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Method for determining level of interference of direct current transmission line to geomagnetic field observation

A technology of DC transmission line and interference level, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of DC line interference, few studies on geomagnetic station observation, etc.

Active Publication Date: 2012-05-02
STATE GRID ELECTRIC POWER RES INST
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Problems solved by technology

[0003] At present, the most research on the relationship between DC lines and geomagnetism at home and abroad is still on the impact of DC currents caused by geomagnetic changes on the power grid, while there are few studies on DC lines interfering with geomagnetic station observations

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  • Method for determining level of interference of direct current transmission line to geomagnetic field observation
  • Method for determining level of interference of direct current transmission line to geomagnetic field observation

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Embodiment Construction

[0015] The present invention will be described in further detail below in conjunction with the accompanying drawings and examples, but these examples should not be construed as limiting the present invention.

[0016] In the present invention, the DC transmission line is divided into multiple line segments with the tower as the point, and the current magnetic field of each line segment at the geomagnetic observation point is respectively solved; then, according to the magnetic field vector superposition principle, the current magnetic field of the whole line at the geomagnetic observation point is obtained , the current magnetic field value can be obtained by subtracting the current magnetic field value from the actual geomagnetic observation value, and the actual geomagnetic field value can be obtained.

[0017] Such as figure 1 As shown, the positions of two adjacent towers in space are respectively A and B, the line between the towers is the current-carrying wire segment AB...

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Abstract

The invention relates to a method for determining a level of interference of a direct current transmission line to geomagnetic field observation. The method comprises the steps of establishing a three-dimensional calculating model of a current magnetic field space of the direct current transmission line and calculating the projection of a vector of the current magnetic field in the direction of a geomagnetic observation factor. Specifically, the method comprises the following steps: with a line span as a minimum calculating unit, establishing the three-dimensional calculating model of the current magnetic field space according to the longitudes, latitudes and altitude coordinates of all pole towers of the direct current transmission line and all geomagnetic stations in difference places based on a magnetic-field vector superposition principle; projecting the calculated vector of the current magnetic field in the direction of the geomagnetic field observation; and finally, acquiring an additional value of the current magnetic field of the direct current transmission line to the geomagnetic field observation, namely the level of the interference of the direct current transmission line to the geomagnetic field observation.

Description

technical field [0001] The invention belongs to the intersection field of high-voltage power transmission and transformation engineering electromagnetic compatibility and the monitoring of the earth's geomagnetic field, and specifically relates to a determination method for accurately solving the interference level of the direct current transmission line to the observation of the geomagnetic field according to the change of the unbalanced current of the direct current transmission line. Background technique [0002] my country is located in an area with frequent seismic activity, and seismic and geomagnetic monitoring stations all over the country undertake the important task of forecasting and monitoring seismic activity, and monitor geological activities by observing changes in the geomagnetic field. It is not easy to distinguish the DC magnetic field and the geomagnetic field signal generated by the DC transmission line under normal operating conditions, but if the transmi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 张小武唐波干喆渊刘兴发
Owner STATE GRID ELECTRIC POWER RES INST
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