NL2026660B1 - High-precision Measuring Device for Pre-breakdown Current of Vacuum Chamber and Measuring Method - Google Patents

High-precision Measuring Device for Pre-breakdown Current of Vacuum Chamber and Measuring Method Download PDF

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NL2026660B1
NL2026660B1 NL2026660A NL2026660A NL2026660B1 NL 2026660 B1 NL2026660 B1 NL 2026660B1 NL 2026660 A NL2026660 A NL 2026660A NL 2026660 A NL2026660 A NL 2026660A NL 2026660 B1 NL2026660 B1 NL 2026660B1
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resistor
voltage
vacuum chamber
discharge tube
gas discharge
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NL2026660A
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Dutch (nl)
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NL2026660A (en
Inventor
Li Shimin
Wu Fangfang
Zhang Chaohai
Du Zhaoqi
Yang Wei
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Zhejiang Huadian Equipment Testing Inst Co Ltd
Univ Nanjing Aeronautics & Astronautics
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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
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1254—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of gas-insulated power appliances or vacuum gaps
    • 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
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
    • 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
    • G01R31/333—Testing of the switching capacity of high-voltage circuit-breakers ; Testing of breaking capacity or related variables, e.g. post arc current or transient recovery voltage
    • G01R31/3333—Apparatus, systems or circuits therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/36—Overload-protection arrangements or circuits for electric measuring instruments
    • 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
    • G01R31/3272—Apparatus, systems or circuits therefor
    • G01R31/3274—Details related to measuring, e.g. sensing, displaying or computing; Measuring of variables related to the contact pieces, e.g. wear, position or resistance

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

Disclosed are a high-precision measuring device for a pre-breakdown current of a vacuum chamber and a measuring method. The device comprises a voltage source 1, a transformer 2, a voltage divider, a control switch 4 and a transient voltage suppression diode 10, wherein the transient voltage suppression diode 10 is connected in parallel with a gas discharge tube 11, the 5 gas discharge tube is connected in parallel with a resistor 12, and the resistor is connected in parallel with an oscilloscope 13. One end of the resistor 12 is connected in series with a vacuum chamber 9, and the other end of the resistor is grounded. The transient voltage suppression diode and the gas discharge tube are matched to measure pre-breakdown currents of multiple voltage waveforms, and a purpose of high-precision measurement can be achieved according to working 10 characteristics of the transient voltage suppression diode and the gas discharge tube. 1

Description

Title: High-precision Measuring Device for Pre-breakdown Current of Vacuum Chamber and Measuring Method Technical Field The present invention belongs to the field of vacuum chamber technologies, and more particularly, relates to a high-precision measuring device for a pre-breakdown current of a vacuum chamber and a measuring method . Background Art An existing vacuum circuit breaker, such as "a vacuum circuit breaker with a zero sequence device" disclosed in the Chinese document CN201520032013.7, has a pre-breakdown current which is generated by breakdown during closing of the vacuum circuit breaker, and a key factor for success or failure of a synthetic closing test of the vacuum circuit breaker lies in precise measurement of the pre-breakdown current.
Since the pre-breakdown current generated by the vacuum circuit breaker has a very short action time, there is a very high technical requirement on detection of the pre-breakdown current. At present, there are few pre-breakdown current detection devices applied to the vacuum circuit breaker in China, which are generally limited to an experimental research scope and are only used in scientific research. Moreover, testing equipment has a poor stability, is only suitable for a single voltage waveform, and has a low detection precision.
For example, “a test system for detecting a field-emission current between contacts of an chamber" disclosed in the Chinese document CN201910398158.1 proposes the test system for detecting the field-emission current between the contacts, which is used for detecting the field-emission current between the contacts of the chamber, thus precisely measuring the field-emission current between the contacts of the chamber. A defect of the technical solution lies in that: the field-emission current cannot be measured by experimental means in a breakdown test of the chamber. It is a feasible solution to obtain the field-emission current by the measured pre-breakdown current and a related mathematical algorithm.
Summary of the Invention In view of the technical problems in the background art, according to a high-precision measuring device for a pre-breakdown current of a vacuum chamber and a measuring method provided by the present invention, a transient voltage suppression diode and a gas discharge tube are matched to measure pre-breakdown currents of multiple voltage waveforms, and high-precision measurement can be realized according to working characteristics of the transient voltage suppression diode and the gas discharge tube.
