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Design method of DC transmission converter transformer grid-side casing

A technology of direct current transmission and design method, which is applied in the direction of circuits, electrical components, insulators, etc., and can solve problems such as tail insulation distance, insulation thickness, insulation margin, field strength design, mechanical size design, airtightness and other design parameters defects , to achieve the effect of improving the reliability of power transmission and ensuring safe operation

Active Publication Date: 2015-06-24
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Combined with the three accidents of the same type of bushings of the company that occurred in Xingren Converter Station, Zhaoqing Converter Station, and Anshun Substation, the research on the cause of the failure of the high-voltage bushing on the side of the converter transformer network was carried out; the research results show that the company’s bushings The tube has defects in design parameters such as tail insulation distance, insulation thickness, insulation margin, field strength design, mechanical size design, airtightness, etc.

Method used

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  • Design method of DC transmission converter transformer grid-side casing
  • Design method of DC transmission converter transformer grid-side casing
  • Design method of DC transmission converter transformer grid-side casing

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Embodiment

[0037] Please refer to figure 1 , the present embodiment illustrates the steps of the design method through specific examples as follows:

[0038] S1, the height L of the porcelain bushing on the bushing 1 OK for:

[0039] Based on the one-minute withstand voltage value of the rheological bushing at power frequency U 1 = 630kV, the average dry flash field strength E of the bushing in the air 1 =2.6kV / cm, to ensure a certain margin parameter A of the bushing 1 =25%, use formula (1) to determine the height L of the porcelain sleeve on the sleeve 1 is 303cm (the calculation process is shown in formula (9)).

[0040] 303=630*(1+0.25) / 2.6 (9)

[0041] S2. Determination of the length of each equalizing plate in the casing core, which includes the following steps:

[0042] S21. Determination of the withstand voltage of the insulating layer between adjacent plates: combined with the number of layers of the insulating layer of the bushing n=120, the highest working phase voltage...

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Abstract

The invention discloses a design method of a DC transmission converter transformer grid-side casing. The method comprises the following steps of: A. determination of a height L1 of an insulator on the casing; B. determination of a length of each voltage-sharing pole plate in a casing core; and C. determination of inner and outer voltage-sharing pole radius in the casing core. The invention improves performances of the converter transformer grid-side casing in terms of the tail insulation distance, insulation thickness, insulation margin, field intensity design, mechanical dimension design, leakproofness and the like. The casing of the type with high reliability can be used as a spare of a converter transformer grid-side high-voltage casing to ensure safe operation of the converter transformer casing device and to improve the transmission reliability of the DC system.

Description

technical field [0001] The invention relates to the field of fault bushings on the side of a direct current transmission converter transformer network, in particular to a bushing design method for the feasibility of replacement of a faulty bushing on the side of a direct current power transmission converter transformer network. Background technique [0002] China Southern Power Grid Corporation has built four DC transmission lines of ±500kV Tianguang DC, Gaozhao DC, Xing'an DC, and ±800kV Yunguang UHVDC transmission lines. All of them are 500kV, and a total of 112 converter transformer grid side high-voltage terminals adopt AC 500kV OTF1800-550-BE6B high-voltage capacitor bushings produced by HSP HOCHSPANNUGSGER TE PORZ GMBH (hereinafter referred to as HSP). In Guiguang I circuit and Guiguang II circuit two DC transmission lines, the bushings used in each converter are oil-paper capacitive bushings manufactured by German HSP company. On the DC lines under the ultra-high vol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B19/00
Inventor 邓军夏谷林张长虹楚金伟周尚礼黎卫国龙启卢文浩
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID