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BSI DD IEC/TS 61934:2011

BSI DD IEC/TS 61934:2011

$167.15

Electrical insulating materials and systems. Electrical measurement of partial discharges (PD) under short rise time and repetitive voltage impulses

Published By Publication Date Number of Pages
BSI 2011 34
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IEC/TS 61934, which is a technical specification, is applicable to the off-line electrical measurement of partial discharges (PD) that occur in electrical insulation systems (EIS) when stressed by repetitive voltage impulses generated from electronic power devices.

Typical applications are EIS belonging to apparatus driven by power electronics, such as motors, inductive reactors and windmill generators.

NOTE 1 Use of this technical specification with specific products may require the application of additional procedures.

NOTE 2 The procedures described in this technical specification are emerging technologies. Experience and caution, as well as certain preconditions, are needed to apply it.

Excluded from the scope of this technical specification are

  • methods based on optical or ultrasonic PD detection,

  • fields of application for PD measurements when stressed by non-repetitive impulse voltages such as lightning impulse or switching impulses from switchgear.

PDF Catalog

PDF Pages PDF Title
4 CONTENTS
6 FOREWORD
8 INTRODUCTION
9 1 Scope
2 Normative references
3 Terms and definitions
11 4 Measurement of partial discharge pulses during repetitive, short rise-time voltage impulses and comparison with power frequency
4.1 Measurement frequency
4.2 Measurement quantities
12 4.3 Test objects
4.4 Impulse generators
13 4.5 Effect of testing conditions
Table 1 – Example of parameter values of impulse voltage waveform without load
14 5 PD detection methods
5.1 General
5.2 PD pulse coupling and detection devices
15 Figure 1 – Coupling capacitor with multipole filter
16 Figure 2 – Example of voltage impulse and PD pulse frequency spectra before and after filtering
Figure 3 – HFCT between supply and test object with multipole filter
17 Figure 4 – HFCT between test object and earth with multipole filter
Figure 5 – Circuit using an electromagnetic coupler (for example an antenna) to suppress impulses from the test supply
Figure 6 – Circuit using an electromagnetic UHF antenna
18 Figure 7 – Example of waveforms of repetitive bipolar impulse voltage and charge accumulation for a twisted-pair sample
Figure 8 – Charge measurements
19 5.3 Source-controlled gating techniques
6 Measuring instruments
7 Sensitivity check of the PD measuring equipment
7.1 General
Figure 9 – Example of PD detection using electronic source-controlled gating(other PD coupling devices can be used)
20 7.2 Test diagram for sensitivity check
7.3 PD detection sensitivity check
Figure 10 – Test diagram for sensitivity check
22 9 Test report
Figure 12 – Example of increasing and decreasing the impulse voltage magnitude
24 Annex A (informative) Voltage impulse suppression required by the coupling device
Figure A.1 – Example of overlap between voltage impulseand PD pulse spectra (dotted area)
Figure A.2 – Example of voltage impulse and PD pulse spectra after filtering
25 Figure A.3 – Example of impulse voltage damping as a function of impulse voltage magnitude and rise time
26 Annex B (informative) PD pulses extracted from a supply voltage impulsethrough filtering techniques
Figure B.1 – Power supply waveform and recorded signalusing an antenna during supply voltage commutation
27 Figure B.2 – Signal detected by an antenna from the recordof Figure B.1, using a filtering technique (400 MHz high-pass filter)
Figure B.3 – Characteristic of the filter used to pass from Figure B.1 to Figure B.2
28 Annex C (informative) Result of round-robin tests of RPDIV measurement
Figure C.1 – The sequence of negative voltage impulses used for RRT
Figure C.2 – PD pulses (under) corresponding to voltage impulses (above)
29 Figure C.3 – Dependence of normalized RPDIV on 100 data (NRPIV/100) on relative humidity (A-F indicates the participants of RRT)
30 Annex D (informative) Examples of noise levels of practical PD detectors
Table D.1 – Examples of bandwidths and noise levels for practical PD sensors
31 Bibliography

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BSI DD IEC/TS 61934:2011
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