Academic
Publications
Partial Discharge Measurements on Components Energized by Power Electronic Frequency Converters

Partial Discharge Measurements on Components Energized by Power Electronic Frequency Converters,Florian Martin,Thomas Leibfried

Partial Discharge Measurements on Components Energized by Power Electronic Frequency Converters  
BibTex | RIS | RefWorks Download
The voltage source used for testing electrical equipment has to achieve special requirements, which are noted in the international standards. Still today the test voltages for routine- and type tests of utilities for the power en- gineering are generated by motor-generator sets. Attempting to replace the m.-g. sets with static fre- quency converters, two major problems occur in im- plementing this technology for testing applications: the insufficient quality of the output voltage and the high background noise for partial discharge (pd) measure- ments. This paper deals with the reasons for the high interference level and the elimination of disturbing emission. Nowadays static frequency converters are commonly used in the drive and powertrain technologies, where they, more or less, displace the frequency converters based on motor-generator sets entirely. The classic mo- tor-generator sets (m.-g. sets) are still in use for the test engineering all over the world, generating sinusoidal voltages with frequencies up to 200 Hz. Actual research activities aim to substitute this equipment with static, power semiconductor based, converters providing vari- able output-frequencies. The main reasons for the re- placement of rotating machinery in this area are high investment costs and difficulties in acquisition and transportation. Of course the requirements imposed by international standards still have to be fulfilled satisfac- torily. Implementing this technology two major problems oc- cur: the quality of the output voltage and the partial discharge background noise. Both problems are so ex- tensive that they should not be discussed in one paper. Hence this paper presents the issue of pd measurements being disturbed by frequency converters used as voltage source. A method to obtain a satisfying sinusoidal volt- age form can be gleaned in (1). Good examples for the requirements of the pd- measurements are the conditions demanded for trans- former testing. The maximum background noise level of 100 pC for the accompanying measurement during the long duration AC induced voltage test is given in 60076-3 (6). Special customer requirements can exceed this limit and demand 50 pC or less.
Cumulative Annual
View Publication
The following links allow you to view full publications. These links are maintained by other sources not affiliated with Microsoft Academic Search.