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GB/T 20833.3-2018Rotating electrical machines -- Stator winding insulation of rotating electrical machines -- Part 3: Dielectric dissipation factor measurement (English PDF)

旋转电机旋转电机定子绕组绝缘第3部分：介质损耗因数测量

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

July 13, 2018

Implementation date

February 1, 2019

Scope

GB/T 20833.3-2018 is the English-translated version of 旋转电机旋转电机定子绕组绝缘第3部分：介质损耗因数测量.

GB/T 20833.3-2018 is the Chinese standard "Rotating electrical machines -- Stator winding insulation of rotating electrical machines -- Part 3: Dielectric dissipation factor measurement".

Its scope clause reads: This part of GB/T 20833 specifies the test procedure and test results of the measurement of the dielectric loss factor of the stator winding of a rotating electrical machine.

The guide is applicable to rotating electric machines with rated voltages of 6kV and above and with end anti-halation layer. This section applies to single molded winding stator bars and coils that are installed/not installed in the core, new or aged motors Completely formed stator windings.

This section applies to all types of vacuum impregnated or multi-rubber rods, coils and complete windings, not for unimpregnated single bars and Coil or complete winding.

This part gives the introduction of single-form stator bars and coils for motors with rated voltages of 6kV and above under power frequency AC voltage. Necessary conditions for mass loss factor measurement. Its clauses include terms and definitions.

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Document preview — GB/T 20833.3-2018

National Standard of the People's Republic of China

ICS: 29.160.01
Classification: K 20

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

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and Definitions
4 Principles and Measurement Techniques
5 Test procedure
6 test results
7 Test report
Appendix A (informative) Relationship between power factor and loss factor

1 Scope

This part of GB/T 20833 specifies the test procedure and test results of the measurement of the dielectric loss factor of the stator winding of a rotating electrical machine.

The guide is applicable to rotating electric machines with rated voltages of 6kV and above and with end anti-halation layer.

This section applies to single molded winding stator bars and coils that are installed/not installed in the core, new or aged motors

Completely formed stator windings.

This section applies to all types of vacuum impregnated or multi-rubber rods, coils and complete windings, not for unimpregnated single bars and

Coil or complete winding.

This part gives the introduction of single-form stator bars and coils for motors with rated voltages of 6kV and above under power frequency AC voltage.

Necessary conditions for mass loss factor measurement.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.

Pieces. For undated references, the latest edition (including all amendments) applies to this document.

IEC 60060-1 High Voltage Test Technique Part 1. General Definitions and Test Requirements (High-voltagetesttechniques-

Part 1. Generaldefinitionsandtestrequirements)

IEC 60060-2 High Voltage Test Technique Part 2. Measurement Systems (High-voltagetesttechniques-Part 2.

Measuringsystems)

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 Rated voltage

UN For motors with specified operating conditions, the voltage or voltage range between the ends of the motor (also known as the line-to-line voltage) is usually determined by the manufacturer.

Provisions.

3.2 Dielectric loss factor

Tandelta

The tangent of the dielectric loss angle delta (the angle of the insulation power factor angle) at a predetermined temperature, frequency, voltage, or dielectric stress.

Note 1. Sometimes other terms can be used to indicate this property, such as tan delta, loss angle, dielectric loss factor or dielectric power factor. Dielectric loss factor and power factor

There is a difference in physicality between the number (the sine of the dielectric loss angle or the cosine of the power factor angle), but when the dielectric loss factor is less than 100×10-3

The two measurements are almost equal (see 4.1).

Note 2. The dielectric loss factor tan delta in this part is expressed in absolute value, and can also be expressed as a percentage in other documents.

GB/T 20834 | GB/T 20833.1 | GB/T 20140 | GB/T 20833.2 | GB/Z 20833.5 | GB/T 20833.4 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 35 pages — is available in the English PDF.

Referenced standards

Normative references

IEC 60060

Cited by

GB/T 20833.2-2025Rotating electrical machines - Winding insulation - Part 2: On-line partial discharge measurements on the stator winding insulation

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