CN101846721A - Measuring device for direct current breakdown voltage of gas discharge tube and method thereof - Google Patents
Measuring device for direct current breakdown voltage of gas discharge tube and method thereof Download PDFInfo
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- CN101846721A CN101846721A CN201010199158A CN201010199158A CN101846721A CN 101846721 A CN101846721 A CN 101846721A CN 201010199158 A CN201010199158 A CN 201010199158A CN 201010199158 A CN201010199158 A CN 201010199158A CN 101846721 A CN101846721 A CN 101846721A
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Abstract
The invention relates to measuring device for direct current breakdown voltage of a gas discharge tube and a method thereof, the measuring device comprises a man-machine interaction parameter setting and measuring result display unit, a microcomputer controlling and measuring unit, an adjustable rise speed DC power source, a current-limiting unit, gas discharge tube load, a microcurrent differential sensor and a voltage sensor, wherein, the man-machine interaction parameter setting and measuring result display unit is composed of a liquid crystal and a keyboard. In the invention, the microcurrent differential sensor is adopted to rapidly and accurately judge a microcurrent conversation signal of the gas discharge tube from an insulation state to a conducting state under the condition that the gas discharge tube is applied with DC voltage in a stated rise speed, wherein, the amplitude of the microcurrent conversation signal is less than 1mA; an A/D collection circuit with high-precision peak holding and high resolution is adopted to realize accurate measurement of the direct current breakdown voltage of the gas discharge tube, wherein, the metering precision is higher than 0.5%; and rapid extraction of a microcurrent signal reduces consumption of the DC voltage on an emission material on the surface of the electrodes of the gas discharge tube, and the inconsistency for measuring the direct current breakdown voltage of the gas discharge tube is lower than 0.5%.
Description
Technical field
The invention belongs to gas-discharge tube electrical performance test device and method, particularly a kind of gas-discharge tube dc breakdown voltage measuring apparatus and method.
Background technology
Gas-discharge tube is mainly used in railway communication; in the equipment such as post and telecommunications; to prevent that equipment is subjected to overvoltage impact and lightning strike and damages; it is most widely used a kind of switch overvoltage protection device in the lightning protection equipment; no matter be the lightning protection of power of alterating and direct current or the lightning protection of various signal circuits, can lightning current be released into the earth with it.
The dc breakdown voltage measurement of gas-discharge tube is the important link in the gas-discharge tube production technology, and it is determining the level of gas-discharge tube overvoltage protection.The dc breakdown voltage measuring apparatus is exactly a dc breakdown voltage of wanting accurate measurement gas discharge tube, to determine the voltage protection level of gas-discharge tube.When the DC voltage that puts on the gas-discharge tube two ends raise gradually, gas-discharge tube can change conducting state into by original state of insulation, and the DC voltage that correspondence applies is exactly the dc breakdown voltage of gas-discharge tube.When gas-discharge tube was carried out the dc breakdown voltage measurement, more little by the electric current of gas-discharge tube, the dc breakdown voltage measurement was just more little to the performance impact of gas-discharge tube.Because if the electric current by gas-discharge tube is big more, big more to the state influence of the electronics powder of gas-discharge tube electrode surface, the dc breakdown voltage that this will directly influence gas-discharge tube makes gas-discharge tube dc breakdown magnitude of voltage generation marked change next time.
The determination methods that the gas-discharge tube state of insulation is converted to conducting state is to realize by detecting the little electric current that passes through.Traditional detection method has following two kinds: a kind of method be with loop that gas-discharge tube is connected in insert photoelectric coupled device, its principle of work is when the electric current that flows through gas-discharge tube reaches the drive current of photoelectric coupled device, photoelectric coupled device is luminous, and the control signal of output gas-discharge tube conducting, by signals collecting or recording device records or measurement magnitude of voltage at this moment, as the dc breakdown voltage of gas-discharge tube; Another kind method is series connection one current sampling resistor in the gas-discharge tube series loop, the input end of a voltage comparator is received in the output of sample resistance, and the level of another input end of voltage comparator can be set in advance, if the voltage at sample resistance two ends is more than or equal to the voltage of setting in advance, then voltage comparator output control signal goes the controlling recording device to carry out the measurement of gas-discharge tube dc breakdown voltage through a photoelectric coupled device again.
