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GB/Z 20833.5-2023Rotating electrical machines - The winding insulation - Part 5: Off-line measurement of partial discharge inception voltage under repetitive impulse voltage (English PDF)

旋转电机绕组绝缘第5部分：重复冲击电压下局部放电起始电压的离线测量

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

September 7, 2023

Implementation date

April 1, 2024

Scope

GB/Z 20833.5-2023 is the English-translated version of 旋转电机绕组绝缘第5部分：重复冲击电压下局部放电起始电压的离线测量.

GB/Z 20833.5-2023 is the Chinese standard "Rotating electrical machines - The winding insulation - Part 5: Off-line measurement of partial discharge inception voltage under repetitive impulse voltage".

Its scope clause reads: This document specifies the offline measurement method of partial discharge onset and extinction voltage of winding insulation under repeated impulse voltages.

This document applies to rotating electrical machines powered by voltage-type frequency converters. Its clauses include normative reference documents; terms and definitions.

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Document preview — GB/Z 20833.5-2023

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

Preface
Introduction
1 Scope
2 Normative reference documents
3 Terms and Definitions
4 Repeated impulse voltage for PD measurements
4.1 Overview
4.2 Single impulse voltage waveform
4.3 Single impulse voltage queue
4.4 Step-by-step voltage boosting and step-by-step voltage reduction of single impulse voltage queue
4.5 Distribution of impulse voltage inside rotating motor
5 PD measurement method under impulse voltage
5.1 Overview
5.2 Electrical PD measurement
5.3 PD detection threshold level
5.4 Impact generator and computer measurement system
5.5 Calculation and interpretation of RPDIV and RPDEV
6 PD test procedures under impact
6.1 Test sample
6.2 Safety and environment during PD testing
6.3 Test procedures and reports
Appendix A (informative) Typical PD measurements on complete windings
Appendix B (informative) Example 24 of PD data analysis using phase angle
Appendix C (informative) Complete winding connection example
Appendix D (informative) Example 30 of SBS boost mode under repeated impact

1 Scope

This document specifies the offline measurement method of partial discharge onset and extinction voltage of winding insulation under repeated impulse voltages.

This document applies to rotating electrical machines powered by voltage-type frequency converters.

2 Normative reference documents

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

For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.

GB/T 23642-2017 Partial discharge (PD) voltage of electrical insulating materials and systems under conditions of instantaneous rise and repeated voltage surges

Gas measurement (IEC TS61934.2011, IDT)

Note. GB/T 20833.1-2021 Rotating electrical machine winding insulation Part 1.Offline partial discharge measurement (IEC 60034-27-1.2017, IDT)

IEC TS61934 Electrical testing of partial discharge (PD) on electrical insulating materials and systems under conditions of transient rise and repeated voltage surges

Note. GB/T 42287-2022 High voltage test technology electromagnetic and acoustic method for measuring partial discharge (IEC TS62478.2016, IDT)

3 Terms and definitions

The terms and definitions defined in IEC 60034-27-1, IEC TS61934 and the following apply to this document.

ISO and IEC maintain terminology databases used for standardization at.

3.1 Partial discharge partialdischarge; PD

An electrical discharge in which the insulation between conductors is only partially bridged. Such discharges may or may not occur near conductors.

3.2

Use the step-by-step voltage boosting method to apply the impulse voltage to the test sample until more than five local impulse voltages with the same peak-to-peak value appear in ten times.

Minimum peak-to-peak impulse voltage of discharge pulse.

Note. For the specified test time and test circuit layout, this value is the average value, and the voltage applied to the test sample adopts the step-by-step voltage boosting method. See 5.5 for details.

3.3

From the higher voltage value where the discharge is observed, the impulse voltage is applied to the test sample using the step-by-step voltage reduction method until ten peak-to-peak impulses occur.

GB/T 20834 | GB/T 20833.1 | GB/T 20140 | GB/T 20833.2 | GB/T 20833.4 | GB/T 20833.3 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 66 pages — is available in the English PDF.

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