High-voltage direct-current polar PLC capacitor
A capacitor and high-voltage technology, which is applied in the field of high-voltage DC polar line PLC capacitors and filter capacitors, can solve the problems of difficult to meet the mechanical strength requirements of capacitor porcelain sleeves, high cost of special porcelain sleeves, and difficult to solve stability, and achieve mechanical Reduced strength requirements, reduced costs, and improved stability
Active Publication Date: 2010-04-14
GUILIN POWER CAPACITOR
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Problems solved by technology
At present, the stability of single-column capacitors with a height of more than 15 meters is difficult to solve. Even if the current high-strength porcelain is used, it is difficult to meet the mechanical strength requirements of such a tall capacitor porcelain sleeve. On the other hand, the cost of special porcelain sleeves is extremely high. High voltage The price of DC PLC capacitors is as high as 10 million yuan
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[0023] The implementation of this high voltage DC pole line PLC capacitor is as follows Figure 1 to Figure 4 As shown, it includes vertically stacked capacitor units 3, and the core 3-1 formed by connecting the capacitor elements is located in the porcelain casing 3-3 and immersed in the insulating impregnating agent to form the capacitor unit 3, and the capacitor unit 3 is equipped with a voltage equalizer Component distributed voltage equalizing resistors 3-2; 11-layer capacitor units 3 are stacked vertically to form capacitor columns, the upper end leads to high-voltage terminal 7, the lower end leads to low-voltage terminal 6, and two 11-layer post insulators 2 are vertically stacked Insulator post, the diameter of the post insulator used is 0.5 times the diameter of the capacitor unit. The height of each layer of the three columns is the same, and the total height is also the same. The bottom ends of the three columns are fixed on the base frame 5 made of channel steel, ...
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The invention relates to a high-voltage direct-current polar PLC capacitor which comprises a capacitor column formed by vertically stacking 7-30 layers of capacitor units and 2 insulator columns with the same layer and height with the capacitor column, or 2 capacitor columns, or an insulator column and a capacitor column, wherein a high-voltage connecting terminal and a low-voltage connecting terminal are respectively led from the upper end and the lower end of the capacitor column; the bottom ends of the three columns are fixed on a base bracket, the central connecting lines of the three columns on the same plane form a triangle, each side length of the triangle is 2-10 times as long as the diameter of the capacitor unit, the angles of the triangle are 30-90 degrees, and the optimum is an equilateral triangle. Three capacitor units and / or post insulators are arranged in and connected with each layer or at interval of 1-3 layers so that the three columns form a whole body, therefore, the stability is improved. Grading rings are arranged in each layer or at interval of 1-3 layers at the top layer of the high-voltage end of the capacitor column and within 20 layers near the high-voltage end so that the corona generation is reduced. The capacitor greatly reduces the requirement to the mechanical strength of porcelain bushings of the capacitor units, reduces the cost by 10 times, improves the capacitor stability and is convenient to install.
Description
(1) Technical field [0001] The invention relates to the field of high-voltage direct-current transmission, in particular to a high-voltage direct-current pole line PLC capacitor used in a high-voltage direct-current transmission system, that is, a filter capacitor for filtering out harmonic components with a frequency of 30 kHz to 300 kHz on the direct-current side of a converter transformer. (2) Background technology [0002] Most of my country's power resources (hydropower, coal power) are concentrated in the economically underdeveloped western regions, while the economically developed southeast coastal areas lack power resources, coupled with my country's vast territory, this determines that my country's power energy needs long distances Large-capacity power transmission - west to east power transmission. [0003] At present, the latest high-end technology for long-distance large-capacity power transmission in the world is ultra-high voltage direct current transmission (HV...
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IPC IPC(8): H02M1/12
Inventor 左强林黄有祥王增文梁琮廖斌莫华明龙玉保雷琼艳李小燕
Owner GUILIN POWER CAPACITOR
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