CN112578185A - Device and method for testing direct current resistance of conductor bearing electromagnetic coupling induced potential - Google Patents
Device and method for testing direct current resistance of conductor bearing electromagnetic coupling induced potential Download PDFInfo
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- CN112578185A CN112578185A CN202011266978.4A CN202011266978A CN112578185A CN 112578185 A CN112578185 A CN 112578185A CN 202011266978 A CN202011266978 A CN 202011266978A CN 112578185 A CN112578185 A CN 112578185A
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- 239000004020 conductor Substances 0.000 title claims abstract description 108
- 238000012360 testing method Methods 0.000 title claims abstract description 93
- 230000008878 coupling Effects 0.000 title claims abstract description 24
- 238000010168 coupling process Methods 0.000 title claims abstract description 24
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000001629 suppression Effects 0.000 claims abstract description 30
- 230000006698 induction Effects 0.000 claims description 26
- 239000003990 capacitor Substances 0.000 claims description 10
- 230000002401 inhibitory effect Effects 0.000 claims description 7
- 230000001939 inductive effect Effects 0.000 claims 6
- 239000000203 mixture Substances 0.000 claims 1
- 239000002994 raw material Substances 0.000 claims 1
- 230000000452 restraining effect Effects 0.000 claims 1
- 239000002184 metal Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- -1 length 500 meters Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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Abstract
The invention discloses a device and a method for testing direct current resistance of a conductor bearing electromagnetic coupling induced potential, which are provided with an alternating current suppression device for suppressing alternating current of a conductor to be tested and/or an alternating current access device for providing access for alternating current of the conductor to be tested, can also carry out direct current resistance test without changing the conductor to be tested into a passive state, realize the direct current resistance test of the conductor with the electromagnetic coupling induced potential, and have high test efficiency.
Description
Technical Field
The invention relates to a device and a method for testing direct current resistance of a conductor bearing electromagnetic coupling induction potential, belonging to the field of direct current resistance testing.
Background
When the traditional metal conductor has an alternating current coupling induced potential, the tested metal conductor needs to be changed into a passive state (such as methods of turning off an alternating current power supply, separating the tested conductor from an alternating current interference source and the like), and a direct current resistance test is realized by injecting a direct current source to obtain voltage and current on two sides of the conductor. The method needs to change the conductor into a passive state first, so the testing efficiency is low
Disclosure of Invention
The invention provides a device and a method for testing direct current resistance of a conductor bearing electromagnetic coupling induction potential, which solve the problem of low efficiency of the existing testing method.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the device for testing the direct current resistance of the conductor bearing the electromagnetic coupling induced potential comprises a direct current voltage testing device, a direct current power supply and an alternating current inhibiting device;
the alternating current suppression device is connected with the tested conductor in series and used for suppressing alternating current in the tested conductor;
the direct current power supply supplies power to the series circuit;
the direct current voltage testing device and the direct current testing device respectively test the direct current voltage and the direct current in the series circuit.
The AC suppression device satisfies: the impedance of the alternating current suppression device is not less than the impedance corresponding to the alternating current induction peak voltage of the detected conductor;
the direct current power supply satisfies:
wherein IOutput of、VPeak(s)、ZSuppression of、ZStraight insideThe maximum direct current output by the direct current power supply, the alternating current induction peak voltage of the detected conductor, the impedance of the alternating current suppression device and the internal impedance value of the direct current power supply are respectively.
The alternating current suppression device is an inductor or a resistor.
The device for testing the direct current resistance of the conductor bearing the electromagnetic coupling induced potential comprises a direct current voltage testing device, a direct current power supply and an alternating current access device;
the alternating current access device is connected with the tested conductor in parallel and used for providing access to alternating current in the tested conductor;
the direct current power supply supplies power to the parallel circuit;
the direct current voltage testing device and the direct current testing device respectively test direct current voltage and direct current in the parallel circuit.
The AC path device satisfies: the impedance of the alternating current access device is not greater than the impedance corresponding to the alternating current induction peak voltage of the detected conductor;
the direct current power supply satisfies: the maximum direct current voltage output by the direct current power supply is larger than the alternating current induction peak voltage of the detected conductor.
The ac path means is a capacitor.
