CN105866603B - A kind of method and device measuring electric arc thermal energy using cross electromagnetic wave small room - Google Patents
A kind of method and device measuring electric arc thermal energy using cross electromagnetic wave small room Download PDFInfo
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- CN105866603B CN105866603B CN201610453503.3A CN201610453503A CN105866603B CN 105866603 B CN105866603 B CN 105866603B CN 201610453503 A CN201610453503 A CN 201610453503A CN 105866603 B CN105866603 B CN 105866603B
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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
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Abstract
The present invention relates to a kind of method and devices measuring electric arc thermal energy using cross electromagnetic wave small room, measure the voltage and current information of gas discharge arc, utilize the measurement result of electric arc gross energy, it is combined the electromagnetic radiation energy that the electric arc that the measurement of the cells TEM obtains generates, then obtains the concrete numerical value of electric arc thermal energy by calculating.This method comprises the steps of：(1) voltage and current information of gaseous arc are measured；(2) gross energy for obtaining electric arc integrates the product of voltage and electric current using mathematical method on a timeline；(3) cells transverse electro-magnetic wave TEM is utilized to measure the electromagnetic radiation energy of electric arc；(4) electromagnetic radiation energy that the gross energy of electric arc is subtracted to electric arc obtains the thermal energy of electric arc.The present invention has the advantages of safe and reliable, operation is flexible, measures electric arc thermal energy indirectly.
Description
Technical field
The present invention relates to a kind of method and devices measuring electric arc thermal energy, more particularly to by surveying indirectly in forceful electric power magnetic environment
The method for measuring electric arc thermal energy, belongs to technical field of electromagnetic compatibility measurement.
Background technology
To a certain extent, gas molecule will be ionized electric-field strength in air, form plasma, and generate of short duration put
Electric current makes charge be consumed or neutralize, and sends out light and heat, and generate sound.Spark discharge general persistence is very short, required
The electric field strength reached is very high, and such field strength is generally present between the tip of two conductive metal bodies, thus is otherwise known as
Point discharge.
Strong-electromagnetic field environment can make to generate certain potential difference between different metallic conductor tips, when potential difference is sufficiently large
And when the electric field in air being made to reach the field strength needed for point discharge, the spark of arc discharge can be formed.Discharge the electric arc generated
(spark) has apparent voltage and current characteristics, and can release light and heat.
Discharge spark is very short in the discharge current duration that electrode both ends generate, and spectral characteristic has very strong high frequency
Component, thus spark can externally generate certain electromagnetic radiation；The igniting of the mixed gas of fuel gas or air fuel gas is by heat
Caused by effect, the thermal energy that discharge spark generates can be such that fuel gas lights, when fuel gas is located at a closed cavity
When interior, the danger also exploded.
Currently, common method is directly to test, the state by observing fuel tank determines the conclusion of experiment.This method is not required to
Other test devices are wanted, it is convenient to carry out.
However, the shortcomings that direct method of testing is difficult to overcome there is also some：First, direct method of testing is more dangerous, place
It is not easy danger that is controlled, or even having explosion after the fuel-steam of confined space is ignited；Direct method of testing is only capable of being determined
Property analysis, test result is only effective to experimental condition, while can not obtain the relevant information of electromagnetic radiation energy, thus can not
Quantized data is obtained, so the result under other experimental conditions can not be assessed by test data.
Invention content
The purpose of the present invention is overcoming the shortcomings of existing method and technology, provide a kind of electric using cross electromagnetic wave small room measurement
The method and device of arc thermal energy has the advantages of safe and reliable, operation is flexible, can measure electric arc thermal energy indirectly.
To achieve the goals above, the present invention proposes a kind of measuring electric arc thermal energy using transverse electro-magnetic wave (TEM) cell
Method is combined the electromagnetic radiation energy that the electric arc that the measurement of the cells TEM obtains generates using the measurement result of electric arc gross energy
Amount, then the concrete numerical value by calculating acquisition electric arc thermal energy.This method comprises the steps of：
The gross energy of electric arc is calculated according to the voltage and current information that measure obtained electric arc；
The electromagnetic radiation energy of electric arc is measured using the cells TEM；
The electromagnetic radiation energy that the gross energy of electric arc is subtracted to electric arc obtains the thermal energy of electric arc.
