CN203423465U - Power distribution overhead power transmission line lightning-induced overvoltage lightning protection device - Google Patents

Power distribution overhead power transmission line lightning-induced overvoltage lightning protection device Download PDF

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Publication number
CN203423465U
CN203423465U CN201320508999.1U CN201320508999U CN203423465U CN 203423465 U CN203423465 U CN 203423465U CN 201320508999 U CN201320508999 U CN 201320508999U CN 203423465 U CN203423465 U CN 203423465U
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CN
China
Prior art keywords
insulator
arm
power transmission
ground wire
lightning
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Expired - Fee Related
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CN201320508999.1U
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Chinese (zh)
Inventor
黄志都
邓雨荣
朱时阳
俸波
王乐
黄维
田树军
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Electric Power Research Institute of Guangxi Power Grid Co Ltd
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Electric Power Research Institute of Guangxi Power Grid Co Ltd
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Priority to CN201320508999.1U priority Critical patent/CN203423465U/en
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Expired - Fee Related legal-status Critical Current
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Abstract

A power distribution overhead power transmission line lightning-induced overvoltage lightning protection device is provided. The power distribution overhead power transmission line lightning-induced overvoltage lightning protection device comprises towers, tower grounding resistors, grounding down-lead wires, power transmission conductors, power transmission conductor cross arms and line insulators; the power transmission conductor cross arms are mounted on the towers and are connected with the grounding down-lead wires; the grounding down-lead wires are connected with the tower grounding resistors; the power transmission conductors are connected with the power transmission conductor cross arms through the line insulators; ground wire cross arms are mounted below the power transmission conductor cross arms and are connected with the grounding down-lead wires; ground wires are connected with the ground wire cross arms; and the ground wires of all towers except a first base tower at an initial end of a line are fixed on the ground wire cross arms through insulators with parallel-connection gaps. With the power distribution overhead power transmission line lightning-induced overvoltage lightning protection device of the utility model adopted, lightning-induced overvoltage on a power transmission line can be effectively reduced, and the flashover probability of the line insulators can be decreased, and the lightning protection performance of the power distribution overhead power transmission line can be improved.

