CN201514819U - Lightning protection insulator for insulated conductor for overhead line - Google Patents

Lightning protection insulator for insulated conductor for overhead line Download PDF

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Publication number
CN201514819U
CN201514819U CN2009201793804U CN200920179380U CN201514819U CN 201514819 U CN201514819 U CN 201514819U CN 2009201793804 U CN2009201793804 U CN 2009201793804U CN 200920179380 U CN200920179380 U CN 200920179380U CN 201514819 U CN201514819 U CN 201514819U
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CN
China
Prior art keywords
insulator
lightning
insulated conductor
lightning arrester
overhead line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CN2009201793804U
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Chinese (zh)
Inventor
尹彬
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SHANDONG XUNSHI ELECTRIC CO Ltd
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SHANDONG XUNSHI ELECTRIC CO Ltd
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Priority to CN2009201793804U priority Critical patent/CN201514819U/en
Application granted granted Critical
Publication of CN201514819U publication Critical patent/CN201514819U/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

The utility model discloses a lightning protection insulator used for an insulated conductor for an overhead line. The lightning protection insulator comprises a lightning protector body and an insulator; the insulator is vertically fixed on a pole tower cross arm, the lightning protector body is vertically assembled on the insulator, the insulated conductor is erected at the top end of the lightning protector body, and an equalizing ring is arranged between the bottom end of the lightning protector body and the insulator and reliably and electrically connected with an internal electrode of the lightning protector body; a run-on plate is arranged between the insulator and the cross arm and firmly and electrically connected with the pole tower cross arm; and a discharge air gap is formed between the equalizing ring and the run-on plate. The utility model has the advantages of small volume, light weight, simple installation, high reliability and convenient maintenance, and can effectively protect the insulated conductor for the overhead line from being damaged caused by lightning strike..

