CN203311955U - Overvoltage protector for 6kV or 10kV of alternating-current power system - Google Patents
Overvoltage protector for 6kV or 10kV of alternating-current power system Download PDFInfo
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- CN203311955U CN203311955U CN201320111674XU CN201320111674U CN203311955U CN 203311955 U CN203311955 U CN 203311955U CN 201320111674X U CN201320111674X U CN 201320111674XU CN 201320111674 U CN201320111674 U CN 201320111674U CN 203311955 U CN203311955 U CN 203311955U
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Abstract
The utility model discloses a high-protection level overvoltage protector for a 6kV or 10kV of alternating-current power system, which is large in flow capacity, small in leakage current, and low in residual voltage ratio, and can efficiently and rapidly enable an earth stud to break away automatically under a strong lightning shock. The overvoltage protector comprises a core body, a second non-linear resistor, a booster inner cavity, a conductive booster platter, and a third non-linear resistor which are arranged inside a composite sleeve; a mechanism for rapidly breaking away the earth stud in thermal runaway is also arranged on a bottom insulated seal cover; a frequency selective clearance discharge circuit between a high-pressure bolt and the earth stud and inside the composite sleeve is orderly connected with the second non-linear resistor, the conductive booster platter, and the third non-linear resistor in series; the frequency selective clearance discharge circuit is formed by a clearance branch and an impedance branch in parallel. The overvoltage protector displays high resistance when normally runs; leakage current is small or even close to zero; the service life is long; and lightning current can be led into the earth through a clearance branch, the second non-linear resistor, the third non-linear resistor and the earth stud in lightning surge.
Description
Technical field
The utility model relates to a kind of lightning arrester, particularly a kind of overvoltage protection device for electric rotating machine, power station, distribution, line insulator and power capacitor.
Background technology
Overvoltage protection before nineteen seventies, generally use discharging gap, and afterwards along with scientific and technological development, the research of silicon carbide nonlinear resistor success, make overvoltage protection with regard to developing into to use with the valve type arrester of series gap.In later stage nineteen seventies, as states such as the U.S., Japan, Sweden and the former Soviet Unions, actively developed a kind of novel semiconductor resistor sheet---metal oxide varistors sheet, and obtained certain achievement.China also actively develops, and after experiencing 10 years struggles, through the bid of the backward whole world of State Council approved, in 1985, determines the production technology of Introduced from Japan Hitachi, Ltd " AC gapless metal oxide thunder device ".
Through the technological assimilation of 10 years and production, the overvoltage protector of China enters the New Times (hereinafter to be referred as zinc oxide arrester) of one " alternating current gapless metal oxide arrester ".
Zinc oxide arrester, under related scientific research unit and the technical staff's of manufacturing enterprise joint efforts, obtains fast development promotion and application in all parts of the country.
Yet also there are many problems in zinc oxide arrester in development, as protected power equipment often impaired, burn and cause power outage etc., trace it to its cause, be mainly its lightning impulse level of protection also lower.
So-called lightning impulse level of protection, the residual voltage value namely read corresponding to certain nominal discharge current on the V of zinc oxide arrester-A characteristic curve.Hence one can see that, and the residual voltage value is lower, and its level of protection is just better.
Table 1 is domestic and international typical zinc oxide arrester relevant parameter table.
Table 1:
As can be known from Table 1, the relative American Standard of the protective ratio of China's zinc oxide arrester and moral mark parameter value are high, so its level of protection is slightly poorer.As for the protective ratio under other lightning impulse current, do not have definite data to be difficult to make comparisons.
Under the 20kA lightning current impacted, the protective ratio of German zinc oxide arrester was 2.4, and the protective ratio of U.S.'s zinc oxide arrester is 2.7; Under the 40kA lightning current impacts; the protective ratio of U.S.'s zinc oxide arrester is 3.0; China's zinc oxide arrester does not have definite data comparable under 20kA and 40kA lightning impulse; but under 4/10 μ s65kA heavy current impact; its residual voltage value all is greater than 90kV; far above the insulation level 75kV of equipment, this will inevitably cause the damage of blasting of burning of power equipment or insulation flashover or zinc oxide arrester.
The protective ratio definition: lightning current impacts residual voltage/continuous operating voltage
The residual voltage ratio definition: lightning current impacts residual voltage/direct current 1mA reference voltage
At present; domestic and international overvoltage protector; mostly all adopt alternating current gapless metal oxide arrester to make overvoltage protection, though this overvoltage protector can meet the specification requirement of " GB11032-2010 " and " IEC60099-4:2006 " standard, also have following deficiency:
1) if large or while meeting strong lightning impulse at lightning current; because its residual voltage is higher; easily make protected power equipment impaired; perhaps its inner non-linear resistor punctures or flashover, will cause the zinc oxide arrester of porcelain overcoat to be blasted or Polymeric Housed MOA causes the electric power system permanent earth fault to have a power failure because its internal flashover punctures.
2) under the nominal lightning current impacted, its protective ratio or residual voltage ratio were all larger, cause level of protection lower.
3) leakage current is large, the resistor disc aging speed is fast, lightning arrester is shorter useful life.
