NDLI: Advanced possibilities of synchronous conventional and UHF PD measurements for effective noise suppression

Content Provider	IEEE Xplore Digital Library
Author	Kraetge, A. Hoek, S. Rethmeier, K. Krüger, M. Winter, P.
Copyright Year	2010
Description	Author affiliation: OMICRON electronics GmbH, Oberes Ried 1, 6833 Klaus, Austria (Kraetge, A.; Hoek, S.; Rethmeier, K.; Krüger, M.) \|\| OMICRON electronics Corp USA, 50 Hershberger Lane, Grantsville, MD 21536, USA (Winter, P.)
Abstract	On-site PD measurements are usually intensively interfered by external disturbances such as corona from nearby systems and switching activity from the grid, respectively. Therefore, very often no clear assignment of PD sources to the tested object is possible. However, a substantiated risk assessment requires such assignment and, even more, an identification and location of the PD fault. As the conventional PD measurement methods according to IEC 60270 are sensitive to external interferences, UHF detection methods become more and more popular because of their high level of noise suppression. This is based on the fact that most noise signals do not contain frequency contents of several hundreds of MHz. Thus a special UHF sensor mounted close or even inside the object to be tested permits a sensitive focusing on partial discharges as external noise and disturbances are highly attenuated. Hence, UHF signal detection ensures a high level of sensitivity and selectivity, respectively [1]. As a major disadvantage, UHF measurements cannot be calibrated in terms of PD charge magnitudes. With international standards implying limit values (pass / fail criteria) specified in pico-Coulombs, PD measurements need a valid calibration to deliver comparable results. The classical way to combine the UHF sensitivity and the calibrated IEC compliant measurement consists of two consecutive PD measurements using different frequency spectra. With a highly disturbed IEC-range, this may not be possible at all. With a modern synchronous PD measuring system it is possible to perform these two measurements simultaneously. Additionally, and as a main benefit, it is possible to use the UHF PD data as trigger source for the conventional electrical PD measurement. This allows detecting PD with a high sensitivity and selectivity in the UHF-range, but allocating the appropriate PD level in terms of pico-Coulombs with the calibrated IEC-compliant PD detection. Examples will be presented in the following.
Starting Page	1
Ending Page	4
File Size	815717
Page Count	4
File Format	PDF
ISBN	9781424462988
ISSN	1089084X
e-ISBN	9781424463015
DOI	10.1109/ELINSL.2010.5549805
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-06-06
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Noise measurement UHF measurements Partial discharges Testing Frequency measurement Corona Risk management Fault diagnosis IEC standards Interference suppression
Content Type	Text
Resource Type	Article

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2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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Combining synchronous UHF and IEC-compliant PD measurements for an effective noise suppression

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On-site experiences with multi-terminal IEC PD measurements, UHF PD measurements and acoustic PD localisation

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Advanced possibilities of synchronous conventional and UHF PD measurements for effective noise suppression

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