CN2238500Y - Over-voltage protector made of over-voltage protective element - Google Patents
Over-voltage protector made of over-voltage protective element Download PDFInfo
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- CN2238500Y CN2238500Y CN 95203325 CN95203325U CN2238500Y CN 2238500 Y CN2238500 Y CN 2238500Y CN 95203325 CN95203325 CN 95203325 CN 95203325 U CN95203325 U CN 95203325U CN 2238500 Y CN2238500 Y CN 2238500Y
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Abstract
The utility model discloses an over-voltage protection device which is used for the silicon variable current equipment and which is mainly composed of an electric power semiconductor over-voltage protection element. The utility model comprises three element structures and three thyristor over-voltage protection devices which are used for the three-phase bridge type thyristor variable current equipment, wherein, three over-voltage protection device can simultaneously suppress the incoming line and outgoing line of the thyristor variable current device, and the three over-voltage protection devices can invade the operation over-voltage of the variable current device. The three over-voltage protection devices can absorb surge energy, and the three over-voltage protection devices can absorb the phase conversion over-voltage and the higher harmonic voltage of the thyristor. The utility model is suitable for the over-voltage protection and the absorption of the surge energy for various electric power semiconductor devices in various silicon variable current equipment. The utility model can replace the conventional over-voltage protection elements and devices of the existing capacitance-resistance absorption protection, selenium stack protection and the common pressure level resistance protection, etc.
Description
The utility model is applied to the silicon convertor equipment to be suppressed switching overvoltage and absorbs big surge energy, can protect thyristor, silicon stack, rectifier diode, high power transistor (GTR), gated transistor various electric semiconductors such as (IGBT) reliably.Avoid the over-voltage breakdown accident of electric semiconductor.
The silicon convertor equipment can produce various inevitable switching overvoltages when operation, zero load is operated a switch as rectifier transformer, inductive load cut-offs, overload trip and commutation spike etc., these switching overvoltages are overvoltage multiple height (5～10 times) not only, but also being accompanied by the release of a large amount of surge energies, the energy that is discharged as the rectifier transformer switching overvoltage of a 5000KA reaches as high as 14500 joules.Therefore the switching overvoltage to the silicon convertor equipment must be suppressed, and could guarantee electric semiconductor not by over-voltage breakdown, and the components and parts and the combinational circuit thereof that require to suppress switching overvoltage can absorb higher surge energy again by over-voltage.
At present, both at home and abroad the silicon convertor equipment all adopts resistance-capacitance protection, selenium pile protection, BOD (break-over diode still do not have in translation) circuit protection and the protection of common zinc oxide piezo-resistance to suppress switching overvoltage.Wherein resistance-capacitance protection is the most frequently used a kind of, though its protection effect is better, volume is big, the cost height, and wiring is also complicated; Though the selenium pile protection can absorb bigger surge energy, its non linear coefficient not high (being generally 3～7), so pressure limiting is indifferent, and need not also " bin aging " can take place for a long time; BOD protection is the highest a kind of of state-of-the art, but cost is more taller than the capacitance-resistance protection.
The 1970's, China brought into use common zinc oxide () piezo-resistance (mainly containing MY31 and MYS type) that electric semiconductor is carried out overvoltage protection; its volume is little; price is low; simple and convenient and the non linear coefficient of wiring is up to 15～35; pressure limiting is very competent; therefore once generally adopted; what but common varistor adopted is high-pressure type zinc oxide pressure-sensitive valve block (hereinafter to be referred as the high pressure valve block); energy absorption capability is very poor; by present maximum specification (nominal voltage 2300V; through-current capacity 20KA) conversion, its energy capacity only has 2000 joules, under the high-energy Operating Over Voltage Surge; often damage; even blast, burn adjacent components and parts, make the accident expanded rangeization.Over nearly 20 years, the actual result that uses shows: the spoilage in 1 year of common piezo-resistance operation is more than 20%, and the spoilage that causes pernicious power outage is 3～5%, and as seen its reliability extreme difference is also very dangerous.
In sum, existing various protection schemes all exist economy and technical between contradiction, seriously hamper the development of silicon Semiconductor Converting Technology.
