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GB/T 18802.32-2021 English PDF

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GB/T 18802.32-2021: Low-voltage surge protective devices - Part 32: Surge protective devices connected to photovoltaic installations - Selection and application principles
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Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 18802.32-2021	724	Add to Cart	5 days	Low-voltage surge protective devices - Part 32: Surge protective devices connected to photovoltaic installations - Selection and application principles	Valid

Similar standards

GB/T 16935.3 GB/T 16935.4 GB/T 16935.5 GB/T 18802.12 GB/T 18802.31 GB/T 18802.22

Basic data

Standard ID: GB/T 18802.32-2021 (GB/T18802.32-2021)
Description (Translated English): Low-voltage surge protective devices - Part 32: Surge protective devices connected to photovoltaic installations - Selection and application principles
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: K30
Word Count Estimation: 38,364
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 18802.32-2021: Low-voltage surge protective devices - Part 32: Surge protective devices connected to photovoltaic installations - Selection and application principles

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Low-voltage surge protective devices - Part 32.Surge protective devices connected to photovoltaic installations - Selection and application principles ICS 29.240.10 K30 National Standards of People's Republic of China Low voltage surge protector Part 32.Surge protectors for photovoltaic systems Guidelines for selection and use (IEC 61643-32.2017,Low-voltagesurgeprotectivedevices- Released on 2021-03-09 Implemented on 2021-10-01 State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee

Foreword Ⅲ Introduction Ⅴ 1 Scope 1 2 Normative references 1 3 Terms and definitions 2 4 Protected systems and equipment 5 5 Overvoltage in photovoltaic system 6 6 SPD installation and location 6 6.1 Overview 6 6.2 Requirements for different photovoltaic systems 7 7 Equipotential bonding 9 8 Requirements for installing surge protectors (SPD) in photovoltaic systems 10 9 Selection and installation of SPD 10 for photovoltaic systems 9.1 Selection of AC side SPD 10 9.2 Selection of DC side SPD 13 10 Maintenance 17 Appendix A (Normative Appendix) Determine the value of Iimp or In of SPD in different buildings protected by the lightning protection system according to the simplified method Appendix B (informative appendix) Characteristics of photovoltaic power supply 24 Appendix C (informative appendix) Additional information in Chapter 6.SPD installation and location; additional information in Chapter 7.Equipotential bonding Reference 30 Figure 1 SPD installation diagram without external LPS 7 Figure 2 Schematic diagram of SPD installation when the photovoltaic system and the external LPS meet the safety separation distance (s) 8 Figure 3 Schematic diagram of SPD installation when the photovoltaic system and the external LPS do not meet the safe separation distance (s) 9 Figure 4 Schematic diagram of installing SPD on the AC side when the distance between the installation starting point and the photovoltaic inverter is very close (E< 10m) 12 Fig. 5 Schematic diagram of installing SPD on the AC side when the distance between the installation starting point and the photovoltaic inverter is far (E≥10m) 12 Figure 6 An example of overvoltage protection on the DC side of a photovoltaic system 15 Figure 7.Example of SPD connection with ungrounded PV DC side 16 Figure 8 Example of SPD connection with reliable grounding on the DC side of photovoltaics 16 Figure A.1 Example of determining the SPD discharge current value in a building with two external down conductors 19 Figure A.2 An example of an extended photovoltaic system structure, a photovoltaic power plant with multiple grounding and mesh grounding systems 22 Figure B.1 Schematic diagram of photovoltaic current source 24 Figure B.2 UI characteristics of non-linear photovoltaic current power supply 24 Figure C.1 An example of an SPD installed on a photovoltaic system protected by an external LPS (satisfying the safe separation distance s), the photovoltaic system includes data Acquisition and control system 27 Figure C.2 Example of a building with an external LPS --- When meeting the safety separation distance s or using isolated LPS, the equipotential bonding conductor Size 28 Figure C.3 Example of a building with external LPS --- When the safe separation distance s is not met, the size of the equipotential bonding conductor 29 Table 1 Selection of SPD test level and cross-sectional area of grounding conductor 6 Table 2 The impulse withstand voltage rating UW of the equipment between the photovoltaic array and the inverter (not considering other influencing factors) 13 Table A.1 Iimp (I10/350) and Iimp (I10/350) of the voltage-limiting SPD on the DC side of the photovoltaic system installed on the roof of a building with an external LPS The value of In(I8/20) (if the separation distance is not satisfied) 20 Table A.2 Iimp (I10/350) of the voltage switch type SPD on the DC side of the photovoltaic system installed on the roof of a building with an external LPS Value (if the separation distance is not maintained) 20 Table A.3 Iimp (I10/350) and SPD used on the DC side of photovoltaic power plants with a central inverter, multiple grounding and mesh grounding systems In (I8/20) value 22 Low voltage surge protector Part 32.Surge protectors for photovoltaic systems Guidelines for selection and use

