CN105021870A - Measurement method for induced voltage of cable terminal - Google Patents
Measurement method for induced voltage of cable terminal Download PDFInfo
- Publication number
- CN105021870A CN105021870A CN201510443086.XA CN201510443086A CN105021870A CN 105021870 A CN105021870 A CN 105021870A CN 201510443086 A CN201510443086 A CN 201510443086A CN 105021870 A CN105021870 A CN 105021870A
- Authority
- CN
- China
- Prior art keywords
- cable
- test
- tested
- induced voltage
- terminations
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Testing Relating To Insulation (AREA)
Abstract
According to the invention, based on an electromagnetic topology theory, by utilizing a principle that induced voltage on a cable can also be used for estimating influence on an electronic device by cable coupling and in view of a characteristic that the induced voltage only depends on the position of a to-be-detected point and an eternal electromagnetic field, a method of adding a testing cable in a cable port is employed and induced voltage of the to-be-tested cable port is converted to voltage of a test point of the testing cable. The induced voltage of the to-be-detected point is obtained through a measurement device, so that the induced voltage of the to-be-tested cable port is obtained easily and effectively. Therefore, testing data can be provided for analysis of influence on the internal electronic device by the external electromagnetic field through cable coupling. The method is simple and practical in operation and can be used for mass repeated tests, and is also irrelevant to terminal devices of the to-be-tested cable. The invention provides the effectively means for measurement, with specific precision requirements and counting in electromagnetic irradiation, of induced voltage of the cable terminal.
Description
Technical field
The present invention relates to a kind of measuring method of elect magnetic field induced voltage, particularly a kind of measuring method of elect magnetic field cable terminations induced voltage.
Background technology
Modern large scale electronic equipment complex structure, is vulnerable to impact and the interference of interior external electromagnetic field.Between equipment, connection cable is numerous, and part cable nakedly can be exposed on the external space.Relative to the electronic equipment being in inside cavity, the cable being in space outerpace, more easily by the impact of external electromagnetic field, is had an impact to whole equipment by hole coupling, hole coupling problem is on the rise.Hole coupling problem is the importance of complex electronic equipment and system EMC and electromagnetic protection research, for promote the performance of work of electronic equipment and system and resistivity for bad electromagnetic environment significant.The developing into of transmission line theory solves hole coupling problem and provides a kind of succinct effective method, and electromagnetic topology method is that solving of complicated cable bundle network provides theoretical foundation and implementation method.But be subject to the restriction of approximate condition, for the situation (more than 1GHz) that frequency is higher, existing transmission line theory and theory of development thereof all cannot effectively solve.Therefore, for hole coupling problem, from the angle of experimental test, by rational test design and correct method of testing, not only can meet the impact of quantitative predication hole coupling for internal unit, can also provide for follow-up theoretical research test figure as a reference and checking.
For electronic equipment under impressed field radiation condition, the Energy Coupling of cable mainly concentrates on for faradic measurement, and this is because each device of electronic equipment internal is vulnerable to the impact of super-high-current.But this also causes terminal device measurement faradic on cable being depended on to a great extent to cable simultaneously.When cable terminations is real impedance or cable structure is fairly simple, accurately induction current can be measured by carrying test circuit.If but during the cable terminations complex structure that is the electronic equipment of more complicated or cable own, existing measuring method realizes very difficult, need to carry a test circuit to root cable every in cable bundle, mutually the electric current by resistance should be obtained by the voltage at resistance two ends in circuit by measuring, the design of test circuit and carry that difficulty is large, quantity is many, not easily realizes.In theory, test circuit is utilized also to be the measuring method for voltage after all for the measurement of electric current.These test circuits itself have an impact to the duty and measurement result with equipment under test, and the measuring error caused by test circuit is all very difficult to eliminate in test and Data processing, and this will cause the inaccurate of measurement result.Improve the precision of test result and reliability if want, need to utilize Luo-coil or by pure optical fiber equipment.Utilize these equipment to carry out faradic measurement, effectively can reduce the error of measuring error and measuring equipment introducing, but Luo-coil needs to customize according to measuring condition, cost is high, pure fiber plant is domestic less, measures cost very high, is unfavorable for large-scale measurement and popularization.In sum, because the induction current difficulty measuring cable terminations is comparatively large, and very high for the dependency degree of terminal device, the Research Significance of induction current to hole coupling problem therefore measuring cable terminations is little.
And the existing research about measuring induced voltage, mostly concentrate between remote high-voltage power transmission cable and the induced voltage that produces of electromagnetic coupled between transmission cable and the earth, the induced voltage research for the cable terminations by the radiation-induced connection device of additional electromagnet source has no open source literature and delivers.
