GB/T 18802.31-2021Low-voltage surge protective devices—Part 31: Surge protective devices connected to photovoltaic installations—Requirements and test methods (English PDF)

Foreword

The structure and name of the "Low-voltage surge protective devices (SPD)"

series of standards are as follows.

- GB 18802.1 Low-voltage surge protective devices - Part 1.Surge protective

devices connected to low-voltage power distribution systems -

Requirements and tests;

- GB/T 18802.12 Low-voltage surge protective devices - Part 12.Surge

protective devices connected to low-voltage power distribution systems -

Selection and application principles;

- GB/T 18802.21 Low-voltage surge protective devices - Part 21.Surge

protective devices connected to telecommunications and signaling

networks - Performance requirements and testing methods;

- GB/T 18802.22 Low-voltage surge protective devices - Part 22.Surge

protective devices connected to telecommunications and signaling

networks - Selection and application principles;

- GB/T 18802.31 Low-voltage surge protective devices - Surge protective

devices for specific application including d.c. - Part 31.Requirements and

tests for SPDs in photovoltaic applications;

- GB/T 18802.311 Components for low-voltage surge protective - Part 311.

Specification for gas discharge tubes (GDT);

- GB/T 18802.321 Components for low-voltage surge protective devices -

Part 321.Specifications for avalanche breakdown diode (ABD);

- GB/T 18802.331 Components for low-voltage surge protective devices -

Part 331.Specification for metal oxide varistors (MOV);

- GB/T 18802.341 Components for low-voltage surge protective devices -

Part 341.Specification for thyristor surge suppressors (TSS).

This part was drafted in accordance with the rules given in GB/T 1.1-2009.

This part was proposed by China Electrical Equipment Industry Association.

This part shall under the jurisdiction of the National Lightning Protection

Standardization Technical Committee (SAC/TC 81).

Responsible drafting organizations of this part. Shanghai Lightning Protection

Center, Xi'an High Voltage Electric Apparatus Research Institute Co., Ltd.

Low-voltage surge protective devices - Surge

protective devices for specific application including

d.c. - Part 31.Requirements and tests for

SPDs in photovoltaic applications

1 Scope

This part specifies the performance requirements and test methods for SPDs

installed on the DC side of a photovoltaic system. This type of SPD is used to

reduce the impact of lightning induction or direct lightning on the DC side of

photovoltaic power generation equipment. These appliances will be connected

to the DC power circuit of a photovoltaic power generation equipment which

has a rated voltage not exceeding 1500 V.

This part considers the following characteristics of photovoltaic power

generation equipment.

- Characteristics similar to current sources;

- The nominal current depends on the light intensity;

- The short-circuit current is almost equal to the nominal current;

- Output various sizes of voltage, current and power in series and/or parallel

combination, from several hundred watts (civil facilities) to several

megawatts (photovoltaic field).

The very special electrical parameters on the DC side of the photovoltaic

equipment place special test requirements on the SPD.

SPD with special series impedance between separate input and output

terminals (so-called two-port SPD in EN 61643-11) are not currently fully

covered by the performance requirements of this standard, which require

additional consideration.

Note. For SPD used in photovoltaic systems, for power efficiency

considerations, special series impedances are typically not included between

the input and output terminals.

SPD conforming to this standard are only designed to be installed on the DC

side of a photovoltaic generator. Regardless of photovoltaic equipment

containing battery packs and other DC equipment, it requires additional

requirements and tests for SPDs used in this equipment.

For SPD where the manufacturer states that the overload characteristic is short-

circuit mode, special measures must be required to prevent the DC arc that

may be generated during the maintenance and replacement of such SPD from

jeopardizing the operator.

2 Normative references

The following documents are essential to the application of this document. For

the dated documents, only the versions with the dates indicated are applicable

to this document; for the undated documents, only the latest version (including

all the amendments) are applicable to this standard.

GB/T 2900.83-2008 Electrotechnical terminology - Electrical and magnetic

devices (IEC 60050-151.2001, IDT)

HD 588.1 S1.1991 High-voltage test techniques - Part 1.General definitions

and test requirements, IEC 60060-1.1989 + corrigendum Mar, IEC 60060-