CN1667775A - Volume-regulating type arc-extinction device - Google Patents
Volume-regulating type arc-extinction device Download PDFInfo
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- CN1667775A CN1667775A CN 200510012367 CN200510012367A CN1667775A CN 1667775 A CN1667775 A CN 1667775A CN 200510012367 CN200510012367 CN 200510012367 CN 200510012367 A CN200510012367 A CN 200510012367A CN 1667775 A CN1667775 A CN 1667775A
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Abstract
This invention relates to a capacitance-tuning arc-extinguishing device composed of an arc-extinguishing coil with secondary winding and a capacitor set, among which, multiple sets of capacitors and switches are set in the capacitor set, each capacitor is serial to a switch to be parallel on the side edge of the arc-extinguishing device. After the improvement, the queuing structure positions of the capacitors and switches are opposite in the adjacent capacitors, a switch is connected between the adjacent serial points of said capacitor and the switch, which increases the usability of capacitors by combined usage of series and parallel.
Description
Technical field
The present invention relates to a kind of by the band arc suppression coil of secondary winding and the compensation arrangement of the elimination ground arc that multiple unit capacitor is formed, genus electric protection device technical field.
Background technology
During 6～35KV medium voltage distribution network generation single phase ground fault, if faulty line is not cut, because the effect of line-to-ground coupling capacitance, the fault current based on capacity current will be flow through in the fault point.The fault current that flows through when the fault point will cause intermittent electric arc during greater than 10A and in the certain numerical value scope, the safety of harm electric equipment, thus and may cause heterogeneous fault and cause fault trip.In order to suppress the generation of this electric arc, people are at the neutral point of medium voltage distribution network or on the artificial neutral point that grounding transformer is drawn arc suppression coil is installed.Arc suppression coil in the single phase ground fault loop, provide one with the electrical network suitable inductance current of coupling capacitance electric current over the ground, and neutralize with capacitance current, the aftercurrent that makes the fault point is less than the required minimum current of the starting the arc, thereby the intermittent electric arc of fault can't be produced.Because the intermittent electric arc of arc suppression coil can eliminate the medium voltage distribution network single phase ground fault time, thus the safety of protection electric equipment and ensure the reliability of medium voltage distribution network continued power, so it has obtained application more and more widely in medium voltage distribution network.
The arc suppression coil that uses has multiple pattern at present, it is multiple to be divided into automatic turn-adjusting, D.C. magnetic biasing formula, controllable silicon adjustable type, adjusting gapped-core type etc., realized on-line monitoring and followed the tracks of compensation that by them its compensation precision and response speed have all obtained raising to a certain degree.Chinese patent discloses a kind of volume-regulating type arc-extinction device No. 00228292.5, it is on the basis of the artificial turn-adjusting arc suppression coil of tradition, removes the tap on the winding, increases a secondary winding simultaneously, by changing the capacitor group number that inserts wherein, reach the purpose of regulating offset current step by step.The gear of this volume-regulating type arc-extinction device is more, and response speed is fast, line fault electric current in the time of can compensating single phase ground fault fast.But find in actual applications, because electrical network actual capacitance current value and gear value can not be mated just, this can bring error, especially this error will be more serious when big when gear is differential, thereby the fault current compensation when making the medium voltage distribution network single phase ground fault is incomplete, can cause electric arc to extinguish when serious.If the single-line to ground fault that the person gets an electric shock and causes then can occur making the electric current that flows through electric shock person excessive because of error makes that the gear input compensation is incomplete, increased the possibility of electric shock person's death.Therefore, this volume-regulating type arc-extinction device being improved is the new problem that the technical staff faces.
Summary of the invention
Technical problem to be solved by this invention provides a kind of volume-regulating type arc-extinction device that can reduce effectively can not mate the error that produces because of gear current value and electric network capacitance and current value, thereby improves the volume-regulating type arc-extinction device of compensation precision.
The technical scheme that addresses the above problem is:
A kind of volume-regulating type arc-extinction device, it is made up of the arc suppression coil and the capacitor group of band secondary winding, be provided with multiple unit capacitor and switch in the capacitor group, each capacitor and a switch are in series, be attempted by on the arc suppression coil secondary after both series connection, its improvements are that the arrangement architecture position opposite of capacitor in the neighboring capacitors group and switch connects a switch between the adjacent string contact of described capacitor and switch.
Above-mentioned volume-regulating type arc-extinction device, the group number of described capacitor group is 4～10 groups.
Above-mentioned volume-regulating type arc-extinction device, the ratio of the appearance value of each capacitor is in the described capacitor group: C
1: C
2: C
3: C
4: C
5: C
n=1: 2: 4: 8: 16 ...: 2
N-1
Above-mentioned volume-regulating type arc-extinction device, described switch adopts any switch of mechanical, automatically controlled class or analog switch class.
