CN103151124B - Spool-type lightning insulator for low-voltage distribution line with external series spark gap - Google Patents
Spool-type lightning insulator for low-voltage distribution line with external series spark gap Download PDFInfo
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- CN103151124B CN103151124B CN201310074125.4A CN201310074125A CN103151124B CN 103151124 B CN103151124 B CN 103151124B CN 201310074125 A CN201310074125 A CN 201310074125A CN 103151124 B CN103151124 B CN 103151124B
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Abstract
The invention relates to a spool-type lightning insulator for a low-voltage distribution line with an external series spark gap. The spool-type lightning insulator comprises two porcelain pieces, a fastening bolt and a resistor assembly, wherein the two porcelain pieces are straight halved to form a circumferential gap with a Y-direction height and an X-direction width, and a conductor is arranged outside the circumferential gap; the resistor assembly is included in the two porcelain pieces and positioned at the inner side of the circumferential gap, and the circumferential gap between the conductor and the resistor assembly forms a spark gap; the conductor and the resistor assembly form two electrodes of the spark gap, and the fastening bolt is vertical to the width direction of the circumferential gap and penetrates through the central axes of the two porcelain pieces and the resistor assembly to fasten the two porcelain pieces and the resistor assembly; and an adhesive is arranged among the porcelain pieces, the resistor assembly and the fastening bolt. The spool-type lightning insulator provided by the invention is suitable for the low-voltage distribution line, is universally used with the traditional line structure and fittings, and is convenient and quick to install and maintain; and the maintenance is avoided, the failure rate is low, and the power transmission of the line is not affected even if the failure occurs.
Description
Technical field
The present invention relates to a kind of lightning protection insulator, specifically, relate to a kind of spool-type lightning protection insulator being applicable to guest performer's discharging gap of low-voltage distributing line.
Background technology
Low-voltage distributing line (220V/380V) is effective lightning protection measures never, and this increases with current rapid economic development, power demands, a large amount of intelligent electric appliance enters user, power supply reliability requires that the present situation improved does not conform to.Trace it to its cause, do not have the line thunder protection product be suitable for be main cause:
1. existing low-voltage distribution lightning-protected product reliability is not high, can not accomplish less trouble and non-maintaining.When it damages, both can affect circuit power transmission, again a large amount of for cost manpower and materials and time be fixed a breakdown, not be suitable for line thunder protection protection.
1.1 porcelain overcoats or composite sheath low pressure arrester without gaps, once damage punctures, can produce obvious fault point and switch trip when can not damage as high-voltage arrester, but can cause continuation earth fault, consume a large amount of electric energy and possibility initiation fire.
1.2 traditional lightning arrester heat-explosion type disconnectors are because there being certain pressure drop, and this pressure drop may exceed the residual voltage of low voltage surge arrester, is not suitable for low voltage surge arrester.And though hot melten type release unit does not have this problem; but there is action blind area: as moment of fault current is very large; resistor disc punctures; form carbonization passage; disconnector just loses thermal source and forms tripping; and SPD(Surge Protector) significantly do not expose electrical break point with hot melten type disconnector, use more difficult discovery fault point on the line.
1.3SPD is only suitable for being contained in switch-box, is not suitable for being contained in circuit.Protect on insulator limit with low voltage surge arrester, complex structure cost is high, outdated.
2. existing lightning arrester GB is to the requirement (GB11032) of low voltage surge arrester, and essential electrical characterisitic parameter regulation is less than normal, as nominal discharge current only has 1.5kA; 2ms square wave only has 50A; 4/10 μ s big current is 10kA, is not suitable for line thunder protection requirement.
3. the same with arrester without gaps, in band, the low voltage surge arrester in string gap is once damage, and can form persistent failure ground connection, affect circuit power transmission.And external serial gap is because of discharge parameter reason, for low-pressure system, clearance distance is minimum and not easily configure, and is subject to extraneous factor impact and changes.
Low-voltage distributing line lightning-protected product should possess and meet following requirement:
1. can with existing line construction form and gold utensil general, directly replace existing line insulator, and Lightning Over-voltage of releasing, cut off power frequency continued flow ability, the mechanical force needed for insulator can be born; Possess the creepage distance needed for line insulation, electrical insulation properties and weathering capabilities.