The common ground of these two kinds of methods has all adopted photoelectric coupled device to be converted to the detecting unit of conducting state by state of insulation as gas-discharge tube; but because there is following defective in photoelectric coupled device---required drive current big (will reach 10mA-15mA usually) and drive current dispersiveness is also bigger; the less stable that makes the voltage measurement of gas-discharge tube dc breakdown; what is more important is to the consumption of the electronic emission material of gas-discharge tube electrode surface; cause the further variation of gas-discharge tube dc breakdown voltage thus; the accurate dc breakdown voltage of measurement gas discharge tube, thus can't accurately determine the voltage protection level of gas-discharge tube.
Summary of the invention
The purpose of patent of the present invention is to provide a kind of accurately measurement gas discharge dc breakdown voltage and reduces influence to the electronic emission material of gas-discharge tube electrode surface, accurately the gas-discharge tube dc breakdown voltage measuring apparatus and the method for the voltage protection level of marked gas discharge tube.
For achieving the above object, measurement mechanism of the present invention comprises: comprise the setting of man-machine interaction parameter and measurement result display unit and the microcomputer control and the measuring unit that are connected with the measurement result display unit with the setting of man-machine interaction parameter, said microcomputer control comprises control module and the measuring unit that is connected with control module with measuring unit, wherein control module links to each other with adjustable climbing speed direct supply, the high-voltage output end of adjustable climbing speed direct supply is connected with an end of current limliting unit, one end of the other end of current limliting unit and gas-discharge tube load is connected, the other end of gas-discharge tube load is connected with an end of the excitation telefault of little current differential sensor, the other end of excitation telefault is connected with the low pressure end of adjustable climbing speed direct supply, and measuring unit is connected with the inductive coil of little current differential sensor.
Little current differential sensor of the present invention by be wound on high magnetic permeability on annular or the rectangle, excitation telefault and three to four separate inductive coils of electric mutual isolation on the high-frequency magnetic material are formed; Choosing of current limliting unit is to guarantee under the condition of the DC voltage that applies adjustable climbing speed, and the current value by the gas-discharge tube load is not more than 1mA; Microcomputer control and the measuring unit of measuring unit comprise respectively be connected with control module and the voltage divider that is attempted by gas-discharge tube load two ends peak holding circuit and 12 or 16 that are connected with control module A/D Acquisition Circuit, and the inductive coil of little current differential sensor links to each other with control module by d type flip flop.
Measuring method of the present invention is:
1) is provided with by the man-machine interaction parameter and the adjustable climbing speed of measurement result display unit input DC power;
2) control module of microcomputer control and measuring unit receives the adjustable voltage climbing speed signal of the direct supply of man-machine interaction parameter setting and the setting of measurement result display unit, output voltage by digital-to-analog D/A change-over circuit control direct current module, the requirement of gas-discharge tube load dc breakdown voltage measurement is satisfied in the output of the high direct voltage signal of the voltage climbing speed that realization is set;
3) when the output voltage of adjustable climbing speed direct supply makes the gas-discharge tube load be converted to conducting state by state of insulation, produce a zooming voltage signal in the drive coil of little current differential sensor
u 8
4) this zooming voltage signal
u 8In the respective coil of the inductive coil of little current differential sensor, induce the zooming voltage signal of high amplitude
u 9Voltage signal
u 9The control d type flip flop, d type flip flop outputs to the control module of control of control microcomputer and measuring unit, control module stops the control of boosting to adjustable climbing speed direct supply on the one hand, the peak sampling hold circuit work of control survey unit on the other hand keeps the magnitude of voltage that is applied to the gas-discharge tube load and change through overvoltage sensor get off;
5) microcomputer control is carried out data acquisition with the A/D converter of the control module control survey unit of measuring unit to the voltage that is applied to gas-discharge tube load two ends by the voltage sensor conversion;
6) measuring unit of microcomputer control and measuring unit digital signal that A/D converter is obtained multiply by the scale factor of voltage sensor, obtain the dc breakdown voltage of gas-discharge tube load, and be presented on the liquid crystal display of setting of man-machine interaction parameter and measurement result display unit.