Summary of the invention
According to the conclusion of paper " On the Analysis of General Multiconductor Transmission-Line Networks ", under the prerequisite of known cable network and terminal device scattering matrix, the induced voltage of cable terminations or induction current can be utilized to assess the coupling effect of whole cable network.For the coupling effect of the cable network of complexity, as mentioned before, the induction current difficulty measuring cable terminations is comparatively large and have little significance, and therefore the present invention selects to measure the coupling effect of induced voltage research additional electromagnetic field for electronic equipment of cable terminations.
Theoretical based on electromagnetic topology, Topological Simplification is carried out to cable bundle network, measure the induced voltage of cable terminations, and the measurement of each point induced voltage on cable need not be considered, and for the measurement of cable terminations induced voltage, except considering the impact of cable itself, the size of induced voltage does not rely on terminal device and difficulty of test is less, and therefore the size of induced voltage only depends on tested point position and external electromagnetic field.The present invention is based on above-mentioned theory, a kind of method of cable port being added to test cable is proposed, and utilize the induced voltage impact of test cable on tested cable port very little, the induced voltage of tested cable port equals to test the conclusion of cable at test point voltage substantially, the induced voltage of test point is obtained by measuring equipment (as oscillograph and spectrum analyzer etc.), thus succinctly effectively record the induced voltage of tested cable port, provide test data by hole coupling for the impact of internal electronic equipment for analyzing external electromagnetic field.
The present invention's " a kind of measuring method of cable terminations induced voltage ", comprises the steps:
Step one: selected tested cable terminations is transformed.Draw test cable in tested cable terminations, and the shielding processing to externally-applied magnetic field is carried out to test cable leading point, prevent from producing induced voltage by extraction location;
Step 2: set up common reference ground.The ground wire of test cable is connected to the ground wire of tested cable, ensure test cable and tested cable with having common reference and impedance matching, meanwhile, the shielding processing to externally-applied magnetic field is carried out for test cable, prevent from affecting test data by the coupling effect of test cable;
Step 3: tested cable and terminal device thereof are connected, is positioned on testing table, adjusts the position of additional field source, under making tested cable be in the electromagnetic environment of test request;
Step 4: test cable terminations is connected to testing apparatus (as oscillograph, spectrum analyzer etc.), and testing apparatus is positioned over shield inside, under the condition with impressed field, measures induced voltage.
Draw the mode of testing cable from tested cable terminations in step one and have two kinds.
For the situation that tested cable is single line or shielding single line, the cable terminations of tested cable is needed to take apart, the heart yearn testing cable (being generally coaxial cable) is welded on the port of tested cable, then tested cable and the original cable connector of test cable are connected, and carry out the shielding & grounding process of test cable.
For the situation that tested cable is coaxial cable, need to transform the original terminal of tested coaxial cable, select the Wye end joint radio-frequency coaxial connector that mates with tested cable impedance and test cable, change original cable connector into Wye end joint radio-frequency coaxial connector, connect tested cable, test cable and relevant device respectively.For ensureing the accuracy of test result, need to carry out shielding processing to three-way connection and test cable connection.
The present invention chooses the induced voltage of cable terminations to analyze the coupling effect of cable bundle network, proposes a kind of measuring method measuring cable terminal induction voltage, effectively can measure the induced voltage of the cable terminations caused by additional electromagnetic field.The operation of this measuring method is relatively simple, a large amount of repeated test can be carried out, a kind of effective means being provided for the induced voltage measurement of the cable terminations caused by additional electromagnetic field irradiation in certain accuracy requirement, providing important parameter for analyzing additional electromagnetism for the coupling effect of cable bundle network and terminal device thereof.