The following technical solutions are used in the present invention to solve the above technical problems.
A high-precision measuring device for a pre-breakdown current of a vacuum chamber comprises a voltage source, a transformer, a voltage divider, a control switch and a transient voltage suppression diode, wherein the transient voltage suppression diode is connected in parallel with a gas discharge tube, and the gas discharge tube is connected in parallel with a resistor; and one end of the resistor is connected in series with a vacuum chamber, and the other end of the resistor is grounded.
In a preferred solution, the resistor is connected in series with the vacuum chamber and then connected in parallel with the voltage divider.
In a preferred solution, the voltage divider comprises a second resistor, a third resistor, a first capacitor and a second capacitor, and a parallel circuit formed by the second resistor and the first capacitor is arranged in series with a parallel circuit formed by the third resistor and the second capacitor.
In a preferred solution, the control switch is connected in series with a first resistor, and the first resistor, the control switch and the voltage divider form a closed loop circuit with an output end of the transformer.
In a preferred solution, the transformer is a boosting transformer, and the transformer is used for boosting a voltage of the voltage source.
In a preferred solution, the resistor is used for being connected in parallel with an oscilloscope.
In a preferred solution, the resistor is an inductive resistor or a non-inductive resistor.
The patent may achieve the following beneficial effects.
1. “Atest system for detecting a field-emission current between contacts of an chamber” disclosed in the Chinese document CN201910398158.1 proposes the test system for detecting the field-emission current between the contacts, which is used for detecting the field-emission current between the contacts of the chamber, thus precisely measuring the field-emission current between the contacts of the chamber. However, the field-emission current cannot be measured by experimental means in a breakdown test of the chamber (as shown in Fig. 2). Only the pre-breakdown current can be measured, and then the field-emission current is obtained by a related mathematical algorithm. Therefore, a high-precision measuring device for a pre-breakdown current of a vacuum chamber suitable for multiple voltage waveforms proposed in the patent is more precise and more practical.
2. “Atest system for detecting a field-emission current between contacts of an chamber”
disclosed in the Chinese document CN201910398158.1 proposes a measuring method in which a transient voltage suppression diode is used to suppress an overvoltage generated during breakdown of the vacuum chamber, but the transient voltage suppression diode is suitable for a voltage rising edge of an ns level. The voltage rising edge also has us and ns levels according to different power supplies used in a breakdown test of the vacuum chamber, resulting in different voltage rising edges. Therefore, the TVS (i.e., transient voltage suppression diode) cannot cope with a condition of the us level. Therefore, a parallel connection circuit of the transient voltage suppression diode (TVS) and the gas discharge tube is used in the present invention, which is characterized in that according to working characteristics of the transient voltage suppression diode (TVS) and the gas discharge tube, the transient voltage suppression diode acts quickly on a nanosecond voltage rising edge, with a quick voltage stabilization speed, while the gas discharge tube is suitable for a ps-level voltage rising edge, and copes with voltage stabilization of multiple voltage waveforms well.
3. A non-inductive resistor is used when a current is measured by “a test system for detecting a field-emission current between contacts of an chamber” disclosed in the Chinese document CN201910398158.1. Since only the transient voltage suppression diode (TVS) is used in the patent Test Svstem for Detecting Field-emission Current between Contacts of Arc-extinguishing Chamber, only the non-inductive resistor can be used. In the high-precision measuring device for the pre-breakdown current of the vacuum chamber and the measuring method of the patent, the patent is not limited to use of the non-inductive resistor, and the TVS combined with the gas discharge tube may be matched with any form of resistor to meet a requirement of a high measuring precision.
4. In addition, the summary of the invention proposed by "a direct current circuit breaker and a disconnection method of a direct current transmission system” disclosed in the Chinese patent document CN201610969117 X proposes that a control system, a protective branch, a parallel through-flow circuit and a LC forced transfer circuit are used to control the on-off of a high-voltage direct-current power transmission system, and a power electronic circuit is used to control a high current and a high voltage of the high-voltage direct-current power transmission system, while the patent proposes that the high-precision measuring device for the pre-breakdown current of the vacuum chamber suitable for multiple voltage waveforms precisely measures a pre-breakdown current of a loop circuit when the vacuum chamber 1s opened through cooperation of the transient voltage suppression diode (TVS) and the gas discharge tube. The patent plays a role of precisely measuring the pre-breakdown current of the loop circuit of the chamber, which is different from Direct Current Circuit Breaker and
Disconnection Method of Direct Current Transmission System.
