GB/T 19212.3-2012 Safety of power transformers, power supplies, reactors and similar products - Part 3: Particular requirements and tests for control transformers and power supplies incorporating control transformers
2019GB/T 19212.13-2019 Safety of transformers,reactors,power supply units and combination thereof—Part 13: Particular requirements and tests for constant voltage transformers and power supply units for constant voltage
2005GB/T 19212.13-2005 Safety of power transformers, power supply units and similar devices -- Part 13: Particular requirements for constant voltage transformers