CN203014162U - 500-kilovolt overhead transmission line suspension-string parallel-gap anti-lighting protective device - Google Patents
500-kilovolt overhead transmission line suspension-string parallel-gap anti-lighting protective device Download PDFInfo
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- CN203014162U CN203014162U CN 201220688280 CN201220688280U CN203014162U CN 203014162 U CN203014162 U CN 203014162U CN 201220688280 CN201220688280 CN 201220688280 CN 201220688280 U CN201220688280 U CN 201220688280U CN 203014162 U CN203014162 U CN 203014162U
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Abstract
The utility model relates to a 500-kilovolt overhead transmission line suspension-string parallel-gap anti-lighting protective device, belonging to the technical field of transmission line anti-lighting protection. The anti-lighting protective device is additionally provided with a parallel gap on the basis of the prior art. The parallel gap is composed of an upper grounding-side rod-shaped arcing rod and a lower lead-side saddle-shaped arcing rod. The upper grounding-side rod-shaped arcing rod is fixed through an upper yoke plate at one side of the upper portions of left and right insulator strings. The lower lead-side saddle-shaped arcing rod is fixed through a lower yoke plate and a supporting rack at one side of the lower portion of the left insulator string. The parallel-gap anti-lighting protective device provided by the utility model is applicable to 500-kilovolt overhead transmission lines and is capable of functioning to protect the line suspension insulator strings when the lines are struck by lightning and to guarantee the success of reclosing after the occurrence of lightning accidents.
Description
Technical field
The utility model relates to a kind of 500 kilovolts of overhead transmission line suspension string parallel gap lightning protection devices, belongs to transmission line lightning-protection engineering field.
Background technology
Along with the increase of transmission line rated voltage, the corresponding raising of ratio that the lightning stroke trip accident of adding up both at home and abroad accounts for total number of accident, the lightning strike accident of 500 kilovolts, China and following electric pressure transmission line just accounts for more than 50% of total accident.Thunder and lightning cause power frequency arc that the insulator string flashover produces can calcination, damage the surface insulation layer of insulator string, serious situation even may cause insulator string occur disrumpent feelings, fall string, greatly affected the safe operation of transmission line.Therefore, the overhead transmission line fault that causes due to thunderbolt is one of major failure type of overhead transmission line.
Existing Lightning Protection on Power Transmission Lines measure is mainly " blocking type " protected mode, and its core concept is to improve as much as possible the lightning withstand level of circuit, reduces tripping rate with lightning strike.Along with the reinforcement of electrical network framework, the generally application of relaying protection and reclosing device can adopt " leading-type " lightning protection to replenish as the strong of " blocking type " lightning protection measures, with the low small probability problem of lightning that solves transmission line that drops into.Under " leading-type " lightning protection thought guidance, proposed often be struck by lightning or the electric transmission line isolator of pollution flashover on parallel connection gaps is installed the lightning protection scheme.
Fig. 1 is the outline drawing of existing uninstalled 500 kilovolts of overhead transmission line suspension strings.Wherein, insulator string is comprised of two each 29 composite insulators of string.Long L=H * the 29=155 of composite insulator string string * 29=4495mm, the diameter D1=400mm of full skirt, two insulator string centre distance D2=500mm.
The principle of insulator parallel connection gaps lightning protection is: in insulator string two ends pair of metal electrodes in parallel (claiming again to recruit arc rod or arc leading angle), consist of and protect the gap, usually protect the distance in gap long less than the string of insulator string.When overhead transmission line is struck by lightning, produce very high lightning overvoltage on insulator string, but because of the lightning impulse discharge voltage in the protection gap discharge voltage lower than insulator string, therefore at first discharge in the protection gap.The power frequency arc that continues by the formed discharge channel of parallel connection gaps, is directed to and recruits the arc stick end under electric power and thermal stress effect, be fixed on and recruit the burning of arc stick end, thereby the protection insulator avoids the electric arc calcination.Its core concept can be summarized as and allow circuit that certain tripping rate with lightning strike is arranged, and adopts inter space device in parallel with insulator string, and thunder energy is discharged by gap discharge, dredges power frequency arc.Though lightning stroke flashover is arranged, and reclosing can be successful, without permanent fault.
Summary of the invention
The utility model purpose is to propose a kind of parallel clearance lightning protection device that is applicable to 500 kilovolts of overhead transmission line suspension strings; change the structure of existing lightning protection device; to change the path of electric arc in the lightning overvoltage discharge process, reach the purpose of the built on stilts transmission circuit insulator string of protection.
