CN203119291U - Water type arc extinguishing clearance protection device for middle/low voltage distribution network - Google Patents
Water type arc extinguishing clearance protection device for middle/low voltage distribution network Download PDFInfo
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- CN203119291U CN203119291U CN 201220530863 CN201220530863U CN203119291U CN 203119291 U CN203119291 U CN 203119291U CN 201220530863 CN201220530863 CN 201220530863 CN 201220530863 U CN201220530863 U CN 201220530863U CN 203119291 U CN203119291 U CN 203119291U
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- distribution network
- voltage distribution
- protection device
- arc extinguishing
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Abstract
The utility model discloses a water type arc extinguishing clearance protection device for a middle/low voltage distribution network. When the water type arc extinguishing clearance protection device is used in thunderstorm weather, lightning stroke trip-out rate and lightning line breakage rate of middle/low voltage AC/DC electric power system are reduced. The water type arc extinguishing clearance protection device is equipped between two ends of a power transmission/distribution insulator string in parallel. The water type arc extinguishing clearance protection device can be broken down before the insulator string for introducing current of the lightning stroke to ground. When power-flow current passes, the length of an air main gap can be automatically increased, thereby elongating freewheeling arc. Simultaneously electronegative gas (water steam) is filled in the increased semi-closed gap and injected, thereby greatly improving whole insulation breakdown strength of the clearance instantly. On condition that recovery voltage is not changed, arc heat radiation is improved and insulation strength of the gap is increased greatly, and therefore arc extinguishing is ensured. The water type arc extinguishing clearance protection device for the middle/low voltage distribution network comprises the following components: a parallelly connected grounding electrode, an insulation water column arc extinguisher, a thin water column arc injection channel, a parallelly connected conductor electrode and the air main gap. The water type arc extinguishing clearance protection device for the middle/low voltage distribution network has the following advantages: low fabrication cost, simple operation in mounting, capability of being broken down repeatedly, high durability, and no hidden trouble.
Description
Technical field
The utility model relates to a kind of protection gap of protecting insulator string, lead to avoid the calcination of short circuit power frequency continued flow electric arc, has been specifically related to a kind of steam nature arcing parallel connection gaps device that is applicable to mesolow electric power system electric line.
Background technology
Low and medium voltage distribution network is owing to be not important load place, thus its all the time its tripping rate with lightning strike and stroke-incidence rate all remain high, also there are thunderbolt (direct lightning strike or respond to thunder) in low voltage electric network such as 10kV power distribution network insulated aerial lead conclusion must break.Yet along with constantly constantly expanding of Power System Shortcuts capacity and electric line area, thunderbolt (induction thunder and direct lightning strike) trip-out rate and broken string rate of failure will become the important indicator of all electric pressure electric company examination power grid operations.Remote ground, area, low and medium voltage distribution network many places is because geological problem makes that earth resistance is difficult to improve; The electric line corridor is many through slope with a varied topography again, makes it increased suddenly by the thunder area.Undoubtedly, two problems are mainly considered in the lightning protection of low and medium voltage distribution network electric line, and one is safety and effect problem, and another then is the cost problem.Transform earth mat resistance and set up lightning conducter or shielding conductor the most expensive method beyond doubt, operational effect for many years also can not satisfy the mains supply stability requirement.
The difficulty that the special geographical position, hillside of low and medium voltage distribution network has caused lightning arrester to install.At first, than higher, and the residing normally earth mat of low and medium voltage distribution network resistance is big and be difficult to the area that changes, forces to install the effect that lightning arrester can not get desirable lightning protection certainly to the requirement of earth mat resistance for lightning arrester; Secondly, the lightning arrester that install in the suburb often meets with the stolen phenomenon of copper downlead, and the copper downlead is in a single day stolen, and lightning arrester will perform practically no function; Moreover leakage conductor purchase cost height is installed difficulty, the operating maintenance inconvenience, and under lightning impulse, have kelvin effect, blast easily is unfavorable for electrical network economy, safety, stable operation under the big electric current.
