CN105070427A - Cross arm support voltage limiter for overhead line - Google Patents
Cross arm support voltage limiter for overhead line Download PDFInfo
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- CN105070427A CN105070427A CN201510519142.3A CN201510519142A CN105070427A CN 105070427 A CN105070427 A CN 105070427A CN 201510519142 A CN201510519142 A CN 201510519142A CN 105070427 A CN105070427 A CN 105070427A
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Abstract
The invention relates to a cross arm support voltage limiter for an overhead line, belonging to the fields of external insulation and lightning protection of a power distribution and transmission line system. The cross arm support voltage limiter comprises an insulating mandrel (3), two ends of the insulating mandrel (3) are connected with a metal fitting (1) bearing a mechanical force, the outer side of the insulating mandrel (3) is at least provided with one voltage limiting element (5), a serial air gap (4) is formed between the two adjacent voltage limiting elements (5) or between the voltage limiting element (5) and the metal fitting (1), and the insulating mandrel (3) is integrally combined with the voltage limiting element (5) and then wrapped with a compound outer sleeve (2). The cross arm support voltage limiter for the overhead line can achieve the function of a cross-arm insulator in supporting lead wires, can utilize the voltage limiting elements (5) to improve lightning protection level of the line, is a product integrating cross-arm type lead wire support and lightning protection, has fixed discharge serial air gap distance, can be installed and formed in one step, and is simple in structure, convenient to install, small in size, light in weight and low in cost.
Description
Technical field
The present invention relates to a kind of overhead transmission line cross-arm and support voltage limiter, belong to external insulation and the lightning protection field of distribution and line system, be mainly used in solving the lightning-caused breaking in distribution and transmission of electricity and insulator damage problem, effectively can prevent the damage of lightning-caused breaking and insulator.
Background technology
China's distribution and transmission system need a large amount of cross arm insulators to carry out Support Level line conductor, and the lightning withstand level of insulator itself is limited.For the circuit using plain conductor, thunderbolt easily causes insulator arc-over, follow-up power frequency continued flow can cause line tripping, though circuit breaking problem can not be caused, but easily Damage to insulation and really add the trip-out rate of circuit, the lightning protection measures often adopted this is at present zinc oxide surge arresters or portable protective gaps, and use the expansion in face along with insulated conductor, the weakness of insulated conductor self also displays, namely thunderbolt must be broken, for insulated conductor breakage caused by lightning stroke problem, the lightning protection measures taked at present main " leading-type " and " blocking type ", the measure that " leading-type " is conventional is the special gold utensil of installation, power frequency arc root is transferred on special gold utensil and burns, thus guardwire avoids scaling loss, the measure that " blocking type " often adopts is erection lightning conducter, leakage conductor is installed, reduce pole tower ground resistance etc., the power frequency after lightning stroke flashover is stoped to continue arc, fundamentally get rid of the factor of wire scaling loss.And no matter be for plain conductor or insulated conductor, all there is following problem in current lightning protection measures:
1) lightning arrester needs to be installed in parallel on the insulator, and lightning arrester and insulator are Split type structure, and need buy respectively and need to adjust the clearance distance installed, higher to the requirement of installation personnel, buying expenses and maintenance cost are also higher.
2) portable protective gaps can only play and prevent the effect of wire of burning, can not the tripping operation of circuit, needs adjustment assemblage gap distance, requires higher to installation personnel.
3) setting up lightning conducter can only be effective to direct lightning strike, can not prevent induced lightening lightning discharge, but cause circuit lightning discharge mostly be induced lightening, erection lightning conducter can not solve insulator Lightning Flashover of Synthetic.
4) existing porcelain-arm insulator is too heavy, easily cracked and anti-pollution characteristic is poor, and composite sheath can solve problems.
Summary of the invention
According to above deficiency of the prior art, the problem to be solved in the present invention is: provide a kind of structure simple, easy for installation, safe and reliable, the effect of cross arm insulator support wire can be played, the overhead transmission line cross-arm that can improve again line thunder protection level supports voltage limiter, and the cross arm insulator used at present can be replaced to use.
The technical solution adopted for the present invention to solve the technical problems is:
Described overhead transmission line cross-arm supports voltage limiter, comprise insulation mandrel, insulation mandrel two ends are connected with the gold utensil bearing mechanical force, a voltage-limiting element is at least set outside insulation mandrel, adjacent two voltage-limiting element or formed between voltage-limiting element with gold utensil are connected air gap, and insulation mandrel and voltage-limiting element are combined into one rear outside covered composite yarn overcoat.
