CN109212325B - Power cable crosstalk coupling test method - Google Patents
Power cable crosstalk coupling test method Download PDFInfo
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- CN109212325B CN109212325B CN201811203050.4A CN201811203050A CN109212325B CN 109212325 B CN109212325 B CN 109212325B CN 201811203050 A CN201811203050 A CN 201811203050A CN 109212325 B CN109212325 B CN 109212325B
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- 230000008878 coupling Effects 0.000 title claims abstract description 95
- 238000010168 coupling process Methods 0.000 title claims abstract description 95
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 95
- 238000010998 test method Methods 0.000 title claims abstract description 8
- 230000005284 excitation Effects 0.000 claims abstract description 70
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000012360 testing method Methods 0.000 claims description 33
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 10
- 239000000523 sample Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0871—Complete apparatus or systems; circuits, e.g. receivers or amplifiers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
- G01R29/0835—Testing shielding, e.g. for efficiency
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- Electromagnetism (AREA)
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- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a power cable crosstalk coupling test method, which comprises the steps of arranging two cables on the same plane, wherein the two cables are an excitation cable and a coupling cable respectively; connecting one end of the excitation cable with an alternating current power supply, and connecting the other end of the excitation cable with a corresponding matched power load; connecting one end of the coupling cable with a direct current power supply, and connecting the other end of the coupling cable with a direct current load; an oscilloscope is connected to the high-order line of the coupling cable; the voltage waveforms on the coupling cables under the condition of no power and the condition of power on of the excitation cables are tested respectively, and the interference of the excitation cables on the coupling cables is obtained; the method of the invention utilizes the oscilloscope to detect the voltage waveform through the combined use of the excitation cable and the coupling cable, thereby solving the technical problem that the mutual coupling performance of the cables in actual work can not be fully embodied, and further obtaining the interference true value of the mutual coupling performance of the cables in actual work; the method has the advantages of simple structure, easy operation and low detection cost.
Description
Technical Field
The invention relates to the field of power cables, in particular to a power cable crosstalk coupling test method.
Background
When a product passes EMC test, the condition that the test is not passed due to the interference of a power line to other cables often occurs, and the condition is caused because the current on the power line has the characteristics of low frequency and high amplitude, and the coupling interference effect on surrounding cables is not negligible, so that the research on the coupling performance between cables is one of main ways for solving the EMC problem.
In the prior art, a common cable crosstalk test mode is to evaluate cable coupling performance by measuring cable S parameters through network division, and the method specifically comprises the following steps: the two cables are respectively connected to the ports 1 and 2 of the network, the other end is connected with a matched load, and the measured S21 parameter is the crosstalk value.
Disclosure of Invention
The invention provides a power cable crosstalk coupling test method, which aims to solve the technical problem that the mutual coupling performance of cables in actual work cannot be fully embodied, so as to obtain the interference value of the mutual coupling performance of the cables in actual work, and further realize the interference true value of the mutual coupling performance of the cables in actual work.
In order to solve the above technical problems, an embodiment of the present invention provides a power cable crosstalk coupling testing method, including:
two cables are arranged on the same plane, and the two cables are an excitation cable and a coupling cable respectively;
connecting one end of the excitation cable with an alternating current power supply, and connecting the other end of the excitation cable with a corresponding matched power load;
connecting one end of the coupling cable with a direct current power supply, and connecting the other end of the coupling cable with a direct current load;
an oscilloscope is connected to the high-order line of the coupling cable;
the voltage waveforms on the coupling cables under the condition of no power and the condition of power on of the excitation cables are tested respectively, and the interference of the excitation cables on the coupling cables is obtained;
as a preferred solution, the testing the voltage waveforms on the coupling cable under the condition of no power and the condition of power to obtain the interference of the coupling cable by the excitation cable includes:
testing the voltage waveform of the coupling cable under the condition that the exciting cable is not electrified, and recording the voltage waveform as a first voltage waveform;
testing the voltage waveform of the coupling cable under the condition of electrifying the excitation cable, and recording the voltage waveform as a second voltage waveform;
combining the numerical ranges of the first voltage waveform and the second voltage waveform to obtain interference of the excitation cable on the coupling cable;
as a preferable scheme, the testing method further comprises the step of connecting a line impedance stabilizing network LISN in an excitation cable circuit, wherein one end of the LISN is connected with the excitation cable, and the other end of the LISN is connected with the alternating current power supply;
preferably, the position relationship of the excitation cable and the coupling cable is parallel;
as a preferable scheme, the load connected with the excitation cable and the load connected with the coupling cable are electric furnaces;
preferably, the alternating current power supply is a single-phase alternating current power supply or a three-phase alternating current power supply;
as a preferable scheme, the single-phase alternating-current power supply is 220V,50Hz single-phase alternating-current power supply or 115V,400Hz single-phase alternating-current power supply;
as a preferable scheme, the three-phase alternating current power supply is 380V,50Hz three-phase alternating current power supply;
preferably, the direct current power supply is a 28V direct current power supply.
