Iconic model test method for identifying protection distance between extra-high voltage AC circuit and AM broadcasting
A technology of UHV AC and radio stations, which is applied in the direction of measuring electricity, measuring electric variables, and electromagnetic field characteristics, and can solve problems affecting the normal operation of radio stations, path selection, and project cost increases.
Active Publication Date: 2009-09-09
STATE GRID ELECTRIC POWER RES INST
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Problems solved by technology
However, the electromagnetic environment of UHV is different from that of 500kV lines. What is particularly important is the impact of UHV transmission lines on the adjacent AM radio stations along the line. For 1000kV UHV lines, there is no standard for protection requirements, which not only affects the route selection of projects The project cost will increase many uncertain factors and unnecessary difficulties, and it may also affect the normal operation of adjacent radio stations. Therefore, it is very necessary to study the impact of 1000kV UHV transmission lines on AM radio stations and determine the protection distance
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[0008] The present invention will be described in further detail below in conjunction with examples, but these examples should not be construed as limiting the present invention.
[0009] The interference that high-voltage overhead transmission lines may cause to radio stations can be divided into active interference and passive interference. Active interference is generated by the interference electromagnetic field formed between the wire and the earth, mainly from the corona discharge of the wire; passive interference refers to the associated current generated by high-voltage overhead wires and iron towers excited by the electromagnetic field of radio signals, and radiated to space. This secondary radiation will alter the amplitude and phase of the original radio signal. At present, there are mature calculation models for active interference, but the research work on passive interference is still very limited. If a 1:1 wireless station passive interference test is carried ou...
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The invention relates to a scaled model test method for determining the protection distance between an UHV AC line and an AM broadcasting station. The method adopted is: the size of the real object is reduced according to a certain ratio to make a scaled model, and the antenna is established in a shape similar to that of the real object. Completely or approximately the same miniature antenna model, and the source wavelength of the excitation model is also reduced in the same proportion compared with the actual wavelength being studied, so that the ratio of length to wavelength remains unchanged, and the model antenna and the researched object are working The wavelength has the same electrical parameters and characteristics, and the performance of the researched object can be obtained by measuring the parameters of the model antenna. The invention can be applied to the accurate calculation of the electromagnetic protection distance between the high-voltage transmission line and other types of adjacent radio stations.
Description
technical field [0001] The invention belongs to the field of electromagnetic compatibility of high-voltage power transmission and transformation projects, and specifically relates to a scale model test method for determining the protection distance between (1000kV) ultra-high voltage AC lines and AM broadcasting stations. Background technique [0002] In order to meet the electricity demand for the sustainable development of my country's economy and society, the construction of a strengthened power grid with UHV power grid as the core has become a strategic goal of national power construction. When long-distance and large-capacity transmission is adopted, UHV transmission can effectively save line corridors, help improve network structure, reduce transmission bottlenecks, and achieve a wide range of resource optimization. The economic and social benefits are very obvious. However, the electromagnetic environment of UHV is different from that of 500kV lines. What is particula...
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IPC IPC(8): G01R31/00G01R29/08G01R29/10
Inventor 干喆渊万保权路遥陈豫朝
Owner STATE GRID ELECTRIC POWER RES INST