CN205160010U - Ground connection system that hinders falls in electric power lightning protection - Google Patents

Ground connection system that hinders falls in electric power lightning protection Download PDF

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Publication number
CN205160010U
CN205160010U CN201521020917.4U CN201521020917U CN205160010U CN 205160010 U CN205160010 U CN 205160010U CN 201521020917 U CN201521020917 U CN 201521020917U CN 205160010 U CN205160010 U CN 205160010U
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China
Prior art keywords
hoop
electric power
connection
earth connection
lightning protection
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CN201521020917.4U
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Chinese (zh)
Inventor
曾宏
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Sichuan Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Sichuan Electric Power Co Ltd
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Abstract

The utility model discloses a ground connection system that hinders falls in electric power lightning protection, include the earth connection that erects the overhead ground wire on the tower pole and be used for above overhead ground wire ground connection, the earth connection includes the metal garter spring and connects the connecting wire of overhead ground wire and metal garter spring, the many piece branch earth connections of metal garter spring on being annular hoop and being fixed in the hoop. The utility model discloses simple structure, it is convenient to implement, is convenient for obtain overhead ground wire and the less resistivity of the earth, can effectively reduce the lightning trip -out rate of current electric wire netting or reduce the possibility that the thunderbolt was suffered to the power transmission line.