Summary of the invention
The technical problems to be solved in the utility model is to provide that a kind of through-current capability is large, leakage current is little, residual voltage ratio is low and under strong lightning impulse, can efficiently make fast the earth stud automatic trip from the overvoltage protector of high level of protection.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is:
Overvoltage protector for 6kV or 10kV AC electric power systems of the present utility model, comprise by the full skirt cover, with full skirt cover coaxial arrange and with the composite sheath of the insulating cylinder formation of its inwall close proximity, at composite sheath inner high voltage bolt, core body, the second nonlinear resistance, the bottom insulation seal cover with pass the earth stud that the bottom insulation seal cover stretches out and be connected successively, between the second nonlinear resistance and bottom insulation seal cover, also be provided with the 3rd nonlinear resistance, and be provided with the boosting inner chamber between the second nonlinear resistance and the 3rd nonlinear resistance and/or between the 3rd nonlinear resistance and bottom insulation seal cover, in each boosting inner chamber, be provided with and make the second nonlinear resistance, the conduction boosting disc that the 3rd nonlinear resistance and earth stud are electrically connected to, the periphery of described bottom insulation seal cover is the drum extended vertically, inwall at this drum is provided with a barrel wall screw thread, on the periphery wall of the bottom of insulating cylinder, be provided with described bucket wall screw thread and can screw the also cylinder end screw thread of close fit, the thickness of the bottom insulation seal cover of described bottom insulation seal cover and the described insulating cylinder bottom face section of joining is 1/20-1/6 of insulating cylinder wall thickness, described core body comprises insulating sleeve, the insulation spacer block, electrode slice, the first nonlinear resistance, inductance, conduction spring and conducting strip, equivalent electric circuit in composite sheath between high-pressure bolt and earth stud is by frequency-selecting gap discharge circuit and the second nonlinear resistance, conduction boosting disc and the 3rd nonlinear resistance are in series, described frequency-selecting gap discharge circuit is by gap branch road and inductance, the impedance branch circuit parallel connection that the first nonlinear resistance is composed in series forms, one end and the high-pressure bolt of this equivalence circuit join, its other end and earth stud join.
On described insulating cylinder barrel, barrel thickness from described core body bottom correspondence position to part between described the 3rd nonlinear resistance bottom correspondence position than described core body bottom correspondence position more than the barrel thickness of part large, on the insulating cylinder barrel, reduce gradually from the 3rd nonlinear resistance bottom correspondence position to the barrel thickness between its bottom face.
On joining the outer face of bottom insulation seal cover corresponding to part, bottom insulation seal cover and insulating cylinder bottom face be provided with the concave ring groove that cross sectional shape is del.
Between described core body bottom face and the second nonlinear resistance upper surface, also be provided with and make the short circuit be electrically connected to turriform spring therebetween.
Described insulating sleeve is the first insulating sleeve from top to bottom coaxially arranged, the second insulating sleeve, the 3rd insulating sleeve and the 4th insulating sleeve, described insulation spacer block is the first insulation spacer block, the second insulation spacer block and the 3rd insulation spacer block, wherein, the first insulation spacer block is placed in the first insulating sleeve, combine closely therebetween, central authorities at the first insulation spacer block end face are provided with the screwed hole that can closely screw with high-pressure bolt, the second insulation spacer block is the annulus post shapes, it is arranged between the second insulating sleeve and the 3rd insulating sleeve, the 3rd insulation spacer block is the step cylinder, 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 joins with an end of the first conducting strip, and the other end of the first conducting strip stretches out that the second insulating sleeve is close to and the outer wall and the high-pressure bolt that pass the second insulating sleeve and the first insulating sleeve joins;
The second electrode slice is placed in the top of the 3rd insulating sleeve and joins with an end of the 3rd conducting strip, the other end of the 3rd conducting strip stretches out that the 3rd insulating sleeve is close to and the outer wall and the short circuit turriform spring that pass the 3rd insulating sleeve and the 4th insulating sleeve joins, bottom electrode on top electrode on the first electrode slice and the second electrode slice passes respectively the first conducting strip of joining with it and the centre bore on the 3rd conducting strip, forms gap in the endoporus of the second insulation spacer block annulus post;
Inductance in described impedance branch road is placed in the second insulating sleeve, its lower end and the first electrode slice join and join by the first conducting strip and high-pressure bolt, its upper end joins by upper conduction spring, the second conducting strip, described the first nonlinear resistance, lower conduction spring, the second electrode slice and the 3rd conducting strip and short circuit turriform spring, wherein, the part of the second conducting strip passes the second insulating sleeve and along the outer wall setting of the second insulating sleeve and the 3rd insulating sleeve.
Described the first conducting strip consists of with the rectangular tie that is 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 rides on the second insulation spacer block and is connected with the first electrode slice.
Described the 3rd conducting strip consists of with the rectangular knob sheet be connected therebetween a great circle ring plate, a roundlet disc, the roundlet disc is placed in the bottom of the 3rd insulation spacer block and joins with described short circuit turriform spring, and the great circle ring plate is placed in the bottom of the second insulation spacer block and is connected with the second electrode slice.
The part that described the first conducting strip, the second conducting strip and the 3rd conducting strip arrange along the first insulating sleeve, the second insulating sleeve, the 3rd insulating sleeve or the 4th insulating sleeve outer wall each other formed central angle at 45-270 degree.
Described the first nonlinear resistance, the second nonlinear resistance and the 3rd nonlinear resistance are the metal oxide varistors sheet, and the specification of described metal oxide varistors sheet is Φ 33 * 33.
Described conducting strip is made by the red copper material, and described top electrode and bottom electrode are made by the brass band punching press, and it is shaped as truncated cone-shaped, and the thickness of brass band is at 0.3-1.0mm.
Compared with prior art, the utility model adopts frequency-selecting gap discharge circuit, the second nonlinear resistance and the 3rd nonlinear resistance to be in series between composite sheath inner high voltage bolt and earth stud structure, make the utility model under normal operation, between high-pressure bolt and earth stud, present high resistance, make that the leakage current of this circuit is less even to go to zero, also make thus large leap ahead in its useful life; When the utility model is subject to thunder and lightning (being high-frequency current) impact, because the inductive current in the impedance branch road of frequency-selecting gap discharge circuit can not suddenly change, the poor characteristic that leading its electric current 90 degree are arranged of its both end voltage, just at the gap branch road, produce high voltage and make gap discharge, the impedance branch road is by short circuit, and lightning current just imports the earth by gap branch road, the second nonlinear resistance, the 3rd nonlinear resistance and earth stud like this.And now, resistance while being less than the first nonlinear resistance, the second nonlinear resistance and the 3rd nonlinear resistance serial connection due to the second nonlinear resistance and the 3rd nonlinear resistance serial connection resistance, therefore, impose on the second nonlinear resistance relative low with the residual voltage at the 3rd nonlinear resistance serial connection branch road two ends.This structure makes the reduction of the utility model residual voltage ratio, through-current capability strengthen, and under any lightning impulse, its residual voltage value all, lower than the insulation level of protected equipment, has namely improved the level of protection to power equipment greatly.