Described overhead transmission line insulation mandrel one end that cross-arm supports voltage limiter connects gold utensil, upper gold utensil is used for Support Level line conductor, the other end of insulation mandrel connects lower gold utensil, lower gold utensil is for being fixedly mounted on cross-arm, upper gold utensil, lower gold utensil and insulation mandrel are connected as one formation insulation column, the one or both ends of insulation column arrange voltage-limiting element or evenly arrange multiple voltage-limiting element, voltage-limiting element connects upper and lower gold utensil by connecting electrode, discharged by sparking electrode extraction potential, not only can play the effect of cross arm insulator support wire, voltage-limiting element body can also be utilized to improve the lightning protection level of circuit, it is a kind of product integrating cross arm insulator and lightning protection, outside mold pressing composite sheath after insulation column and voltage-limiting element one assembled formation, composite sheath material can adopt silicon rubber cluster parachute or porcelain cluster parachute.The present invention is when making, and electric discharge series connection air gap distance is fixed, can once mounting shaping, easy for installation, compact, lightweight, structure is simple, and cost is low.Insulation mandrel adopts with the gold utensil at two ends and crimps or the bonding or wedge joint, and connected mode can adopt multiple, ensure enough mechanical properties strength, connecting electrode be connected by internal thread with gold utensil, external screw thread connect or other electric connecting mode.Connect flexibly, it is convenient, simple to operate to realize.Upper and lower gold utensil adopts conventional cross arm insulator gold utensil, and the shape of gold utensil is unrestricted, as long as play the effect connecting and support.
Preferred further, voltage-limiting element arranges one or more, and multiple voltage-limiting element adopts the form of 1:1 structure, or adopts the form of other ratio.The design proportion structure of voltage-limiting element is not limit, can be identical, also can be different, when designing at one end, is discharged, form air gap of connecting of discharging by the sparking electrode of upper voltage-limiting element or outer sparking electrode with gold utensil; When designing two or more, discharged by the sparking electrode of adjacent two voltage-limiting element or outer sparking electrode, form electric discharge series connection air gap.
Preferred further, voltage-limiting element is injected into one by connecting electrode, valve block post, sparking electrode and insulating coating or connects into an assembly, valve block post two ends arrange connecting electrode and sparking electrode respectively, insulating coating is socketed outside valve block post, described connecting electrode is for connecting gold utensil, sparking electrode is for forming series connection air gap, and series connection air gap is used for bearing system voltage.When voltage-limiting element arranges one or two, voltage-limiting element is made up of connecting electrode, valve block post, sparking electrode and insulating coating, connecting electrode for connecting gold utensil, the current potential of voltage-limiting element by the sparking electrode of voltage-limiting element or sparking electrode be connected the series connection air gap extraction potential formed between gold utensil and discharge; If when voltage-limiting element arranges three or more, the voltage-limiting element at two ends is made up of connecting electrode, valve block post, sparking electrode and insulating coating, connecting electrode is for connecting the gold utensil at two ends, middle voltage-limiting element is made up of two sparking electrodes, valve block post and insulating coating, two sparking electrodes are separately positioned on the two ends of valve block post, middle voltage-limiting element is directly socketed on insulation mandrel, is discharged by the sparking electrode extraction potential of adjacent two voltage-limiting element.In order to ensure the fail safe in discharge process, at valve block arranged outside insulating coating, in order to ensure fail safe, insulating coating can also arrange anti-explosion groove.
Preferably, voltage-limiting element, insulation mandrel and two ends fitting assembly as a whole after carry out integral die, one-shot forming.
Preferably, sparking electrode is arranged on inside composite sheath, or is exposed to outside composite sheath.Sparking electrode can be wrapped in inside composite sheath completely, also can partial denudation outside composite sheath, also can 360 degree of completely exposed outsides at composite sheath, outer sparking electrode can by the sparking electrode of inside by screw or other connected mode, two sparking electrodes are connected as one, played the effect of extraction potential by outer sparking electrode, sparking electrode and outer sparking electrode to arrange flexibility relatively good, as long as can serve as the effect of extraction potential electric discharge.
Preferably, valve block post is loop configuration, and valve block column sleeve is contained on insulation mandrel.Voltage-limiting element adopts loop configuration, the then annular valve block post of inner employing, annular voltage-limiting element wrap insulate plug, and connect gold utensil by connecting electrode, if voltage-limiting element adopts pie configuration, then inner employing cheese valve block, cheese voltage-limiting element is arranged on the one or both sides of insulation mandrel, connect gold utensil by connecting electrode, sparking electrode extraction potential discharges.The shape of voltage-limiting element is not limit, and can make as required, as long as connecting electrode connects gold utensil, sparking electrode extraction potential discharges, and plays pressure limiting effect.
