CN115291018A - Frequency response characteristic experiment evaluation method and experiment evaluation system - Google Patents
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Abstract
The embodiment of the application discloses an experimental evaluation method and an experimental evaluation system for frequency response characteristics, which accurately evaluate the frequency response characteristics of a grounding device under multiple impulse voltages and are used for evaluating the performance state of the grounding device in natural lightning. The experimental evaluation method comprises the following steps: controlling a multiple impulse voltage generator to generate multiple impulse voltages by using a control device according to waveform parameters, wherein the waveform parameters are preset by an upper computer; outputting the multiple surge voltages to the grounding device by using the multiple surge voltage injection lead; collecting a current full-time-domain waveform and a voltage full-time-domain waveform generated by a grounding device under multiple impulse voltages by using a data acquisition device; and calculating a frequency response characteristic evaluation factor by using an upper computer according to the current full-time-domain waveform and the voltage full-time-domain waveform, wherein the frequency response characteristic evaluation factor is used for evaluating the frequency response characteristic of the grounding device.
Description
Technical Field
The application relates to the technical field of simulation experiments of grounding devices and grounding of power systems, in particular to an experimental evaluation method and an evaluation system for frequency response characteristics.
Background
The grounding device is an important component of a power transmission system, not only provides a common reference ground for various electrical equipment, but also can rapidly dissipate fault current or lightning current when a fault or lightning stroke occurs, limit the rise of ground potential and ensure the safety of personnel and equipment, so that good grounding is an important condition for ensuring the safe and stable operation of a power system, and the reliability and the safety performance of the grounding device are always highly valued by design and production operation departments. It is therefore of great importance to accurately assess the operating state of the earthing device.
Most of the existing evaluation methods for the pole tower grounding device are based on single lightning stroke, however, the proportion of multiple lightning strokes in natural lightning is as high as more than seven, and the current dissipation amplitude and the current dissipation time of the grounding device under the single lightning stroke are far from the multiple lightning strokes in the nature, so that the grounding device with good characteristics under the single lightning stroke is poor in performance when suffering from the multiple lightning strokes in the nature.
Disclosure of Invention
Therefore, it is necessary to provide an experimental evaluation method and an experimental evaluation system for frequency response characteristics, which accurately evaluate the frequency response characteristics of the grounding device under multiple impulse voltages to evaluate the performance status of the grounding device in natural lightning.
In a first aspect, the present application provides an experimental evaluation method, which is suitable for evaluating a frequency response characteristic of a grounding device under multiple impulse voltages, and includes:
controlling a multiple impulse voltage generator to generate multiple impulse voltages by using a control device according to waveform parameters, wherein the waveform parameters are preset by an upper computer;
outputting the multiple surge voltages to the grounding device by using the multiple surge voltage injection lead;
collecting a current full-time-domain waveform and a voltage full-time-domain waveform generated by a grounding device under multiple impulse voltages by using a data acquisition device;
and calculating a frequency response characteristic evaluation factor by using an upper computer according to the current full-time-domain waveform and the voltage full-time-domain waveform, wherein the frequency response characteristic evaluation factor is used for evaluating the frequency response characteristic of the grounding device.
Optionally, in a possible implementation manner of the first aspect of the present application, the method further includes:
if the value of the frequency response characteristic evaluation factor is greater than 0 and less than or equal to 1, determining that the frequency response characteristic of the grounding device is strong and the state of the grounding device is good;
and if the value of the frequency response characteristic evaluation factor is greater than 1, determining that the frequency response characteristic of the grounding device is weak and the state of the grounding device is poor.
Optionally, in a possible implementation manner of the first aspect of the present application, calculating a frequency response characteristic evaluation factor according to a current full-time waveform and a voltage full-time waveform includes:
carrying out waveform analysis on the current full-time-domain waveform and the voltage full-time-domain waveform, and extracting the impulse voltage repetition number, each single impulse current amplitude and each single impulse current duration;
calculating the multiple impact current equivalent frequency under multiple impact voltages according to the impact voltage multiplicity, each single impact current amplitude and each single impact current duration;
and calculating according to the multiple impact current equivalent frequencies to obtain a frequency response characteristic evaluation factor.
Optionally, in a possible implementation manner of the first aspect of the present application, the calculation formula of the equivalent frequency f of the inrush current is as follows:
wherein f is the multiple impact current equivalent frequency, N is the impact weight, the value of N is an integer larger than 1, ti is the duration of each single impact current, ii is the amplitude of each single impact current, eta is the multiple impact current amplitude correction coefficient, and alpha is the wave head attenuation coefficient and the beta wave tail attenuation coefficient.
