IEC 61558-2-20:2000 pdf download-Safety of power transformers, power supply units and similar devices – Part 2-20: Particular requirements for small reactors.
1 Scope Replacement: This part of IEC 61558 applies to stationary or portable, single-phase or poly-phase, air-cooled (natural or forced) general purpose small reactors, including alternating current, premagnetised and current compensated reactors, independent or associated, having a rated supply voltage not exceeding 1 000 V a.c. or d.c. and rated frequency not exceeding 1 MHz, the rated power not exceeding – 2 kVAR a.c. (2 kW d.c.) for single-phase reactors; – 10 kVAR a.c. (10 kW d.c.) for poly-phase reactors. This standard is also applicable to small reactors without limitation of the rated power; however, such small reactors are considered as special reactors and are subjected to an agreement between the purchaser and the supplier. This standard is applicable to dry-type small reactors. The windings may be encapsulated or non-encapsulated. This standard does not apply to – reactors covered by IEC 60289; – ballast for tubular fluorescent lamps covered by IEC 60920; – ballast for discharge lamps (excluding tubular fluorescent lamps) covered by IEC 60922. NOTE 1 For small reactors filled with liquid dielectric or pulverised material such as sand, additional requirements are under consideration. NOTE 2 In locations where special environmental conditions prevail, particular requirements may be necessary. NOTE 3 Normally, small reactors are intended to be associated with equipment for functional requirements of the equipment or requirements by the installation rules or by other appliance specifications. NOTE 4 Small reactors incorporating electronic circuits and components are also covered by this standard. NOTE 5 The safety insulation may be provided (or completed) by other parts or features of the equipment, such as the body. NOTE 6 Small reactors for particular applications will in the future be covered by complementary normative annexes.
3.1.101 reactor arrangement comprising one or more windings with an impedance depending on the frequency, working in accordance with the principle of self-induction whereby a magnetising current generates a magnetic field through a magnetically effective core or through air NOTE Reactors with toroïdal core are also included in this definition. 3.1.102 alternating current reactor reactor in which the magnetising current generates an alternating magnetic field, changing its polarity depending on the frequency 3.1.103 premagnetised reactor reactor in which the magnetising direct current generates a magnetic field of only one polarity, while a superimposed alternating current alters the direct magnetic field depending on its strength and the frequency 3.1.104 current compensated reactor reactor with at least two windings on a common core, where the magnetising currents are in opposite directions in order to reduce the magnetic flux