2. can accomplish non-maintaining and less trouble; Even if do not affect circuit power transmission during fault yet.Should be with external serial gap, even if lightning arrester body moisture damage, external serial gap insulation is unaffected.Like this can dual fail-safe: resistor disc damages, and has external serial gap shielding system power-frequency voltage, does not affect power transmission.Otherwise just in case gap is because of certain reason short circuit, resistor disc can bear system voltage separately chronically.
3. for be not house lead in circuit in the middle of shaft tower, self-protection should be had, from clamper function, shaft tower natural grounding can be made full use of and to release overvoltage energy, not need Special grounding.This is because Special lightning protection earth connection setup cost is far above lightning-protected product itself, and poor reliability, once broken string has unsafe factor.
To house lead in shaft tower, can establish Special grounding wire, reduce cross-arm current potential when being struck by lightning, being beneficial to can by the Lightning Over-voltage interception of large absolutely portion out of doors.Can to likely house lead in, energy direct thunder greatly, play slicing effect, alleviate the pressure of indoor SPD.
Leakage conductor be directly proportional to the height of electric pressure (namely the size of flash-over characteristic parameter) with guest performer's discharging gap distance, as the leakage conductor discharging gap g distance of 10kV, be about 50mm.Low-voltage distributing line lightning arrester, by its flash-over characteristic and insulation coordination, clearance distance only has several millimeters.As pressed traditional high-voltage line lightning arrester (10kV surge arrester with external series gaps as shown in Figure 1), it comprises lightning arrester body 81, its lower end has the lead-in wire 82 of composite sheath and connects wire, lightning arrester body 81 is provided with discharging gap ball 83 and lower sparking electrode 84, is formed with guest performer's discharging gap g therebetween.As low-voltage circuit lightning arrester designs in such a way, its external serial gap natural formation arranges comparatively difficult and loaded down with trivial details, and cost is high, and the short circuit of Yi Beiyu, ice and snow and toy institute, be subject to external force and be out of shape.Therefore need to design a kind of lightning protection insulator having guest performer's discharging gap being applicable to low-voltage distributing line completely newly.
Summary of the invention
The object of this invention is to provide a kind of versatility comparatively strong, non-maintaining and less trouble, the spool-type lightning protection insulator being applicable to guest performer's discharging gap of low-voltage distributing line that reliability is high can be accomplished.
For achieving the above object, the technical solution used in the present invention is:
Have a low-voltage distributing line spool-type lightning protection insulator for guest performer's discharging gap, be installed on low-voltage distributing line, it comprises two porcelain pieces, fastening bolt, resistor disc assembly;
Porcelain piece described in two is involutory and arranges and form the circumferential gap with the height of Y-direction and the width of X-direction, and wire is arranged at the outside of described circumferential gap; Described resistor disc assembly is positioned at the inner side of described circumferential gap by inclusion within the porcelain piece described in two; The end face direction of described resistor disc assembly parallels with the Width of described circumferential gap and near described porcelain piece, the lateral surface of described resistor disc assembly is near described circumferential gap; Described circumferential gap between described wire and described resistor disc assembly forms a discharging gap, and described wire and described resistor disc assembly form two electrodes of described discharging gap;
Described fastening bolt is arranged perpendicular to the Width of described circumferential gap, and described fastening bolt runs through the axis place that is arranged at porcelain piece described in two and described resistor disc assembly and the porcelain piece described in two and described resistor disc assembly is fastened, and is provided with adhesive between described porcelain piece, described resistor disc assembly, described fastening bolt.
