GB 16926-2009High-voltage alternating current switch-fuse combinations (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

Drafting.

This document supersedes GB/T 16926-2009 "High Voltage AC Load Switches - Fuse Combinations" and is consistent with GB/T 16926-2009.

Compared to previous versions, aside from structural adjustments and editorial changes, the main technical changes are as follows.

---The structure and chapter/section names of the standard have been adjusted in accordance with GB/T 11022-2020;

---The content of "General Terms and Definitions" has been changed (see 3.1, 2009 edition of 3.1);

---The terminology and definitions for "assembly of switchgear and controlgear" have been revised (see 3.2, 2009 edition).

---The terminology and definitions of "components of final assembly" have been changed (see 3.3, 2009 edition of 3.3);

---The following have been removed. "Power operation (load switch)", "Energy storage operation (load switch)", "Expected breaking current", and "Short-circuit making capacity".

Terms and definitions for "melting short-circuit current," "arc time (for one pole or fuse)," and "power dissipation" (see 2009 edition).

Chapter 3);

---The rating "rated transient recovery voltage" has been removed (see section 4.102 of the 2009 edition);

---The "Rated Current and Temperature Rise" section has been changed to "Rated Continuous Current" and its requirements have been revised (see 5.5, 4.4 in the 2009 edition);

---Added the requirement for "rated charge pressure/level for insulation and/or switching" (see 5.12);

---The description of "rated short-circuit making current" has been revised (see 5.102, 4.103 in the 2009 edition);

---The section on "Low Pressure and High Pressure Interlock Devices" has been changed to "Pressure/Level Indicator" and its requirements have been revised (see 6.10, 5.9 of the 2009 edition);

--- The entries in the "Nameplate" section have been modified, adding "Rated charging pressure for operation", "Minimum functional pressure for operation", and "Alarm pressure for operation".

"Force", "Rated charging pressure for insulation", "Minimum working pressure for insulation", "Minimum working pressure for opening and closing", and "Type of fluid for insulation" Type and quality (see Table 1, 2009 edition);

---The requirement of "X-ray emission" has been added (see 6.20);

---The requirement of "corrosion" has been added (see 6.21);

---Added requirements for "insulation and/or opening/closing, operation charging pressure/level" (see 6.22);

---The "Temperature Rise Test" and its requirements have been changed to "Continuous Current Test" and its requirements (see 7.5, 6.5 in the 2009 edition);

---Table 2, "Conditions for Combined and Alternative Test Procedures," has been added (see 7.101.2.2);

---The graphic symbols in Figures 1, 2, and 3 have been changed (see 7.101.2.4, 6.101.1.4 in the 2009 version);

---The "tripping linkage test" has been changed to "mechanical operation test" (see 7.102, 6.102 in the 2009 version);

---The requirements for non-holding destructive discharges in the closing and breaking tests have been revised (see 7.101.4, 2009 edition).

6.101.3);

---Changes have been made to the closing and breaking tests regarding the tests to be performed when using a vacuum interrupter, and to d) have been revised.

Criteria to be met when in doubt (see 7.101.5, 6.101.4 in the 2009 edition);

---Changed the requirements for mechanical vibration testing of fuses when only fuse-load switches are tested (see 7.103, 2009 edition).

6.103);

---Added "Extension of type testing validity" (see 7.105);

---Changes have been made to the mechanical operation tests in the factory testing section regarding applicable tests, etc. (see 8.101, 2009 edition)

---The requirements for data regarding the extension of type testing validity have been changed (see 10.3, 9.2 of the 2009 version);

---A normative appendix, "Tolerances for Test Parameters in Type Testing," has been added (see Appendix A).

This document is modified to adopt IEC 62271-105:2021 "High voltage switchgear and controlgear - Part 105: Voltage ratings of 1 kV and above".

AC load switch-fuse combination appliances of 52kV and below.

Compared with IEC 62271-105:2021, this document has undergone the following structural adjustments.

---Table 4 of IEC 62271-105:2021 has been deleted, and subsequent table numbers have been moved forward;

---Appendix A corresponds to Appendix C of IEC 62271-105:2021;

---Appendix B corresponds to Appendix A of IEC 62271-105:2021;

---Appendix C corresponds to Appendix B of IEC 62271-105:2021.

The technical differences between this document and IEC 62271-105:2021 and the reasons therefor are as follows.

---The scope of Chapter 1 has been revised in accordance with the requirements of GB/T 1.1-2020, changing the applicable frequency from "50Hz or 60Hz".

The frequency was changed to "50Hz", and the rated voltage was changed from "above 1kV and below 52kV" to "above 3.6kV and below 40.5kV" (see...).

Chapter 1).

---Regarding normative references, this document has made adjustments to reflect technical differences in order to adapt to my country's technical conditions. Specific adjustments are detailed below.

as follows.

- IEC 62271-102:2018 has been replaced with GB/T 1985-2023, which adopts the international standard (see Chapter 1 and...).

7.101.5);

- IEC 62271-103:2021 has been replaced with GB/T 3804-2017, which adopts the international standard, and the original text has been updated.