The purpose of this utility model be propose a kind of overvoltage protection that constitutes by overvoltage protection element with solve the existing economy of existing overvoltage protection scheme and technical between contradiction.Its main conception is that high energy low field intensity the zinc oxide () varistor valve (hereinafter to be referred as the high energy valve block) that adopts international the mid-80 to succeed in developing is main function components and special structural design, make the utility model can absorb the above big surge energy of 2 kJ (kilojoule)s again by over-voltage, and volume is little, energy consumption is low, wiring is simple, ratio of performance to price height is easy to promote the use of.
The purpose of this utility model is achieved in that
A kind of overvoltage protection that is made of overvoltage protection element is characterized in that: comprise that the zinc oxide varistor with the high energy low field intensity is the electric semiconductor overvoltage protection that master unit constitutes.
---described overvoltage protection element RF
1～RF
6Be connected into three-phase bridge circuit, and A, B, three terminals of C are connected to the AC inlet wire side of thyristor current transformer (2) respectively, D, E terminal are connected to the output of current transformer (2) respectively, six groups of RC circuit (R
1C
1～R
6C
6) be parallel to each over-voltage protection element RF respectively
1～RF
6Last absorption thyristor commutation overvoltage and higher harmonic voltage.
---the same polarity output of described rectification circuit (22) and (33) is parallel to a, b 2 points, and overvoltage protection element RF is connected to a, b two ends, resistor R
1, R
2Constitute a capacitance-resistance filter loop with electrochemical capacitor C and also be parallel to a, b two ends, A, B, three terminals of C are connected to the AC inlet wire side of current transformer (4) respectively, and D, E terminal are connected to the output of current transformer (4) respectively.
---the same polarity output of described rectification circuit (22) and (33) is parallel to a, b 2 points, BOD (break-over diode) pipe and resistance R
3Be parallel to a, b two ends after the series connection, voltage stabilizing didoe DW is parallel to resistor R
3, 2 of the same e of cathode terminal C, the d of high speed thyristor KK link together R by lead
1, R
2Constitute a capacitance-resistance filter loop and be parallel to a, b two ends with capacitor C, A, B, three terminals of C are connected to the AC inlet wire side of current transformer (4) respectively, and D, E terminal are connected to the output of current transformer (4) respectively.
---described overvoltage protection element adopts high energy low field intensity zinc oxide varistor valve; conductive path all adopts copper and aluminium; add soft good conductor medium between the valve block and between valve block and each aluminum electrode plate; the connection in series-parallel of valve block can realize by battery lead plate and lead in the inside of same shell; valve block more than two groups same can be contained under situation in parallel in the shell as an individual component, the space between shell and the inner body is all filled up with quartz sand.
---the brass conductive wiring screw rod (1) in the described overvoltage protection element and the center inner bolt hole of aluminium end cap (4) are by threaded connection; by clamp nut (2) on tightening brass conductive wiring screw rod (1) being rotated compresses inner valve block (10) part; brass conductive wiring screw rod (1) and the cone match of aluminum electrode plate (7) by compensating mutually, the taper hole of aluminum electrode plate (7) is positioned at the plane geometry center of this plate.
---described overvoltage protection element adopts dead ring (8) and bolt (10); nut (11); with aluminum electrode plate (9); valve block (12) fastens as one; adopt the cone match of compensation mutually between aluminum electrode plate (9) and the brass conductive wiring screw rod (1) and pass through nut (5); plain washer (6) and spring washer (7) fasten as one; be with anti-creepage insulating sleeve (18) on the fastening bolt (10), the center inner bolt hole of the same aluminium end cap of upper end brass wiring screw rod (1) (4) passes through threaded engagement.
---two brass conductive wiring screw rod (1) of imbedding in the fastening rod (18) of described overvoltage protection element; and have a diameter on the top of inlet part greater than this termination, screw rod garden; prevent that screw rod (1) pulls when fastening, and will guarantee that two screw rods are concentric up and down.Valve block (9), aluminum electrode plate (8), (11), division board (10) all have central through hole, and the through-hole diameter of part is identical or bigger with the center-hole diameter of valve block (9) beyond the valve block, and the diameter of fastening rod is slightly less than above-mentioned part central through hole diameter.
