Method for reducing passive jamming of ultra high voltage alternating current transmission line to radio station

A UHV AC and radio station technology, applied in the field of passive interference, can solve problems such as the difficulty of line and radio station site selection

Inactive Publication Date: 2012-02-01
STATE GRID ELECTRIC POWER RES INST
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Problems solved by technology

For 1000kV transmission lines, there is no standard for protection requirements. At the same time, in order to meet the needs of national development, 1000kV transmission lines and radio stations will be constructed more vigorously. The dwin...

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  • Method for reducing passive jamming of ultra high voltage alternating current transmission line to radio station
  • Method for reducing passive jamming of ultra high voltage alternating current transmission line to radio station
  • Method for reducing passive jamming of ultra high voltage alternating current transmission line to radio station

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Embodiment

[0047] Among various types of radio 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 2 ). figure 2 The direction diagram of the small base DF antenna and the process of DF error generation under the influence of secondary radiation are given in . 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 degree of the i...

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Abstract

The invention relates to a method for reducing the passive jamming of an ultra high voltage alternating current transmission line to a radio station. In the method, metal obstacles such as high-voltage overhead lines, iron towers and the like in the vicinity of antennae of the radio station are taken as equivalent receiving antennae, and magnetic rings are arranged on overhead ground wires to control the magnitude of the passive jamming. The method comprises the following steps of: establishing a magnetic ring model by adopting Jiles-Atherton, introducing the magnetic ring model into an ultra high voltage alternating current transmission line model to calculate the distribution of current on the ultra high voltage alternating current transmission line, further calculating a secondary radiation intensity vector produced by induced current according to the calculated distribution of the induced current on the transmission line, superposing the secondary radiation intensity vector and original radio waves to calculate the influence degree of the passive jamming of the ultra high voltage alternating current transmission line to the radio station and regulating parameters of the magnetic rings, thereby reducing the passive jamming of the ultra high voltage alternating current transmission line. The method is relatively more highly accurate, and can be applied to the shortening of an electromagnetic protection interval between the ultra high voltage alternating current transmission line and an adjacent radio station in future.

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 method for reducing the passive interference of 1000kV ultra-high voltage AC lines to radio stations. Background technique [0002] The iron tower of the high-voltage transmission line can be regarded as a vertical grounding body. The overhead ground wire connects these vertical grounding bodies to form a multi-grid loop. When radio waves propagate to the transmission line, the transmission line will generate an induced potential, and then form an induced current. New electromagnetic waves are generated, and the radio waves are superimposed on the original radio waves, which may affect the normal operation of nearby radio stations, that is, passive interference. The existing protection measures are to keep a minimum distance between the transmission line and the radio station, that is, the pro...

Claims

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Application Information

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IPC IPC(8): H04B15/00H02G7/00
Inventor 刘兴发张建功倪园路遥
Owner STATE GRID ELECTRIC POWER RES INST
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