Preferably, described resistor disc assembly is that axle center has the cylindric of the first through hole, and it has the opposing parallel end face described in two and forms the inner cylinder face of the external cylindrical surface of its outer peripheral face and the first through hole described in formation;
Described resistor disc assembly comprises outer ring electrode, inner rings of electrode, ring resistance sheet; Described ring resistance sheet is the axis that axle center has the namely described resistor disc assembly of the axis of the cylindric and described ring resistance chip module of the second through hole; Described ring resistance sheet has opposing parallel two annular cross sections and forms the inner peripheral surface on the face of cylinder of the outer circumference surface on its face of cylinder, periphery and the second through hole described in being formed; One end of described outer ring electrode is connected with the cross section electrical contact described in of described ring resistance sheet, and the other end of described outer ring electrode forms the external cylindrical surface of described resistor disc assembly; Cross section electrical contact described in another of one end of described inner rings of electrode and described ring resistance sheet is connected, and the other end of described inner rings of electrode forms the inner cylinder face of described resistor disc assembly; Insulation filling glue is filled with between described outer ring electrode, described inner rings of electrode, described ring resistance sheet.
Preferably, described outer ring electrode comprises the first vertical portion and first horizontal component of perpendicular setting, and the first described horizontal component arranges near the upper end of the first described vertical portion and has the first distance apart from described upper end; Described inner rings of electrode comprises the second vertical portion and second horizontal component of perpendicular setting, the second described horizontal component arranges near the bottom of the second described vertical portion and has second distance apart from described bottom, and the first described horizontal component and the second described horizontal component are connected with the cross section described in two of described ring resistance sheet and cover described cross section completely respectively.
Preferably, the first described distance equals described second distance;
The insulation filling glue of filling between described outer ring electrode, described inner rings of electrode, described ring resistance sheet forms two end faces of described resistor disc assembly, and the top of the first described horizontal component is coated with thickness and the described first equidistant described insulation filling glue, the below of the second described horizontal component is coated with the thickness described insulation filling glue equal with described second distance.
Preferably, the diameter of section being formed described external cylindrical surface by the first vertical portion of described outer ring electrode is great circle internal diameter, and the end of the first horizontal component of described outer ring electrode forms the circular hole that diameter is roundlet internal diameter; The diameter of section of the inner cylinder face described in the second vertical portion of described inner rings of electrode is formed is roundlet external diameter, and the end of the second horizontal component of described inner rings of electrode forms the circumference that diameter is great circle external diameter; The end of the first horizontal component of described outer ring electrode is mutually concordant with the inner peripheral surface of described ring resistance sheet, and the end of the second horizontal component of described inner rings of electrode is mutually concordant with the outer circumference surface of described ring resistance sheet.
Preferably, first insulation distance of the formation between the internal side diameter of the external cylindrical surface of described resistor disc assembly and the outer circumference surface of described ring resistance sheet is more than or equal to the thickness of described ring resistance sheet, and the second insulation distance formed between the inner cylinder face of described resistor disc assembly and the inner peripheral surface of described ring resistance sheet is more than or equal to the thickness of described ring resistance sheet.
Preferably, described fastening bolt comprise the screw rod running through described porcelain piece and described resistor disc assembly, the two ends being threaded onto described screw rod respectively and by described porcelain piece and described resistor disc assembly clamping two nuts.
Preferably, on its cross-arm being installed on low-voltage distributing line or on anchoring; Described cross-arm or described anchoring are connected with described fastening bolt.
Operation principle of the present invention is: this spool-type lightning protection insulator is installed on the line, and as being arranged on cross arm of tower, conducting wire binding is outside the involutory circumferential gap of two porcelain pieces.When being struck by lightning, (wire is if any insulating barrier along wire disruptive discharge gap for lightning current, then first puncture insulating barrier), the air now in gap is ionized and becomes conduction state, and electric current dodges to iron and enters resistor disc assembly ground connection and overvoltage energy of releasing after fastening bolt again.After lightning current, resistor disc component recovery high resistant and cut off power frequency continued flow, the air combined discharging gap that makes of ionization recovers insulation, thus avoids switch trip and circuit scaling loss.
Because technique scheme is used, the present invention compared with prior art has following advantages: spool-type lightning protection insulator of the present invention is applicable to low-voltage distributing line, itself and existing line construction and gold utensil general, install and safeguard convenient; And it can accomplish non-maintaining and less trouble, even if it breaks down also can not affect circuit power transmission.
Accompanying drawing explanation
Accompanying drawing 1 is the schematic diagram of existing 10kV surge arrester with external series gaps.