500 kilovolts of overhead transmission line suspension string parallel gap lightning protection devices that the utility model proposes, this lightning protection device comprises a plurality of composite insulators, the mutual intussusception of a plurality of composite insulators connects, form left insulator string and right insulator string, each is connected the top of left insulator string and right insulator string with suspension rod, the bottom of left insulator string and the bottom of right insulator string are fixed on side of wire was track type grading ring, characterized by further comprising a parallel connection gaps, described parallel connection gaps recruits arc rod and the lower wire side shape of a saddle to recruit the arc rod to form by top ground connection paraphysis shape, described top ground connection paraphysis shape recruits the arc rod to be fixed on top one side of left insulator string and right two insulator strings by the top yoke plate, the described lower wire side shape of a saddle recruits the arc rod to be fixed on a side of left insulator string bottom by bottom yoke plate and bracing frame.
500 kilovolts of overhead transmission line suspension string parallel gap lightning protection devices that the utility model proposes, its advantage are, are applicable to 500 kilovolts of overhead transmission lines, when circuit is struck by lightning, can play the effect of protection circuit suspension insulator; After lightning strike accident occurs, can guarantee the reclosing success.
Description of drawings
Fig. 1 is the existing outline drawing that the two strings of 500 kilovolts of overhead transmission line suspension insulators of parallel connection gaps are not installed.
Fig. 2 is the structural representation of 500 kilovolts of overhead transmission line suspension string parallel gap lightning protection devices the utility model proposes.
Fig. 3 is the structural representation that lightning protection device shown in Figure 2 middle and upper part ground connection paraphysis shape is recruited the arc rod.
Fig. 4 is the vertical view that the lightning protection device shown in Figure 2 middle and lower part side of wire was shape of a saddle is recruited the arc rod.
Fig. 5 is that the two strings of 500 kilovolts of insulators are installed the voltage distribution map of parallel connection gaps front and back.
In Fig. 1-Fig. 4, the 1st, composite insulator, the 2nd, side of wire was track type grading ring, the 3rd, attachment bolt, the 4th, suspension rod, the 5th, top yoke plate, the 6th, top ground connection paraphysis shape is recruited the arc rod, the 7th, the lower wire side shape of a saddle is recruited arc rod, the 8th, bottom yoke plate, the 9th, bracing frame, D1 is the insulator umbrella maximum gauge, D2 is two insulator string centre distances, and L is that the composite insulator string string is long, and L1 is the shortest air gap distance of parallel connection gaps.
Embodiment
500 kilovolts of overhead transmission line suspension string parallel gap lightning protection devices that the utility model proposes; its structure as shown in Figure 2; comprise a plurality of composite insulators 1; the mutual intussusception of a plurality of composite insulators connects; form left insulator string and right insulator string; the top of left insulator string and right insulator string is connected with suspension rod 4 by attachment bolt 3, and the bottom of left insulator string and the bottom of right insulator string are fixed on side of wire was track type grading ring 2.Also comprise a parallel connection gaps, this parallel connection gaps recruits arc rod 6 and the lower wire side shape of a saddle to recruit arc rod 7 to form by top ground connection paraphysis shape, top ground connection paraphysis shape recruits arc rod 6 to be fixed on top one side of left insulator string and right two insulator strings by top yoke plate 5, and the lower wire side shape of a saddle recruits arc rod 7 to be fixed on a side of left insulator string bottom by bottom yoke plate 8 and bracing frame 9.
In an embodiment of the present utility model, suspension insulator is comprised of 29 composite insulators of two strings.The lower wire side shape of a saddle recruits the end of arc rod 7 to upwarp, and caliber is 50mm, with horizontal angle theta be 45～60 °, shape of a saddle semi-circular portions radius is 200mm, requires top car circle.Circular hole is left in the coupling part, and Circularhole diameter is 20～30mm.
Below with reference to accompanying drawing also in conjunction with the embodiments, describe content of the present utility model in detail.
Fig. 2 is the structural representation of 500 kilovolts of overhead transmission line suspension string parallel gap lightning protection devices the utility model proposes.Wherein, insulator string is comprised of two each 29 composite insulators of string.Long L=H * the 29=155 of composite insulator string string * 29=4495mm, the shortest air gap distance of parallel connection gaps represents with L1.Ground connection side parallel connection gaps uses the clavate structure, and its horizontal offset distance represents with Hg, probes into the degree of depth and represents with Dg.The side of wire was parallel connection gaps uses shape of a saddle Equalized voltage ring construction, and its horizontal offset distance represents with Hc, probes into the degree of depth and represents with Dc.
Fig. 3 is the structural representation that lightning protection device shown in Figure 2 middle and upper part ground connection paraphysis shape is recruited the arc rod.This trick arc rod outer surface is carried out polishing, so that smooth surface, integral body is carried out hot galvanizing.Recruit the arc rod to use diameter to be the aluminium-alloy pipe of 50mm, wall thickness is 1.2mm.Dg and Hg represent respectively the horizontal offset distance of this trick arc rod and probe into the degree of depth.See from structural representation, this trick arc rod all is connected on same yoke plate with two insulator strings.
