IEC 61558-2-4:2009 pdf free download

IEC 61558-2-4:2009 pdf free download Safety of transformers, reactors, power supply units and similar products for supply voltages up to 1 100 V – Part 2-4: Particular requirements and tests for isolating transformers and power supply units incorporating isolating transformers
Replacement:
This part of IEC 61558 deals with the safety of isolating transformers for generalapplications and power supply units incorporating isolating transformers for generalapplications. Transformers incorporating electronic circuits are also covered by thisstandard.
NOTE 1 Safety includes electrical,thermal and mechanical aspects.
Unless otherwise specified，from here onward，the term transformer covers isolatingtransformers for general applications and power supply units incorporating isolatingtransformers for general applications.
NOTE 2 For power supply units (linear) this part is applicable.For switch mode power supply units, IEC 61558-2-16 isapplicable together with this part.
This part is applicable to stationary or portable，single-phase or polyphase, air-cooled(natural or forced) independent or associated dry- type transformers.The windings may beencapsulated or non-encapsulated.
The rated supply voltage does not exceed 1 100 v a.c., and the rated supply frequencyand the internal operating frequencies do not exceed 500 Hz.
The rated output does not exceed:
– 25 kVA for single-phase transformers;- 40 kVA for polyphase transformers.
This part is applicable to transformers without limitation of the rated output subject to anagreement between the purchaser and the manufacturer.
NOTE 3 Transformers intended to supply distribution networks are not included in the scope.
The no-load output voltage or the rated output voltage does exceed 50 V a.c. or 120 vripple-free d.c., and where applicable, does not exceed 500 V a.c. or 708 V ripple-free d.c.
The no-load output voltage and the rated output voltage may be up to 1 000 v a.c.or1415 v ripple-free d.c. for special applications.
This part is not applicable to external circuits and their components intended to be connectedto the input terminals and output terminals of the transformers.
Transformers covered by this part are used in applications where double or reinforcedinsulation between circuits is ‘required by the installation rules or by the end productstandard.
2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
IEC 61 558-1 :2005, Safety of power transformers, power supplies, reactors and similar
products – Part 1: General requirements and tests
3 Terms and definitions
This clause of Part 1 is applicable.
4 General requirements
This clause of Part 1 is applicable.
5 General notes on tests
This clause of Part 1 is applicable.
6 Ratings
This clause of Part 1 is applicable.
Addition:
6.1 01 The rated output voltage shall exceed 50 V a.c. or 1 20 V ripple-free d.c. but not
exceed;
– 250 V a.c. for single-phase portable transformers;
– 400 V a.c. for polyphase portable transformers, and