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Research on Corona Characteristics of Single Conductor Under Foul Based on the Small Corona Cage

Author: ZengWenFang
Tutor: LiuYunPeng
School: North China Electric Power University
Course: High Voltage and Insulation Technology
Keywords: Corona cage Corona inception voltage Corona loss Filthy
CLC: TM83
Type: Master's thesis
Year: 2011
Downloads: 42
Quote: 1
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Abstract


AC and DC transmission line corona phenomenon caused by the the corona ion current, corona loss, radio interference and audible noise and other adverse consequences, it is closely related to the electromagnetic environment and transmission lines. With the improvement of the transmission line voltage levels, the electromagnetic environmental issues must be included in a range of important issues to be considered in the design, construction and operation of ultra-UHV AC and DC transmission lines. Wire corona loss under different surface conditions is of great significance for guiding the different climatic regions of the design and construction of high voltage transmission lines. Research Transmission Line the various wires corona characteristics of an effective and economical method is corona cage test, it can simulate the situation of the surface electric field intensity of the actual transmission line conductor, the conductors are widely used corona characteristic. The paper first discusses the problem of the electrical parameters of the corona cage design, structure parameter selection, mechanical design and measurement applications, design and manufacture of a small laboratory corona cage. Small corona cage-section side length of 1.8 meters, 4 meters long, 0.5 meters long protective sections at each end. Small corona cage device in the experimental study of a single smooth wire and ACSR conductor surface is clean and unclean corona inception voltage and different voltage corona loss values. By corona cage clean and smearing under the conditions of the corona test on the smooth surface of the wire, the corona loss of the smooth wire. Smooth wire corona inception voltage than clean corona inception voltage in filthy conditions, a decrease of 28.63%. Defaced smooth wire under the corona loss greater than the loss of clean corona. When voltage is applied to 140kV, the defaced smooth wire corona loss than the loss of clean corona large 29.9W / m. Added to 140kV for ACSR, voltage, corona loss values ??the wire LGJ-300/40 in the clean and unclean conditions were 22.67W / m and 54.65 W / m. The corona LGJ-300/40 clean and unclean conditions starting the voltages were 119.47kV and 80.00kV. Clean conditions stranding corona inception voltage is higher than the corona inception voltage under filthy conditions. The waste particles change the surface condition of the wire so that the wire surface of the corona inception field strength decreased, on the other hand, the presence of the unclean particles corona inception field strength reaches the wire surface of the wire in the lower voltage.

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CLC: > Industrial Technology > Electrotechnical > High Voltage Engineering > High voltage test equipment and measurement techniques
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