Method for researching and treating heating of cable grounding wire adjacent to three-phase reactor

Abstract

The invention relates to the technical field of electric reactors, in particular to a cable grounding wire heating research and treatment method adjacent to a three-phase electric reactor. The method comprises the following steps of obtaining magnetic line distribution of a space around the three-phase reactor and a current value of an armor layer grounding wire; establishing a finite element model, and loading the armor layer grounding wire current value as excitation to the cable terminal for flow field and temperature field finite element numerical calculation to obtain the temperature distribution condition of the cable terminal; the method comprises the following steps of: establishing different laying types of magnet vanes for finite element numerical analysis to obtain a current value of an armor layer grounding wire, then calculating to obtain a temperature distribution condition of the magnet vanes, and comparing and analyzing the temperature of the magnet vanes and the environment temperature to obtain a current value of the armor layer grounding wire. And a magnet vane which is not greatly different from the environment temperature is selected as a heating treatment measure of the cable grounding wire near the three-phase reactor. The influence of temperature on the magnet vane is considered, and the treatment effect is improved.

Description

technical field [0001] The invention relates to the technical field of reactors, in particular to a research and treatment method for heat generation of a cable ground wire adjacent to a three-phase reactor. Background technique [0002] As one of the main inductive components of the AC transmission system, the dry-type air-core reactor has the advantages of low loss, low noise, simple maintenance, good linearity of reactance value, and long design life. It has been more and more widely used in the power grid. However, due to the special structure of the dry-type air-core reactor, it will generate a symmetrical and divergent magnetic field during normal operation, which poses a threat to the normal operation of nearby instruments and meters, and will induce eddy currents on the metal conductors and closed circuits adjacent to the reactor. And circulation, causing heat, causing fire accidents, affecting the normal operation of the substation. [0003] At present, the researc...

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Problems solved by technology

However, due to the special structure of the dry-type air-core reactor, it will generate a symmetrical and divergent magnetic field during normal operation, which poses a threat to the normal operation of nearby instruments and meters, and will induce eddy currents on the metal conductors and closed circuits adjacent to the reactor. And circulation, causing heat, causing fire accidents, affecting the normal operation of substations

[0003] At present, the research on the treatment of abnormal heating of equipment near the reactor mainly focuses on the problem of heating of adjacent equipment under the action of single-phase reactor leakage magnetic field, and puts forward various control measures, such as increasing the distance between the reactor and the closed metal circuit, Close the metal circuit, add shielding to the reactor, etc., but for the heating problem of the adjacent cable grounding wire caused by the joint action of the three-phase reactors in the substation where the layout of the electrical equipment has been determined, the measures to change the location of the equipment cannot be realized, and the countermeasures should be taken. The measure of adding a shield to the reactor is difficult to construct, the economic efficiency is low, and it will affect the safe operation of the reactor. Therefore, the traditional treatment measures are no longer suitable for solving the heating problem of the cable grounding wire near the three-phase reactor. The adjacent three-phase reactor installed with the magnetic isolation board improves the interference of the magnetic field, but the relationship between the temperature of the magnetic isolation board and the ambient temperature is not analyzed, which causes the ambient temperature to affect the magnetic isolation effect of the magnetic isolation board, which is not conducive to the research and management of the heating of the cable grounding wire , in view of this, we propose a research and treatment method for the heating of the cable grounding wire adjacent to the three-phase reactor

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