CN101383209A - Ultra-high voltage can type lightning arrestor without parallel voltage equalizing capacitor - Google Patents
Ultra-high voltage can type lightning arrestor without parallel voltage equalizing capacitor Download PDFInfo
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- CN101383209A CN101383209A CNA2008102250557A CN200810225055A CN101383209A CN 101383209 A CN101383209 A CN 101383209A CN A2008102250557 A CNA2008102250557 A CN A2008102250557A CN 200810225055 A CN200810225055 A CN 200810225055A CN 101383209 A CN101383209 A CN 101383209A
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- lightning arrester
- core body
- valve block
- arrestor
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Abstract
The invention relates to an extra-high voltage can-type arrestor without a parallel equalizing capacitor, which belongs to the technical field of an electrical device. The arrestor comprises an arrestor can body, valve plates, a valve plate core rod, an equalizing cover, fixing flanges, and the like, wherein the valve plates are folded on the valve plate core rod in series to form valve plate posts, both ends of the four valve plate posts are respectively fixed on the two fixing flanges to form a valve plate core body section, an arrestor core body is formed by connecting a plurality of valve plate core body sections in series and is arranged on a center line of the arrestor can body, one end of the arrestor core body is correspondingly fixed to the arrestor can body by the fixing flanges, the middle of the arrestor core body is correspondingly fixed to the arrestor can body by a radial insulation bracket, and the other end of the arrestor core body extends into the equalizing cover and is fixed at the bottom of the equalizing cover by the fixing flanges. The arrestor ensures that the potential distribution nonuniformity of the whole arrestor is less than 15 percent, simplifies the structure of an extra-high voltage GIS can-type arrestor, and reduces the product cost.
Description
Technical field
The present invention relates to a kind of ultra high voltage pot type lightning arrester that does not have parallel equalizing capacitor, relate in particular to a kind of pot type lightning arrester of high pressure sulfur hexafluoride pot type structure (hereinafter to be referred as GIS) of new no parallel equalizing capacitor, belong to the electrical equipment technical field.
Background technology
Zinc oxide arrester is the Primary Component of Hyper-Voltage of Power Systems protection, and the overvoltage protection level of lightning arrester is the basic decisive factor of electric power system various device insulation level.Concerning system for ultra-high voltage transmission, because the system voltage grade is very high, volume and cost and reliability of operation thereof that relevant device is made depend on the insulation level of system to a great extent; And the basis that system insulation cooperates is system's overvoltage level under various conditions, and it is to determine by the protectiveness the subject of knowledge and the object of knowledge of the used lightning arrester of system for ultra-high voltage transmission is direct.
In order to develop the ultra high voltage lightning arrester of excellent performance, need to solve the many key technical problems that wherein relate to, comprise high performance zinc oxide varistor (being called for short zinc oxide valve plate, valve block), multicolumn valve block CURRENT DISTRIBUTION in parallel uniformity, whole Potential distribution uniformity, structural design, insulation property, experimental technique or the like.Wherein, the uneven situation of the whole Potential distribution of zinc oxide arrester can cause the zinc oxide valve plate of close high-pressure side in the lightning arrester need bear bigger continuous operating voltage, chargeability under the valve block running status is higher, easier generation aged deterioration, thus the functional reliability and the useful life of whole lightning arrester influenced.For this reason, the Potential distribution nonuniformity coefficient of correlation technique standard-required zinc oxide arrester integral body is no more than 15%.
