CN106653357B - A kind of adjustable high-voltage capacitor Quasi-constant power electric discharge device of discharge power - Google Patents
A kind of adjustable high-voltage capacitor Quasi-constant power electric discharge device of discharge power Download PDFInfo
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- CN106653357B CN106653357B CN201710003765.4A CN201710003765A CN106653357B CN 106653357 B CN106653357 B CN 106653357B CN 201710003765 A CN201710003765 A CN 201710003765A CN 106653357 B CN106653357 B CN 106653357B
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- liquid resistance
- low pressure
- electric discharge
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- 239000003990 capacitor Substances 0.000 title claims abstract description 30
- 239000007788 liquid Substances 0.000 claims abstract description 42
- 238000007789 sealing Methods 0.000 claims abstract description 20
- 229920005479 Lucite® Polymers 0.000 claims abstract description 18
- 238000009413 insulation Methods 0.000 claims abstract description 18
- 229910052751 metal Inorganic materials 0.000 claims abstract description 18
- 239000002184 metal Substances 0.000 claims abstract description 18
- 239000004926 polymethyl methacrylate Substances 0.000 claims abstract description 18
- 238000003825 pressing Methods 0.000 claims abstract description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 239000008367 deionised water Substances 0.000 claims description 2
- 229910021641 deionized water Inorganic materials 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 3
- 239000010931 gold Substances 0.000 claims 3
- 229910052737 gold Inorganic materials 0.000 claims 3
- 238000000034 method Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 4
- 230000008859 change Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
- H01G2/14—Protection against electric or thermal overload
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C10/00—Adjustable resistors
- H01C10/02—Liquid resistors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention belongs to high power discharge engineering device technique field, in particular to a kind of adjustable high-voltage capacitor Quasi-constant power electric discharge device of discharge power.The electric discharge device includes electrion end (1), lucite outer barrel (2), discharge resistance (3), low pressure discharge end (4), temperature-compensating air bag (5), the removable pull bar (6) of metal, liquid resistance sealing plate (7), sealing ring pressing plate (8), low pressure discharge termination place (9), removable insulating supporting (10), liquid resistance regulation handle (11), insulation supporting cylinder (12)；The discharge resistance of device of the present invention uses the adjustable liquid resistance of resistance, discharge process is divided into several time phases, when each stage starts by discharge resistance regulation to specified numerical value, realize discharge power approximate constant in whole discharge time, discharge time is greatly shortened, improves the operating efficiency of high power capacitor system.
Description
Technical field
The invention belongs to high power discharge engineering device technique field, in particular to a kind of adjustable high-tension electricity of discharge power
Container Quasi-constant power electric discharge device.
Background technology
High-voltage capacitor has in fields such as high power pulse modulator, electromagnetic railgun, high power laser lights widely should
With.For high-energy high-voltage capacitor, its charging voltage reaches tens of kilovolts at present, and storage energy reaches tens of kilojoules.When should
With the device of such capacitor after charging complete, if capacitor energy not over follow-up modulator, laser or
Railgun even load regular picture, and, it is necessary to using electric discharge device during the energy for the storage that needs to release in advance.Due to the energy released
Measure that larger, discharge voltage is higher, typically using being discharged after multiple solid state resistance connection in series-parallel as discharge resistance, but this kind of feelings
, it is necessary to which resistance quantity is more under condition, volume, the weight of electric discharge device are larger；Also water resistance can be used to be carried out as discharge resistance
Electric discharge, water resistance have a larger power capacity, therefore volume compact, in light weight, but there is also a problem, current water power
Hinder electric discharge device resistance can not on-line control, guiding discharge power is very big when initial, and with the reduction of condenser voltage, is putting
Electric later stage, discharge current substantially diminish, and energy time of releasing dramatically increases.Therefore it is how compact, in light weight in device volume
Under it is required that, the average discharge power of electric discharge device is improved, the discharge power in later stage of especially discharging, and then improve capacitor system
Operating efficiency, be an active demand in such electric discharge device practical application.
The content of the invention：
It is an object of the present invention in view of the above-mentioned problems, propose a kind of accurate permanent work(of the adjustable high-voltage capacitor of discharge power
Rate electric discharge device, the discharge resistance of described device use the adjustable liquid resistance of resistance, and discharge process is divided into several time ranks
Section, when each stage starts by discharge resistance regulation to numerical value is specified, realize that discharge power approximation is protected in whole discharge time
Hold constant, greatly shorten discharge time, improve the operating efficiency of high power capacitor system.
