CN105866603A - Method and device for utilizing transverse electromagnetic wave chamber to measure arc heat energy - Google Patents
Method and device for utilizing transverse electromagnetic wave chamber to measure arc heat energy Download PDFInfo
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- CN105866603A CN105866603A CN201610453503.3A CN201610453503A CN105866603A CN 105866603 A CN105866603 A CN 105866603A CN 201610453503 A CN201610453503 A CN 201610453503A CN 105866603 A CN105866603 A CN 105866603A
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- electric arc
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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 invention relates to a method and a device for utilizing a transverse electromagnetic wave chamber to measure arc heat energy. The specific value of the arc heat energy is acquired by measuring the voltage and current information of gas discharge arc, utilizing a measure result of the arc heat energy, combining with the electromagnetic radiation energy generated by the arc measured by the TEM chamber and then calculating. The method comprises the following steps: (1) measuring the voltage and current information of the gas arc; (2) adopting a mathematical method for integrating the product of voltage and current on a time axis, thereby acquiring the total energy of the arc; (3) utilizing the transverse electromagnetic (TEM) chamber to measure the electromagnetic radiation energy of the arc; (4) reducing the electromagnetic radiation of the arc from the total energy of the arc, thereby acquiring the heat energy of the arc. The method provided by the invention has the advantages of safety, reliability, flexible operation and indirect measurement for the heat energy of the arc.
Description
Technical field
The present invention relates to a kind of method and device measuring electric arc heat energy, particularly relate in strong electromagnetic environment by indirectly measuring
The method obtaining electric arc heat energy, belongs to technical field of electromagnetic compatibility measurement.
Background technology
In air, electric-field strength is to a certain extent, and gas molecule will be ionized, and forms plasma, and produces of short duration putting
Electricity electric current, makes electric charge be consumed or neutralizes, sending light and heat, and produce sound.Spark discharge general persistence is the shortest,
Needed for the electric field intensity that reaches the highest, such field intensity is generally present between the tip of two conducting metal bodies, because of and
It is referred to as point discharge.
Strong-electromagnetic field environment can make to produce certain electric potential difference between different metallic conductor tips, when electric potential difference is sufficiently large also
When making the electric field in air reach the field intensity needed for point discharge, the spark of arc discharge can be formed.The electric arc that electric discharge produces
(spark) has obvious voltage and current characteristics, and can discharge light and heat.
The discharge current persistent period that discharge spark produces at electrode two ends is the shortest, and its spectral characteristic has the strongest high frequency division
Amount, thus spark can externally produce certain electromagnetic radiation；The mixed gas igniting of fuel gas or air fuel gas is by heat
Effect causes, and the heat energy that discharge spark produces can make fuel gas light, when fuel gas is positioned at a chamber closed
Time internal, also has the danger that blast occurs.
At present, conventional method is directly test, is determined the conclusion of test by the state observing fuel tank.The method is not required to
Want other test devices, it is simple to implement.
But, direct method of testing there is also some shortcomings being difficult to overcome: first, and direct method of testing is the most dangerous, place
It is not easy controlled after the fuel-steam of confined space is ignited, even has the danger of blast；Directly method of testing is only capable of carrying out
Qualitative analysis, its result of the test is only effective to experimental condition, cannot obtain the relevant information of electromagnetic radiation energy simultaneously, because of
And quantized data cannot be obtained, so the result under other experimental conditions cannot be assessed by test data.
Summary of the invention
It is an object of the invention to overcome the deficiency of existing method and technology, it is provided that one utilizes cross electromagnetic wave small room to measure electric arc
The method and device of heat energy, has safe and reliable, flexible operation, the advantage that can indirectly measure electric arc heat energy.
To achieve these goals, the present invention proposes one and utilizes transverse electro-magnetic wave (TEM) cell measurement electric arc heat energy
Method, utilizes the measurement result of electric arc gross energy, is combined with the electromagnetism spoke of the electric arc generation that TEM cell measurement obtains
Penetrate energy, then by calculating the concrete numerical value obtaining electric arc heat energy.The method comprises the steps of
The gross energy of electric arc is calculated according to the voltage and current information measuring the electric arc obtained；
TEM cell is utilized to measure the electromagnetic radiation energy of electric arc；
The electromagnetic radiation energy that the gross energy of electric arc deducts electric arc obtains the heat energy of electric arc.
The gross energy that gas discharge produces can be divided into two large divisions, and a part is that the light and heat discharged due to electric arc produces
Heat energy, another part be due to electric arc discharge current produce electromagnetic radiation energy.Therefore the electricity obtained by measurement
The gross energy of arc and electromagnetic radiation energy, just can indirectly obtain the heat energy E of electric arc by following formulah: Eh=E-Ee。
TEM cell is an airtight TEM ripple transmission structure being similar to coaxial line, is usually used in electromagnetic compatibility (EMC)
Test with electromagnetic interference (EMI), there is the features such as field strength distribution is uniform and controlled.Owing to TEM cell is to close
Electromagnetic transmission structure, the heat energy of the electric arc therefore produced between electrode will not be detected, and only can pass through cell two ends
Port detecting is to the electromagnetic radiation energy E of electric arce.By a port termination matched load of TEM cell, another port
It is connected with oscillograph, then oscillograph will receive the electromagnetic radiation energy of electric arc half.Obtained by oscilloscope measurement
Magnitude of voltage just can calculate the electromagnetic radiation energy of electric arcIn formula, UeIt it is the electricity of oscilloscope measurement acquisition
Pressure root-mean-square value, R0It it is the size of termination matching load.