5. The experimental evaluation method according to claim 3, characterized in that the frequency response characteristic evaluation factor q is calculated as follows:
wherein q is a frequency response characteristic evaluation factor, f is a multiple impulse current equivalent frequency, rho 0 For low frequency reference to soil resistivity, f 0 For low frequency reference, l is the total length of the grounding device.
Optionally, in a possible implementation manner of the first aspect of the present application, the acquiring, by using a data acquisition device, a full-time waveform of a current and a full-time waveform of a voltage generated by a grounding device under multiple impulse voltages includes:
measuring a current full-time-domain waveform by using a current sensor, and outputting the current full-time-domain waveform to a data acquisition device;
and measuring a voltage full-time-domain waveform between the grounding device and a voltage reference electrode by using a high-voltage differential probe, and outputting the voltage full-time-domain waveform to a data acquisition device, wherein the voltage reference electrode is used for providing a reference voltage.
Optionally, in a possible implementation manner of the first aspect of the present application, the waveform parameters include amplitude, wavefront time, wave tail time, impact interval, and impact weight.
In a second aspect, the present application provides an experimental evaluation system for evaluating a frequency response characteristic of a grounding device under multiple impulse voltages, including:
the device comprises an upper computer, a control device, a multiple impulse voltage generator, a multiple impulse voltage injection lead, a grounding device and a data acquisition device;
the upper computer is connected with the input end of the control device, the output end of the control device is connected with the input end of the multiple impulse voltage generator, the output end of the multiple impulse voltage generator is connected with the grounding device through a multiple impulse voltage injection lead, the input end of the data acquisition device is connected with the multiple impulse voltage injection lead, and the output end of the data acquisition device is connected with the upper computer;
performing the following operations by the evaluation system:
controlling a multiple impulse voltage generator to generate multiple impulse voltages by using a control device according to waveform parameters, wherein the waveform parameters are preset by an upper computer;
outputting the multiple surge voltages to the grounding device by using the multiple surge voltage injection lead;
collecting a current full-time-domain waveform and a voltage full-time-domain waveform generated by a grounding device under multiple impulse voltages by using a data acquisition device;
and calculating a frequency response characteristic evaluation factor by using an upper computer according to the current full-time-domain waveform and the voltage full-time-domain waveform, wherein the frequency response characteristic evaluation factor is used for evaluating the frequency response characteristic of the grounding device.
Optionally, in a possible implementation manner of the first aspect of the present application, the experiment evaluation system further includes:
the device comprises a current sensor, a high-voltage differential probe and a voltage reference electrode, wherein the current sensor is sleeved on a multiple impulse voltage injection lead, and two input terminals of the high-voltage differential probe are respectively connected to a grounding device and the voltage reference electrode;
in the experimental evaluation system, the following operations are specifically performed by collecting and collecting a current full-time-domain waveform and a voltage full-time-domain waveform by using a data collecting device:
measuring a current full-time-domain waveform by using a current sensor, and outputting the current full-time-domain waveform to a data acquisition device;
and measuring a voltage full-time-domain waveform between the grounding device and a voltage reference electrode by using a high-voltage differential probe, and outputting the voltage full-time-domain waveform to a data acquisition device, wherein the voltage reference electrode is used for providing a reference voltage.
Optionally, in a possible implementation manner of the first aspect of the present application, the grounding device includes:
the test round pot is internally filled with fine sand, the grounding electrode is connected to the multiple impulse voltage injection lead and inserted into the fine sand of the test round pot, the voltage reference electrode is also inserted into the fine sand of the test round pot, and the voltage reference electrode and the grounding electrode are separated by the fine sand.
The technical scheme provided by the application has the following beneficial effects at least:
the control device controls multiple impulse voltages to generate multiple impulse voltages according to waveform parameters, the generated multiple impulse voltages are output to the grounding device through the multiple impulse voltage injection lead, the frequency response characteristic evaluation factor is obtained by calculating the current full-time-domain waveform and the voltage full-time-domain waveform generated by the grounding device under the multiple impulse voltages and is used for evaluating the frequency response characteristic of the grounding device, so that the frequency response characteristic of the grounding device under the multiple impulse voltages is evaluated, and the frequency response characteristic evaluation factor is obtained by calculating the current full-time-domain waveform and the voltage full-time-domain waveform generated by the grounding device under the multiple impulse voltages, so that the frequency response characteristic of the grounding device is evaluated through the frequency response characteristic evaluation factor, the accuracy of the grounding device can be effectively improved, and the performance state of the grounding device in natural lightning can be more accurately evaluated.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
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The foregoing and other objects, features and advantages of the application will be apparent from the following more particular descriptions of exemplary embodiments of the application, as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the application.