To achieve the above object, the technical solution adopted by the present invention is：A kind of adjustable high-voltage capacitor of discharge power is accurate
Invariable power electric discharge device, the electric discharge device include electrion end 1, lucite outer barrel 2, discharge resistance 3, low pressure discharge end
4th, temperature-compensating air bag 5, metal may move pull bar 6, liquid resistance sealing plate 7, sealing ring pressing plate 8, low pressure discharge termination place
9th, insulating supporting 10, liquid resistance regulation handle 11, insulation supporting cylinder 12 be may move；The electrion end 1 is one and carried
The cylindrical metal cap of metal tip, its one end are threaded, and can screw in lucite outer barrel 2, are played conductive and sealing
Effect；The lucite outer barrel 2 is a cylindrical drum, liquid resistance solution is contained with it, as discharge resistance 3；It is described
Low pressure discharge end 4 is a cylindrical piston, and N number of aperture is provided with vertically in its circumferential edges, N >=3, and cylindrical piston can be with
Along lucite outer barrel 2 inwall slide, when piston move liquid resistance solution can by aperture along piston both sides oneself
By flowing, play a part of adjusting the resistance of discharge resistance 3；The temperature-compensating air bag 5 is one inside low pressure discharge end 4
Cylindrical cavity, the aperture that the cylindrical cavity is provided with by facing the side end face of electrion end 1 one at low pressure discharge end 4
Feed flow bulk resistor solution comes in and goes out, and when the temperature of discharge resistance 3 changes, the heat expansion by air in temperature-compensating air bag 5 is cold
The pressure inside electric discharge device is alleviated in contracting, improves device functional reliability；The metal may move the one end of pull bar 6 and low pressure discharge
The connection of end 4, the other end is connected after passing through the perforate at the center of liquid resistance sealing plate 7 with removable insulating supporting 10, described removable
Dynamic insulating supporting 10 is a cylindrical piston for carrying front support boss, in insulation supporting cylinder 12, with liquid electric
Resistance regulation handle 11 connects, and the removable front support boss of insulating supporting 10 is used to fix the removable pull bar 6 of metal, simultaneously
Ensuring that metal is removable has enough insulating safety distances between pull bar 6 and liquid resistance regulation handle 11；The liquid resistance
Sealing plate 7 is used to seal the liquid resistance solution in lucite outer barrel 2, while plays connection lucite outer barrel 2 and insulation
The effect of support tube 12；Perforate at the center of liquid resistance sealing plate 7 is provided with close to the side of insulation supporting cylinder 12 close
Seal, and compressed by sealing ring cover plate 8, it is ensured that liquid resistance solution will not pass through the perforate at the center of liquid resistance sealing plate 7
Leak into insulation supporting cylinder 12；The insulation supporting cylinder 12 is that an one end is closed, and the cylindrical drum of one end open, be open side
It is connected with liquid resistance sealing plate 7, one of groove of the notch, the liquid is axially provided with the side wall of the insulation supporting cylinder 12
Resistance adjustment handle 11 by the groove of the notch stretch out insulation supporting cylinder 12 and can be along the groove of the notch along electric discharge device axle
To movement, while pull bar 6 may move by metal and drive low pressure discharge end 4 to move, realize the regulation of discharge resistance 3；In metal
Removable pull bar 6 is provided with earth point 9 close to one end of liquid resistance regulation handle 12, and external ground wire is through the groove of the notch with being grounded
The connection of point 9.
Preferably, the material that the electrion end 1, low pressure discharge end 4, the removable pull bar 6 of metal use is copper or aluminium
Deng the good conductor of electricity.
Preferably, the outside of lucite outer barrel 2 is provided with the scale of regulation discharge power, when the scale is by electric discharge
Between and discharge resistance resistance mark, low pressure discharge end 4 can be adjusted at regular intervals to next scale, to ensure to discharge work(
Rate is approximately steady state value.
Preferably, as condenser capacitance C=10mF, voltage U0During=5kV, the scale in the outside of lucite outer barrel 2 is pressed
Discharge time is labeled as 20s, 40s, 60s, 80s, 90s, 100s, corresponding resistance be respectively 20k Ω, 14.3k Ω, 8k Ω,
2.7k Ω, 300 Ω and 2 Ω.
Preferably, the liquid resistance solution that discharge resistance 3 uses uses deionized water and ethylene glycol mixture, makes it have
Good cryogenic property.
