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See Chinese contents: GB/T 21707-2018 GB/T 21707-2018: Insulation specification for variable frequency adjustable speed definite purpose converter-fed three-phase induction motors
This standard gives the insulation specifications for variable frequency adjustable speed definite purpose converter-fed three-phase induction motors, including terms and definitions, technical requirements and inspection rules. This standard is applicable to variable frequency adjustable speed definite purpose converter-fed three-phase induction motors with rated voltage of 1140 V and below.