FIG. 1 is a schematic flow chart of an experimental evaluation method in an embodiment of the present application;
fig. 2 is a schematic structural diagram of an experimental evaluation system in an embodiment of the present application.
Detailed Description
Embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While embodiments of the present application are illustrated in the accompanying drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In order to more accurately evaluate the performance of the grounding device under multiple impacts, the embodiment of the application provides an experimental evaluation method and an experimental evaluation system for frequency response characteristics, and the method and the system are suitable for evaluating the frequency response characteristics of the grounding device under multiple impact voltages. The frequency response characteristic is called frequency response characteristic for short, and refers to the relationship between the amplitude and phase of a signal and the frequency; the frequency response may reflect the signal processing capability of the device or apparatus for different frequency signals.
In order to facilitate understanding of the experimental evaluation method in the present application, the experimental evaluation method in the embodiments of the present application will be described below with reference to the accompanying drawings, specifically as follows:
FIG. 1 is a schematic flow chart of an experimental evaluation method in an embodiment of the present application;
as shown in fig. 1, the experimental evaluation method in the embodiment of the present application includes:
101. and controlling the multiple impulse voltage generator to generate multiple impulse voltages according to the waveform parameters by using the control device.
In the embodiment of the application, the waveform parameters are preset through an upper computer. Optionally, the waveform parameters include amplitude, wavefront time, tail time, impact interval, and impact weight.
The control end of the multiple impulse voltage generator is connected with the upper computer through a control device. After the waveform parameters and the parameter values thereof are determined, the determined waveform parameters and the parameter values thereof are written into a control device by using an upper computer, and the control device is used for controlling the multiple impulse voltage generator. And controlling the multiple impulse voltage generator to generate corresponding multiple impulse voltages by using the control device according to the determined waveform parameters and the parameter values thereof.
102. Multiple surge voltage injection leads are used to output multiple surge voltages to the ground.
In the embodiment of the application, the signal output end of the multiple impulse voltage generator is connected with the grounding device through the multiple impulse voltage injection lead. The multiple impulse voltage generated by the multiple impulse voltage generator is output or injected to the grounding device through the multiple impulse voltage injection lead.
Optionally, in an implementation manner of the embodiment of the present application, the grounding device includes a grounding electrode and a test round pot, wherein the exterior of the test round pot is grounded, the interior of the test round pot is filled with fine sand, the grounding electrode is connected to the multiple impulse voltage injection lead and is inserted into the fine sand of the test round pot, the voltage reference electrode is also inserted into the fine sand of the test round pot, and the voltage reference electrode and the grounding electrode are separated by the fine sand.
103. And acquiring a current full-time-domain waveform and a voltage full-time-domain waveform generated by the grounding device under multiple impulse voltages by using a data acquisition device.
In the embodiment of the application, the grounding device can generate corresponding current and voltage under the impact of multiple impact voltages. The waveform corresponding to the generated current (namely, the current full-time-domain waveform) and the waveform corresponding to the voltage (namely, the voltage full-time-domain waveform) can be acquired by using the data acquisition device.
Optionally, in an implementation manner of the embodiment of the present application, for the current full-time waveform acquisition, a current sensor may be used to measure a current full-time waveform, and the current full-time waveform is output to the data acquisition device;
optionally, in an implementation manner of the embodiment of the present application, for the voltage full-time waveform acquisition, a voltage full-time waveform between the grounding device and a voltage reference electrode for providing a reference voltage may be measured using a high-voltage differential probe, and the voltage full-time waveform may be output to the data acquisition device.
Specifically, an upper computer is used for setting waveform parameters including amplitude, wave front time, wave tail time, impact interval and impact weight, then the upper computer is used for controlling a multiple impact voltage generating device to generate multiple impact voltages, a current sensor is used for measuring the current full time domain waveform of the grounding electrode, and a high-voltage differential probe is used for measuring the voltage full time domain waveform between the grounding electrode and a voltage reference electrode.
104. And calculating a frequency response characteristic evaluation factor by using an upper computer according to the current full-time-domain waveform and the voltage full-time-domain waveform, wherein the frequency response characteristic evaluation factor is used for evaluating the frequency response characteristic of the grounding device.
In this embodiment of the application, calculating the frequency response characteristic evaluation factor according to the current full-time-domain waveform and the voltage full-time-domain waveform may specifically include: firstly, carrying out waveform analysis on a current full-time-domain waveform and a voltage full-time-domain waveform, and extracting impulse voltage multiplicity, each single impulse current amplitude and each single impulse current duration; secondly, calculating the multiple impact current equivalent frequency under multiple impact voltages according to the impact voltage multiplicity, each single impact current amplitude and each single impact current duration; and finally, calculating according to the multiple impact current equivalent frequency to obtain a frequency response characteristic evaluation factor.