At present, extra-high-voltage alternating current transformer station mainly adopts GIS, so lightning arrester is also based on GIS pot type lightning arrester.For extra-high voltage GIS pot type lightning arrester, owing to need to bear very high continuous operating voltage between the lightning arrester two end electrodes, and zinc oxide valve plate core body portion size is very elongated in the lightning arrester, so the problem of the whole inhomogeneity of electric potential distribution of lightning arrester is just particularly outstanding and serious.For the problem of the whole inhomogeneity of electric potential distribution of lightning arrester, traditional improvement measure is to adopt the grading ring cover, and parallel equalizing capacitor.Adopt the measure of grading ring cover, ring covers size and all presses effect to be subjected to the restriction of extra-high voltage GIS pot type lightning arrester overall structure size; And the measure of parallel equalizing capacitor, not only greatly increased the difficulty of the extra-high voltage GIS pot type lightning arrester overall construction design and the manufacturing, and, will become the inherent weak link and the potential safety hazard that influence the stable operation of extra-high voltage GIS pot type lightning arrester long-term safety owing to the long-term voltage endurance of shunt capacitance can't effectively ensure.
Summary of the invention
The objective of the invention is to propose a kind of ultra high voltage pot type lightning arrester that does not have parallel equalizing capacitor, be no more than at the whole Potential distribution nonuniformity coefficient of lightning arrester under 15% the prerequisite, simplify the structural design of extra-high voltage GIS pot type lightning arrester effectively, improve the security reliability of lightning arrester inherence simultaneously.
The ultra high voltage pot type lightning arrester of the no parallel equalizing capacitor that the present invention proposes, comprise lightning arrester tank body, valve block, valve block plug, grading shield, mounting flange, radial insulation support and axial dielectric support, described valve block string is stacked on the valve block plug, form the valve block post, the two ends of four valve block posts are separately fixed on two mounting flanges, form a joint valve block core body, the series connection of more piece valve block core body constitutes lightning arrester core body; Described lightning arrester tank body is horizontal columnar structured, lightning arrester core body places on the center line of lightning arrester tank body, one end of lightning arrester core body is by mounting flange and lightning arrester tank body relative fixed, the middle part of lightning arrester core body is by radial insulation support and lightning arrester tank body relative fixed, the other end of lightning arrester core body stretches in the grading shield, and is fixed on the bottom of grading shield by mounting flange; Grading shield is by axial dielectric support and lightning arrester tank body relative fixed, and the top of grading shield is a grading ring, grading shield and the coaxial installation of lightning arrester core body.
In the above-mentioned lightning arrester, diameter Da=1.8～2 of lightning arrester tank body meter.
In the above-mentioned lightning arrester, the external diameter of grading shield is Dv=900～1000 millimeter, the length Hv=1500 of grading shield～1800 millimeter.
In the above-mentioned lightning arrester, the outer diameter D z=136 of valve block～140 millimeter, inner diameter d z=54～60 millimeter, thickness Hz=20～30 millimeter.
The ultra high voltage pot type lightning arrester of the no parallel equalizing capacitor that the present invention proposes, its advantage is:
1, the lightning arrester of the present invention's proposition, can so that the inhomogeneity of electric potential distribution of lightning arrester integral body less than 15%, therefore no longer need to adopt the ancillary method of parallel equalizing capacitor, thereby effective simplification the structure of extra-high voltage GIS pot type lightning arrester, reduce the manufacturing difficulty and the cost of lightning arrester, improved the security reliability of lightning arrester inherence simultaneously.
2, the extra-high voltage GIS pot type lightning arrester of the present invention's proposition, adopted the zinc oxide varistor valve of high-voltage gradient, make the volume and weight of lightning arrester integral body compared with the prior art greatly reduce, reach about half that use conventional oxidation zinc varistor valve, thereby further simplified the structure of extra-high voltage GIS pot type lightning arrester, reduced product cost.
Therefore lightning arrester of the present invention has good society and economic benefit.
Description of drawings
Fig. 1 is the structural representation of the ultra high voltage pot type lightning arrester that proposes of the present invention.
Fig. 2 is A-A cutaway view of Fig. 1.
Fig. 3 is the schematic diagram of lightning arrester middle valve plate.
Fig. 1---among Fig. 3, the 1st, lightning arrester tank body, the 2nd, grading shield, the 3rd, grading ring, the 4th, radial insulation support, the 5th, mounting flange, the 6th, valve block, the 7th, valve block plug, the 8th, axial dielectric support.
