CN205406957U - Circuit overvoltage protection device - Google Patents
Circuit overvoltage protection device Download PDFInfo
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- CN205406957U CN205406957U CN201620191516.3U CN201620191516U CN205406957U CN 205406957 U CN205406957 U CN 205406957U CN 201620191516 U CN201620191516 U CN 201620191516U CN 205406957 U CN205406957 U CN 205406957U
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Abstract
The utility model provides a circuit overvoltage protection device, including organic compound insulator, arrester, electrode group and support, organic compound insulator upper end is used for fixed insulated wire, the electrode group includes two electrodes, one of them electrode with the upper end of organic compound insulator links to each other, another electrode with the upper end of arrester links to each other, and two air gap has between the electrode, the lower extreme of arrester passes through the support links to each other with the lower extreme of organic compound insulator, wherein, the electrode is the V -arrangement, and the first side lever of each electrode and the contained angle between the second side lever are 50~75, just minimum distance between two electrodes of electrode group is 20~16 millimeters. The utility model discloses circuit overvoltage protection device has been owing to set up air gap, and transmission line is last can to apply the running voltage for a long time and do not puncture, and is punctured when being produced instantaneous high voltage by the thunderbolt and channel into ground with instantaneous current, has solved transmission line easily by lightning -caused breaking's problem.
Description
Technical field
This utility model relates to high voltage supply field, exchanges overhead transmission line overvoltage protection particularly to one.
Background technology
In recent years, in order to reduce the overhead distribution fault that the external causes such as trees, bird pest, sleet cause, improve power supply reliability, reduce line corridor, a large amount of insulated conductors in electric distribution network overhead wire both domestic and external, but the problem that suspended insulated guide wire breaks because of thunderbolt is very prominent, and increases along with insulated conductor line length and steeply rise, it has also become the subject matter of serious threat distribution network line safe operation.The reason of insulated conductor breakage caused by lightning stroke: suspended insulated guide wire voltage in lightning stroke process causes flashover, the electric current of moment electric arc is very big but the time is very short.Blow hole can be formed on suspended insulated guide wire insulating barrier, wire will not be blown, but, this lightning surge causes flashover, the particularly flashover between biphase or three-phase (being not necessarily on same bar, tower), metallic short circuit passage can be formed, cause kilo-ampere power frequency continued flow, arc energy is by abruptly increase, now, owing to suspended insulated guide wire insulating barrier hinders electric arc at its surface sliding, the tension force of wire in addition, high temperature arc root is fixed on the breakdown point of insulating barrier thus blowing wire before breaker actuation.Therefore lightning-caused breaking problem how is properly settled, it is ensured that the safe operation of power distribution network has become as a major issue very in the urgent need to address.
Utility model content
Based on the problems referred to above, this utility model provides a kind of line overvoltage protection device, it is possible to the insulation of protection power circuit is from the infringement of lightning surge effectively.
nullA kind of line overvoltage protection device for transmission tower，Wherein，Described transmission tower includes the organic composite insulator for fixed insulation wire，It is characterized in that，Described line overvoltage protection device includes spark gap、Electrode group and support，Described electrode group includes being rendered as the first electrode of V-shaped and being rendered as the second electrode of V-shaped，Wherein，The lower terminals of described spark gap are used for ground connection，And be connected with the leftover bits and pieces of described organic composite insulator by described support，First side lever of described first electrode is connected with the upper cervical region of described organic composite insulator，And described first side lever of the second electrode is connected with the upper terminals of described spark gap, described first electrode and the second electrode are separated at intervals，Angle between first side lever and its second side lever of described first electrode is 50 °～75 °，Described second electrode the first side lever and its second side lever between angle be 50 °～75 °.
Further, described first electrode and the second electrode are positioned at same perpendicular, and about the center line specular between described first electrode and the second electrode.
Further, the minimum spacing between the second side lever and second side lever of the second electrode of described first electrode is 20～16 millimeters.
Further, the top of the second side lever of described first electrode is most advanced and sophisticated, and the top of the second side lever of described second electrode is most advanced and sophisticated.
Further, the first side lever of described first electrode is connected with the upper cervical region of described organic composite insulator by pipe clamp, and the first side lever of described second electrode is connected with the upper terminals of described spark gap by bolt.
Further, described spark gap is Zinc-Oxide Arrester.
Further, the overcoat of described Zinc-Oxide Arrester has 4 umbrella-shaped structures.
Further, described support includes the conduction bent plate that the ground connection cross-arm with described transmission tower is connected.
Further, the material of described electrode group is conducting metal.
Further, the upper cervical region of described organic composite insulator is provided with binding apparatus, and described binding apparatus is used for fixed insulation wire.
