CN115102037B - Gas switch with discharge current monitoring function - Google Patents
Gas switch with discharge current monitoring function Download PDFInfo
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- CN115102037B CN115102037B CN202210692816.XA CN202210692816A CN115102037B CN 115102037 B CN115102037 B CN 115102037B CN 202210692816 A CN202210692816 A CN 202210692816A CN 115102037 B CN115102037 B CN 115102037B
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- Prior art keywords
- gas switch
- discharge current
- current monitoring
- monitoring function
- shell
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T1/00—Details of spark gaps
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T1/00—Details of spark gaps
- H01T1/12—Means structurally associated with spark gap for recording operation thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/10—Nuclear fusion reactors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention relates to a gas switch of a pulse power source, in particular to a gas switch with a discharge current monitoring function, which is used for solving the defects that the existing gas switch discharge current monitoring device can not accurately reflect the discharge time and the discharge current of the switch, has high manufacturing cost and complex system, is difficult to fixedly connect and is not suitable for batch use. The gas switch with the discharge current monitoring function comprises a shell, two high-voltage electrodes, a probe arranged on the side wall of the shell, an integrator and an oscilloscope; the invention integrates the gas switch shell and the current measuring probe into a whole, has compact structure, realizes the discharge current monitoring function, and can not influence the original functions of sealing, insulating and electrode supporting of the gas switch shell.
Description
Technical Field
The invention relates to a gas switch of a pulse power source, in particular to a gas switch with a discharge current monitoring function.
Background
The fast pulse linear transformer driving source or the fast Marx generator can directly generate high-power pulse with the front edge of hundreds of nanoseconds to hundreds of nanoseconds, and has important application prospect in the research of the fields of Z pinch inertia constraint fusion, high-energy density physics and the like. Large pulsed power sources often contain a large number of gas switches. The gas switch needs to trigger discharge according to a preset time sequence, and the discharge time is required to shake less than a few nanoseconds, so that the energy stored by the driving source is ensured to be synchronously released to the load, and the superposition of pulse power is realized. For example, a Z800 device designed by san diea national laboratory in usa requires synchronous discharge of 16.2 tens of thousands of high voltage high current gas switches operating at ±100 kV. Because the gas discharge has certain randomness, the trigger on-state switching time also has dispersity, and the gas switch has fault states of self discharge, late trigger, no trigger and the like. As the scale of pulse power devices increases, the number of switches increases, and problems of switch discharge closing time, fault diagnosis and positioning are more and more prominent. The problems of determining the closing time of the gas switch discharge, diagnosing and positioning the gas switch faults become one of the bottlenecks restricting the technical development of the pulse power driving source.
In order to reduce the inductance of a discharge loop in a fast pulse power source, the gas switch has compact structure, high working voltage, small insulation size between positive and negative high-voltage electrodes and small axial length of a shell. In particular, the axial length of the gas switch insulating shell in the driving source of the fast pulse linear transformer is generally smaller than 150mm, and the withstand voltage is 200kV. Therefore, the judgment of the discharge state and the closing time of the gas switch requires a detector with quick response and small volume. The method of testing discharge voltage waveforms by connecting high-voltage electrodes with a resistor divider is difficult to use on large-scale gas switches. The Chinese engineering physical institute uses optical fiber and CCD camera to monitor whether the switch is on, the method can only reflect the on state of the switch, can reflect the self-discharge of the switch, but can not accurately reflect the discharge time and the discharge current of the switch. The university of Michigan uses optical fibers to collect the switch discharge luminescence and uses photomultiplier tubes (PMTs) to convert the switch discharge signals. The method is photoelectric-isolated, the leading-out module is convenient, but is influenced by factors such as the change of the arc position of the switch, the response characteristic of the photoelectric detector and the like, the current of the switch in actual conduction cannot be reflected, and a large number of PMTs are adopted to monitor the discharge state of the switch, so that the manufacturing cost is high, and the system is complex. The northwest institute of nuclear technology Sun Tieping et al uses a B-dot probe to collect the start time of the switch discharge and gives the conclusion that the dispersibility of the switch discharge of the twelve-branch parallel LTD module is gaussian (Sun Tieping, et al. Influence of switch synchronization in the fast-leading-edge linear pulse transformer drive source module on the discharge current [ J ] intense laser and particle beam 2010,22 (8)). The san diego division of california university in the united states adopts a time-integrated D-dot probe to test the potential inversion of a trigger electrode of a switch to judge the closing moment of the switch, and the closing dispersivity of 20 switches is 3.6ns under the typical synchronous discharge condition. The B-dot probe and the D-dot probe can reflect the information of the discharge state, the closing time and the like of the switch, but the probes are separated from the switch, the probes are difficult to fix and connect in an LTD sensing cavity with limited space, and the waveforms measured by the probes cannot well reflect the current amplitude due to inconsistent fixed positions of the B-dot probe and the D-dot probe, so that the sensor is not suitable for batch use.