Preferably, sparking electrode comprises an annulus platform, annulus platform is arranged three intestines shape structural members, and three intestines shape structural members exceed annulus platform 4-50mm, exceed annulus edge of table 2-50mm, and annulus platform and three intestines shape structural members adopt die casting to form;
Preferably, sparking electrode comprises an annulus platform, annulus platform is arranged three ellipsoid beads, form three point of discharges, three ellipsoid beads exceed annulus platform 4-50mm, exceed annulus edge of table 2-50mm, and three ellipsoid beads are welded on annulus platform or with the die casting of annulus platform and form;
Preferably, comprise an annulus platform, annulus platform is arranged three intestines shape structural members, the top of three intestines shape structural members arranges the small embossment containing internal thread, the internal thread diameter of small embossment is 4-40mm, and small embossment is used for the outer sparking electrode that connection is exposed to composite sheath (2) outside;
Preferably, sparking electrode is bolted outer sparking electrode, and outer sparking electrode is by being stamped to form, overall structure is protruding loop configuration, have 3 holes in the middle of bulge loop, the internal diameter of bulge loop is not more than 100mm, is not less than 40mm, the external diameter of bulge loop is not more than 200mm, be not less than 60mm, bulge loop have three projections, porose in projection, bolt is connected by outer sparking electrode with sparking electrode inside composite sheath by the hole in projection, draws discharge potential;
Preferably, sparking electrode connects the outer sparking electrode be made up of pan head screw or hexagonal round head screw;
Preferably, sparking electrode (8) is bolted outer sparking electrode, outer sparking electrode is formed by die casting, overall structure is made up of two parts, two parts form an outer sparking electrode after coordinating, and outer sparking electrode is close to outside composite sheath, outer sparking electrode has three holes, for being connected with the sparking electrode of inside by bolt, draw discharge potential.The internal diameter of outer sparking electrode is not less than 20mm, and external diameter is not more than 500mm.
Preferably, sparking electrode is all arranged at inside composite sheath, and sparking electrode forms discharge channel by puncturing composite sheath; Sparking electrode connects the outer sparking electrode be exposed to outside composite sheath, is discharged by two outer sparking electrodes.
Preferably, outer sparking electrode adopts pan head screw or hexagonal round head screw, outer sparking electrode crimps the plastics small pieces for generation of identifying fault point.
Preferably, outer sparking electrode is made up of grading ring, and grading ring internal diameter exceeds umbrella leaf external diameter 0-600mm
The beneficial effect that the present invention has is:
1, avoid the problem that existing lightning arrester and insulator partial installation bring, electric discharge series connection air gap distance of the present invention is fixed, can once mounting shaping, easy for installation, maintenance cost is low.
2, the defect that existing portable protective gaps can not stop line tripping is avoided, and easy for installation.
3, compensate for the defect that lightning arrester can not protect induced lightening, can more reliable protection circuit.
4, solve existing porcelain-arm insulator volume large, weight is high, the problem of antifouling property difference.
5, voltage-limiting element and insulation column Integral mold pressing formation, structure is simple, and easy for installation, volume is little, and expense is low.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention and A-A place cutaway view;
Fig. 2 is the embodiment of the present invention 1 structural representation;
Fig. 3 is the structural representation after the embodiment of the present invention 1 removes composite sheath;
Fig. 4 is pressure limiting component structure schematic diagram;
Fig. 5 is the structural representation after voltage-limiting element removing insulating coating
Fig. 6 is the embodiment of the present invention 2 structural representation;
Fig. 7 is the structure chart that the outer sparking electrode of the present invention is connected with sparking electrode outside composite sheath;
Fig. 8, Fig. 9, Figure 10, Figure 11, Figure 12 are the structural representation of sparking electrode and outer sparking electrode;
Figure 13, Figure 14 are respectively the structural representation of 10kV, 35kV system;
Wherein, 1, gold utensil; 2, composite sheath; 3, insulation mandrel; 4, series connection air gap; 5, voltage-limiting element; 6, connecting electrode; 7, insulating coating; 8, sparking electrode; 9, valve block post; 10, installing hole; 11, anti-explosion groove; 12, upper gold utensil; 13, lower gold utensil; 14, annulus platform; 15, intestines shape structural member; 16, pawl; 17, small embossment; 18, outer sparking electrode; 19, bulge loop; 20, protruding; 21, through hole.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described further:
Embodiment 1:
As Figure 1-Figure 5, overhead transmission line cross-arm of the present invention supports voltage limiter, comprise gold utensil 12, lower gold utensil 13, insulation mandrel 3, upper gold utensil 12 and lower gold utensil 13 connect as one formation insulation column by insulation mandrel 3, the upper end of insulation column arranges voltage-limiting element 5, voltage-limiting element 5 adopts loop configuration and is wrapped on insulation mandrel 3, the connecting electrode of voltage-limiting element 5 is threaded connection gold utensil 12, the sparking electrode of voltage-limiting element 5 forms with between lower gold utensil air gap 4 of connecting of discharging, the scope of electric discharge series connection air gap 4 is 10mm-50000mm, insulation column and the molded rear outside mold pressing composite sheath 2 of voltage-limiting element 5 Integral mold, composite sheath 2 can adopt silicon rubber cluster parachute or ceramic cluster parachute.
