CN103151126B - For the overvoltage protector of 220V or 380V AC electric power systems - Google Patents
For the overvoltage protector of 220V or 380V AC electric power systems Download PDFInfo
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- CN103151126B CN103151126B CN201310078286.0A CN201310078286A CN103151126B CN 103151126 B CN103151126 B CN 103151126B CN 201310078286 A CN201310078286 A CN 201310078286A CN 103151126 B CN103151126 B CN 103151126B
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Abstract
The invention discloses the overvoltage protection device for distribution low-voltage side or user side that the low and through-current capability of a kind of residual voltage ratio is large.It comprises core body, the second nonlinear resistance in composite sheath, the frequency-selecting gap discharge circuit that the impedance branch parallel connection that core body comprises insulating sleeve, insulation spacer block, electrode slice, the first nonlinear resistance, inductance, conduction spring and conducting strip are also connected in series by gap branch road and inductance, the first nonlinear resistance thus in composite sheath between high-pressure bolt with the second nonlinear resistance is formed.When the present invention normally runs, in high resistance between high-pressure bolt and earth stud, the leakage current flowing through this circuit is very little even to go to zero, and during lightning impulse, discharging gap discharges, and lightning current imports the earth by the second nonlinear resistance, earth stud.Residual voltage ratio parameter of the present invention compared with low, through-current capability is strong and leakage current is little, long service life, thus substantially increases the level of protection to distribution low-voltage side power equipment or user side electric equipment.
Description
Technical field
The present invention relates to a kind of lightning arrester, particularly a kind of for the overvoltage protection device in 220V or 380V AC electric power systems.
Background technology
Before 20th century, the research work of the overvoltage protection device in 220V/380V AC electric power systems is not too paid attention to.Therefore, present many distribution low-voltage sides do not have overvoltage protection at all, and built on stilts low-voltage circuit user side is all the more so; substantially without lightning protection measures, even if lightning arrester is equipped with in distribution low-voltage side, or lightning arrester is also equipped with in user side; but all because insulation coordination is improper, cause lightening hazard frequently to occur.Damage to crops caused by thunder, except causing power transmission and transformation high-tension apparatus and damaging, equally also affects the operation of low-voltage distribution system, causes low-voltage customer to have a power failure, and damages electric equipment, even jeopardizes personal safety.
From GB " GB11032-2010 " alternating current gapless metal oxide arrester the 110th page of typical low voltage surge arrester parameter, the rated voltage of known 220V/380V low voltage surge arrester is 0.28kV (effective value); Continuous operating voltage is 0.24kV (effective value); Direct current 1mA reference voltage is 0.6kV; It is 1.3kV (peak value) that 1.5KA lightning current impacts residual voltage, its,
Residual voltage ratio=1.5kA lightning current impacts residual voltage/direct current 1mA reference voltage=1.3/0.6=2.16
In prior art; the product type meeting this standard is YH1.5W-0.28/1.3; this product can make the overvoltage protection of distribution low-voltage side; but because the insulation level of its distribution low-voltage side is usually all higher than the insulation level of user side electrical equipment; therefore; user side electrical equipment, as the drive circuit of the LED street lamp of household electrical appliances, office computer, facsimile machine and city illumination, is usually subject to lightning impulse and damages.
At present, both at home and abroad for the overvoltage protector of Low-voltage Electronic electric equipment, gapless piezoresistive wafer is mostly adopted to make overvoltage protector (i.e. lightning arrester).This overvoltage protector, in the technical requirement situation meeting " GB11032-2010 ", also exists following not enough:
1) under nominal lightning current impacts, its residual voltage ratio parameter is higher, causes level of protection lower;
2) leakage current is comparatively large, piezoresistive wafer aging speed is fast, useful life is shorter;
3), after lightning impulse, power frequency continued flow easily makes piezo-resistance occur thermal runaway even combustion explosion accident.
Summary of the invention
The technical problem to be solved in the present invention is to provide the large overvoltage protection device for distribution low-voltage side or user side of the low and through-current capability of a kind of residual voltage ratio.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
Overvoltage protector for 220V or 380V AC electric power systems of the present invention, comprise by full skirt cover, coaxial setting and the composite sheath formed with the insulating cylinder of its inwall close proximity is overlapped with full skirt, at composite sheath inner high voltage bolt, core body, second nonlinear resistance, connect negative spring, bottom insulation seal cover and with connect negative spring interface and the earth stud stretched out through bottom insulation seal cover is connected successively, described core body comprises insulating sleeve, insulation spacer block, electrode slice, first nonlinear resistance, inductance, conduction spring and conducting strip and thus in composite sheath between high-pressure bolt and the second nonlinear resistance by gap branch road and inductance, the frequency-selecting gap discharge circuit of the impedance branch parallel connection formation of the first nonlinear resistance serial connection, one end of this frequency-selecting gap discharge circuit connects with high-pressure bolt, its other end connects with the second nonlinear resistance, the mode parallel connection that described second nonlinear resistance is above connected in series in the form by three-piece metal oxide non-linear resistor is formed.
