CN2164602Y - Controllable electricity discharging lightning rod - Google Patents

Abstract

The utility model relates to a controllable discharging lightning rod which is a lightning protecting device used for electric power systems and various buildings, comprising a rod head part which comprises a metallic circular ring which is supported by an insulating support whose outer surface is coated with semi-conductor lacquer and a rod body which is positioned at the centric axial direction, a supporting column and a grounding body. The controllable discharging lightning rod can have dynamic protective properties according to the strength of a lighting cloud electric field, reducing the lighting stream to reduce the electromagnetic interference on ambient periphery objects, and consequently increasing the safety of the object protected.

Description

Controllable electricity discharging lightning rod

The utility model relates to a kind of lightning protection device that is used for electric power system and various buildings.

The Franklin lightning rod of continuing to use more than 200 year exists intrinsic shortcoming, and the electric charge that its head of performance dependence of its protective effect gathers under the thundercloud electric field induction is to thunder discharge guide's sucking action.Like this; have two kinds of situations that the protection error may take place: the one, when thunder-strike current is smaller; it is without a head that upward charge inducing is few; sucking action is strong inadequately; thunder just may not hit on the lightning rod and hit on protected object, another be lightning rod than condition with higher, this moment, the thundercloud electric field was lower; also do not reach development thunder and lightning guide's degree, corona discharge has appearred in lightning rod top.The corona of this too early appearance is the residual same sex electric charge that gathers with needle point in a large number near needle point; the electric charge that has consequently squeezed needle point gathers; weakened its sucking action, hindered the protective effect performance of lightning rod, increased the chance of error the thunder and lightning guide.The Franklin lightning rod is to guide thunderbolt into self when shielding.The thunder discharge guide of development directly contacts with ground connection good metal structure downwards, positive and negative charge begins fierce neutralization and upwards development promptly here, presenting from macroscopic view has powerful thunder-strike current to go into ground by syringe needle and downlead, the road of lightning current process is very high through potential rise, produce the serious interference of electromagnetic field near making, damage the electronic and electrical equipment in the building.

Dissipation array is a kind of new direct striking thunder prevention device that last decade occurs, this device wish to utilize the corona current of the generation thundercloud electric field action under come slowly in thundercloud in electric charge.As everyone knows, just development earthward rapidly in case take place in downward thunder discharge guide.Occur to from the guide that to hit the whole process of ground object extremely short, only need tens ofly to hundreds of milliseconds, in the so short time, neutralization is very little, so neutralization mainly is before the guide is developed.According to field measurement record, the corona current of dissipation array is a microampere order, and thundercloud charge is up to a hundred coulombs, and thundercloud time of electrifying is very short, only several minutes to ten several minutes.Therefore, by in the corona charge and thundercloud charge quantitatively be very limited, dissipation array usually is struck by lightning so far, does not reach the purpose of the thunder that disappears.Also more popular both at home and abroad other direct striking thunder prevention device all is their mutation substantially.

The purpose of this utility model provides and a kind ofly can have the dynamic protection characteristic according to the power of thundercloud electric field, and can reduce the lightning current that passes through, to reduce the lightning protection device that object is on every side produced electromagnetic interference.

The utility model realizes as follows, the metal ring 2 that is supported by the insulating support 3 that scribbles semiconductor varnish and be positioned at the axial needle body of circle ring center 1 and constitute syringe needle part and discharging gap 4, pillar 5, earth electrode 6 composition controlled discharge lightning rods.Discharging gap is isolated syringe needle and pillar.The needle body top is a hemisphere.Two pole plate opposite positions of discharging gap are semicircular arc.

Accompanying drawing 1, the utility model structure chart.

Accompanying drawing 2, the utility model syringe needle part vertical view.

Accompanying drawing 3, the utility model discharging gap structure chart.

By reference to the accompanying drawings operation principle of the present utility model is elaborated. When the thundercloud electric field was more weak, discharging gap played the effect of isolation syringe needle and pillar, and the syringe needle above earth potential is floated, and had reduced the potential difference of syringe needle and surrounding space. The syringe needle of metal ring and needle body configuration combination, the again balanced electric field at needle body top. Thereby this device has the effect of good inhibition corona when the thundercloud electric field is more weak, can avoid occurring too early corona. After the thundercloud electric field reaches certain numerical value, when namely approaching the level before thunderbolt takes place, gap discharge, the instantaneous earth potential of obtaining of needle body. At this moment, because the resistance effect of the semiconductor varnish that is coated with on the insulating support 3, the current potential of ring wouldn't become, thereby reach near the effect of the electric field of distortion needle body, be conducive to from needle body top development discharge upwards. From the needle body top a upwards spark generation of discharge is arranged immediately behind gap breakdown, the lightning leader that causes earthward development discharges to needle body. If cause unsuccessfully, gap discharge stops immediately, and needle body returns to quick condition, lightning leader by and syringe needle between electric capacity charged in the gap, until the gap punctures for the second time, repeat said process. As long as choosing suitably of gap and syringe needle size, causing just can success.

Advantage of the present utility model is to form lightning-arrest by the syringe needle with special tectonic and the discharging gap of controlling dynamic characteristic Pin. When the thundercloud electric field is more weak, utilize its structure can make syringe needle top electric field even, suppress early stage corona discharge. During near the lightning discharge level, utilize its structure at the thundercloud electric field, the thunderbolt of initiation be by syringe needle upwards the guide of development attracted, the neutralization of positive and negative charge occurs in the somewhere, space, has alleviated the electrostatic induction of lightning leader to ground object. Because the resistance of upward leader is big more than metal structure, neutralization reaction is slowed down greatly, has namely greatly reduced rising steepness and the amplitude of thunder-strike current, reduced thunder-strike current by the time the very big potential rise that causes and electromagnetic interference that object is on every side produced. Because this device just works in the time of will taking place in thunderbolt, thus can not cause increasing the number of times of thunderbolt, thus increased greatly the security of protected object, also enlarged protection domain.

Embodiment of the present utility model is as follows, and needle body 1 is about 1 meter, can select for use stainless steel material or other metal material to make, and the top is a hemisphere.Metal ring 2 usefulness aluminium alloys are made, 3 meters of ring Zhou Changyue.Insulating support 3 is the expoxy glass pipe, is about 1.8 meters, and outer surface scribbles semiconductor varnish, and its resistance is 200～2000 kilo-ohms, the support metal annulus.Two pole plates 7 of discharging gap 4 make the two-plate opposite position become semicircular arc by the corrosion resistant plate mold pressing, become non-uniform electric field slightly.Isolate with organic insulating material 8 between pole plate, there is skirt the outside, to obtain bigger sheet resistance.A pole plate of discharging gap links to each other with needle body, and another pole plate links to each other with pillar.Pillar can adopt round steel pipe or angle steel to make.Earth electrode is through pillar ground connection.The utility model can be loaded on industry, civilian and military architecture thing, particularly high-rise or the building of microelectronic device is housed, and its mounting means is identical with existing widely used lightning rod.

Claims (4)

1, a kind of controlled discharge lightning rod, it is characterized in that the metal ring that supports by the insulating support of outer surface apposition semiconductor varnish and be positioned at the axial needle body of circle ring center constitute syringe needle partly and discharging gap, pillar, earth electrode form.

2, controlled discharge lightning rod as claimed in claim 1 is characterized in that discharging gap isolation syringe needle and pillar.

3, controlled discharge lightning rod as claimed in claim 1 is characterized in that the needle body top is a hemisphere.

4, controlled discharge lightning rod as claimed in claim 1 is characterized in that two pole plate opposite positions of discharging gap are semicircular arc.

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