Because transportation and landform problem, low and medium voltage distribution network relatively are fit to easy thunder resisting equipment is installed, arcing horn (or claiming common parallel connection gaps) is more easy thunder resisting equipment.When thunderbolt took place transmission line, arcing horn or common gap insulator string preferential and in parallel punctured, and lightning current is leaked into the earth, thereby plays the effect of protection transmission line and insulator.Because arcing horn does not have the arc extinguishing ability, when gap power frequency continued flow electric arc can not be from horizontal blanking, circuit breaker trips equally, and it cooperates the effect that can obtain to prevent preferably the impermanency short trouble with auto recloser, is the way that exchanges " low rate of failure " with " high trip-out rate " for.Problem is, has many relatively backward power distribution networks that auto recloser is not installed, and the circuit breaker lock that do not knock-on all is equivalent to permanent fault, all causes " power outage ", influences the electrical network economy benefit; Simultaneously, circuit breaker repeatedly on-load tripping operation also can obviously influence its function and shorten its life-span, will cause more serious power grid accident when the circuit breaker failure tripping.
So at low and medium voltage distribution network lightning protection problem, lightning arrester or common gap in parallel are installed worthless place, all has suitable hidden danger after the installation.
Therefore, it is considerable that low and medium voltage distribution network is badly in need of a kind of cost, is easy to transportation, installs, overhauls, and can play the device that arc quenching effect reduces the thunderbolt circuit breaker trip again.
Summary of the invention
The purpose of this utility model is the deficiency at existing low and medium voltage distribution network lightening arresting method and equipment, provides a kind of low and medium voltage distribution network of the low and medium voltage distribution network electric line lightning protection that falls behind that is applicable to protect inter space device with the ability of swimming blow-out.Under thunderstorm weather, the thin water column spray arc passage (4) of this device fills with water column, and its protection main gap is for only being air main gap (6), and the power distribution network lightning withstand level is decided by this device.This moment, this device not only had the earial drainage function of arcing horn, also can independently extinguish the power frequency continued flow electric arc after thunder and lightning punctures simultaneously fast, guaranteed that the thunderbolt circuit breaker does not trip; When fine; water in the thin water column spray arc passage (4) all is evaporated; the protection main gap of this device comprises the length of air main gap (6) and thin water column spray arc passage (4); its dielectric strength will be more than or equal to the dielectric strength of insulator string; the power distribution network lightning withstand level is decided by insulator string; this just makes this inter space device malfuncton probability reduce greatly, just protects electric line when only being struck by lightning under the thunderstorm effect, also can not cause the reduction of distribution system lightning withstand level at ordinary times.
In order to realize extinguishing under the thunderstorm weather purpose of thunderbolt power frequency continued flow electric arc; the utility model has adopted following technical scheme: under the thunderstorm weather when filling up water in the thin water column spray arc passage (4) of insulation water column extinguisher (3); water surface to grounding electrode in parallel (2) is formed best protection main gap; be about 75% one 80% of insulator string length, dielectric strength is weaker than insulator string.This protection main gap is after thunder and lightning puncture power frequency continued flow is built arc; afterflow electric arc makes steam gasification; the length of protection main gap becomes the length that the original length adds thin water column spray arc passage (4); total length is equal to or greater than insulator string length; the insulation that moment promotes the air main gap significantly is breakdown strength and air coefficient of heat transfer again; and HTHP electronegativity gas is arranged from thin water column spray arc passage (4) ejection; force arc energy fast to transfer of air, final electric arc extinguishes greater than recovery voltage because of air gap insulation recovery intensity.
Its blow-out process further is in detail: the arc current thin water column of flowing through, water is under the powerful energy of arc current, moment is gasificated into steam and expands in thin water column spray arc passage (4), high-temperature high-pressure steam plays direct cooling effect to electric arc on the one hand, block and order about electric arc on the other hand away from parallel conducting wire electrode (5) and to the air heat radiation, two aspect effects increase coefficient of heat transfer suddenly; After being gasificated into the steam of insulation under the arc energy effect, thin water column spray arc passage (4) has just become the part of air main gap to water as electric conductor, and this has not singly elongated electric arc, has increased insulation recovery intensity and the insulation disruptive strength in gap simultaneously yet; Steam has very big electron affinity as electronegative gas (electronegativity of oxygen element be 3.5 be only second to fluorine 4.0), can catch airborne electronics, and the electronics of arc current is had adhesion effect, plays the effect of a deionization.And be full of electronegative gas steam thin water column spray arc passage (4) insulation than the air gap of equal length be eager to excel many.
