This chapter of GB/T 19212.1-2016 is replaced by the following: This part of GB/T 19212 specifies the safety of general purpose constant voltage transformers and general purpose constant voltage power supply devices. Constant voltage transformers with electronic circuits are also included in this section. Note 1:; Safety requirements include electrical, temperature, and mechanical aspects. Unless otherwise specified, The following "transformers" include general-purpose constant voltage transformers and general-purpose constant voltage power supply devices. This section applies to stationary or mobile, single-phase or multiphase, air cooled (self cooled or air cooled) Dry type transformers for independent or supporting use: constant voltage self winding transformers; Constant voltage separation transformer-- Constant voltage isolation transformer: Constant voltage safety isolation transformer. The winding can be encapsulated or non encapsulated. This section is applicable to transformers and power supply devices with internal operating frequencies not exceeding 500Hz (linear). When used in conjunction with GB/T19212.17 switch mode power supply devices, this section is also applicable to power supply devices with internal operating frequencies exceeding 500Hz. When there is a conflict between the requirements of two standards, the most stringent standard shall be used first. The rated power supply voltage shall not exceed 1000 V AC, the rated power supply frequency shall not exceed 500 Hz, the internal working resonance frequency shall not exceed 30 kHz, and the internal working frequency shall not exceed 100 MHz. Rated output not exceeding: -40 kVA, for single-phase constant voltage autotransformers: -200kVA, for multiphase constant voltage autotransformers- 25kVA. For single-phase constant voltage separation transformers and constant voltage isolation transformers-- 40kVA, for multiphase constant voltage separation transformers and constant voltage isolation transformers- 10kVA. Safe isolation transformer for single-phase constant voltage- 16kVA, for multiphase constant voltage safety isolation transformer. If agreed upon between the purchaser and the manufacturer, this section also applies to transformers without rated output limits. Note 2: This scope does not include transformers intended for use in the distribution network. The following applies to constant voltage autotransformers: - The no-load output voltage or rated output voltage does not exceed AC 1000V or ripple free DC 1415V. For independent constant voltage autotransformers, the no-load output voltage and rated output voltage exceed AC 50V or ripple free DC 120V- The constant voltage autotransformers included in this section are only applicable in situations where installation regulations or final product standards do not require insulation between circuits. The following applies to constant voltage separation transformers: - The no-load output voltage or rated output voltage does not exceed AC 1000V or ripple free DC 1415V, and for independent constant voltage separation transformers, the no-load output voltage and rated output voltage exceed AC 50V or ripple free DC 120V
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