This chapter of the scope GB 19212.1-2008 is replaced by the following: This part of GB 19212 specifies safety regulations for control transformers and power supplies with built-in control transformers, such as safety regulations for electrical, temperature, and mechanical aspects. This section applies to power supplies for control transformers, built-in control transformers, and electronic circuits
This section does not apply to external circuits and their components intended to be connected to the input and output terminals or output sockets of transformers and power supplies This section does not apply to transformers included in IEC 60076-11. This section is applicable to stationary or mobile, single-phase or multiphase, air cooled (self cooled or air cooled), independent or matched control transformers, and power supplies with built-in control transformers. The rated power supply voltage does not exceed 1000 V AC, and the rated power supply frequency and internal operating frequency do not exceed 500 Hz. The rated thermal output shall not exceed: -25 kVA for single-phase control transformers and single-phase power supplies with built-in control transformers—— The multiphase power supply for multiphase control transformers and built-in control transformers is 40 kVA. If there is another agreement between the purchaser and the manufacturer, this section also applies to the power supply of control transformers and built-in control transformers that do not limit the rated output. This section is applicable to dry-type transformers, whose windings can be encapsulated or non encapsulated. The no-load output voltage or rated output voltage shall not exceed 1000 V AC or 1415 V ripple free DC. For independent control transformers and independent power supplies with built-in control transformers, their no-load output voltage and/or rated output voltage shall not be less than AC 50 V or ripple free DC 120 V. The control transformers included in this section are only used in situations where double insulation or reinforced insulation is not required between circuits according to installation regulations or terminal product standards. Note 1: Usually, the power supply of control transformers and built-in control transformers is intended to provide a voltage that differs from the power supply voltage due to functional needs to the equipment used with them. Electric shock protection is provided or improved by other components of the equipment, such as the casing. Some output circuits can be connected to input circuits or ground protection circuits. This section applies to the power supply of control transformers and built-in control transformers that are matched with specific equipment (whose scope is determined by the relevant technical committee)
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