Gas is accumulated in after the electric charge of two end electrodes punctures, and the electric arc of generation has obvious voltage and current characteristics, can
To be observed and to measure voltage and the current curve of electric arc by oscillograph.The data of measurement are recorded, by mathematics side
Method, can be calculated the electric discharge gross energy of electric arc exactly.The electric discharge gross energy computing formula of electric arc:
In formula: E is the gross energy that arc discharge produces, and U is the voltage between two ends of electric arc, and I is the electric current of electric arc, t0It is
The initial time that electric arc produces, t1It it is the finish time of arc extinction.
The present invention proposes to use the TEM cell method of indirectly measuring electric arc heat energy, is directly measured by oscillograph and obtains
The gross energy of electric arc, in conjunction with the electromagnetic radiation energy of the electric arc that TEM cell measurement obtains, is calculated the tool of electric arc heat energy
Body numerical value.
The one of the present invention utilizes cross electromagnetic wave small room to measure electric arc heat energy apparatus, including: TEM cell, sparking electrode,
Various cables that 50 Ω matched loads, oscillograph normally work with a holding equipment and power supply etc.；In process of the test, will
Sparking electrode is placed in the middle of TEM cell, provides energy to two sparking electrodes by power supply.Oscillographic lead up to
The end of high-voltage probe and two electrodes is connected, the voltage curve of electric arc during measuring gas discharge；Separately lead up to
Current probe is added on the loop of power supply and electrode formation, for measuring the current curve of electric arc；One end of TEM cell is even
Connecing the matched load that size is 50 Ω, the other end is then connected with oscillograph, the electromagnetic field of high frequency spoke that such electrode discharge produces
Penetrate energy dimidiation to be received by the two ends of TEM cell, the voltage swing that just can be obtained by oscilloscope measurement, meter
Calculate the radiation energy numerical value obtaining electric arc.Finally, in conjunction with measure the electric arc gross energy that obtains and radiation can, can substitute into formula:
Eh=E-EeIn be calculated the concrete numerical value of electric arc heat energy.
The present invention has a following evident characteristic:
(1) a kind of method utilizing cross electromagnetic wave small room to measure electric arc heat energy of the present invention uses the mode indirectly measured, suitable
For measuring the heat energy of gas discharge arc under various experimental condition, use and convenience, safety are set；
(2) spoke that the aim parameter that a kind of method utilizing cross electromagnetic wave small room to measure electric arc heat energy of the present invention is measured is electric arc
Penetrating energy, use the electromagnetic transmission structure TEM cell of closing, electromagnetic radiation No leakage, test result is accurate
Degree height；
(3) a kind of method utilizing cross electromagnetic wave small room to measure electric arc heat energy of the present invention is made with the energy values relation of electric arc
For basis, test data can quantify record and pass judgment on.
Accompanying drawing explanation
Fig. 1 is the flow chart of a kind of method utilizing cross electromagnetic wave small room to measure electric arc heat energy of the present invention；
Fig. 2 is the embodiment flow process signal of a kind of method utilizing cross electromagnetic wave small room to measure electric arc heat energy of the application present invention
Figure；
Fig. 3 is a kind of layout schematic diagram utilizing cross electromagnetic wave small room to measure electric arc heat energy apparatus of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment the present invention is described in detail.
As it is shown in figure 1, the gross energy that gas discharge produces can be divided into two large divisions, a part is owing to electric arc discharges
Light and heat produce heat energy, another part be due to electric arc discharge current produce electromagnetic radiation energy.Therefore to
Obtain the concrete numerical value of electric arc heat energy, it is necessary to by measuring the gross energy and electromagnetic radiation energy obtaining electric arc.
The gross energy of electric arc can be obtained by oscilloscope measurement.The electric arc that gas discharge produces has obvious voltage and electricity
Properties of flow, utilizes oscillographic high-voltage probe can measure the voltage curve of electric arc during electric discharge, utilizes current probe permissible
Measure the current curve during electric discharge, the curve storage of measurement is recorded, relend and help energy and voltage and electricity on circuit
The relation of stream, can be calculated the electric discharge gross energy of electric arc exactly.The electric discharge gross energy computing formula of electric arc:The radiation of electric arc can be obtained by TEM cell measurement.By oscilloscope measurement TEM cell
The rms voltage of one port, can calculate the electromagnetic radiation energy of electric arcFinally, in conjunction with
Measure the electric arc gross energy and radiation energy obtained, formula can be substituted into: Eh=E-EeIn be calculated the tool of electric arc heat energy
Body numerical value.