1 Scope

This part of GB/T 18802 shows that the effective value of the voltage connected to the AC side does not exceed 1000V (50Hz or 60Hz) and the DC side Guidelines for the selection, installation and coordination of SPD for photovoltaic systems with a voltage not exceeding 1500V. The scope of photovoltaic systems extends from photovoltaic arrays or a set of interconnected photovoltaic modules to include related cables, protection devices and inverters. All the way to the connection point of the power distribution cabinet or the public grid connection point. This section considers the following SPDs used in different locations and different types of photovoltaic systems. ---The photovoltaic system located on the top of the building; ---The photovoltaic system located on the ground, similar to the ground power station, is characterized by the use of multi-point grounding and a mesh grounding system. The term "photovoltaic system" is used to refer to the above two photovoltaic systems; the term "photovoltaic power plant" is only used to refer to the Multi-grounded power system. For the protection of photovoltaic systems containing energy storage cells, additional requirements may need to be met. Note 1.GB/T 16895 (all parts), GB/T 21714 (all parts) and IEC 61643-12 are also applicable. Note 2.This section only relates to SPD, and does not involve surge protection components integrated in the device [for example, in the inverter, power conversion equipment (PCE)].

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document. GB/T 16935.1-2008 Insulation coordination of equipment in low-voltage systems Part 1.Principles, requirements and tests (IEC 60664-1. 2007, IDT) GB/T 17626.5-2019 Electromagnetic compatibility test and measurement technology surge (impact) immunity test (IEC 61000-4-5. 2014, IDT) GB/T 21714.3-2015 Lightning Protection Part 3.Physical Damage and Life Danger of Buildings (IEC 62305-3.2010, IDT) IEC 60364-4-44.2007/AMD1.2015 Low-voltage electrical installations Part 4-44.Safety protection against voltage disturbances and electromagnetic disturbances Interference protection (Low-voltage electricalinstalations-Part 4-44.Protectionforsafety-Protectionagainstvolt- agedisturbancesandelectromagneticdisturbances) IEC 60364-5-53.2015 Electrical Installations of Buildings Part 5-53.Selection and Installation of Electrical Equipment-Isolation, Switching and Control Equipment (Electricalinstalationsofbuildings-Part 5-53.Selectionanderectionofelectricalequipment-I- solation,switchingandcontrol) IEC 60364-5-54 Low-voltage electrical installations Part 5-54.Selection and installation of electrical equipment, grounding arrangements and protective conductors (Low-voltageelectricalinstalations-Part 5-54.Selectionanderectionofelectricalequipment- Earthingarrangementsandprotectiveconductors) IEC 60364-7-712.2017 Low-voltage electrical installations Part 7-712.Requirements for special installations or places Volt) power supply system (Lowvoltageelectricalinstalations-Part 7-712.Requirementsforspecialinstalations 3.3 PVstring A circuit of one or more photovoltaic modules connected in series. [IEC 60364-7-712.2017, definition 712.3.3] 3.4 Photovoltaic system PVinstalation The equipment that constitutes the photovoltaic power supply system. [IEC 60364-7-712.2017, definition 712.3.14] 3.5 Origin of the electrical installation point of the electrical installation The point at which electrical energy is fed into electrical equipment. [GB/T 2900.71-2008, definition 826-10-02] 3.6 Lightning protection system; LPS The whole system used to reduce the physical damage caused by lightning strikes to buildings. Note 1.LPS consists of two parts, an external and internal lightning protection system. Note 2.In this section, "buildings" refer to "photovoltaic systems". [GB/T 21714.1-2015, definition 3.42] 3.7 Independent external LPS externalLPSisolatedfromthestructuretobeprotected The air-termination and down-conductor installation positions make the lightning current channel and the LPS not in contact with the building to be protected. Note 1.An independent LPS can avoid dangerous sparks between the LPS and the photovoltaic system. Note 2.In this section, "buildings" refer to "photovoltaic systems". [GB/T 21714.3-2015, definition 3.3] 3.8 Surge protector surgeprotectivedevice; SPD An electrical appliance used to limit transient overvoltage and discharge surge current, which contains at least one non-linear element. Note. SPD has an appropriate connection device and is a fully assembled part. [IEC 61643-11.2011, definition 3.1.1] 3.9 