Described insulating sleeve is the first insulating sleeve of coaxial setting from top to bottom, second insulating sleeve, 3rd insulating sleeve and the 4th insulating sleeve, described insulation spacer block is the first insulation spacer block, second insulation spacer block and the 3rd insulation spacer block, wherein, first insulation spacer block is placed in the first insulating sleeve, combine closely therebetween, the screwed hole that closely can screw with high-pressure bolt is provided with in the central authorities of the first insulation spacer block end face, second insulation spacer block is annulus post shapes, it is arranged between the second insulating sleeve and the 3rd insulating sleeve, 3rd insulation spacer block is stepped cylindrical body, it is arranged in the 4th insulating sleeve, combine closely therebetween,
The first electrode slice in the branch road of described gap is placed in the bottom in the second insulating sleeve and connects with one end of the first conducting strip, and the other end of the first conducting strip stretches out the second insulating sleeve and to be close to and the outer wall passing the second insulating sleeve and the first insulating sleeve connects with high-pressure bolt;
Second electrode slice is placed in the top of the 3rd insulating sleeve and connects with one end of the 3rd conducting strip, the other end of the 3rd conducting strip stretches out the 3rd insulating sleeve and to be close to and the outer wall passing the 3rd insulating sleeve and the 4th insulating sleeve connects with the second nonlinear resistance, bottom electrode on top electrode on first electrode slice and the second electrode slice is each passed through the centre bore on the first conducting strip and the 3rd conducting strip that connect with it, in the endoporus of the second insulation spacer block annulus post, form gap;
Inductance in described impedance branch is placed in the second insulating sleeve, its lower end is connected with the first electrode slice and is connected with high-pressure bolt by the first conducting strip, its upper end is connected with the second nonlinear resistance by upper conduction spring, the second conducting strip, the first described nonlinear resistance, lower conduction spring, the second electrode slice and the 3rd conducting strip, wherein, the part of the second conducting strip passes the second insulating sleeve and outer wall along the second insulating sleeve and the 3rd insulating sleeve is arranged.
Described first conducting strip is made up of with the rectangular tie being connected two ring belts a great circle girdle, a small circle gridle, and small circle gridle is nested with and is connected on high-pressure bolt, and great circle girdle to ride on the second insulation spacer block and is connected with the first electrode slice.
Described 3rd conducting strip is made up of with the rectangular knob sheet be connected therebetween a great circle ring plate, a roundlet disc, roundlet disc is placed in the bottom of the 3rd insulation spacer block and connects with the second described nonlinear resistance, and great circle ring plate is placed in the bottom of the second insulation spacer block and is connected with the second electrode slice.
The central angle that the part that described first conducting strip, the second conducting strip and the 3rd conducting strip are arranged along the first insulating sleeve, the second insulating sleeve, the 3rd insulating sleeve or the 4th insulating sleeve outer wall is formed each other is spent 45-270.
Wall thickness bottom described insulating cylinder is large compared with the wall thickness of the other parts on it.
Be provided with in the side of described bottom insulation seal cover along the axially extended raised line of described insulating cylinder, position corresponding with described raised line on the inwall of described insulating cylinder is provided with the groove that described raised line is inserted, and combines closely therebetween.
Described first nonlinear resistance is metal oxide varistors sheet, and the specification of described metal oxide varistors sheet is Φ 33 × 2.
Described conducting strip is made up of red copper material, and described top electrode and bottom electrode are made by brass band punching press, and its shape is truncated cone-shaped, and the thickness of brass band is at 0.3-1.0mm.
The thickness of described brass band is 0.5mm.
Compared with prior art, the present invention adopts the structure of frequency-selecting gap discharge circuit between composite sheath inner high voltage bolt and the second nonlinear resistance, make the present invention under normal operation, high resistance is presented between high-pressure bolt and earth stud, the leakage current flowing through this circuit is very little even to go to zero, and also makes greatly increase its useful life thus, when the present invention is subject to lightning impulse, because inductive current in frequency-selecting gap discharge circuit can not suddenly change and the characteristic of its voltage leading current 90 degree, and this voltage is put on this circuit gap, thus discharging gap is discharged, now, impedance branch is short circuit because of gap discharge, namely the electric current flowing through impedance branch is zero, lightning current is by the second nonlinear resistance, earth stud imports the earth, because the second nonlinear resistance is that the parallel connection of multi-disc metal oxide varistors sheet is formed, its through-current capability improves greatly, during electric discharge, impose on the residual voltage at the second nonlinear resistance two ends relative to lower under the first nonlinear resistance and the second nonlinear resistance series connection situation.In view of said structure, residual voltage ratio parameter of the present invention compared with low, through-current capability is strong and leakage current is little, long service life, thus substantially increases the level of protection to distribution low-voltage side power equipment or user side electric equipment.In addition, the present invention arranges guide frame and thickens the wall thickness of this SI semi-insulation cylinder on the side of sealed bottom lid and corresponding insulating cylinder inwall, and make the present invention when unexpected thermal runaway, the ability that the automatic slewing of earth stud departs from strengthens.