Description

Electric power lightning protection electric resistance reducing grounding system
Technical field
The utility model relates to electric power conveying thunder resisting equipment field, particularly relates to a kind of electric power lightning protection electric resistance reducing grounding system.
Background technology
Thundercloud discharge causes Lightning Over-voltage in electric power system, or claims atmospheric over-voltage.Overvoltage common in overhead transmission line has two kinds: the first is that thunderbolt occurs near overhead wire, by the overvoltage of electromagnetic induction on power transmission line; The second is that thunder and lightning directly impacts and having the overvoltage that lightning conducter or wire produce.Concrete condition has three kinds: 1), thunderbolt head of mast; 2), be struck by lightning lightning conducter middle body; 3), walk around lightning conducter to impact in lead body.1), can recover lightning fault is divided into again two kinds by character: after-lightning stroke flashover occurs, and because air insulation intensity is recovered, reclosing drops into successfully; 2), the catastrophe failure such as permanent-Yin insulator comes off, wire fracture occurs, and reclosing drops into unsuccessfully.Thunder and lightning strike can bring multi-form damage and fracture to electric power facility, as follows: 1), be struck by lightning and cause overvoltage, all may cause damage to insulator, power transmission line, therefore generally can cause reclosing protection act.2) thunderbolt can cause insulator arc-over to discharge, and causes burn to come off to porcelain surface; Pattern cracking is caused to glass insulator; Melting trace etc. is caused to ironware, dielectric strength all will be made significantly to reduce.3), thunder and lightning impact on power transmission line or lightning conducter, disconnected stock may be caused even to rupture, transmission of electricity work cannot be carried out.4), thunder and lightning impact by the cement shaft tower of inner-core ground connection time, strong lightning current likely causes the body of rod to burst, and causes major network tripping operation etc.More than damage, or cause protection act, or out of service, so harm is very large.
Thunder and lightning is the key factor affecting power transmission line safety, occupies the first place of line fault tripping operation for a long time.Thunder and lightning is the natural process of atmospheric events, also uncontrollable so far.But we can by analyzing normal accident of sending out, and find thunderbolt rule, strengthen to guard against, this can accomplish.The emphasis record of subjecting to be struck by lightning is as follows: 1), be in the shaft tower of the upper level that lofty mountains and steep hills or summit; 2) transmission line of pool, near reservoir, is in; 3), long span transmission line structure, as the shaft tower on the mountain ridge or rivers and lakes of crossing over more than 800 meters; 4), the high shaft tower of earth resistance is arranged on, as rock column foot and power transmission line etc.The power transmission line in above place is appointed and is so easily struck by lightning, and appointing is so that electric power facility is impaired the most serious, the place that trip-out rate is the highest.
Utility model content
Appointed by thunderbolt for transmission line in above-mentioned prior art is so the uncontrollable factor in position so far, appointing in electric power system so has subregion to be that electric power facility is impaired the most serious, the problem in the place that trip-out rate is the highest, the utility model provides a kind of electric power lightning protection electric resistance reducing grounding system.
For the problems referred to above, the electric power lightning protection electric resistance reducing grounding system that the utility model provides is achieved the goal by following technical essential: electric power lightning protection electric resistance reducing grounding system, comprise and be set up in the lightning conducter on tower bar and the earth connection for above ground wire grounding, described earth connection comprises metal hoop and connects the connecting line of lightning conducter and metal hoop, and described metal hoop comprises hoop in the form of a ring and is fixed on the Duo Gen branch earth connection on hoop.
Concrete, in above version, compared to traditional earth connection, metal hoop is provided in this structure, metal hoop comprises the version of hoop and branch's earth connection, and such hoop can be fixed on tower bar easily, like this, the connecting line of connection metal garter spring and lightning conducter, in use because the tie point position at its two ends is fixed, can effectively be avoided because tension stress causes the bad even earthing failure of ground wire grounding; Further, adopt the version that Duo Gen branch earth connection is set on hoop, be convenient to realize the less earth resistance of lightning conducter by the contact area that hoop, branch's earth connection and ground are larger, the version that branch's earth connection is in parallel each other simultaneously, compared to the form of a traditional employing earth connection, under less material usage, just can obtain the grounding resistance being less than 4 ohm.
Further technical scheme is:
To be connected with tower bar and tie point is convenient to the hoop structure form chosen in taper tower bar bottom as a kind of hoop of being convenient to, described hoop is anchor ear shape, described hoop comprises inc annular hoop body and is fixed on the connection support plate of annular hoop body openend, and described connection is propped up crab bolt and connected.
Can adapt to the tower bar beating diameter range interval for making described hoop, described annular hoop body is made up of multistage arc, and the two ends of every section of arc are provided with connection support plate.
There is good antiseptic power, simultaneously when completing hoop and being connected with tower bar as one, annular hoop body inner surface and tower bar can the versions of good fit, and described arc is thickness between the stainless-steel sheet arc of 3mm to 5mm, copper coin or zinc-plated arc.
Consolidate annular hoop body and tower bar stability maintenance as a kind of being convenient to, the version of annular hoop body to tower shank diameter accommodation can being increased to a certain extent simultaneously, described annular hoop body is the circular cone shape that two ends diameter does not wait, and the internal face of annular hoop body is also provided with concavo-convex microgroove.
Branch's ground configurations form that tower bar is fixed on the earth upward stability is conducive to as a kind of, described branch earth connection is the rigid metal conductor being provided with segmental arc, and branch's earth connection is uniform in the form of a ring on hoop, the free end of branch's earth connection is divergent shape relative to hoop.
The utility model has following beneficial effect:
1, compared to traditional earth connection, metal hoop is provided in this structure, metal hoop comprises the version of hoop and branch's earth connection, such hoop can be fixed on tower bar easily, like this, the connecting line of connection metal garter spring and lightning conducter, in use because the tie point position at its two ends is fixed, can effectively be avoided because tension stress causes the bad even earthing failure of ground wire grounding.