The device for testing the direct current resistance of the electromagnetic coupling induced potential conductor comprises a direct current voltage testing device, a direct current power supply, an alternating current inhibiting device and an alternating current access device;
the alternating current suppression device is connected with the tested conductor in series and used for suppressing alternating current in the tested conductor;
the alternating current access device is connected with the series circuit in parallel and used for providing access to alternating current in a tested conductor;
the direct current power supply supplies power to a hybrid circuit formed by the alternating current suppression device, the tested conductor and the alternating current access device;
the direct current voltage testing device and the direct current testing device respectively test the direct current voltage and the direct current in the hybrid circuit.
The alternating current suppression device and the alternating current path device are matched with the direct current power supply;
the direct current power supply satisfies:
wherein, VOutput of、VPeak(s)、ZSuppression of、ZViasThe maximum direct current voltage output by the direct current power supply, the alternating current induction peak voltage of the detected conductor, the impedance of the alternating current suppression device and the impedance of the alternating current access device are respectively;
the alternating current suppression device is an inductor or a resistor; the ac path means is a capacitor.
A method of testing the direct current resistance of a conductor carrying an electromagnetically coupled induced potential, comprising,
connecting the tested conductor with a device for testing the direct current resistance of the conductor bearing the electromagnetic coupling induction potential;
and controlling a direct current power supply to supply power, acquiring direct current voltage measured by the direct current voltage testing device and direct current measured by the direct current testing device, and calculating the direct current resistance of the tested conductor by using the ohm law.
The invention achieves the following beneficial effects: the invention is provided with the alternating current inhibiting device for inhibiting the alternating current of the tested conductor and/or the alternating current passage device for providing a passage for the alternating current of the tested conductor, the tested conductor does not need to be changed into a passive state, and the direct current resistance test can be carried out, so that the direct current resistance test of the conductor with the electromagnetic coupling induced potential is realized, and the test efficiency is high.
Drawings
FIG. 1 is a schematic diagram of an AC potential conductor including electromagnetic coupling;
FIG. 2 is a schematic diagram of an equivalent circuit including electromagnetic coupling AC potentials;
FIG. 3 is a first embodiment of the apparatus of the present invention;
FIG. 4 is a second embodiment of the apparatus of the present invention;
fig. 5 shows a third embodiment of the device according to the invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, the equivalent circuit of a common conductor containing electromagnetic coupling alternating current potential, specifically a conductor containing electromagnetic coupling alternating current potential, is as shown in fig. 2, in order to implement a direct current resistance test of a conductor with electromagnetic coupling induced potential, a conventional test method is improved, and an alternating current suppression device and/or an alternating current path device are/is added in a test circuit; the alternating current suppression device is used for suppressing alternating current in a conductor to be detected, and the alternating current access device is used for providing access to the alternating current in the conductor to be detected; the concrete structure is as follows:
as shown in fig. 3, the apparatus for testing the dc resistance of a conductor carrying an electromagnetically coupled induced potential comprises a dc voltage testing apparatus, a dc current testing apparatus, a dc power supply and an ac suppressing apparatus. The alternating current suppression device is connected with the tested conductor in series and used for suppressing alternating current in the tested conductor; the direct current power supply supplies power to the series circuit; the direct current voltage testing device and the direct current testing device respectively test the direct current voltage and the direct current in the series circuit.
The alternating current suppression device is an inductor or a resistor, is directly connected with the detected conductor in series, and is required to have impedance not less than impedance corresponding to alternating current induction peak voltage of the detected conductor, namely not less than the alternating current induction peak voltage of the detected conductor divided by 100A.
The direct current power supply satisfies:
wherein IOutput of、VPeak(s)、ZSuppression of、ZStraight insideThe maximum direct current output by the direct current power supply, the alternating current induction peak voltage of the detected conductor, the impedance of the alternating current suppression device and the internal impedance value of the direct current power supply are respectively.
The specific test process of the device is as follows:
1) connecting the tested conductor with the device, wherein the impedance of the inductor or the resistor in the device is not less than the AC induction peak voltage of the tested conductor divided by 100A, and the DC power supply satisfies the requirement
2) Controlling the current output by the DC power supply to be greater than
3) And acquiring direct current voltage measured by the direct current voltage testing device and direct current measured by the direct current testing device, and calculating the direct current resistance of the tested conductor by using ohm's law.
As shown in fig. 4, the apparatus for testing the dc resistance of a conductor carrying an electromagnetically coupled induced potential comprises a dc voltage testing apparatus, a dc current testing apparatus, a dc power supply and an ac path apparatus. The alternating current access device is connected with the tested conductor in parallel and used for providing access to alternating current in the tested conductor; the direct current power supply supplies power to the parallel circuit; the direct current voltage testing device and the direct current testing device respectively test direct current voltage and direct current in the parallel circuit.
