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Study on Radio Interference of AC Ultra High Voltage Transmission Lines

Author: ZhouYiFeng
Tutor: LinFuChang
School: Huazhong University of Science and Technology
Course: High Voltage and Insulation Technology
Keywords: UHV Corona Radio Interference Excitation function
CLC: TM937.3
Type: Master's thesis
Year: 2011
Downloads: 33
Quote: 0
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Abstract


Radio interference is an important limiting factor to select a wire and towers parameters largely affect the cost of construction of power grids . UHV AC transmission line voltage level is high , more complex electromagnetic environment research UHV radio interference problem has a very important theoretical and practical significance . From the analysis of the wire surface field strong start , the conductor surface field strength to the UHV same tower double circuit transmission line , for example calculated based the Markt-Megele law and step - by - step method of images , analysis of the strong influence of line structure parameters on the wire surface field , and a numerical example to prove the correctness of the procedure in this article . Excitation function method is an important reference for UHV AC transmission lines calculated radio interference method . This paper into the details of the the corona current generation and dissemination , and stimulate the function of the meaning of the law and the process of calculation of radio interference . By example than with other units and literature , the calculation error does not exceed 5% , proved the correctness and reliability of the results of the calculation of this article . The number of wires split , split spacing , sub conductor cross-section , wire height is an important factor affecting the radio interference , we systematically analyzed the influence of these factors . The calculation results show that : the number of wires split for each additional one radio interference dropped by approximately 4dB . The level of radio interference as the separatist spacing changes showing a U-shaped change . For this article example , 8 × 630mm to wire radio interference minimum value corresponding to the spacing of the split is about 30cm. Line -to-ground height increase phase away from the edge at 20m radio interference with the conductor pair , little change in the increase in height , can be considered the lead height to radio interference effects can be ignored . Soil resistivity increases , accelerated the decay of corona current in the dissemination process , reduce radio interference .

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CLC: > Industrial Technology > Electrotechnical > Electrical measurement techniques and instruments > Measurement and instrumentation of the electromagnetic field strength ( signal strength ) > Interference measurements, the interferometer
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