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

Inactive Publication Date: 2009-02-11
国网直流工程建设有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Icing accidents have seriously threatened the safe operation of my country's power system and caused huge economic losses
[0003] The traditional manual tower deicing method is not only dangerous, but also inefficient, it is a last resort remedy

Method used

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Embodiment Construction

[0009] For the built ±500kV DC power transmission project, the sending-end system and the receiving-end system are composed of two poles, respectively called pole one and pole two, as figure 1 As shown, pole 1 and pole 2 are composed of two 6-pulse converters connected in series to form a 12-pulse converter, and the two 6-pulse converters are respectively connected with star (Y / Y) converter transformer and angular (Y / D) converter transformer phase connection. Under normal circumstances, pole one operates at +500kV, pole two operates at -500kV, and each 6-pulse converter contributes 250kV to the DC voltage. In the case of icing on the DC line, when the insulation of the line is reduced, the voltage of pole 1 and pole 2 can only be reduced to 70% of the rated voltage for operation. As mentioned above, due to the stress of the converter valve, the current of the DC line is the largest at this time. It can only be the rated current, which cannot meet the requirements for melting ...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02G7/16H02J1/00
Inventor 石岩张民刘宝宏
Owner 国网直流工程建设有限公司
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