GB/T 19212.5-2025Safety of transformers, reactors, power supply units and combinations thereof - Part 5: Particular requirements and tests for isolating transformers and power supply units incorporating isolating transformers for general applications (English PDF)

Foreword

This document was drafted in accordance with the provisions of GB/T 1.1-2020

Directives for standardization - Part 1.Rules for the structure and drafting of

standardizing documents.

This document is Part 5 of GB/T 19212 Safety of transformers, reactors, power supply

units and combinations thereof 1). GB/T 19212 has been published in the following parts.

-- Part 1.General requirements and tests;

-- Part 2.Particular requirements and tests for separating transformers and power

supply units incorporating separating transformers for general applications;

-- Part 3.Particular requirements and tests for control transformers and power

supplies incorporating control transformers;

-- Part 4.Particular requirements and tests for ignition transformers for gas and oil

burners;

-- Part 5.Particular requirements and tests for isolating transformers and power

supply units incorporating isolating transformers for general applications;

-- Part 6.Particular requirements and test for transformer for shavers, power supply

units for shavers and shaver supply units;

-- Part 7.Particular requirements and test for safety isolating transformers and

power supply units incorporating safety isolating transformers;

-- Part 8.Particular requirements and tests for transformers and power supplies for

toys;

-- Part 9.Particular requirements and tests for transformers and power supply units

for bells and chimes;

-- Part 10.Particular requirements and tests for transformers and power supply

units for class III handlamps for tungsten filament lamps;

1) In this series of documents, some parts are under the title of "Safety of power transformers, power supplies,

reactors and similar products", some parts are under the title of "Safety of transformers, reactors, power supply

units and similar products for supply voltages up to 1100 V", and some parts are under the title of "Safety of

transformers, reactors, power supply units and combinations thereof". All future releases of this series of

documents will be published under the title of "Safety of transformers, reactors, power supply units and

combinations thereof".

-- Part 11.Particular requirements and tests for separating transformers with high

insulation level and separating transformers with output voltages exceeding

1000 V;

-- Part 13.Particular requirements and tests for constant voltage transformers and

power supply units for constant voltage;

-- Part 14.Particular requirements and tests for auto-transformers and power supply

units incorporating auto-transformers for general applications;

-- Part 15.Particular requirements and tests for variable transformers and power

supply units incorporating variable transformers;

-- Part 16.Particular requirements and tests for isolating transformers for the supply

of medical locations;

-- Part 17.Particular requirements and tests for switch mode power supply units

and transformers for switch mode power supply units;

-- Part 20.Particular requirements for perturbation attenuation transformers;

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

-- Part 24.Particular requirements and test for transformers and power supply units

for construction sites;

-- Part 27.Particular requirements and tests for transformers and power supply

units all for saving energy and other purposes.

This document replaces GB/T 19212.5-2011 Safety of transformers, reactors, power

supply units and similar products for supply voltages up to 1100V - Part 5.Particular

requirements and tests for isolating transformers and power supply units incorporating

isolating transformers. Compared with GB/T 19212.5-2011, in addition to structural

adjustments and editorial changes, the main technical changes are as follows.

-- The scope has been changed and the rated power supply voltage of the applicable

scope has been changed from "1100 V" to "1000 V" (see Chapter 1; see Chapter

1 of the 2011 edition);

-- The rated power supply voltage has been changed (see 6.104; see 6.104 of the

2011 edition);

-- The graphic symbols have been changed, and a new symbol for the output

voltage of "linear power supply unit" has been added (see Chapter 8; see Chapter

8 of the 2011 edition);

Safety of transformers, reactors, power supply units and

combinations thereof - Part 5.Particular requirements and

tests for isolating transformers and power supply units

incorporating isolating transformers for general applications

1 Scope

This chapter of GB/T 19212.1-2023 is replaced by the following content.

This document specifies the electrical, temperature and mechanical safety requirements

and test requirements for isolating transformers and power supply units incorporating

isolating transformers for general applications. Transformers with electronic circuits are

also included in this document.

Unless otherwise specified, the term "transformer" below includes isolating

transformers and power supply units incorporating isolating transformers for general

applications.

For (linear) power supply units, this document applies. For switch mode power supply

units, GB/T 19212.17 applies.

This document applies to stationary or mobile, single-phase or multi-phase, air-cooled

(natural or air-cooled), independent or associated dry-type transformers. The windings

can be encapsulated or non-encapsulated.

The rated power supply voltage shall not exceed AC 1000 V, and the rated power supply

frequency and internal operating frequency shall not exceed 500 Hz.

Rated output does not exceed.

-- 25 kVA for single-phase transformers;

-- 40 kVA for multiphase transformers.

If the purchaser and the manufacturer agree otherwise, this document also applies to

transformers with no restrictions on rated output.

NOTE 1.Transformers intended to supply power to distribution networks are not included in this scope.

The no-load output voltage or rated output voltage exceeds 50 V AC or 120 V ripple-

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