The adjustable climbing speed of the direct supply of step 1) is 100V/s, 200V/s, 500V/s or 1000V/s.
The present invention adopts little current differential sensor, the rapid extraction gas-discharge tube is converted to conducting state, the amplitude little current signal less than 1mA by state of insulation, voltage peak holding circuit with pilot-gas discharge tube dc breakdown voltage test device, and by 12 or 16 high-resolution A/D collecting units, the dc breakdown voltage of accurate measurement gas discharge tube; Invented the little current differential sensor of many gears simultaneously, can measure the gas-discharge tube of dc breakdown voltage, improved the accurately fixed and degree of stability of gas-discharge tube dc breakdown voltage measurement from tens volts to several kilovolt range.
Description of drawings
Fig. 1 is that the principle of gas-discharge tube dc breakdown voltage test device of the present invention is formed structure;
Fig. 2 is little current differential sensor construction synoptic diagram of gas-discharge tube state of insulation conversion conducting state of the present invention;
Fig. 3 is the microcomputer control of gas-discharge tube dc breakdown voltage measuring apparatus of the present invention and the theory diagram of the measuring unit 2-2 of measuring unit 2;
Fig. 4 is the control flow of gas-discharge tube dc breakdown voltage measuring apparatus of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
Referring to Fig. 1, gas-discharge tube dc breakdown voltage measuring apparatus of the present invention comprises that the man-machine interaction parameter that liquid crystal and keyboard are formed is provided with and measurement result display unit 1, microcomputer control and measuring unit 2, adjustable climbing speed direct supply 3, current limliting unit 4, gas-discharge tube load 5, little current differential sensor 6 and voltage sensor 7, microcomputer control and measuring unit 2 that the setting of man-machine interaction parameter is connected with measurement result display unit 1, said microcomputer control comprises control module 2-1 and the measuring unit 2-2 that is connected with control module 2-1 with measuring unit 2, wherein control module 2-1 links to each other with adjustable climbing speed direct supply 3, the high-voltage output end of adjustable climbing speed direct supply 3 is connected with an end of current limliting unit 4, one end of the other end of current limliting unit 4 and gas-discharge tube load 5 is connected, the other end of gas-discharge tube load 5 is connected with an end of the excitation telefault 8 of little current differential sensor 6, the other end of excitation telefault 8 is connected with the low pressure end of adjustable climbing speed direct supply 3, and measuring unit 2-2 is connected with the inductive coil 9 of little current differential sensor 6.The selection principle of current limliting unit 4 is to guarantee under the condition of the DC voltage that applies adjustable climbing speed, and the current value by gas-discharge tube load 5 is not more than 1mA.
Referring to Fig. 2, the extraction gas-discharge tube state of insulation of gas-discharge tube dc breakdown voltage measuring apparatus of the present invention constitutes to little current differential sensor 6 of the switching signal of conducting state two parts telefault by electric mutual isolation, first connects with gas-discharge tube load 5 for excitation telefault 8, excitation telefault 8; Another part of little current differential current sensor 6 is an inductive coil 9, it has a plurality of inductive coil 9-1,9-2,9-3 ... form, consider gas-discharge tube dc breakdown voltage from tens volts to several kilovolts scope, the inductive coil 9 of little current differential current sensor 6 generally is made up of 3 to 4 inductive coils; Simultaneously, for the little current signal of fast detecting gas-discharge tube state of insulation to the conducting state conversion, the excitation telefault 8 of little current differential sensor 6 and inductive coil 9 all are wound on high magnetic permeability, the high-frequency magnetic material, and the profile of magnetic material can be that annular or rectangle all can.
