GB/T 21707-2025 Active National standards

GB/T 21707-2025 Insulation specification for frequency conversion machine

Publish Date: 2025-05-30 Implement Date: 2025-12-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

Basic Information

Standard Code: GB/T 21707-2025

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Rotating motor

ICS Name: Rotating motor comprehensive

Publish Date: 2025-05-30

Implement Date: 2025-12-01

Pages: 32 pages

Scope

This document specifies the technical requirements, test methods, test equipment, and inspection rules for the insulation of variable-frequency speed-regulated motors.
This document is applicable to variable-frequency speed-regulated motors with a rated voltage of 1,140 V or lower. High-voltage variable-frequency motors with a rated voltage higher than 1,140 V can be implemented with reference to this document.

Development Information

Word Count: 40 Thousand words Pages: 32 pages

Replace the following standards

GB/T 21707-2018 Insulation specification for variable frequency adjustable speed definite purpose converter-fed three-phase induction motors

Referenced Standards

GB/T 4074.7-2024 Test methods of winding wires—Part 7:Test procedure for the determination of the temperature index of enamelled winding wires GB/T 5591.3-2018 Combined flexible materials for electrical insulation—Part 3:Specifications for individual materials GB/T 6109.1-1990 Enamelled round winding wires—Part 1:General GB/T 6109.1-2008 Enamelled round winding wire—Part 1:General requirements GB/T 7095.1-1995 Enamelled rectangular wires—Part 1—General GB/T 7095.1-2008 Enamelled rectangular copper winding wires—Part 1:General requirements GB/T 11026.4-2012 Electrical insulating materials—Thermal endurance properties—Part 4:Ageing ovens—Single-chamber ovens GB/T 17948.1-2018 Rotating electrical machines—Functional evaluation of insulation systems—Test procedures for wire-wound windings—Thermal evaluation and classification GB/T 17948.3-2017 Rotating electrical machines—Functional evaluation of insulation systems—Test procedures for form-wound windings—Thermal evaluation and classification of insulation systems used in rotating machines GB/T 20629.3-2019 Non-cellulosic papers for electrical purposes—Part 3:Unfilled aramid(aromatic polyamide)papers GB/T 22720.1-2017 Rotating electrical machines—Qualification and quality control tests of partial discharge free electrical insulation systems(TypeⅠ) used in rotating electrical machines fed from voltage converters GB/T 22720.2-2019 Rotating electrical machines—Qualification tests for the partial discharge resistant electrical insulation systems(Type Ⅱ) used in rotating electrical machines fed from voltage converters JB/T 10508-2020 Technical requirements for slot wedges used in small and medium-sized motors GB/T 6109.1-2025 Enamelled round winding wire—Part 1:General requirements

Related Standards

GB/T 7346-1998 Replaced

GB/T 7346-1998 Basic outline constructional type for control motors and feedback components

Publish Date: 1998-01-19

GB/T 4772.1-1999 Replaced

GB/T 4772.1-1999 Dimensions and output series for rotating electrical machines—Part 1:Frame numbers 56 to 400 and flange numbers 55 to 1080

Publish Date: 1999-02-26

GB/T 4772.2-1999 Active

GB/T 4772.2-1999 Dimensions and output series for rotating electrical machines— Part 2:Frame numbers 355 to 1000 and flange numbers 1180 to 2360

Publish Date: 1999-02-26

GB/T 4772.3-1999 Active

GB/T 4772.3-1999 Dimensions and output series for rotating electrical machines— Part 3:Samll built-in motors flange numbers BF10 to BF50

Publish Date: 1999-02-26

GB 10068-2000 Replaced

GB 10068-2000 Mechanical vibration of certain machines with shaft heights 56mm and higher—Measurement,evaluation and limits of vibration

Publish Date: 2000-01-03

GB/T 17948.1-2000 Replaced

GB/T 17948.1-2000 Rotating electrical machines—Functional evaluation of insulation systems—Test procedures for wire-wound windings—Thermal evaluation and classification

Publish Date: 2000-01-03