This chapter of GB 19212.1-2008 is replaced by the following: This part of GB 19212 specifies the safety requirements for general purpose safety isolation transformers and power supply devices equipped with general purpose safety isolation transformers. Transformers with electronic circuits are also included in this section. Note 1: Including electrical, temperature, and mechanical safety. Unless otherwise specified, The following "transformers" include general purpose safety isolation transformers and power supply units equipped with general purpose safety isolation transformers. Note 2: For (linear) power supply units, this part applies. For switching power supply units, IEC 61558-2-16 and this part apply. This part applies to stationary or mobile, single-phase or multiphase, air cooled (self cooled or air cooled) Dry type transformers for independent use and matching use. The winding can be encapsulated or non encapsulated. The rated power supply voltage shall not exceed 1100 V AC, and the rated frequency and internal operating frequency shall not exceed 500 Hz. Rated output not exceeding: -10 kVA for single-phase transformers—— For multiphase transformers, it is 16 kVA. If there is another agreement between the purchaser and the manufacturer, this section also applies to transformers with unlimited rated output. Note 3: This scope does not include transformers intended for use in distribution networks. The no-load output voltage or rated output voltage shall not exceed AC 50 V or ripple free DC 120 V. This section does not apply to external circuits and their components intended to be connected to the input and output terminals of transformers. This section applies to transformers that require double insulation or reinforced insulation between circuits in installation regulations or equipment specifications. Note 4: Please note the following: - For transformers intended for use on vehicles, ships, or aircraft, additional requirements may be required (according to other applicable standards, national regulations, etc.)—— Protective measures to avoid external influences such as mold, pests, termites, solar radiation, and icing on the shell and components inside the shell should also be considered----- The different conditions for transportation, storage, and operation of transformers should also be considered; For transformers intended for use in special environments, such as tropical environments, additional requirements that comply with other applicable standards and national regulations can be adopted. Note 5: With the development of transformer technology in the future, it may be necessary to increase the upper limit of frequency, and until then, this section can be used as a guide
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