CN115932406A - Device and method for measuring impedance of grounding device - Google Patents
Device and method for measuring impedance of grounding device Download PDFInfo
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- CN115932406A CN115932406A CN202211441535.3A CN202211441535A CN115932406A CN 115932406 A CN115932406 A CN 115932406A CN 202211441535 A CN202211441535 A CN 202211441535A CN 115932406 A CN115932406 A CN 115932406A
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Abstract
The invention discloses a device and a method for measuring impedance of a grounding device. The device comprises a signal generator, an adjustable impedance, a grounding device impedance matching setting module, a signal output module and a signal processing module; the signal generator is electrically connected with the grounding device impedance matching setting module through adjustable impedance, and the matching setting module is electrically connected with the signal receiving module; the signal generator is used for generating an input electromagnetic wave signal with a preset frequency to an adjustable impedance; the signal receiving module is used for outputting an output electromagnetic wave signal with preset frequency when the adjustable impedance is matched with the impedance of the grounding device impedance matching setting module; the signal processing module is used for determining the capacitance component of the grounding device to be tested according to the preset frequency and the adjustable impedance; and determining the resistance component of the grounding device to be tested according to the amplitude of the input electromagnetic wave signal, the amplitude of the output electromagnetic wave signal and the adjustable impedance. According to the scheme, whether the grounding device is qualified or not is accurately reflected, the safety risk is lower, and meanwhile the detection efficiency is high.
Description
Technical Field
The embodiment of the invention relates to a grounding technology, in particular to a device and a method for measuring impedance of a grounding device.
Background
For electrical equipment, in particular high voltage equipment, one or more sets of qualified and reliable grounding devices are required to ensure safe and reliable operation of the equipment, the grounding is divided into working grounding and protective grounding, and different grounding applications have different requirements on the electrical characteristics of the grounding device, and usually show special requirements on the grounding resistance of the grounding device.
The ground resistance is a resistance encountered when a current flows from a ground device to the ground and then flows to another ground device through the ground or spreads to a remote place, and includes resistances of the ground line and the ground device themselves, a contact resistance between the ground device and the ground resistance, and a resistance of the ground between the two ground devices or a resistance of the ground device to the ground at an infinite distance. In short, the grounding resistance of the grounding device directly represents the good degree of contact between the electrical equipment and the ground. The purpose of measuring whether the grounding device is well grounded is to ensure the safe and reliable operation of the electrical equipment. If the grounding device is not qualified, the grounding device may be electrified, which may cause an electric shock risk. Even equipment damage caused by the change of the running state of the electrical equipment in running.
According to the fact that whether the measured electrical equipment meets the multi-point grounding requirement or not, three-wire method and double-clamp measurement are mainly adopted in actual work. The double clamp measurement is basically satisfactory for the measurement of the earth resistance of everyday earthing devices, but it must be required that the electrical device to be measured is earthed in multiple points and that the inside of the clamp meter must remain out of contact with the earthing device to be measured, otherwise new interferences are introduced. And the fluctuation of the value is large, which part of the grounding device is unqualified can not be accurately reflected. The three-wire method needs to disconnect the grounding device from the electrical equipment, only the grounding device is measured, and the actual working scene can not be met frequently, particularly the high-voltage equipment can not disconnect the grounding part of the equipment under the condition of equipment operation.
Disclosure of Invention
The invention provides a device and a method for measuring impedance of a grounding device, which are used for accurately reflecting whether the grounding device is qualified or not, and have the advantages of low safety risk and high detection efficiency.
In a first aspect, an embodiment of the present invention provides an impedance measuring apparatus for a grounding device, where the apparatus includes a signal generator, an adjustable impedance, a grounding device impedance matching setting module, a signal receiving module, and a signal processing module;
the signal generator is electrically connected with the grounding device impedance matching setting module through the adjustable impedance, and the grounding device impedance matching setting module is electrically connected with the signal receiving module;
the signal generator is used for generating an input electromagnetic wave signal with a preset frequency to the adjustable impedance;
the signal output module is used for outputting the output electromagnetic wave signal with the preset frequency when the adjustable impedance is matched with the impedance of the grounding device impedance matching setting module;
the signal processing module is respectively electrically connected with the signal generator and the signal receiving module and is used for determining the capacitance component of the grounding device to be tested according to the preset frequency and the adjustable impedance; and determining the resistance component of the grounding device to be tested according to the amplitude of the input electromagnetic wave signal, the amplitude of the output electromagnetic wave signal and the adjustable impedance.