Accompanying drawing explanation
Fig. 1 is that schematic diagram cuts open in office of the present invention.
Fig. 2 is core body schematic diagram of the present invention.
Fig. 3 is A-A cutaway view in Fig. 2.
Fig. 4 be in Fig. 2 B to schematic diagram.
Fig. 5 be in Fig. 2 C to schematic diagram.
Fig. 6 be in Fig. 2 D to schematic diagram.
Fig. 7 is the present invention first conducting strip schematic diagram.
Fig. 8 is the present invention second conducting strip schematic diagram.
Fig. 9 is the present invention the 3rd conducting strip schematic diagram.
Figure 10 is equivalent circuit theory figure in composite sheath of the present invention.
Figure 11 is the structural representation of the present invention second nonlinear resistance.
Figure 12 is the red copper brace schematic diagram in Figure 11.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Reference numeral is as follows:
Composite sheath 1, full skirt cover 11, full skirt 111, insulating cylinder 12, upper cover 13, lower cover 14, clamp nut 15, high-pressure bolt 2, top insulated enclosure lid 3 (the first namely following insulation spacer block 421), screwed hole 31, core body 4, insulating sleeve 41, first insulating sleeve 411, second insulating sleeve 412, 3rd insulating sleeve 413, 4th insulating sleeve 414, insulation spacer block 42, first insulation spacer block 421 (namely above-mentioned top insulated enclosure lid 3), second insulation spacer block 422, endoporus 4221, 3rd insulation spacer block 423, electrode slice 43, first electrode slice 431, second electrode slice 432, contact ring 433, top electrode 434, bottom electrode 435, conduction spring 44, upper conduction spring 441, lower conduction spring 442, conducting strip 45, first conducting strip 451, great circle girdle 4511, small circle gridle 4512, rectangular tie 4513, second conducting strip 452, circular discs 4521, connecting band 4522, 3rd conducting strip 453, great circle ring plate 4531, roundlet disc 4532, rectangular knob sheet 4533, centre bore 454, guiding groove 46, connect negative spring 5, bottom insulation seal cover 6, earth stud 7, red copper brace 8, metal oxide varistors sheet 9, clearance G, inductance L, first nonlinear resistance R1, second nonlinear resistance R2.
As shown in Figure 1, the present invention is used for the overvoltage protector of 220V or 380V AC electric power systems, comprise the composite sheath 1 be made up of full skirt cover 11 and barrel-shaped insulating cylinder 12, full skirt cover 11 is made up of the silicon rubber that hydrophobicity is strong, the full skirt 111 of the improved external flashover voltage 11 outer walls being evenly provided with radially evagination is from top to bottom overlapped at full skirt, insulating cylinder 12 and full skirt overlap 11 and coaxially arrange, close proximity therebetween, described insulating cylinder 12 is high by intensity, good insulating and the low PBT material of water absorption make (PBT, English full name polybutylene terephthalate, Chinese name: polybutylene terephthalate, belong to polyester series, there is thermal endurance, weatherability, resistance to chemical reagents, electrical characteristic is good, water absorption is little, the features such as gloss is good).
As shown in Figure 1, from top to bottom be provided with in composite sheath 1 connect with outside line high-pressure bolt 2, core body 4, second nonlinear resistance R2, connect negative spring 5, bottom insulation seal cover 6 and with connect negative spring 5 and connect and pass the earth stud 7 that bottom insulation seal cover 6 stretches out, also be respectively equipped with the upper cover 13 be tightly connected with composite sheath 1 and lower cover 14 that are made by stainless steel material on the top of composite sheath 1 and bottom, fluid sealant used is epoxy resin therebetween.
It is made that described high-pressure bolt 2 and earth stud 7 are stainless steel material, on it, all cover has clamp nut 15, the outer end of high-pressure bolt 2 is connected to the high-voltage line on distribution low-voltage side or user's side line road, and its inner upper cover 13 that passes is rotatably connected on composite sheath 1 inner top insulated enclosure lid 3; The shape of earth stud 7 is "T"-shaped, its outer end is "T"-shaped vertical part, this end is connected to the earth terminal on distribution low-voltage side or user's side line road through lower cover 14 and described bottom insulation seal cover 6, its the inner is "T"-shaped transverse part, be placed in composite sheath 1 with connect negative spring 5 and connect, described clamp nut 15 is rotatably connected on the outer surface of described upper cover 13 or lower cover 14.
Be contained in the insulating sleeve 41 in core body 4, top insulated enclosure lid 3 and bottom insulation seal cover 6 to make by PBT material, between itself and insulating cylinder 12 inwall of composite sheath 1, form seal cavity.