Referring to Fig. 3, the microcomputer control of gas-discharge tube dc breakdown voltage measuring apparatus of the present invention comprises peak holding circuit 11 and one 12 A/D Acquisition Circuit 12 with the measuring unit 2-2 of measuring unit 2, and the inductive coil 9 of little current differential sensor 6 links to each other with control module 2-1 by d type flip flop 10.Its measuring principle is as follows: the control module 2-1 of microcomputer control and measuring unit 2 receives gas-discharge tube load 5 that the inductive coil 9 from little current differential sensor 6 extracted is changed into conducting state by state of insulation fast transient signal by d type flip flop 10, this signal makes d type flip flop 10 trigger upset, the triggering energizing signal of d type flip flop 10 inputs to the control module 2-1 of microcomputer control and measuring unit 2, stop the control of boosting to adjustable climbing speed direct supply 3, and make the output signal of microcomputer control and the peak holding circuit 11 automatic sustaining voltage sensors 7 of the measuring unit 2-2 of measuring unit 2, start 12 work of A/D Acquisition Circuit simultaneously, to what measure by voltage sensor 7, the individual high voltage signal that is applied to gas-discharge tube load 5 two ends is measured.The effect of voltage sensor 7 is voltage signals that the high voltage signal that will be applied to the gas-discharge tube two ends is converted to 12 energy measurements of A/D Acquisition Circuit, and wherein the input high voltage signal of voltage sensor 7 is the scale factor of voltage sensor 7 with the ratio of output LOW voltage signal amplitude.The dc breakdown voltage of gas-discharge tube is the scale factor that the output voltage values of voltage sensor 7 multiply by voltage sensor 7.
Referring to Fig. 4, the control flow of gas-discharge tube dc breakdown voltage measuring apparatus of the present invention is:
(1) by the man-machine interaction parameter setting of gas-discharge tube dc breakdown voltage measuring apparatus and the adjustable climbing speed of measurement result display unit 1 input DC power, adjustable climbing speed can be chosen as 100V/s, 200V/s, 500V/s or 1000V/s.
(2) the control module 2-1 of microcomputer control and measuring unit 2 receives the adjustable voltage climbing speed signal of the direct supply of man-machine interaction parameter setting and 1 setting of measurement result display unit, output voltage by digital-to-analog D/A change-over circuit control direct current module, realize the output of the high direct voltage signal of different voltage climbing speeds, satisfy the requirement of gas-discharge tube load 5 dc breakdown voltage measurements.
(3) when the output voltage of adjustable climbing speed direct supply 3 makes gas-discharge tube load 5 be converted to conducting state by state of insulation, produce a zooming voltage signal in the drive coil 8 of little current differential sensor 6
u 8
(4) zooming voltage signal
u 8In the respective coil of the inductive coil 9 of little current differential sensor 6, just induce the zooming voltage signal of high amplitude
u 9Voltage signal
u 9Control d type flip flop 10, the output switching activity signal of d type flip flop 10 is to the control module 2-1 of control microcomputer control with measuring unit 2, stop the control of boosting on the one hand to adjustable climbing speed direct supply 3, peak sampling hold circuit 11 work of control survey unit 2-2 keep the magnitude of voltage that is applied to gas-discharge tube load 5 and export through overvoltage sensor 7 get off on the other hand.
(5) microcomputer control is carried out data acquisition with 12 pairs of low voltage signals that converted by the high voltage by being applied to gas-discharge tube load 5 two ends of voltage sensor 7 outputs of analog/digital A/D converter of the control module 2-1 control survey unit 2-2 of measuring unit 2.
(6) microcomputer control and measuring unit 2 measuring unit 2-2 digital signal that A/D converter 12 is obtained multiply by the scale factor of voltage sensor 7, obtain the dc breakdown voltage of gas-discharge tube load 5, and be presented on the liquid crystal display of setting of man-machine interaction parameter and measurement result display unit 1.
