A large-capacity zinc oxide arrester
A zinc oxide and surge arrester technology, applied in the field of surge arresters, can solve the problems of inability to guarantee the safe operation of the line, decrease in the thermal stability of the surge arrester, affecting the reliability of the power supply, etc., and achieve the effects of excellent protection characteristics, good sealing, and slow product aging.
Active Publication Date: 2018-08-03
STATE GRID CORP OF CHINA +2
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Problems solved by technology
Common line-type surge arresters are used for lightning protection in multiple minefields and strong minefields. Frequent induced lightning overvoltages will cause frequent actions of line arresters, which will cause thermal stability decline, heat accumulation, leakage current increase, and valve plate deterioration. Breakdown of the insulating seal, resulting in breakdown
Once the arrester breaks down, it will bring unclear fault points to the line, which is difficult to troubleshoot in the shortest time, seriously affecting the reliability of power supply
Therefore, in some minefields and strong minefields, even after the lightning protection device is installed, the lightning protection effect is not obvious, and lightning strike disconnection, lightning tripping, and lightning protection device explosion incidents still occur from time to time
[0003] According to the national standard GB 11032-2010 "AC gapless metal zinc oxide arrester" standard, the nominal discharge current of the arrester should generally be carried out in accordance with 5KA, so that the safe operation of the line cannot be guaranteed for special areas
Method used
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[0018] In order to have a further understanding and understanding of the structural features of the present invention and the achieved effects, the preferred embodiments and accompanying drawings are used for a detailed description, as follows:
[0019] Such as figure 1 As shown, a large-capacity zinc oxide arrester according to the present invention includes an umbrella cover body 1, which is a traditional umbrella cover structure, with an umbrella group outside and a core 2 installed inside. Similarly, an upper insulating end cap 7 is installed on one end of the umbrella cover body 1 located at the positive electrode 3 , and a lower insulating end cap 8 is installed on the other end located at the negative electrode 4 .
[0020] The core body 2 includes a positive electrode 3, a negative electrode 4, an upper resistive sheet 5 and a lower resistive sheet 6, and the number of the upper resistive sheet 5 and the lower resistive sheet 6 is plural. The positive electrode 3 , th...
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The invention relates to a large-capacity zinc oxide lightning arrester, and solves the defect that a large-capacity zinc oxide lightning arrester is not available compared with the prior art. A core body comprises a positive electrode, a negative electrode, upper resistor sheets and lower resistor sheets; a plurality of upper resistor sheets and a plurality of lower resistor sheets are provided; the positive electrode, the upper resistor sheets, the lower resistor sheets and the negative electrode are overlapped in series successively, the height of the upper resistor sheets is higher than that of the lower resistor sheets, and the diameter of the upper resistor sheets and the diameter of the lower resistor sheets are both 50 mm-60 mm. Under a same voltage class performance condition, the large-capacity zinc oxide lightning arrester has higher reliability, longer service life and slower product aging degree than 5 kA lightning arresters.
Description
technical field [0001] The invention relates to the technical field of lightning arresters, in particular to a large-capacity zinc oxide lightning arrester. Background technique [0002] Since the use of 10kV insulated overhead conductors, the problems of lightning disconnection and lightning tripping of insulated conductors have been plagued by distribution network operators. According to the survey, most of the overvoltages directly affecting the distribution lines are induced lightning overvoltages. Common line-type surge arresters are used for lightning protection in multiple minefields and strong minefields. Frequent induced lightning overvoltages will cause frequent actions of line arresters, which will cause thermal stability decline, heat accumulation, leakage current increase, and valve plate deterioration. The insulating seal is broken, resulting in breakdown. Once the lightning arrester breaks down, it will bring unclear fault points to the line, which is diffic...
Claims
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IPC IPC(8): H01C7/12
CPCH01C7/126
Inventor 冯玉吴少雷杨孝志裴倩赵成骆晨王明刘清张建怀江阳张弛
Owner STATE GRID CORP OF CHINA