The gross energy that gas discharge generates can be divided into two large divisions, and a part is the light and heat production released due to electric arc
Raw thermal energy, another part are the electromagnetic radiation energies generated due to the discharge current of electric arc.Therefore by measuring the electricity obtained
The gross energy and electromagnetic radiation energy of arc can obtain the thermal energy E of electric arc indirectly by following formulah：Eh=E-Ee。
The cells TEM are a closed TEM waves transmission structures for being similar to coaxial line, are usually used in electromagnetic compatibility (EMC) and electricity
Magnetic disturbance (EMI) is tested, and has the characteristics that field strength distribution is uniform and controllable.Since the cells TEM are closed electromagnetic transmission knots
Structure, therefore the thermal energy of the electric arc generated between electrode will not be detected, and can only pass through the Port detecting at cell both ends to electric arc
Electromagnetic radiation energy Ee.The a port termination matching of the cells TEM is loaded, another port is connect with oscillograph, then showing
Wave device will receive the electromagnetic radiation energy of electric arc half.Electric arc can be calculated in the voltage value obtained by oscilloscope measurement
Electromagnetic radiation energyIn formula, UeIt is the rms voltage that oscilloscope measurement obtains, R0It is that termination matching is negative
The size of load.
After gas is accumulated in the charge breakdown of two end electrodes, the electric arc of generation has apparent voltage and current characteristics,
The voltage and current curve of electric arc can be observed and measured by oscillograph.The data record of measurement is got off, by mathematics side
The electric discharge gross energy of electric arc can be accurately calculated in method.The electric discharge gross energy calculation formula of electric arc：
In formula：E is the gross energy that arc discharge generates, and U is the voltage between two ends of electric arc, and I is the electric current of electric arc, t0It is electric arc
The initial time of generation, t1It is the finish time of arc extinction.
The present invention proposes the method for measuring electric arc thermal energy indirectly using the cells TEM, is directly measured and is obtained by oscillograph
The specific number of electric arc thermal energy is calculated in conjunction with the electromagnetic radiation energy for the electric arc that the measurement of the cells TEM obtains in the gross energy of electric arc
Value.
The a kind of of the present invention measures electric arc heat energy apparatus using cross electromagnetic wave small room, including：The cells TEM, discharge electrode, 50
Various cables and power supply that Ω matched loads, an oscillograph are worked normally with holding equipment etc.；During experiment, by electric discharge electricity
Pole is placed in the cells TEM, and energy is provided to two discharge electrodes by power supply.The a-road-through of oscillograph crosses high-voltage probe and two
The end of a electrode is connected, the voltage curve for electric arc during measuring gas discharge；Another way is added in electricity by current probe
On the circuit that source is formed with electrode, the current curve for measuring electric arc；The matching that one end connection size of the cells TEM is 50 Ω
Load, the other end are then connected with oscillograph, and the electromagnetic field of high frequency radiation energy dimidiation that such electrode discharge generates is small by TEM
The both ends of room receive, and the radiation energy numerical value of electric arc is calculated in the voltage swing that can be obtained by oscilloscope measurement.Most
Afterwards, in conjunction with obtained electric arc gross energy and radiation energy is measured, formula can be substituted into：Eh=E-EeIn electric arc thermal energy is calculated
Concrete numerical value.
The present invention has following evident characteristic：
(1) a kind of method measuring electric arc thermal energy by cross electromagnetic wave small room of the present invention is fitted in the way of measuring indirectly
Thermal energy for measuring gas discharge arc under various experimental conditions, safety convenient using setting；
(2) a kind of aim parameter that the method measuring electric arc thermal energy using cross electromagnetic wave small room measures of the present invention is the spoke of electric arc
Energy is penetrated, using closed electromagnetic transmission structure --- the cells TEM, electromagnetic radiation No leakage, test result accuracy are high；
(3) present invention is a kind of measuring the method for electric arc thermal energy with the energy values relationship work of electric arc using cross electromagnetic wave small room
For calculation basis, test data can quantify to record and judge.