The present invention is based on following principle：The energy of capacitor storage passes through between electrion end 1 and low pressure discharge end 4
Liquid discharge resistance 3 carries out energy and released, and when discharging initial, low pressure discharge end 4 is located at close to the side of insulation supporting cylinder 12, this
When discharge resistance resistance it is larger, the phase, discharge resistance also should progressively adjust reduction, by pushing away with the reduction of voltage after discharge
Liquid resistance regulation handle 11 is drawn to make low pressure discharge end 4 towards the side movement at electrion end 1 to reduce the resistance of discharge resistance 3
Value, improves the discharge power in electric discharge later stage, and then realizes discharge power substantially constant in whole discharge process.
Technical scheme has advantages below：
(1) electric discharge device power adjustable section, realize that Quasi-constant power discharges；
(2) electric discharge device is provided with temperature-compensating air bag, and temperature change can be overcome to cause the change of electric discharge device internal pressure
Change, improve device functional reliability；
(3) discharge time is indicated on the outside of electric discharge device and puts resistance value adjusting scale, it is intuitive, clear during use；
(4) electric discharge device is simple in construction, design, manufactures, be easy for installation, discharge effect is good.
Brief description of the drawings
Fig. 1 is the adjustable high-voltage capacitor Quasi-constant power electric discharge device structure chart of discharge power of the present invention；
Fig. 2 is the three-dimensional isometric sectional view of the adjustable high-voltage capacitor Quasi-constant power electric discharge device of discharge power of the present invention；
Fig. 3 is that device of the present invention changes over time comparison diagram with existing apparatus discharge power in embodiment；
Fig. 4 is that device of the present invention changes over time comparison diagram with existing apparatus capacitor residual voltage in embodiment.
Embodiment
The preferred embodiments of the present invention are illustrated below in conjunction with accompanying drawing, it will be appreciated that described herein preferred real
Apply example to be merely to illustrate and explain the present invention, be not intended to limit the present invention.
Embodiment, referring to Fig. 1 and Fig. 2, when filling with electric capacitor in use, because of follow-up load
Device can not work, it is necessary to when energy is released, by the electrion end 1 of the Quasi-constant power electric discharge device and capacitor high-pressure side phase
Overlap joint, now energy is released energy over the ground by electrion end 1 after discharge resistance 3, then through low pressure discharge end 4 on capacitor
Amount.The earth point 9 that wherein low pressure discharge end 4 is may move by metal on pull bar 6 is connected with ground potential.When electric discharge a period of time
Afterwards, voltage reduces on capacitor, and the velocity of discharge slows down, and now drives metal to may move pull bar by liquid resistance regulation handle 11
6 and coupled low pressure discharge end 4, it is moved inside lucite outer barrel 2 to electrion end 1, in low pressure discharge
4 circumferential edges are held to be provided with 4 through holes vertically, liquid resistance solution can be in its both ends free flow during guarantee moves axially
It is dynamic, electrion end 1 and low pressure discharge end 4 resistance between the two are reduced so as to realize, improves the purpose of discharge power；Work as electric capacity
Voltage gradually reduces on device, may gradually reduce the resistance between electrion end 1 and low pressure discharge end 4, in electric discharge final stage
Due to energy very little, discharge power is reduced, but substantially invariable power electric discharge in whole discharge process, therefore referred to as Quasi-constant power is put
Electricity.
Illustrated below with specific example, it is assumed that to C=10mF capacitors, charging voltage U0=5kV, is utilized respectively resistance
Constant electric discharge device and the Quasi-constant power electric discharge device of the present invention carry out energy and released, and are r from initial discharge resistance0=
20kΩ。
In the case of discharge resistance is constant, discharge power can calculate according to following formula：
In the case of the present invention, 0~t is divided time into1, t1~t2..., t5~t6Six periods, each period starting
Moment resistance is respectively R1、R2、R3、R4、R5、R6, calculating the mean power in each discharge time section according to formula is：
In the present embodiment, six adjusting resistance value R of Quasi-constant power electric discharge device are chosen1~R6Respectively 20k Ω, 14.3k
Ω, 8k Ω, 2.7k Ω, 300 Ω and 2 Ω, corresponding time point t1~t6It is 20s, 40s, 60s, 80s, 90s, 100s respectively, incites somebody to action
Six time points and six resistance values as scale mark in the corresponding position that the needs of liquid resistance regulation handle are moved to,
Obtained invariable power electric discharge device and the discharge power comparison diagram of common unit is as shown in Figure 3, it can be seen that using present invention dress
Put in the case of energy abundance, preceding 80s discharge powers are held essentially constant, about 1130W, are discharged for Quasi-constant power；It is and existing
Electric discharge device discharge power is exponentially decayed, and electric discharge is slower.