Therefore, power frequency continued flow electric arc will reliably extinguish under the restriction of many-sided factor.
Grounding electrode in parallel (2) is much shorter than parallel conducting wire electrode (5), and air main gap (6) is in the last position of insulator string, and the lead side is left insulation water column extinguisher (3) and thin water column spray arc passage (4) for regard to having enough spaces like this.T type of the whole formation of device is conducive to electric arc and up flies away under the heat power effect, and this also is equal to the coefficient of heat transfer that has increased electric arc.
After guaranteeing that the gap power frequency continued flow is built arc, can more effective elongation electric arc and further increases heat dissipation capacity in the gap, can manufacture helical form to thin water column spray arc passage (4), to increase the electric arc distance of having passed by, is easier to it and extinguishes.
Steam has enough pressure, and electric arc is driven out thin water column spray arc passage (4) is the successful key of this device, will spray very thin that arc passage (4) does to thin water column for this reason; Insulation water column extinguisher (3) can be by common insulating material, also can be by the material manufacturing of aerogenesis in a large number under high-temperature and high-pressure conditions, and institute's aerogenesis body is driven the backup means of assisting a ruler in governing a country of electric arc as steam; Moreover the wall thickness of insulation water column extinguisher (3) satisfies the pressure requirement of steam, is unlikely to water and explodes under the arc energy effect.
Under the thunderstorm weather, in order to ensure the correct puncture of thunder and lightning from earth electrode in parallel (2) and thin water column spray arc passage (4) water column surface, insulation water column extinguisher (3) outer surface is processed into corrugated (waterproof), can effectively avoid thunder and lightning to puncture along face.
Advantage of the present utility model:
The advantage that the utility model is applied to the low and medium voltage distribution network lightning protection maximum of more remote or backward areas is: the input that can reduce the lightning protection cost; be convenient to transportation, installation, maintenance again; can reach again simultaneously and extinguish power frequency arc and avoid the circuit breaker trip that is struck by lightning; both protect insulator string, power transmission and distribution lead, and can prolong the useful life of circuit breaker again.Other advantages are as follows:
1. this device biggest advantage is: transport lightly, install easily, and can reuse for a long time.Be applicable to the low and medium voltage distribution network system that remote districts fall behind.
2. insulation water column extinguisher (3) is the critical component of this device arc extinguishing, and it is passive gasification moment by liquid water to transfer insulator to from electric conductor, and in the time of the electric arc of elongation gap, the water column extinguisher (3) that insulate also changes the spray arc device of insulation into.Because the inner steam that is full of whole gasifications, it is many to be eager to excel in the general equal length air gap of insulation property; Aqueous water gasifies in semi-enclosed space and expands to diffusion at a high speed, drives electric arc away from electrode tip, plays the arc extinguishing effect.
3. this Unit Installation can not produce bad or implicit consequence.Because the air main gap comprises thin water column spray arc passage (4) when fine day, its insulation disruptive strength is equal to or greater than the insulation disruptive strength of insulator, can not reduce the lightning withstand level of original electric power system.
4. this device suppresses the development of electric arc from many aspects simultaneously: the elongated arcing of main gap, the cooling effect of steam, the thermolysis of spray arc reach the adhesion effect to electronics, the aerogenesis spray arc of insulation water column extinguisher (3) is assisted a ruler in governing a country effect etc., guarantees to extinguish the arc current of certain amplitude.
Description of drawings
Fig. 1 is the structural representation that the utility model one embodiment is applied to the built on stilts plain conductor of 35kV electric pressure.
Fig. 2 is the structural representation that the utility model one embodiment is applied to the built on stilts plain conductor of 10kV electric pressure.