Accompanying drawing 2 is the structure cutaway view having the low-voltage distributing line spool-type lightning protection insulator of guest performer's discharging gap of the present invention.
Accompanying drawing 3 is the structure cutaway view having the resistor disc assembly of the low-voltage distributing line spool-type lightning protection insulator of guest performer's discharging gap of the present invention.
Accompanying drawing 4 is the scheme of installation having the low-voltage distributing line spool-type lightning protection insulator of guest performer's discharging gap of the present invention.
Accompanying drawing 5 is the scheme of installation having the low-voltage distributing line spool-type lightning protection insulator of guest performer's discharging gap of the present invention.
In above accompanying drawing: 1, porcelain piece; 2, fastening bolt; 3, resistor disc assembly; 31, outer ring electrode; 32, inner rings of electrode; 33, ring resistance sheet; 34, insulation filling glue; 4, adhesive; 5, wire; 6, cross-arm; 7, anchoring; 81, lightning arrester body; 82, composite insulator; 83, upper discharging gap ball; 84, lower sparking electrode.
Embodiment
Below in conjunction with embodiment shown in the drawings, the invention will be further described.
Embodiment one: shown in accompanying drawing 2.There is a low-voltage distributing line spool-type lightning protection insulator for guest performer's discharging gap, be installed on low-voltage distributing line.
This spool-type lightning protection insulator comprises two porcelain pieces 1, fastening bolt 2, nonlinear resistor disc assembly 3.
Two porcelain pieces 1 are involutory and arrange and form the circumferential gap with the height of Y-direction and the width of X-direction, and wire 5 binding wire ties up the outside at circumferential gap.Resistor disc assembly 3 is positioned at the inner side of circumferential gap by inclusion within two porcelain pieces 1.The end face direction of resistor disc assembly 3 parallels with the Width (X-direction) of circumferential gap and near porcelain piece 1, the lateral surface of resistor disc assembly 3 is near circumferential gap.Circumferential gap between wire 5 and resistor disc assembly 3 forms the discharging gap g(X direction of a guest performer), wire 5 and resistor disc assembly 3 form two electrodes of discharging gap.Porcelain piece 1 plays a part insulation to two electrodes, support, fixing.This discharging gap g distance is that design is fixing, is be made up of electrotechnical ceramics insulating supporting, the calcination repeatedly of resistance to electric arc, can not affect because of climate temperature, external force and change.The distance of discharging gap g is set to can tolerate 2 times of maximum power-frequency voltages of circuit when normal operation; Resistor disc assembly 3 does not bear voltage, can not be aging, deteriorated because bearing system voltage for a long time.Even if resistor disc assembly 3 damages short circuit, gap g can isolate power-frequency voltage, can not send do not power on because of its short circuit.The width (X-direction) of circumferential gap determines the size of discharging gap Distance geometry discharge parameter.The height (Y-direction) of circumferential gap does not affect discharge parameter, as long as conducting wire binding line does not embed in this gap.
Fastening bolt 2 is arranged perpendicular to the Width (X-direction) of circumferential gap, and it comprises screw rod and two nuts.Fastening bolt 2 runs through the axis place that is arranged at two porcelain pieces 1 and resistor disc assembly 3 and two porcelain pieces 1 and resistor disc assembly 3 is fastened.Adhesive 4 is provided with between porcelain piece 1, resistor disc assembly 3, fastening bolt 2.
Two porcelain pieces 1 and resistor disc assembly 3 are glued together for inside void-free one is overall by adhesive 4, the side insulation effect of the resistor disc that plays lightning protection insulator inner sealing, covers resistor disc assembly 3, strengthens.Two porcelain pieces 1 are involutory, by resistor disc assembly 3 inclusion interior, add the effect of adhesive 4, and resistor disc assembly 3 is not affected by outside climatic factor.Discharging gap g can effective shielding system power-frequency voltage, and when preventing resistor disc assembly 3 from damaging, circuit send and do not power on.
Shown in accompanying drawing 3.Resistor disc assembly 3 has the cylindric of the first through hole in axle center, and its thickness is E2, and it has two opposing parallel end faces and forms the external cylindrical surface of its outer peripheral face and form the inner cylinder face of the first through hole.
