GB/T 19212.24-2020Safety of transformers, reactors, power supply units and combinations thereof - Part 24: Particular requirements and test for transformers and power supply units for construction sites (English PDF)

Foreword

GB/T 19212 "Safety of Transformers, Reactors, Power Supply Devices and Their Combinations" 1) consists of the following parts:

1) In GB/T 19212, some parts are under the heading "Safety of power transformers, power supplies, reactors and similar products", and some parts are Under the heading of 1100V and below the safety of transformers, reactors, power supply units and similar products, some parts are Under the heading of "Safety of Source Device and Its Combination", the title of GB/T 19212 may be revised in the future.

---Part 1. General requirements and tests;

---Part 2. Special requirements and tests for general purpose separating transformers and power supplies with built-in separating transformers;

---Part 3. Special requirements and tests for control transformers and power supplies with built-in control transformers;

---Part 4. Special requirements and tests for ignition transformers for gas and oil burners;

---Part 5. Special requirements and tests for isolation transformers and power supply devices with built-in isolation transformers;

---Part 6. Special requirements and tests for transformers for shavers, power supply devices for shavers, and power supply devices for shavers;

---Part 7. Special requirements and tests for safety isolating transformers and power supply devices with built-in safety isolating transformers;

---Part 8. Special requirements and tests for transformers and power supplies for toys;

---Part 9. Special requirements and tests for transformers and power supply devices for electric bells and electric clocks;

---Part 10. Special requirements and tests for transformers and power supply devices for class III portable tungsten filament lamps;

---Part 11. Special requirements and special requirements for high-insulation level separation transformers and separation transformers with an output voltage exceeding 1000V test;

---Part 13. Special requirements and tests for constant voltage transformers and power supply devices;

---Part 14. Special requirements and tests for autotransformers and power supply devices with built-in autotransformers;

--- Part 15. Special requirements and tests for voltage regulators and power supply devices with built-in voltage regulators;

---Part 16. Special requirements and tests for isolation transformers for power supply in medical places;

---Part 17. Special requirements and tests for switching power supply devices and transformers for switching power supply devices;

---Part 20. Special requirements for interference attenuation transformers;

---Part 21. Special requirements and tests for small reactors;

---Part 24. Special requirements and tests for transformers and power supply devices for construction sites;

--- Part 27. Special requirements and tests for transformers and power supply devices for energy saving and other purposes.

This part is Part 24 of GB/T 19212.

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

This part replaces GB/T 19212.24-2005 "Safety of power transformers, power supply units and similar products Part 24: Construction workers

Compared with GB/T 19212.24-2005, the main technical changes are as follows:

---Modified the scope of regulations (see Chapter 1, Chapter 1 of the 2005 edition);

---Modified the normative references (see Chapter 2, Chapter 2 of the 2005 edition);

---Modified terms and definitions (see Chapter 3, Chapter 3 of the 2005 edition);

---Modified the provisions of the rated value (see Chapter 6, Chapter 6 of the 2005 edition);

---Modified the graphic symbols of the logo and added the provisions of the identification code (see Chapter 8, Chapter 8 of the 2005 edition);

---Modified the change of the input voltage setting value (see Chapter 10, Chapter 10 of the 2005 edition);

---Modified the no-load output voltage regulations (see Chapter 12, Chapter 12 of the 2005 edition);

---Modified the regulations on the structure of Class I transformers, and added the structural requirements for transformers for non-independent use (see Chapter 19, 2005 Chapter 19 of the edition);

--- Deleted Appendix C and Appendix D (see Appendix C and Appendix D of the 2005 edition).

This part uses the redrafting law to amend and adopt IEC 61558-2-23:2010 "Safety of transformers, reactors, power supply devices and their combinations" Part 2-23. Special requirements and tests for transformers and power supply devices for construction sites.

The technical differences between this part and IEC 61558-2-23:2010 and the reasons are as follows:

---Regarding normative reference documents, this section has made adjustments with technical differences to adapt to my country's technical conditions and adjustments. The situation is collectively reflected in Chapter 2 "Normative Reference Documents", and the specific adjustments are as follows:

- The technical differences between GB/T 19212.1-2016 and IEC 61558-1:2009 in Chapter 2 are retained to facilitate the GB/T 19212.1-2016 supporting use;

- Replace IEC 61558-1:2005 with GB/T 19212.1-2016 which is modified to adopt international standards;

- IEC 60439-4 in the original text has been replaced by IEC 61439-4, and the corresponding reference document is changed to GB/T 7251.4 (GB/T 7251.4-2017, IEC 61439:2012, IDT);

- Added reference to IEC 60417-DB (see Chapter 8).

