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Method for confirming protection distance between extra-high voltage alternating current line and medium wave navigation station

A UHV AC and protection distance technology, applied in the fields of electromagnetic field characteristics, antenna radiation patterns, measuring devices, etc., can solve the problems of limited passive interference research work

Active Publication Date: 2008-07-16
STATE GRID ELECTRIC POWER RES INST
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Problems solved by technology

[0004] At present, there are mature calculation models for active interference, but the research work on passive interference is still very limited. The relevant provisions of the current national standards are mainly determined based on the maximum resonance point estimated by the height of a single high-voltage iron tower and the protection between stations. distance, usually has a large safety margin, and lacks a model for more accurate protection calculations based on actual line conditions

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  • Method for confirming protection distance between extra-high voltage alternating current line and medium wave navigation station
  • Method for confirming protection distance between extra-high voltage alternating current line and medium wave navigation station
  • Method for confirming protection distance between extra-high voltage alternating current line and medium wave navigation station

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Embodiment

[0059] Among various types of stations, medium-wave navigation stations are most susceptible to errors caused by secondary radiation. At present, the aeronautical radio direction finder widely used in our country has a rectangular antenna array with a pattern of Arabic numeral 8. By rotating the antenna, the signal on the entire 360° range is searched to find the maximum value of the antenna port voltage (that is, the loud sound point ) or the minimum value (that is, the small sound point) to determine the incoming wave direction (Figure 5). Figure 5 shows the direction diagram of the small-based direction-finding antenna and the process of direction-finding error generation when it is affected by secondary radiation. The in-phase component of the electromotive force induced by the secondary radiation electromagnetic field in the direction-finding antenna array will enhance or reduce the original signal, directly causing direction-finding errors; Obtaining the directional deg...

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Abstract

The invention relates to a method for determining the protective distance between an AC line with extra-high voltage and a medium wave navigation station, which adopts the method of moments for computing the electric current distribution on the AC transmission line with extra-high voltage and a simplified model of the AC transmission line with extra-high voltage; furthermore, the method comprises the following steps: firstly the method adopts the method of moments and the simplified model of the AC transmission line with extra-high voltage for computing the electric current distribution on the AC transmission line with extra-high voltage, computes a secondary radiation intensity vector which is generated by the induction current according to the acquired induction current distribution on the electric current transmission line, implements the superimposing of the secondary radiation intensity vector and a source radio wave, and computes the interference influence intensity of the AC transmission line with the extra-high voltage of 1000 kilovolts on a medium wave navigation station, thus acquiring the protective distance for the passive jamming between the AC transmission line with extra-high voltage and the medium wave navigation station. The test data comparison acquired from a test proves that the method for determining the protective distance between the AC line with extra-high voltage and the medium wave navigation station has higher accuracy and is applicable for the precise computation of the electromagnetic protective distance between an electric current transmission line with high voltage and an adjacent radio station in the future.

Description

technical field [0001] The invention belongs to the field of electromagnetic compatibility of high-voltage power transmission and transformation engineering, and specifically relates to a method for determining the protection distance between a 1000kV ultra-high voltage AC line and a medium-wave navigation station. 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. ...

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Application Information

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IPC IPC(8): G01R31/00G01R29/08G01R29/10
Inventor 刘兴发万保权王勤张业茂
Owner STATE GRID ELECTRIC POWER RES INST
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