Disclosure of Invention
The invention aims to solve the defects that the existing gas switch discharge current monitoring device can not accurately reflect the switch discharge time and discharge current, has high manufacturing cost and complex system, is difficult to fixedly connect and is not suitable for batch use, and provides a gas switch with a discharge current monitoring function.
In order to solve the defects existing in the prior art, the invention provides the following technical solutions:
the utility model provides a gas switch with discharge current monitoring function, includes shell and two high-voltage electrode, its characterized in that: the probe is arranged on the side wall of the shell, and the integrator and the oscilloscope are arranged on the side wall of the shell;
the shell comprises an insulating cylinder, two high-voltage electrodes are respectively fixed at two ends of the insulating cylinder, and a sealing cavity is formed between the two high-voltage electrodes and the inner wall of the insulating cylinder;
the probe is located in a groove formed in the outer wall of the insulating cylinder, the probe comprises a printed circuit board arranged parallel to the central line of the insulating cylinder, a coil and a cable connector, the coil and the cable connector are arranged on the printed circuit board, one end of the coil is sequentially electrically connected with the integrator and the oscilloscope through the core wire of the cable connector, and the other end of the coil is electrically connected with the grounding end of the cable connector.
Further, the grooves are equidistant from the two high-voltage electrodes of the gas switch to be monitored.
Further, the radial depth of the groove is greater than the thickness of the printed circuit board.
Further, the printed circuit board is fixed in the groove in a manner of insulating sealant encapsulation.
Further, the outer wall of the insulating cylinder is provided with a plurality of radial annular grooves which are distributed along the axial direction, so that the external insulating strength of the insulating cylinder is improved.
Further, the housing is made of nylon or plexiglas or polycarbonate or polyetherimide.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention relates to a gas switch with a discharge current monitoring function, which comprises a shell, two high-voltage electrodes, a probe arranged on the side wall of the shell, an integrator and an oscilloscope, wherein the probe is arranged on the side wall of the shell; the shell plays a role of sealing gas, and is used as a supporting structural member of the high-voltage electrode, the probe is used for inducing a discharge current pulse signal, outputting a current waveform through the integrator and finally displaying the current waveform on the oscilloscope; numbering probes of the gas switch shells, acquiring fault gas switch positions through current waveform numbering, and acquiring discharge current through waveform amplitude; the invention integrates the gas switch shell and the current measuring probe into a whole, has compact structure, realizes the discharge current monitoring function, and can not influence the original functions of sealing, insulating and electrode supporting of the gas switch shell.
(2) The position of the probe in the gas switch with the discharge current monitoring function is determined by the groove on the insulating cylinder, the grooving size is ensured to be consistent by machining, and the coil is made of the printed circuit board, so that the waveform consistency of the gas switch shell test is good, and the gas switch is suitable for mass application, and is particularly suitable for FLTD type pulse driving sources.
