NDLI: Interference monitoring during the factory PD tests of ±800kV converter transformer

Content Provider	IEEE Xplore Digital Library
Author	Bo Qi Zongwang Zhu Hongxin Ji Chengrong Li Linjie Zhao Ruihai Li
Copyright Year	2015
Description	Author affiliation: Electr. Power Res. Inst., China Southern Power Grid, Guangzhou, China (Linjie Zhao; Ruihai Li) \|\| State Key Lab. of Alternate Electr. Power, North China Electr. Power Univ., Beijing, China (Bo Qi; Zongwang Zhu; Hongxin Ji; Chengrong Li)
Abstract	Partial discharge (PD) level under the specified AC/DC test voltages, which is one key parameter indicating the insulation reliability of ultra-high voltage direct current (UHVDC) converter transformers, do not often be accurately determined due to the impact of the external electromagnetic interference. To solve this problem, a method that uses the ultra-high frequency (UHF) technology to monitor the PD interferences was brought forward in this paper, and was applied to the factory tests of a ± 800kV converter transformer. The results show that the waveform characteristic of the UHF detection signals can be well used for recognizing the interferences caused by communication equipment, as well as the phase distribution characteristics of the UHF detection signals for the floating potential discharge and the point discharge induced by various types of AC / DC test voltages. The results also confirm that the floating discharge spots and the point discharge spots can be quickly and accurately located by analyzing the arriving time difference of RF signals at the different sensors of the UHF antenna array. Based on the monitoring results, the PD interference sources were well treated and then the ± 800kV converter transformer smoothly passed the partial discharge measurements. The research results will be further deployed to the similar work of the UHVDC converter transformers in the converter stations.
Starting Page	270
Ending Page	273
File Size	544877
Page Count	4
File Format	PDF
ISBN	9781479973521
e-ISBN	9781479973545
DOI	10.1109/ICACACT.2014.7223484
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-06-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency measurement Monitoring Partial discharges Discharges (electric) Power systems Power measurement location converter transformer partial discharge interference UHF
Content Type	Text
Resource Type	Article

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