The inwall that the sealed bottom lid that boosting inner chamber of the present utility model, concave ring groove place are thinner, insulating cylinder middle part thicken and insulating cylinder bottom be the structure of thin inwall gradually; make the utility model at strong lightning impulse, residual voltage value during near the insulation level of protected equipment; flashover will occur or in the situation that unexpected thermal runaway in non-linear resistor in it; earth stud quick and composite sheath automatically breaks away from; be that zinc oxide arrester hightails electric power system, thereby avoid occurring comminuted blast or cause permanent earth fault and have a power failure.
The accompanying drawing explanation
Fig. 1 is that schematic diagram cuts open in the utility model office.
Fig. 2 is core body schematic diagram of the present utility model.
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 utility model the first conducting strip schematic diagram.
Fig. 8 is the utility model the second conducting strip schematic diagram.
Fig. 9 is the utility model the 3rd conducting strip schematic diagram.
Figure 10 is equivalent circuit theory figure in the utility model composite sheath.
Figure 11 is the utility model bottom insulation seal cover profile schematic diagram.
Figure 12 be in Figure 11 E-E to cutaway view.
Figure 13 is the enlarged diagram of F section in Figure 12.
Figure 14 is the stereogram of the utility model conduction boosting disc.
Figure 15 is that in the boosting inner chamber, two conduction boosting disc pack add schematic diagram is set.
Figure 16 is two sheet resistor sheets schematic diagrames in parallel.
Figure 17 is three sheet resistor sheets schematic diagrames in parallel.
Figure 18 is the conductive connecting piece schematic diagram.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
Reference numeral is as follows:
As shown in Figure 1, the utility model is for the overvoltage protector of 6kV or 10kV AC electric power systems, comprise the composite sheath 1 formed by full skirt cover 11 and barrel-shaped insulating cylinder 12, full skirt cover 11 is made by the strong silicon rubber of hydrophobicity, on full skirt cover 11 outer walls, evenly be provided with the radially full skirt 111 of the improved external flashover voltage of evagination from top to bottom, insulating cylinder 12 coaxially arranges with full skirt cover 11, close proximity therebetween, described insulating cylinder 12 is high by intensity, the PBT material that good insulating and water absorption are low is made (PBT, English full name polybutylene terephthalate, Chinese name: polybutylene terephthalate, belong to polyester series, has thermal endurance, weatherability, resistance to chemical reagents, electrical characteristic is good, water absorption is little, the characteristics such as gloss is good).
In composite sheath 1, be provided with the high-pressure bolt 2 that joins with outside line, core body 4, short circuit turriform spring 5, the second nonlinear resistance R2, the two conduction boosting discs 81 boosting inner chamber 8, the 3rd nonlinear resistance R3, the bottom insulation seal cover 6 that form of stack and pass the earth stud 7 that bottom insulation seal cover 6 stretches out in opposite directions from top to bottom, in the top of composite sheath 1 and bottom, also be respectively equipped with the upper cover 13 and the lower cover 14 that are tightly connected with composite sheath 1 by stainless steel material, made, 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 have clamp nut 15, the outer termination high-voltage line of high-pressure bolt 2, its inner to pass upper cover 13 to be rotatably connected on composite sheath 1 inner top insulated enclosure lid 3; Being shaped as of earth stud 7 is "T"-shaped, its outer end is "T"-shaped vertical part, this end passes bottom insulation seal cover 6 and lower cover 14 is connected in the low-voltage ground end, its the inner is "T"-shaped transverse part, transverse part is shaped as the stainless steel disk of Φ 32 * 2, it is placed in composite sheath 1 and joins with the bottom face of the 3rd nonlinear resistance R3, and described clamp nut 15 is rotatably connected on the outer surface of described upper cover 13 or lower cover 14.
The insulating sleeve 41, top insulated enclosure lid 3 and the bottom insulation seal cover 6 that are contained in core body 4 are made by the PBT material, form seal cavity between insulating cylinder 12 inwalls of itself and composite sheath 1.
Described the second nonlinear resistance R2 and the 3rd nonlinear resistance R3 all can form (resistor disc parallel connection structure such as Figure 16 by multi-disc resistor disc serial or parallel connection or connection in series-parallel, 17, shown in 18, it is by metal oxide varistors sheet 9, insulating trip 91, conductive connecting piece 92 or metal oxide varistors sheet 9 and conductive connecting piece 92 form), the second nonlinear resistance R2 and the 3rd nonlinear resistance R3 are metal oxide varistors sheet 9, its format diameter is 28mm-42mm, thickness is 25mm-33mm, be preferably Φ 33 * 33, it can be zinc oxide nonlinear resistance slice, it can be also the carborundum resistor disc, it can also be piezoresistive wafer.