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is the performance diagram of high energy valve block.
Fig. 2 is the common piezo-resistance structure chart of MYS type.
Fig. 3 is the utility model over-voltage protection element embodiment 1 structure chart.
Fig. 4 is the utility model over-voltage protection element embodiment 2 structure charts.
Fig. 5 is the utility model over-voltage protection element embodiment 3 structure charts.
Fig. 6 is the utility model over-pressure safety device embodiment 1 structure chart.
Fig. 7 is the utility model over-pressure safety device embodiment 2 structure charts.
Fig. 8 is the utility model over-pressure safety device embodiment 3 structure charts.
Concrete implementing measure of the present utility model is:
One. select the high energy valve block (characteristic of this valve block is seen Fig. 1) that is fit to the protection electric semiconductor for use.The high energy valve block only limited the use of in generator amature demagnetization and the auxiliary arc extinguishing of circuit breaker in the past, therefore its residual voltage ratio (was referred to the voltage U under the 100A
100AWith nominal voltage U
10mARatio, U
100A/ U
10mA, see Fig. 1) and less demanding, be generally 1.6～1.7, and electric semiconductor, only be 2.5～3.5 usually as the voltage reserve factor of thyristor, residual voltage ratio must be selected like this and be 1.35～1.55 high-quality high energy valve block and reliable protection could be realized.
Two. the connection in series-parallel of high energy valve block all can be joined sheet: this overvoltage protection element is (the seeing Fig. 3, Fig. 4, Fig. 5) that is combined by the high energy valve block connection in series-parallel more than 2; because the electric of each valve block can all exist dispersiveness by number inevitably; dispersiveness is crossed conference and is caused each sheet energy load unbalanced; cause OL valve block aging in advance, lost efficacy (short circuit) also finally causes all valve blocks to lose efficacy.Therefore the high energy valve block must guarantee that when series connection the relative deviation rate of the slope K of near linear (as shown in phantom in Figure 1) of the volt-ampere characteristic of each sheet between the big Current Zone of 10A～100A and intercept d is respectively less than soil 0.1% and ± 2%; The relative deviation rate of the slope k of each valve block branch road and intercept d can both reach more than 90% with the series-parallel equal energy rate that guarantees the high energy valve block respectively less than ± 0.01% and ± 1% when in parallel.
Three. structural design: be used in the past silicon convertor equipment switching overvoltage protection the common piezo-resistance of MYS type structure as shown in Figure 2; because high pressure valve block (4) volume little (being about φ (30～35) * (1～4) mm) that it uses; in light weightly (be about 5～10g); therefore compressing spring (2) with steel compresses the series connection of high pressure valve block; from mechanical design angle is feasible, but this structural design has following many unreasonable parts:
1. steel compression spring (2) is a non-conductor, as the part of conductive path, does not meet the low-voltage electrical apparatus designing requirement.And the heavy current impact of repeated multiple times can make compression spring annealing follow the string, and makes to use the back loose contact for a long time between spring and valve block, valve block and the valve block, even opens a way, and loses protective effect.
2. be air dielectric between high pressure valve block (4) and the bakelite shell (3), be unfavorable for valve block heat radiation can making air dielectric that thermal expansion can take place when valve block is overheated, cause bakelite shell (3) blast of breaking by the heat transmission.
3. this structure can only realize the series connection of valve block, and parallel connection is impossible in same shell if desired.
4. the height of bakelite shell (3) is fixed, and is unadjustable, may cause insufficient height when the valve block number is too much, caused the waste of material when the valve block number is very few again, and therefore the generalization degree of this shell is not high.
Because the volume and weight of the high energy valve block that the utility model adopted is 5～17 times of the high pressure valve block under equal voltage; thickness is about its 3～15 times; and need connection in series-parallel to combine; so can not adopt original structural design, this overvoltage protection element adopts following three kinds of new-type construction design methods such as Fig. 3, Fig. 4, shown in Figure 5.