Separation distance The distance so that no dangerous sparks will appear between the two conductors. [GB/T 21714.3-2015, definition 3.27] 3.10 Lightning equipotential bonding EB In order to reduce the potential difference caused by the lightning current, the separated conductive parts are connected to the LPS directly with a conductor or through a surge protector. [GB/T 21714.3-2015, definition 3.22] 3.11 Bondingbar Metal connection bar, metal devices that need to be grounded, external conductive parts, power lines, communication cables and other cables can be connected with LPS connection. [GB/T 21714.3-2015, definition 3.23] 3.12 Bondingconductor A conductor used to connect separate conductive parts with LPS. [GB/T 21714.3-2015,3.24] 3.13 Standard test conditions standardtestconditions; STC Used as a reference condition for photovoltaic cells and modules testing and rating series standards. Note 1.Refer to product standards (such as IEC 61215). Note 2.The standard test conditions for photovoltaic modules given in IEC 61215 are. a) The temperature of the photovoltaic cell is 25℃; b) The plane irradiance of the photovoltaic cell or module is 1000W/m2; c) Atmospheric solar spectrum corresponding to AM1.5. [IEC 60364-7-712.2017, definition 712.3.12] 3.14 Open-circuit voltage under standard test conditions open-circuit voltage under standard test conditions UOC STC No load (open circuit) on the DC side of photovoltaic modules, photovoltaic strings, photovoltaic arrays, photovoltaic inverters or power conversion equipment under standard test conditions Voltage. Note. Rewrite IEC 60364-7-712.2017 and define 712.3.13. 3.15 Maximum open-circuit voltageopen-circuitmaximumvoltage UOC MAX The maximum no-load (open circuit) voltage on the DC side of photovoltaic modules, photovoltaic strings, photovoltaic arrays, photovoltaic inverters, or power conversion equipment. Note. Appendix B gives the calculation method of UOC MAX. 3.16 Short-circuit current under standard test conditions short-circuit current under standard test conditions ISC STC The short-circuit current of photovoltaic modules, photovoltaic strings or photovoltaic arrays under standard test conditions. [IEC 60364-7-712.2017, definition 712.3.15] 3.17 Short-circuit maximum current ISC MAX The maximum current expected to occur when a photovoltaic module, photovoltaic string or photovoltaic array is short-circuited. Note 1.The calculation of ISC MAX is shown in Appendix B. Note 2.Rewrite IEC 60364-7-712.2017 and define 712.3.16. 3.18 Maximum continuous operating voltage for PV application UCPV The maximum DC voltage that can be continuously applied to the SPD protection mode. Note. This value should be greater than or equal to UOC MAX. [GB/T 18802.31-2021, definition 3.1.10] 3.19 SPD's rated short-circuit current short-circuit current rating of the SPD ISCPV The maximum expected short-circuit current rating of the power system that the SPD can withstand after being connected to the designated disconnector. Note. This value should be greater than or equal to ISC MAX. [GB/T 18802.31-2021, definition 3.1.25] 3.20 Open circuit failure mode open-circuit failure mode; OCFM Under certain conditions, SPD becomes a permanent high impedance or failure characteristic of an open circuit state. Note. Before reaching the final failure mode, it may be in a low impedance critical state for a limited time. [GB/T 18802.31-2021, definition 3.1.40] 3.21 Short-circuit failure mode short-circuit failure mode; SCFM Under certain conditions, SPD becomes a permanent low-impedance or short-circuit failure characteristic. [GB/T 18802.31-2021, definition 3.1.41] 3.22 Rated impulse voltage UW The impulse withstand voltage value specified by the manufacturer for the equipment or its components to characterize the ability of its insulation to withstand transient overvoltage. Note 1.This section only considers the withstand voltage between live conductors and ground. Note 2.UW is measured using 1.2/50μs voltage pulse waveform. Note 3.It is also called Uimp in some other standards. Note 4.Rewrite GB/T 16935.1-2008, definition 3.9.2. 3.23 Total discharge current ITotal In the total discharge current test, a multi-pole SPD ground conductor current flows. Note 1.The purpose is to consider the cumulative effect of multiple protection modes of multi-pole SPD working at the same time. Note 2.ITotal is particularly related to the SPD of the Type I test, and is used for lightning equipotential connection in accordance with the relevant parts of GB/T 21714. Note 3.Rewrite IEC 61643-11.2011, definition 3.1.44.

