DC bipolar half voltage overload ice melting method

A method of melting ice and a technology of melting ice, applied to the installation of DC network circuit devices, electrical components, cables, etc., can solve the problems of threatening the safe operation of the power system, danger, and low efficiency
CN101364720AInactive Publication Date: 2009-02-11国网直流工程建设有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
国网直流工程建设有限公司
Publication Date
2009-02-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for deicing a DC line which runs under the double-pole semi-pressure overload in the established DC power transmission system. At present, the DC voltage class is plus or minus 500 kV in the established DC power transmission system in China. When the external insulation level of the line is reduced due to the ice-coated DC line, flashover and other failures occur if the line still runs at a normal voltage for the time being, and finally result in abnormal running of the DC system. Through the appropriate change of the wiring manner inside the valve hall of the established DC power transmission system, and the adoption of DC running voltage of plus or minus 250kV obtained by reducing half of the original DC running voltage, and the possibility of the insulation flashover in the DC system is greatly reduced and the line can run under the overload, so that the method is realized. The method has the advantages that no main device is added, the insulation level of the prior device is not required to improve, and the wiring manner inside the valve hall is only required to appropriately change, therefore the method has higher use value.
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Description

technical field

[0001] The invention relates to a method for melting ice of a direct current line of a high-voltage direct current transmission system. More specifically, the method is especially suitable for melting ice of a direct current line of a direct current transmission system that has been put into operation. In this method, a 6-pulse converter in pole one and a 6-pulse converter in pole two are connected by appropriately changing the wiring mode in the valve hall without adding any main equipment and without improving the insulation level of the equipment. The converters are connected in series to form a new 12-pulse converter, which adopts a DC operating voltage of ±250kV, which is reduced by half compared with the original one. During overload operation, it can provide DC current to melt ice on DC ice-coated lines. Background technique

[0002] China is one of the countries with the most severe icing on transmission lines in the world. Severe icing will lead to ...

Claims

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