Description

Lightning protection insulator for insulated conductor of overhead line
Technical field
The utility model relates to the electric power system overhead distribution, relate in particular to a kind of lightning protection insulator for insulated conductor of overhead line, at power distribution network 10-35kV system suspended insulated guide wire lightning-caused breaking problem, can prevent effectively that insulated conductor from damaging because of Lightning Over-voltage.
Background technology
In power distribution network, adopt insulated conductor to solve corridor that plain conductor can't resolve and safety problem, compare with cable, adopt the insulated conductor reduced investment, build soon, advantage is fairly obvious.Developed countries has gradually adopted suspended insulated guide wire from the later stage sixties 20th century.But insulated conductor also has the weakness of himself, i.e. lightning-caused breaking problem, and so-called thunderbolt must be broken.Therefore, must properly settle the lightning-caused breaking problem.
According to the mechanism of insulated conductor lightning-caused breaking, the corresponding precautionary measures have " dredge and stop up " dual mode." dredging " is exactly with near the local bare wireization of the insulated conductor the insulator, make power frequency arc arc root shift or be fixed on the special gold utensil and burn, thereby guardwire avoids burn.For example, peel off at insulator and wire coupling place insulating barrier, adopt arc protection molded lines folder or the insulated conductor of insulator both sides peeled off one section insulating barrier and installed the preventing arc wire clamp additional.Simple to operate, the small investment of the mode of " dredging formula ", but lead is local exposed, has sealing and insulation defect." obstruction " is exactly to stop the power frequency continued flow starting the arc behind the lightning stroke flashover.For example, adopt the current-limiting arc-extinguishing angle, i.e. the ring-like external series gap metal oxide arrester of band series connection.Compare " dredging formula ", the mode better protecting effect of " blocking type ", shortcoming are the construction relative complex, and cost is higher.
China implements insulating since the eighties to the built on stilts net of city power distribution and transforms pilot, has accelerated paces the nineties.In recent years, along with the increase of insulated conductor area coverage in the power distribution network, the lightning-caused breaking problem is also day by day obviously got up.China is late to the starting of insulated conductor lightning-caused breaking Study on Problems, also is in the stage of fumbling at present.
Summary of the invention
Technical problem to be solved in the utility model is: above-mentioned " blocking type " principle of a kind of employing is provided and overcomes the prior art defective, be adapted at the novel lightning protection insulator that uses on the 10-35kV suspended insulated guide wire, volume is little, and is in light weight, easy for installation, reliability is high, easy to maintenance.
The technical scheme that the utility model adopted is: a kind of lightning protection insulator for insulated conductor of overhead line, comprise lightning arrester body 1 and insulator 2, insulator 2 vertically is fixed on the shaft tower cross-arm 9, insulated conductor 8 is erected at the top of lightning arrester body 1, it is characterized in that, lightning arrester body 1 vertically is assemblied on the insulator 2, also is provided with grading ring 3 between the bottom of lightning arrester body 1 and the insulator 2, and described grading ring 3 reliably electrically connects with the internal electrode of lightning arrester body 1; Between insulator 2 and cross-arm 9 run-on tab 5 is set also, described run-on tab 5 firmly electrically connects with shaft tower cross-arm 9; Form air gap 15 between described grading ring 3 and the run-on tab 5.
Wherein preferred version is:
The fit of described lightning arrester body 1 and insulator 2 is: core rod of insulator seals in the annular valve block 12 of lightning arrester body 1, and lightning arrester body 1 is combined into one up and down with insulator 2, uses an external insulation sleeve jointly.
Described core rod of insulator also can be the side that seals in annular valve block 12 in the lightning arrester body 1.
Described core rod of insulator can be composite material or porcelain.
Described lightning arrester body 1 can be composite material or porcelain with the external insulation sleeve of insulator 2.
Described core rod of insulator diameter range is between the 16-80 millimeter.
Described run-on tab 5 adopts gold utensil electrode 16 realizations down.
Described lightning arrester and insulator are combined into one up and down, make the insulator load, and arrester valve piece made is stressed hardly, and be stressed all in load mechanism.
Described grading ring 3 is drawn and is reliably electrically connected with it from the internal electrode of lightning arrester body 1, constitutes the external series gap of connecting between described grading ring 3 and the low-field electrode run-on tab 5; This series connection external series gap can satisfy the requirement of industrial frequency withstand voltage, can satisfy the requirement of barrier systems voltage again.
