GB/T 39750-2021 PDF English
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| GB/T 39750-2021 | English | 320 |
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Technology requirements of DC arc-fault circuit protection for photovoltaic power system
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GB/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 Contents
Foreword ... 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 system
1 Scope
This 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 references
The 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 units
3 Terms and definitions
For 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.
3.3
4 Basic regulations
4.1 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 equipment
5.1 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 test
7.1 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.
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