5. A technical problem to be solved by "a test circuit and device for improving and evaluating a performance of a vacuum circuit breaker” disclosed in the Chinese patent document CN201811466131.3 lies in overcoming a problem that the performance of the circuit breaker cannot be quantitatively detected in the prior art, thus proposing a test circuit and device for simply and economically detecting improvement of the performance of the circuit breaker and evaluating the performance of the vacuum circuit breaker. A peak value of a closing inrush current can be increased or decreased and a pre-breakdown time can be prolonged or shortened by closing a sophisticated test circuit, so that the device achieves the best sophistication effect, while the patent is intended to precisely measure the pre-breakdown current of the loop circuit of the vacuum chamber, thus being different in the summary of the invention. Detailed Description of the Preferred Embodiments The present invention is further described hereinafter with reference to the accompanying drawings and the embodiments: Fig. 1 is a diagram of current measurement of the present invention; and Fig. 2 is a graph of a changing curve between a voltage and a breakdown current as well as a time in the prior art.
In the drawings: 1 refers to voltage source, 2 refers to transformer, 3 refers to first resistor, 4 refers to control switch, 5 refers to second resistor, 6 refers to third resistor, 7 refers to first capacitor, 8 refers to second capacitor, 9 refers to vacuum chamber, 10 refers to transient voltage suppression diode, 11 refers to gas discharge tube, 12 refers to resistor, and 13 refers to oscilloscope.
Detailed Description of the Preferred Embodiments A preferred solution is as shown in Fig. 1, a high-precision measuring device for a pre-breakdown current of a vacuum chamber comprises a voltage source 1, a transformer 2, a voltage divider, a control switch 4 and a transient voltage suppression diode 10. The transient voltage suppression diode 10 1s connected in parallel with a gas discharge tube 11, and the gas discharge tube 11 is connected in parallel with a resistor 12. One end of the resistor 12 is connected in series with a vacuum chamber 9, and the other end of the resistor 12 is grounded.
The control switch 4 is used for controlling the on-off of a whole measuring loop circuit. Contacts of a vacuum chamber 9 of a tested object are separated during detection, with a fixed clearance between open contacts, and a specific clearance is determined by specific experimental conditions.
Further, the resistor 12 is connected in series with the vacuum chamber 9 and then connected in parallel with the voltage divider.
Further, the voltage divider comprises a second resistor 5, a third resistor 6, a first capacitor 7 and a second capacitor 8, and a parallel circuit formed by the second resistor 5 and the first capacitor 7 is arranged in series with a parallel circuit formed by the third resistor 6 and the 5 second capacitor 8.
Further, the control switch 4 is connected in series with a first resistor 3, and the first resistor 3, the control switch 4 and the voltage divider form a closed loop circuit with an output end of the transformer 2. The first resistor 3 is used for limiting a current and protecting a whole circuit.
Further, the transformer 2 is a boosting transformer, and the transformer 2 is used for boosting a voltage of the voltage source 1. The transformer 2 may change a voltage inputted into the whole loop circuit, and a voltage of a power frequency voltage source is not high enough, so that the transformer 2 can increase the voltage of the voltage source 1.
Further, the resistor 12 is used for being connected in parallel with an oscilloscope 13.
Further, the resistor 12 is an inductive resistor or a non-inductive resistor.