Design one:
As shown in Figure 3, this structure is characterised in that:
Brass conductive wiring screw rod (1) and up and down the centre bore of aluminium end cap (4) by being threaded.
2. an end of brass conductive wiring screw rod (1) (up and down each) adopts the conical surface compression fit of compensation mutually with aluminum electrode plate (7) up and down, increases contact area, reduces contact resistance.
3. by tightening upper end clamp nut (2), the brass conductive wiring screw rod rotates, and conehead heads into the center taper hole of aluminum electrode plate (7) and all high energy valve block parts such as (10) of inside are compressed, and the torsion of nut (2) should be controlled at 10 native 2 Newton meters.
4. inner valve block is by aluminum electrode plate (11) (totally two), bakelite or epoxy resins insulation dividing plate (12), plastic insulation copper core (sectional area 4～6mm
2) lead (9) and (13) and wiring copper, aluminium screw (8) (totally 4) realize inner in parallel.
5. the enclosure air gap is all filled up with 40 order left and right sides quartz sands, to absorb the valve block heat, to get rid of inner air, prevents the blast that air expansion causes.
6. as cancellation part (9), (11), (12), (1 3) all valve blocks (10) (more than 2) being pressed on then is single cascaded structure together, and therefore this structure can realize the connection in series-parallel of valve block simultaneously in same shell.
7. all adopt good conductor on the conductive path: brass and aluminium.
8. for reducing between the valve block and the contact resistance between valve block and each battery lead plate, adding soft good conductor medium between each valve block and between valve block and the battery lead plate, as aluminium foil, copper mesh, aluminium wire netting etc.
9. adopt custom-designed by a plurality of built-in type bakelites or epoxy resin sheath (5) (inner surface is shaped on the internal thread that matches with aluminium end cap (4)), how much look the valve block consumption, with waterproof strong adhesive (as epoxy resin), the height-adjustable shell of bonding one-tenth is to realize the standardization and the generalization of housing designs.
Design two:
See Fig. 4, this structure not only has whole advantages of design one, and also has following new characteristics:
1. flat aluminum electrode plate (9) (up and down totally two), high energy valve block (12) (more than 2), part (13), (15) and up and down two bakelites or epoxy resins insulation ring (8) (totally 3 covers are plane 120 by screw rod (10), nut (11).Distribute) inner core that fastens as one, its objective is to make between valve block and the valve block, contact closely difficult becoming flexible between valve block and battery lead plate (9), (13).
2. adopt the cone match of compensation mutually also to fasten as one by nut (5), plain washer (6), spring washer (7) between aluminum electrode plate (9) and the brass conductive wiring screw rod (1), its purpose is with the 2nd of design one explanation.
3. adopt custom-designed by a plurality of built-in type bakelites or epoxy resin oversheath (can be made into the Any shape that meets assembling and packed and transported needs) (19), with fire prevention strong adhesive (as epoxy resin etc.) the height-adjustable shell of bonding one-tenth, the 9th of illustrating with design one of its purpose.
4. put insulating sleeve (18) on the fastening bolt (10), in case inner creepage.
5. part (13) (totally two) is an aluminum plane electrode plate, and part (15) is bakelite or epoxy resins insulation division board, and part (14) and (16) are plastic insulation copper core (sectional area 4～6mm
2Lead, part (17) (totally four) are wiring copper/aluminium screw, and its effect is with the 4th of design one.
6. be threaded (centre bore of following aluminium end cap (20) be through hole) of the centre bore of the same aluminium end cap of upper end brass conductive wiring screw rod (1) (4) by cooperatively interacting, after earlier lower end clamp nut (22) being tightened during assembling, fastening again upper end nut (2), can prevent that like this clamp nut (2) from drawing pine with inner valve block when torsion is excessive, causes loose contact.
7. design other characteristics of two the the the 5th, the 6th, the 7th, the 8th with design one.
Design three:
See Fig. 5, be characterized in:
High energy valve block (9) must the employing center punching valve block of band through hole.
