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GB 1094.1-1996 Power transformers - Part 1 General GB 1094.2-1996 Power transformers - Part 2 GB 1094.3-2003 temperature Power transformers - Part 3: Insulation levels, dielectric tests and external insulation air gap GB 1094.5-2008 Power transformers - Part 5 : GB 20052-2006 ability to withstand short circuit three-phase distribution transformers energy efficiency of limited value and energy conservation evaluation values GBT 1094.10-2003 power transformers - Part 10: Determination of sound levels GBT 1094.101-2008 power transformers - Part 10.1 Determination of sound levels - Application guide GBT 1094.4-2005 power transformers - Part 4: Power transformers and reactors lightning impulse and switching impulse testing guidelines GBT21419-2008_ power transformers, power supply units, reactors and similar products _ electromagnetic compatibility (EMC) requirements.

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