In a preferred solution, a measuring method of the high-precision measuring device for the pre-breakdown current of the vacuum chamber comprises the following steps: S1: connecting the oscilloscope 13 in parallel with the resistor 12, connecting the resistor 12 in series with the vacuum chamber 9 to be measured, and selectively triggering the transient voltage suppression diode 10 or the gas discharge tube 11 by different voltage waveforms in experiments, acting quickly, by the transient voltage suppression diode 10, on a nanosecond voltage rising edge, with a quick voltage stabilization speed; and stabilizing, by the gas discharge tube 11, voltages of multiple waveforms for a microsecond voltage rising edge; S2: during pre-breakdown of the vacuum chamber 9, gas in the gas discharge tube 11 having a good insulation performance, a current flowing through the resistor 12 being low, which is generally a microampere level, and voltages at both ends of the resistor 12 being low; S3: during breakdown of the vacuum chamber 9, increasing the current flowing through the resistor 12 sharply, which generally reaches several amperes, then acting by the transient voltage suppression diode 10 or the gas discharge tube 11, and stabilizing the voltages at both ends of the resistor 12 at a working voltage of the transient voltage suppression diode 10 or the gas discharge tube 11, thus protecting the oscilloscope 13; and S4: a calculation formula of a pre-breakdown current being: [= Uz Ry,
wherein a resistance Riz is a resistance value of the measuring resistor 12; Uriz is voltage values at both ends of the measuring resistor 12, the voltage values are lower than lowest protection working voltages of the gas discharge tube and the transient voltage suppression diode; and is a pre-breakdown current in a loop circuit, which is namely a pre-breakdown current value in the loop circuit corresponding to a moment of the voltages Uriz at both ends of the measuring resistor.
A high measuring precision is a main advantage of the present invention, for example, a working voltage of the transient voltage suppression diode is selected to be 15 V, a maximum leakage current value before breakdown of the TVS is 1 pA, and a current flowing through Rs is
7.5 mA under 15 V. Lud i” Precision calculation is 7 5 mA A sx10 <1 ‚ and high-precision measurement of the device is realized by an expression.
During the above measuring process, assuming that a resistance of the second resistor 5 is RO, a resistance of the third resistor 6 is R1, and a voltage of the third resistor 6 is U2, a voltage of the whole loop circuit is calculated by a formula U=U2/R1 * (R0+R1). The voltage of the loop circuit is a voltage applied to the chamber, and measured as a measured quantity of a system, which is convenient for later calculation and use.

Claims (9)

ConclusiesConclusions 1. Een zeer nauwkeurig meetapparaat voor een pre-doorslagstroom van een vacuümkamer, omvattende een spanningsbron (1), een transformator (2), een spanningsdeler, een regelschakelaar (4) en een transiënte spanningsonderdrukkingsdiode (10), waarbij de transiénte spanningsonderdrukkingsdiode (10) parallel is verbonden met een gasontladingsbuis (11), en de gasontladingsbuis (11) parallel is verbonden met een weerstand (12); en een uiteinde van de weerstand (12) in serie is verbonden met een vacuümkamer (9), en het andere uiteinde van de weerstand (12) geaard is.A high-precision vacuum chamber pre-breakdown current measuring apparatus comprising a voltage source (1), a transformer (2), a voltage divider, a control switch (4) and a transient voltage suppression diode (10), wherein the transient voltage suppression diode (10 ) is connected in parallel with a gas discharge tube (11), and the gas discharge tube (11) is connected in parallel with a resistor (12); and one end of the resistor (12) is connected in series with a vacuum chamber (9), and the other end of the resistor (12) is grounded. 2. Het zeer nauwkeurige meetapparaat voor de pre-doorslagstroom van de vacuümkamer volgens conclusie 1, waarbij de weerstand (12) in serie is geschakeld met de vacuümkamer (9) en dan parallel is opgesteld met de spanningsdeler.The high-precision vacuum chamber pre-breakdown current measuring apparatus according to claim 1, wherein the resistor (12) is connected in series with the vacuum chamber (9) and then arranged in parallel with the voltage divider. 