When voltage-limiting element 5 adopts pie configuration, the voltage-limiting element 5 of cheese is arranged in the one or both sides of insulation mandrel 3, and the connecting electrode of voltage-limiting element 5 connects upper gold utensil 12, also can connect lower gold utensil 13, as long as in side.
Wherein, voltage-limiting element 5 is made up of connecting electrode 6, valve block post 9, sparking electrode 8 and insulating coating 7, and valve block post 9 two ends arrange connecting electrode 6 and sparking electrode 8 respectively, are socketed insulating coating 7 outside valve block post 9, insulating coating 7 are arranged anti-explosion groove 11.Sparking electrode 8 is arranged on inside composite sheath 2 or outside composite sheath 2, sparking electrode can be wrapped in inside composite sheath completely, also can partial denudation outside composite sheath, also can 360 degree of completely exposed outsides at composite sheath, when sparking electrode is drawn, can be connected by screw, sparking electrode to arrange flexibility relatively good, position and flexible structure changeable, as long as can serve as extraction potential electric discharge effect.Sparking electrode 8 is arranged at inside composite sheath 2, and sparking electrode 8 forms discharge channel by puncturing composite sheath; Sparking electrode 8 connects the outer sparking electrode 18 be exposed to outside composite sheath 2, is discharged by two outer sparking electrodes 18.
Sparking electrode as shown in Fig. 8-Figure 12 and outer sparking electrode several structures of adopting.
As shown in Figure 8, sparking electrode 8 comprises an annulus platform 14, annulus platform 14 is arranged three intestines shape structural members 15, three intestines shape structural members 15 exceed annulus platform 14,4-50mm, exceeds the edge 2-50mm of annulus platform 14, and annulus platform 14 and three 15, intestines shape structures adopt die casting to form;
As shown in Figure 10, sparking electrode 8 comprises an annulus platform 14, annulus platform 14 is arranged three pawls 16, form three point of discharges containing internal thread, can be connected with outer sparking electrode 18, three pawls 16 exceed annulus platform 14,4-50mm, exceeds annulus platform 14 edge 2-50mm, and entirety can adopt essence casting to form;
As shown in figure 12, sparking electrode 8 comprises an annulus platform 14, annulus platform 14 is arranged three intestines shape structural members 15, the top of three intestines shape structural members 15 arranges the small embossment 17 containing internal thread, the internal thread diameter of small embossment 17 is 4-40mm, and small embossment 17 is for connecting the outer sparking electrode 18 be exposed to outside composite sheath 2;
As shown in figure 11, sparking electrode 8 is bolted outer sparking electrode 18, and outer sparking electrode 18 is by being stamped to form, overall structure is protruding loop configuration, have 3 holes in the middle of bulge loop 19, the internal diameter of bulge loop 19 is not more than 100mm, is not less than 40mm, the external diameter of bulge loop 19 is not more than 200mm, be not less than 60mm, bulge loop 19 have three projections 20, porose on protruding 20, bolt by outer sparking electrode 18 be connected with sparking electrode inside composite sheath 8, draws discharge potential by the hole on protruding 20;
As shown in Figure 9, sparking electrode 8 is bolted outer sparking electrode 18, outer sparking electrode 18 is formed by die casting, overall structure is made up of two parts, two parts form an outer sparking electrode 18 after coordinating, and outer sparking electrode 18 is close to outside composite sheath, outer sparking electrode 18 has three through holes 21, for being connected with the sparking electrode 8 of inside by bolt, draw discharge potential.The internal diameter of outer sparking electrode is not less than 20mm, and external diameter is not more than 500mm.
Outer sparking electrode 18 adopts pan head screw or hexagonal round head screw, outer sparking electrode 18 crimps the faulty indication for generation of identifying fault point.
Insulation mandrel 3 adopts with the gold utensil 1 at two ends and crimps or the bonding or wedge joint, and connected mode can adopt multiple, ensures enough mechanical properties strength.Upper gold utensil 12 and lower gold utensil 13 adopt conventional cross arm insulator gold utensil, and the shape of gold utensil is unrestricted, as long as play the effect connecting and support.