Optionally, the grounding device impedance matching setting module comprises a probe contact device;
the probe contact device comprises a first probe contact point, a second probe contact point and a third probe contact point;
the first probe contact point is electrically connected with the first end of the grounding device to be tested; the second probe contact point is electrically connected with the second end of the grounding device to be tested; the third probe contact point is electrically connected with the ground accessory.
Optionally, the grounding device impedance matching setting module includes a grounding device resistance equivalent unit and a grounding device capacitance equivalent unit;
the resistance parameter of the grounding device resistance equivalent unit is the same as that of the grounding device to be tested; and the capacitance parameter of the equivalent resistance unit of the grounding device is the same as that of the grounding device to be tested.
Optionally, the adjustable impedance includes a standard resistor and an adjustable inductor; the standard resistor is electrically connected with the adjustable inductor;
the signal processing module is specifically configured to determine a capacitance component of the grounding device to be tested according to the preset frequency and the adjustable inductance when the adjustable impedance is matched with the impedance of the grounding device to be tested impedance matching module; and determining the resistance component of the grounding device to be tested according to the amplitude of the electromagnetic wave signal with the preset frequency, the amplitude of the electromagnetic wave signal with the preset frequency generated by the signal generator and the standard resistor.
Optionally, the adjustable inductor includes at least one adjustable inductor unit, and each of the adjustable inductor units is electrically connected in parallel;
the adjustable inductor subunit comprises an inductor subunit and an adjustable switch; the inductor sub-unit is electrically connected in series with the adjustable switch.
In a second aspect, an embodiment of the present invention provides a method for measuring impedance of a grounding device, which is applied to the method for measuring impedance of a grounding device in the first aspect, and the method includes:
the signal generator generates an input electromagnetic wave signal with a preset frequency to the adjustable impedance;
when the adjustable impedance is matched with the impedance of the grounding device impedance matching setting module, the signal output module outputs the output electromagnetic wave signal with the preset frequency;
the signal processing module determines a capacitance component of the grounding device to be tested according to the preset frequency and the adjustable impedance and determines a resistance component of the grounding device to be tested according to the amplitude of the input electromagnetic wave signal, the amplitude of the output electromagnetic wave signal and the adjustable impedance.
Optionally, the adjustable impedance includes a standard resistor and an adjustable inductor;
the signal processing module determines the capacitance component of the grounding device to be tested according to the preset frequency and the adjustable impedance, and the signal processing module comprises the following steps:
the signal processing module determines the capacitance component of the grounding device to be tested according to the preset frequency and the adjustable inductor;
the signal processing module determines the resistance component of the grounding device to be tested according to the amplitude of the input electromagnetic wave signal, the amplitude of the output electromagnetic wave signal and the adjustable impedance, and comprises the following steps:
and the signal processing module determines the resistance component of the grounding device to be tested according to the amplitude of the input electromagnetic wave signal, the amplitude of the output electromagnetic wave signal and the standard resistance.
Optionally, the signal processing module determines the capacitance component of the grounding device to be tested according to the preset frequency and the adjustable inductor, and specifically includes:
wherein w is the preset frequency; lt inductance value of the adjustable inductor; and C1 is the capacitance component of the grounding device to be tested.
Optionally, the signal processing module determines the resistance component of the grounding device to be tested according to the amplitude of the input electromagnetic wave signal, the amplitude of the output electromagnetic wave signal, and the adjustable impedance, and specifically includes:
wherein V' is the amplitude of the output electromagnetic wave signal; v is the amplitude of the input electromagnetic wave signal; r1 is the standard resistor, and R is the resistance component of the grounding device to be tested.
Optionally, the method further includes:
and judging whether the grounding device is qualified or not according to the resistance component and the capacitance component.
According to the embodiment of the invention, the signal generator is used for generating an input electromagnetic wave signal with a preset frequency to an adjustable impedance; when the adjustable impedance is matched with the impedance of the grounding device impedance matching setting module, the signal output module outputs the output electromagnetic wave signal with the preset frequency; the signal processing module determines a capacitance component of the grounding device to be tested according to the preset frequency and the adjustable impedance; and determining the resistance component of the grounding device to be detected according to the amplitude of the input electromagnetic wave signal, the amplitude of the output electromagnetic wave signal and the adjustable impedance, so that the scheme accurately reflects whether the grounding device is qualified or not according to the resistance component and the capacitance component of the grounding device to be detected, the safety risk is low, and the detection efficiency is high.