Fig. 4 is the vertical view that the lightning protection device shown in Figure 2 middle and lower part side of wire was shape of a saddle is recruited the arc rod.Grading ring uses caliber to be the aluminium-alloy pipe of 50mm, and wall thickness is 1.2mm, will polish especially to weld.See from Fig. 4, the diameter of semicircular ring represents with R3, R3=200mm.
Before actual production is used; according to Finite Element Electric Field Simulation result of calculation; above 500 kilovolts of overhead transmission line suspension string parallel gap lightning protection devices can play the effect that on the uniform insulation substring, voltage distributes, the 30kV/cm when on parallel connection gaps, maximum field intensity is no more than atmospherical discharges simultaneously.
The Voltage distribution computation that 500 kilovolts of composite insulator suspension string in overhead transmission lines are installed before and after parallel gap lightning protection device of the present utility model the results are shown in Figure 5; abscissa in figure is insulator umbrella numbering (arranging along side of wire was to the ground connection side direction), and ordinate is the voltage percentage that each insulator umbrella bears.Near the side of wire was part, insulator string is installed parallel connection gaps and is compared with the parallel connection gaps situation is not installed for insulator string, near first insulator umbrella lower voltage 7.25% of side of wire was.Simultaneously, near ground connection side part, insulator string is installed parallel connection gaps and is compared with the parallel connection gaps situation is not installed for insulator string, near first insulator umbrella lower voltage 6.89% of ground connection side.As seen, at insulator two ends installation parallel connection gaps, the voltage that has effectively improved insulator distributes, and particularly near the Potential distribution at insulator string two ends, has verified the stepless action of parallel connection gaps to the composite insulator both end voltage.Due to the low conductivity of profile characteristics, hardware fitting structure and the silastic material of composite insulator, produce higher electric field near its height pressure side and make Potential distribution begin quick decay from the height pressure side.Parallel connection gaps is installed on composite insulator is actually and has improved height high electrode shape, strengthened the radius of curvature of High-Field strength electrode surface.
Claims (1)
1. one kind 500 kilovolts overhead transmission line suspension string parallel gap lightning protection devices, this lightning protection device comprises a plurality of composite insulators, the mutual intussusception of a plurality of composite insulators connects, form left insulator string and right insulator string, each is connected the top of left insulator string and right insulator string with suspension rod, the bottom of left insulator string and the bottom of right insulator string are fixed on side of wire was track type grading ring, characterized by further comprising a parallel connection gaps, described parallel connection gaps recruits arc rod and the lower wire side shape of a saddle to recruit the arc rod to form by top ground connection paraphysis shape, described top ground connection paraphysis shape recruits the arc rod to be fixed on top one side of left insulator string and right two insulator strings by the top yoke plate, the described lower wire side shape of a saddle recruits the arc rod to be fixed on a side of left insulator string bottom by bottom yoke plate and bracing frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220688280 CN203014162U (en) | 2012-12-13 | 2012-12-13 | 500-kilovolt overhead transmission line suspension-string parallel-gap anti-lighting protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220688280 CN203014162U (en) | 2012-12-13 | 2012-12-13 | 500-kilovolt overhead transmission line suspension-string parallel-gap anti-lighting protective device |
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| Publication Number | Publication Date |
|---|---|
| CN203014162U true CN203014162U (en) | 2013-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220688280 Expired - Lifetime CN203014162U (en) | 2012-12-13 | 2012-12-13 | 500-kilovolt overhead transmission line suspension-string parallel-gap anti-lighting protective device |
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| CN (1) | CN203014162U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104008828A (en) * | 2014-06-11 | 2014-08-27 | 国家电网公司 | Discharge gap device |
| CN107230534A (en) * | 2017-07-20 | 2017-10-03 | 云南电网有限责任公司电力科学研究院 | A kind of 220kV single ball-type parallel connection clearance devices used for transmission line |
-
2012
- 2012-12-13 CN CN 201220688280 patent/CN203014162U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104008828A (en) * | 2014-06-11 | 2014-08-27 | 国家电网公司 | Discharge gap device |
| CN104008828B (en) * | 2014-06-11 | 2017-06-20 | 国家电网公司 | A kind of discharging gap apparatus |
| CN107230534A (en) * | 2017-07-20 | 2017-10-03 | 云南电网有限责任公司电力科学研究院 | A kind of 220kV single ball-type parallel connection clearance devices used for transmission line |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130619 |
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| CX01 | Expiry of patent term |