This document specifies the technical requirements, test methods, test equipment and inspection rules for insulation of frequency conversion machine. This document is applicable to frequency conversion machine with rated voltage of 1 140 V and below. It serves as a reference for the implementation of high-voltage variable-frequency motors with a rated voltage higher than 1 140 V.
Basic Data
Standard ID
GB/T 21707-2025 (GB/T21707-2025)
Description (Translated English)
Insulation specification for frequency conversion machine
Sector / Industry
National Standard (Recommended)
Classification of Chinese Standard
K20
Classification of International Standard
29.160.01
Word Count Estimation
30,373
Date of Issue
2025-05-30
Date of Implementation
2025-12-01
Older Standard (superseded by this standard)
GB/T 21707-2018
Issuing agency(ies)
State Administration for Market Regulation, China National Standardization Administration