The line overvoltage protection device that this utility model provides ensure that insulated conductor is not connected with the first electrode when normal transmission; gap between first electrode and the second electrode can ensure that spark gap does not carry power frequency operation voltage when insulated conductor normal transmission simultaneously; so can be prevented effectively from the problem of aging that spark gap occurs at During Process of Long-term Operation, thus the service life of spark gap is significantly increased.When insulated conductor is struck by lightning, voltage on insulated conductor increases sharply, puncture the insulation sheath adjacent with the first electrode of insulated conductor, insulated conductor and the first electrode is forced to be connected, the high pressure on insulated conductor is made to be applied between the first electrode and the second electrode, and promote between the first electrode and the second electrode breakdown, thus the lightning current on insulated conductor is transferred to spark gap, spark gap now presents Low ESR, this lightning current is released into ground, avoid insulated conductor because of power frequency arc electric current long time calcination and break, thus just the insulated conductor in electrical network can be served protective effect.Wherein, minimum spacing between second side lever and second side lever of the second electrode of the first electrode is 20～16 millimeters, such setting can ensure that the air between the first electrode and the second electrode is not breakdown when insulated conductor normal transmission, and breakdown after thunderbolt insulated conductor.First electrode of V-shaped and the second electrode are for elongating gradually and extinguishing the electric arc between two electrodes, to ensure the safety of each electrode.
The simple in construction of the line overvoltage protection device that this utility model provides, easy to manufacture, safe and reliable, it is simple to practice and extension is applied.
Accompanying drawing explanation
Fig. 1 is the structural representation of the line overvoltage protection device for transmission tower of this utility model embodiment.
Detailed description of the invention
Below in conjunction with accompanying drawing, the embodiment of technical solutions of the utility model is described in detail.Following example are only for clearly illustrating therefore to be only used as the technical solution of the utility model example, and can not limit protection domain of the present utility model with this.
Fig. 1 shows the line overvoltage protection device for transmission tower of this utility model embodiment.Wherein, transmission tower be broadly interpreted be include electric pole or shaft tower etc. establish in ground and device for transmitting electricity.This line overvoltage protection device includes organic composite insulator 1, spark gap 2, electrode group 3 and support 4.nullOrganic composite insulator 1 is for supporting the insulated conductor of transmission line of electricity，Described electrode group 3 includes the first electrode 31 being rendered as V-shaped and the second electrode 32 being rendered as V-shaped，First electrode 31 has the first side lever and together forms the second side lever of V-shaped with the first side lever，Same second electrode 32 has the first side lever and together forms the second side lever of V-shaped with the first side lever，Wherein，First side lever of the first electrode 31 is connected with the upper cervical region 101 (such as chapeau de fer) of described organic composite insulator 1，First side lever of the second electrode 32 is connected with the upper terminals 201 of described spark gap 2，And first electrode 31 and the second electrode 32 be separated at intervals，To form the air gap between，The lower terminals 202 of described spark gap 2 are for ground connection，And be connected with the leftover bits and pieces 102 (such as steel foot) of described organic composite insulator 1 by support 4.In electrode group, the material of the first electrode 31 and the second electrode 32 is all chosen as conducting metal, but is preferably copper and aluminum and alloy etc. thereof, in order to it has high conductivity, high intensity, the advantage such as ageing-resistant.Further, the first side lever of the first electrode 31 is connected with the upper cervical region 101 of organic composite insulator preferably by pipe clamp, adopts bolt fixed mode.First side lever of described second electrode 32 is connected with the upper terminals 201 of described spark gap 2 by bolt.
Support 4 of the present utility model includes the conduction bent plate that the ground connection cross-arm with described transmission tower is connected.But a part for conduction bent plate cross-arm.Cross-arm is ingredient important in shaft tower, and it is used to install the electric power tools such as insulator, to support wire, lightning conducter, and so as to keeps certain safe distance by regulation.Angle steel is one of the material making cross-arm, selects angle steel to make the bearing capacity of cross-arm structure higher, is not easy corrosion simultaneously.Wherein, this organic composite insulator 1, for fixed insulation wire, adopts organic combined insulated material to make insulator, has the advantages such as volume is little, lightweight, be easy to maintenance, install, mechanical strength is high, not broken, anti-seismic performance is excellent, anti-pollution characteristic is good.
This organic composite insulator 1 upper end arranges fixing device, and fixing device for being fixed on organic composite insulator 1 by insulated conductor.This fixing device can adopt binding apparatus 5, clamping and sleeve etc., but preferably employs the mode that aluminum steel is tied up, and aluminum steel ductility is prone to tie up well, and resistance to expose to wind and rain and be unlikely to be lighted by high temperature or melted when thunderbolt.