The utility model has been filled up the domestic technique blank, owing to adopted above-mentioned technical scheme, had following advantage: (1) lightning protection insulator overcoat of the present utility model adopts composite material or a compression moulding of porcelain, and volume is little, in light weight, easy for installation, reliability is high, easy to maintenance; (2) the utility model integrated assembling metal oxide arrester on the basis of discharge clamp post composite insulators, to discharge clamp composite insulator and metal oxide arrester combines together, taken into account the advantage of discharge clamp insulator and metal oxide arrester, when the thunderbolt lead, at first discharge in the air gap that constitutes between grading ring and run-on tab, lightning current discharges through zinc oxide nonlinear resistance slice, reduced the potential difference between lead and the ground, guarantee no longer flashover of insulator, thereby avoid line tripping to have a power failure, and after the lightning current, the moment increase of non-linear resistor equivalent resistance, power frequency continued flow is then blocked, therefore can scaling loss lead and discharging gap, thus protected insulated conductor of overhead line in lightning stroke process, can not break; (3) constitute the air gap between grading ring and run-on tab,, can guarantee that lightning discharge occurs between this air gap by experimental study adjusting play distance.
Description of drawings
Fig. 1 is a vertical mounting structure schematic diagram of the present utility model;
Fig. 2 is the mandrel structure schematic diagram of lightning protection insulator band valve block of the present utility model;
Fig. 3 is a grading ring structural representation of the present utility model;
Fig. 4 is the structural representation of gold utensil electrode under another embodiment of the utility model run-on tab;
Among the figure: 16 times gold utensil electrodes in gold utensil 5 run-on tab 6 bolts, 7 grading ring hold-down screw 8 insulated conductors, 9 cross-arm 10 optical wands, 11 latch bracket 12 valve blocks, 13 winding layers 14 times gold utensils, 15 air gaps on 1 lightning arrester body, 2 insulators, 3 grading rings 4
Embodiment
Specifically describe embodiment of the present utility model below with reference to accompanying drawing.
As shown in Figure 1, a kind of lightning protection insulator for insulated conductor of overhead line, comprise lightning arrester body 1, insulator 2, grading ring 3, run-on tab 5, air gap 15, insulator 2 lower ends are fixed on the shaft tower cross-arm 9, the fixing lightning arrester body 1 of supporting in upper end, insulated conductor 8 is erected at the top of lightning arrester body 1, also is provided with grading ring 3 between the bottom of lightning arrester body 1 and the insulator 2, and grading ring 3 is drawn and reliably electrically connected with it from the internal electrode of lightning arrester body 1; Between insulator 2 and cross-arm 9 run-on tab 5 is set, described run-on tab 5 firmly electrically connects with shaft tower cross-arm 9; Form air gap 15 between described grading ring 3 and the run-on tab 5.
In the present embodiment, the fit of lightning arrester body 1 and insulator 2 is: insulator 2 plugs seal in the annular valve block of lightning arrester body 1, also can be plug in the valve block side, lightning arrester body 1 is combined into one up and down with insulator 2, uses an external insulation sleeve jointly.Because the plug supports of one are up and down adopted in 2 designs of lightning arrester 1 and insulator, overcoat adopts composite material or a compression moulding of porcelain, thereby it is little, in light weight to have a volume, and simple, reliability characteristics high, easy to maintenance are installed; Lightning arrester 1 is made up of last gold utensil 4, following gold utensil 14 and optical wand 10 with the plug of insulator 2 as shown in Figure 2, and optical wand 10 presses together by interference fit with last gold utensil 4, following gold utensil 14, and thickness was unequal about optical wand 10 can be made, and also can make straight.Top lightning arrester section can be omited carefully, bottom insulator section can be omited slightly, on the one hand for the cooperate consideration of lightning arrester with insulator, consider for the mechanical electric performance of lightning arrester and insulator on the other hand, promptly by lightning arrester and insulator are integrated, make the insulator load, arrester valve piece made is stressed hardly, and is stressed all in load mechanisms such as plug.
The structure of lightning arrester body 1 can be with reference to the cooperate figure of arrester valve piece made 12 shown in Figure 2 with plug, valve block 12 can adopt metal oxide resistance such as zinc oxide nonlinear resistance slice, valve block 12 be shaped as annular, string is on the top of lightning protection insulator optical wand 10, be equipped with latch bracket 11 between the upper end of valve block 12 and the last gold utensil 4, to guarantee to electrically connect mutually closely, be equipped with grading ring 3 in the connection of the lower end of valve block 12, evenly distribute to improve its voltage on every side.The lightning arrester structure of above-mentioned metal oxide resistance series connection, in light weight, easy for installation, behind the gap discharge,, played the effect of arc extinguishing outside because metal oxide resistance is high resistive.