Reference numeral: line insulator string 1, grounding electrode 2 in parallel, insulation water column extinguisher 3, thin water column spray arc passage 4, parallel conducting wire electrode 5, air main gap 6.
Embodiment
Below in conjunction with drawings and Examples the utility model is further specified.
Embodiment 1:
As shown in Figure 1, a kind of ability of swimming blow-out protection inter space device that is applied to the 35kV overhead transmission line comprises grounding electrode in parallel (2), insulation water column extinguisher (3), thin water column spray arc passage (4), parallel conducting wire electrode (5), air main gap (6).
Embodiment 2:
As shown in Figure 2, a kind of ability of swimming blow-out protection inter space device that is applied to the 10kV overhead transmission line comprises grounding electrode in parallel (2), insulation water column extinguisher (3), thin water column spray arc passage (4), parallel conducting wire electrode (5), air main gap (6).
Claims (4)
1. a low and medium voltage distribution network is protected inter space device with the ability of swimming blow-out; comprise the grounding electrode in parallel (2) and the parallel conducting wire electrode (5) that are parallel to the insulator string two ends; insulation water column extinguisher (3) is installed on parallel conducting wire electrode (5); comprise thin water column spray arc passage (4); form low and medium voltage distribution network between grounding electrode (2) in parallel and the insulation water column extinguisher (3) and protect the air main gap (6) of inter space device with the ability of swimming blow-out; it is characterized in that: insulation water column extinguisher (3) can also can be by the material manufacturing that can produce gas under hot conditions by common insulating material manufacturing; opening thin channel in its centre namely is thin water column spray arc passage (4), and the outer surface manufacturing of insulation water column extinguisher (3) has ripple.
2. low and medium voltage distribution network according to claim 1 is protected inter space device with the ability of swimming blow-out; it is characterized in that: grounding electrode in parallel (2) will be lacked than parallel conducting wire electrode (5); air main gap (6) is in the last position of insulator string; T type of the whole formation of device is conducive to electric arc and up flies away under the heat power effect.
3. low and medium voltage distribution network according to claim 1 is protected inter space device with the ability of swimming blow-out; it is characterized in that: insulation water column extinguisher (3) one ends are opened internal thread; screw thread screw thread over parallel conducting wire electrode (5) one ends, both can carry out safe, reliable, seamless connection.
4. low and medium voltage distribution network according to claim 1 is protected inter space device with the ability of swimming blow-out; it is characterized in that: thin water column spray arc passage (4) is rectilinear form in insulation water column extinguisher (3) substantially; but also can do curl, just increase the distance of thin water column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220530863 CN203119291U (en) | 2012-10-17 | 2012-10-17 | Water type arc extinguishing clearance protection device for middle/low voltage distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220530863 CN203119291U (en) | 2012-10-17 | 2012-10-17 | Water type arc extinguishing clearance protection device for middle/low voltage distribution network |
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| Publication Number | Publication Date |
|---|---|
| CN203119291U true CN203119291U (en) | 2013-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220530863 Expired - Fee Related CN203119291U (en) | 2012-10-17 | 2012-10-17 | Water type arc extinguishing clearance protection device for middle/low voltage distribution network |
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| CN (1) | CN203119291U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103779787A (en) * | 2012-10-17 | 2014-05-07 | 李世民 | Water type arc extinguishing clearance protection device for middle/low voltage distribution networks |
| CN104952564A (en) * | 2014-03-27 | 2015-09-30 | 国家电网公司 | Insulator |
-
2012
- 2012-10-17 CN CN 201220530863 patent/CN203119291U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103779787A (en) * | 2012-10-17 | 2014-05-07 | 李世民 | Water type arc extinguishing clearance protection device for middle/low voltage distribution networks |
| CN103779787B (en) * | 2012-10-17 | 2016-05-18 | 李世民 | Ability of swimming blow-out protection inter space device for low and medium voltage distribution network |
| CN104952564A (en) * | 2014-03-27 | 2015-09-30 | 国家电网公司 | Insulator |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130807 Termination date: 20161017 |