Compared with the prior art, tool of the present invention has the following advantages:
(1) the present invention is by measuring the induced voltage of cable terminations, analyzes the coupling effect of cable bundle network, avoids the series of problems caused by test induction current;
(2) the present invention is based on electromagnetic topology theory, analyze the key event of original cable bundle network, only measure the induced voltage of cable terminations, and the measurement of each point induced voltage on cable need not be considered, transformation for cable is less, and measurement data is few but measurement result accuracy is high;
(3) the present invention directly measures the induced voltage of cable terminations, do not need to carry test circuit, therefore the error introduced by testing apparatus is less, and test result only depends on the position at additional electromagnetic field and cable terminations place, can ensure the accuracy of measurement result;
(4) the measurement response of peripheral electromagnetic field of the present invention mainly concentrates on measuring equipment, as long as therefore select suitable measuring equipment, can obtain relatively accurate test result, and be applicable to each frequency range;
(5) all can adopt three-way connector for the cable being similar to coaxial cable, process the method that the cable being similar to single line all can adopt port to access test cable, cost is low, simple to operate, is easy to realize.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is when in the embodiment of the present invention, tested cable is coaxial cable, the connection diagram of testing apparatus and Devices to test;
Fig. 2 is when in the embodiment of the present invention, tested cable is single line, the connection diagram of testing apparatus and Devices to test;
Fig. 3 is when in the present invention, tested cable is coaxial cable, tested cable terminations and the connection diagram of testing cable;
Fig. 4 is when in the present invention, tested cable is single line, tested cable terminations and the connection diagram of testing cable;
Fig. 5 be in the embodiment of the present invention feeder terminal in the test result of the induced voltage of L-band;
Fig. 6 be in the embodiment of the present invention single line terminal in the test result of the induced voltage of L-band.
Specific embodiments
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1: measure at the induced voltage of equipment end the feeder of aircraft ultrashort wave radio set, the connection of testing apparatus and Devices to test as shown in Figure 1.In Fig. 1, emitting antenna 1 is for emitting electromagnetic wave, form the plane electromagnetic wave that test needs, ultrashort wave radio set is Devices to test 3, ultrashort wave radio set is connected with antenna 2 by cable 6, wherein cable 6 is again by title feeder, when testing the induced voltage of coaxial cable terminal, electronic equipment 3 to be measured represents tested cable terminations position with the tie point A of tested cable 6, test cable 7 is drawn from A point, the other end is connected with shielded box 4, the built-in testing apparatus for testing induced voltage of shielded box 4, ultrashort wave radio set 3, tested cable 6, antenna 2 and test cable 7 are all placed on experiment table 5.
The present invention's " a kind of measuring method of cable terminations induced voltage ", its concrete steps are as follows:
Step one: selected tested cable 6 terminal is transformed.Draw test cable 7 in tested cable 6 terminal, and shielding processing is carried out to test cable 7 leading point A, prevent the induced voltage produced by extraction location A.Because crossing at A point with test cable 7 through the tested cable 6 of transformation, can think that the induced voltage of institute measuring point A is the induced voltage of cable 6 end points.
Illustrate below and how to draw test cable 7 from tested cable 6 terminal.
For the situation that tested cable is coaxial cable, as shown in Figure 3, tested cable 6 picks out from ultrashort wave radio set 3, need to transform the original terminal of tested coaxial cable 6, select with the Wye end joint radio-frequency coaxial connector 10 of tested cable 6 impedance matching and test cable 7, change original joint into Wye end joint radio-frequency coaxial connector 10, three of three-way connection 10 ports are connected respectively tested cable 6, test cable 7 and electronic equipment 3.For ensureing the accuracy of test result, need to carry out shielding processing to three-way connection 10 and test cable connection.
Step 2: set up common reference ground.The ground wire of test cable 7 is connected to the ground wire of tested cable 6, ensures that test cable 7 and tested cable 6 have common reference ground, meanwhile, shielding processing is done for test cable 7, ensure that test cable 7 does not affect test data;
Step 3: tested cable 6 is connected with ultrashort wave radio set 3, be positioned on testing table 5, adjust the position of additional emitting antenna 1, the distance making itself and testing table 5 is 1.0 meters, under making tested cable 6 be in the electromagnetic environment of test request, and meet the condition that test antenna used forms far field.The signal generator model adopted in the present embodiment is Agilent8257D, and output power is-10dBm, and Amplifier Model is Bonn BLMA0825-250W, and emitting antenna model is RGA60.
Step 4: test cable 7 terminal is connected to spectrum analyzer, and spectrum analyzer is positioned over the inside of shielded box 4, to eliminate the impact of additional field source for spectrum analyzer, thus realizes under the condition with impressed field, measures induced voltage.The spectrum analyzer model adopted in the present embodiment is AgilentE447, and sweep bandwidth (SPAN) is 1MHz, and sweep time is 1ms, RBW is 100kHz.
Fig. 5 represents under L-band (frequency is 1.0 ~ 2.0GHz) microwave irradiation, feeder terminal is in the induced voltage measurement result at A point place, transverse axis represents 101 frequencies (adjacent frequency is spaced apart 0.01GHz) at L-band uniform design, and the longitudinal axis represents tests at corresponding frequency the induced voltage obtained.
