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IEC 61558-2-12

Safety of Power Transformers, Power Supply Units and Similar Devices - Part 2-12: Particular Requirements for Constant Voltage Transformers

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Organization: IEC
Publication Date: 1 June 2001
Status: inactive
Page Count: 46
ICS Code (Transformers. Reactors): 29.180
scope:

This International Standard deals with all aspects of safety such as electrical, thermal and mechanical.

This part of IEC 61558 applies to stationary or portable, single-phase or polyphase, aircooled (natural or forced), associated or independent:

 - constant voltage auto-transformers

 - constant voltage separating transformers

 - constant voltage isolating transformers

 - constant voltage safety isolating transformers

having a rated supply voltage not exceeding 1 000 V a.c., a rated frequency not exceeding 500 Hz, an internal operational frequency not exceeding 30 kHz and no limitation of the rated output.

NOTE 1 The technological development of transformers might imply a need to increase the higher limit of the internal operational frequency; until such time, this standard may be used as a guide.

Constant voltage independent auto-transformers

 - have a no-load output voltage and a rated output voltage exceeding 50 V a.c. or 120 V ripple-free d.c. and not exceeding 1 000 V a.c. or 1 415 V ripple-free d.c.;

 - are used where no insulation between circuits is required by the installation rules or by the equipment specification.

Constant voltage associated auto-transformers

 - have a no-load output voltage and a rated output voltage not exceeding 1 000 V a.c. or 1 415 V ripple-free d.c.

Constant voltage independent separating transformers

 - have a no-load output voltage and a rated output voltage exceeding 50 V a.c. or 120 V ripple-free d.c. and not exceeding 1 000 V a.c. or 1 415 V ripple-free d.c.;

 - are used where double or reinforced insulation between circuits is not required by the installation rules or by the appliance specification.

Constant voltage associated separating transformers

 - have a no-load output voltage and a rated output voltage not exceeding 1 000 V a.c. or 1 415 V ripple-free d.c.

Constant voltage isolating transformers

 - have a no-load output voltage and/or a rated output voltage exceeding 50 V a.c. or 120 V ripple-free d.c. and not exceeding 500 V a.c. or 708 V ripple-free d.c.; the no-load output voltage and the rated output voltage may exceed these limits in order to be in accordance with the national wiring rules or special purposes; however, they shall not exceed 1 000 V a.c. or 1 415 V ripple-free d.c.;

 - are used where double or reinforced insulation between circuits is required by the installation rules or by the appliance specification.

Constant voltage safety isolating transformers

 - have a no-load output voltage and a rated output voltage not exceeding 50 V a.c. or 120 V ripple-free d.c.;

 - are used where double or reinforced insulation between circuits is required by the installation rules or by the appliance specification.

This standard is applicable to dry-type constant voltage transformers. The windings may be encapsulated or non-encapsulated.

NOTE 2  For constant voltage transformers filled with liquid dielectric or pulverized material, such as sand, additional requirements are under consideration.

NOTE 3  Attention is drawn to the fact that

 - for transformers intended to be used in tropical countries, special requirements may be necessary;

 - in locations where special environmental conditions prevail, particular requirements may be necessary.

NOTE 4  For higher no-load output voltages or circuit voltages, additional requirements are necessary but this standard may be used as a guide.

Document History

January 1, 2011
Safety of transformers, reactors, power supply units and combination thereof – Part 2-12: Particular requirements and tests for constant voltage transformers and power supply units for constant voltage
Replacement: This part of IEC 61558 deals with the safety of constant voltage transformers for general applications and power supply units for constant voltage for general applications. Constant...
IEC 61558-2-12
June 1, 2001
Safety of Power Transformers, Power Supply Units and Similar Devices - Part 2-12: Particular Requirements for Constant Voltage Transformers
This International Standard deals with all aspects of safety such as electrical, thermal and mechanical. This part of IEC 61558 applies to stationary or portable, single-phase or polyphase,...

References

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