The referenced standard is IEC 62271-103:2021 (see Chapter 1, 7.1.1, 7.101.3, 7.102, 9.101.1, 10.2 and...).

- IEC 62271-1:2017 has been replaced with GB/T 11022-2020, which adopts the international standard, and the original text has been updated.

The referenced standards are IEC 62271-1:2017 and AMD1.2021 (see Chapters 3-13);

- IEC 60282-1:2020 has been replaced with GB/T 15166.2-2023, which adopts the international standard (see Chapter 1, 5.101).

5.102, 6.101, 6.102, 7.1, 7.2, 7.5, 7.101.2, 7.101.3, 7.101.5, 7.102, 7.104, 7.105 and Appendix A);

- GB/T 15166.6-2023 (see 9.101.1) has been added as a reference.

---Based on the actual needs of nameplate information in my country, "rated short-circuit breaking current" and "rated short-circuit closing current" have been added to Table 1 "Nameplate Information".

Information on "combined current", "rated transfer current" and "rated transfer current", as well as footnote b (see Table 1).

---Based on the actual requirements of Chinese standards, Chapter 7, "Type Testing," has been amended to include the verification test items required in section c) and applicable tests.

Conditions for conducting type testing (see 7.1.1).

---Figures 1, 2, and 3 have been modified in accordance with domestic graphic symbol requirements (see Figures 1, 2, and 3).

---Table 4 "Testing methods based on US practice" in IEC 62271-105:2021, which is irrelevant to my country's actual situation, has been deleted.

The expected standard value of TRV for the TDItransfer load circuit.

---The symbol for the transformer short-circuit impedance percentage in formula (1) of 9.101.3 has been modified in accordance with the requirements of domestic graphic symbols.

(See 9.101.3).

The following editorial changes have been made to this document.

---To align with my country's standards system, the standard name has been changed to "High Voltage AC Load Switch-Fuse Combination Appliance";

---The term "short-circuit closing capability" that was not used in the text has been removed;

---Version 5.5 added notes to the interpretation of the R10 number system;

---Note 1 in version 5.101 has been deleted;

According to the value;

---GB/T 17467-2020 replaces the informative reference IEC 62271-202.

Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.

This document was proposed by the China Electrical Equipment Industry Association.

This document is under the jurisdiction of the National Technical Committee on Standardization of High Voltage Switchgear (SAC/TC65).

1 Scope

This document defines the terms and definitions for high-voltage AC load switch-fuse combination appliances (hereinafter referred to as "combination appliances"), and stipulates...

This document applies to functional circuit breakers or isolating load switches and current-limiting fuses used in public and industrial power distribution systems.

The combined three-electrode unit can be designed to.

---Interrupts any current up to and including the rated short-circuit breaking current at rated voltage;

---Close at rated voltage until maximum expected peak current.

This document applies to combined electrical appliances with rated voltages of 3.6kV to 40.5kV used in three-phase AC systems with a frequency of 50Hz.

In this document, the term "combination" means that the components of a combined electrical appliance constitute a functional unit. A given type of load switch...

A type of load switch-fuse combination appliance is defined by combining it with a given type of fuse. Different types of fuses can be used...

Combined with a type of load switch, they form a series of combined electrical appliances with different characteristics, especially different rated continuous currents.

Therefore, load switch-fuse combination appliances are characterized by their model number and a range of alternative fuses (i.e., "reference") determined by the manufacturer.

The list of fuses is used to determine this. A combination of electrical appliances conforming to a given type in this document means that each combination uses any of the alternative fuses.

All electrical appliances can prove that they comply with this document.

The fuse is installed to increase the short-circuit rating of the combined electrical appliance, exceeding the short-circuit rating when using a load switch alone.

The installation of an impactor serves two purposes. firstly, to automatically separate the three poles of the load switch by relying on the action of the fuse; and secondly, to ensure that the fault current exceeds the minimum melting current.

Operate correctly when the current is less than the minimum breaking current of the fuse. In addition to the fuse striker, the switchgear can also be equipped with overcurrent trip units or connected in parallel.

Trip unit.

Note. In this document, the term "fuse" refers to a fuse or fusible element unless it would cause ambiguity in the text.

For fuses, see GB/T 15166.2-2023.

Considering the current-limiting function of fuses, in addition to short-time current and short-circuit closing requirements, load switches, including their specific operating mechanisms, see [reference needed].

GB/T 3804-2017.

In addition, load switches that include other functions (not included in GB/T 3804-2017) comply with their relevant standards (e.g..

Disconnecting switches and grounding switches (GB/T 1985-2023).

This document does not apply to combinations of fuses with circuit breakers, contactors, or line load switches, nor to combinations of motor circuits.

This device is not yet suitable for combined electrical appliances that include a single capacitor bank load switch.

Devices that rely on manual operation are not within the scope of this document.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 1984-2024 High-voltage AC circuit breakers (IEC 62271-100:2021, MOD) Note. There are no technical differences between the content referenced in GB/T 1984-2024 and the content referenced in IEC 62271-100:2021.

GB/T 1985-2023 High-voltage AC disconnecting switches and grounding switches (IEC 62271-102:2022, MOD)