As shown in Figure 1, described boosting inner chamber 8 is located between the second nonlinear resistance R2 and the 3rd nonlinear resistance R3, also can be located between the 3rd nonlinear resistance R3 and bottom insulation seal cover (now, the second nonlinear resistance R2 can adopt connected mode in parallel with the 3rd nonlinear resistance R3, syndeton is shown in Figure 16), also can be simultaneously above-mentioned two local settings.In each boosting inner chamber 8, be equipped with two conduction boosting discs 81 that are superimposed in opposite directions, this conduction boosting disc 81 is by the second nonlinear resistance R2, the 3rd nonlinear resistance R3 and earth stud 7 couple together, conduction boosting disc is the disk of being made by latten(-tin), three corner positions that are positioned at equilateral triangle thereon cut out three legs perpendicular to this disk (as shown in figure 14), in boosting inner chamber 8, the stack of conduction boosting disc 81 is set to: the front end of the leg of a upper conduction boosting disc 81 touches the card of next conduction boosting disc 81, the front end of the leg of next conduction boosting disc 81 touches the card (as shown in figure 15) of a conduction boosting disc 81.
The effect of boosting inner chamber 8 is: during lightning impulse, if the first nonlinear resistance R1 and the second nonlinear resistance R2 flashover occurs or thermal runaway occurs, around in the interior generation high temperature and high pressure gas of the insulating cylinder 12 of composite sheath 1 Lower Half and cylinder, pressure upper and lower and that boosting inner chamber 8 is upper and lower is identical, and the gases at high pressure moment gathering in boosting inner chamber 8 produced by the first nonlinear resistance R1, the second nonlinear resistance R2 is boosted and by conducting electricity 81 pairs of the 3rd nonlinear resistance R3 application of forces of boosting disc the 3rd nonlinear resistance R3 and earth stud 7 are released downwards.
As Figure 11, shown in 12 and 13, the periphery of described bottom insulation seal cover 6 is the drum 63 extended vertically, its center is provided with tapped central tube 64, described earth stud 7 is placed through in this central tube 64, in order to improve the bonding strength of this central tube 64 and bottom insulation seal cover 6 bottom surfaces, can between the bottom surface inwall of bottom insulation seal cover 6, make the entity structure that is shaped as taper by central tube 64 tube walls, inwall at described drum 63 is provided with a barrel wall screw thread 61, on the periphery wall of the bottom of described insulating cylinder 12 (by the 3rd nonlinear resistance R3 bottom face corresponding insulating cylinder 12 inner wall positions to the part between insulating cylinder 12 bottom faces), be provided with and with described bucket wall screw thread 61, can screw and the cylinder end screw thread 121 of close fit, this structure is conducive to bottom insulation seal cover 6 when thermal runaway occurring, quick disengaging is connected with insulating cylinder 12.
As shown in Figure 1, in order to improve the intensity of insulating cylinder 12, while avoiding thermal runaway, blast, can be on described insulating cylinder 12 barrels, barrel thickness from described core body 4 bottom correspondence positions to part between described the 3rd nonlinear resistance R3 bottom correspondence position than described core body 4 bottom correspondence positions more than the barrel thickness of part large, on insulating cylinder 12 barrels, from the 3rd nonlinear resistance R3 bottom correspondence position to the barrel thickness between its bottom face, reduce gradually, simultaneously, described bottom insulation seal cover 6 is 1/20-1/6 of insulating cylinder 12 wall thickness with the thickness of the bottom insulation seal cover 6 of the insulating cylinder 12 bottom face sections of joining 65, be preferably 1/10.Do thinlyyer the bottom insulation seal cover 6 of the described section of joining 65 (as shown in figure 13), more be conducive to earth stud 7 and when thermal runaway, break away from fast and being connected of insulating cylinder 12.
In order to ensure when the thermal runaway, earth stud 7 breaks away from fast, the utility model do not blasted or cause permanent earth fault, on the outer face of the bottom insulation seal cover 6 bottom insulation seal cover 6 corresponding with the insulating cylinder 12 bottom face sections of joining 65, being provided with cross sectional shape and being the concave ring groove 62(of del as shown in figure 13).
Described short circuit turriform spring 5 is located between core body 4 bottom faces and the second nonlinear resistance R2 upper surface, and its Main Function makes core body 4 be electrically connected to the second nonlinear resistance R2 and works the degree of balance effect of regulating with its interface member.
Described core body 4 comprises insulating sleeve 41, insulation spacer block 42, electrode slice 43, the first nonlinear resistance R1, inductance L, conduction spring 44 and conducting strip 45, equivalent electric circuit (as shown in figure 10) in composite sheath 1 between high-pressure bolt 2 and earth stud 7 is by frequency-selecting gap discharge circuit and the second nonlinear resistance R2, conduction boosting disc 81 and the 3rd nonlinear resistance R3 are in series, described frequency-selecting gap discharge circuit is by gap branch road and inductance L, the impedance branch circuit parallel connection that the first nonlinear resistance R1 is composed in series forms, one end and the high-pressure bolt 2 of this equivalence circuit join, its other end and earth stud 7 join.
As Fig. 2, shown in 3, described core body 4 comprises insulating sleeve 41, insulation spacer block 42, electrode slice 43, the first nonlinear resistance R1, inductance L, conduction spring 44 and conducting strip 45, these parts adopt the formed equivalent electric circuit of connected mode described later to be: in composite sheath 1, form a frequency-selecting gap discharge circuit (referring to accompanying drawing 10) between high-pressure bolt 2 and the second nonlinear resistance R2, one end and the high-pressure bolt 2 of this frequency-selecting gap discharge circuit join, its other end and short circuit turriform spring 5 join, this circuit is to consist of two branch circuit parallel connections, article one, branch road is connected in series for discharging gap G and the conducting strip 45 formed by two electrode slices 43 the gap branch road formed, another branch road is by inductance L, the first nonlinear resistance R1, the impedance branch road that conducting strip 45 and conduction spring 44 serial connections form.
As shown in Fig. 2,3,4,5 and 6, described insulating sleeve 41 is made by the PBT material, it,, for barrel-shaped the first insulating sleeve 411, the second insulating sleeve 412, the 3rd insulating sleeve 413 and the 4th insulating sleeve 414 of being shaped as of coaxial setting from top to bottom, is equipped with the guiding groove 46 inwardly concaved on the outer wall of every joint insulating sleeve 41.