(3) The gas switch with the discharge current monitoring function has good adaptability, and in the application occasions without the requirement of discharge current monitoring, the probe on the shell can be disconnected with the integrator and the oscilloscope, so that the use of the gas switch is not affected.
Drawings
FIG. 1 is a schematic diagram of a gas switch with discharge current monitoring function according to an embodiment of the present invention;
FIG. 2 is a schematic view of the probe in the embodiment of FIG. 1;
FIG. 3 is a graph showing the current waveform of the probe in the embodiment of FIG. 1 when the probe detects a gas switch breakdown discharge;
fig. 4 is a graph of current waveforms when the probe monitors a breakdown discharge of twenty-three gas switches in the embodiment of fig. 1.
The reference numerals are explained as follows: 1-a housing, 11-a radial annular groove; 2-probe, 21-printed circuit board, 22-cable connector; a 3-integrator; 4-oscilloscope.
Detailed Description
The invention is further described below with reference to the drawings and exemplary embodiments.
Referring to fig. 1, a gas switch with a discharge current monitoring function includes a housing 1, two high voltage electrodes, a probe 2, an integrator 3, and an oscilloscope 4.
The shell 1 is made of polyetherimide, the shell 1 comprises an insulating cylinder, the insulating cylinder is cylindrical, the outer diameter is 107mm, the inner diameter is 70mm, the axial length is 133mm, and a plurality of radial annular grooves 11 which are axially distributed are formed in the outer wall of the insulating cylinder 1; the two high-voltage electrodes are fixed at the two ends of the insulating cylinder, a sealing cavity is formed between the two high-voltage electrodes and the inner wall of the insulating cylinder, SF6 gas with the pressure of 0.1MPa is arranged outside the sealing cavity, and air with the pressure of 0.4MPa is arranged inside the sealing cavity.
Referring to fig. 2, the probe 2 is positioned in a groove on the outer wall of the insulation cylinder, and the probe 2 comprises a printed circuit board 21 arranged parallel to the central line of the insulation cylinder, and a coil and a cable connector 22 arranged on the printed circuit board 21; coil area, turns and shape are determined by the discharge current peak, leading edge and integrator parameters of the gas switch; one end of the coil is sequentially connected with the integrator 3 and the oscilloscope 4 through the core wire of the cable joint 22, and the other end of the coil is connected with the grounding pin of the cable joint 22.
In this embodiment, the gas switch with the discharge current monitoring function is a multi-gap gas switch of a linear transformer driving source (FLTD for short), and the voltage born by the housing 1 reaches ±200kV; the length of the printed circuit board 21 is 11mm and the width7mm, 1.6mm thick, adopts double-layer printing, the coil is a 2-turn square coil, and the coil surrounding area is 26mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The integrator 3 has an integration time constant of 5us.
The twenty-three sets of gas switches with the discharge current monitoring function are applied to a single-stage 1MA FLTD module, when a certain gas switch generates self-discharge in the charging process, the probe 2 integrated on the insulating cylinder can detect the discharge current of the branch, and coils on other gas switches do not have signal output. The waveforms acquired by the oscilloscope 4 are shown in fig. 3. The position of the gas switch with self-discharge can be positioned through the number (address) of the probe 2, the discharge current waveform is a short-circuit oscillation waveform, and other gas switches are not discharged. When twenty-three gas switches can discharge synchronously, the waveform acquired by the oscilloscope 4 is shown in fig. 4. The starting time of each gas switch discharge can be obtained through the discharge current waveform, and the time dispersion of the gas switch discharge is evaluated.
When the discharge current does not need to be monitored, the probe 2 on the shell 1 can be disconnected from the integrator 3 and the oscilloscope 4, and the gas switch is not affected.
The foregoing embodiments are merely for illustrating the technical solutions of the present invention, and not for limiting the same, and it will be apparent to those skilled in the art that modifications may be made to the specific technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, without departing from the spirit of the technical solutions protected by the present invention.