Embodiment 2:
As shown in Figure 6, overhead transmission line cross-arm of the present invention supports voltage limiter, comprise gold utensil 12, lower gold utensil 13, insulation mandrel 3, upper gold utensil 12 and lower gold utensil 13 connect as one formation insulation column by insulation mandrel 3, the upper end of insulation column arranges voltage-limiting element 5, upper voltage-limiting element 5 adopts loop configuration and is wrapped in insulation mandrel 3 upper end, the connecting electrode of upper voltage-limiting element 5 is threaded connection gold utensil 12, the lower end of insulation column arranges lower voltage-limiting element 5, lower voltage-limiting element 5 adopts loop configuration and is wrapped in insulation mandrel 3 lower end, the connecting electrode of lower voltage-limiting element 5 is threaded connection lower gold utensil 13, electric discharge series connection air gap 4 is formed between the sparking electrode of upper voltage-limiting element 5 and the sparking electrode of lower voltage-limiting element 5, the scope of electric discharge series connection air gap 4 is 10mm-50000mm, insulation column and upper voltage-limiting element 5 and the molded rear outside mold pressing composite sheath 2 of lower voltage-limiting element 5 Integral mold, composite sheath 2 can adopt silicon rubber cluster parachute or ceramic cluster parachute.
Wherein, voltage-limiting element 5 is made up of connecting electrode 6, valve block post 9, sparking electrode 8 and insulating coating 7, and valve block post 9 two ends arrange connecting electrode 6 and sparking electrode 8 respectively, are socketed insulating coating 7 outside valve block post 9, and insulating coating 7 can also arrange anti-explosion groove 11.As shown in Figure 7, sparking electrode 8 is arranged on inside composite sheath 2 or outside composite sheath 2, sparking electrode can be wrapped in inside composite sheath completely, also can partial denudation outside composite sheath, also can 360 degree of completely exposed outsides at composite sheath, when sparking electrode is drawn, can be connected by screw, sparking electrode to arrange flexibility relatively good, position and flexible structure changeable, as long as the effect of extraction potential electric discharge can be served as.Sparking electrode 8 is all arranged at inside composite sheath 2, and sparking electrode 8 forms discharge channel by puncturing composite sheath; Sparking electrode 8 connects the outer sparking electrode 18 be exposed to outside composite sheath 2, is discharged by two outer sparking electrodes 18.
Sparking electrode as shown in Fig. 8-Figure 12 and outer sparking electrode several structures of adopting.
As shown in Figure 8, sparking electrode 8 comprises an annulus platform 14, annulus platform 14 is arranged three intestines shape structural members 15, three intestines shape structural members 15 exceed annulus platform 14,4-50mm, exceeds the edge 2-50mm of annulus platform 14, and annulus platform 14 and three 15, intestines shape structures adopt die casting to form;
As shown in Figure 10, sparking electrode 8 comprises an annulus platform 14, annulus platform 14 is arranged three pawls 16, form three point of discharges containing internal thread, can be connected with outer sparking electrode 18, three pawls 16 exceed annulus platform 14,4-50mm, exceeds annulus platform 14 edge 2-50mm, and entirety can adopt essence casting to form;
As shown in figure 12, sparking electrode 8 comprises an annulus platform 14, annulus platform 14 is arranged three intestines shape structural members 15, the top of three intestines shape structural members 15 arranges the small embossment 17 containing internal thread, the internal thread diameter of small embossment 17 is 4-40mm, and small embossment 17 is for connecting the outer sparking electrode 18 be exposed to outside composite sheath 2;
As shown in figure 11, sparking electrode 8 is bolted outer sparking electrode 18, and outer sparking electrode 18 is by being stamped to form, overall structure is protruding loop configuration, have 3 holes in the middle of bulge loop 19, the internal diameter of bulge loop 19 is not more than 100mm, is not less than 40mm, the external diameter of bulge loop 19 is not more than 200mm, be not less than 60mm, bulge loop 19 have three projections 20, porose on protruding 20, bolt by outer sparking electrode 18 be connected with sparking electrode inside composite sheath 8, draws discharge potential by the hole on protruding 20;
As shown in Figure 9, sparking electrode 8 is bolted outer sparking electrode 18, outer sparking electrode 18 is formed by die casting, overall structure is made up of two parts, two parts form an outer sparking electrode 18 after coordinating, and outer sparking electrode 18 is close to outside composite sheath, outer sparking electrode 18 has three through holes 21, for being connected with the sparking electrode 8 of inside by bolt, draw discharge potential.The internal diameter of outer sparking electrode is not less than 20mm, and external diameter is not more than 500mm.
Outer sparking electrode 18 adopts pan head screw or hexagonal round head screw, outer sparking electrode 18 crimps the faulty indication for generation of identifying fault point.
