BS EN 61558-2-10:2014

Safety of transformers, reactors, power supply units and combinations thereof. Particular requirements and tests for separating transformers with high insulation level and separating transformers with output voltages exceeding 1 000 V | Status: Superseded, Withdrawn

1 Scope Replacement: This part of IEC 61558 deals with the safety of separating transformers with high insulation level and separating transformers with output voltages exceeding 1 000 V. Transformers incorporating electronic circuits are also covered by this standard.

NOTE 1 Safety includes electrical, thermal and mechanical aspects.

Unless otherwise specified, from here onward, the term transformer covers separating transformers with high insulation level and separating transformers with output voltages exceeding 1 000 V a.c or 1 500 V d.c . This Part 2-10 is applicable to stationary or portable, single-phase or polyphase, air-cooled (natural or forced) independent or associated dry-type transformers. The windings may be encapsulated or non-encapsulated. This standard is applicable to transformers and power supply (linear) with internal operational frequencies not exceeding 500 Hz. This standard used in combination with Part 2-16 for switch mode power supply units (SMPS) is also applicable to power supplies with internal operational frequencies higher than 500 Hz. Where the two requirements are in conflict the most severe take precedence. The rated supply voltage does not exceed 1 000 V a.c., and the rated supply frequency and the internal operating frequency do not exceed 500 Hz. The rated output does not exceed:

• — 25 kVA for single-phase transformers;
• — 40 kVA for polyphase transformers.

This Part 2-10 is applicable to transformers without limitation of the rated output subject to an agreement between the purchaser and the manufacturer. Where applicable the no-load output voltage or the rated output voltage:

• — does not exceed 1 000 V a.c. or 1 500 V d.c. for separating transformers with high insulation level;
• — does exceed 1 000 V a. c or 1 500 V d.c. and does not exceed 15 000 V a.c. or 15 000 V d.c. for separating transformer with output voltage exceed 1 000 V.

This Part 2-10 is not applicable to:

• — transformers covered by IEC 60076‑11;
• — neon transformers covered by IEC 61050 and
• — power supplies and converters for use with or in products according to IEC 61347‑2‑10.

This Part 2-10 is not applicable to external circuits and their components intended to be connected to the input terminals and output terminals of the transformers. Transformers covered by this Part 2-10 are used only in applications where double or reinforced insulation between circuits is not required by the installation rules or by the end product standard.

NOTE 2 Normally, the transformers are intended to be used with equipment to provide voltages different from the supply voltage for the functional requirements of the equipment. The protection against electric shock can be provided (or completed) by other features of the equipment, such as the body. Parts of output circuits can be connected to the input circuits or to protective earth.

This Part 2-10 is applicable to transformers associated with specific equipment, to the extent decided upon by the relevant IEC technical committees.

NOTE 3 Attention is drawn to the following:

• — for transformers intended to be used in vehicles, on board ships, and aircraft, additional requirements (from other applicable standards, national rules, etc.) can 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 can also be considered;
• — the different conditions for transportation, storage, and operation of the can also be considered;
• — additional requirements in accordance with other appropriate standards and national rules can be applicable to transformers intended for use in special environments, such as tropical environment.

NOTE 4 Future technological development of transformers can necessitate a need to increase the upper limit of the frequencies, until then this Part 2-10 can be used as a guidance document.