Description

A kind of distribution is maked somebody a mere figurehead power transmission line lightning shielding induction overvoltage lightning protection device
Technical field
The utility model relates to a kind of distribution overhead line lightning protection device, specifically a kind of to 35kV and the built on stilts power transmission line lightning shielding induction overvoltage lightning protection device of following electric pressure distribution.
Background technology
The power distribution network of 35kV and following electric pressure is to be directly the facility of users' power supply, has more than number of devices and the wide feature of Regional Distribution, and the chance of being therefore struck by lightning is more.Compare with 110kV and above transmission line, there is significant limitation in distribution line in lightning protection, and because its insulation level is low, not only direct lightning strike overvoltage can work the mischief, and thunder and lightning induction voltage also can work the mischief.When near circuit during thunderbolt, on distribution line, can exceed circuit phase voltage twice and above overvoltage because electromagnetic induction produces, line insulation is wrecked and cause accident.Because distribution line height is lower, near trees circuit, building are more, the probability that thunder and lightning is attacked circuit directly is less, near general thunderbolt circuit, trees, building or probability are greatly higher, and the experimental results shows that it is the main cause of 35kV and following electric pressure distribution overhead line lightning stroke trip that near the thunderbolt of circuit produces thunder and lightning induction voltage.Therefore, 35kV and the lightning protection of following electric pressure distribution overhead line focus on reducing thunder and lightning induction voltage.
At present, the protection for distribution overhead line thunder and lightning induction voltage comprises two aspects: from the angle of restriction thunder and lightning induction voltage, protect; From reducing the angle of thunder and lightning induction voltage, protect.What research was more both at home and abroad is to protect from the angle of restriction thunder and lightning induction voltage, and the safeguard procedures of employing comprise: lightning arrester, reinforcement line insulation, installing auto recloser etc. are installed.Specifically, in the lightning protection of the distribution overhead line of 35kV and following electric pressure, the major measure that leakage conductor has become restriction thunder and lightning induction voltage is installed, and brings into play certain effect.But that leakage conductor cost is installed is completely higher due to overhead transmission line, in lightning arrester running, failure rate is higher, has affected to a certain extent the popularization of this kind of Lighting Protection Measures.
Utility model content
Technical problem to be solved in the utility model is to provide the built on stilts power transmission line lightning shielding induction overvoltage lightning protection device of a kind of distribution; reduce 35kV and following electric pressure distribution overhead transmission line thunder and lightning induction voltage level, improve distribution overhead line lightning protection properties.
The utility model solves the problems of the technologies described above taked technical scheme: a kind of distribution is maked somebody a mere figurehead power transmission line lightning shielding induction overvoltage lightning protection device, comprise shaft tower, pole tower ground resistance, down conductor, transmission pressure, transmission pressure cross-arm and line insulator, transmission pressure cross-arm is arranged on shaft tower and with down conductor and is connected, down conductor and pole tower ground resistance, transmission pressure is connected with transmission pressure cross-arm by line insulator;
The built on stilts power transmission line lightning shielding induction overvoltage lightning protection device of described distribution also comprises ground wire cross-arm and ground wire; Ground wire cross-arm is arranged on the below of transmission pressure cross-arm and is connected with down conductor, and ground wire is connected with ground wire cross-arm, and except the head end first base shaft tower of circuit, the ground wire on other shaft towers is fixed on ground wire cross-arm by the insulator with parallel connection gaps.
The described insulator with parallel connection gaps comprises composite insulator and adjustable discharging gap, and adjustable discharging gap is in parallel with composite insulator; Insulator with parallel connection gaps is fixedly connected with ground wire with aluminium alloy clamp gold utensil by torque nut, by steel pin, is connected with ground wire cross-arm with hold-down nut.
Described adjustable discharging gap adopts a pair of spheric electrode, and its clearance distance is adjusted by rotating the bulb of an electrode, thereby realizes the adjusting of discharge voltage.
While being installed on 10kV distribution overhead line, ground wire cross-arm and shaft tower the transmission pressure cross-arm distance of below are 0.3-0.8m; Clearance distance with the adjustable discharging gap ball electrode of the insulator of parallel connection gaps is 2-3cm.