Resistor disc assembly 3 comprises outer ring electrode 31, inner rings of electrode 32, ring resistance sheet 33.Outer ring electrode 31 and inner rings of electrode 32 are metal electrodes, connect high potential and electronegative potential respectively during use.Ring resistance sheet 33 has the cylindric of the second through hole and the axis of ring resistance sheet 33 assembly 3 and the axis of resistor disc assembly 3 in axle center.Ring resistance sheet 33 has opposing parallel two annular cross sections (being by the electrode of aluminium-plated preparation) and forms the outer circumference surface on its face of cylinder, periphery and form the inner peripheral surface on the face of cylinder of the second through hole.
Outer ring electrode 31 comprises the first vertical portion and first horizontal component of perpendicular setting, and the first horizontal component is arranged near the upper end of the first vertical portion and distance upper end has the first distance F1.This one end of first horizontal component of outer ring electrode 31 is connected with a cross section electrical contact of ring resistance sheet 33, and this cross section covers by the first horizontal component completely.This one end of first vertical portion of outer ring electrode 31 forms the external cylindrical surface of resistor disc assembly 3.The diameter of section being formed external cylindrical surface by the first vertical portion of outer ring electrode 31 is great circle internal diameter A, and the end of the first horizontal component of outer ring electrode 31 forms the circular hole that diameter is roundlet internal diameter B.The end of the first horizontal component of outer ring electrode 31 is mutually concordant with the inner peripheral surface of ring resistance sheet 33.
Inner rings of electrode 32 comprises the second vertical portion and second horizontal component of perpendicular setting, and the second horizontal component is arranged near the bottom of the second vertical portion and distance bottom has second distance F2.This one end of the second horizontal component of inner rings of electrode 32 is connected with another cross section electrical contact of ring resistance sheet 33, and this cross section covers by the second horizontal component completely, and this one end of the second vertical portion of inner rings of electrode 32 forms the inner cylinder face of resistor disc assembly 3.The diameter of section of the inner cylinder face formed by the second vertical portion of inner rings of electrode 32 is roundlet outer diameter D, and the end of the second horizontal component of inner rings of electrode 32 forms the circumference that diameter is great circle external diameter C.The end of the second horizontal component of inner rings of electrode 32 is mutually concordant with the outer circumference surface of ring resistance sheet 33.
First distance F1 equals second distance F2.First insulation distance of the formation between the external cylindrical surface of resistor disc assembly 3 and the outer circumference surface of ring resistance sheet 33 is more than or equal to the thickness E 1 of ring resistance sheet 33, and the second insulation distance formed between the inner cylinder face of resistor disc assembly 3 and the inner peripheral surface of ring resistance sheet 33 is more than or equal to the thickness E 1 of ring resistance sheet 33.Breakdown voltage value is directly proportional to the size of insulation distance.When can ensure through-flow like this, electric current flows through between two cross sections of ring resistance sheet 33, namely flow into from the great circle internal diameter A of the outer ring electrode 31 of resistor disc assembly 3, flow out from the roundlet outer diameter D of inner rings of electrode 32, instead of iron from the edge of ring resistance sheet 33 to inner ring or outer ring electrode sudden strain of a muscle.
Be filled with insulation filling glue 34 between outer ring electrode 31, inner rings of electrode 32, ring resistance sheet 33, and this insulation filling glue 34 forms two end faces of resistor disc assembly 3.The top of the first horizontal component of outer ring electrode 31 is coated with the thickness insulation filling glue 34 equal with the first distance F1, and the below of the second horizontal component of inner rings of electrode 32 is coated with the thickness insulation filling glue 34 equal with second distance F2.The puncture voltage of insulation filling glue 34, much larger than air, does the insulation between self side insulation that greatly can strengthen annular resistor disc 33 and outer ring electrode 31, inner rings of electrode 32, ring resistance sheet 33 three like this.Insulation filling glue 34 can adopt the material such as epoxy resin, polyurethane, a circular solid is formed after its solidification, its upper and lower end flat, because of the reason of F1 and F2 during injecting glue, it is the insulating cement of F1 and F2 that the part between great circle internal diameter A and roundlet outer diameter D covers thickness.Make thus the first insulation distance to be extended for by great circle internal diameter A to roundlet outer diameter D distance; Make the second insulation distance to be also extended for by great circle internal diameter A to roundlet outer diameter D distance, greatly strengthen the insulation between inner and outer rings electrode 31.