The arc-extinction device that adopts the present invention to provide, the series and parallel by the capacitor group is used in combination, and has improved the utilance of capacitor group, can increase regulation stall greatly under the situation that does not increase capacitor group number, it is differential to reduce the gear adjusting, improves tuning precision, and its method is simple, is easy to realize.When the electric shock of the generation person causes single phase ground fault, also reduced not exclusively to cause the possibility of getting an electric shock and dying because of current compensation.
Description of drawings
Fig. 1 is an electrical schematic diagram of the present invention.
Each label is among the figure; 1. neutral point (neutral point that the neutral point of medium voltage distribution network or grounding transformer are drawn), the 2. arc suppression coil of band secondary winding, 3. capacitor group, C
1, C
2, C
3, C
4... C
nBe capacitor, K
1, K
2, K
3, K
4K
n, K
12, K
23, K
34Be switch, Ca, Cb, Cc are each phase line-to-ground coupling capacitance of electrical network.
Embodiment
As we can see from the figure, the present invention is made up of the arc suppression coil 2 and the capacitor group 3 of band secondary winding, be provided with multiple unit capacitor and switch in the capacitor group, each capacitor be attempted by on the secondary L2 of arc suppression coil 2 after a switch is connected, primary coil L1 one is terminated at power network neutral point, other end ground connection.The number of capacitor can be established a plurality of arbitrarily, but adopts 4～10 can satisfy the adjusting requirement in the practice.
Any two adjacent group capacitors, the link position of capacitor and switch is opposite, promptly a group capacitor is descending at last, switch, another then adjacent with it group capacitor, its ordering be capacitor down and switch last, in other words, the arrangement mode of capacitor is identical at interval in the whole capacitor device group 3.Network topology structure analysis by control loop reasonably is provided with opening-closing capacitor bank, increases by one group of switch (as K between adjacent two opening-closing capacitor bank in parallel
12, K
23Or K
34Deng), be used to connect the capacitor of adjacent legs.For reducing the usage quantity of switch, the connection design of capacitor group and fling-cut switch in parallel thereof should be carried out according to Fig. 1, drops into one group of series capacitors like this and only uses one group of switch just much of that.Cooperate with capacitor after the capacitor of original parallel connection or other are connected again after the capacitors in series, a lot of new gears just can appear, these new gears are distributed between the gear of the pure capacitor group generation that is connected in parallel, can be with its gear refinement more than 2/3, when the capacitor group increases, the also corresponding increase of the gear number of refinement.
The embodiment that Fig. 1 draws has used 5 group capacitors, and the label 1 among the figure connects the neutral point of medium voltage distribution network or the neutral point that grounding transformer is drawn; Arc suppression coil 2 is mainly used to provide inductance current; The ratio of the appearance value of each capacitor is 6 o'clock to be at N in the capacitance group: C
1: C
2: C
3: C
4: C
5: C
6=1: 2: 4: 8: 16: 32, when increasing capacitor, it was by 2
nRule change.
For example on the 10KV distribution system rated voltage being installed is 10.5KV, and capacity is 1212KVA, and the current compensation scope is the arc suppression coil of 80～200A.If the arc suppression coil that uses is a documents Central Plains volume-regulating type arc-extinction device, when capacitor group number was 4 groups, 5 groups, 6 groups, the gear number that it has was respectively 16,32 and 64; And use the controlled volume-regulating type arc-extinction device of connection in series-parallel of the present invention, and so Dui Ying gear number is respectively 28,64 and 142, and its number of can transferring the files is wanted many a lot of levels.