Described second nonlinear resistance R2 is made up of with the mode parallel connection that structure is connected in series three-piece metal oxide non-linear resistor 9, this metal oxide varistors sheet can be zinc oxide nonlinear resistance slice, also can be carborundum resistor disc, it can also be piezoresistive wafer, as shown in Figure 11,12, the connected mode of three-piece metal oxide non-linear resistor 9 is in parallel by the metal oxide varistors sheet 9 that three specifications are Φ 33 × 2 by two identical red copper braces 8.Often open red copper brace 8 to be made up of in flakes with the strip being connected two disks two disks, wherein, a disk of first red copper brace 8 connects with the end face of the first metal oxide varistors sheet 9 in the second nonlinear resistance R2, and its another disk connects with the bottom surface of second metal oxide varistors sheet 9 and the end face of three-piece metal oxide non-linear resistor 9; A disk of second red copper brace 8 connects with the bottom surface of first metal oxide varistors sheet 9 in the second nonlinear resistance R2 and the end face of second metal oxide varistors sheet 9, and its another disk connects with the bottom surface of three-piece metal oxide non-linear resistor 9; The end (i.e. the bottom surface of described three-piece metal oxide non-linear resistor 9) that goes out of this second nonlinear resistance R2 is electrically connected with "T"-shaped earth stud 7 by connecing negative spring 5.This syndeton when composite sheath 1 internal diameter is certain, can makes the diameter of metal oxide varistors sheet 9 located therein large as far as possible, thus improves its through-current capability.
As Fig. 2, shown in 3, described core body 4 comprises insulating sleeve 41, insulation spacer block 42, electrode slice 43, first nonlinear resistance R1, inductance L, conduction spring 44 and conducting strip 45, the equivalent electric circuit that these parts adopt connected mode described later to be formed is: in composite sheath 1, form a frequency-selecting gap discharge circuit (see accompanying drawing 10) between high-pressure bolt 2 and the second nonlinear resistance R2, one end of this frequency-selecting gap discharge circuit connects with high-pressure bolt 2, its other end enters to hold with the second nonlinear resistance R2, and (end face of namely described first metal oxide varistors sheet 9) connects, this circuit is made up of two branch circuit parallel connections, article one, branch road is that the clearance G that formed by two electrode slices 43 and conducting strip 45 are connected in series the gap branch road formed, another branch road is by inductance L, first nonlinear resistance R1, conducting strip 45 and conduction spring 44 are connected in series the impedance branch formed.
As shown in Fig. 2,3,4,5,6, described insulating sleeve 41 is made by PBT material, its shape for coaxial setting is from top to bottom barrel-shaped the first insulating sleeve 411, second insulating sleeve 412, the 3rd insulating sleeve 413 and the 4th insulating sleeve 414, and the outer wall often saving insulating sleeve 41 is equipped with the guiding groove 46 inwardly concaved.
Described insulation spacer block 42 is also made by PBT material, and it is the first insulation spacer block 421, second insulation spacer block 422 and the 3rd insulation spacer block 423, and wherein, the first insulation spacer block 421 is placed in the first insulating sleeve 411, combines closely therebetween; The screwed hole 31 that closely can screw with high-pressure bolt 2 is provided with in the central authorities of the first insulation spacer block 421 end face, second insulation spacer block 422 is annulus post shapes, it is arranged between the second insulating sleeve 412 and the 3rd insulating sleeve 413, and its external diameter is identical with the external diameter of the 3rd insulating sleeve 413 with the second insulating sleeve 412; 3rd insulation spacer block 423 is stepped cylindrical body, and it is arranged in the 4th insulating sleeve 414, combines closely therebetween.
The connected mode of described gap branch road is as follows:
1) the first electrode slice 431 is wherein placed in the bottom in the second insulating sleeve 412, its shape is discoid, multiple contact rings 433 of evagination extension are vertically provided with at its periphery, centre is provided with the top electrode 434 for discharging extended with convex with contact ring 433 wherein, and described contact ring 433 connects with the first conducting strip 451.As shown in Figure 7, first conducting strip 451 is made up of a great circle girdle 4511, small circle gridle 4512 and the rectangular tie 4513 be connected between two ring belts, great circle girdle 4511 bottom surface rides on the second insulation spacer block 422, its end face connects with described contact ring 433, and the small circle gridle 4512 of the first conducting strip 451 stretches out the second insulating sleeve 412 and to be close in the mode that its rectangular tie 4513 is placed in described guiding groove 46 and the outer wall passing the second insulating sleeve 412 and the first insulating sleeve 411 is nested with and is connected on high-pressure bolt 2;
2) the second electrode slice 432 shape is wherein identical with the first electrode slice 431, its top be placed in the 3rd insulating sleeve 413 to ride on lower conduction spring 442 and connects with the 3rd conducting strip 453, and the top electrode 434 on the bottom electrode 435 on it, contact ring 433 and the first electrode slice 431, contact ring 433 are oppositely arranged.As shown in Figure 9,3rd conducting strip 453 is made up of with the rectangular knob sheet 4533 be connected therebetween a great circle ring plate 4531, roundlet disc 4532, the end face of great circle ring plate 4531 is close to the bottom surface of the second insulation spacer block 422, its bottom surface connects with the contact ring 433 on the second electrode slice 432, and the roundlet disc 4532 of the 3rd conducting strip 453 stretches out the 3rd insulating sleeve 413 and to be close in the mode that its rectangular knob sheet 4533 is placed in described guiding groove 46 and the outer wall passing the 3rd insulating sleeve 413 and the 4th insulating sleeve 414 connects with the end that enters of the second described nonlinear resistance R2;
3) top electrode 434 on the first electrode slice 431 and the bottom electrode 435 on the second electrode slice 432 are each passed through the centre bore 454 on the first conducting strip 451 and the 3rd conducting strip 453 that connect with it, in the endoporus 4221 of the second insulation spacer block 422 annulus post, form clearance G.