Description of the drawings
Fig. 1 is a kind of flow chart for the method measuring electric arc thermal energy using cross electromagnetic wave small room of the present invention；
Fig. 2 is shown using a kind of embodiment flow of method measuring electric arc thermal energy using cross electromagnetic wave small room of the present invention
It is intended to；
Fig. 3 is a kind of arrangement schematic diagram measuring electric arc heat energy apparatus using cross electromagnetic wave small room of the present invention.
Specific implementation mode
The following describes the present invention in detail with reference to the accompanying drawings and embodiments.
As shown in Figure 1, the gross energy that gas discharge generates can be divided into two large divisions, a part is since electric arc releases
Light and heat generate thermal energy, another part be due to electric arc discharge current generate electromagnetic radiation energy.Therefore it is terrible
To the concrete numerical value of electric arc thermal energy, it is necessary to obtain the gross energy and electromagnetic radiation energy of electric arc by measurement.
The gross energy of electric arc can be obtained by oscilloscope measurement.Gas discharge generate electric arc have apparent voltage with
Current characteristics can measure the voltage curve of electric arc during electric discharge using the high-voltage probe of oscillograph, can be with using current probe
The current curve during electric discharge is measured, the curve storage of measurement is recorded, then by energy on circuit and voltage and current
Relationship, the electric discharge gross energy of electric arc can accurately be calculated.The electric discharge gross energy calculation formula of electric arc：The radiation energy of electric arc can be obtained by the measurement of the cells TEM.Pass through the end of the cells oscilloscope measurement TEM one
The rms voltage of mouth, can be calculated the electromagnetic radiation energy of electric arcFinally, it is obtained in conjunction with measurement
Electric arc gross energy and radiation energy, formula can be substituted into：Eh=E-EeIn the concrete numerical value of electric arc thermal energy is calculated.
As shown in Fig. 2, experiment during mounting arrangements as shown in Figure 3 first for detection instrument and equipment, then according to
Testing procedure is tested, and the electromagnetic field signal of electric arc in discharge process is obtained and record, the voltage finally obtained according to test
With current data, substitutes into respective formula and calculate, the test result tested.
As shown in figure 3, experimental rig include mainly the cells TEM, discharge electrode, 50 Ω matched loads, oscillograph with
Various cables and power supply of holding equipment normal work etc..During experiment, discharge electrode is placed in the cells TEM, is passed through
Power supply provides energy to two discharge electrodes.The a-road-through of oscillograph crosses high-voltage probe and is connected with the end of two electrodes, is used for
The voltage curve of electric arc during measurement gas discharge；Another way is added in by current probe on the circuit that power supply is formed with electrode,
Current curve for measuring electric arc；The cells TEM one end connection size be 50 Ω matched load, the other end then with oscillograph
It is connected, the electromagnetic field of high frequency radiation energy dimidiation that such electrode discharge generates is received by the both ends of the cells TEM, can be led to
The voltage swing that oscilloscope measurement obtains is crossed, the radiation energy numerical value of electric arc is calculated.
Above example is provided just for the sake of the description purpose of the present invention, and is not intended to limit the scope of the present invention.This
The range of invention is defined by the following claims.It does not depart from spirit and principles of the present invention and the various equivalent replacements made and repaiies
Change, should all cover within the scope of the present invention.
Claims (3)
1. a kind of method measuring electric arc thermal energy using cross electromagnetic wave small room, it is characterised in that include the following steps：
(1) voltage and current information of gaseous arc are measured；
(2) gross energy for obtaining electric arc integrates the product of voltage and electric current using mathematical method on a timeline；
(3) cells transverse electro-magnetic wave TEM is utilized to measure the electromagnetic radiation energy of electric arc；
(4) electromagnetic radiation energy that the gross energy of electric arc is subtracted to electric arc obtains the thermal energy of electric arc；
In the step (3), the process that the electromagnetic radiation energy of electric arc is measured using the cells transverse electro-magnetic wave TEM is as follows：TEM is small
The a port termination matching of room loads, another port is connect with oscillograph, and oscillograph will receive the electricity of electric arc half
The electromagnetic radiation energy of electric arc can be calculated in magnetic radiation energy, the voltage value obtained by oscilloscope measurement
In formula, UeIt is the rms voltage that oscilloscope measurement obtains, R0It is the size of termination matching load.
