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Live maintenance technology of ±500kv double-circuit DC transmission line on the same tower

A DC transmission line, live maintenance technology, applied in the direction of overhead lines/cable equipment, etc., can solve the problem of not being able to meet the needs of ±500kV dual-circuit DC line maintenance on the same tower

Active Publication Date: 2017-03-15
STATE GRID CORP OF CHINA +1
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  • Application Information

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Problems solved by technology

Therefore, the traditional operation method cannot meet the needs of ±500kV dual-circuit DC line maintenance on the same tower

Method used

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  • Live maintenance technology of ±500kv double-circuit DC transmission line on the same tower
  • Live maintenance technology of ±500kv double-circuit DC transmission line on the same tower
  • Live maintenance technology of ±500kv double-circuit DC transmission line on the same tower

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Embodiment Construction

[0026] For a better understanding of the present invention, the invention will be described in detail below with reference to the accompanying drawings and specific examples.

[0027] Before the detailed introduction of the technical solution of the present invention, the theoretical basis of the project research is briefly stated:

[0028] (1) The pole-to-tower structure, insulator string type, hardware connection form, conductor grounding wire arrangement, line mechanical load level and air gap form of the ±500kV DC double-circuit line on the same tower provided by the Central South Electric Power Design Institute and other design units;

[0029] (2) According to the analysis and calculation of the overvoltage level of the ±500kV double-circuit DC transmission line on the same tower by the State Grid Electric Power Research Institute and the research on the live working gap test of the ±500kV double-circuit DC line on the same tower, the proposed ultra-high voltage double-cir...

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Abstract

A live overhaul process for a ± 500 kV double-loop DC power transmission line on the same tower. An operation method of entering equal potential comprises the steps of: after an equal potential worker and an earth potential worker carry insulated transmission ropes and climb to an earth wire peak and fasten safety belts, installing, by the equal potential worker and the earth potential worker, an insulated pulley and the insulated transmission ropes on the earth wire peak; transmitting, by a ground worker, an insulated flexible ladder and a hanging head of the insulated flexible ladder to the position of the earth potential worker; dismantling, by the earth potential worker, a damper of a working-side overhead earth wire, and reliably installing the hanging head of the insulated flexible ladder on the overhead earth wire; after checking the connection of various parts of screening clothing, the equal potential worker fastening an insulated protection rope, climbing to the insulated flexible ladder and fastening the safety belt to the insulated flexible ladder; and swinging, by the ground worker, the insulated flexible ladder using a tail rope of the insulated flexible ladder, and quickly reaching out for the wire to carry out potential transfer when the equal potential worker is about 0.5 m away from a live wire. The live overhaul process can improve the efficiency of line repairs.

Description

[0001] 【Technical field】 [0002] The invention relates to the field of ultra-high voltage power transmission and transformation, in particular to a live maintenance process for a ±500kV double-circuit direct current transmission line on the same tower. [0003] 【Background technique】 [0004] The operation, maintenance and overhaul of transmission lines is an important means to master the operation of the power grid, to discover and deal with equipment defects in time, and it is also the basic work to ensure the safe and stable operation of the lines. Since the ultra-high voltage grid plays a central role in the operation of the entire national grid, the operation and maintenance of the ultra-high voltage grid is of great significance to ensure the safe, stable and reliable operation of the ultra-high voltage grid and even the entire national grid. [0005] The comprehensive transformation of Ge-Shanghai HVDC, that is, the ±500kV Genan Line (Linfeng Line) double-circuit DC tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02G1/02
CPCH02G1/02
Inventor 余雷刘越汤正汉向文祥刘继承王星超
Owner STATE GRID CORP OF CHINA
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