Described top electrode 434 and bottom electrode 435 are stamped to form by brass band, and its shape is truncated cone-shaped, and the thickness of brass band, at 0.3-1.0mm, is preferably 0.5mm.
The connected mode of described impedance branch is as follows:
1) inductance L in impedance branch is placed in the second insulating sleeve 412, its lower end is connected with the first electrode slice 431 and is connected with high-pressure bolt 2 by the first conducting strip 451, its upper end is by upper conduction spring 441, second conducting strip 452, the first described nonlinear resistance R1, lower conduction spring 442, second electrode slice 432 and the 3rd conducting strip 453 connect with the end that enters of the second nonlinear resistance R2, wherein, as shown in Figure 8, the shape of the second conducting strip 452 is be made up of two identical circular discs 4521 and connecting band 4522 therebetween, two circular discs 4521 connect with upper conduction spring 441 and the first nonlinear resistance R1 respectively, connecting band 4522 stretches out the 3rd insulating sleeve 413 and is placed in described guiding groove 46 and is close to and passes the 3rd insulating sleeve 413, the outer wall of the second insulation spacer block 422 and the second insulating sleeve 412 is arranged.
2) in order to reach better insulation effect, described first conducting strip 451, second conducting strip 452 and the 3rd conducting strip 453 are along the first insulating sleeve 411, second insulating sleeve 412, the rectangular tie 4513 that 3rd insulating sleeve 413 or the 4th insulating sleeve 414 outer wall are arranged, rectangular knob sheet 4533 and formed each other central angle of connecting band 4522 are at 45-270 degree, central angle between rectangular tie 4513 and rectangular knob sheet 4533 is preferably 90 degree, central angle between rectangular knob sheet 4533 and connecting band 4522 is preferably 90 degree, central angle between connecting band 4522 and rectangular tie 4513 is preferably 180 degree and (refers to Fig. 4, 5, 6).
3) the metal oxide varistors sheet 9 of the first nonlinear resistance R1 to be a slice specification be Φ 33 × 2, or for multi-disc specification be the metal oxide varistors sheet 9 of Φ 33 × 2 resistor disc group in series.
Described first conducting strip 451, second conducting strip 452 and the 3rd conducting strip 453 are made by copper belt, and the thickness of copper belt is 0.3mm.
Described upper conduction spring 441 and lower conduction spring 442 are turriform spring, and it also plays the degree of balance effect regulated with its interface member except playing electric action.
As shown in Figure 1, further improvement of the present invention is that the barrel being positioned at the second nonlinear resistance R2 side bottom insulating cylinder 12 is made the structure large compared with the wall thickness of insulating cylinder 12 other parts, institute's buildup thickness is at 3-5mm, preferred 3mm, the axial length of thickening should be longer than the distance entered between end to earth stud 7 of the second nonlinear resistance R2, like this, the explosion-proof intensity of reinforced insulation cylinder 12 is conducive to.
An improvement more of the present invention arranges guide frame between the lateral surface and insulating cylinder 12 inwall of described sealed bottom lid, this guide frame is be arranged on sealed bottom lid lateral surface to insert and close-fitting groove along the axially extended raised line of insulating cylinder 12 with the described raised line that makes arranged on the position that insulating cylinder 12 inwall is corresponding with raised line, so, make the present invention when the extra-heavy seasonal second nonlinear resistance R2 flashover of thunderbolt or aging regression produce thermal runaway, sealed bottom lid can be carried "T"-shaped earth stud 7 and outwards go out by bottom it along insulating cylinder 12 axis direction by the high temperature and high pressure gas produced by the second nonlinear resistance R2, make the connection of the automatic slewing disengaging of earth stud 7 and composite sheath 1, thus avoid the generation of the comminuted blast of composite sheath 1 or permanent earth accident.
Each part dimension size in structure of the present invention and electric parameter are adjustable; the size of its residual voltage ratio that can require according to overvoltage protector, through-current capability and life of product length; the corresponding size of associated components, electric parameter are regulated, thus meets the demand of user.