On the cross-arm 6 that this spool-type lightning protection insulator can be installed on the shaft tower of low-voltage distributing line or on anchoring 7, shown in accompanying drawing 4 and accompanying drawing 5.Cross-arm 6 or anchoring 7 are connected with fastening bolt 2, and cross-arm 6 or anchoring 7 are contained on shaft tower, and namely it has lightning protection natural grounding, the overvoltage energy passed over can be released into ground by discharging gap g-resistor disc assembly 3.
Because the diameter in the upper and lower side cross section of resistor disc is identical, lightning current is the same by the area of upper/lower terminal plane electrode, therefore in ring resistance sheet 33, in unit are, current density is much the same, is conducive to the through-flow effective area and the through-current capability that improve resistor disc.In the conventional design of therefore traditional lightning arrester, be all that electrode is arranged on lightning arrester axial both ends of the surface, i.e. a terminated high voltage, one end earthing potential.And as the lightning protection insulator that spool insulator designs, for adapting to directly to replace the reason of existing line insulator and the vibrational power flow because of the fastening bolt 2 of wire 5, discharging gap g and ground connection, two through-flow electrodes need be located at the sagittal plane of resistor disc body, instead of the axial both ends of the surface of traditional resistor disc, namely external serial gap g needs connecting resistance sheet outer circle diameter (high potential is at outer circle diameter); The bolt of earthing potential then needs the centre being inserted in resistor disc.To this, certain available ring resistance sheet 33.Its outer circle diameter makes high-potential electrode, makes guest performer's discharging gap with porcelain piece 1 intermediate gap; Interior diameter makes low-potential electrode, connects grounding screw rod.But the large and interior diameter of the outer circle diameter because of resistor disc is little, the area of two electrodes is greatly different.Time through-flow, the current density that (outer circle diameter) area is large is little, and (interior diameter) current density that area is little is large.And current density is larger in unit are, resistor disc is more fragile.Namely the through-current capability of resistor disc is only decided by the area of electrode prepared by interior diameter; The external diameter of resistor disc is large also inoperative again.Lightning current very high frequency in addition, have collection skin and stress effect, the interior diameter electrode place of resistor disc very easily damages.Interior diameter is because of the stop of resistor disc body in addition, and electrode (aluminium-plated) is also not easily prepared.And in this programme, by outer ring electrode 31, the end flat electrode of ring resistance sheet 33 has been extended the external diameter of resistor disc assembly 3 and internal diameter by inner rings of electrode 32, namely for ring resistance sheet 33, electric current still flows through from the electrode in the cross section at two ends that axially of ring resistance sheet 33, and ring resistance sheet 33 is because of upper, lower two sections diameter is identical, the area of a circle is identical, in resistor disc, the current density of unit are is also just roughly the same, lightning overvoltage is released by the lower surface-resistor disc assembly 3 internal diameters-fastening bolt 2-cross arm of tower 6 of the upper surface-ring resistance sheet 33 of guest performer's discharging gap g-resistor disc assembly 3 external diameters-ring resistance sheet 33 and blocks power frequency continued flow with entering.Therefore can not damage because local current densities is large; Can not the end face inside and outside edge flashover of annularly resistor disc 33, also can not from the end face edge of resistor disc inwardly, outer ring electrode dodges and irons electric discharge, meets the functional design requirements making spool-type lightning protection insulator.