Insulator 2 can adopt composite post insulator or suspension insulator structure, and the composition material of core rod of insulator is not single, can be composite material, also can be porcelain; Equally, overcoat can be a composite material, also can be porcelain, and promptly outer umbrella sleeve can adopt organic combined insulated material such as silicon rubber or porcelain full skirt.The used diameter of mandrel scope of insulator scalable, requirement difference according to bending strength, can select between the 16-80 millimeter, for strengthening the mechanical strength of lightening arrestor insulator, twine formation winding layer 13 with epoxy resin simultaneously in the lightning arrester 1 and the junction of insulator 2.
The last gold utensil 4 of lightning arrester body 1 high-pressure side is provided with the groove that end radius of circle and insulated conductor radius are complementary, and insulated conductor 8 is erected in the groove of gold utensil 4, and concrete installation method is installed according to 10kV insulator neck hypodesmus or 10kV insulator top hypodesmus.
Be processed with bolt hole on the following gold utensil 14 of insulator 2 lower ends, fix by bolt 6 and cross-arm 9.Run-on tab 5 is installed between cross-arm 9 and the insulator 2.Have strip hole on the horizonal base plate of run-on tab 5, conveniently move horizontally the adjustment air gap distance; The structure of run-on tab 5 at first has a horizonal base plate to be fixedly mounted on the shaft tower cross-arm 9 so that be grounded after firmly electrically connecting with shaft tower cross-arm 9, goes up folding and oblique outer the stretching, extension then, with grading ring 3 equal height places outside roll over and form a horizontal top surface.
Grading ring 3 and two electrodes of run-on tab 5 as the present embodiment lightning protection insulator, its discharge air gap 15 is made of the air of 5 of high-field electrode grading rings 3, low-field electrode run-on tab, this series connection external series gap can satisfy the requirement of industrial frequency withstand voltage, can satisfy the requirement of barrier systems voltage again.The numerical value of air gap 15 is determined through repetition test, is all occurred in this air gap 15 to guarantee lightning discharge.Should outer discharging gap make lightning overvoltage be delivered to grading ring 3 very soon and reliably and by being connected between the run-on tab 5 of ground connection with the shaft tower cross-arm; be released by gap discharge; thereby the short circuiting arc energy that will be struck by lightning shifted from lead in the extremely short time, thereby the protection insulated cable is avoided the thunderbolt injury.
Fig. 3 is a grading ring structural representation of the present utility model, uniformly-spaced be with holes on the grading ring 3, purpose is that grading ring 3 is fixedly connected grading ring 3 and lightning arrester 1 by grading ring hold-down screw 7, grading ring 3 is drawn and reliably is electrically connected from lightning arrester 1 internal electrode, constitutes the external series gap of connecting between grading ring and the low-field electrode.
The shape that constitutes discharge air gap low-field electrode in the utility model is not single, can draw a run-on tab separately as low-field electrode, can utilize down gold utensil as low-field electrode yet.
Fig. 4 shows as another embodiment of the present utility model, utilizes the structural representation when gold utensil is as run-on tab down.Following gold utensil 14 tops that are connected with insulator 2 lower ends among Fig. 4 process circular boop conduct gold utensil electrode 16 down, utilize down that gold utensil electrode 16 constitutes the discharge air gaps as low-field electrode and grading ring 3, following gold utensil electrode 16 is by the path of releasing of gold utensil 14, shaft tower cross-arm 9 formation lightning currents down.
Operation principle of the present utility model and process: when normally moving in system; insulator is isolated power-frequency voltage; lightning arrester body bears voltage hardly; under the lightning overvoltage effect of direct lightning strike or the generation of induction thunder; the lightning arrester body conducting; lightning arrester body presents Low ESR; air gap between grading ring and run-on tab is breakdown; lightning current is by last gold utensil 4; the valve block 12 of lightning arrester body 1 is delivered to grading ring 3 soon; be delivered to run-on tab 5 or following gold utensil electrode 16 through discharge air gap 15; release into ground by iron cross arm or earth connection again, thereby protected insulated circuit.After the lightning impulse, moment becomes big to the resistance of lightning arrester body again, the electric current that passes through is that arc current is suppressed in low numerical value, increase falls in the air gap arc voltage, the insulation in insulator gap recovers rapidly, electric arc extinguishes in the short time naturally at the utmost point, and power frequency continued flow is interdicted fully, is difficult for causing line tripping or circuit can be resumed operation by high-speed reclosure.
Lightning protection insulator of the present utility model only illustrates some preferred embodiments in this manual, is not to its restriction.This professional and technical personnel can structurally make other variation or modification according to the present utility model design and spirit, for example change the shape of run-on tab, the profile of silicon rubber umbrella cover etc., but these must belong to protection range of the present utility model.