The object of the present invention is to provide a kind of gas-discharge tube to be converted to the judgement new method of little current differential sensor of conducting state and the measuring method and the measurement mechanism of gas-discharge tube dc breakdown voltage by state of insulation.Can reduce traditional gas-discharge tube dc breakdown voltage adopts photoelectric coupled device or resistance and photoelectric coupled device to be converted to the gas-discharge tube dc breakdown voltage measurement accuracy that the conducting state detection means brought and the technical matters of poor stability as its state of insulation.And can be converted to the characteristic difference of conducting state by state of insulation according to the gas-discharge tube of different electric pressures, designed little current differential sensor of different gears, accurately judge at a high speed, the duty of gas-discharge tube, realize the collecting unit of gas-discharge tube dc breakdown voltage measuring apparatus, the accurate dc breakdown voltage of measurement gas discharge tube, the measurement stability of gas-discharge tube dc breakdown voltage reaches ± and 1%.
Claims (6)
1. gas-discharge tube dc breakdown voltage measuring apparatus and method, it is characterized in that: comprise that the man-machine interaction parameter is provided with and measurement result display unit (1) and control and measuring unit (2) with the microcomputer that the setting of man-machine interaction parameter is connected with measurement result display unit (1), said microcomputer control comprises control module (2-1) and the measuring unit (2-2) that is connected with control module (2-1) with measuring unit (2), wherein control module (2-1) links to each other with adjustable climbing speed direct supply (3), the high-voltage output end of adjustable climbing speed direct supply (3) is connected with an end of current limliting unit (4), the other end of current limliting unit (4) is connected with an end of gas-discharge tube load (5), the other end of gas-discharge tube load (5) is connected with an end of the excitation telefault (8) of little current differential sensor (6), the other end of excitation telefault (8) is connected with the low pressure end of adjustable climbing speed direct supply (3), and measuring unit (2-2) is connected with the inductive coil (9) of little current differential sensor (6).
2. the measurement mechanism of gas-discharge tube dc breakdown voltage according to claim 1 is characterized in that: said little current differential sensor (6) by be wound on high magnetic permeability on annular or the rectangle, excitation telefault (8) and three to four the separate inductive coils (9) of electric mutual isolation on the high-frequency magnetic material are formed.
3. the measurement mechanism of gas-discharge tube dc breakdown voltage according to claim 1, it is characterized in that: choosing of said current limliting unit (4) is to guarantee under the condition of the DC voltage that applies adjustable climbing speed, and the current value by gas-discharge tube load (5) is not more than 1mA.
4. the measurement mechanism of gas-discharge tube dc breakdown voltage according to claim 1, it is characterized in that: the control of said microcomputer and the measuring unit (2-2) of measuring unit (2) comprise respectively be connected with control module (2-1) and the voltage divider (7) that is attempted by gas-discharge tube load (5) two ends peak holding circuit (11) and 12 or 16 the A/D Acquisition Circuit (12) that is connected with control module (2-1), and the inductive coil (9) of little current differential sensor (6) passes through d type flip flop (10) and links to each other with control module (2-1).
5. measuring method based on the described gas-discharge tube dc breakdown of claim 1 voltage measuring apparatus is characterized in that:
1) is provided with by the man-machine interaction parameter and the adjustable climbing speed of measurement result display unit (1) input DC power;
2) control module (2-1) of microcomputer control and measuring unit (2) receives the adjustable voltage climbing speed signal of the direct supply of man-machine interaction parameter setting and measurement result display unit (1) setting, output voltage by digital-to-analog D/A change-over circuit control direct current module, the requirement of gas-discharge tube load (5) dc breakdown voltage measurement is satisfied in the output of the high direct voltage signal of the voltage climbing speed that realization is set;
3) output voltage when adjustable climbing speed direct supply (3) makes gas-discharge tube load (5) when being converted to conducting state by state of insulation, produces a zooming voltage signal in the drive coil (8) of little current differential sensor (6)
u 8
4) this zooming voltage signal
u 8In the respective coil of the inductive coil (9) of little current differential sensor (6), induce the zooming voltage signal of high amplitude
u 9Voltage signal
u 9Control d type flip flop (10), d type flip flop (10) outputs to the control module (2-1) of control of control microcomputer and measuring unit (2), control module (2-1) stops the control of boosting to adjustable climbing speed direct supply (3) on the one hand, the peak sampling hold circuit (11) of control survey unit (2-2) work on the other hand will be applied to gas-discharge tube load (5) and keeps getting off through the magnitude of voltage of overvoltage sensor (7) conversion;
5) microcomputer control is carried out data acquisition with the A/D converter (12) of control module (2-1) the control survey unit (2-2) of measuring unit (2) to the voltage that is applied to gas-discharge tube load (5) two ends by voltage sensor (7) conversion;
6) measuring unit (2-2) of microcomputer control and measuring unit (2) digital signal that A/D converter (12) is obtained multiply by the scale factor of voltage sensor (7), obtain the dc breakdown voltage of gas-discharge tube load (5), and be presented on the liquid crystal display of setting of man-machine interaction parameter and measurement result display unit (1).
