GB/T 20833.1-2021 English PDF (GBT20833.1-2021)

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GB/T 20833.1-2021: Rotating electrical machines -- The winding insulation -- Part 1: Off-line partial discharge measurements
GB/T 20833.1-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.160.01
K 20
GB/T 20833.1-2021 / IEC 60034-27-1:2017
Replacing GB/T 20833.1-2016
Rotating Electrical Machines – The Winding Insulation –
Part 1: Off-Line Partial Discharge Measurements
(IEC 60034-27-1:2017, Rotating Electrical Machines – Part 27-1: Off-
Line Partial Discharge Measurements on the Winding Insulation, IDT)
ISSUED ON: MARCH 09, 2021
IMPLEMENTED ON: OCTOBER 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 6
1 Scope ... 8
2 Normative References ... 9
3 Terms and Definitions ... 9
4 Nature of PD in Rotating Machines ... 12
5 Measuring Technologies and Instrumentation ... 15
6 Visualization of Measurements ... 18
7 Test Circuits ... 21
8 Normalization of Measurements ... 27
9 Test Procedures ... 30
10 Interpretation of Test Results ... 36
11 Test Report ... 42
Annex A (Informative) Influence Parameters of Test Frequency to Testing Procedure
... 46
Annex B (Informative) Alternative Methods to Determine Discharge Magnitudes ... 48
Annex C (Informative) Other Off-Line Methods for PD Detection and Methods for
Localization ... 51
Annex D (informative) External noise, Disturbance and Sensitivity ... 53
Annex E (informative) Methods of Disturbance Suppression ... 57
Annex F (informative) Interpretation of PD Magnitude Data and Phase Resolved PD
Patterns ... 63
Annex G (informative) Test Circuits for Complete Windings ... 68
Annex H (Informative) Wide-Band and Narrow-Band Measuring Systems ... 74
Bibliography ... 76
Foreword
GB/T 20833 Rotating Electrical Machines – The Winding Insulation can be divided into the
following 4 parts:
--- Part 1: Off-Line Partial Discharge Measurements;
--- Part 2: On-Line Partial Discharge Measurements;
--- Part 3: Dielectric Dissipation Factor Measurement;
--- Part 4: Measurement of Insulation Resistance Polarization Index.
This Part is Part 1 of GB/T 20833.
This Part was drafted as per the rules stipulated in GB/T 1.1-2009.
This Part replaced GB/T 20833.1-2016 Rotating Electrical Machines – The Stator Winding
Insulation of Rotating Electrical Machines – Part 1: Off-Line Partial Discharge Measurements.
Compared with GB/T 20833.1-2016, the major technical changes of this Part are as follows:
--- Modify the Scope of the standard and Normative References (see Clause 1 and Clause 2
of this Edition; Clause 1 and Clause 2 of the 2016 Edition);
--- Add Terms and Definitions (see Clause 3 of this Edition);
--- Modify the nature of partial discharge in the motor (see Clause 4 of this Edition; Clause
4 of the 2016 Edition);
--- Modify the impact of measuring instruments (see 5.4 of this Edition; 5.4 of the 2016
Edition);
--- Modify the minimum range of partial discharge data expression (see 6.2 of this Edition;
6.2 of the 2016 Edition);
--- Add calibration pulse level and tolerance (see 7.1 of this Edition);
---Modify the standard measurement (see 7.3.2 and 7.3.3 of this Edition; 7.3.2 of the 2016
Edition);
--- Add the use of integrated test equipment (see 7.3.4 of this Edition);
--- Modify the partial discharge measurement of windings and winding components (see 9.1
of this Edition; 9.1 of the 2016 Edition);
--- Delete the electromagnetic probe (see 9.2.2 of the 2016 Edition);
--- Modified the evaluation of test results (see 10.1, 10.2.1 and 10.3.1 of this Edition; 10.1,
10.2.1 and 10.3.1 of the 2016 Edition);
--- Delete the annex of on-line partial discharge measurement (see Annex A of the 2016
Edition);
--- Add the influence of the test frequency parameter on the test process (see Annex A of this
Edition);
--- Add other methods for determining the amplitude of partial discharge (see Annex B of
this Edition);
--- Modify the method of off-line partial discharge detection and off-line location (see Annex
C of this Edition, Annex B of the 2016 Edition);
--- Add interpretation of partial discharge measurement and induction discharge/vibration
spark from terminal and star-connected neutral point (see Annex D of this Edition);
--- Add the complete winding measurement connection circuit (see Annex G of this Edition);
--- Modify the broadband and narrowband systems (see Annex H, 5.4 of the 2016 Edition).
This Part used translation method to equivalently adopt IEC 60034-27-1:2017 Rotating
Electrical Machines – Part 27-1: Off-Line Partial Discharge Measurements on the Winding
Insulation.
The Chinese documents that have consistent correspondence with the international documents
cited in this part are as follows:
--- GB/T 7354-2018 High-voltage test techniques - Partial discharge measurements (IEC
60270-2000, MOD);
--- GB/T 16927.1-2011 High-voltage test techniques—Part 1: General definitions and test
requirements (IEC 60060-1:2010, MOD);
--- GB/T 16927.2-2013 High-voltage test techniques - Part 2: Measuring systems (IEC
60060-2:2010, MOD);
--- GB/T 17948.4-2016 Rotating electrical machines - Functional evaluation of insulation
systems - Test procedures for form-wound windings - Evaluation by electrical endurance
(IEC 60034-18-32:2010, IDT);
--- 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 (IEC 60034-18-42:2017, IDT);
--- GB/T 20833.2-2016 Rotating electrical machines - The stator winding insulation of
Rotating Electrical Machines – The Winding Insulation –
Part 1: Off-Line Partial Discharge Measurements
1 Scope
This Part of GB/T 20833 provides a common basis with respect to partial discharge off-line
measurements on the winding insulation of rotating electrical machines:
– measuring techniques and instruments;
– the arrangement of test circuits;
– normalization and testing procedures;
– noise reduction;
– the documentation of test results;
– the interpretation of test results.
The measurement methods described in this document are applicable to stator windings of
machines with or without conductive slot coating and to the stator windings of machines made
with form wound or random wound windings. In special cases like high voltage rotor field
windings, this document is applicable as well. The measurement methods are applicable when
testing with alternating sinusoidal voltages from 0.1 Hz up to 400 Hz; see Annex A.
Interpretation guidelines are given in this document and are applicable only if all the following
requirements are fulfilled:
– Measurements performed with power frequency of 50 Hz or 60 Hz, or when testing with
power supply within a frequency range of 45 Hz to 65 Hz.
– Form wound windings and winding components such as bars and coils.
– Winding with conductive slot coating. This is usually valid for machines with voltage
rating of 6 kV and higher.
For machines with random wound windings, form-wound windings without conductive slot
coating, and testing at frequencies differing from power frequencies, the interpretation
guidelines are not applicable. The testing procedures for off-line PD-measurements of this
document can be used for assessing the uniform quality of manufacturing or/and the trending
of these kind of windings as well as converter driven machine windings.
NOTE: Testing of low voltage machines with so called ...