Drawings
Fig. 1 is a schematic structural diagram of an impedance measuring apparatus for a grounding device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another impedance measuring device for a grounding device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another impedance measuring device for a grounding device according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of another method for measuring impedance of a grounding device according to an embodiment of the present invention;
fig. 5 is a schematic flowchart of another method for measuring impedance of a grounding device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of an impedance measuring apparatus for a grounding device according to an embodiment of the present invention, as shown in fig. 1, the apparatus includes a signal generator 10, an adjustable impedance 20, a grounding device impedance matching module 30, a signal output module 40, and a signal processing module 50; the signal generator 10 is electrically connected with the grounding device impedance matching module 30 through the adjustable impedance 20, and the grounding device impedance matching module 30 is electrically connected with the signal output module 40; a signal generator 10 for generating an input electromagnetic wave signal of a predetermined frequency to an adjustable impedance 20; a signal output module 40, configured to output an output electromagnetic wave signal with a preset frequency when the adjustable impedance 20 is impedance-matched with the grounding device impedance matching module 30; the signal processing module 50 is electrically connected to the signal generator 10 and the signal output module 40, and is configured to determine a capacitance component of the grounding device to be tested according to a preset frequency and the adjustable impedance 20; and determining the resistance component of the grounding device to be tested according to the amplitude of the input electromagnetic wave signal, the amplitude of the output electromagnetic wave signal and the adjustable impedance.
The grounding device to be tested is a device for providing good contact with the ground for high-voltage electrical equipment, and a working equivalent physical model of the grounding device is an impedance mode formed by a grounding device resistor and a grounding soil capacitor; in the scheme, the grounding device impedance matching module 30 is a module matched with an actual grounding device impedance mode, and can be an RC loop formed by a resistor and a capacitor, or a resistor socket and a capacitor socket which are directly and electrically connected with a device to be tested; the adjustable impedance 20 may be an RL circuit composed of a resistor and an inductor; the tunable impedance 20 and the grounding device impedance matching module 30 form an RLC series circuit, i.e., the tunable impedance 20 and the grounding device impedance matching module 30 form a band-pass filter.
The scheme utilizes the resonance working principle of the band-pass filter, namely the size of the adjustable impedance 20 is changed, so that the RLC series loop resonates, and the adjustable impedance 20 is in impedance matching with the grounding device impedance matching module 30; when the adjustable impedance 20 is matched with the impedance matching module 30 of the grounding device, the signal output module 40 outputs an output electromagnetic wave signal with a preset frequency, and the signal processing module 50 determines a capacitance component of the grounding device to be tested according to the preset frequency and the adjustable impedance 20; and the resistance component of the grounding device to be tested is determined according to the amplitude of the electromagnetic wave signal output by the signal output module 40, the amplitude of the input electromagnetic wave signal and the adjustable impedance 20, so that whether the grounding device is qualified or not can be accurately reflected by further the resistance component and the capacitance component of the grounding device to be tested, the safety risk is low, and the detection efficiency is high.
Optionally, on the basis of the foregoing embodiment, further refinement is performed, and fig. 2 is a schematic structural diagram of another impedance measuring apparatus for a grounding device provided in the embodiment of the present invention, and as shown in fig. 2, the grounding device impedance matching setting module 30 includes a probe contact device; the probe contact means includes a first probe contact point 31, a second probe contact point 32 and a third probe contact point 33; a first probe contact point 31 electrically connected to a first end of the ground device to be tested; a second probe contact point 32 electrically connected to a second end of the ground device to be tested; and a third probe contact point 33 electrically connected to the ground accessory.
When the impedance of the grounding device to be detected is actually detected, the first probe contact point is electrically connected with the first end of the grounding device to be detected; the second end of the second probe contact point to-be-tested grounding device is electrically connected; the third probe contact point is electrically connected with the ground accessory, the probe contact device is used for contacting the grounding device to be tested (the probe contact device is used for contacting the grounding device to be tested, namely the probe contact device can be equivalent to a resistance component R of the grounding device to be tested and a capacitance component C1 of the grounding device to be tested, and a connection relation diagram of a specific equivalent model is also shown in figure 2), so that in the process of accurately detecting the impedance of the grounding device to be tested, high-voltage electrical equipment does not need to be disconnected, and the safe operation of the high-voltage electrical equipment is ensured.