---In the priority value of rated output voltage in Chapter 6 of the original text, for mobile single-phase isolation transformers and other isolation transformers, added "220V", "36V" is added to the safety isolation transformer, in order to meet the actual situation of our country.

This section also made the following editorial changes:

---In order to meet the uniform numbering of the GB/T 19212 series of standards, the standard name is changed to "Transformers, reactors, power supply devices and their groups Integrated Safety Part 24: Special Requirements and Tests for Transformers and Power Supply Units for Construction Sites;

---Introduction is added in Chapter 2 and Chapter 3;

---The clause number of 7.5 is deleted;

---Adjusted the form of Table 101 and Table 102;

---The article number and title of 16.1 and 16.2 have been adjusted;

---Adjust the notes in 6.2.1 and 16.2.2 to the main text;

--- Delete the clause numbers of 19.1.1, 9.1.2 and 19.1.3, change the content of the paragraph, and adjust the "Note" in 19.1.3 to "Note 4";

---Move Figure 101 and Figure 102 to 16.2.

Introduction

This part is formulated on the basis of GB/T 19212.1-2016, and this part needs to be used in conjunction with GB/T 19212.1-2016.

This part is to supplement and modify the corresponding chapters and articles of GB/T 19212.1-2016 The content is transformed into the content of this section.

This section is numbered starting from 101 for the newly added content of GB/T 19212.1-2016.

1 Scope

This chapter of GB/T 19212.1-2016 is replaced by the following:

This part of GB/T 19212 specifies the safety of transformers for construction sites and power supply devices with built-in transformers for construction sites. band Transformers with electronic circuits are also included in this section.

Note 1. Safety requirements include electrical, temperature and mechanical aspects.

Unless otherwise specified, the following "transformers" include power supply devices for construction site transformers and construction site transformers.

This part is applicable to stationary or mobile, single-phase or multi-phase, air-cooled (self-cooled or air-cooled), supporting or independent use and used in construction On-site isolation or safety isolation dry-type transformers. The winding can be encapsulated or unencapsulated.

The rated power supply voltage does not exceed AC 1000V, and the rated power supply frequency and internal operating frequency do not exceed 500 Hz.

When this part is used in combination with GB/T 19212.17 switching power supply device, it is also applicable to the internal working frequency of more than 500Hz power supply unit.

When the requirements of the two standards are inconsistent, the stricter standard is preferred. The rated output should not exceed:

---25kVA, for single-phase transformer;

---40kVA, for multi-phase transformers.

If the purchaser and the manufacturer agree otherwise, this section also applies to transformers with no restrictions on the rated output.

Note 2. This scope does not include transformers intended to be used in distribution networks.

No-load output voltage and rated output voltage of isolation transformer for construction site and power supply device with isolation transformer for construction site Exceeding AC 50V but not exceeding AC 250V.

No-load output voltage and rating of the safety isolating transformer for construction sites and the power supply device with safety isolating transformer for construction sites The output voltage does not exceed AC 50V.

Note 3. This standard applies to transformers used as power sources in places specified in GB/T 16895.7. GB/T 16895.7 also specifies the use of output winding midpoint or Protective measures for the grounding of the star connection point.

The transformers and power supply devices involved in this section are used in installation procedures or equipment specifications for protection purposes.

When the transformer or power supply device is installed in the low-voltage switchgear and control equipment for construction sites specified in GB/T 7251.4, The additional requirements of GB/T 7251.4 also apply to complete sets of equipment.

Note 4. For transformers filled with liquid media or powder materials (such as sand), additional requirements are under consideration.

Note 5. Pay attention to the following instructions:

--- Protective measures to avoid external influences such as mold, pests, termites, solar radiation and icing should also be considered for the enclosure and the components in the enclosure;

---Different conditions of transportation, storage and work of transformers and power supply units should also be considered;

---For transformers intended to be used in special environments, such as tropical environments, additional attachments that comply with other applicable standards and national regulations can be used. Add requirements.

Note 6. With the future technical development of transformers, it may be necessary to increase the upper limit of the frequency. Until then, this section can be used as a guideline.