The alternating current path device is a capacitor and is connected with the tested conductor in parallel, and the impedance of the alternating current path device is required to be not more than the impedance corresponding to the alternating current induction peak voltage of the tested conductor, namely not more than the alternating current induction peak voltage of the tested conductor divided by 0.01A. The maximum direct current voltage output by the direct current power supply is required to be larger than the alternating current induction peak voltage of the detected conductor.
The specific test process of the device is as follows:
1) connecting the tested conductor with the device, wherein the impedance of the capacitor in the device is not less than the AC induction peak voltage of the tested conductor divided by 0.01A, and the DC power supply satisfies the following conditions: the output maximum direct current voltage is greater than the alternating current induction peak voltage of the detected conductor;
2) controlling the current output by the direct current power supply to be larger than the alternating current induction peak voltage of the detected conductor;
3) and acquiring direct current voltage measured by the direct current voltage testing device and direct current measured by the direct current testing device, and calculating the direct current resistance of the tested conductor by using ohm's law.
As shown in fig. 5, the apparatus for testing the dc resistance of a conductor carrying an electromagnetically coupled induced potential includes a dc voltage testing apparatus, a dc current testing apparatus, a dc power supply, an ac suppressing apparatus, and an ac path apparatus. The alternating current suppression device is connected with the tested conductor in series and used for suppressing alternating current in the tested conductor; the alternating current access device is connected with the series circuit in parallel and used for providing access to alternating current in a tested conductor; the direct current power supply supplies power to a hybrid circuit formed by the alternating current suppression device, the tested conductor and the alternating current access device; the direct current voltage testing device and the direct current testing device respectively test the direct current voltage and the direct current in the hybrid circuit.
The alternating current suppression device is an inductor or a resistor, and the alternating current path device is a capacitor; the maximum direct current output voltage of the direct current power supply is not less than 0.1mV, and the maximum direct current output current is not less than 0.1 mA.
The inductor or the resistor and the capacitor need to be matched with the direct current power supply, so that the direct current power supply can meet the following requirements:
The specific test process of the device is as follows:
1) connecting the conductor to be tested with the device, wherein the maximum DC output voltage of the DC power supply in the device is not smallThe maximum direct current output current is not less than 0.1mA at 0.1 mV; the inductor or the resistor and the capacitor are matched with the direct current power supply, so that the direct current power supply can meet the following requirements:
and
2) controlling the voltage output by the DC power supply to be greater than
3) And acquiring direct current voltage measured by the direct current voltage testing device and direct current measured by the direct current testing device, and calculating the direct current resistance of the tested conductor by using ohm's law.
Adopt the device in FIG. 5 to test high voltage power cable metal sheath conductor, length 500 meters, core current is 1V at metal sheath conductor electromagnetic induction coupling induced voltage, and concrete test process is as follows:
selecting a direct current source with the maximum output voltage of 10V and the maximum output current of 1A, and selecting a resistor of 5 ohms and a capacitor of 100 uF;
and step two, connecting the tested conductors according to the figure 5.
Step three, making the DC output voltage greater than
Specifically outputting 10V;
step four: acquiring direct current voltage measured by a direct current voltage testing device and direct current measured by a direct current testing device, wherein the direct current voltage and the direct current are respectively 10V and 1.9A;
since the inductance of the inductor at the power frequency of 50Hz is 600 pi omega, and the internal resistance of the direct current source is 0 in a limit state, the influence of the electromagnetic induction coupling induction alternating current of the metal sheath conductor on the device is negligible about 5 multiplied by 2V/600 pi omega to 0.003A.
Step five: and (3) obtaining the direct current resistance value of the detected conductor by using ohm's law, namely: 10V/1.9A-5 Ω ═ 0.26 Ω.
The invention is provided with the alternating current inhibiting device for inhibiting the alternating current of the tested conductor and/or the alternating current passage device for providing a passage for the alternating current of the tested conductor, the tested conductor does not need to be changed into a passive state, and the direct current resistance test can be carried out, so that the direct current resistance test of the conductor with the electromagnetic coupling induced potential is realized, and the test efficiency is high.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. Device for testing direct current resistance of a conductor bearing electromagnetic coupling induced potential, characterized in that: the device comprises a direct current voltage testing device, a direct current power supply and an alternating current inhibiting device;
the alternating current suppression device is connected with the tested conductor in series and used for suppressing alternating current in the tested conductor;
the direct current power supply supplies power to the series circuit;
the direct current voltage testing device and the direct current testing device respectively test the direct current voltage and the direct current in the series circuit.
