IEC 61558-2-19-2000 pdf free download – Safety of power transformers, power supply units and similar devices – Part 2-1 9: Particular requirements for perturbation attenuation transformers
1 Scope
Replacement:
This International Standard deals with all aspects of safety such as electrical,thermal andmechanical.
This part 2-19 of lEC 61558 applies to stationary or portable, single-phase or poly-phase,air-cooled (natural or forced), independent or associated,isolating or safety isolatingtransformers, having a rated supply voltage not exceeding 1 000 v a.c., a rated frequencynot exceeding 500 Hz, a rated output not exceeding 10 kVA. Perturbation attenuationtransformers are intended to the supply of office machines and the like and have a mid-pointlead out in the output circuit in order to attenuate mains borne disturbances.
ln addition, double or reinforced insulation between circuits required by the installation rulesor by the appliance specification is fulfilled by using this transformer.
NOTE 1 Connection of an appliance via transformers of the kind referred to here does not imply that therequirements for this appliance are allowed to be less stringent.
Perturbation attenuation isolating transformers:
have a no-load output voltage and a rated output voltage exceeding 50 V a.c. or 120 vripple-free d.c. and not exceeding 500 v a.c. or 708 v ripple free d.c.; the no-load outputvoltage and the rated output voltage may exceed these limits in order to be inaccordance with the national wiring rules or ‘special purposes，however they shall notexceed 1 0oo v a.c. or 1 415 v ripple free d.c.
Perturbation attenuation 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.
This standard is applicable to dry-type transformers. The windings may be encapsulated ornon-encapsulated.
Where an isolating transformer provides supply to two or more items of equipment,aconnection of exposed-conductive-parts of such equipment is required in accordance withsection 413.5 of lEc 60364-4-41.
NOTE 2 For transformers filled with liquid dielectric or pulverised material, such as sand,additional requirementsare under consideration.
NOTE 3Attention 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 This part 2-19 does not prevent the use of other types of transformers as attenuation transformer withoutmid-point in the output circuit.
This standard does not cover the performances of the function “attenuation”. This function maybe obtained by different features, for example: screen or special lamination.
This standard also applies to transformers incorporating electronic circuits. This standard doesnot apply to external circuits and their components intended to be connected to the input andoutput terminals or socket-outlets of the transformer.
Normative references
This clause of part 1 is applicable.
Definitions
This clause of part 1 is applicable except as follows:
Addition:
3.101
perturbation attenuation transformer
transformer with a mid-point in the secondary winding used for mains-borne perturbationattenuation, which is intended to limit the influence of transients occurring on the mains on theappliances connected to the transformer
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 except as follows:
Addition:
6.101 The rated output voltage shall not exceed:
– 500 v a.c. or 708 V ripple free d.c. for perturbation attenuation isolating transformers;- 50 v a.c. and/or 120 V ripple free d.c. for perturbation attenuation safety isolating
transformers.IEC 61558-2-19 pdf download.