2. aluminum electrode plate (8) (up and down totally two), valve block (9) and part (10), (11) (fastening rod (18) two ends is during fabrication imbedded two anti-brass conductive wiring screw rod (1) of drawing rounded head that have diameter greater than this screw rod to be slightly less than the bakelite of valve block center-hole diameter or the fastening rod of epoxy resin (18) by diameter, two screw rods will guarantee with one heart), brass clamp nut (5), copper flat washer (6), beryllium-bronze spring washer (7) (each cover up and down) fastens as one, compare parts such as having cancelled dead ring with design two, simple in structure, be difficult for the changing of the relative positions between the valve block, and the compaction forces between the valve block is not subjected to the up and down influence of the torque magnitude of clamp nut (2) and (19).
3. part (11) (totally two) is the middle aluminium plane electrode plate that through hole is arranged, part (10) is the middle bakelite that has a through hole or epoxy resin division board (center-hole diameter of the part of above band centre bore should be identical with the center-hole diameter of valve block or be slightly larger than valve block center-hole diameter), and part (12), (13) are plastic insulation copper core (sectional area 4～6mm
2) lead, part (14)) be wiring copper/aluminium screw, its effect is with the 4th of design one explanation.
4. design other characteristics of three with design one the the the 5th, the 6th, the 7th, the 8th and design the 3rd of two explanations.
Four. overvoltage protection of the present utility model
The utility model overvoltage protection element (no matter adopting aforementioned any structural design) can be used as discrete component and uses, its mode of connection is identical with common piezoresistive element in the ordinary course of things, be about to this element and exchange the connection of inlet wire side triangle, the cross-over connection of direct current outlet side at current changing device; To gated transistor (IGBT) and high power transistor (GTR) but between cross-over connection and its emitter and collector.But above-mentioned wiring using method must combine with the main loop design of silicon convertor equipment; be arranged in the convertor equipment (cabinet); so just be difficult to realize generalization; another purpose of the present utility model just provides the overvoltage protection that uses this overvoltage protection element and other components and parts to combine, and is applicable to various three-phase bridge thyristor variable flow devices.Following three kinds of its embodiment:
Device 1:
Shown in the interior circuit diagram of Fig. 6 dot-dash wire frame (1), RF
1～RF
6Be this overvoltage protection element, RD
1～RD
5Be fuse, R
1～R
6Be noninductive linear resistor, C
1～C
6Be noninductive ac capacitor, RF
1～RF
6Adopt the three-phase bridge connection, R
1And C
1, R
2And C
2, R
3And C
3, R
4And C
4, R
5And C
5, R
6And C
6Be composed in series small-sized rc filter circuit and be parallel to RF respectively
1～RF
6On each overvoltage protection element.Outlet terminal A, the B of this device, C are connected to the AC inlet wire side of thyristor current transformer (2), and D, E connect the output with (2) respectively.Its operation principle is: RF when converter system does not have switching overvoltage and occurs
1～RF
6Not conducting, leakage current is less than 250 μ A, and power consumption is not more than 0.4W, and resistance is greater than 200M Ω, when switching overvoltage occurs, is parallel in the current transformer (2) the overvoltage protection element RF on every (group) thyristor respectively
1～RF
6Conducting immediately in 50m μ s, resistance drops to 5～25 Ω, because its strong nonlinear characteristic (see figure 1), the inductive energy storage that overvoltage Limiting can be absorbed transformer T and load (3) in safe range and in pressure limiting disappears R until overvoltage
1～R
6And C
1～C
6The filter circuit of forming can absorb the high order harmonic component that produces in the commutation overvoltage of ripple weekly 6 times of thyristor and the filtering converter system, protection overvoltage protection element RF
1～RF
6The characteristics of device 1 are (group) thyristor of each overvoltage protection element protection, and thyristor always has two (groups) to be in conducting state when operate as normal, like this overvoltage protection element RF
1～RF
6Two while conductings in parallel are also always arranged, because shunting action in parallel can reduce conducting voltage, so the pressure limiting ability is better than the mode of connection of traditional common piezo-resistance; R
1～R
6And C
1～C
6Each filter circuit of forming absorbs commutation spike of every (group) thyristor and the high order harmonic component in the filtering appts respectively.Annotate: RD
1～RD
5Effect be at RF
1～RF
6Protection circuit when being short-circuited with rc filter circuit contingency.