The assembling of overvoltage protector of the present invention:
One, the assembling of core body 4
1) location and installation support is made;
2) the 3rd insulation spacer block 423 is placed in the 4th insulating sleeve 414, coats Instant cement in its junction;
3) Instant cement is coated in the bottom of the 3rd insulation spacer block 423 and top, roundlet disc 4532 on 3rd conducting strip 453 is pasted on the bottom of the 3rd insulation spacer block 423, a circular discs 4521 on second conducting strip 452 is pasted on the top of the 3rd insulation spacer block 423, then the first nonlinear resistance R1 is placed on the second conducting strip 452;
4) be placed on the 4th insulating sleeve 414 by the 3rd insulating sleeve 413, its joining place bonds, and is placed on the first nonlinear resistance R1 by lower conduction spring 442, then is placed on lower conduction spring 442 by the second electrode slice 432 in bottom electrode 435 mode upwards;
5) spacer block 422 that insulate second is placed on the 3rd insulating sleeve 413 and also descends two surfaces to coat Instant cement thereon, again the great circle ring plate 4531 on the 3rd conducting strip 453 is pasted on the lower surface of the second insulation spacer block 422, the great circle girdle 4511 of the first conducting strip 451 is pasted on the upper surface of the second insulation spacer block 422;
6) the second insulating sleeve 412 is placed on the second insulation spacer block 422, bond therebetween, again the first electrode slice 431 is placed on the great circle girdle 4511 of the first conducting strip 451 with top electrode 434, mode that bottom electrode 435 is relative, then inductance L is positioned on the first electrode slice 431;
7) place in inductance L and conduct electricity spring 441, the upper end of upper conduction spring 441 connects with another circular discs 4521 on the second conducting strip 452;
8) the first insulating sleeve 411 is placed on the second insulating sleeve 412, its joining place bonds, Instant cement is coated in the side of the first insulation spacer block 421 and top and bottom, be pressed in the first insulating sleeve 411 again, its lower surface is mutually bonding with another circular discs 4521 described on the second conducting strip 452, its side is mutually bonding with the inwall of the first insulating sleeve 411, and its upper surface is mutually bonding with the small circle gridle 4512 on the first conducting strip 451.
Two, overall assembling
1) core body 4 will assembled, coats epoxy resin at its outer wall and loads in composite sheath 1 with the first insulating sleeve 411 in upper mode, put into the drying in oven of 70 degree in the lump;
2) the second nonlinear resistance R2 is put into the composite sheath after stoving process 1 by the bottom of composite sheath 1;
3) negative spring 5, "T"-shaped earth stud 7 and bottom insulation seal cover 6 will be connect again loaded by composite sheath 1 bottom, and on the side and coated on bottom side of bottom insulation seal cover 6 epoxy sealing, described lower cover 14 is close to bottom insulation seal cover 6 and is placed in 70 degree of drying in oven;
4) described upper cover 13 is close to the small circle gridle 4512 of the first conducting strip 451, again the lower end of high-pressure bolt 2 is screwed in the screwed hole 31 on the first insulation spacer block 421 end face through upper cover 13, small circle gridle 4512, screw the nut be nested with on high-pressure bolt 2.
Operation principle of the present invention
1) when normally running:
The present invention is the structure adopting frequency-selecting gap discharge circuit between composite sheath 1 inner high voltage bolt 2 and the second nonlinear resistance R2; as previously mentioned; high resistance state is presented between high-pressure bolt 2 and earth stud 7; thus; the current in resistance property making to flow through this overvoltage protector is very little even to go to zero, and thus extends its useful life.
2) during lightning impulse:
Frequency-selecting gap discharge circuit is made up of gap branch road and impedance branch parallel connection, wherein impedance branch be by inductance L and the first nonlinear resistance R1 in series, when lightning impulse moment, can not suddenly change and the characteristic of voltage leading current 90 degree because the inductance L in impedance branch has electric current, thus the overvoltage between gap is put on, force clearance G disruptive discharge, no current in impedance branch is flow through, now, lightning current through clearance G, the second nonlinear resistance R2, connect negative spring 5 and "T"-shaped earth stud 7 and import the earth.
Because the second nonlinear resistance R2 is that the parallel connection of multi-disc metal oxide varistors sheet is formed, its through-current capability is strong, during electric discharge, imposes on the residual voltage at the second nonlinear resistance R2 two ends relative to low during the first nonlinear resistance R1 and the second nonlinear resistance R2 series connection.
3) by the definition of said structure and residual voltage ratio, the present invention has that residual voltage ratio parameter is lower, level of protection is high, through-current capability is strong, the normal advantage such as current in resistance property little and long service life when running.