Under lightning overvoltage, distance because of discharging gap g is less than the outer surface creepage distance of insulation of whole porcelain piece 1, therefore during thunderbolt, lightning current can not connect electronegative potential from wire 5 along the outer surface of porcelain piece 1 to fastening bolt 2() dodge and iron, but first the discharging gap g between wire 5 to outer ring electrode 31 punctures, lightning current from the circumferential gap of the involutory annular of two porcelain pieces, enters ground through resistor disc assembly 32 to fastening bolt 2.Because the lightning current duration has extremely short, be μ s level, thermal effect low (now the internal resistance of resistor disc is very little), can not form electrical arc erosion to wire 5, discharging gap g, outer ring electrode 31; And after lightning current; because nonlinear ring resistance sheet 33 recovers high resistant; ended air ionization passage that (g place) formed along lightning current electrical discharge arc and under power frequency continued flow; therefore circuit can not form short circuit tripping operation and electrical arc erosion; available protecting circuit, circuit not burning can be accomplished, thunderbolt not break, insulate do not puncture, power frequency do not trip.
Make the surrounding of ring resistance sheet 33 all be wrapped in insulation filling glue 34 by injecting suitable insulation filling glue 34 in the above-mentioned volume space to being made up of outer ring electrode 31, inner rings of electrode 32 and ring resistance sheet 33, and there is no gap.Puncture insulation level far above air due to solid, therefore improve the insulation level between the radial and axial biend in face, resistor disc medial and lateral.The through-current capability test of independent ring resistance sheet 33, resistor disc can internal breakdown.But can dodge along self surface, inside and outside footpath time more and iron electric discharge.This is because the latter's insulation will be weaker than the former.Ring resistance sheet 33 surrounding is all wrapped in insulation filling glue 34, not easily along resistor disc outer surface flashover breakdown when lightning current passes through, can not discharge along the edge of arbitrary end face directly to inner rings of electrode 32 or outer ring electrode 31, ensure lightning current by time be flow through along the electrode of resistor disc end flat, can not dodge along self outer surface and iron, improve resistor disc through-current capability.
During as being struck by lightning, lightning current energy exceeds the through-current capability of ring resistance sheet 33, and ring resistance sheet 33 damages, and discharging gap g can tolerate separately the system power-frequency voltage of 2 times, avoids circuit to send and does not power on; Otherwise as between discharge gap g because of certain reason just in case be shorted, the rated voltage of ring resistance sheet 33 is greater than system power-frequency voltage, can when gap shorting, long-term work.The effect being designed with dual fail-safe of lightning protection insulator thus, guarantees the normal power transmission of system.
Above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences done according to Spirit Essence of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (7)
1. there is a low-voltage distributing line spool-type lightning protection insulator for guest performer's discharging gap, be installed on low-voltage distributing line, it is characterized in that: it comprises two porcelain pieces, fastening bolt, resistor disc assembly;
Porcelain piece described in two is involutory and arranges and form the circumferential gap with the height of Y-direction and the width of X-direction, and wire is arranged at the outside of described circumferential gap; Described resistor disc assembly is positioned at the inner side of described circumferential gap by inclusion within the porcelain piece described in two; The end face direction of described resistor disc assembly parallels with the Width of described circumferential gap and near described porcelain piece, the lateral surface of described resistor disc assembly is near described circumferential gap; Described circumferential gap between described wire and described resistor disc assembly forms a discharging gap, and described wire and described resistor disc assembly form two electrodes of described discharging gap;
Described fastening bolt is arranged perpendicular to the Width of described circumferential gap, and described fastening bolt runs through the axis place that is arranged at porcelain piece described in two and described resistor disc assembly and the porcelain piece described in two and described resistor disc assembly is fastened, and is provided with adhesive between described porcelain piece, described resistor disc assembly, described fastening bolt;
Described resistor disc assembly is that axle center has the cylindric of the first through hole, and it has the opposing parallel end face described in two and forms the inner cylinder face of the external cylindrical surface of its outer peripheral face and the first through hole described in formation;
Described resistor disc assembly comprises outer ring electrode, inner rings of electrode, ring resistance sheet; Described ring resistance sheet is the axis that axle center has the namely described resistor disc assembly of the axis of the cylindric and described ring resistance chip module of the second through hole; Described ring resistance sheet has opposing parallel two annular cross sections and forms the inner peripheral surface on the face of cylinder of the outer circumference surface on its face of cylinder, periphery and the second through hole described in being formed; One end of described outer ring electrode is connected with the cross section electrical contact described in of described ring resistance sheet, and the other end of described outer ring electrode forms the external cylindrical surface of described resistor disc assembly; Cross section electrical contact described in another of one end of described inner rings of electrode and described ring resistance sheet is connected, and the other end of described inner rings of electrode forms the inner cylinder face of described resistor disc assembly; Insulation filling glue is filled with between described outer ring electrode, described inner rings of electrode, described ring resistance sheet.
