GB/T 19212.20-2008Safety of power transformers, power supply units and similar -- Part 20: Particular requirements for perturbation attenuation transformers (English PDF)

GB/T 19212.20-2008 (Safety of power transformers, power supply units and similar -- Part 20: Particular requirements for perturbation attenuation transformers) is available as an English-translated PDF.

GB/T 19212.20-2008 — The chapter GB 19212.1-2003 by the following instead. This section provides various aspects of the transformer (eg, electrical, thermal and mechanical aspects) safety requirements.

This section applies to Stationary or mobile, single-phase or multi-phase, air-cooled (natural cooling or forced cooling), alone or supporting the use of isolation or safety isolating transformer, its rated supply voltage not exceeding AC 1000V, rated frequency not exceeding 500Hz, rated output not exceeding 10kVA.

Disturbance attenuation transformer intended to be used as office equipment or similar equipment power supply, the output circuit having a midpoint output to it attenuate conducted interference MAINS.

In addition, the installation procedures and equipment specifications double insulation or reinforced insulation between circuits should be implemented through the use of such a transformer.

Note 1. The use of such a transformer connected to the device specified in this does not mean that you can reduce the requirements for the device.

Disturbance attenuation isolating transformer. --- No-load output voltage and rated output voltage exceeding 50V AC or ripple-free DC 120V, but not more than AC 500V or Ripple-free DC 708V; To comply with national wiring regulations or requirements for a particular purpose, no-load output voltage or the rated output voltage these limits may be exceeded, but not exceed 1000V AC or ripple-free DC 1415V.

Disturbance attenuation safety isolating transformer. --- No-load output voltage or the rated output voltage does not exceed 50V AC or ripple-free DC 120V. This section applies to dry-type transformers.

Windings can be sealed or non-sealed. If the isolation transformer to two or more devices to provide power, so some of the devices connected to the exposed conductive parts Need to comply with the provisions of 413.5 of IEC 60364-4-41.

Note 2. The media is filled with a liquid or powder material (such as sand) of the transformer, the additional requirements are under consideration.

Note 3. to note the following. --- For transformer intended to use in a tropical climate countries, special requirements may be necessary; --- Located in areas of special environmental conditions may require specific requirements.

Note 4. This section does not prevent the use of the output circuit midpoint no other types of transformers as attenuation transformers. This section does not include the performance of "decay" feature.

This function can be different characteristics, e.g., to block or special laminate obtain. This section also applies to transformers incorporating electronic circuits.

This part is not intended to be used with the transformer input and output terminals or output A receptacle connector and an external circuit components.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 8 pages — is available in the English PDF.

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