GB/T 34665-2017 in English

VALID

Measurement method of dielectric dissipation factor of electric machinery coil/winding insulation

Issued on:2017-11-01
Implemented on:2018-05-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $250.00
$243.00

Standard No:	GB/T 34665-2017
Document status:	VALID
Title in English:	Measurement method of dielectric dissipation factor of electric machinery coil/winding insulation
Title in Chinese:	电机线圈/绕组绝缘介质损耗因数测量方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2017-11-01
Implemented on:	2018-05-01
ICS Classification:	29.080.30-Insulation systems
Professional Classification:	GB-National Standard
Related Keywords:	dielectric dissipation factor motor insulation measurement measurement method dielectric loss factor complete winding measurement single coil measurement characteristics
Related Topics:	Dielectric loss type Dielectric constant insulation loss Dielectric Loss Coefficient Dielectric Loss Coefficient Liquid dielectric loss Coil About Dielectric Loss Dielectric Tangent Loss Dielectric loss substrate Coil temperature measurement Conductor dielectric loss Copper dielectric loss Dielectric Loss Definition The dielectric loss of the motor Dielectric losses in motors Wire coil insulation measurement Cable Dielectric Loss Dielectric loss Dielectric Loss for Dielectric Tests dielectric loss Dielectric loss factor Dielectric Loss Detection Dielectric loss factor Loss Factor Test Method Loss Factor Test Method GB/T 34665-2017 Dielectric and Insulation Dielectric Loss Detection GB/T34665-2017 Motor dielectric loss Dielectric Loss Test Method Medium measurement Solid electrical insulating materials - measurement of dielectric constant and dielectric loss factor Loss and loss modulus gbt 34665-2017 motor coil factor factor Loss factor measurement winding coil GBT34665 GB/T 34665-2017 Recommended Methods for Permittivity and Dielectric Dissipation Factor GBT34665 Charging loss Welding machine insulation test The difference between dielectric loss and dielectric loss Motor losses and measurement conditions Capacitor insulation medium inspection Dielectric Loss Enforcement Cable dielectric loss standard value Component insulation parameters How to measure media Plastic dielectric loss Welding machine insulation testing method Motor coil material Low loss media measurement Transformer winding insulation resistance test method Motor dielectric loss test standard

《GB/T 34665-2017电机线圈/绕组绝缘介质损耗因数测量方法》由TC301（全国电气绝缘材料与绝缘系统评定标准化技术委员会）归口，主管部门为中国电器工业协会。

Introduction

Standard Development Background and Technology Evolution

GB/T 34665—2017 is a national standard for the measurement method of the dielectric loss factor of motor coils/windings, which aims to standardize the measurement process of rotating motors of different voltage levels. This standard was proposed by the China Electrical Equipment Industry Association and is managed by the National Technical Committee for the Evaluation of Electrical Insulation Materials and Insulation Systems. The background of its formulation mainly stems from the need to evaluate the insulation performance of motors, especially to ensure the safe operation of equipment under high voltage environments.

Core Terminology Explanation

Capacitance

Capacitance is the property of storing charge when there is a potential difference between conductors. Its calculation formula is: C = q/U, and the unit is Farad (F). In motor insulation measurement, the capacitance value reflects the performance of the insulation material.

Dielectric Dissipation Factor

The dielectric loss factor is the ratio of the imaginary part to the real part of the complex relative permittivity, and the formula is: tan δ = ε''/ε'. The smaller the value, the better the insulation performance.

Measurement Principles and Equipment Specifications

Measurement Items	Requirements	Standard Basis
Test Voltage Source	Power frequency high voltage test equipment, the output complies with GB/T16927.1.	- GB/T 16927.1 High Voltage Test Technology Part 1
Dielectric loss factor bridge	The measurement error does not exceed 0.2% or 10%, and supports grounded sample measurement.	- GB/T 34665—2017 Section 4.4

Comparison of single coil and complete winding measurement

Single coil measurement characteristics

Applicable to coils with completed insulation curing.
It is recommended to use a three-electrode system to ensure measurement accuracy.
Focus on the dielectric loss factor increment under partial discharge starting voltage.

Characteristics of whole machine winding measurement

Applicable to assembled motor windings.
Consider the influence of cooling system (such as water cooling) on the measurement results.
Obtain more accurate dielectric loss factor values through phase measurement and correction calculation.

Implementation suggestions

In actual applications, it is recommended to:

Measure strictly according to the voltage points specified in the standard (such as 0.2UN, 0.6UN, 1.0UN).
Repeat the test under high temperature and humidity conditions to evaluate the stability of insulation performance.
Regularly calibrate the measuring equipment to ensure that its accuracy meets the requirements.

More samples: DL/T 5154-2012 JC/T 2453-2018 YD/T 3934-2021

Sample only — not a preview of GB/T 34665-2017

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