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GB/T 39750-2021: Technology requirements of DC arc-fault circuit protection for photovoltaic power system Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 39750-2021: Technology requirements of DC arc-fault circuit protection for photovoltaic power system---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT39750-2021 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 27.160 F 12 Technology requirements of DC arc-fault circuit protection for photovoltaic power system ISSUED ON: MARCH 09, 2021 IMPLEMENTED ON: OCTOBER 01, 2021 Issued by: State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Terms and definitions ... 4 4 Basic regulations ... 6 5 Requirements for protection equipment ... 6 6 Protection methods ... 7 7 Protection test ... 9 Appendix A (Informative) Schematic diagram of arc detection signal channel and photovoltaic string ... 15 Appendix B (Informative) Arc-fault protection equipment ... 17 Appendix C (Informative) Description of applicable protection methods ... 19 Appendix D (Informative) Test system circuit diagram ... 20 Technology requirements of DC arc-fault circuit protection for photovoltaic power system1 ScopeThis Standard specifies the basic provisions, protection equipment requirements, protection methods and protection tests for DC arc-fault circuit protection for photovoltaic power system. This Standard applies to DC-side arc-fault protection for photovoltaic power systems integrated with buildings.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 14048.3, Low-voltage switchgear and controlgear - Part3: Switches, disconnectors, switch-disconnectors and fuse-combination units3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply. 3.1 arc-fault detector; AFD Device used for detecting arc-fault on the DC side of a photovoltaic power system and issuing fault alarm signals. 3.2 arc-fault interrupter; AFI Device - installed on the DC side of a photovoltaic power system - that receives arc detection signals and implements arc extinguishing functions by means of disconnecting, short-circuiting, or switching. 3.34 Basic regulations4.1 For photovoltaic power systems integrated with buildings, when the maximum system voltage on the DC side is greater than or equal to 80 V, DC arc-fault protection should be provided. 4.2 The DC arc-fault circuit protection equipment for the photovoltaic power system (hereinafter referred to as the protection equipment) shall have an action signal function. The action signal can be continuously issued by the controller or inverter. The arc detection signal channel and the photovoltaic string structure are shown in Appendix A. When the protection equipment does not receive an action signal within 15 seconds, the protection action shall be triggered, and the requirements are as follows: a) In a photovoltaic power system operating in grid connected mode, when the inverter is accidentally disconnected or the main grid voltage is lost, the external action signal shall be interrupted. The external action signal can also be manually interrupted by other switches or monitoring devices (such as fire alarm systems). b) In a photovoltaic power system operating in isolated mode or temporary island state, when the system is shut down, the external action signal shall be interrupted. 4.3 The arc-fault interrupter in the DC arc-fault circuit protection equipment for photovoltaic power systems integrated with buildings shall comply with the fail-safe principle. 4.4 DC arc-fault circuit protection for photovoltaic power systems integrated with buildings can adopt methods such as disconnecting, short-circuiting, switching, or changing the working state of the inverter. Disconnecting, short-circuiting, and switching methods shall meet the requirements of GB/T 14048.3. 4.5 For parallel arcing protection, if there is an insulation monitoring device, it is not necessary to provide an independent parallel arcing protection equipment to the ground. 4.6 The protection equipment shall indicate the type of arc-fault protection equipment, and the switchgear shall clearly indicate the on and off positions.5 Requirements for protection equipment5.1 Protection equipment includes arc-fault detector and arc-fault interrupter. See Appendix B for structures of arc-fault detector and arc-fault interrupter. 5.2 After the protection equipment detects the fault arc and operates, it shall be able to cut off the string where the arc fault occurs and send out a visible alarm signal (local 6.4.1 Changing the inverter working state can achieve arc extinguishing protection through inverter control. 6.4.2 Changing the inverter working state is applicable to series arcing protection. 6.5 Applicable scenarios of protection methods The applicable scenarios of protection methods are shown in Appendix C, and they shall be selected reasonably.7 Protection test7.1 Protection test equipment 7.1.1 General requirements The test system for testing DC arc-fault circuit protection equipment shall include DC power supply, decoupling network, linear impedance network, arc generator, arc protector and other test equipment. The circuit structure diagram is shown in Appendix D. For inverter solutions that require an external DC combiner box, arc tests shall be carried out before and after the combiner box. 7.1.2 DC power supply 7.1.2.1 General requirements The test system shall have a DC power supply, which can be a constant voltage power supply or a photovoltaic array simulation power supply. 7.1.2.2 Constant voltage power supply The constant voltage power supply shall include an additional resistor. The constant voltage power supply is adjusted according to the maximum power point, and the requirements are as follows: a) The constant voltage power supply shall be adjusted according to the open circuit voltage value corresponding to the arc test condition in 7.2; b) The upper limit of the maximum current shall be set to 1.1 times the maximum working current value corresponding to the arc test condition in 7.2; c) The total resistance value and relationship corresponding to the arc test condition in 7.2 are shown in Formula (1). Where: Total resistance ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 39750-2021 be delivered?Answer: The full copy PDF of English version of GB/T 39750-2021 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 39750-2021_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 39750-2021_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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