Described insulation spacer block 42 is also made by the PBT material, and it is the first insulation spacer block 421, the 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; Central authorities at the first insulation spacer block 421 end faces are provided with the screwed hole 31 that can closely screw with high-pressure bolt 2, the second insulation spacer block 422 is the 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 second insulating sleeve 412 and the 3rd insulating sleeve 413; The 3rd insulation spacer block 423 is the step cylinder, 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) wherein the first electrode slice 431 is placed in the bottom in the second insulating sleeve 412, it is shaped as discoid, at its periphery, be provided with the contact ring 433 of evagination extension vertically, be provided with in the central the top electrode 434 for electric discharge extended with convex with contact ring 433, described contact ring 433 and the first conducting strip 451 join.As shown in Figure 7, the first conducting strip 451 is to consist of a great circle girdle 4511, a small circle gridle 4512 and the rectangular tie 4513 that is connected between two ring belts, great circle girdle 4511 bottom surfaces ride on the second insulation spacer block 422, its end face and described contact ring 433 join, and the small circle gridle 4512 of the first conducting strip 451 stretches out that mode that the second insulating sleeve 412 is placed in described guiding groove 46 with its rectangular tie 4513 is close to and the outer wall that passes the second insulating sleeve 412 and the first insulating sleeve 411 is nested with and is connected on high-pressure bolt 2;
2) wherein the second electrode slice 432 shapes are identical with the first electrode slice 431, it is placed in tops in the 3rd insulating sleeve 413 and rides on lower conduction spring 442 and with the 3rd conducting strip 453 and join, and top electrode 434, contact ring 433 on the bottom electrode 435 on it, contact ring 433 and the first electrode slice 431 are oppositely arranged.As shown in Figure 9, the 3rd conducting strip 453 is to consist of with the rectangular knob sheet 4533 be connected therebetween a great circle ring plate 4531, a 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, contact ring 433 on its bottom surface and the second electrode slice 432 joins, and the roundlet disc 4532 of the 3rd conducting strip 453 stretches out that mode that the 3rd insulating sleeve 413 is placed in described guiding groove 46 with its rectangular knob sheet 4533 is close to and the outer wall and the described short circuit turriform spring 5 that pass the 3rd insulating sleeve 413 and the 4th insulating sleeve 414 joins;
3) top electrode 434 on the first electrode slice 431 and the bottom electrode 435 on the second electrode slice 432 pass respectively the first conducting strip 451 of joining with it and the centre bore 454 on the 3rd conducting strip 453, form discharging gap G in the endoporus 4221 of the second insulation spacer block 422 annulus posts.
Described top electrode 434 and bottom electrode 435 are stamped to form by brass band, and it is shaped as 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 road is as follows:
1) inductance L in the impedance branch road is placed in the second insulating sleeve 412, its lower end and the first electrode slice 431 join and join with high-pressure bolt 2 by the first conducting strip 451, its upper end is by upper conduction spring 441, the second conducting strip 452, described the first nonlinear resistance R1, lower conduction spring 442, the second electrode slice 432 and the 3rd conducting strip 453 join with short circuit turriform spring 5, wherein, as shown in Figure 8, being shaped as by two identical circular discs 4521 and connecting band therebetween 4522 of the second conducting strip 452 forms, two circular discs 4521 are joined 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 setting of the second insulation spacer block 422 and the second insulating sleeve 412.
2) in order to reach better insulation effect, described the first conducting strip 451, the second conducting strip 452 and the 3rd conducting strip 453 are along the first insulating sleeve 411, the second insulating sleeve 412, the rectangular tie 4513 that the 3rd insulating sleeve 413 or the 4th insulating sleeve 414 outer walls arrange, rectangular knob sheet 4533 and connecting band 4522 formed central angle are each other spent 45-270, 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 first nonlinear resistance R1 is identical with the 3rd nonlinear resistance R3 specification with the second nonlinear resistance R2, is all metal oxide varistors sheet 9, or is multi-disc metal oxide varistors sheet 9 resistor disc group in series.
Described the first conducting strip 451, the 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 the turriform spring, except playing electric action, also play the degree of balance effect of regulating with its interface member.
Each part dimension size and electric parameter in the utility model structure are adjustable; change according to demand the connection in series-parallel of inductance size, gap length and resistor disc; design the overvoltage protector of different protective ratios and residual voltage ratio, through-current capability size and life of product length; it can be regulated the corresponding size of associated components, electric parameter, thereby meets user's demand.
Described high level of protection, meet strong thunder automatic trip from electric power system, prevents that the structure function of pulverizing blast is described below:
As shown in Figure 1, the first half wall thickness of insulating cylinder 12 of the present utility model is 4mm, and the Lower Half wall thickness is 6mm, and its equivalent electric circuit as shown in figure 10.According to " GB11032-2010 " standard-required, nominal voltage is the power station of 10kV lightning arrester used, and usually, level of protection requires to be less than or equal to 45kV, and direct current 1mA reference voltage is more than or equal to 24kV.
Under the utility model nominal current 5kA, the residual voltage of average every metal oxide varistors sheet is 15kV, and the 1mA reference voltage is 8.8kV.The level of protection of (lightning arrester that 10kV is used in power station) zinc oxide arrester is 45kV routinely, and the 1mA reference voltage is in the situation of 26.4kV, and its residual voltage ratio is 1.7.Level of protection of the present utility model is 30kV, and the 1mA reference voltage is for being still 26.4kV, and residual voltage ratio but reduces to 1.13, and this is large the raising its level of protection and useful life just.
