CN100576675C - The protective device of energy storage capacitor group - Google Patents
The protective device of energy storage capacitor group Download PDFInfo
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- CN100576675C CN100576675C CN200710053741A CN200710053741A CN100576675C CN 100576675 C CN100576675 C CN 100576675C CN 200710053741 A CN200710053741 A CN 200710053741A CN 200710053741 A CN200710053741 A CN 200710053741A CN 100576675 C CN100576675 C CN 100576675C
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- inductance
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- lightning arrester
- capacitor
- fuse
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Abstract
The protective device of energy storage capacitor group belongs to the power-supply system protective device, and purpose is voltage limit with the inductance two ends in its voltage-limiting protection district, thereby avoids inductance to blast, and can guarantee that fuse can normal blow-out simultaneously again.The capacitor parallel running of N platform equivalence of the present invention, series connection fuse and equivalent inductance on each capacitor branch road, described inductance two ends lightning arrester connected in parallel, the direct current 1mA reference voltage of lightning arrester is not less than capacitor normal working voltage U
C, the lightning impulse current residual voltage is not more than the horizontal U of dielectric voltage withstand of inductance
L, the impact discharge capacity of lightning arrester is (0.7～1.5) * (1/2) LI
2When being short-circuited fault; fuse plays cutting-off of short-circuit electric current; inductance is used for the climbing of limiting short-circuit current; when the inductance both end voltage reaches set point; the lightning arrester action; with the voltage limit at inductance two ends in its voltage-limiting protection district, thereby avoid inductance to blast, can guarantee that fuse can normal blow-out simultaneously again.
Description
Technical field
The invention belongs to the power-supply system protective device, particularly a kind of protective device of energy storage capacitor group.
Background technology
The power-supply system of capacitor energy storage provides energy with hundreds of capacitor parallel connections, and be operated in the state of the big electric current of high-voltage pulse, capacitor shortens the life-span greatly because of aging and operate miss, cause the internal breakdown short circuit even blast, both make the loss of circuit element and busbar huge, jeopardized personal safety again.Similar fault all once took place on the NIF device of the U.S. and the laser-produced fusion supply unit of China.The energy storage density of capacitor and energy are big more, and the loss that is caused is just big more, so the protection of capacitor is extremely important.
Existing energy storage capacitor group protective device is seen Qin Shihong, Liu Kefu, Li Jing, Pan Yuan, " experimental study of impulse power electrical source capacitor protection ", High-Voltage Electrical Appliances, 2001,37 (4): 4～6.Be series connection fuse and inductance on each capacitor branch road, inductance is used for the climbing of limiting short-circuit current, reduces the impact of short circuit current to capacitor; Fuse is used to excise short trouble, moves before the peaking prerequisite at fault current, and the fuse experience melts, gasifies, becomes phase transition process such as arc-plasma, and last electric arc extinguishes in quartz sand.In this phase transition process, the resistance of fuse rises rapidly, make the voltage of fuse be higher than the voltage of capacitor, therefore electric current begins to descend, at last along with the arc extinction short circuit current reduces to zero, thus the disengagement failure branch road, capacitor released energy reduce as far as possible, at this moment, other branch road capacitors still have higher residual voltage, reduce like this or eliminate the destruction of short circuit current to element in the loop.In the process of fuse excision short trouble, the overtension at fuse two ends can cause at the inductance two ends and produce very high overvoltage, blasts thereby cause inductance turn-to-turn insulation to puncture; Cause fuse function to lose efficacy simultaneously, can't cut off circuit, fault is enlarged.
Summary of the invention
The invention provides a kind of protective device of energy storage capacitor group, purpose is voltage limit with the inductance two ends in its voltage-limiting protection district, thereby avoids inductance to blast, and can guarantee that fuse can normal blow-out simultaneously again.
The invention provides a kind of protective device of energy storage capacitor group; the capacitor parallel running of N platform equivalence; series connection fuse and equivalent inductance on each capacitor branch road; it is characterized in that: described inductance two ends lightning arrester connected in parallel, the direct current 1mA reference voltage of lightning arrester is not less than capacitor normal working voltage U
C, the lightning impulse current residual voltage is not more than the horizontal U of dielectric voltage withstand of inductance
L, the impact discharge capacity of lightning arrester is
L is described inductance value in the formula, and I is described fuse cut-off current, and N is a natural number.