As in figure 2 it is shown, mounting arrangements is used for the instrument and equipment of detection the most as shown in Figure 3 in process of the test, then according to
Testing procedure is tested, and obtains and record the electromagnetic field signal of electric arc in discharge process, the electricity obtained finally according to test
Pressure and current data, substitute into respective formula and calculate, obtain the test result of test.
As it is shown on figure 3, assay device mainly includes TEM cell, sparking electrode, 50 Ω matched loads, an oscillography
Various cables that device and holding equipment normally work and power supply etc..In process of the test, sparking electrode is placed in TEM cell
In the middle of, provide energy to two sparking electrodes by power supply.Oscillographic lead up to high-voltage probe and the end of two electrodes
End is connected, the voltage curve of electric arc during measuring gas discharge；Current probe of separately leading up to is added in power supply and electrode
On the loop formed, for measuring the current curve of electric arc；One end of TEM cell connects the coupling that size is 50 Ω and bears
Carrying, the other end is then connected with oscillograph, and the electromagnetic field of high frequency emittance dimidiation that such electrode discharge produces is by TEM
The two ends of cell receive, and the voltage swing that just can be obtained by oscilloscope measurement is calculated the radiation energy numerical value of electric arc.
There is provided above example to be only used to describe the purpose of the present invention, and be not intended to limit the scope of the present invention.This
Bright scope is defined by the following claims.Various equivalents made without departing from spirit and principles of the present invention and repairing
Change, all should contain within the scope of the present invention.
Claims (4)
1. one kind utilizes the method that cross electromagnetic wave small room measures electric arc heat energy, it is characterised in that comprise the following steps:
(1) voltage and the current information of gaseous arc are measured；
(2) use mathematical method that the product integration on a timeline of voltage Yu electric current draws the gross energy of electric arc；
(3) transverse electro-magnetic wave TEM cell is utilized to measure the electromagnetic radiation energy of electric arc；
(4) electromagnetic radiation energy that the gross energy of electric arc deducts electric arc obtains the heat energy of electric arc.
The method utilizing cross electromagnetic wave small room to measure electric arc heat energy the most according to claim 1, it is characterised in that:
In described step (2), the gross energy computing formula of electric arc:In formula: E is that arc discharge produces
Gross energy, U is the voltage between two ends of electric arc, and I is the electric current of electric arc, t0It is the initial time of electric arc generation, t1It is
The finish time of arc extinction.
The method utilizing cross electromagnetic wave small room to measure electric arc heat energy the most according to claim 1, it is characterised in that:
In described step (3), the process utilizing the electromagnetic radiation energy of transverse electro-magnetic wave TEM cell measurement electric arc is as follows: will
One port termination matched load of TEM cell, another port is connected with oscillograph, and oscillograph will receive electric arc
The electromagnetic radiation energy of half, the magnitude of voltage obtained by oscilloscope measurement just can calculate the electromagnetic radiation energy of electric arcIn formula, UeIt is the rms voltage of oscilloscope measurement acquisition, R0It it is the size of termination matching load.
4. one kind utilizes cross electromagnetic wave small room to measure electric arc heat energy apparatus, it is characterised in that including: TEM cell, electric discharge
Various cables that electrode, 50 Ω matched loads, oscillograph normally work with a holding equipment and power supply etc.；Process of the test
In, sparking electrode is placed in the middle of TEM cell, provides energy to two sparking electrodes by power supply；Oscillographic one
Road is connected by the end of high-voltage probe and two electrodes, the voltage curve of electric arc during measuring gas discharge；Another
Road is added on the loop of power supply and electrode formation by current probe, for measuring the current curve of electric arc；TEM cell
One end connects the matched load that size is 50 Ω, and the other end is then connected with oscillograph, the high-frequency electrical that such electrode discharge produces
Magnetic field radiation energy dimidiation is received by the two ends of TEM cell, and the voltage that just can be obtained by oscilloscope measurement is big
Little, it is calculated the radiation energy numerical value of electric arc；Finally, in conjunction with measuring the electric arc gross energy and radiation energy, Ke Yidai obtained
Enter formula: Eh=E-EeIn be calculated the concrete numerical value of electric arc heat energy.
Priority Applications (1)
| 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 true CN105866603A (en) | 2016-08-17 |
| CN105866603B CN105866603B (en) | 2018-08-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| 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 |
| US20030033277A1 (en) * | 2001-07-26 | 2003-02-13 | Bahulkar Arun Gajanan | Method and apparatus for object-oriented access to a relational database management system (RDBMS) based on any arbitrary predicate |
| 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 |
-
2016
- 2016-06-21 CN CN201610453503.3A patent/CN105866603B/en active Active
Patent Citations (5)
| 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 |
| US20030033277A1 (en) * | 2001-07-26 | 2003-02-13 | Bahulkar Arun Gajanan | Method and apparatus for object-oriented access to a relational database management system (RDBMS) based on any arbitrary predicate |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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