6. gas-discharge tube dc breakdown voltage measurement method according to claim 5 is characterized in that: the adjustable climbing speed of the direct supply of described step 1) is 100V/s, 200V/s, 500V/s or 1000V/s.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101991588A CN101846721B (en) | 2010-06-12 | 2010-06-12 | Measuring device for direct current breakdown voltage of gas discharge tube and method thereof |
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| CN2010101991588A CN101846721B (en) | 2010-06-12 | 2010-06-12 | Measuring device for direct current breakdown voltage of gas discharge tube and method thereof |
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| CN101846721A true CN101846721A (en) | 2010-09-29 |
| CN101846721B CN101846721B (en) | 2012-07-18 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103399263A (en) * | 2013-07-24 | 2013-11-20 | 西安交通大学 | System and method for comprehensively measuring direct current (DC) parameters of surge protection module |
| CN105004978A (en) * | 2015-08-10 | 2015-10-28 | 南京信息工程大学 | Multi-channel testing apparatus for direct-current breakdown voltage of switching type surge protection device |
| CN109061404A (en) * | 2018-06-25 | 2018-12-21 | 国网湖南省电力有限公司 | Internal clearance lightning arrester discharge pipe is along face ablation test device and test method |
| CN109270416A (en) * | 2018-08-27 | 2019-01-25 | 云南电网有限责任公司电力科学研究院 | Inflation line discharge test system and method under different rising edge steep wave overvoltage |
| CN112485625A (en) * | 2020-12-07 | 2021-03-12 | 江苏联群电子科技有限公司 | Gas discharge tube HV aging sorting circuit capable of effectively reducing energy loss |
Families Citing this family (1)
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| CN105137885A (en) * | 2015-09-17 | 2015-12-09 | 西安交通大学 | Control system and control method of multi-switch and multi-loop cooperative work |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103399263A (en) * | 2013-07-24 | 2013-11-20 | 西安交通大学 | System and method for comprehensively measuring direct current (DC) parameters of surge protection module |
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| CN105004978A (en) * | 2015-08-10 | 2015-10-28 | 南京信息工程大学 | Multi-channel testing apparatus for direct-current breakdown voltage of switching type surge protection device |
| CN105004978B (en) * | 2015-08-10 | 2017-09-26 | 南京信息工程大学 | Multi-channel switch type surge protector dc breakdown voltage test device |
| CN109061404A (en) * | 2018-06-25 | 2018-12-21 | 国网湖南省电力有限公司 | Internal clearance lightning arrester discharge pipe is along face ablation test device and test method |
| CN109061404B (en) * | 2018-06-25 | 2021-09-03 | 国网湖南省电力有限公司 | Method for testing surface ablation of discharge tube of inner gap lightning arrester |
| CN109270416A (en) * | 2018-08-27 | 2019-01-25 | 云南电网有限责任公司电力科学研究院 | Inflation line discharge test system and method under different rising edge steep wave overvoltage |
| CN109270416B (en) * | 2018-08-27 | 2021-01-26 | 云南电网有限责任公司电力科学研究院 | Inflation line discharge test system and method under different rising edge steep wave overvoltage |
| CN112485625A (en) * | 2020-12-07 | 2021-03-12 | 江苏联群电子科技有限公司 | Gas discharge tube HV aging sorting circuit capable of effectively reducing energy loss |
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| CN101846721B (en) | 2012-07-18 |
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