Residual voltage has been reduced to such as Fig. 4 using voltage on capacitor after apparatus of the present invention electric discharge 100s on electric capacity
0, and still have residual voltage on capacitor after existing apparatus electric discharge 500s, it is seen that had using the discharging efficiency of device of the present invention
Very big raising.
Finally it should be noted that：The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention,
Although the present invention is described in detail with reference to the foregoing embodiments, for those skilled in the art, it still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic.
Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., it should be included in the present invention's
Within protection domain.
High-voltage capacitor Quasi-constant power electric discharge device of the present invention, due to using high-power liquid discharge resistance, electric discharge
Power adjustable section designs, the electric discharge device by original discharge power with time exponential damping, and optimization is changed to existing electric discharge
Power is the electric discharge device of Quasi-constant power, substantially reduces the time of electric discharge.Simultaneously in electric discharge device, temperature-compensating gas is designed with
Capsule, the influence expanded with heat and contract with cold to electric discharge device for overcoming temperature change to be formed；The quarter of the guaranteed Quasi-constant power electric discharge of electric discharge device
Degree design, divides electric discharge to the different time stage with reference to scale, is had what is be directed to be adjusted to discharge resistance respectively according to result of calculation.Should
Electric discharge device is simple in construction, reasonable in design, easy to use, and the raising for high power capacitor system operating efficiency has important meaning
Justice.
Claims (5)
- A kind of 1. adjustable high-voltage capacitor Quasi-constant power electric discharge device of discharge power, it is characterised in that：The electric discharge device bag Include electrion end (1), lucite outer barrel (2), discharge resistance (3), low pressure discharge end (4), temperature-compensating air bag (5), gold The removable pull bar (6) of category, liquid resistance sealing plate (7), sealing ring pressing plate (8), low pressure discharge terminate place (9), may move absolutely Edge support (10), liquid resistance regulation handle (11), insulation supporting cylinder (12)；The electrion end (1) is one with gold Belong to the cylindrical metal cap at tip, its one end is threaded, and can screw in lucite outer barrel (2), is played conductive and sealing Effect；The lucite outer barrel (2) is a cylindrical drum, liquid resistance solution is contained with it, as discharge resistance (3)； The low pressure discharge end (4) is a cylindrical piston, is provided with N number of aperture, N >=3 vertically in its circumferential edges, cylinder is lived Plug can slide along the inwall of lucite outer barrel (2), and when piston moves, liquid resistance solution can be by aperture along work Fill in both sides to flow freely, play a part of adjusting discharge resistance (3) resistance；The temperature-compensating air bag (5) is one positioned at low The internal cylindrical cavity of discharge end (4) is pressed, the cylindrical cavity in low pressure discharge end (4) by facing electrion end The aperture feed flow bulk resistor solution that (1) one side end face is provided with comes in and goes out, and when discharge resistance (3) temperature changes, passes through temperature The pressure alleviated inside electric discharge device of expanding with heat and contract with cold of compensation air bag (5) interior air, improves device functional reliability；The metal Removable pull bar (6) one end is connected with low pressure discharge end (4), after the other end passes through the perforate at liquid resistance sealing plate (7) center It is connected with removable insulating supporting (10), the removable insulating supporting (10) is a cylinder for carrying front support boss Piston, in insulation supporting cylinder (12), it is connected with liquid resistance regulation handle (11), the removable insulating supporting (10) Front support boss is used to fix the removable pull bar (6) of metal, while ensures that metal may move pull bar (6) and be adjusted with liquid resistance Handle has enough insulating safety distances between (11)；The liquid resistance sealing plate (7) is used to seal lucite outer barrel (2) Interior liquid resistance solution, while play a part of connecting lucite outer barrel (2) and insulation supporting cylinder (12)；In the liquid The perforate at resistance sealing plate (7) center is provided with sealing ring close to the side of insulation supporting cylinder (12), and passes through sealing ring cover plate (8) compress, it is ensured that liquid resistance solution will not leak into insulation supporting cylinder by the perforate at liquid resistance sealing plate (7) center (12) in；The insulation supporting cylinder (12) is that an one end is closed, and the cylindrical drum of one end open, opening side and liquid resistance are close Shrouding (7) is connected, and one of groove of the notch, the liquid resistance regulation are axially provided with the side wall of the insulation supporting cylinder (12) Handle (11) stretches out insulation supporting cylinder (12) by the groove of the notch and can moved along the groove of the notch along the axial direction of electric discharge device It is dynamic, while pull bar (6) may move by metal and drive low pressure discharge end (4) mobile, realize the regulation of discharge resistance (3)；In gold The removable pull bar (6) of category is provided with earth point (9) close to one end of liquid resistance regulation handle (12), and external ground wire passes through otch Groove is connected with earth point (9).