Optionally, fig. 3 is a schematic structural diagram of another impedance measuring apparatus for a grounding device according to an embodiment of the present invention, and as shown in fig. 3, the impedance matching setting module 30 for a grounding device includes a resistance equivalent unit R of a grounding device and a capacitance equivalent unit C1 of a grounding device; the resistance parameter of the equivalent resistance unit R of the grounding device is the same as that of the grounding device to be tested; the capacitance parameter of the equivalent resistance unit C1 of the grounding device is the same as that of the grounding device to be tested.
In other embodiments, the sensor may be used to detect the resistance parameter of the grounding device to be detected and the capacitance parameter of the grounding device to be detected, select the resistance unit equivalent to the resistance parameter of the grounding device to be detected as the grounding device resistance equivalent unit R, and select the capacitance unit equivalent to the capacitance parameter of the grounding device to be detected as the grounding device capacitance equivalent unit C1.
Optionally, with continued reference to fig. 2 and 3, the adjustable impedance 20 includes a standard resistor R1 and an adjustable inductor Lt; the standard resistor R1 is electrically connected with the adjustable inductor Lt; the signal output module 40 is specifically configured to determine a capacitance component of the grounding device to be tested according to the preset frequency and the adjustable inductance Lt when the adjustable impedance is matched with the impedance of the grounding device impedance matching module; and determining the resistance component of the grounding device to be tested according to the amplitude of the output electromagnetic wave signal, the amplitude of the input electromagnetic wave signal and the standard resistor R1.
Specifically, the RLC band-pass filter is composed of a standard resistor R1, an adjustable inductor Lt and a grounding device impedance matching module 30, and the equivalent impedance of the RLC band-pass filter is as follows:
when the adjustable inductance Lt is adjusted and the adjustable inductance Lt is impedance-matched with the grounding device impedance matching module 30 and the RLC band-pass filter resonates, the RLC band-pass filter exhibits a resistive characteristic, that is, the variable inductance Lt is impedance-matched with the grounding device impedance matching module
The angular frequency w at which resonance occurs is: />
Therefore, the capacitance component C1 of the grounding device to be tested can be determined as follows: c1= 1/(w ^2 Lt); the signal processing module may determine the capacitance component C1 of the grounding device to be tested according to the preset frequency w and the adjustable inductance Lt.
After the adjustable inductor Lt is matched with the impedance of the impedance matching module of the grounding device, the RLC band-pass filter has the resistive characteristic, and the equivalent impedance of the RLC band-pass filter is as follows:
E eq＝ R1+R
the signal processing module determines the resistance component R of the grounding device to be tested according to the amplitude V' of the electromagnetic wave signal output by the signal output module 40, the amplitude V of the input electromagnetic wave signal, and the standard resistor R1, which specifically includes:
wherein V' is the amplitude of the input electromagnetic wave signal; v is the amplitude of the output electromagnetic wave signal; r1 is a standard resistor, and R is a resistance component of the grounding device to be tested.
Optionally, referring to fig. 2 and 3, the adjustable inductor Lt includes at least one adjustable inductor unit, and each adjustable inductor unit is electrically connected in parallel; the adjustable inductor subunit comprises an inductor subunit and an adjustable switch; the inductor subunit is electrically connected in series with the adjustable switch.
In the actual adjustment of the adjustable inductance Lt, the size of the adjustable inductance Lt can be adjusted by adjusting the number of the adjustable switches, so that the adjustable inductance Lt is in impedance matching with the grounding device impedance matching module, and the RLC band-pass filter resonates.
Based on the same inventive concept, an embodiment of the present invention further provides a flow chart of a method for measuring impedance of a grounding device, and fig. 4 is a flow chart of a method for measuring impedance of a grounding device, which is provided by the present invention, as shown in fig. 4, the method includes the following steps:
s110, the signal generator generates an input electromagnetic wave signal with a preset frequency to an adjustable impedance.
The method is applied to the device for measuring the impedance of the grounding device in the above embodiment, and referring to fig. 1, the device includes a signal generator 10, an adjustable impedance 20, a grounding device impedance matching module 30, a signal output module 40, and a signal processing module 50; the signal generator 10 can generate an input electromagnetic wave signal with a preset frequency to an adjustable impedance; the tunable impedance 20 and the ground impedance matching module 30 form a bandpass filter.
And S120, when the adjustable impedance is matched with the impedance matching setting module of the grounding device, the signal output module outputs an output electromagnetic wave signal with a preset frequency.
