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          Comparison of the highest voltage for equipment Um specified in GB and IEC standards
          DATE : 2020-04-24 READ : 1220

          For instrument transformer, there are various standards in different countries and areas. Mainly including GB 20840 (China), IEC 61869 (Europe) and ANSI 57.13 (USA). The standard value of the highest voltage for equipment regulated by different standards is different, resulting in possible differences when selecting transformers. While most standards say that, for equipment to be installed under normal environmental conditions relevant to insulation Um shall be at least equal to Usys. Further comparison of Um value as followings:

          It can be found that the IEC standard corresponding to the Um = 36kV transformer, in the national standard GB does not have the corresponding value Um, should choose Um = 40.5 for installation. Meanwhile, we can observe that, in this case IEC requires testing with a rated lightning impulse withstand voltage (peak) of 170kV, and the test value required by the Chinese national standard GB is usually 200kV. Therefore, we say that the testing requirements of the national standard are more strictly than those of other standards.


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