- 2. the adjustable high-voltage capacitor Quasi-constant power electric discharge device of discharge power according to claim 1, it is characterised in that：Institute State electrion end (1), low pressure discharge end (4), metal may move the material that uses of pull bar (6) as copper or aluminium.
- 3. the adjustable high-voltage capacitor Quasi-constant power electric discharge device of discharge power according to claim 1, it is characterised in that：Institute The scale that regulation discharge power is provided with the outside of lucite outer barrel (2) is stated, the scale is hindered by discharge time and discharge resistance Value mark, low pressure discharge end (4) can be adjusted at regular intervals to next scale, be approximately constant to ensure discharge power Value.
- 4. the adjustable high-voltage capacitor Quasi-constant power electric discharge device of discharge power according to claim 3, it is characterised in that：When Condenser capacitance C=10mF, voltage U0During=5kV, the scale on the outside of lucite outer barrel (2) is labeled as by discharge time 20s, 40s, 60s, 80s, 90s, 100s, corresponding resistance are respectively 20k Ω, 14.3k Ω, 8k Ω, 2.7k Ω, 300 Ω and 2 Ω。
- 5. the adjustable high-voltage capacitor Quasi-constant power electric discharge device of discharge power according to claim 1, it is characterised in that：Put The liquid resistance solution that resistance (3) uses uses deionized water and ethylene glycol mixture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710003765.4A CN106653357B (en) | 2017-01-04 | 2017-01-04 | A kind of adjustable high-voltage capacitor Quasi-constant power electric discharge device of discharge power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710003765.4A CN106653357B (en) | 2017-01-04 | 2017-01-04 | A kind of adjustable high-voltage capacitor Quasi-constant power electric discharge device of discharge power |
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| Publication Number | Publication Date |
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| CN106653357A CN106653357A (en) | 2017-05-10 |
| CN106653357B true CN106653357B (en) | 2018-03-20 |
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| CN110854834A (en) * | 2019-11-22 | 2020-02-28 | 南京派格测控科技有限公司 | Method for improving voltage reduction speed of power supply and bleeder circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1859823A (en) * | 2005-04-29 | 2006-11-08 | 王和庆 | A type quick discharger |
| CN201191308Y (en) * | 2008-05-18 | 2009-02-04 | 锦州百纳电气有限公司 | Large power super capacitor test system |
| CN103267934A (en) * | 2013-05-08 | 2013-08-28 | 国家电网公司 | Portable direct current test discharging rod |
| CN104409188A (en) * | 2014-12-16 | 2015-03-11 | 中国工程物理研究院流体物理研究所 | Pneumatic adjustable water resistor |
| CN104865468A (en) * | 2015-05-15 | 2015-08-26 | 中国人民解放军理工大学 | Device and method for measuring shielding effectiveness of electromagnetic pulse of thunder and lightning |
-
2017
- 2017-01-04 CN CN201710003765.4A patent/CN106653357B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1859823A (en) * | 2005-04-29 | 2006-11-08 | 王和庆 | A type quick discharger |
| CN201191308Y (en) * | 2008-05-18 | 2009-02-04 | 锦州百纳电气有限公司 | Large power super capacitor test system |
| CN103267934A (en) * | 2013-05-08 | 2013-08-28 | 国家电网公司 | Portable direct current test discharging rod |
| CN104409188A (en) * | 2014-12-16 | 2015-03-11 | 中国工程物理研究院流体物理研究所 | Pneumatic adjustable water resistor |
| CN104865468A (en) * | 2015-05-15 | 2015-08-26 | 中国人民解放军理工大学 | Device and method for measuring shielding effectiveness of electromagnetic pulse of thunder and lightning |
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