Claims (6)
1. The utility model provides a gas switch with discharge current monitoring function, includes shell (1) and two high-voltage electrode, its characterized in that: the device also comprises a probe (2) arranged on the side wall of the shell (1), an integrator (3) and an oscilloscope (4);
the shell (1) comprises an insulating cylinder, two high-voltage electrodes are respectively fixed at two ends of the insulating cylinder, and a sealing cavity is formed between the two high-voltage electrodes and the inner wall of the insulating cylinder;
the probe (2) is located in a groove formed in the outer wall of the insulating cylinder, the probe (2) comprises a printed circuit board (21) which is parallel to the central line of the insulating cylinder, a coil and a cable connector (22) which are arranged on the printed circuit board (21), one end of the coil is electrically connected with the integrator (3) and the oscilloscope (4) in sequence through the core wire of the cable connector (22), and the other end of the coil is electrically connected with the grounding end of the cable connector (22).
2. A gas switch with discharge current monitoring function according to claim 1, characterized in that: the axial distance between the groove and the two high-voltage electrodes of the gas switch to be monitored is equal.
3. A gas switch with discharge current monitoring function according to claim 2, characterized in that: the radial depth of the groove is greater than the thickness of the printed circuit board (21).
4. A gas switch with discharge current monitoring function according to claim 3, characterized in that: the printed circuit board (21) is fixed in the groove in a manner of insulating sealant encapsulation.
5. A gas switch with discharge current monitoring function according to any one of claims 1 to 4, characterized in that: the outer wall of the insulating cylinder is provided with a plurality of radial annular grooves (11) which are axially distributed.
6. A gas switch with discharge current monitoring function according to claim 5, wherein: the shell (1) is made of nylon or organic glass or polycarbonate or polyetherimide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210692816.XA CN115102037B (en) | 2022-06-17 | 2022-06-17 | Gas switch with discharge current monitoring function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210692816.XA CN115102037B (en) | 2022-06-17 | 2022-06-17 | Gas switch with discharge current monitoring function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115102037A CN115102037A (en) | 2022-09-23 |
| CN115102037B true CN115102037B (en) | 2023-07-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210692816.XA Active CN115102037B (en) | 2022-06-17 | 2022-06-17 | Gas switch with discharge current monitoring function |
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| Country | Link |
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| CN (1) | CN115102037B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565641A (en) * | 2011-12-29 | 2012-07-11 | 西北核技术研究所 | Optical fiber detection system for diagnosing parameter of multi-gap gas switch |
| CN113702875A (en) * | 2021-08-06 | 2021-11-26 | 西安交通大学 | Gas switch self-discharge positioning method of fast pulse linear transformer driving source |
| CN114545221A (en) * | 2022-02-25 | 2022-05-27 | 西安交通大学 | Gas switch insulation recovery characteristic test experimental device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11879927B2 (en) * | 2018-12-18 | 2024-01-23 | S&C Electric Company | Triggered vacuum gap fault detection methods and devices |
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2022
- 2022-06-17 CN CN202210692816.XA patent/CN115102037B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565641A (en) * | 2011-12-29 | 2012-07-11 | 西北核技术研究所 | Optical fiber detection system for diagnosing parameter of multi-gap gas switch |
| CN113702875A (en) * | 2021-08-06 | 2021-11-26 | 西安交通大学 | Gas switch self-discharge positioning method of fast pulse linear transformer driving source |
| CN114545221A (en) * | 2022-02-25 | 2022-05-27 | 西安交通大学 | Gas switch insulation recovery characteristic test experimental device |
Non-Patent Citations (1)
| Title |
|---|
| "用于FLTD 的陶瓷封装多间隙气体开关";姜晓峰;《强激光与粒子束》;全文 * |
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| Publication number | Publication date |
|---|---|
| CN115102037A (en) | 2022-09-23 |
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