Upper voltage-limiting element 5 and lower voltage-limiting element 5 adopt the same structure of 1:1 ratio, or adopt the structure of different proportion.The design proportion structure of upper voltage-limiting element and lower voltage-limiting element is not limit, as long as design is at two ends, is discharged by the sparking electrode of upper voltage-limiting element and lower voltage-limiting element, forms electric discharge series connection air gap.Insulation mandrel 3 adopts with the gold utensil 1 at two ends and crimps or the bonding or wedge joint, and connected mode can adopt multiple, ensures enough mechanical properties strength.Upper gold utensil 12 and lower gold utensil 13 adopt conventional cross arm insulator gold utensil, and the shape of gold utensil is unrestricted, as long as play the effect connecting and support.The upper and lower gold utensil of conventional cross arm insulator that gold utensil up and down as shown in Figure 6, Figure 7 adopts.
When upper voltage-limiting element and lower voltage-limiting element employing pie configuration, the upper voltage-limiting element 5 of cheese is arranged in the one or both sides of insulation mandrel 3 upper end, the connecting electrode of upper voltage-limiting element 5 connects upper gold utensil 12, the lower voltage-limiting element 5 of cheese is arranged in the one or both sides of insulation mandrel 3 lower end, and the connecting electrode of lower pressure limiting unit 5 connects lower gold utensil 13.
Embodiment 3:
Overhead transmission line cross-arm of the present invention supports voltage limiter, comprise insulation mandrel 3, insulation mandrel 3 two ends are connected with the gold utensil 1 bearing mechanical force, insulation mandrel 3 arranged outside three voltage-limiting element 5, the voltage-limiting element of top and bottom is injected into one by connecting electrode 6, valve block post 9, sparking electrode 8 and insulating coating 7 or connects into an assembly, valve block post 9 two ends arrange connecting electrode 6 and sparking electrode 8 respectively, are socketed insulating coating 7 outside valve block post 9, middle voltage-limiting element is injected into one by valve block post 9, sparking electrode 8 and insulating coating 7 or connects into an assembly, and valve block post 9 two ends all arrange and connect sparking electrode 8, are socketed insulating coating 7 outside valve block post 9, the connecting electrode of the voltage-limiting element 5 at two ends connects gold utensil 12 and lower gold utensil 13 respectively, middle voltage-limiting element is socketed on insulation mandrel 3, two sparking electrodes that the sparking electrode of upper voltage-limiting element is namely the most adjacent with the sparking electrode on middle voltage-limiting element top form air gap 4 of connecting, two sparking electrodes that the sparking electrode of lower voltage-limiting element is namely the most adjacent with the sparking electrode of middle voltage-limiting element bottom form air gap 4 of connecting, insulation mandrel 3, voltage-limiting element 5 and two ends gold utensil 1 assemble as a whole after carry out integral die, one-shot forming, be combined into one rear outside covered composite yarn overcoat 2.
Wherein, three voltage-limiting element 5 adopt the form of 1:1 structure, also can adopt the version of other different proportion.Connecting electrode 6 is for connecting gold utensil 1, and sparking electrode 8 is for forming series connection air gap 4, and series connection air gap 4 is for bearing system voltage.Valve block post 9 is loop configuration, and valve block post 9 is sleeved on insulation mandrel 3.Sparking electrode 8 is arranged on inside composite sheath 2, or is exposed to outside composite sheath 2.Sparking electrode 8 is arranged at inside composite sheath 2, and sparking electrode 8 forms discharge channel by puncturing composite sheath; Sparking electrode 8 connects the outer sparking electrode 18 be exposed to outside composite sheath 2, is discharged by outer sparking electrode 18.
Several structures that sparking electrode as illustrated in figs. 8-12 and outer sparking electrode adopt.
As shown in Figure 8, sparking electrode 8 comprises an annulus platform 14, annulus platform 14 is arranged three intestines shape structural members 15, three intestines shape structural members 15 exceed annulus platform 14,4-50mm, exceeds the edge 2-50mm of annulus platform 14, and annulus platform 14 and three 15, intestines shape structures adopt die casting to form;
As shown in Figure 10, sparking electrode 8 comprises an annulus platform 14, annulus platform 14 is arranged three pawls 16, form three point of discharges containing internal thread, can be connected with outer sparking electrode 18, three pawls 16 exceed annulus platform 14,4-50mm, exceeds annulus platform 14 edge 2-50mm, and entirety can adopt essence casting to form;
As shown in figure 12, sparking electrode 8 comprises an annulus platform 14, annulus platform 14 is arranged three intestines shape structural members 15, the top of three intestines shape structural members 15 arranges the small embossment 17 containing internal thread, the internal thread diameter of small embossment 17 is 4-40mm, and small embossment 17 is for connecting the outer sparking electrode 18 be exposed to outside composite sheath 2;
As shown in figure 11, sparking electrode 8 is bolted outer sparking electrode 18, and outer sparking electrode 18 is by being stamped to form, overall structure is protruding loop configuration, have 3 holes in the middle of bulge loop 19, the internal diameter of bulge loop 19 is not more than 100mm, is not less than 40mm, the external diameter of bulge loop 19 is not more than 200mm, be not less than 60mm, bulge loop 19 have three projections 20, porose on protruding 20, bolt by outer sparking electrode 18 be connected with sparking electrode inside composite sheath 8, draws discharge potential by the hole on protruding 20;
As shown in Figure 9, sparking electrode 8 is bolted outer sparking electrode 18, outer sparking electrode 18 is formed by die casting, overall structure is made up of two parts, two parts form an outer sparking electrode 18 after coordinating, and outer sparking electrode 18 is close to outside composite sheath, outer sparking electrode 18 has three through holes 21, for being connected with the sparking electrode 8 of inside by bolt, draw discharge potential.The internal diameter of outer sparking electrode is not less than 20mm, and external diameter is not more than 500mm.
