IEC TS 61934:2011

IEC/TS 61934 ®
Edition 2.0 2011-04
TECHNICAL
SPECIFICATION
colour
inside
Electrical insulating materials and systems – Electrical measurement of partial
discharges (PD) under short rise time and repetitive voltage impulses

IEC/TS 61934:2011(E)
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IEC/TS 61934 ®
Edition 2.0 2011-04
TECHNICAL
SPECIFICATION
colour
inside
Electrical insulating materials and systems – Electrical measurement of partial
discharges (PD) under short rise time and repetitive voltage impulses

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
U
ICS 17.220.99; 29.035.01; 29.080.30 ISBN 978-2-88912-479-4

– 2 – TS 61934 © IEC:2011(E)
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Measurement of partial discharge pulses during repetitive, short rise-time voltage
impulses and comparison with power frequency . 9
4.1 Measurement frequency . 9
4.2 Measurement quantities . 9
4.3 Test objects. 10
4.3.1 General . 10
4.3.2 Inductive test objects . 10
4.3.3 Capacitive test objects. 10
4.3.4 Distributed impedance test objects . 10
4.4 Impulse generators . 10
4.4.1 General . 10
4.4.2 Impulse waveforms . 11
4.5 Effect of testing conditions . 11
4.5.1 General . 11
4.5.2 Effect of environmental factors . 12
4.5.3 Effect of testing conditions and ageing . 12
5 PD detection methods . 12
5.1 General . 12
5.2 PD pulse coupling and detection devices . 12
5.2.1 Introductory remarks . 12
5.2.2 Coupling capacitor with multipole filter . 13
5.2.3 HFCT with multipole filter . 14
5.2.4 Electromagnetic couplers . 15
5.2.5 Charge measurements . 16
5.3 Source-controlled gating techniques . 17
6 Measuring instruments . 17
7 Sensitivity check of the PD measuring equipment . 17
7.1 General . 17
7.2 Test diagram for sensitivity check . 18
7.3 PD detection sensitivity check . 18
7.4 Background noise check . 19
7.5 Detection system noise check . 19
7.6 Sensitivity report . 19
8 Test procedure for increasing and decreasing the repetitive impulse voltage
magnitude . 19
9 Test report. 20
Annex A (informative) Voltage impulse suppression required by the coupling device . 22
Annex B (informative) PD pulses extracted from a supply voltage impulse through
filtering techniques . 24
Annex C (informative) Result of round-robin tests of RPDIV measurement . 26
Annex D (informative) Examples of noise levels of practical PD detectors . 28

TS 61934 © IEC:2011(E) – 3 –
Bibliography . 29

Figure 1 – Coupling capacitor with multipole filter . 13
Figure 2 – Example of voltage impulse and PD pulse frequency spectra before and
after filtering . 14
Figure 3 – HFCT between supply and test object with multipole filter . 14
Figure 4 – HFCT between test object and earth with multipole filter . 15
Figure 5 – Circuit using an electromagnetic coupler (for example an antenna) to
suppress impulses from the test supply. 15
Figure 6 – Circuit using an electromagnetic UHF antenna . 15
Figure 7 – Example of waveforms of repetitive bipolar impulse voltage and charge
accumulation for a twisted-pair sample . 16
Figure 8 – Charge measurements . 16
Figure 9 – Example of PD detection using electronic source-controlled gating (other
PD coupling devices can be used) . 17
Figure 10 – Test diagram for sensitivity check . 18
Figure 11 – Example of relation between the outputs of LVPG and PD detector . 19
Figure 12 – Example of increasing and decreasing the impulse voltage magnitude . 20
Figure A.1 – Example of overlap between voltage impulse and PD pulse spectra
(dotted area) . 22
Figure A.2 – Example of voltage impulse and PD pulse spectra after filtering . 22
Figure A.3 – Example of impulse voltage damping as a function of impulse voltage
magnitude and rise time . 23
Figure B.1 – Power supply waveform and recorded signal using an antenna during
supply voltage commutation . 24
Figure B.2 – Signal detected by an antenna from the record of Figure B.1, using a
filtering technique (400 MHz high-pass filter) . 25
Figure B.3 – Characteristic of the filter used to pass from Figure B.1 to Figure B.2 . 25
Figure C.1 – The sequence of negative voltage impulses used for RRT . 26
Figure C.2 – PD pulses (under) corresponding to voltage impulses (above) . 26
Figure C.3 – Dependence of normalized RPDIV on 100 data (NRPIV/100) on relative
humidity (A-F indicates the participants of RRT) . 27

Table 1 – Example of parameter values of impulse voltage waveform without load . 11
Table D.1 – Examples of bandwidths and noise levels for practical PD sensors . 28

– 4 – TS 61934 © IEC:2011(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL INSULATING MATERIALS AND SYSTEMS –
ELECTRICAL MEASUREMENT OF PARTIAL DISCHARGES (PD)
UNDER SHORT RISE TIME AND REPETITIVE VOLTAGE IMPULSES

FOREWORD
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