2. the method according to claim 1 for measuring electric arc thermal energy using cross electromagnetic wave small room, it is characterised in that：The step
Suddenly in (2), the gross energy calculation formula of electric arc：In formula：E is the gross energy that arc discharge generates, and U is electricity
Voltage between two ends of arc, I are the electric current of electric arc, t0It is the initial time that electric arc generates, t1At the end of being arc extinction
It carves.
3. a kind of measuring electric arc heat energy apparatus using cross electromagnetic wave small room, it is characterised in that including：The cells TEM, discharge electrode, 50
The various cables and power supply of Ω matched loads, an oscillograph and holding equipment normal work；During experiment, by discharge electrode
It is placed in the cells TEM, energy is provided to two discharge electrodes by power supply；The a-road-through of oscillograph crosses high-voltage probe and two
The end of electrode is connected, the voltage curve for electric arc during measuring gas discharge；Another way is added in power supply by current probe
On the circuit formed with electrode, the current curve for measuring electric arc；The matching that one end connection size of the cells TEM is 50 Ω is negative
It carries, the other end is then connected with oscillograph, and the electromagnetic field of high frequency radiation energy dimidiation that such electrode discharge generates is by the cells TEM
Both ends receive, the radiation energy numerical value of electric arc is calculated in the voltage swing that can be obtained by oscilloscope measurement；Finally,
In conjunction with obtained electric arc gross energy and radiation energy is measured, formula can be substituted into：Eh=E-EeIn the specific of electric arc thermal energy is calculated
Numerical value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610453503.3A CN105866603B (en) | 2016-06-21 | 2016-06-21 | A kind of method and device measuring electric arc thermal energy using cross electromagnetic wave small room |
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| CN201610453503.3A CN105866603B (en) | 2016-06-21 | 2016-06-21 | A kind of method and device measuring electric arc thermal energy using cross electromagnetic wave small room |
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| CN105866603A CN105866603A (en) | 2016-08-17 |
| CN105866603B true CN105866603B (en) | 2018-08-07 |
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| CN107064673A (en) * | 2017-03-30 | 2017-08-18 | 上海理工大学 | Electric arc detecting device and double-fed wind power generator electric brush slip ring protection system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6248971B1 (en) * | 1998-05-12 | 2001-06-19 | Schneider Electric Sa | Circuit breaker with parallel connected pole compartments |
| CN1341860A (en) * | 2000-09-04 | 2002-03-27 | 太平洋精工株式会社 | Device and method for determining local short-circuit |
| CN101933394A (en) * | 2008-01-31 | 2010-12-29 | 西门子公司 | Method for determining a radiation measurement for thermal radiation, arc furnace, a signal processing device, programme code and storage medium for carrying out said method |
| CN204102278U (en) * | 2014-10-20 | 2015-01-14 | 浙江合极电气科技有限公司 | With the electric arc detecting device of multifunctional monitoring |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6968344B2 (en) * | 2001-07-26 | 2005-11-22 | Tata Consultancy Services Limited | Method and apparatus for object-oriented access to a relational database management system (RDBMS) based on any arbitrary predicate |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6248971B1 (en) * | 1998-05-12 | 2001-06-19 | Schneider Electric Sa | Circuit breaker with parallel connected pole compartments |
| CN1341860A (en) * | 2000-09-04 | 2002-03-27 | 太平洋精工株式会社 | Device and method for determining local short-circuit |
| CN101933394A (en) * | 2008-01-31 | 2010-12-29 | 西门子公司 | Method for determining a radiation measurement for thermal radiation, arc furnace, a signal processing device, programme code and storage medium for carrying out said method |
| CN204102278U (en) * | 2014-10-20 | 2015-01-14 | 浙江合极电气科技有限公司 | With the electric arc detecting device of multifunctional monitoring |
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