Method for live replacement of +/-500kV DC line strain tower insulator string

A technology of insulator strings and live replacement, which is applied in the direction of overhead lines/cable equipment, etc., can solve problems such as difficult to ensure safe and stable operation of lines, and achieve the effects of reducing manpower loss, high work efficiency, and improving reliability

Active Publication Date: 2016-07-06
EXTRA HIGH VOLTAGE POWER TRANSMISSION NANJING OF CHINA SOUTHERN POWER GRID
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

But at present, there is no way to complete the operation process of "taking out the whole string of ceramic insulators and placing them on the ground by electrification", which makes it difficult to ensure the safe and stable operation of the line

Method used

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  • Method for live replacement of +/-500kV DC line strain tower insulator string
  • Method for live replacement of +/-500kV DC line strain tower insulator string

Examples

Experimental program
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Embodiment Construction

[0026] The method of replacing the ±500kV DC line strain tower insulator string 6 with power on, such as Figure 1-2 shown, including the following steps:

[0027] 1) Equipment preparation: prepare the first transmission rope 10, the second transmission rope 11, safety belt, overhead ground wire block 23, insulating ladder 7, first insulating flexible rope 8, second insulating flexible rope 9, tower head end Special fixture 16, hydraulic screw mandrel 17, lead end special fixture 20, labor-saving screw mandrel 19, insulating suspender 18, the first traction rope 12, the first turning tackle, the second turning tackle, the second traction rope 13, the first pulling rope Three steering blocks and motorized winch 15; wherein the first transmission rope 10, the second transmission rope 11, the first traction rope 12, and the second traction rope 13 are all insulating materials;

[0028] 2) The first electrician 1, the second electrician 2, and the third electrician 3 go up the to...

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Abstract

The invention discloses a method for live replacement of a +/-500kV DC line strain tower insulator string. A third electrician is conveyed to a wire terminal from a tower by cooperation of an insulated flexible ladder and an overhead ground wire pulley; a ground potential is transferred to an equipotential; and meanwhile, tools required for operation are carried, so that the operation process of 'taking out the whole ceramic insulator string to put on the ground in a live manner' can be quickly finished; a guarantee is provided for safe and stable operation of the line; and the process is safe, reliable, time-saving and labor-saving.

Description

technical field [0001] The present invention mainly relates to the technical field of insulator string replacement, in particular to the technical field of live replacement of ±500kV DC line tension tower insulator string operation method. Background technique [0002] When it is found that the insulation resistance of a string of ceramic insulators on the ±500kV Xing’an DC line does not meet the requirements, it is necessary to promptly take a power outage and use a megohmmeter to test the insulators one by one, find out the unqualified insulators and replace them. Due to the large line load, unplanned outages are not allowed, so the whole string of ceramic insulators must be taken out and placed on the ground by live charging for testing. But at present, there is no way to complete the operation process of "taking out the whole string of ceramic insulators and placing them on the ground by electrification", which makes it difficult to ensure the safe and stable operation o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02G1/02
CPCH02G1/02
Inventor 吴正树李昌甫陆文叁方苏樊长海刘宝龙黄荣海黄集贤杨耀祖陈鹏康潘有志韦海效方刚
Owner EXTRA HIGH VOLTAGE POWER TRANSMISSION NANJING OF CHINA SOUTHERN POWER GRID
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