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GB/T 21205-2022Rotating electrical machines - Repair, overhaul and reclamation (English PDF)

旋转电机修理、检修和修复

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

October 12, 2022

Implementation date

May 1, 2023

Scope

GB/T 21205-2022 is the English-translated version of 旋转电机修理、检修和修复.

GB/T 21205-2022 is the Chinese standard "Rotating electrical machines - Repair, overhaul and reclamation". Its scope clause reads: This document specifies the necessary procedures for the repair, overhaul and restoration of all types and sizes of rotating electrical machines covered by the IEC 60034 series.

This document establishes a common industry practice covering all aspects of complete repair of electric motors.

Operating range depends on motor type, rated value, environmental conditions, and reliability and safety of the device. include. --- If necessary, determine the cause of the failure; --- Determine the scope of repair as appropriately as possible; --- If required, define the modified performance, operating requirements and environmental conditions; ---If required, review the original design and update the design specifications; ---Inspect the quality and performance of the repaired motor, maintain or improve the rated energy efficiency; ---Ensure that environmental factors are taken into account.

This document does not supersede the requirements specified in IEC 60079-19, or other requirements concerning the repair or overhaul of motors used in explosive atmospheres Require.

Motors for special occasions such as airtight type, submersible type, nuclear energy application type, hydrogen-cooled motor, military type, aviation motor and traction motor The technical requirements shall be negotiated between the service unit and the user.

This document does not replace the original motor manufacturer's instructions and recommendations. Redesigns and performance changes that would require motor designer involvement are beyond the scope of this document.

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Document preview — GB/T 21205-2022

National Standard of the People's Republic of China

ICS: 29.160.01
Classification: K 20
Replacing: GB/T 21205-2007

Issued by: State Administration for Market Regulation, China National Standardization Administration

Preface
1 Scope
2 Normative references
3 Terms and Definitions
4 Basic principles
4.1 References
4.2 Hazardous areas
4.3 Special applications
4.4 Efficiency
4.5 System Efficiency
4.6 Environment and end-of-life recycling
4.7 Circular economy
5 General requirements for repairs
5.1 Overview
5.2 Maintenance unit
5.3 Scope of work
5.4 Standard
5.5 Quality plan
5.6 User provided information
5.7 Required documents
6 The complete machine. inspection, testing and evaluation
6.1 External inspection
6.2 Test before disassembly
6.3 Stator winding or rotor winding test
6.4 Shafts and bearings
6.5 Rotor cage winding integrity
7 Disassembled motor. inspection, testing and evaluation
7.1 General
7.2 Cleaning
7.3 External inspection
7.4 Air gap
7.5 Ventilation
7.6 Stator
7.7 Rotor
7.8 Slip ring
7.9 Brushes and brush holders
7.10 Rolling bearings
7.11 Sliding bearings
7.12 Seals and labyrinth seals
8 Repair work
8.1 Winding inspection
8.2 Core inspection
8.3 Rewinding
8.4 Part
8.5 Rotor
8.6 Axis
8.7 Bearings
8.8 Lubrication
8.9 Space heaters
8.10 Temperature sensor
8.11 Protection against water, dust and corrosion
8.12 Junction boxes and terminals
9 Final Test
9.1 Test equipment
9.2 Insulation resistance
9.3 Winding resistance
9.4 No-load test
9.5 Marking of magnetic center (according to negotiation)
9.6 Blockage test (if applicable)
9.7 Motor full-load running test
9.8 Heating test with full current at zero power factor (according to negotiation)
9.9 Electromagnetic compatibility (according to agreement)
9.10 Auxiliary equipment
9.11 Salient pole DC or AC voltage drop test
10 Additional requirements for DC motors
10.1 Overview
10.2 The complete machine. inspection, testing and evaluation
10.3 Disassembled motor. inspection, testing and evaluation
10.4 Repair work
10.5 DC Motor Final Test
11 Additional requirements for high-voltage AC motors (according to negotiation)
11.1 Inspection and testing of the complete machine
11.2 Disassembled high voltage motor, inspection and test
11.3 High voltage motors. final test
12 Additional tests for high voltage generators
12.1 Stator winding crack corrosion
12.2 Solid Cylindrical Rotor
12.3 Cooling circuit (hydrogen/water)
13 Client reporting and handover
13.1 Exterior finishes
13.2 Shipping and packaging
13.3 Reports to users
Appendix A (Informative) Repair, Overhaul, Restoration Flowchart
Appendix B (Informative) Standard Extract and Tolerance Table

1 Scope

This document specifies the necessary procedures for the repair, overhaul and restoration of all types and sizes of rotating electrical machines covered by the IEC 60034 series.

This document establishes a common industry practice covering all aspects of complete repair of electric motors. Operating range depends on motor type, rated value, environmental conditions, and reliability and safety of the device. include.

--- If necessary, determine the cause of the failure;

--- Determine the scope of repair as appropriately as possible;

--- If required, define the modified performance, operating requirements and environmental conditions;

---If required, review the original design and update the design specifications;

---Inspect the quality and performance of the repaired motor, maintain or improve the rated energy efficiency;

---Ensure that environmental factors are taken into account.

This document does not supersede the requirements specified in IEC 60079-19, or other requirements concerning the repair or overhaul of motors used in explosive atmospheres

Require.

Motors for special occasions such as airtight type, submersible type, nuclear energy application type, hydrogen-cooled motor, military type, aviation motor and traction motor

The technical requirements shall be negotiated between the service unit and the user.

This document does not replace the original motor manufacturer's instructions and recommendations.

Redesigns and performance changes that would require motor designer involvement are beyond the scope of this document.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references

For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 2900.25-2008 Electrotechnical terminology for rotating electrical machines (IEC 60050-411.1996, IDT)

ISO 21940-11 Mechanical vibration rotor balancing - Part 11.Procedures and tolerances for rigid rotors (Mechanical and performance)

Note. GB/T 755-2019 Rating and performance of rotating electrical machines (IEC 60034-1.2017, IDT)

Note. GB/T 1993-1993 cooling method for rotating electrical machines (IEC 60034-6.1991, eqv) protection)

Note. GB/T 13002-2022 Thermal protection of rotating electrical machines (IEC 60034-11.2020, IDT)

Note. GB/T 32891.1-2016 Efficiency Classification of Rotating Electrical Machines (IE Code) Part 1.Mains-Powered AC Motors (IEC 60034-30-1.

2014, IDT)

GB/T 21707 | GB/T 20834 | GB/T 20833.1 | GB/T 21209 | GB/T 21209 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 81 pages — is available in the English PDF.

Referenced standards

Normative references

IEC 60050 · ISO 21940 · IEC 60034

Cited by

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