Outer sparking electrode 18 adopts pan head screw or hexagonal round head screw, outer sparking electrode 18 crimps the faulty indication for generation of identifying fault point.
As shown in Figure 13, Figure 14, sets forth the embodiment schematic diagram of 10kV, 35kV system;
Operation principle of the present invention:
Described overhead transmission line cross-arm supports voltage limiter when system is normally run, and due to series gap isolation, voltage-limiting element does not bear system cloud gray model voltage.Under the sufficiently high induced lightening of amplitude or the effect of direct lightning strike overvoltage, voltage-limiting element is Low ESR, series gap is breakdown, thunder energy is discharged by valve block post, and after lightning impulse, the voltage being applied to voltage-limiting element body two ends is system cloud gray model voltage, body is high impedance, power frequency continued flow electric arc extinguishes within the extremely short time, and air gap insulation recovers rapidly, and circuit gets back to normal operating condition.
The present invention not only can play the effect of cross arm insulator support wire, voltage-limiting element can also be utilized to improve the lightning protection level of circuit, it is a kind of product integrating support wire and lightning protection, and electric discharge series connection air gap distance fix, can once mounting shaping, structure is simple, easy for installation, compact, lightweight, cost is low.
Claims (10)
1. an overhead transmission line cross-arm supports voltage limiter, it is characterized in that: comprise insulation mandrel (3), insulation mandrel (3) two ends are connected with the gold utensil (1) bearing mechanical force, and insulation mandrel (3) outside at least arranges a voltage-limiting element (5); Adjacent two voltage-limiting element (5) or form air gap of connecting (4) between voltage-limiting element (5) with gold utensil (1); Two ends gold utensil (1), insulation mandrel (3) and voltage-limiting element (5) are combined into one rear outside covered composite yarn overcoat (2).
2. overhead transmission line cross-arm according to claim 1 supports voltage limiter, it is characterized in that: described voltage-limiting element (5) of being set to link together or separate multiple; Series connection air gap (4) is set to one section that links together or the multistage separated.
3. overhead transmission line cross-arm according to claim 1 supports voltage limiter, it is characterized in that: described voltage-limiting element (5) its structure is by connecting electrode (6), valve block post (9), sparking electrode (8) and insulating coating (7) composition, valve block post (9) two ends arrange connecting electrode (6) and sparking electrode (8) respectively, valve block post (9) outside socket insulating coating (7), described connecting electrode (6) is for connecting gold utensil (1), sparking electrode (8) is for forming air gap of connecting (4) with sparking electrode (8) or gold utensil (1), or be connected with outer sparking electrode (18), outer sparking electrode (18) is for forming air gap of connecting (4) with gold utensil (1) or outer sparking electrode (18), series connection air gap (4) is for bearing system voltage.
4. overhead transmission line cross-arm according to claim 1 supports voltage limiter, it is characterized in that: described composite sheath (2) adopts integral die, one-shot forming.
5. overhead transmission line cross-arm according to claim 3 supports voltage limiter, it is characterized in that: described sparking electrode (8) is arranged on composite sheath (2) inner side, or composite sheath (2) outside; When being arranged on composite sheath (2) outside, sparking electrode (8) and outer sparking electrode (18) can adopt integrative-structure, also can be connected by reliable electric with outer sparking electrode (18) and to be exposed to outside composite sheath (2).
6. overhead transmission line cross-arm according to claim 3 supports voltage limiter, it is characterized in that: described valve block post (9) is loop configuration, insulation mandrel (3) is inserted in the middle of valve block post (9), namely can be contacted by insulation filler between insulation mandrel (3) with valve block post (9), also can not contact.