According to the research test result, diameter is 33mm, thickness is that its dielectric surface flashover voltage of insulator of 33mm is about the 30kV(peak value), so, when conventional lightning arrester is met strong thunder, its two ends pressure reduction will the apparatus insulated level of far super 75kV(), result: damage equipment, lightning arrester overcoat flashover or interior sudden strain of a muscle cause Explosion of on Arrester, also can not cause the electric power system permanent earth fault because of interior sudden strain of a muscle even do not explode.
The utility model is under any lightning current impacts, and its extreme value is 60kV, still is less than the insulation level of equipment 75kV, guarantees that equipment is well not impaired.
During as hundreds of kilo-ampere lightning current, the afterflow of hundreds of ampere may be arranged by the second nonlinear resistance R2 and the 3rd nonlinear resistance R3, thus in insulating cylinder 12 Lower Halves around produce high temperature and high pressure gas in reaching up and down boosting inner chamber 8, due to, the utility model arranges on described bottom insulation seal cover 6 bucket wall screw thread 61, the structure of concave ring groove 62, make bottom insulation seal cover 6 can tolerate the rotation cross force large, and the tolerance axial compressive force is little, due in insulating cylinder 12 Lower Halves up and down around suffered pressure P be the same, effect due to the special construction on bottom insulation seal cover 6 (being the thin end of the described section of joining 65 and the concave ring groove 62 of del) and boosting inner chamber 8, make the pressure imposed on bottom insulation seal cover 6 and "T"-shaped earth stud 7 be greater than doubly described pressure P of n, thereby, bottom insulation seal cover 6 and earth stud 7 are gone out downwards, be grounded thus the automatic detachment function of bolt 7.
The assembling of the utility model overvoltage protector:
One, the assembling of core body 4
1) make the location and installation support;
2) the 3rd insulation spacer block 423 is placed in the 4th insulating sleeve 414, coats Instant cement in its junction;
3) at bottom and the top of the 3rd insulation spacer block 423, coat Instant cement, roundlet disc 4532 on the 3rd conducting strip 453 is pasted on to the bottom of the 3rd insulation spacer block 423, a circular discs 4521 on the second conducting strip 452 is pasted on to the top of the 3rd insulation spacer block 423, then the first nonlinear resistance R1 is placed on the second conducting strip 452;
4) the 3rd insulating sleeve 413 is placed on the 4th insulating sleeve 414, its joining place is bonding, lower conduction spring 442 is placed in to the first nonlinear resistance R1 upper, then the mode that the second electrode slice 432 makes progress with bottom electrode 435 is placed on lower conduction spring 442;
5) be placed in the second insulation spacer block 422 on the 3rd insulating sleeve 413 and descend two surfaces to coat Instant cement thereon, again the great circle ring plate 4531 on the 3rd conducting strip 453 is pasted on to the lower surface of the second insulation spacer block 422, the great circle girdle of the first conducting strip 451 4511 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, bonding therebetween, then by the first electrode slice more than 431, mode that bottom electrode 435 is relative is placed on the great circle girdle 4511 of the first conducting strip 451, then inductance L is positioned on the first electrode slice 431;
7) on inductance L, placing conduction spring 441, another circular discs 4521 on the upper end of upper conduction spring 441 and the second conducting strip 452 is joined;
8) the first insulating sleeve 411 is placed on the second insulating sleeve 412, its joining place is bonding, Instant cement is coated in side and top and bottom at the first insulation spacer block 421, be pressed into again in the first insulating sleeve 411, the above another circular discs 4521 of its lower surface and the second conducting strip 452 is mutually bonding, 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, whole assembling
The core body 4 that 1) will assemble, its outer wall coat epoxy resin with the first insulating sleeve 411 in upper mode is packed composite sheath 1 into, put in the lump 70 the degree drying in oven;
2) short circuit turriform spring 5, the second nonlinear resistance R2, conduction boosting disc 81 and the 3rd nonlinear resistance R3 are put into by the bottom of composite sheath 1 and put into composite sheath 1 by position shown in Figure 1;
3) more "T"-shaped earth stud 7 is coated to the one-component room curing silicon rubber by screw-in bottom insulation seal cover 6 shown in Figure 1;
The bucket wall screw thread 61 that installs the sealed bottom lid 6 of "T"-shaped earth stud 7 is coated to the one-component room curing silicon rubber, then with the cylinder end screw thread 121 of insulating cylinder 12, screw sealing, described lower cover 14 is nested with on earth stud 7 by shown in Figure 1, screws nut and get final product.；
4) described upper cover 13 is close to the roundlet disc 4532 of the first conducting strip 451, again the lower end of high-pressure bolt 2 is passed in the screwed hole 31 on upper cover 13, roundlet disc 4532 screw-in the first insulation spacer block 421 end faces, screwed the nut be nested with on high-pressure bolt 2 and get final product.
Operation principle of the present utility model
While 1) normally moving:
The utility model is between composite sheath 1 inner high voltage bolt 2 and the second nonlinear resistance R2, to adopt the structure of frequency-selecting gap discharge circuit, as previously mentioned, between high-pressure bolt 2 and earth stud 7, present high resistance state, namely therebetween resistance value is by the first nonlinear resistance R1, the second nonlinear resistance R2 and the 3rd nonlinear resistance R3 resistance sum in series, thus, make that the leakage current electric current that flows through this frequency-selecting gap discharge circuit is less even to go to zero, due to the first nonlinear resistance R1 that flows through, the second nonlinear resistance R2 and the 3rd nonlinear resistance R3 electric current are very faint, thereby also increase its useful life thereupon.
