrays
Annex E (normative) DVC limits
Annex F (normative) Determination of maximum voltage and maximum currents in PV circuits [Go to Page]
F.1 UOC MAX [Go to Page]
F.1.1 PV array maximum voltage
F.1.2 PV strings constructed using DC conditioning units
F.2 String maximum current
F.3 Calculation of potential fault currents originating from the array [Go to Page]
F.3.1 General
F.3.2 String
F.3.3 Sub-array
F.3.4 Array
F.4 KI factor – general
F.5 KCorr factor – under unique environmental conditions
F.6 KCorr factor – non optimally oriented monofacial arrays
F.7 KCorr factor – bifacial arrays
F.8 KCorr factor – for arrays containing non-optimally oriented bifacial modules
Annex G (normative) Backfeed current and PV reverse currents under fault conditions [Go to Page]
G.1 General
G.2 Illustrated examples
G.3 Backfeed currents and PV reverse currents where subarrays are not combined in the PCE
Annex H (normative) Anti-PID [Go to Page]
H.1 General
H.2 DC bias applied during night
H.3 DC bias applied to array output
H.4 DC bias applied to AC system
Annex I (informative) Arc flash
Annex J (normative) Qualification of DCU group voltage [Go to Page]
J.1 Overview
J.2 Test 1: Maximum voltage operational test procedure
J.3 Test 2: Overvoltage test
Bibliography [Go to Page]

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