S130, the signal processing module determines a capacitance component of the grounding device to be tested according to the preset frequency and the adjustable impedance and determines a resistance component of the grounding device to be tested according to the amplitude of the output electromagnetic wave signal, the amplitude of the input electromagnetic wave signal and the adjustable impedance.
The resonance working principle of the band-pass filter is utilized, the impedance of the grounding device is accurately measured by changing the size of the adjustable impedance, the safety risk is low, and meanwhile the detection efficiency is high.
Optionally, on the basis of the foregoing embodiment, the adjustable impedance may include a standard resistor and an adjustable inductor; further, the resistive component and the capacitive component in the grounding device to be tested are determined to be refined, fig. 5 is a schematic flow chart of another method for measuring the impedance of the grounding device according to the embodiment of the present invention, as shown in fig. 5, the method includes the following steps:
s210, the signal generator generates an input electromagnetic wave signal with a preset frequency to an adjustable impedance.
And S220, when the adjustable impedance is matched with the impedance matching setting module of the grounding device, the signal output module outputs an output electromagnetic wave signal with preset frequency.
S230, the signal processing module determines a capacitance component of the grounding device to be tested according to the preset frequency and the adjustable inductance; and determining the resistance component of the grounding device to be tested according to the amplitude of the output electromagnetic wave signal, the amplitude of the input electromagnetic wave signal and the standard resistance.
Specifically, the standard resistor R1, the adjustable inductor Lt and the grounding device impedance matching module 30 form an RLC band-pass filter, the adjustable inductor Lt is adjusted, the adjustable inductor Lt is in impedance matching with the grounding device impedance matching module 30, and when the RLC band-pass filter resonates, the signal processing module determines that the capacitance component of the grounding device to be tested is:
wherein w is a preset frequency; lt is the inductance value of the adjustable inductor; c1 is the capacitance component of the grounding device to be tested.
The signal processing module determines that the resistance component of the grounding device to be tested is as follows according to the amplitude of the output electromagnetic wave signal, the amplitude of the input electromagnetic wave signal and the standard resistance:
wherein, V' is the amplitude of the input electromagnetic wave signal; v is the amplitude of the output electromagnetic wave signal; r1 is a standard resistor, and R is a resistance component of the grounding device to be tested.
And S240, judging whether the grounding device is qualified or not according to the resistance component and the capacitance component.
Different high-voltage electrical equipment is subjected to grounding protection through a grounding device; different high-voltage electrical equipment has different requirements on grounding protection, namely different numerical range requirements on resistance components and capacitance components of a grounding device, when the resistance components of the grounding device are larger than a preset resistance, the grounding device is judged to be improper, and specifically, the grounding part of the grounding device is judged to be improper; when the capacitance component of the grounding device is larger than the preset capacitance, judging that the grounding device is not appropriate, and specifically judging that the grounding soil component is not appropriate; or when the impedance reflected by both the resistance component and the capacitance component is larger than the impedance, it is determined that the grounding device is not appropriate.
According to the scheme, the capacitance component of the grounding device to be tested is determined according to the preset frequency and the adjustable inductance; the resistance component of the grounding device to be tested is determined according to the amplitude of the double-output electromagnetic wave signal, the amplitude of the input electromagnetic wave signal and the standard resistance, so that the impedance of the grounding device is accurately measured; and the detection of each part of the grounding device is realized according to the sizes of the resistance component and the capacitance component.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in some detail by the above embodiments, the invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the invention, and the scope of the invention is determined by the scope of the appended claims.
Claims (10)
1. The grounding device impedance measuring device is characterized by comprising a signal generator, an adjustable impedance, a grounding device impedance matching setting module, a signal output module and a signal processing module;
the signal generator is electrically connected with the grounding device impedance matching setting module through the adjustable impedance, and the grounding device impedance matching setting module is electrically connected with the signal receiving module;
the signal generator is used for generating an input electromagnetic wave signal with a preset frequency to the adjustable impedance;
the signal output module is used for outputting the output electromagnetic wave signal with the preset frequency when the adjustable impedance is matched with the impedance of the grounding device impedance matching setting module;
the signal processing module is respectively electrically connected with the signal generator and the signal output module and is used for determining the capacitance component of the grounding device to be tested according to the preset frequency and the adjustable impedance; and determining the resistance component of the grounding device to be tested according to the amplitude of the input electromagnetic wave signal, the amplitude of the output electromagnetic wave signal and the adjustable impedance.