While being installed on 35kV distribution overhead line, ground wire cross-arm and shaft tower the transmission pressure cross-arm distance of below are 1.0-1.5m; Clearance distance with the adjustable discharging gap ball electrode of the insulator of parallel connection gaps is 4-6cm.
Described line insulator is suspension insulator, pin insulator or insulator crossarm; Shaft tower is cement shaft tower, steel tower or steel tube tower.
Described ground wire is steel strand wire, pole tower ground resistance≤10 Ω.
The beneficial effect that the utility model can obtain is:
(1) below transmission pressure cross-arm, set up ground wire cross-arm, ground wire is fixed on ground wire cross-arm by the insulator with parallel connection gaps, and ground wire is taked steel strand wire, single-point grounding, in the time of can effectively reducing transmission line operation, because forming circulation on steel strand wire, electromagnetic induction causes electric energy loss.
(2) the utility model is installed on to three phase line below, transmission line of lightning strike nearby buildings, trees or greatly time, on steel strand wire, produce lightning induced voltage, under the effect of this voltage, insulator gap discharge with parallel connection gaps, steel strand wire are connected with the earth by each base shaft tower or tower grounding downlead, and steel strand wire current potential is zero, becomes ground wire.Due to the coupling of ground wire and transmission pressure, at transmission pressure, produce Coupling Potential, can effectively reduce the thunder and lightning induction voltage on transmission pressure, reduce line insulator probability of flashover, improve distribution overhead line lightning protection properties.
(3) the utility model not only can be applied in the lightning protection of newly-built distribution overhead transmission line, also can be used in the Lightning Transformation of built circuit.
Accompanying drawing explanation
Fig. 1 is the structural representation of the built on stilts power transmission line lightning shielding induction overvoltage lightning protection device of distribution described in the utility model.
Fig. 2 is the insulator structure schematic diagram with parallel connection gaps described in the utility model.
In figure, be labeled as: 1, line insulator, 2, ground wire, 3, down conductor, 4, shaft tower, 5, transmission pressure, 6, pole tower ground resistance, 7, with the insulator of parallel connection gaps, 8, transmission pressure cross-arm, 9, ground wire cross-arm, 10, torque nut, 11, aluminium alloy clamp gold utensil, 12, composite insulator, 13, steel pin, 14, hold-down nut, 15, adjustable discharging gap.
Embodiment
Below in conjunction with the drawings and the specific embodiments, the utility model is described in further detail.
As shown in Figure 1, ground wire 2 is arranged on transmission pressure 5 belows, transmission pressure 5 is connected with transmission pressure cross-arm 8 by line insulator 1, and ground wire 2 is connected with ground wire cross-arm 9 by the insulator 7 with parallel connection gaps, and transmission pressure cross-arm 8 is connected with down conductor 3 with ground wire cross-arm 9; Down conductor 3 is connected with pole tower ground resistance 6; Ground wire 2 adopts steel strand wire, resistance value≤10 Ω of pole tower ground resistance 6.
As shown in Figure 2, by torque nut 10 and aluminium alloy clamp gold utensil 11, the ground wire in Fig. 12 is fixing with the insulator 7 of parallel connection gaps, with the insulator 7 of parallel connection gaps, by steel pin 13, be connected with the ground wire cross-arm 9 in Fig. 1 with hold-down nut 14.Composite insulator 12 is realized ground wire 2 insulation against ground and fixed support effect.Adjustable discharging gap 15 adopts a pair of spheric electrode, can reduce the dispersiveness of discharge voltage, and clearance distance can adjust by rotating the bulb of an electrode, thereby realizes the adjusting of discharge voltage.Adjustable discharging gap 15 is in parallel with composite insulator 12.
When ground wire 2 is installed, should guarantee single-point grounding, at circuit head end the first base shaft tower 4 places, ground wire 2 is directly connected with ground wire cross-arm 9, and is connected with pole tower ground resistance 6 by down conductor 3; Other shaft tower 4 places, ground wire 2 is all fixing by the insulator 7 with parallel connection gaps, and is connected with ground wire cross-arm 9.If circuit is longer, circuit can be carried out to segmentation, every 1km is one section, at every section of circuit head end, the direct ground connection of ground wire 2, fixing by the insulator 7 with parallel connection gaps at other shaft tower 4 places of every section of circuit.
For 10kV distribution overhead line, if transmission pressure 5 adopts steel reinforced aluminium conductors (plain conductor), ground wire cross-arm 9 and shaft tower 4 transmission pressure cross-arm 8 distances of below be 0.3-0.8m.Ground wire 2 is nearer with transmission pressure 5 spacings, and coupling effect is better, is more conducive to line thunder protection protection.Clearance distance with the adjustable discharging gap 15 ball electrodes of the insulator 7 of parallel connection gaps is adjusted to 2-3cm.
For 35kV distribution overhead line, ground wire cross-arm 9 and shaft tower 4 transmission pressure cross-arm 8 distances of below are 1.0-1.5m.Clearance distance with the adjustable discharging gap 15 ball electrodes of the insulator 7 of parallel connection gaps is adjusted to 4-6cm.