Embodiment
The ultra high voltage pot type lightning arrester of the no parallel equalizing capacitor that the present invention proposes, its structure comprises lightning arrester tank body 1, valve block 6, valve block plug 7, grading shield 2, mounting flange 5, radial insulation support 4 and axial dielectric support 8 as shown in Figure 1.Valve block 6 strings are stacked on the valve block plug 7, form the valve block post, and the two ends of four valve block posts are separately fixed on two mounting flanges 5, form a joint valve block core body, and the series connection of more piece valve block core body constitutes lightning arrester core body, and its cross section as shown in Figure 2.Lightning arrester tank body 1 is horizontal columnar structured, lightning arrester core body places on the center line of lightning arrester tank body 1, one end of lightning arrester core body is by mounting flange 5 and lightning arrester tank body 1 relative fixed, the middle part of lightning arrester core body is by radial insulation support 4 and lightning arrester tank body 1 relative fixed, the other end of lightning arrester core body stretches in the grading shield 2, and is fixed on the bottom of grading shield 2 by mounting flange 5.Grading shield is by axial dielectric support 8 and lightning arrester tank body 1 relative fixed, and the top of grading shield 2 is a grading ring 3, grading shield 2 and the coaxial installation of lightning arrester core body.
In the lightning arrester of the present invention, the diameter Da of lightning arrester tank body 1 can be 1.8～2 meters.The external diameter of grading shield can be Dv=900～1000 millimeter, the length Hv=1500 of grading shield～1800 millimeter.
In the lightning arrester of the present invention, the structure of valve block as shown in Figure 3, the outer diameter D z=136 of valve block～140 millimeter, inner diameter d z=54～60 millimeter, thickness Hz=20～30 millimeter.The pressure sensitive voltage gradient Ez=370～426V/mm of valve block, the square wave ability absorbs density Pz=250J/cm
3More than.
In the lightning arrester tank body of the present invention, be filled with sulphur hexafluoride (SF
6) gas, have good insulation performance and antifouling property; Radial and axial insulating support plays the effect of supporting the zinc oxide valve plate core body.
In one embodiment of the present of invention, lightning arrester core body is in series by 4 joint valve block core bodys.From Fig. 2 axle as can be seen, every joint valve block core body is made of 4 valve block posts again, and each valve block post is made of 11700 zinc oxide varistor valve series connection; Series connection zinc oxide varistor valve post adopts the valve block plug 7 that penetrates its endoporus to fix, and the adjacent zinc oxide valve plate core body of two joints is connected and fixed by mounting flange 5.
The applicant's correlative study achievement shows: the overall length that reduces series connection zinc oxide valve plate core body in the lightning arrester can effectively be improved the uniformity of the whole Potential distribution of lightning arrester; The zinc oxide valve plate of employing high-voltage gradient can effectively reduce the overall length of series connection zinc oxide valve plate core body in the lightning arrester.Further studies show that: the overall length of series connection zinc oxide valve plate core body is not only closely related with the voltage gradient performance of valve block in the lightning arrester, but also is limited by the basic demand of ultra high voltage lightning arrester insulation spacing; And the voltage gradient performance of zinc oxide varistor valve also is limited by the basic demand of ultra high voltage lightning arrester discharge capacity.
Below be one embodiment of the present of invention,
Lightning arrester tank body overcoat adopts horizontal columnar structured, diameter Da=1.8m, in be filled with sulphur hexafluoride (SF
6) gas.
The outer diameter D z=136mm of zinc oxide varistor valve, inner diameter d z=54mm, thickness Hz=20mm.Valve block pressure sensitive voltage gradient Ez=370V/mm, the square wave ability absorbs density Pz=250J/cm
3
Lightning arrester core body has 4 joints, and every joint core body is divided into 4 posts again, and every post is made of 38 zinc oxide varistor valve series connection; Series connection zinc oxide varistor valve post adopts the expoxy glass steel core bar that penetrates its endoporus to fix, and two joint zinc oxide valve plate core bodys are connected and fixed by flange section.