Embodiment 2: measure the induced voltage of the single line on aircraft ultrashort wave radio set in equipment end, the connection of testing apparatus and Devices to test as shown in Figure 2.In Fig. 2, emitting antenna 1 is for emitting electromagnetic wave, and form the plane electromagnetic wave that test needs, ultrashort wave radio set is Devices to test 3, and cable 11 is the single line connecting different port on ultrashort wave radio set.Ultrashort wave radio set 3 represents tested cable terminations position with the tie point B of tested cable 11, test cable 7 is drawn from B point, the other end is connected with shielded box 4, the built-in testing apparatus for testing induced voltage of shielded box 4, treats that ultrashort wave radio set 3, tested cable 11, antenna 2 and test cable 7 are all placed on experiment table 5.
The present invention's " a kind of measuring method of cable terminations induced voltage ", its concrete steps are as follows:
Step one: selected tested cable 11 terminal is transformed.Draw test cable 7 in tested cable 11 terminal, and shielding processing is carried out to test cable 7 leading point B, prevent the induced voltage produced by extraction location B.Because crossing at B point with test cable 7 through the tested cable 11 of transformation, can think that the induced voltage of institute measuring point A is the induced voltage of cable 11 end points.
Illustrate below and how to draw test cable 7 from tested cable 11 terminal.
For the situation that tested cable is single line or shielding single line, as shown in Figure 4, tested cable 11 picks out from ultrashort wave radio set 3, the cable terminations of tested cable 6 is needed to take apart, the heart yearn testing cable 7 (being generally coaxial cable) is welded on the port of tested cable 11, then tested cable 6 and the original cable connector 8 of test cable 7 are connected, and carry out the shielding & grounding process of test cable 7.
Step 2: set up common reference ground.The ground wire of test cable 7 is connected to the ground wire of tested cable 11, ensures that test cable 7 and tested cable 6 have common reference ground, meanwhile, shielding processing is done for test cable 7, ensure that test cable 7 does not affect test data;
Step 3: tested cable 11 is connected with ultrashort wave radio set 3, be positioned on testing table 5, adjust the position of additional emitting antenna 1, the distance making itself and testing table 5 is 1.0 meters, under making tested cable 11 be in the electromagnetic environment of test request, and meet the condition that test antenna used forms far field.The signal generator model adopted in the present embodiment is Agilent8257D, and output power is-35dBm, and Amplifier Model is Bonn BLMA0825-250W, and emitting antenna model is RGA60.
Step 4: test cable 7 terminal is connected to spectrum analyzer, and spectrum analyzer is positioned over the inside of shielded box 4, to eliminate the impact of additional field source for spectrum analyzer, thus realizes under the condition with impressed field, measures induced voltage.The spectrum analyzer model adopted in the present embodiment is AgilentE447, and sweep bandwidth (SPAN) is 1MHz, and sweep time is 1ms, RBW is 100kHz.
Fig. 6 represents under L-band (frequency is 1.0 ~ 2.0GHz) microwave irradiation, single line terminal is in the induced voltage measurement result at B point place, transverse axis represents 101 frequencies (adjacent frequency is spaced apart 0.01GHz) at L-band uniform design, and the longitudinal axis represents tests at corresponding frequency the induced voltage obtained.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (3)
1. a measuring method for cable terminations induced voltage, comprises the steps:
Step one: transform selected tested cable terminations, draws test cable in tested cable terminations, and carries out the shielding processing to externally-applied magnetic field to test cable leading point;
Step 2: set up common reference ground, is connected to the ground wire of tested cable by the ground wire of test cable, ensure that test cable and tested cable are with having common reference and impedance matching, meanwhile, for the shielding processing of testing cable and carrying out externally-applied magnetic field;
Step 3: tested cable and terminal device thereof are connected, is positioned on testing table, adjusts the position of additional field source, under making tested cable be in the electromagnetic environment of test request;
Step 4: test cable terminations is connected to testing apparatus, and testing apparatus is positioned over shield inside, under the condition with impressed field, measure induced voltage.
2. the measuring method of cable terminations induced voltage as claimed in claim 1, it is characterized in that, for the situation that tested cable is single line or shielding single line, the cable terminations of tested cable is needed to take apart, the heart yearn of test cable is welded on the port of tested cable, then tested cable and the original cable connector of test cable are connected, and shielding & grounding process is carried out to test cable.