The line overvoltage protection device that this utility model provides ensure that insulated conductor is not connected with the first electrode when normal transmission; gap between first electrode and the second electrode can ensure that spark gap does not carry power frequency operation voltage when insulated conductor normal transmission simultaneously; so can be prevented effectively from the problem of aging that spark gap occurs at During Process of Long-term Operation, thus the service life of spark gap is significantly increased.When insulated conductor is struck by lightning, voltage on insulated conductor increases sharply, puncture the insulation sheath adjacent with the first electrode of insulated conductor, insulated conductor and the first electrode is forced to be connected, the high pressure on insulated conductor is made to be applied between the first electrode and the second electrode, and promote between the first electrode and the second electrode breakdown, thus the lightning current on insulated conductor is transferred to spark gap, spark gap now presents Low ESR, this lightning current is released into ground, avoid insulated conductor because of power frequency arc electric current long time calcination and break, thus just the insulated conductor in electrical network can be served protective effect.Wherein, minimum spacing between second side lever and second side lever of the second electrode of the first electrode is 20～16 millimeters, such setting can ensure that the air between the first electrode and the second electrode is not breakdown when insulated conductor normal transmission, and breakdown after thunderbolt insulated conductor.First electrode of V-shaped and the second electrode are for elongating gradually and eliminating the electric arc between two electrodes, to ensure the safety of each electrode.
Owing to being provided with the air gap between the first electrode 31 and the second electrode 32, working voltage is carried on the air gap at ordinary times, therefore working voltage can apply for a long time and not puncture, namely spark gap 2 does not carry power frequency operation voltage under normal circumstances, spark gap 2 is absent from running problem of aging, can life-time service, even if simultaneously causing spark gap 2 to puncture for a certain reason or short circuit, without causing transmission line wire to be directly grounded, and it is properly functioning to affect circuit.When the gap of electrode group 3 is by sleet and foreign object short circuit, spark gap about 2 two ends are loaded the high voltage of transmission line of electricity, but now spark gap is in high impedance status, the existence of spark gap 2 makes transmission line of electricity can meet its long-term charging operation, thus realizing dual fail-safe.Owing to the lightning impulse volt-second characteristic curve of spark gap 2 is lower by more than 15% than protected line insulator lightning impulse volt-second characteristic curve.When insulated conductor is struck by lightning; there is lightning surge in transmission line of electricity; the insulating barrier of insulated conductor breaks; voltage-drop loading on wire is between electrode group 3; meanwhile under the lightning surge effect that direct lightning strike or induced lightening produce, the air gap elder generation disruptive discharge between the first electrode 31 of this utility model line overvoltage protection device and the second electrode 32, owing to the instantaneous voltage of thunderbolt is significantly high; spark gap 2 presents Low ESR, is released by lightning current into ground；Non-linear impedance characteristic due to spark gap 2 excellence, the pressure drop (being called residual voltage) produced on spark gap 2 will be limited, spark gap 2 residual voltage is lower than 50% discharge voltage of insulator 1, even if lightning current has bigger increase, the residual voltage of spark gap 2 only has increased slightly, and electric discharge flashover still will not occur insulator 1.After lightning current; the power frequency arc electric current (being called power frequency continued flow) produced due to line system voltage in gap will flow through spark gap 2; again due to the excellent nonlinear characteristic of Zinc-Oxide Arrester 2; it is now in high impedance status; the power frequency continued flow flowing through spark gap 2 is only milliampere level, and the insulated conductor in electrical network is served the effect of being effectively protected.
As it is shown in figure 1, the minimum spacing between described V-arrangement the first electrode 31 and the second side lever of the second electrode 32 is preferably 20 and 16 millimeters.Such setting can ensure that the air between the first electrode and the second electrode is not breakdown when insulated conductor normal transmission, and breakdown after thunderbolt insulated conductor.In order to improve the effect of arc extinguishing, described first electrode 31 and the second electrode 32 are positioned at same perpendicular, and about the center line specular between described first electrode 31 and the second electrode 32.Experiments verify that, when the angular range between described V-arrangement the first electrode 31 and the first side lever and second side lever of the second electrode 32 is between 50 °～75 °, the arc quenching effect of electric arc is best, it is thus preferred to angular range is 50 °～75 °.Further, the top of the second side lever of described first electrode 31 is most advanced and sophisticated, and the top of the second side lever of described second electrode 32 also be most advanced and sophisticated, thunderbolt voltage height to a certain extent time, electric arc elongates eletrode tip and is more beneficial for gathering the release of electromotive force.