3. Het zeer nauwkeurige meetapparaat voor de pre-doorslagstroom van de vacuümkamer volgens conclusie 1 of 2, waarbij de spanningsdeler een tweede weerstand (5), een derde weerstand (6), een eerste condensator (7) en een tweede condensator (8) omvat, en een parallelschakeling gevormd door de tweede weerstand (5) en de eerste condensator (7) in serie is opgesteld met een parallel circuit gevormd door de derde weerstand (6) en de tweede condensator (8).The high-precision vacuum chamber pre-breakdown current measuring apparatus according to claim 1 or 2, wherein the voltage divider comprises a second resistor (5), a third resistor (6), a first capacitor (7) and a second capacitor (8) and a parallel circuit formed by the second resistor (5) and the first capacitor (7) is arranged in series with a parallel circuit formed by the third resistor (6) and the second capacitor (8). 4. Het zeer nauwkeurige meetapparaat voor de pre-doorslagstroom van de vacuümkamer volgens conclusie 3, waarbij de regelschakelaar (4) in serie is verbonden met een eerste weerstand (3), en de eerste weerstand (3), de regelschakelaar (4) en de spanningsdeler een circuit met gesloten lus vormen met een uitgangseinde van de transformator (2).The high-precision vacuum chamber pre-breakdown current measuring apparatus according to claim 3, wherein the control switch (4) is connected in series with a first resistor (3), and the first resistor (3), the control switch (4) and the voltage divider form a closed loop circuit with an output end of the transformer (2). 5. Het zeer nauwkeurige meetapparaat voor de pre-doorslagstroom van de vacuümkamer volgens conclusie 4, waarbij de transformator (2) een boosttransformator is en de transformator (2) gebruikt wordt voor het versterken van een spanning van de spanningsbron (1).The high-precision vacuum chamber pre-breakdown current measuring apparatus according to claim 4, wherein the transformer (2) is a boost transformer and the transformer (2) is used to amplify a voltage of the voltage source (1). 6. Het zeer nauwkeurige meetapparaat voor de pre-doorslagstroom van de vacuümkamer volgens conclusie 1, waarbij de weerstand (12) wordt gebruikt om parallel te worden geschakeld met een oscilloscoop.The high-precision vacuum chamber pre-breakdown current measuring apparatus according to claim 1, wherein the resistor (12) is used to be connected in parallel with an oscilloscope. 7. Het zeer nauwkeurige meetapparaat voor de pre-doorslagstroom van de vacuümkamer volgens conclusie 1, 2, 4, 5 of 6, waarbij de weerstand (12) een inductieve weerstand of een niet- inductieve weerstand is.The high-precision vacuum chamber pre-breakdown current measuring apparatus according to claim 1, 2, 4, 5 or 6, wherein the resistor (12) is an inductive resistor or a non-inductive resistor. 8. Een meetmethode voor het zeer nauwkeurige meetapparaat voor de pre-doorslagstroom van de vacuümkamer volgens een van de conclusies 1 tot 7, die de volgende stappen omvat:A measuring method for the high-precision vacuum chamber pre-breakdown current measuring apparatus according to any one of claims 1 to 7, comprising the steps of: S1: de oscilloscoop parallel verbinden met de weerstand (12), de weerstand (12) in serie verbinden met de te meten vacuümkamer (9) en selectief de transiénte spanningsonderdrukkingsdiode (10) of de gasontladingsbuis ( 11) activeren door verschillende spanningsgolfvormen in experimenten; snel handelen, door de transiënte spanningsonderdrukkingsdiode (10), op een nanoseconde spanningstijgende flank, een beschermende rol spelen op een nanoseconde overspanning, en de nanoseconde overspanning onderdrukken; en gevoelig reageren, door de gasontladingsbuis (ll), op een nanoseconde spanningsstijgende flank, een beschermende rol spelen op microseconde overspanningen van meerdere golfvormen, en de microseconde overspanningen onderdrukken, waardoor de geteste oscilloscoop (13) verder wordt beschermd;S1: connecting the oscilloscope in parallel with the resistor (12), connecting the resistor (12) in series with the vacuum chamber (9) to be measured and selectively activating the transient voltage suppression diode (10) or the gas discharge tube (11) by different voltage waveforms in experiments; act quickly, by the transient voltage suppression diode (10), on a nanosecond voltage rising edge, play a protective role on a nanosecond overvoltage, and suppress the nanosecond overvoltage; and reacting sensitively, by the gas discharge tube (11), to a nanosecond voltage-rising edge, playing a protective role on microsecond overvoltages of multiple waveforms, and