2. The apparatus for testing the direct current resistance of an electromagnetically coupled inductive potential conductor of claim 1, wherein:
the AC suppression device satisfies: the impedance of the alternating current suppression device is not less than the impedance corresponding to the alternating current induction peak voltage of the detected conductor;
the direct current power supply satisfies:
wherein IOutput of、VPeak(s)、ZSuppression of、ZStraight insideThe maximum direct current output by the direct current power supply, the alternating current induction peak voltage of the detected conductor, the impedance of the alternating current suppression device and the internal impedance value of the direct current power supply are respectively.
3. An arrangement for testing the direct current resistance of an electromagnetically coupled inductive potential conductor as claimed in claim 1 or 2, characterized in that: the alternating current suppression device is an inductor or a resistor.
4. Device for testing direct current resistance of a conductor bearing electromagnetic coupling induced potential, characterized in that: the device comprises a direct current voltage testing device, a direct current power supply and an alternating current access device;
the alternating current access device is connected with the tested conductor in parallel and used for providing access to alternating current in the tested conductor;
the direct current power supply supplies power to the parallel circuit;
the direct current voltage testing device and the direct current testing device respectively test direct current voltage and direct current in the parallel circuit.
5. An apparatus for testing the direct current resistance of an electromagnetically coupled inductive potential conductor as claimed in claim 4, wherein:
the AC path device satisfies: the impedance of the alternating current access device is not greater than the impedance corresponding to the alternating current induction peak voltage of the detected conductor;
the direct current power supply satisfies: the maximum direct current voltage output by the direct current power supply is larger than the alternating current induction peak voltage of the detected conductor.
6. An apparatus for testing the direct current resistance of an electromagnetically coupled inductive potential conductor as claimed in claim 4 or 5, wherein: the ac path means is a capacitor.
7. Device for testing direct current resistance of a conductor bearing electromagnetic coupling induced potential, characterized in that: the device comprises a direct current voltage testing device, a direct current power supply, an alternating current restraining device and an alternating current access device;
the alternating current suppression device is connected with the tested conductor in series and used for suppressing alternating current in the tested conductor;
the alternating current access device is connected with the series circuit in parallel and used for providing access to alternating current in a tested conductor;
the direct current power supply supplies power to a hybrid circuit formed by the alternating current suppression device, the tested conductor and the alternating current access device;
the direct current voltage testing device and the direct current testing device respectively test the direct current voltage and the direct current in the hybrid circuit.
8. The apparatus for testing the direct current resistance of an electromagnetically coupled inductive potential conductor of claim 7, wherein:
the alternating current suppression device and the alternating current path device are matched with the direct current power supply;
the direct current power supply satisfies:
wherein, VOutput of、VPeak(s)、ZSuppression of、ZViasThe maximum direct current voltage output by the direct current power supply, the alternating current induction peak voltage of the detected conductor, the impedance of the alternating current suppression device and the impedance of the alternating current access device are respectively;
9. an apparatus for testing the direct current resistance of an electromagnetically coupled inductive potential conductor as claimed in claim 7 or 8, wherein: the alternating current suppression device is an inductor or a resistor; the ac path means is a capacitor.
10. The method for testing the direct current resistance of the conductor bearing the electromagnetic coupling induction potential is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
connecting a conductor to be tested to the device of any one of claims 1 to 3, the device of any one of claims 4 to 6 or the device of any one of claims 7 to 9;
and controlling a direct current power supply to supply power, acquiring direct current voltage measured by the direct current voltage testing device and direct current measured by the direct current testing device, and calculating the direct current resistance of the tested conductor by using the ohm law.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011266978.4A CN112578185A (en) | 2020-11-13 | 2020-11-13 | Device and method for testing direct current resistance of conductor bearing electromagnetic coupling induced potential |
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| CN202011266978.4A CN112578185A (en) | 2020-11-13 | 2020-11-13 | Device and method for testing direct current resistance of conductor bearing electromagnetic coupling induced potential |
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2020
- 2020-11-13 CN CN202011266978.4A patent/CN112578185A/en active Pending
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