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

Standard No.

GB 19212.20-2008

Language

Chinese, Available in English version

Release Date

2008

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB 19212.20-2008

Scope

This chapter of GB 19212.1-2003 is replaced by the following content: This part specifies the safety requirements for various aspects of transformers (such as electrical, temperature and mechanical aspects). This section applies to stationary or mobile, single-phase or multi-phase, air-cooled (natural or forced cooling), independent or supporting isolating or safety isolating transformers, whose rated power supply voltage does not exceed AC 1000V, and the rated frequency does not exceed 500Hz, rated output not exceeding 10kVA. Interference attenuating transformers intended for use as power supplies for office equipment or similar equipment have a midpoint output in the output circuit in order to attenuate conducted disturbances from the mains supply. In addition, installation regulations and equipment specifications require that double insulation or reinforced insulation between circuits is also achieved through the use of such transformers. Interference attenuation isolation transformer: its no-load output voltage and rated output voltage exceed AC 50V or ripple-free DC 120V, but do not exceed AC 500V or ripple-free DC 708V; in order to meet the requirements of national wiring regulations or special purposes, the no-load output voltage Or the rated output voltage can exceed these limits, but should not exceed AC 1000V or ripple-free DC 1415V. Interference attenuation safety isolation transformer: its no-load output voltage or rated output voltage does not exceed AC 50V or ripple-free DC 120V. This section applies to dry-type transformers. Its windings can be hermetically sealed or unsealed. If an isolating transformer supplies power to two or more devices, the connection of exposed conductive parts of such devices shall comply with 413.5 of IEC 60364-4-41. This section does not include the performance of the "attenuation" function. This functionality can be achieved by different features such as shielding or special laminations. This standard also applies to transformers incorporating electronic circuits. This standard does not apply to external circuits and their components intended to be connected to the input and output terminals or output sockets of the transformer.

GB 19212.20-2008 Referenced Document

• GB 19212.1-2003 Safety of power transformers,power supply units and similar--Part 1: General requirements and tests

GB 19212.20-2008 history

• 2008 GB 19212.20-2008 Safety of power transformers,power supply units and similar.Part 20:Particular requirements for perturbation attenuation transformers

GB 19212.20-2008 -All Parts