Claims (7)

1. a distribution is maked somebody a mere figurehead power transmission line lightning shielding induction overvoltage lightning protection device, comprise shaft tower, pole tower ground resistance, down conductor, transmission pressure, transmission pressure cross-arm and line insulator, transmission pressure cross-arm is arranged on shaft tower and with down conductor and is connected, down conductor and pole tower ground resistance, transmission pressure is connected with transmission pressure cross-arm by line insulator; It is characterized in that, the below of transmission pressure cross-arm is provided with ground wire cross-arm, and ground wire cross-arm is connected with ground wire with down conductor, and except the head end first base shaft tower of circuit, the ground wire on other shaft towers is fixed on ground wire cross-arm by the insulator with parallel connection gaps.
2. the built on stilts power transmission line lightning shielding induction overvoltage lightning protection device of distribution according to claim 1, is characterized in that, the described insulator with parallel connection gaps comprises composite insulator and adjustable discharging gap, and adjustable discharging gap is in parallel with composite insulator; Insulator with parallel connection gaps is fixedly connected with ground wire with aluminium alloy clamp gold utensil by torque nut, by steel pin, is connected with ground wire cross-arm with hold-down nut.
3. distribution according to claim 2 is maked somebody a mere figurehead power transmission line lightning shielding induction overvoltage lightning protection device; it is characterized in that; described adjustable discharging gap adopts a pair of spheric electrode, and its clearance distance is adjusted by rotating the bulb of an electrode, thereby realizes the adjusting of discharge voltage.
4. the built on stilts power transmission line lightning shielding induction overvoltage lightning protection device of distribution according to claim 3, is characterized in that, while being installed on 10kV distribution overhead line, ground wire cross-arm and shaft tower the transmission pressure cross-arm of below apart from being 0.3-0.8m; Clearance distance with the adjustable discharging gap ball electrode of the insulator of parallel connection gaps is 2-3cm.
5. the built on stilts power transmission line lightning shielding induction overvoltage lightning protection device of distribution according to claim 3, is characterized in that, while being installed on 35kV distribution overhead line, ground wire cross-arm and shaft tower the transmission pressure cross-arm of below apart from being 1.0-1.5m; Clearance distance with the adjustable discharging gap ball electrode of the insulator of parallel connection gaps is 4-6cm.
6. according to the built on stilts power transmission line lightning shielding induction overvoltage lightning protection device of the distribution described in claim 1-5 any one, it is characterized in that, described ground wire is steel strand wire, pole tower ground resistance≤10 Ω.
7. the built on stilts power transmission line lightning shielding induction overvoltage lightning protection device of distribution according to claim 6, is characterized in that, described line insulator is suspension insulator, pin insulator or insulator crossarm; Shaft tower is cement shaft tower, steel tower or steel tube tower.
CN201320508999.1U 2013-08-20 2013-08-20 Power distribution overhead power transmission line lightning-induced overvoltage lightning protection device Expired - Fee Related CN203423465U (en)

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Application Number Priority Date Filing Date Title
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105098694A (en) * 2015-08-24 2015-11-25 国网天津静海供电有限公司 Overhead lightning line erection method based on typical design of power distribution network
CN105529664A (en) * 2016-01-28 2016-04-27 国网山西省电力公司临汾供电公司 Lightning protection system for high-voltage line
CN109358272A (en) * 2018-11-12 2019-02-19 陕西赛普瑞电气有限公司 A kind of intelligent lightning protecting overvoltage protection of distribution automation
CN109387745A (en) * 2018-12-21 2019-02-26 云南电网有限责任公司电力科学研究院 A kind of power distribution network over-voltage sensing device
CN110445082A (en) * 2019-08-20 2019-11-12 长沙理工大学 The single-phase mounting structure and its test method of the parallel connection gaps of 10kV distribution line
CN110535089A (en) * 2019-10-11 2019-12-03 云南电网有限责任公司电力科学研究院 Power distribution network lightning conducter indirect earthed laying method and device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105098694A (en) * 2015-08-24 2015-11-25 国网天津静海供电有限公司 Overhead lightning line erection method based on typical design of power distribution network
CN105529664A (en) * 2016-01-28 2016-04-27 国网山西省电力公司临汾供电公司 Lightning protection system for high-voltage line
CN109358272A (en) * 2018-11-12 2019-02-19 陕西赛普瑞电气有限公司 A kind of intelligent lightning protecting overvoltage protection of distribution automation
CN109387745A (en) * 2018-12-21 2019-02-26 云南电网有限责任公司电力科学研究院 A kind of power distribution network over-voltage sensing device
CN109387745B (en) * 2018-12-21 2020-06-05 云南电网有限责任公司电力科学研究院 Overvoltage sensing device for power distribution network
CN110445082A (en) * 2019-08-20 2019-11-12 长沙理工大学 The single-phase mounting structure and its test method of the parallel connection gaps of 10kV distribution line
CN110445082B (en) * 2019-08-20 2020-12-01 长沙理工大学 Single-phase installation structure of parallel gap of 10kV distribution line and test method thereof
CN110535089A (en) * 2019-10-11 2019-12-03 云南电网有限责任公司电力科学研究院 Power distribution network lightning conducter indirect earthed laying method and device

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Granted publication date: 20140205

Termination date: 20140820