Further, spark gap 2 is preferably Zinc-Oxide Arrester, (namely less than predetermined pressure sensitive voltage), varistor value is very big under normal running voltage for zinc oxide material, be equivalent to state of insulation, but under Impulse Voltage (pressure sensitive voltage more than predetermined), varistor is that low value is breakdown, is equivalent to short-circuit condition.But after varistor hit, state of insulation can be recovered；After cancelling higher than the voltage of pressure sensitive voltage, it has recovered again high-impedance state.Therefore, after Zinc-Oxide Arrester installed by electric lines of force, when thunderbolt; the transient high voltage that thunderbolt produces makes varistor puncture; lightning current flows into the earth by varistor, it is possible to by the Control of Voltage on power line in safety range, thus protecting the safety of electrical equipment.The lower terminals 202 of described spark gap 2 are earth terminal, for being discharged by high-tension current when spark gap 2 is breakdown.
Further, described spark gap is organic combined insulated coat lightning arrester, it is possible to spark gap 2 is played a very good protection, shockproof, is not easily collided with.Further, spark gap 2 of the present utility model and organic composite insulator 1 all preferably employ 4 umbrella-shaped structures, and 4 umbrella-shaped structures can increase spark gap and organic composite insulator surface creepage distance, and then improves the class of insulation.
Above example only in order to the technical solution of the utility model to be described, is not intended to limit；Although this utility model being described in detail with reference to previous embodiment, it will be understood by those within the art that: the technical scheme described in previous embodiment still can be modified by it, or wherein some or all of technical characteristic is carried out equivalent replacement；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of this utility model embodiment technical scheme, it all should be encompassed in the middle of the scope of claim of the present utility model and description.
Claims (10)
- null1. the line overvoltage protection device for transmission tower，Wherein，Described transmission tower includes the organic composite insulator for fixed insulation wire，It is characterized in that，Described line overvoltage protection device includes spark gap、Electrode group and support，Wherein said electrode group includes being rendered as the first electrode of V-shaped and being rendered as the second electrode of V-shaped，The lower terminals of described spark gap are used for ground connection，And be connected with the leftover bits and pieces of described organic composite insulator by described support，First side lever of described first electrode is connected with the upper cervical region of described organic composite insulator，And described first side lever of the second electrode is connected with the upper terminals of described spark gap，Described first electrode and the second electrode are separated at intervals，Angle between first side lever and its second side lever of described first electrode is 50 °～75 °，Angle between first side lever and its second side lever of described second electrode is 50 °～75 °.
- 2. line overvoltage protection device according to claim 1, it is characterised in that described first electrode and the second electrode are positioned at same perpendicular, and about the center line specular between described first electrode and the second electrode.
- 3. line overvoltage protection device according to claim 2, it is characterised in that the minimum spacing between the second side lever and second side lever of the second electrode of described first electrode is 20～16 millimeters.
- 4. line overvoltage protection device according to claim 1 and 2, it is characterised in that the top of the second side lever of described first electrode is most advanced and sophisticated, the top of the second side lever of described second electrode is most advanced and sophisticated.
- 5. line overvoltage protection device according to any one of Claim 1-3; it is characterized in that; first side lever of described first electrode is connected with the upper cervical region of described organic composite insulator by pipe clamp, and the first side lever of described second electrode is connected with the upper terminals of described spark gap by bolt.
- 6. line overvoltage protection device according to any one of Claim 1-3, it is characterised in that described spark gap is Zinc-Oxide Arrester.
- 7. line overvoltage protection device according to claim 6, it is characterised in that the overcoat of described Zinc-Oxide Arrester has 4 umbrella-shaped structures.
- 8. line overvoltage protection device according to any one of Claim 1-3, it is characterised in that described support includes the conduction bent plate that the ground connection cross-arm with described transmission tower is connected.
- 9. the line overvoltage protection device according to any one of Claim 1-3, it is characterised in that the material of described electrode group is conducting metal.
- 10. line overvoltage protection device according to claim 1, it is characterised in that the upper cervical region of described organic composite insulator is provided with binding apparatus, described binding apparatus is used for fixed insulation wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620191516.3U CN205406957U (en) | 2016-03-12 | 2016-03-12 | Circuit overvoltage protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620191516.3U CN205406957U (en) | 2016-03-12 | 2016-03-12 | Circuit overvoltage protection device |
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| Publication Number | Publication Date |
|---|---|
| CN205406957U true CN205406957U (en) | 2016-07-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620191516.3U Active CN205406957U (en) | 2016-03-12 | 2016-03-12 | Circuit overvoltage protection device |
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| CN (1) | CN205406957U (en) |
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2016
- 2016-03-12 CN CN201620191516.3U patent/CN205406957U/en active Active
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