The protective device of described energy storage capacitor group is characterized in that: described lightning arrester is a metal oxide arrester, and its 1mA reference voltage is U
C～U
L/ 1.6, the lightning impulse current residual voltage is 1.6U
C～U
L
Among the present invention; when being short-circuited fault, fuse plays cutting-off of short-circuit electric current, and inductance is used for the climbing of limiting short-circuit current; lightning arrester can limit the overvoltage at inductance two ends; because lightning arrester has good non-linear voltage-current characteristic, select suitable parameters, when the inductance both end voltage reaches set point; the lightning arrester action; with the voltage limit at inductance two ends in its voltage-limiting protection district, thereby avoid inductance to blast, can guarantee that fuse can normal blow-out simultaneously again.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention;
Among the figure, capacitor 1, fuse 2, inductance 3, lightning arrester 4, load 5, switch 6.
Embodiment
The present invention will be described below in conjunction with accompanying drawing.
In Fig. 1, capacitor 1 series connection fuse 2 and inductance 3 on every capacitor branch road, inductance 3 two ends lightning arrester connected in parallel 4.Each capacitor branch road parallel connection is connected to load 5 by switch 6.
Embodiment: 34 capacitor parallel runnings, every capacitor is 110uF, operating voltage 23.5kV, resistance value sum 112m Ω, the inductance value sum of fuse and inductance is 73uH on each bar branch road.The dielectric voltage withstand level of inductance is designed to 2.5 times of capacitor normal working voltages, i.e. 58.75kV.Press above-mentioned parameter design, the direct current 1mA voltage of lightning arrester is taken as 23.5～36.7kV, and the lightning impulse current residual voltage is 37.6～58.75kV, and concrete numerical value is got by the pressure ratio that the ZnO valve plate of manufacturer production can reach in above-mentioned scope.Because the ratio of lightning impulse current residual voltage and direct current 1mA voltage is generally 1.6～2.0 at present, therefore, if the direct current 1mA voltage of lightning arrester is taken as 23.5kV, desirable (1.6～2) * 23.5=37.6～47kV of lightning impulse residual voltage then, if the lightning impulse residual voltage of lightning arrester is taken as 58.75kV, then direct current 1mA voltage is (58.75/2～58.75/1.6) kV, i.e. 29.4～36.7kV, when the cut-off current value of fuse is designed to 30kA
The impact discharge capacity of lightning arrester is 23kJ～49.3kJ.
Claims (2)
1. the protective device of an energy storage capacitor group; the capacitor parallel running of N platform equivalence; series connection fuse and equivalent inductance on each capacitor branch road, it is characterized in that: described inductance two ends lightning arrester connected in parallel, the direct current 1mA reference voltage of lightning arrester is not less than capacitor normal working voltage U
C, the lightning impulse current residual voltage of lightning arrester is not more than the horizontal U of dielectric voltage withstand of inductance
L, the impact discharge capacity of lightning arrester is
L is described inductance value in the formula, and I is described fuse cut-off current, and N is a natural number.
2. the protective device of energy storage capacitor group as claimed in claim 1 is characterized in that: described lightning arrester is a metal oxide arrester, and its direct current 1mA reference voltage is U
C～U
L/ 1.6, the lightning impulse current residual voltage of described metal oxide arrester is 1.6U
C～U
L
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710053741A CN100576675C (en) | 2007-11-02 | 2007-11-02 | The protective device of energy storage capacitor group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710053741A CN100576675C (en) | 2007-11-02 | 2007-11-02 | The protective device of energy storage capacitor group |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101150253A CN101150253A (en) | 2008-03-26 |
| CN100576675C true CN100576675C (en) | 2009-12-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710053741A Expired - Fee Related CN100576675C (en) | 2007-11-02 | 2007-11-02 | The protective device of energy storage capacitor group |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100576675C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064543B (en) * | 2010-12-30 | 2014-08-06 | 芜湖国睿兆伏电子股份有限公司 | Fault protection device of high-energy power supply system and protection method thereof |
-
2007
- 2007-11-02 CN CN200710053741A patent/CN100576675C/en not_active Expired - Fee Related
Non-Patent Citations (4)
| Title |
|---|
| 并联电容器组的过电压保护. 陈建聪.电力电容器，第2001卷第2期. 2001 |
| 并联电容器组的过电压保护. 陈建聪.电力电容器，第2001卷第2期. 2001 * |
| 脉冲电容器组电容器保护的对策分析. 秦实宏，刘克富，李劲，潘垣.高电压技术，第27卷第1期. 2001 |
| 脉冲电容器组电容器保护的对策分析. 秦实宏，刘克富，李劲，潘垣.高电压技术，第27卷第1期. 2001 * |
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| Publication number | Publication date |
|---|---|
| CN101150253A (en) | 2008-03-26 |
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| C10 | Entry into substantive examination | ||
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Granted publication date: 20091230 Termination date: 20111102 |