A power cable crosstalk coupling testing method, comprising:
two cables are arranged on the same plane, and the two cables are an excitation cable and a coupling cable respectively;
connecting one end of the excitation cable with an alternating current power supply, and connecting the other end of the excitation cable with a corresponding matched power load;
connecting one end of the coupling cable with a direct current power supply, and connecting the other end of the coupling cable with a direct current load;
an oscilloscope is connected to the high-order line of the coupling cable;
the voltage waveforms on the coupling cables under the condition of no power and the condition of power on of the excitation cables are tested respectively, and the interference of the excitation cables on the coupling cables is obtained;
the method for testing the voltage waveforms on the coupling cables under the condition of no power and the condition of power on of the excitation cables respectively to obtain the interference of the excitation cables on the coupling cables comprises the following steps:
testing the voltage waveform of the coupling cable under the condition that the exciting cable is not electrified, and recording the voltage waveform as a first voltage waveform;
testing the voltage waveform of the coupling cable under the condition of electrifying the excitation cable, and recording the voltage waveform as a second voltage waveform;
combining the numerical ranges of the first voltage waveform and the second voltage waveform to obtain interference of the excitation cable on the coupling cable;
the test method further comprises the step of connecting a line impedance stabilizing network LISN in an excitation cable circuit, wherein one end of the LISN is connected with the excitation cable, and the other end of the LISN is connected with the alternating current power supply;
the position relationship between the excitation cable and the coupling cable is parallel;
the load connected with the excitation cable and the load connected with the coupling cable are electric furnaces;
the alternating current power supply is a single-phase alternating current power supply or a three-phase alternating current power supply;
the single-phase alternating current power supply is 220V,50Hz single-phase alternating current power supply or 115V,400Hz single-phase alternating current power supply;
the three-phase alternating current power supply is 380V,50Hz three-phase alternating current power supply;
the direct current power supply is a 28V direct current power supply.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
1. through the combined use of the excitation cable and the coupling cable, the voltage waveform is detected by using an oscilloscope, and the interference true value of the mutual coupling performance of the cable in the actual work is obtained.
2. Simple structure, easy operation and low detection cost.
Drawings
Fig. 1: the method is a specific step flow diagram of an embodiment of the method;
fig. 2: is a schematic flow chart of step S5 in the method embodiment of the present invention;
fig. 3: the method is a schematic diagram for testing crosstalk of the single-phase alternating current to direct current cable in the embodiment of the method;
fig. 4: the embodiment diagram of the crosstalk test of the single-phase alternating current to direct current cable in the embodiment of the method is shown;
fig. 5: an example diagram of connecting an oscilloscope probe with a high potential line in the embodiment of the method is shown;
fig. 6: the method is a schematic diagram for testing crosstalk of the three-phase alternating current to direct current cable in the embodiment of the method;
fig. 7: the method is a diagram of an example of testing crosstalk of the three-phase alternating current to direct current cable in the embodiment of the method.