3. the measuring method of cable terminations induced voltage as claimed in claim 1, it is characterized in that, for the situation that tested cable is coaxial cable, need to transform the original terminal of tested coaxial cable, select the three-way connection that mates with tested cable impedance and test cable, change original cable connector into Wye end joint radio-frequency coaxial connector, connect tested cable, test cable and relevant device respectively, and shielding processing is carried out to three-way connection and test cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510443086.XA CN105021870A (en) | 2015-07-26 | 2015-07-26 | Measurement method for induced voltage of cable terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510443086.XA CN105021870A (en) | 2015-07-26 | 2015-07-26 | Measurement method for induced voltage of cable terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105021870A true CN105021870A (en) | 2015-11-04 |
Family
ID=54411985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510443086.XA Pending CN105021870A (en) | 2015-07-26 | 2015-07-26 | Measurement method for induced voltage of cable terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105021870A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106124891A (en) * | 2016-06-21 | 2016-11-16 | 西南交通大学 | A kind of planar circuit test space electromagnetic interference method |
| CN112034223A (en) * | 2020-08-25 | 2020-12-04 | 杭州巨骐信息科技股份有限公司 | Isolation system between high-voltage circuit and data acquisition monitoring circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101498748A (en) * | 2009-03-20 | 2009-08-05 | 中国舰船研究设计中心 | Coaxial pulse voltage test device |
-
2015
- 2015-07-26 CN CN201510443086.XA patent/CN105021870A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101498748A (en) * | 2009-03-20 | 2009-08-05 | 中国舰船研究设计中心 | Coaxial pulse voltage test device |
Non-Patent Citations (3)
| Title |
|---|
| 潘晓东 等: "同轴电缆强电电磁脉冲辐照下的终端负载响应规律", 《高电压技术》 * |
| 潘晓东 等: "同轴电缆连续波电磁辐照的终端负载响应", 《强激光与粒子束》 * |
| 王浩 等: "雷电电磁脉冲场对多芯线的耦合效应研究", 《河北科技大学学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106124891A (en) * | 2016-06-21 | 2016-11-16 | 西南交通大学 | A kind of planar circuit test space electromagnetic interference method |
| CN112034223A (en) * | 2020-08-25 | 2020-12-04 | 杭州巨骐信息科技股份有限公司 | Isolation system between high-voltage circuit and data acquisition monitoring circuit |
| CN112034223B (en) * | 2020-08-25 | 2023-03-21 | 杭州巨骐信息科技股份有限公司 | Isolation system between high-voltage circuit and data acquisition monitoring circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102426310B (en) | Novel full aircraft high-strength irradiation test method | |
| CN103543342A (en) | Method and system for testing shielding performance of cable | |
| CN103163393A (en) | Electro-magnetic interference detecting system for power line conduction | |
| CN103235168B (en) | Measuring system for shunt vectors of metal frames of large ground grids on basis of wireless transmission | |
| CN202837416U (en) | System for testing shielding performance of cables | |
| Coenen | Measurement of partial discharges in power transformers using electromagnetic signals | |
| CN108287283A (en) | The test equipment and conducted immunity test method of a kind of impedance loop under industrial environment | |
| CN103063939B (en) | Ground cascade system external radio frequency electromagnetic environment test method | |
| CN105044494A (en) | Surface current injection measurement method used for electromagnetic compatibility test | |
| CN109752606A (en) | A kind of three coaxial test macros of radio frequency (RF) coaxial connector | |
| CN202351353U (en) | Electro-magnetic interference detecting system for power line conduction | |
| CN206584033U (en) | Bulk current injection test system check device | |
| CN109782100A (en) | A kind of test device and test method for the pincers calibration of automotive electronics capacitive coupling | |
| CN107561368B (en) | Measurement system and measurement method for broadband impedance characteristics of large-scale power equipment | |
| CN110412371A (en) | Multi-coaxial cable assembly shield effectiveness detection method based on probe method | |
| CN105021870A (en) | Measurement method for induced voltage of cable terminal | |
| JP6338830B2 (en) | Method for evaluating a device including a plurality of electric circuits | |
| Lacrampe et al. | Radiated suceptibility investigation of electronic board from near field scan method | |
| Tozzi | Partial discharge in power distribution electrical systems: Pulse propagation models and detection optimization | |
| CN207148223U (en) | A kind of measuring system of large scale electrical power unit wideband impedance operator | |
| CN109782101A (en) | A kind of calibration equipment and method of calibration for the test of automotive electronics conducted immunity | |
| Li et al. | An experimental analysis of the effects of wiring harness during bulk current injection (BCI) test | |
| Oppermann et al. | Proof-of-concept of a method for Contactless Vector Network Analysis Using impedance probes | |
| CN106405288A (en) | Method for obtaining electromagnetic transmission matrix of linear impedance stabilization network | |
| CN207730927U (en) | T/R component test system calibrating installations |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20151104 |