Safety of transformers, reactors, power supply units and combinations thereof - Particular requirements and tests for small reactors

Safety of transformers, reactors, power supply units and combinations thereof - Particular requirements and tests for small reactors

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1   Scope

Replacement:
This part of IEC 61558 deals with the safety of small reactors for general applications.

NOTE 1 Safety includes electrical, thermal and mechanical aspects.

Unless otherwise specified, from here onward, the term transformer or reactor covers small reactors.
This part is applicable to stationary or portable, single-phase or polyphase, air-cooled (natural or forced) general purpose reactors including alternating current, premagnetised and current compensated independent or associated reactors.
The rated supply voltage does not exceed 1 000 V a.c. or 1 500V ripple-free d.c., the rated supply frequency and the internal operational frequencies do not exceed 1 MHz.
The rated power does not exceed:
  • — 25 kVAR a.c. (25 kW d.c.) for single-phase reactors,
  • — 50 kVAR a.c. (50 kW d.c.) for poly-phase reactors.
This part is applicable to reactors without limitations of the rated power subject to an agreement between the purchaser and the manufacturer.
This part is applicable to dry-type reactors. The windings may be encapsulated or non-encapsulated.
This part does not apply to:
  • — reactors covered by IEC 60289;
  • — ballast for tubular fluorescent covered by IEC 61347‑2‑8;
  • — ballast for discharge lamps (excluding tubular fluorescent lamps) covered by IEC 61347‑2‑9.

NOTE 2 For reactors filled with liquid dielectric or pulverised material such as sand, additional requirements are under consideration.

NOTE 3 Attention is drawn to the following:

  • — for reactors intended to be used in vehicles, on board ships, and aircraft, additional requirements (from other applicable standards, national rules, etc.) may be necessary;
  • — measures to protect the enclosure and the components inside the enclosure against external influences such as fungus, vermin, termites, solar-radiation, and icing should also be considered;
  • — the different conditions for transportation, storage, and operation of the reactor should also be considered;
  • — additional requirements in accordance with other appropriate standards and national rules may be applicable to reactors intended for use in special environments, such as tropical environment.

NOTE 4 Normally, 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 5 Reactors incorporating electronic circuits and components are also covered by this standard.

NOTE 6 The protection against electric shock may be provided (or completed) by other parts or features of the equipment, such as the body.

NOTE 7 Reactors for particular applications will in the future be covered by complementary normative annexes.

NOTE 8 Future technological development of reactors may necessitate a need to increase the upper limit of the frequencies, until then this part may be used as a guidance document.