In the figure: 1. a load; 2. an excitation cable; 3. a coupling cable; 4. a direct current power supply; 5. LISN.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a preferred embodiment of the present invention provides a power cable crosstalk coupling testing method, including:
s1, arranging two cables on the same plane, wherein the two cables are an excitation cable and a coupling cable respectively;
s2, connecting one end of the excitation cable with an alternating current power supply, and connecting the other end of the excitation cable with a corresponding matched power load;
s3, connecting one end of the coupling cable with a direct current power supply, and connecting the other end of the coupling cable with a direct current load;
s4, accessing an oscilloscope on a high-level line of the coupling cable;
and S5, respectively testing voltage waveforms on the coupling cables under the condition of no power and the condition of power on of the excitation cable, and obtaining interference of the excitation cable on the coupling cable.
According to the embodiment, through the combined use of the excitation cable and the coupling cable, the voltage waveform is detected by using the oscilloscope, and the interference reality value of the mutual coupling performance of the cables in actual work is obtained.
Referring to fig. 2, in this embodiment, the testing voltage waveforms on the coupling cable under the condition of no power and the condition of power of the excitation cable respectively, to obtain interference of the excitation cable on the coupling cable includes:
s51, testing the voltage waveform of the coupling cable of the excitation cable under the condition of no power on, and recording the voltage waveform as a first voltage waveform;
s52, testing the voltage waveform of the coupling cable of the excitation cable under the condition of electrifying, and recording the voltage waveform as a second voltage waveform;
and S53, combining the numerical ranges of the first voltage waveform and the second voltage waveform to obtain the interference of the excitation cable on the coupling cable.
In this embodiment, the line impedance stabilizing network LISN is connected to the exciting cable circuit, and one end of the LISN is connected to the exciting cable, and the other end is connected to the ac power supply.
In this embodiment, the positional relationship of the excitation cable and the coupling cable is parallel.
In this embodiment, the load connected to the excitation cable and the load connected to the coupling cable are both electric furnaces.
In this embodiment, the ac power source is a single-phase ac power source or a three-phase ac power source.
In this embodiment, the single-phase ac power source is 220v,50hz single-phase ac power source or 115v,400hz single-phase ac power source.
In this embodiment, the three-phase ac power supply is 380v,50hz three-phase ac power supply.
In this embodiment, the dc power supply is a 28V dc power supply.
The specific implementation process of this embodiment is as follows:
referring to fig. 3, in an embodiment, we test a single phase ac power supply: first, a test is performed on a test table in a shielded room, and two cables are placed in parallel. One of the cables is an excitation cable (i.e. an interference cable), the excitation cable is connected with an external power supply through the LISN to supply power, and the other end of the excitation cable is connected with a corresponding matched power load. Here LISN has two roles: firstly, providing stable impedance for an output end; and secondly, the influence of interference of the isolated power supply end on the excitation cable is isolated. The other cable is a coupling cable (i.e. an interfered cable), one end of the coupling cable is connected with a direct current source, and the other end of the coupling cable is connected with a direct current load. The excitation cable and the coupling cable both take an electric furnace as termination load. The voltage waveform on the line is detected on the high-order line of the coupling cable by an oscilloscope.
Fig. 3 is a schematic diagram of a crosstalk connection between a single-cross-section streamline cable and a direct-current cable, wherein the coupling length L and the spacing d can be adjusted according to practical situations or experimental requirements. Common single-phase alternating currents include: 220V50Hz, 115V 400Hz, which are consistent with the experimental arrangement of dc cable crosstalk. For two common types of single-phase alternating current cables, an actual connection schematic diagram of the direct current cable crosstalk is shown in fig. 4, and waveform acquisition of an oscilloscope probe on a high-order line is shown in fig. 5. Firstly, testing a voltage waveform on the coupling cable under the condition that the exciting cable is not electrified, and recording the voltage waveform as a first voltage waveform; then, the voltage waveform on the coupling cable of the excitation cable is tested under the condition of electrifying, and the voltage waveform is recorded as a second voltage waveform; and finally, combining the numerical ranges of the first voltage waveform and the second voltage waveform to obtain the interference of the excitation cable on the coupling cable.