7. overhead transmission line cross-arm according to claim 3 supports voltage limiter, it is characterized in that: described sparking electrode (8) comprises an annulus platform (14), annulus platform (14) is arranged three intestines shape structural members (15), three intestines shape structural members (15) exceed annulus platform (14) 4-50mm, exceed the edge 2-50mm of annulus platform (14), annulus platform (14) and three intestines shape structure (15) parts adopt die casting to form;
Described sparking electrode (8) comprises an annulus platform (14), annulus platform (14) is arranged three pawls (16), form three point of discharges containing internal thread, can be connected with outer sparking electrode (18), three pawls (16) exceed annulus platform (14) 4-50mm, exceed annulus platform (14) edge 2-50mm, entirety can adopt essence casting to form;
Described sparking electrode (8) comprises an annulus platform (14), annulus platform (14) is arranged three intestines shape structural members (15), the top of three intestines shape structural members (15) arranges the small embossment (17) containing internal thread, the internal thread diameter of small embossment (17) is 4-40mm, and small embossment (17) is exposed to the outer sparking electrode (18) in composite sheath (2) outside for connecting;
Described sparking electrode (8) is bolted outer sparking electrode (18), outer sparking electrode (18) is formed by die casting, overall structure is made up of two parts, two parts form an outer sparking electrode (18) after coordinating, outer sparking electrode (18) is close to outside composite sheath, outer sparking electrode (18) there are three holes (21), for being connected with inner sparking electrode (8) by bolt, draw discharge potential, the internal diameter of outer sparking electrode is not less than 20mm, and external diameter is not more than 500mm;
Described sparking electrode (8) connects the outer sparking electrode (18) be made up of pan head screw or hexagonal round head screw;
Described sparking electrode (8) is bolted outer sparking electrode (18), outer sparking electrode (18) is by being stamped to form, overall structure is protruding loop configuration, 3 holes are had in the middle of bulge loop (19), the internal diameter of bulge loop (19) is not more than 100mm, be not less than 40mm, the external diameter of bulge loop (19) is not more than 200mm, be not less than 60mm, bulge loop (19) there are three projections (20), protruding (20) are upper porose, bolt is connected by outer sparking electrode (18) with sparking electrode inside composite sheath (8) by the hole on protruding (20), draw discharge potential.
8. overhead transmission line cross-arm according to claim 3 supports voltage limiter, it is characterized in that: described sparking electrode (8) is all arranged at composite sheath (2) inner side, sparking electrode (8) forms discharge channel by puncturing composite sheath;
Described sparking electrode (8) connects the outer sparking electrode (18) being exposed to composite sheath (2) outside, is discharged by two outer sparking electrodes (18).
9. overhead transmission line cross-arm according to claim 7 supports voltage limiter, it is characterized in that: described outer sparking electrode (18) adopts pan head screw or hexagonal round head screw, the upper crimping of outer sparking electrode (18) is for generation of the faulty indication that can identify fault point.
10. overhead transmission line cross-arm according to claim 7 supports voltage limiter, it is characterized in that: described outer sparking electrode (18) is made up of grading ring, and grading ring internal diameter exceeds umbrella leaf external diameter 0-600mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510519142.3A CN105070427A (en) | 2015-08-22 | 2015-08-22 | Cross arm support voltage limiter for overhead line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510519142.3A CN105070427A (en) | 2015-08-22 | 2015-08-22 | Cross arm support voltage limiter for overhead line |
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| Publication Number | Publication Date |
|---|---|
| CN105070427A true CN105070427A (en) | 2015-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510519142.3A Pending CN105070427A (en) | 2015-08-22 | 2015-08-22 | Cross arm support voltage limiter for overhead line |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105790074A (en) * | 2016-03-31 | 2016-07-20 | 山东迅实电气有限公司 | Insulator voltage limiter for urban mass transit overhead contact system |
| CN107680756A (en) * | 2017-09-28 | 2018-02-09 | 上海兆邦电力器材有限公司 | Laddering electric discharge device step by step |
| CN108365519A (en) * | 2018-02-07 | 2018-08-03 | 国网湖北省电力有限公司电力科学研究院 | A kind of transmission line of electricity overvoltage protection |
-
2015
- 2015-08-22 CN CN201510519142.3A patent/CN105070427A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105790074A (en) * | 2016-03-31 | 2016-07-20 | 山东迅实电气有限公司 | Insulator voltage limiter for urban mass transit overhead contact system |
| CN107680756A (en) * | 2017-09-28 | 2018-02-09 | 上海兆邦电力器材有限公司 | Laddering electric discharge device step by step |
| CN108365519A (en) * | 2018-02-07 | 2018-08-03 | 国网湖北省电力有限公司电力科学研究院 | A kind of transmission line of electricity overvoltage protection |
| CN108365519B (en) * | 2018-02-07 | 2023-12-19 | 国网湖北省电力有限公司电力科学研究院 | Overvoltage protection device for power transmission line |
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Application publication date: 20151118 |