Relevant test data of the present invention
Assemble 13, entrust Wuhan State Network Electric Power Research Institute arrester checks center to do pattern test, result of the test is:
1) 2ms square wave discharge capacity 150A is by 18 times;
2) direct current 1mA reference voltage is 880V;
3) 250A, 500A, 1000A, 1500A, 3000A and 5000A is made, 8/20us lightning impulse residual voltage, wherein the impact Can Ya≤800V of 1500A;
4) overvoltage protector of the present invention is in parallel with the LED illumination lamp of the 1500W that Taiwan businessman provides, after making the lightning impulse test 18 times of 8/20 μ s1500A, its result: this LED illumination lamp and overvoltage protection device of the present invention all excellent.
Claims (10)
1. the overvoltage protector for 220V or 380V AC electric power systems, comprise by full skirt cover (11), arrange and the composite sheath (1) formed with the insulating cylinder (12) of its inwall close proximity with full skirt cover (11) is coaxial, at composite sheath (1) inner high voltage bolt (2), core body (4), second nonlinear resistance (R2), connect negative spring (5), bottom insulation seal cover (6) and with connect negative spring (5) and connect and pass the earth stud (7) that bottom insulation seal cover (6) stretches out and be connected successively, it is characterized in that: described core body (4) comprises insulating sleeve (41), insulation spacer block (42), electrode slice (43), first nonlinear resistance (R1), inductance (L), conduction spring (44) and conducting strip (45) and thus in composite sheath (1) between high-pressure bolt (2) and the second nonlinear resistance (R2) by gap branch road and inductance (L), the frequency-selecting gap discharge circuit that the impedance branch parallel connection that first nonlinear resistance (R1) is connected in series is formed, one end of this frequency-selecting gap discharge circuit connects with high-pressure bolt (2), its other end connects with the second nonlinear resistance (R2), the mode parallel connection that described second nonlinear resistance (R2) is above connected in series in the form by three-piece metal oxide non-linear resistor (9) is formed.
2. the overvoltage protector for 220V or 380V AC electric power systems according to claim 1, it is characterized in that: described insulating sleeve (41) is first insulating sleeve (411) of coaxial setting from top to bottom, second insulating sleeve (412), 3rd insulating sleeve (413) and the 4th insulating sleeve (414), described insulation spacer block (42) is the first insulation spacer block (421), second insulation spacer block (422) and the 3rd insulation spacer block (423), wherein, first insulation spacer block (421) is placed in the first insulating sleeve (411), combine closely therebetween, the screwed hole (31) that closely can screw with high-pressure bolt (2) is provided with in the central authorities of the first insulation spacer block (421) end face, second insulation spacer block (422) is annulus post shapes, it is arranged between the second insulating sleeve (412) and the 3rd insulating sleeve (413), 3rd insulation spacer block (423) is stepped cylindrical body, it is arranged in the 4th insulating sleeve (414), combine closely therebetween,
The first electrode slice (431) in the branch road of described gap is placed in the bottom in the second insulating sleeve (412) and connects with one end of the first conducting strip (451), and the other end of the first conducting strip (451) stretches out the second insulating sleeve (412) and to be close to and the outer wall passing the second insulating sleeve (412) and the first insulating sleeve (411) connects with high-pressure bolt (2);
Second electrode slice (432) is placed in the top of the 3rd insulating sleeve (413) and connects with one end of the 3rd conducting strip (453), the other end of the 3rd conducting strip (453) stretches out the 3rd insulating sleeve (413) and to be close to and the outer wall passing the 3rd insulating sleeve (413) and the 4th insulating sleeve (414) connects with the second nonlinear resistance (R2), top electrode (434) on first electrode slice (431) and the bottom electrode (435) on the second electrode slice (432) are each passed through the centre bore (454) on the first conducting strip (451) and the 3rd conducting strip (453) that connect with it, gap (G) is formed in the endoporus (4221) of the second insulation spacer block (422) annulus post,
Inductance (L) in described impedance branch is placed in the second insulating sleeve (412), its lower end is connected with the first electrode slice (431) and is connected with high-pressure bolt (2) by the first conducting strip (451), its upper end is by upper conduction spring (441), second conducting strip (452), described the first nonlinear resistance (R1), lower conduction spring (442), second electrode slice (432) and the 3rd conducting strip (453) connect with the second nonlinear resistance (R2), wherein, the part of the second conducting strip (452) passes the second insulating sleeve (412) and outer wall along the second insulating sleeve (412) and the 3rd insulating sleeve (413) is arranged.
3. the overvoltage protector for 220V or 380V AC electric power systems according to claim 2; it is characterized in that: described first conducting strip (451) is made up of with the rectangular tie (4513) being connected two ring belts a great circle girdle (4511), a small circle gridle (4512); small circle gridle (4512) is nested with and is connected on high-pressure bolt (2), and great circle girdle (4511) rides in the second insulation spacer block (422) and goes up and be connected with the first electrode slice (431).