Device 2:
Shown in circuit diagram (1) in Fig. 7 dot-dash wire frame; (22) do not control rectifier bridge for three-phase bridge; (33) do not control rectifier bridge (high-power integrated rectification module or the manufacturing of discrete power rectifier diode can be adopted in (22), (35)) for single-phase bridge; RF is an overvoltage protection element; RD is a fuse, R
1, R
2Be noninductive linear resistor, C is an electrolytic capacitor.The mode of connection of outlet terminal A, B, C, D, E is with device 1.Its operation principle is that not conducting of RF when no switching overvoltage takes place in the current transformer (4) is by R
1, R
2The small-sized resistance-capacitance circuit of forming with C absorbs the commutation spike of thyristor and the high order harmonic component in the filtering appts; in when, switching overvoltage taking place in the current transformer (4) regardless of the overvoltage direction; this overvoltage all is converted to a end by rectifier bridge 22 and 33 and is positive polarity; the b end is negative polarity; at this moment RF conducting pressure limiting and absorption inductor energy storage disappear until overvoltage; the characteristics of device 2 are only to suppress the switching overvoltage of current transformer alternating current-direct current bilateral with an overvoltage protection element, absorb the commutation spike and the filtering high order harmonic component of all thyristors with a cover resistance-capacitance circuit.Annotate: the effect of RD is at RF and resistance-capacitance circuit just in case protection circuit and rectifier bridge (22), (33) when being short-circuited.
Device 3:
See Fig. 8, it is the modified model of device 2, and it has increased a BOD pipe (break-over diode), high speed thyristor KK, voltage stabilizing didoe DW and common linear resistor R on the basis of device 2
3Certain operation principle is that (no longer repeating with device 2 something in common) is when switching overvoltage takes place; conducting voltage (this conducting voltage should be lower than the rated voltage of the thyristor) BOD that exceeds BOD as the peak value of this voltage manages at first triggering and conducting; electric current flows through R3 and produces a voltage drop; this voltage drop triggers high speed thyristor KK conducting; overvoltage is applied on the overvoltage protection element RF; RF conducting pressure limiting (conducting voltage of RF should be lower than the conducting voltage of BOD pipe); in case the RF conducting, the BOD pipe automatically shuts down.At RF with switching overvoltage restriction and absorbed surge energy; after overvoltage disappears; the RF blocking-up; KK is blocking-up thereupon also; the effect of voltage stabilizing didoe DW is the gate pole of protection high speed thyristor KK, and the effect of fuse RD is that protection circuit and rectifier (22), (33) are not burnt by overcurrent when RF, BOD pipe and KK contingency puncture short.The characteristics of device 3 are: overvoltage protection element RF is blocked by high speed thyristor KK under no over-voltage condition fully; leakage current passes through; can improve the useful life of RF; and the selection of the nominal voltage of RF and conducting voltage can give no thought to the operating voltage of current transformer major loop; even may be selected in below the major loop operating voltage; whether the conducting of RF depends on fully that BOD manages whether conducting; because the puncture voltage of BOD is more accurate; thereby reliable in action is good; and can reduce the voltage reserve factor of protected thyristor, reduce the overall cost of convertor equipment.
Because the master unit of the utility model overvoltage protection element and protective device has adopted high energy low field intensity the zinc oxide () varistor valve of high-quality; have that non linear coefficient height, energy absorption capability are strong, impulse response speed fast (≤50m μ s), volume is little, the ratio of performance to price is high characteristics, be thoroughly to replace the traditional capacitance-resistance overvoltage absorption plant and the renewal product of other existing all kinds of overvoltage protection absorption plants (circuit).Compare with the capacitance-resistance absorption plant, volume can descend 90%, and cost reduces about 86%, can become the desirable overvoltage protection element and the protective device of various electric semiconductors in the silicon convertor equipment.
Claims (8)
1. an overvoltage protection that is made of overvoltage protection element is characterized in that: comprise that the zinc oxide varistor with the high energy low field intensity is the electric semiconductor overvoltage protection that master unit constitutes.
