New differential busbar characteristic based on high frequencies extracted from faulted signal during current transformer saturation. Issue 4 (1st April 2014)

• Record Type: Journal Article
• Authors: Eissa, M.M.
• Is Part Of: IET generation, transmission & distribution. Volume 8:Issue 4(2014)
• Page Start: 619
• Page End: 628
• Publication Date: 2014-04-01
• Subjects: busbars -- current transformers -- fault diagnosis -- power transformers -- transient analysis -- wavelet transforms; faulted signal -- current transformer saturation -- differential measurement -- continuous wavelet transform -- frequency localisation property -- time localisation property -- transient characteristic analysis -- defect signals -- CT saturation -- fault‐generated transients -- busbar protection zone -- differential busbar characteristic -- windowed WT; Electric power production -- Periodicals; Electric power transmission -- Periodicals; Electric power distribution -- Periodicals; 621.3105
• DOI: 10.1049/iet-gtd.2013.0038
• Languages: English
• ISSNs: 1751-8687

Abstract

Abstract : Most given techniques tend to block the differential measurement during that portion of the cycle when a current transformer (CT) is saturated. Some other techniques bring more meaning to the breakpoint settings of the operating characteristic. The time and frequency localisation properties of continuous wavelet transform (WT) offer a viable and improved option for analysing the transient characteristics of defect signals. WT depends on high frequencies of the faulted signal produced due to CT saturation. The proposed technique is based on the windowed WT of fault‐generated transients to distinguish between faults in a busbar protection zone from those outside the zone, particularly in case of an early and severe CT saturation. New differential busbar characteristic with values depending on the windowed WT of fault‐generated transients has also been described.