4 Protected systems and equipment

The equipment that may need to be protected in a photovoltaic system includes. ---Inverter, including the interface with the low-voltage AC system and the interface with the DC system; ---PV array; ---The photovoltaic system comes with wiring; ---The components installed between the inverter and the photovoltaic array; ---Equipment used to control and monitor photovoltaic systems. Overvoltage will reduce or destroy the performance of the photovoltaic system or even cause failure, so the photovoltaic system should be protected against overvoltage. To evaluate the necessity of overvoltage protection and to select an appropriate protection method, the manufacturer is required to provide information about the equipment withstand voltage. If the information is not easy to obtain, you can use the equipment impulse withstand voltage rating UW provided in 9.1.2 and Table 2 as a reference. Shunted lightning current It may cause accidental flashover and cause fire. Effective surge protection measures can help reduce the risk of fire (see GB/T 21714 related section). information. The minimum cross-sectional area of the equipotential bonding belt should comply with IEC 60364-5-54, IEC 61643-12 and GB/T 21714.3-2015 Claim. If the equipotential bonding tape is used as a down conductor, its minimum cross-sectional area should be a copper wire of 50mm2, or a conductor with equivalent current-carrying capacity. If the equipotential bonding belt is expected to conduct part of the lightning current, its minimum cross-sectional area should be 16mm2 copper wire, or equivalent current-carrying capacity conductor. If the equipotential bonding belt is expected to only conduct induced lightning current, its minimum cross-sectional area should be 6mm2 copper wire, or equivalent current-carrying capacity conductor. The minimum cross-sectional area of the connecting conductor connecting the conductive parts to the equipotential bonding belt should be 6mm2 copper wire, or equivalent current-carrying capacity conductor. In the case of a photovoltaic system that is not connected to the LPS, the connecting conductors connected to the different connection straps and the conductors connected to the grounding system The minimum cross-sectional area should be 6mm2 copper wire, or equivalent current-carrying conductor. Note. The minimum cross-sectional requirements for conductors are different in some countries, and these differences are explained in GB/T 21714.3-2015. An LPS component that is expected to flow part of the lightning current should comply with IEC 62561 (alparts). When the photovoltaic system is protected by LPS, the minimum safe separation distance between the LPS and the metal structure of the photovoltaic system should be maintained to Prevent part of the lightning current from flowing through these structures, as shown in Figure C.2.The minimum cross-sectional area of all equipotential bonding wires is 6mm2, but the figure Except for the size shown in C.2 (grounding conductor of SPD for Type I test in the main distribution cabinet). If the photovoltaic module is protected by LPS, but the safe separation distance between the two cannot be maintained, the metal of the external LPS and the photovoltaic array should be Increase the direct connection between the structures, this connection should be able to withstand part of the lightning current. The minimum cross-sectional area of the equipotential bonding conductor should be shown in Figure C.3 As shown, and meet the requirements of IEC 60364-5-54, IEC 61643-12 and GB/T 21714.3-2015.Of all equipotential bonding wires The minimum cross-sectional area should be 16mm2, except for the equipotential bonding belt used for inverter grounding, as shown in Figure C.3. 8 Requirements for installing surge protectors (SPD) in photovoltaic systems Unless otherwise stated in the risk assessment, SPD should be installed on the DC side and AC side of the photovoltaic system. For the risk assessment of large-scale photovoltaic systems, IEC 62305-2 is usually used. For the risk assessment of smaller photovoltaic systems, it can be based on For AC side SPD in IEC 61643-31, IEC 60364-4-44.2017/AMD1.2015, Chapter 443, IEC 60364-7-712. Provisions for DC side SPD in.2017. When installing SPD to protect the photovoltaic system, it should also protect the safety of the telecommunication and signal lines that are part of the photovoltaic system. SPD should meet. ---Surge protector for low-voltage AC power system. IEC 61643-11; ---Surge protector for telecommunications and signal networks. IEC 61643-21; ---Surge protector for photovoltaic system. IEC 61643-31. In addition, the selection and installation of SPD should meet the requirements of the following standards. ---IEC 60364-5-53.2015 Chapter 534, IEC 61643-12 and IEC 62305-4 for the protection of AC power systems; ---IEC 61643-22 or IEC 62305-4 for the protection of control and communication systems.

9 Selection and installation of SPD for photovoltaic system

9.1 Selection of AC side SPD 9.1.1 Overview The selection and installation of the SPD used to protect the AC side of the photovoltaic system should follow IEC 60364-5-53.2015 Chapter 534, IEC 61643- 12 and IEC 62305-4.This section only considers some specific details of equipment protection on the AC side of the photovoltaic system. Note. The voltage between ......

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Answer: Upon your order, we will start to translate GB/T 18802.32-2021_English as soon as possible, and keep you informed of the progress. The lead time is typically 3 ~ 5 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 18802.32-2021_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 18802.32-2021_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.