2. a kind of overvoltage protection that is made of overvoltage protection element according to claim 1 is characterized in that: overvoltage protection element RF
1～RF
6Be connected into three-phase bridge circuit, and A, B, three terminals of C are connected to the AC inlet wire side of thyristor current transformer (2) respectively, D, E terminal are connected to the output of current transformer (2) respectively, six groups of RC circuit (R
1C
1～R
6C
6) be parallel to each over-voltage protection element RF respectively
1～RF
6Last absorption thyristor commutation overvoltage and higher harmonic voltage.
3. a kind of overvoltage protection that is made of overvoltage protection element according to claim 1 is characterized in that: the same polarity output of rectification circuit (22) and (33) is parallel to a, b 2 points, and overvoltage protection element RF is connected to a, b two ends, resistor R
1, R
2Constitute a capacitance-resistance filter loop with electrochemical capacitor C and also be parallel to a, b two ends, A, B, three terminals of C are connected to the AC inlet wire side of current transformer (4) respectively, and D, E terminal are connected to the output of current transformer (4) respectively.
4. a kind of over-pressure safety device that is made of overvoltage protection element according to claim 1 is characterized in that: the same polarity output of rectification circuit (22) and (33) is parallel to a, b 2 points, BOD (break-over diode) pipe and resistance R
3Be parallel to a, b two ends after the series connection, voltage stabilizing didoe DW is parallel to resistor R
3, 2 of the same e of cathode terminal C, the d of high speed thyristor KK link together R by lead
1, R
2Constitute a capacitance-resistance filter loop and be parallel to a, b two ends with capacitor C, A, B, three terminals of C are connected to the AC inlet wire side of current transformer (4) respectively, and D, E terminal are connected to the output of current transformer (4) respectively, and overvoltage protection element RF is connected to a, b two ends.
5. according to claim 1 or 2 or 3 or 4 described a kind of overvoltage protections that constitute by overvoltage protection element; it is characterized in that: overvoltage protection element adopts high energy low field intensity zinc oxide varistor valve; conductive path all adopts copper and aluminium; add soft good conductor medium between the valve block and between valve block and each aluminum electrode plate; the connection in series-parallel of valve block can realize by battery lead plate and lead in the inside of same shell; valve block more than two groups same can be contained under situation in parallel in the shell as an individual component, the space between shell and the inner body is all filled up with quartz sand.
6. a kind of overvoltage protection that constitutes by overvoltage protection element according to claim 5; it is characterized in that: the brass conductive wiring screw rod (1) in the overvoltage protection element and the center inner bolt hole of aluminium end cap (4) are by threaded connection; by clamp nut (2) on tightening brass conductive wiring screw rod (1) being rotated compresses inner valve block (10) part; brass conductive wiring screw rod (1) and the cone match of aluminum electrode plate (7) by compensating mutually, the taper hole of aluminum electrode plate (7) is positioned at the plane geometry center of this plate.
7. a kind of overvoltage protection that constitutes by overvoltage protection element according to claim 5; it is characterized in that: overvoltage protection element adopts dead ring (8) and bolt (10); nut (11); with aluminum electrode plate (9); valve block (12) fastens as one; adopt the cone match of compensation mutually between aluminum electrode plate (9) and the brass conductive wiring screw rod (1) and pass through nut (5); plain washer (6) and spring washer (7) fasten as one; be with anti-creepage insulating sleeve (18) on the fastening bolt (10), the center inner bolt hole of the same aluminium end cap of upper end brass wiring screw rod (1) (4) passes through threaded engagement.