2. the low-voltage distributing line spool-type lightning protection insulator having guest performer's discharging gap according to claim 1, it is characterized in that: described outer ring electrode comprises the first vertical portion and first horizontal component of perpendicular setting, the first described horizontal component arranges near the upper end of the first described vertical portion and has the first distance apart from described upper end; Described inner rings of electrode comprises the second vertical portion and second horizontal component of perpendicular setting, the second described horizontal component arranges near the bottom of the second described vertical portion and has second distance apart from described bottom, and the first described horizontal component and the second described horizontal component are connected with the cross section described in two of described ring resistance sheet and cover described cross section completely respectively.
3. the low-voltage distributing line spool-type lightning protection insulator having guest performer's discharging gap according to claim 2, is characterized in that: the first described distance equals described second distance;
The insulation filling glue of filling between described outer ring electrode, described inner rings of electrode, described ring resistance sheet forms two end faces of described resistor disc assembly, and the top of the first described horizontal component is coated with thickness and the described first equidistant described insulation filling glue, the below of the second described horizontal component is coated with the thickness described insulation filling glue equal with described second distance.
4. the low-voltage distributing line spool-type lightning protection insulator having guest performer's discharging gap according to Claims 2 or 3, it is characterized in that: the diameter of section being formed described external cylindrical surface by the first vertical portion of described outer ring electrode is great circle internal diameter, the end of the first horizontal component of described outer ring electrode forms the circular hole that diameter is roundlet internal diameter; The diameter of section of the inner cylinder face described in the second vertical portion of described inner rings of electrode is formed is roundlet external diameter, and the end of the second horizontal component of described inner rings of electrode forms the circumference that diameter is great circle external diameter; The end of the first horizontal component of described outer ring electrode is mutually concordant with the inner peripheral surface of described ring resistance sheet, and the end of the second horizontal component of described inner rings of electrode is mutually concordant with the outer circumference surface of described ring resistance sheet.
5. the low-voltage distributing line spool-type lightning protection insulator having guest performer's discharging gap according to Claims 2 or 3, it is characterized in that: the first insulation distance of the formation between the internal side diameter of the external cylindrical surface of described resistor disc assembly and the outer circumference surface of described ring resistance sheet is more than or equal to the thickness of described ring resistance sheet, and the second insulation distance formed between the inner cylinder face of described resistor disc assembly and the inner peripheral surface of described ring resistance sheet is more than or equal to the thickness of described ring resistance sheet.
6. the low-voltage distributing line spool-type lightning protection insulator having guest performer's discharging gap according to claim 1, is characterized in that: described fastening bolt comprise the screw rod running through described porcelain piece and described resistor disc assembly, the two ends being threaded onto described screw rod respectively and by described porcelain piece and described resistor disc assembly clamping two nuts.
7. the low-voltage distributing line spool-type lightning protection insulator having guest performer's discharging gap according to claim 1, is characterized in that: on its cross-arm being installed on low-voltage distributing line or on anchoring; Described cross-arm or described anchoring are connected with described fastening bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310074125.4A CN103151124B (en) | 2013-03-08 | 2013-03-08 | Spool-type lightning insulator for low-voltage distribution line with external series spark gap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310074125.4A CN103151124B (en) | 2013-03-08 | 2013-03-08 | Spool-type lightning insulator for low-voltage distribution line with external series spark gap |
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| CN103956239A (en) * | 2014-05-13 | 2014-07-30 | 国家电网公司 | Lightning protection insulator protector |
| CN113270238B (en) * | 2021-06-08 | 2022-08-09 | 广东电网有限责任公司 | Low-voltage insulator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202196623U (en) * | 2010-12-17 | 2012-04-18 | 杨国安 | Puncture type lightning protection composite insulator |
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