Claims (9)

1. lightning protection insulator for insulated conductor of overhead line, comprise lightning arrester body (1) and insulator (2), insulator (2) vertically is fixed on the shaft tower cross-arm (9), insulated conductor (8) is erected at the top of lightning arrester body (1), it is characterized in that, lightning arrester body (1) vertically is assemblied on the insulator (2), be provided with grading ring (3) between the bottom of lightning arrester body (1) and the insulator (2), described grading ring (3) reliably electrically connects with the internal electrode of lightning arrester body (1), between insulator (2) and cross-arm (9), run-on tab (5) is set, described run-on tab (5) firmly electrically connects with shaft tower cross-arm (9), forms air gap (15) between described grading ring (3) and the run-on tab (5).
2. lightning protection insulator for insulated conductor of overhead line according to claim 1, it is characterized in that: the fit of described lightning arrester body (1) and insulator (2) is: core rod of insulator seals in the annular valve block (12) of lightning arrester body (1), lightning arrester body (1) is combined into one up and down with insulator (2), uses an external insulation sleeve jointly.
3. lightning protection insulator for insulated conductor of overhead line according to claim 2 is characterized in that: described core rod of insulator seals in the side of annular valve block (12) in the lightning arrester body (1).
4. according to claim 2 or 3 described lightning protection insulator for insulated conductor of overhead line, it is characterized in that: described core rod of insulator can be composite material or porcelain.
5. according to claim 2 or 3 described lightning protection insulator for insulated conductor of overhead line, it is characterized in that: described lightning arrester body (1) can be composite material or porcelain with the external insulation sleeve of insulator (2).
6. according to claim 2 or 3 described lightning protection insulator for insulated conductor of overhead line, it is characterized in that: described core rod of insulator diameter range is between the 16-80 millimeter.
7. lightning protection insulator for insulated conductor of overhead line according to claim 1 and 2 is characterized in that: described run-on tab (5) adopts gold utensil electrode (16) realization down.
8. lightning protection insulator for insulated conductor of overhead line according to claim 1 and 2 is characterized in that: described lightning arrester and insulator are combined into one up and down, make the insulator load, and arrester valve piece made is stressed hardly, and be stressed all in load mechanism.
9. lightning protection insulator for insulated conductor of overhead line according to claim 1 and 2, it is characterized in that: described grading ring (3) is drawn and is reliably electrically connected with it from the internal electrode of lightning arrester body (1), constitute the external series gap of connecting between described grading ring (3) and the low-field electrode run-on tab (5), this series connection external series gap can satisfy the requirement of industrial frequency withstand voltage, can satisfy the requirement of barrier systems voltage again.
CN2009201793804U 2009-10-24 2009-10-24 Lightning protection insulator for insulated conductor for overhead line Expired - Lifetime CN201514819U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2009201793804U CN201514819U (en) 2009-10-24 2009-10-24 Lightning protection insulator for insulated conductor for overhead line

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Application Number Priority Date Filing Date Title
CN2009201793804U CN201514819U (en) 2009-10-24 2009-10-24 Lightning protection insulator for insulated conductor for overhead line

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101697299B (en) * 2009-10-24 2011-08-17 山东迅实电气有限公司 Lightning protection insulator for insulated conductor of overhead line
CN104319036A (en) * 2014-11-07 2015-01-28 北京铁道工程机电技术研究所有限公司 Insulator used for motor train unit at high and cold areas

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101697299B (en) * 2009-10-24 2011-08-17 山东迅实电气有限公司 Lightning protection insulator for insulated conductor of overhead line
CN104319036A (en) * 2014-11-07 2015-01-28 北京铁道工程机电技术研究所有限公司 Insulator used for motor train unit at high and cold areas

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C14 Grant of patent or utility model
GR01 Patent grant
AV01 Patent right actively abandoned

Granted publication date: 20100623

Effective date of abandoning: 20091024