Method and apparatus for inhibiting non-uniform rain lightning by high-voltage through-wall sleeve

Abstract

The invention discloses a method to prevent high voltage wall bushing flashover under non-uniform rain and corresponding device that can effectively prevent high voltage wall bushing flashover under non-uniform rain. The method is simple in installation and has lower cost, but can effectively settle the problem of bushing flashover under non-uniform rain. The method adopts the basic principle that a uniform rain device that can avoid non-uniform rain moistening is arranged directly above the top of the bushing in order to ensure uniform moistening on the surface of the bushing. When the surface of the bushing is uniformly moistened, the electric field distribution on the surface is almost consistent with which when the surface of the bushing is completely dry, so the flashover problem caused by non-uniform electric field distribution when the surface of the bushing is non-uniformly moistened can be effectively settled. The device consists of a uniform rain net and a uniform rain net support. The side length of each mesh of the uniform rain net shall not be less than 30mm, and the water drop on the surface of the net in the state of slanting raining shall be ensured to drop vertically on the surface of the bushing. The net adopts stainless steel or high strength insulation material. The mounting height of the net shall be detailedly calculated, and relevant experiments shall be carried out when necessary to ensure the minimum distance between the net, the support and the bushing end meet the requirement of safe air distance and avoid electric power generation. When the installation is completed, experiment with the net using artificial rainfall shall be conducted to ensure that the surface of the bushing can be uniformly moistened. The operating principle of the uniform moistening on the bushing shall refer to an attached drawing in the abstract.

Description

technical field [0001] The invention belongs to the field of high-voltage direct current transmission, and relates to a device for preventing non-uniform rain flashing of a high-voltage direct current through wall bushing. Background technique [0002] HVDC wall bushing is one of the most critical equipment in HVDC transmission projects, and it undertakes the function of leading the high-voltage DC in the indoor valve hall or indoor DC field to the outdoors. Therefore, the middle part is fixed on the wall through the grounding flange, grounded together with the wall, and a conductive copper rod or aluminum rod is used to connect the high-voltage lead wire indoors and outdoors in the middle. The detailed structure of the high-voltage wall bushing is shown in attached drawings 3, 4, and 5. The high-voltage shielding covers at both ends of the bushing are the high-voltage shields of the bushing, and the middle part is a grounding flange, which is used for mounting on the wall. ...

AI Technical Summary

Problems solved by technology

Although water spraying devices were installed in the early converter stations, as the voltage of the bushings increased, it became more and more difficult to install equipment near it, and the maintenance of the equipment was also very difficult, which also had a greater impact on the water quality of the spraying water. high demands

And the cost is high, when the water pump fails, the safe operation of the bushing in rainy days cannot be guaranteed

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