Providing these two kinds of arc suppression coils below is 6 o'clock at capacitor group number, the offset current numerical value that each grade can provide:
One. the volume-regulating type arc-extinction device that documents provided, based on 6 group capacitors, can provide 64 gears, each grade offset current numerical value is respectively:
80.0A，81.9A，83.8A，85.7A，87.6A，89.5A，91.4A，93.3A，95.2A，97.1A，99.0A，100.9A，102.9A，104.8A，106.7A，108.6A，110.5A，112.4A，114.3A，116.2A，118.1A，120.0A，121.9A，123.8A，125.7A，127.6A，129.5A，131.4A，133.3A，135.2A，137.1A，139.0A，140.9A，142.8A，144.7A，146.7A，148.6A，150.5A，152.4A，154.3A，156.2A，158.1A，160.0A，161.9A，163.8A，165.7A，167.6A，169.5A，171.4A，173.3A，175.2A，177.1A，179.0A，181.0A，182.9A，184.8A，186.7A，188.6A，190.5A，192.4A，194.3A，196.2A，198.1A，200.0A。
The controlled volume-regulating type arc-extinction device of two connection in series-parallel provided by the present invention, it can provide 142 gears also based on 6 group capacitors, and each grade offset current numerical value is respectively:
80A，81.9A，83.8A，84.4A，85.7A，87.6A，88.9A，89.5A，90.8A，91.4A，92.0A，93.3A，95.2A，97.1A，97.7A，99.0A，99.6A，100.9A，101.5A，102.2A，102.9A，103.5A，104.2A，104.8A，106.1A，106.7A，107.3A，108.6A，110.5A，112.4A，114.3A，114.9A，115.6A，116.2A，117.5A，118.1A，119.4A，120.0A，121.3A，121.9A，122.5A，123.2A，123.8A，124.4A，125.1A，125.7A，126.3A，127.0A，127.6A，128.2A，128.9A，129.5A，130.1A，131.4A，132.0A，132.7A，133.3A，133.9A，134.6A，135.2A，136.5A，137.1A，137.7A，139.0A，140.9A，142.8A，144.7A，145.4A，146.7A，148.6A，149.9A，150.5A，151.1A，151.8A，152.4A，153.0A，154.3A，154.9A，155.6A，156.2A，156.8A，158.1A，158.7A，160.0A，160.6A，161.9A，162.5A，163.2A，163.8A，164.4A，165.1A，165.7A，166.3A，167.0A，167.6A，168.2A，168.9A，169.5A，170.1A，170.8A，171.4A，172.0A，172.7A，173.3A，173.9A，174.6A，175.2A，175.8A，176.5A，177.1A，177.7A，178.4A，179.0A，179.6A，180.3A，181.0A，182.3A，182.9A，183.5A，184.2A，184.8A，185.4A，186.1A，186.7A，187.3A，188.0A，188.6A，189.2A，189.9A，190.5A，191.1A，192.4A，193.0A，193.7A，194.3A，194.9A，195.6A，196.2A，197.5A，198.1A，198.7A，200.0A。
More above-mentioned two groups of data as can be seen, the present invention has increased the gear number of offset current greatly, makes each gear obtain refinement, differentially is reduced to 0.63A from 1.9A, has improved compensation precision.
Switch among the present invention can adopt any switch of mechanical, automatically controlled class or analog switch class, and to back two kinds of switches, its break-make is controlled by control device.
Claims (4)
1. volume-regulating type arc-extinction device, it is made up of the arc suppression coil [2] and the capacitor group [3] of band secondary winding, the capacitor group has multiple unit capacitor and switch in [3], each capacitor group is in series by a group capacitor and a switch, be attempted by on the secondary L2 of arc suppression coil [2] after both series connection, it is characterized in that: the arrangement architecture position opposite of capacitor in the neighboring capacitors group and switch connects a switch between the adjacent string contact of described capacitor and switch.
2. volume-regulating type arc-extinction device according to claim 1 is characterized in that: the group number of described capacitor group is 4～10 groups.
3. volume-regulating type arc-extinction device according to claim 1 and 2 is characterized in that: the ratio of the appearance value of each capacitor is in the described capacitor group [3]: C
1: C
2: C
3: C
4: C
5: C
n=1: 2: 4: 8: 16 ...: 2
N-1
4. volume-regulating type arc-extinction device according to claim 3 is characterized in that: described switch adopts any switch of mechanical, automatically controlled class or analog switch class.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100123676A CN100459007C (en) | 2005-03-03 | 2005-03-03 | Volume-regulating type arc-extinction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100123676A CN100459007C (en) | 2005-03-03 | 2005-03-03 | Volume-regulating type arc-extinction device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1667775A true CN1667775A (en) | 2005-09-14 |
| CN100459007C CN100459007C (en) | 2009-02-04 |
Family
ID=35038783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100123676A Expired - Fee Related CN100459007C (en) | 2005-03-03 | 2005-03-03 | Volume-regulating type arc-extinction device |
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| CN (1) | CN100459007C (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2424559Y (en) * | 2000-03-18 | 2001-03-21 | 重庆大学 | Device for fast regulating arc-extinguishing coil |
| CN2438257Y (en) * | 2000-05-24 | 2001-07-04 | 顺德特种变压器厂 | Automatic tuning arc suppression oil earthing device |
| CN2773884Y (en) * | 2005-03-03 | 2006-04-19 | 华北电力大学 | Series and parallel controllable and capacitor-adjustable arc extinguisher |
-
2005
- 2005-03-03 CN CNB2005100123676A patent/CN100459007C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN100459007C (en) | 2009-02-04 |
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Granted publication date: 20090204 Termination date: 20130303 |