Electromagnetic compatibility of technical equipment. Short range devices operating on frequencies between 3 kHz and 400 GHz. Requirements and test methods
United power system and isolated power systems. Relay protection and automation. Automatic emergency control of electric power systems. Automatic frequency unloading devices. Norms and requirements
Safety of transformers, reactors, power supply units and combinations thereof. Part 2-26. Particular requirements and tests for transformers and power supply units all for saving energy and other purposes