2, further, adopt the version that Duo Gen branch earth connection is set on hoop, be convenient to realize the less earth resistance of lightning conducter by the contact area that hoop, branch's earth connection and ground are larger, the version that branch's earth connection is in parallel each other simultaneously, compared to the form of a traditional employing earth connection, under less material usage, just can obtain the grounding resistance being less than 4 ohm.
Accompanying drawing explanation
Fig. 1 is that in prior art, power transmission line is taken shelter from the thunder structural representation;
Fig. 2 adopts in two lightning conducters, three transmission line structure forms in prior art, the relative position of lightning conducter and power transmission line and shielding angle schematic diagram, and in figure, a is shielding angle;
Fig. 3 is the structural representation of an electric power lightning protection electric resistance reducing grounding system described in the utility model specific embodiment;
Fig. 4 is in electric power lightning protection electric resistance reducing grounding system described in the utility model specific embodiment, the structural representation of metal hoop.
Label in figure represents respectively: 1, tower bar, and 2, power transmission line, 3, lightning conducter, 4, cross-arm, 5, connecting line, 6, hoop, 7, branch's earth connection.
Embodiment
Below in conjunction with embodiment, the utility model is described in further detail, but structure of the present utility model is not limited only to following examples.
Embodiment 1:
As shown in Figure 3 and Figure 4, electric power lightning protection electric resistance reducing grounding system, comprise and be set up in the lightning conducter 3 on tower bar 1 and the earth connection for above lightning conducter 3 ground connection, described earth connection comprises metal hoop and connects the connecting line 5 of lightning conducter 3 and metal hoop, and described metal hoop comprises hoop 6 in the form of a ring and is fixed on the Duo Gen branch earth connection 7 on hoop 6.
Concrete, in above version, compared to traditional earth connection, metal hoop is provided in this structure, metal hoop comprises the version of hoop 6 and branch's earth connection 7, and such hoop 6 can be fixed on tower bar 1 easily, like this, the connecting line 5 of connection metal garter spring and lightning conducter 3, in use because the tie point position at its two ends is fixed, can effectively be avoided because tension stress causes lightning conducter 3 imperfect earth even earthing failure, further, adopt the version that Duo Gen branch earth connection 7 is set on hoop 6, be convenient to by hoop 6, the contact area that branch's earth connection 7 is larger with ground realizes the less earth resistance of lightning conducter 3, the version that branch's earth connection 7 is in parallel each other simultaneously, compared to the form of a traditional employing earth connection, just the grounding resistance being less than 4 ohm can be obtained under less material usage, in the present embodiment, be positioned on the cross-arm 4 of tower bar 1 by the upper end of connecting line 5 is connected to, the version that hoop 6 is fixed in the lower end of connecting line 5 is realized, above version is convenient to avoid the utility model in use connecting line 5 to produce tension stress.
Embodiment 2:
As shown in Figure 3 and Figure 4, the present embodiment is further qualified on the basis of embodiment 1: to be connected with tower bar 1 and tie point is convenient to hoop 6 version chosen in taper tower bar 1 bottom as a kind of hoop 6 of being convenient to, described hoop 6 is in anchor ear shape, described hoop 6 comprises inc annular hoop body and is fixed on the connection support plate of annular hoop body openend, and described connection is propped up crab bolt and connected.
For the tower bar 1 making described hoop 6 can adapt to beat diameter range interval, described annular hoop body is made up of multistage arc, and the two ends of every section of arc are provided with connection support plate.
There is good antiseptic power, simultaneously when completing hoop 6 and being connected with tower bar 1 as one, annular hoop body inner surface and tower bar 1 can the versions of good fit, and described arc is thickness between the stainless-steel sheet arc of 3mm to 5mm, copper coin or zinc-plated arc.
Consolidate annular hoop body and tower bar 1 stability maintenance as a kind of being convenient to, the version of annular hoop body to tower bar 1 diameter accommodation can being increased to a certain extent simultaneously, described annular hoop body is the circular cone shape that two ends diameter does not wait, and the internal face of annular hoop body is also provided with concavo-convex microgroove.
Branch's ground configurations form that tower bar 1 is fixed on the earth upward stability is conducive to as a kind of, described branch earth connection 7 is the rigid metal conductor being provided with segmental arc, and branch's earth connection 7 is uniform in the form of a ring on hoop 6, the free end of branch's earth connection 7 is divergent shape relative to hoop 6.
Embodiment 3:
The utility model additionally provides a kind of concrete electric power lightning protection electric resistance reducing grounding system concrete form, this embodiment is the three phase transmission line 2 of 20kV for voltage, tower bar 1 is highly 20 meters, three lightning conducters 3 arranged in parallel with three power transmission lines 2 above, and the spacing of the lightning conducter 3 be connected is 5.5 meters, lightning conducter 3 and power transmission line 2 vertical height are 5.5 meters, and the wire spacing of power transmission line 2 is 5 meters, and the power transmission line 2 of centre is positioned at immediately below middle lightning conducter 3.
Present embodiment discloses a kind of concrete structure of metal hoop simultaneously, wherein, branch's earth connection 7 by diameter be 20mm, to be that copper rod one end of 800-1000mm is bending form length, the curved side of above copper rod is free end, the other end of copper rod is fixed on hoop 6, the free end of copper rod is outside divergent shape relative to hoop 6, and the free end of copper rod is relative to the overhanging 300mm of hoop 6, hoop 6 be connected support plate and all adopt thickness to be that the corrosion resistant plate manufacture of 5mm forms, and hoop 6 is inc circulus; For adapting to the cement tower bar 1 of existing extensive employing, or the cement pedestal of steel tower, the internal diameter of hoop 6 gets 400mm, highly get 80mm, the openend of hoop 6 is the wide opening of 40mm in addition, and the size dimension connecting support plate is 80mm*50mm, connects support plate and adopts diameter to be that the stainless steel bolt of 10mm is connected.
Above content is the further description done the utility model in conjunction with concrete preferred implementation, can not assert that embodiment of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, not departing from other execution modes drawn under the technical solution of the utility model, all should be included in protection range of the present utility model.