2) during lightning impulse:
Frequency-selecting gap discharge circuit is to consist of gap branch road and impedance branch circuit parallel connection, its impedance branch road is again in series by inductance L and the first nonlinear resistance R1, when the moment of impacting the lightning current arriving, because having electric current, the inductance L in the impedance branch road can not suddenly change, the characteristic of its both end voltage leading current 90 degree, thereby the voltage instantaneous that puts on two ends, branch road intermediate gap, gap raises, force discharging gap G disruptive discharge, now, lightning current is by short circuit turriform spring 5, the second nonlinear resistance R2, the 3rd nonlinear resistance R3 and "T"-shaped earth stud 7 import the earth.
3) during extremely strong lightning impulse
As previously mentioned, level of protection of the present utility model is to be determined by the characteristic of the second nonlinear resistance R2 and the 3rd nonlinear resistance R3, the limiting value of level of protection is exactly puncture voltage or the second nonlinear resistance R2 and the 3rd nonlinear resistance R3 dielectric surface flashover voltage of the second nonlinear resistance R2 and the 3rd nonlinear resistance R3, in this case, when thermal runaway occurring, the utility model arranges on described bottom insulation seal cover 6 bucket wall screw thread 61, the structure of concave ring groove 62, make bottom insulation seal cover 6 can tolerate the rotation cross force large, and the tolerance axial compressive force is little, due in insulating cylinder 12 Lower Halves up and down around suffered pressure P be the same, due to the effect of bottom insulation seal cover 6 due to the special construction on bottom insulation seal cover 6 (being the thin end of the described section of joining 65 and the concave ring groove 62 of del) and boosting inner chamber 8, make the pressure imposed on bottom insulation seal cover 6 and "T"-shaped earth stud 7 be greater than doubly described pressure P of n, thereby, bottom insulation seal cover 6 and earth stud 7 are gone out downwards, be grounded thus the automatic detachment function of bolt 7.
Claims (10)
1. overvoltage protector for 6kV or 10kV AC electric power systems, comprise by full skirt cover (11), the composite sheath (1) that coaxially arranges with full skirt cover (11) and form with the insulating cylinder (12) of its inwall close proximity, at composite sheath (1) inner high voltage bolt (2), core body (4), the second nonlinear resistance (R2), bottom insulation seal cover (6) with pass the earth stud (7) that bottom insulation seal cover (6) stretches out and be connected successively, it is characterized in that: between the second nonlinear resistance (R2) and bottom insulation seal cover (6), also be provided with the 3rd nonlinear resistance (R3), and be provided with boosting inner chamber (8) between the second nonlinear resistance (R2) and the 3rd nonlinear resistance (R3) and/or between the 3rd nonlinear resistance (R3) and bottom insulation seal cover (6), in each boosting inner chamber (8), be provided with and make the second nonlinear resistance (R2), the conduction boosting disc (81) that the 3rd nonlinear resistance (R3) and earth stud (7) are electrically connected to, the periphery of described bottom insulation seal cover (6) is the drum (63) extended vertically, inwall at this drum (63) is provided with a barrel wall screw thread (61), on the bottom periphery wall of insulating cylinder (12), be provided with described bucket wall screw thread (61) and can screw the also cylinder end screw thread (121) of close fit, described bottom insulation seal cover (6) is 1/20-1/6 of insulating cylinder (12) wall thickness with the thickness of the bottom insulation seal cover (6) of described insulating cylinder (12) the bottom face section of joining (65), described core body (4) comprises insulating sleeve (41), insulation spacer block (42), electrode slice (43), the first nonlinear resistance (R1), inductance (L), conduction spring (44) and conducting strip (45), equivalent electric circuit in composite sheath (1) between high-pressure bolt (2) and earth stud (7) is by frequency-selecting gap discharge circuit and the second nonlinear resistance (R2), conduction boosting disc (81) and the 3rd nonlinear resistance (R3) are in series, described frequency-selecting gap discharge circuit is by gap branch road and inductance (L), the impedance branch circuit parallel connection that the first nonlinear resistance (R1) is composed in series forms, one end of this equivalence circuit and high-pressure bolt (2) join, its other end and earth stud (7) join.
2. the overvoltage protector for 6kV or 10kV AC electric power systems according to claim 1; it is characterized in that: on described insulating cylinder (12) barrel; above barrel thickness partly is large than described core body (4) bottom correspondence position for barrel thickness from described core body (4) bottom correspondence position to part between described the 3rd nonlinear resistance (R3) bottom correspondence position; on insulating cylinder (12) barrel, reduce gradually from the 3rd nonlinear resistance (R3) bottom correspondence position to the barrel thickness between its bottom face.
3. the overvoltage protector for 6kV or 10kV AC electric power systems according to claim 2 is characterized in that: be provided with the concave ring groove that cross sectional shape is del (62) on bottom insulation seal cover (6) and insulating cylinder (12) bottom face join the outer face of bottom insulation seal cover (6) corresponding to part.
4. the overvoltage protector for 6kV or 10kV AC electric power systems according to claim 1 is characterized in that: also be provided with and make the short circuit be electrically connected to turriform spring (5) therebetween between described core body (4) bottom face and the second nonlinear resistance upper surface (R2).