The external diameter of the grading shield of lightning arrester is got Dv=960mm, and cover is gone into the degree of depth and got Hv=1600mm.
Adopt the extra-high voltage GIS pot type lightning arrester of technique scheme, under the condition of no parallel equalizing capacitor, the maximum withstand voltage deviation that single valve block bears in the lightning arrester is 13.83%, can satisfy the requirement of correlation technique standard.
Claims (4)
1, a kind of ultra high voltage pot type lightning arrester that does not have parallel equalizing capacitor, it is characterized in that this lightning arrester comprises lightning arrester tank body, valve block, valve block plug, grading shield, mounting flange, radial insulation support and axial dielectric support, described valve block string is stacked on the valve block plug, form the valve block post, the two ends of four valve block posts are separately fixed on two mounting flanges, form a joint valve block core body, the series connection of more piece valve block core body constitutes lightning arrester core body; Described lightning arrester tank body is horizontal columnar structured, lightning arrester core body places on the center line of lightning arrester tank body, one end of lightning arrester core body is by mounting flange and lightning arrester tank body relative fixed, the middle part of lightning arrester core body is by radial insulation support and lightning arrester tank body relative fixed, the other end of lightning arrester core body stretches in the grading shield, and is fixed on the bottom of grading shield by mounting flange; Grading shield is by axial dielectric support and lightning arrester tank body relative fixed, and the top of grading shield is a grading ring, grading shield and the coaxial installation of lightning arrester core body.
2, lightning arrester as claimed in claim 1 is characterized in that diameter Da=1.8～2 meter of wherein said lightning arrester tank body.
3, lightning arrester as claimed in claim 1, the external diameter that it is characterized in that wherein said grading shield are Dv=900～1000 millimeter, the length Hv=1500 of grading shield～1800 millimeter.
4, lightning arrester as claimed in claim 1 is characterized in that outer diameter D z=136～140 millimeter of wherein said valve block, inner diameter d z=54～60 millimeter, thickness Hz=20～30 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102250557A CN101383209A (en) | 2008-10-27 | 2008-10-27 | Ultra-high voltage can type lightning arrestor without parallel voltage equalizing capacitor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102250557A CN101383209A (en) | 2008-10-27 | 2008-10-27 | Ultra-high voltage can type lightning arrestor without parallel voltage equalizing capacitor |
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| Publication Number | Publication Date |
|---|---|
| CN101383209A true CN101383209A (en) | 2009-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008102250557A Pending CN101383209A (en) | 2008-10-27 | 2008-10-27 | Ultra-high voltage can type lightning arrestor without parallel voltage equalizing capacitor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102176363A (en) * | 2011-02-22 | 2011-09-07 | 中国西电电气股份有限公司 | Voltage equalizing structure for extra-high-voltage arrester |
| CN109448942A (en) * | 2018-12-13 | 2019-03-08 | 合肥金瑞配网电气设备有限公司 | A kind of arrester of monitoring interface with voltage |
-
2008
- 2008-10-27 CN CNA2008102250557A patent/CN101383209A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102176363A (en) * | 2011-02-22 | 2011-09-07 | 中国西电电气股份有限公司 | Voltage equalizing structure for extra-high-voltage arrester |
| CN102176363B (en) * | 2011-02-22 | 2012-11-21 | 中国西电电气股份有限公司 | Voltage equalizing structure for extra-high-voltage arrester |
| CN109448942A (en) * | 2018-12-13 | 2019-03-08 | 合肥金瑞配网电气设备有限公司 | A kind of arrester of monitoring interface with voltage |
| CN109448942B (en) * | 2018-12-13 | 2024-03-12 | 合肥金瑞配网电气设备有限公司 | Lightning arrester with voltage monitoring interface |
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Open date: 20090311 |