2. The impedance measurement device of claim 1, wherein the grounding means impedance matching setting module comprises a probe contact means;
the probe contact device comprises a first probe contact point, a second probe contact point and a third probe contact point;
the first probe contact point is electrically connected with the first end of the grounding device to be tested; the second probe contact point is electrically connected with the second end of the grounding device to be tested; the third probe contact point is electrically connected with the ground accessory.
3. The impedance measurement device of claim 1, wherein the grounding device impedance matching setting module comprises a grounding device resistance equivalent unit and a grounding device capacitance equivalent unit;
the resistance parameter of the grounding device resistance equivalent unit is the same as that of the grounding device to be tested; and the capacitance parameter of the equivalent resistance unit of the grounding device is the same as that of the grounding device to be tested.
4. The impedance measurement device of claim 1, wherein the adjustable impedance comprises a standard resistance and an adjustable inductance; the standard resistor is electrically connected with the adjustable inductor;
the signal processing module is specifically configured to determine a capacitance component of the grounding device to be tested according to the preset frequency and the adjustable inductor when the adjustable impedance is matched with the impedance of the grounding device to be tested impedance matching module; and determining the resistance component of the grounding device to be tested according to the amplitude of the electromagnetic wave signal with the preset frequency, the amplitude of the electromagnetic wave signal with the preset frequency generated by the signal generator and the standard resistor.
5. The impedance measurement device of claim 4, wherein the adjustable inductor comprises at least one adjustable inductor unit, each of the adjustable inductor units being electrically connected in parallel;
the adjustable inductor subunit comprises an inductor subunit and an adjustable switch; the inductor subunit is electrically connected in series with the adjustable switch.
6. A method for measuring an impedance of a grounding device, which is applied to the method for measuring an impedance of a grounding device according to any one of claims 1 to 5, comprising:
the signal generator generates an input electromagnetic wave signal with a preset frequency to the adjustable impedance;
when the adjustable impedance is matched with the impedance of the grounding device impedance matching setting module, the signal output module outputs the output electromagnetic wave signal with the preset frequency;
the signal processing module determines a capacitance component of the grounding device to be tested according to the preset frequency and the adjustable impedance, and determines a resistance component of the grounding device to be tested according to the amplitude of the input electromagnetic wave signal, the amplitude of the output electromagnetic wave signal and the adjustable impedance.
7. The method of claim 6, wherein the adjustable impedance comprises a standard resistor and an adjustable inductor;
the signal processing module determines the capacitance component of the grounding device to be tested according to the preset frequency and the adjustable impedance, and the determination comprises the following steps:
the signal processing module determines the capacitance component of the grounding device to be tested according to the preset frequency and the adjustable inductor;
the signal processing module determines the resistance component of the grounding device to be tested according to the amplitude of the input electromagnetic wave signal, the amplitude of the output electromagnetic wave signal and the adjustable impedance, and comprises the following steps:
and the signal processing module determines the resistance component of the grounding device to be tested according to the amplitude of the input electromagnetic wave signal, the amplitude of the output electromagnetic wave signal and the standard resistance.
8. The method for measuring the impedance of the grounding device according to claim 7, wherein the signal processing module determines the capacitance component of the grounding device to be measured according to the preset frequency and the adjustable inductance, specifically:
wherein w is the preset frequency; lt inductance value of the adjustable inductor; and C1 is the capacitance component of the grounding device to be tested.
9. The method for measuring the impedance of the grounding device according to claim 7, wherein the signal processing module determines the resistance component of the grounding device to be measured according to the amplitude of the input electromagnetic wave signal, the amplitude of the output electromagnetic wave signal, and the adjustable impedance, specifically:
wherein V' is the amplitude of the output electromagnetic wave signal; v is the amplitude of the input electromagnetic wave signal; r1 is the standard resistor, and R is the resistance component of the grounding device to be tested.
10. The method of measuring impedance of a grounding device of claim 6, further comprising: and judging whether the grounding device is qualified or not according to the resistance component and the capacitance component.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211441535.3A CN115932406A (en) | 2022-11-17 | 2022-11-17 | Device and method for measuring impedance of grounding device |
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| CN202211441535.3A CN115932406A (en) | 2022-11-17 | 2022-11-17 | Device and method for measuring impedance of grounding device |
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| CN202211441535.3A Pending CN115932406A (en) | 2022-11-17 | 2022-11-17 | Device and method for measuring impedance of grounding device |
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