5. the overvoltage protector for 6kV or 10kV AC electric power systems according to claim 4, it is characterized in that: first insulating sleeve (411) of described insulating sleeve (41) for from top to bottom coaxially arranging, the second insulating sleeve (412), the 3rd insulating sleeve (413) and the 4th insulating sleeve (414), described insulation spacer block (42) is the first insulation spacer block (421), the second insulation spacer block (422) and the 3rd insulation spacer block (423), wherein, the first insulation spacer block (421) is placed in the first insulating sleeve (411), combine closely therebetween, central authorities at the first insulation spacer block (421) end face are provided with the screwed hole (31) that can closely screw with high-pressure bolt (2), the second insulation spacer block (422) is the annulus post shapes, it is arranged between the second insulating sleeve (412) and the 3rd insulating sleeve (413), the 3rd insulation spacer block (423) is the step cylinder, 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 joins with an end of the first conducting strip (451), and the other end of the first conducting strip (451) stretches out that the second insulating sleeve (412) is close to and the outer wall and the high-pressure bolt (2) that pass the second insulating sleeve (412) and the first insulating sleeve (411) joins;
The second electrode slice (432) is placed in the top of the 3rd insulating sleeve (413) and joins with an end of the 3rd conducting strip (453), the other end of the 3rd conducting strip (453) stretches out that the 3rd insulating sleeve (413) is close to and the outer wall and the short circuit turriform spring (5) that pass the 3rd insulating sleeve (413) and the 4th insulating sleeve (414) joins, top electrode (434) on the first electrode slice (431) and the bottom electrode (435) on the second electrode slice (432) pass respectively the first conducting strip (451) of joining with it and the centre bore (454) on the 3rd conducting strip (453), in the endoporus (4221) of the second insulation spacer block (422) annulus post, form gap (G),
Inductance (L) in described impedance branch road is placed in the second insulating sleeve (412), its lower end and the first electrode slice (431) join and pass through the first conducting strip (451) and join with high-pressure bolt (2), its upper end is by upper conduction spring (441), the second conducting strip (452), described the first nonlinear resistance (R1), lower conduction spring (442), the second electrode slice (432) and the 3rd conducting strip (453) join with short circuit turriform spring (5), wherein, the part of the second conducting strip (452) passes the second insulating sleeve (412) and along the outer wall setting of the second insulating sleeve (412) and the 3rd insulating sleeve (413).
6. the overvoltage protector for 6kV or 10kV AC electric power systems according to claim 5; it is characterized in that: described the first conducting strip (451) consists of a great circle girdle (4511), a small circle gridle (4512) and the rectangular tie (4513) that is connected two ring belts; small circle gridle (4512) is nested with and is connected to high-pressure bolt (2) above, and great circle girdle (4511) rides in the second insulation spacer block (422) above and is connected with the first electrode slice (431).
7. the overvoltage protector for 6kV or 10kV AC electric power systems according to claim 5; it is characterized in that: described the 3rd conducting strip (453) is by a great circle ring plate (4531), a roundlet disc (4532) and be connected rectangular knob sheet (4533) formation therebetween; roundlet disc (4532) is placed in the bottom of the 3rd insulation spacer block (423) and joins with described short circuit turriform spring (5), 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).
8. the overvoltage protector for 6kV or 10kV AC electric power systems according to claim 5 is characterized in that: the part that described the first conducting strip (451), the second conducting strip (452) and the 3rd conducting strip (453) arrange along the first insulating sleeve (411), the second insulating sleeve (412), the 3rd insulating sleeve (413) or the 4th insulating sleeve (414) outer wall each other formed central angle at 45-270 degree.
9. according to the described overvoltage protector for 6kV or 10kV AC electric power systems of any one in claim 1-8; it is characterized in that: described the first nonlinear resistance (R1), the second nonlinear resistance (R2) and the 3rd nonlinear resistance (R3) are metal oxide varistors sheet (9), and the specification of described metal oxide varistors sheet (9) is Φ 33 * 33.
10. according to the described overvoltage protector for 6kV or 10kV AC electric power systems of any one in claim 5-7; it is characterized in that: described conducting strip (45) is made by the red copper material; described top electrode (434) and bottom electrode (435) are made by the brass band punching press; it is shaped as truncated cone-shaped, and the thickness of brass band is at 0.3-1.0mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320111674XU CN203311955U (en) | 2013-03-12 | 2013-03-12 | Overvoltage protector for 6kV or 10kV of alternating-current power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320111674XU CN203311955U (en) | 2013-03-12 | 2013-03-12 | Overvoltage protector for 6kV or 10kV of alternating-current power system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203311955U true CN203311955U (en) | 2013-11-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320111674XU Expired - Lifetime CN203311955U (en) | 2013-03-12 | 2013-03-12 | Overvoltage protector for 6kV or 10kV of alternating-current power system |
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| Country | Link |
|---|---|
| CN (1) | CN203311955U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151125A (en) * | 2013-03-12 | 2013-06-12 | 郑越 | Over-voltage protector used for 6kV or 10kV alternating-current power system |
| CN109215908A (en) * | 2017-06-30 | 2019-01-15 | 河南平高通用电气有限公司 | A kind of arrester and its core and core upper press cover |
| CN110265800A (en) * | 2019-05-21 | 2019-09-20 | 中国建筑第八工程局有限公司 | Based on the earthing or grounding means and its construction method under the conditions of plate brad supporting |
| CN114823015A (en) * | 2022-06-29 | 2022-07-29 | 山东泰开互感器有限公司 | Overvoltage protector, manufacturing method and capacitor voltage transformer |
-
2013
- 2013-03-12 CN CN201320111674XU patent/CN203311955U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151125A (en) * | 2013-03-12 | 2013-06-12 | 郑越 | Over-voltage protector used for 6kV or 10kV alternating-current power system |
| CN103151125B (en) * | 2013-03-12 | 2015-11-18 | 郑越 | For the overvoltage protector of 6kV or 10kV AC electric power systems |
| CN109215908A (en) * | 2017-06-30 | 2019-01-15 | 河南平高通用电气有限公司 | A kind of arrester and its core and core upper press cover |
| CN109215908B (en) * | 2017-06-30 | 2021-08-20 | 河南平高通用电气有限公司 | Lightning arrester and core and upper gland of core thereof |
| CN110265800A (en) * | 2019-05-21 | 2019-09-20 | 中国建筑第八工程局有限公司 | Based on the earthing or grounding means and its construction method under the conditions of plate brad supporting |
| CN114823015A (en) * | 2022-06-29 | 2022-07-29 | 山东泰开互感器有限公司 | Overvoltage protector, manufacturing method and capacitor voltage transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131127 Effective date of abandoning: 20151118 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |