IEC-61558-2-20-2000 pdf free download – Safety of power transformers, power supply units and similar devices – Part 2-20: Particular requirements for small reactors.
Replacement:
This part of lEC 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 ratedsupply 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 anagreement between the purchaser and the supplier.
This standard is applicable to dry-type small reactors.The windings may be encapsulated ornon-encapsulated.
This standard does not apply to- reactors covered by lEC 60289;
– ballast for tubular fluorescent lamps covered by IEC 60920;
– ballast for discharge lamps (excluding tubular fluorescent lamps) covered by lEC 60922.
NOTE1 For small reactors filled with liquid dielectric or pulverised material such as sand, additional requirementsare under consideration.
NOTE 2 lIn 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 theequipment or requirements by the installation rules or by other appliance specifications.
NOTE4 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 asthe body.
NOTE 6 Small reactors for particular applications will in the future be covered by complementary normativeannexes.
2 Normative references
This clause of part 1 is applicable.
3 Definitions
This clause of part 1 is applicable except as follows:
Modification:
Where part 1 is applicable, the word “transformer”, if used, shall be replaced by “reactor”.
Addition:
3.1.101reactor
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 currentgenerates a magnetic field through a magnetically effective core or through air
NOTE Reactors with toroidal 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 itspolarity 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 itsstrength and the frequency
3.1.104
current compensated reactor
reactor with at least two windings on a common core，where the magnetising currents are inopposite directions in order to reduce the magnetic flux
3.1.105
overload proof reactor
reactor in which the temperature does not exceed the specified limits when the reactor isoverloaded and which continues to meet all requirements of this standard after the removal ofthe overload
3.1.105.1
non-inherently overload proof reactor
overload proof reactor equipped with a protective device which opens the circuit,or reducesthe current in the circuit when the reactor is overloaded,and which continues to meet allrequirements of this standard after the removal of the overload and resetting or replacing of theprotective device
NOTE 1 Examples of protective devices are fuses, overload releases, thermal fuses, thermal links, thermal cut-outs,PTC resistors and automatic circuit-breakers.
NOTE 2 ln case of protection by a device which cannot be replaced nor re-set, the wording “continues to meet allrequirements of this standard after removal of the overload” does not imply that the reactor continues to operate.IEC-61558-2-20 pdf download.