The method can also analyze three-phase alternating current:
referring to fig. 6 and 7, in this embodiment, we test a three-phase ac power supply, for example, the ac power supply in fig. 6 is a three-phase ac power supply of 380V 50hz, and a schematic cross-talk connection diagram and an actual test connection diagram of the three-phase ac power supply to a 28V dc cable (to distinguish from a single-phase ac cable to dc cable cross-talk test, a certain included angle is formed between the three-phase ac cable and the dc cable).
And finally, respectively measuring the voltage waveforms on the coupling cable under the condition that the excitation cable is not electrified and the condition that the excitation cable is electrified, so that the interference of the excitation cable on the coupling cable can be obtained.
The method is not limited to three common power cable types (220V 50Hz and 115V 400Hz;380V 50Hz) provided by the patent, and the crosstalk test of other alternating current power cable types on the direct current power cable is manufactured through a programmable power supply and is consistent with the crosstalk test method provided by the patent.
According to the invention, through the combined use of the excitation cable and the coupling cable, the voltage waveform is detected by using the oscilloscope, so that the technical problem that the mutual coupling performance of the cables in actual work cannot be fully reflected is solved, and further, the interference true value of the mutual coupling performance of the cables in actual work is obtained; the method has the advantages of simple structure, easy operation and low detection cost.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present invention, and are not to be construed as limiting the scope of the invention. It should be noted that any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without departing from the spirit and principles of the present invention are intended to be included in the scope of the present invention.
Claims (1)
1. A power cable crosstalk coupling testing method, comprising:
two cables are arranged on the same plane, and the two cables are an excitation cable and a coupling cable respectively;
connecting one end of the excitation cable with an alternating current power supply, and connecting the other end of the excitation cable with a corresponding matched power load;
connecting one end of the coupling cable with a direct current power supply, and connecting the other end of the coupling cable with a direct current load;
an oscilloscope is connected to the high-order line of the coupling cable;
the voltage waveforms on the coupling cables under the condition of no power and the condition of power on of the excitation cables are tested respectively, and the interference of the excitation cables on the coupling cables is obtained;
the method for testing the voltage waveforms on the coupling cables under the condition of no power and the condition of power on of the excitation cables respectively to obtain the interference of the excitation cables on the coupling cables comprises the following steps:
testing the voltage waveform of the coupling cable under the condition that the exciting cable is not electrified, and recording the voltage waveform as a first voltage waveform;
testing the voltage waveform of the coupling cable under the condition of electrifying the excitation cable, and recording the voltage waveform as a second voltage waveform;
combining the numerical ranges of the first voltage waveform and the second voltage waveform to obtain interference of the excitation cable on the coupling cable;
the test method further comprises the step of connecting a line impedance stabilizing network LISN in an excitation cable circuit, wherein one end of the LISN is connected with the excitation cable, and the other end of the LISN is connected with the alternating current power supply;
the position relationship between the excitation cable and the coupling cable is parallel;
the matched power load connected with the excitation cable and the direct current load connected with the coupling cable are electric furnaces;
the alternating current power supply is a single-phase alternating current power supply or a three-phase alternating current power supply;
the single-phase alternating current power supply is 220V,50Hz single-phase alternating current power supply or 115V,400Hz single-phase alternating current power supply;
the three-phase alternating current power supply is 380V,50Hz three-phase alternating current power supply;
the direct current power supply is a 28V direct current power supply.
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| CN201811203050.4A CN109212325B (en) | 2018-10-16 | 2018-10-16 | Power cable crosstalk coupling test method |
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| CN201811203050.4A CN109212325B (en) | 2018-10-16 | 2018-10-16 | Power cable crosstalk coupling test method |
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| CN109900987B (en) * | 2019-03-13 | 2021-08-17 | 上海市计量测试技术研究院 | Multifunctional decoupling network |
| CN110488118A (en) * | 2019-08-06 | 2019-11-22 | 上海移为通信技术股份有限公司 | The anti-interference test method and its system of power supply chip |
| CN110554247A (en) * | 2019-08-28 | 2019-12-10 | 广州广电计量检测股份有限公司 | crosstalk simulation modeling method and simulation model of non-parallel cable |
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