4. the overvoltage protector for 220V or 380V AC electric power systems according to claim 2; it is characterized in that: described 3rd conducting strip (453) is made up of with the rectangular knob sheet (4533) be connected therebetween a great circle ring plate (4531), a roundlet disc (4532); roundlet disc (4532) is placed in the bottom of the 3rd insulation spacer block (423) and connects with described the second nonlinear resistance (R2), and great circle ring plate (4531) is placed in the bottom of the second insulation spacer block (422) and is connected with the second electrode slice (432).
5. the overvoltage protector for 220V or 380V AC electric power systems according to claim 2, is characterized in that: the central angle that the part that described first conducting strip (451), the second conducting strip (452) and the 3rd conducting strip (453) are arranged along the first insulating sleeve (411), the second insulating sleeve (412), the 3rd insulating sleeve (413) or the 4th insulating sleeve (414) outer wall is formed each other is spent 45-270.
6. the overvoltage protector for 220V or 380V AC electric power systems according to any one of claim 1-5, is characterized in that: the wall thickness of described insulating cylinder (12) bottom is large compared with the wall thickness of the other parts on it.
7. the overvoltage protector for 220V or 380V AC electric power systems according to any one of claim 1-5; it is characterized in that: be provided with along described insulating cylinder (12) axially extended raised line in the side of described bottom insulation seal cover (6); position corresponding with described raised line on the inwall of described insulating cylinder (12) is provided with the groove that described raised line is inserted, and combines closely therebetween.
8. the overvoltage protector for 220V or 380V AC electric power systems according to any one of claim 1-5; it is characterized in that: described first nonlinear resistance (R1) is metal oxide varistors sheet (9), and the specification of described metal oxide varistors sheet (9) is Φ 33 × 2.
9. the overvoltage protector for 220V or 380V AC electric power systems according to any one of claim 2-5; it is characterized in that: described conducting strip (45) is made up of red copper material; described top electrode (434) and bottom electrode (435) are made by brass band punching press; its shape is truncated cone-shaped, and the thickness of brass band is at 0.3-1.0mm.
10. the overvoltage protector for 220V or 380V AC electric power systems according to claim 9, is characterized in that: the thickness of described brass band is 0.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310078286.0A CN103151126B (en) | 2013-03-12 | 2013-03-12 | For the overvoltage protector of 220V or 380V AC electric power systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310078286.0A CN103151126B (en) | 2013-03-12 | 2013-03-12 | For the overvoltage protector of 220V or 380V AC electric power systems |
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| Publication Number | Publication Date |
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| CN103151126A CN103151126A (en) | 2013-06-12 |
| CN103151126B true CN103151126B (en) | 2015-09-30 |
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| CN201310078286.0A Expired - Fee Related CN103151126B (en) | 2013-03-12 | 2013-03-12 | For the overvoltage protector of 220V or 380V AC electric power systems |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578030A (en) * | 2014-12-19 | 2015-04-29 | 苏州汉克山姆照明科技有限公司 | Lightning arrester for outdoor lamp |
| CN104538943A (en) * | 2014-12-19 | 2015-04-22 | 苏州汉克山姆照明科技有限公司 | Arrester installation structure |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1102904A (en) * | 1993-09-06 | 1995-05-24 | Abb管理有限公司 | Over voltage protecting discharger |
| CN200950428Y (en) * | 2006-09-25 | 2007-09-19 | 深圳市银星电力电子有限公司 | Novel frequency division shunting separator |
| CN201307768Y (en) * | 2008-06-16 | 2009-09-09 | 陕西蓝河电气工程有限公司 | Special lightning protection wave trapper for a power distribution transformer |
| CN101656131A (en) * | 2009-09-24 | 2010-02-24 | 唐圣严 | High tensile explosion-proof lightning protection insulator and explosion-proof lightning arrester |
| CN203205166U (en) * | 2013-03-12 | 2013-09-18 | 郑越 | Overvoltage protector applied to 220V or 380V alternating-current power system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH076907A (en) * | 1993-06-18 | 1995-01-10 | Toshiba Corp | Tank-shaped lightning arrester |
-
2013
- 2013-03-12 CN CN201310078286.0A patent/CN103151126B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1102904A (en) * | 1993-09-06 | 1995-05-24 | Abb管理有限公司 | Over voltage protecting discharger |
| CN200950428Y (en) * | 2006-09-25 | 2007-09-19 | 深圳市银星电力电子有限公司 | Novel frequency division shunting separator |
| CN201307768Y (en) * | 2008-06-16 | 2009-09-09 | 陕西蓝河电气工程有限公司 | Special lightning protection wave trapper for a power distribution transformer |
| CN101656131A (en) * | 2009-09-24 | 2010-02-24 | 唐圣严 | High tensile explosion-proof lightning protection insulator and explosion-proof lightning arrester |
| CN203205166U (en) * | 2013-03-12 | 2013-09-18 | 郑越 | Overvoltage protector applied to 220V or 380V alternating-current power system |
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| CN103151126A (en) | 2013-06-12 |
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