suppressing the microsecond overvoltages, further protecting the tested oscilloscope (13); S2: tijdens de pre-doorslag van de vacuümkamer (9), gas in de gasontladingsbuis (11) met goede isolatieprestaties, een stroom die door de weerstand (12) vloeit laag is, en spanningen aan beide uiteinden van de weerstand ( 12) laag zijn;S2: During the pre-breakdown of the vacuum chamber (9), gas in the gas discharge tube (11) with good insulation performance, a current flowing through the resistor (12) is low, and voltages at both ends of the resistor (12) are low are; S3: tijdens het uitvallen van de vacuümkamer (9), waarbij de stroom die door de weerstand (12) vloeit sterk wordt verhoogd, vervolgens wordt ingewerkt door de transiënte spanningsonderdrukkingsdiode (10) of de gasontladingsbuis (11) en de spanningen op beide uiteinden van de weerstand (12) te stabiliseren op een werkspanning van de transiënte spanningsonderdrukkingsdiode (10) of de gasontladingsbuis (11), waardoor de oscilloscoop wordt beschermd; enS3: during the failure of the vacuum chamber (9), where the current flowing through the resistor (12) is greatly increased, then acted by the transient voltage suppression diode (10) or the gas discharge tube (11) and the voltages at both ends of stabilizing the resistor (12) at an operating voltage of the transient voltage suppression diode (10) or the gas discharge tube (11), thereby protecting the oscilloscope; and S4: een berekeningsformule van een pre-doorslagstroom is:S4: A calculation formula of a pre-breakdown current is: ‚Ue Ry;Ue Ry; waarbij een weerstand Ry, een weerstandswaarde is van de meetweerstand (12);wherein a resistance Ry 1 is a resistance value of the measurement resistor (12); Um2 spanningswaarden zijn aan beide uiteinden van de meetweerstand (12), de spanningswaarden lager zijn dan de laagste beschermingswerkspanningen van de gasontladingsbuis en de transiënte spanningsonderdrukkingsdiode; enUm2 voltage values are at both ends of the measurement resistor (12), the voltage values are lower than the lowest working protection voltages of the gas discharge tube and the transient voltage suppression diode; and I een pre-doorslagstroom is in een luscircuit, wat namelijk een pre-doorslagstroomwaarde in het luscircuit is die overeenkomt met een moment van de spanningen Ug12 aan beide uiteinden van de meetweerstand.I is a pre-breakdown current in a loop circuit, namely a pre-breakdown current value in the loop circuit corresponding to a moment of the voltages Ug12 at both ends of the measuring resistor. 9. De meetmethode van het zeer nauwkeurige meetapparaat voor de pre-doorslagstroom van de vacuümkamer volgens conclusie 8, waarbij: tijdens het meetproces, aangenomen dat een weerstand van de tweede weerstand (5) RO is, een weerstand van de derde weerstand (6) R1 is, en een spanning van de derde weerstand (6) U2 is, een spanning van het hele circuit wordt berekend met de formule U = U2/R1 * (RO+R1); en de spanning van het luscircuit een spanning is die op de kamer wordt toegepast en gemeten wordt als een gemeten grootheid van een systeem, wat handig is voor latere berekening en gebruik.The measuring method of the high-precision vacuum chamber pre-breakdown current measuring apparatus according to claim 8, wherein: during the measuring process, assuming a resistance of the second resistor (5) is RO, a resistance of the third resistor (6) R1, and a voltage of the third resistor (6) is U2, a voltage of the whole circuit is calculated by the formula U = U2/R1 * (RO+R1); and the loop circuit voltage is a voltage applied to the chamber and measured as a measured quantity of a system, which is convenient for later calculation and use.
NL2026660A 2020-10-12 2020-10-12 High-precision Measuring Device for Pre-breakdown Current of Vacuum Chamber and Measuring Method NL2026660B1 (en)

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CN100508323C (en) * 2005-12-12 2009-07-01 深圳市科陆电源技术有限公司 Signal lightning protection circuit
US10243358B2 (en) * 2013-12-18 2019-03-26 Telefonaktiebolaget Lm Ericsson (Publ) Surge protection device and telecommunication equipment comprising the same
CN206208962U (en) * 2016-11-25 2017-05-31 云南电网有限责任公司电力科学研究院 A kind of differential configuration resitstance voltage divider
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CN110058135A (en) * 2019-05-14 2019-07-26 云南电网有限责任公司电力科学研究院 Autoelectronic current detects pilot system between a kind of arc-chutes contact

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