8. a kind of overvoltage protection that constitutes by overvoltage protection element according to claim 5; it is characterized in that: two brass conductive wiring screw rod (1) of imbedding in the fastening rod (18) of overvoltage protection element; and have a diameter on the top of inlet part greater than this termination, screw rod garden; prevent that screw rod (1) pulls when fastening, and will guarantee that two screw rods are concentric up and down.Valve block (9), aluminum electrode plate (8), (11), division board (10) all have central through hole, and the through-hole diameter of part is identical or bigger with the center-hole diameter of valve block (9) beyond the valve block, and the diameter of fastening rod is slightly less than above-mentioned part central through hole diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95203325 CN2238500Y (en) | 1995-01-29 | 1995-01-29 | Over-voltage protector made of over-voltage protective element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95203325 CN2238500Y (en) | 1995-01-29 | 1995-01-29 | Over-voltage protector made of over-voltage protective element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2238500Y true CN2238500Y (en) | 1996-10-23 |
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ID=33856210
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95203325 Expired - Fee Related CN2238500Y (en) | 1995-01-29 | 1995-01-29 | Over-voltage protector made of over-voltage protective element |
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| CN (1) | CN2238500Y (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841150A (en) * | 2010-05-14 | 2010-09-22 | 中国北车股份有限公司大连电力牵引研发中心 | Thyristor protector |
| CN103236686A (en) * | 2013-04-11 | 2013-08-07 | 安徽徽电科技股份有限公司 | Dynamic energy balancing method for zinc-oxide valve blocks in shunt capacitor devices |
| CN104300522A (en) * | 2013-07-19 | 2015-01-21 | 天宝电子（惠州）有限公司 | Lightning protection device |
| CN104375016A (en) * | 2013-08-14 | 2015-02-25 | 国家电网公司 | Simulation device for large-capacity metallic oxide voltage limiters |
| CN105305354A (en) * | 2015-11-13 | 2016-02-03 | 国网湖南省电力公司 | Air quantity determining method of meeting cooling requirements of extra-high voltage direct-current thawing device |
| CN106847449A (en) * | 2017-02-20 | 2017-06-13 | 辰硕电子(九江)有限公司 | A kind of high pressure varistor of long-life high reliability |
| CN110649830A (en) * | 2018-06-26 | 2020-01-03 | 富士电机株式会社 | Motor overvoltage protection device, power conversion device, and drive device |
| WO2024032887A1 (en) * | 2022-08-10 | 2024-02-15 | Hitachi Energy Ltd | Hybrid voltage limiter comprising trigger electronic, thyristor component and a varistor |
-
1995
- 1995-01-29 CN CN 95203325 patent/CN2238500Y/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841150A (en) * | 2010-05-14 | 2010-09-22 | 中国北车股份有限公司大连电力牵引研发中心 | Thyristor protector |
| CN101841150B (en) * | 2010-05-14 | 2012-10-24 | 中国北车股份有限公司大连电力牵引研发中心 | Thyristor protector |
| CN103236686A (en) * | 2013-04-11 | 2013-08-07 | 安徽徽电科技股份有限公司 | Dynamic energy balancing method for zinc-oxide valve blocks in shunt capacitor devices |
| CN103236686B (en) * | 2013-04-11 | 2015-05-13 | 安徽徽电科技股份有限公司 | Dynamic energy balancing method for zinc-oxide valve blocks in series capacitor |
| CN104300522A (en) * | 2013-07-19 | 2015-01-21 | 天宝电子（惠州）有限公司 | Lightning protection device |
| CN104375016A (en) * | 2013-08-14 | 2015-02-25 | 国家电网公司 | Simulation device for large-capacity metallic oxide voltage limiters |
| CN104375016B (en) * | 2013-08-14 | 2018-01-19 | 国家电网公司 | A kind of analogue means of large capacity metal oxide pressure-limiting device |
| CN105305354A (en) * | 2015-11-13 | 2016-02-03 | 国网湖南省电力公司 | Air quantity determining method of meeting cooling requirements of extra-high voltage direct-current thawing device |
| CN106847449A (en) * | 2017-02-20 | 2017-06-13 | 辰硕电子(九江)有限公司 | A kind of high pressure varistor of long-life high reliability |
| CN110649830A (en) * | 2018-06-26 | 2020-01-03 | 富士电机株式会社 | Motor overvoltage protection device, power conversion device, and drive device |
| CN110649830B (en) * | 2018-06-26 | 2021-07-16 | 富士电机株式会社 | Motor overvoltage protection device, power conversion device, and drive device |
| WO2024032887A1 (en) * | 2022-08-10 | 2024-02-15 | Hitachi Energy Ltd | Hybrid voltage limiter comprising trigger electronic, thyristor component and a varistor |
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