Claims (6)

1. electric power lightning protection electric resistance reducing grounding system, comprise and be set up in the lightning conducter (3) on tower bar (1) and the earth connection for above lightning conducter (3) ground connection, it is characterized in that, described earth connection comprises metal hoop and connects the connecting line (5) of lightning conducter (3) and metal hoop, Duo Gen branch earth connection (7) that described metal hoop comprises hoop (6) in the form of a ring and is fixed on hoop (6).
2. electric power lightning protection electric resistance reducing grounding system according to claim 1, it is characterized in that, described hoop (6) is in anchor ear shape, and described hoop (6) comprises inc annular hoop body and is fixed on the connection support plate of annular hoop body openend, and described connection is propped up crab bolt and connected.
3. electric power lightning protection electric resistance reducing grounding system according to claim 2, it is characterized in that, described annular hoop body is made up of multistage arc, and the two ends of every section of arc are provided with connection support plate.
4. electric power lightning protection electric resistance reducing grounding system according to claim 3, is characterized in that, described arc is thickness between the stainless-steel sheet arc of 3mm to 5mm, copper coin or zinc-plated arc.
5. electric power lightning protection electric resistance reducing grounding system according to claim 2, is characterized in that, the circular cone shape that described hoop (6) does not wait in two ends diameter, and the internal face of hoop (6) is also provided with concavo-convex microgroove.
6. electric power lightning protection electric resistance reducing grounding system according to claim 1, it is characterized in that, described branch earth connection (7) is the rigid metal conductor being provided with segmental arc, and branch's earth connection (7) is uniform in the form of a ring on hoop (6), the free end of branch's earth connection (7) relative to hoop (6) in divergent shape.
CN201521020917.4U 2015-12-10 2015-12-10 Ground connection system that hinders falls in electric power lightning protection Active CN205160010U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201521020917.4U CN205160010U (en) 2015-12-10 2015-12-10 Ground connection system that hinders falls in electric power lightning protection

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Application Number Priority Date Filing Date Title
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Publication Number Publication Date
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105826704A (en) * 2016-05-13 2016-08-03 国网四川省电力公司电力科学研究院 Lightning-protection grounding resistance stabilizer
CN109347042A (en) * 2018-09-30 2019-02-15 国网浙江平阳县供电有限责任公司 The mounting structure and installation method of ground wire are protected on a kind of straight line pole
CN109473936A (en) * 2018-09-30 2019-03-15 国网浙江平阳县供电有限责任公司 The mounting structure and installation method of ground wire are protected on a kind of terminal pole

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105826704A (en) * 2016-05-13 2016-08-03 国网四川省电力公司电力科学研究院 Lightning-protection grounding resistance stabilizer
CN109347042A (en) * 2018-09-30 2019-02-15 国网浙江平阳县供电有限责任公司 The mounting structure and installation method of ground wire are protected on a kind of straight line pole
CN109473936A (en) * 2018-09-30 2019-03-15 国网浙江平阳县供电有限责任公司 The mounting structure and installation method of ground wire are protected on a kind of terminal pole

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