Specifically, the waveform of the measured voltage current is analyzed by an upper computer, and characteristic values of the current impact weight N, each single impact current amplitude Ii (i =1, 2, and/or N) and each single impact current duration ti (i =1, 2 and/or N) are extracted.
Optionally, in an implementation manner of the embodiment of the present application, the equivalent frequency f of the inrush current may be calculated by using the following calculation formula:
wherein f is the multiple impact current equivalent frequency, N is the impact weight, the value of N is an integer larger than 1, ti is the duration of each single impact current, ii is the amplitude of each single impact current, eta is the multiple impact current amplitude correction coefficient, and alpha is the wave head attenuation coefficient and the beta wave tail attenuation coefficient.
Specifically, η may be 0.97, and α may be 8.66 × 10 -4 And the value of beta can be 1.732 multiplied by 10 5 。
Optionally, in an implementation manner of the embodiment of the present application, after the equivalent frequency f of the inrush current is obtained through calculation, the frequency response characteristic evaluation factor q is calculated according to the calculated equivalent frequency f of the inrush current, so as to evaluate the frequency response characteristic of the ground device under the current impact weight N. The frequency response characteristic evaluation factor q can be calculated by using the following calculation formula:
wherein q is a frequency response characteristic evaluation factor, f is a multiple impulse current equivalent frequency, rho 0 For low frequency reference soil resistivity, f 0 For the low frequency reference frequency, l is the total length of the grounding device.
Specifically, ρ 0 Can take on values of 100 Ω. M, f 0 The value of (a) may be 50Hz and the value of l may be 60m.
The frequency response characteristic evaluation factor is used for evaluating the frequency response characteristic of the grounding device. Optionally, in an implementation manner of an embodiment of the present application, the experimental evaluation method further includes: if the value of the frequency response characteristic evaluation factor is greater than 0 and less than or equal to 1, determining that the frequency response characteristic of the grounding device is strong and the state of the grounding device is good; and if the value of the frequency response characteristic evaluation factor is greater than 1, determining that the frequency response characteristic of the grounding device is weak and the state of the grounding device is poor.
Specifically, the value range of q is (0, + ∞), and when q ∈ (0,1), the characteristic of the grounding device is strong and the state of the grounding device is good, and when q ∈ (1, + ∞), the characteristic of the grounding device is weak and the state of the grounding device is poor.
In summary, in the experimental evaluation method in the embodiment of the present application, the control device controls the multiple impulse voltages to generate the multiple impulse voltages according to the waveform parameters, the generated multiple impulse voltages are output to the grounding device through the multiple impulse voltage injection lead, the frequency response characteristic evaluation factor is obtained by calculating the current full-time-domain waveform and the voltage full-time-domain waveform generated by the grounding device under the multiple impulse voltages, and the frequency response characteristic evaluation factor is used for evaluating the frequency response characteristic of the grounding device, so that the frequency response characteristic of the grounding device under the multiple impulse voltages is evaluated, and the frequency response characteristic evaluation factor is obtained by calculating the current full-time-domain waveform and the voltage full-time-domain waveform generated by the grounding device under the multiple impulse voltages, so that the frequency response characteristic of the grounding device is evaluated by the frequency response characteristic evaluation factor, and the accuracy of the grounding device can be effectively improved, and the performance state of the grounding device in natural lightning can be more accurately evaluated.
Corresponding to the embodiment of the application function implementation method, the application also provides an experiment evaluation system and a corresponding embodiment.
Fig. 2 is a schematic structural diagram of an experimental evaluation system in an embodiment of the present application.
As shown in fig. 2, the experimental evaluation system in the embodiment of the present application includes:
the device comprises an upper computer 201, a control device 202, a multiple impulse voltage generator 203, a multiple impulse voltage injection lead 204, a grounding device 205 and a data acquisition device 206;
the upper computer 201 is connected with the input end of the control device 202, the output end of the control device 202 is connected with the input end of the multiple impulse voltage generator 203, the output end of the multiple impulse voltage generator 203 is connected with the grounding device 205 through the multiple impulse voltage injection lead 204, the input end of the data acquisition device 206 is connected with the multiple impulse voltage injection lead 205, and the output end of the data acquisition device 206 is connected with the upper computer 201;
performing the following operations by the evaluation system:
the control device 202 is used for controlling the multiple impulse voltage generator 203 to generate multiple impulse voltages according to waveform parameters, wherein the waveform parameters are preset through the upper computer 201;
using the multiple surge voltage injection lead 204 to output multiple surge voltages to the grounding device 205;
acquiring a current full-time-domain waveform and a voltage full-time-domain waveform generated by the grounding device 205 under multiple impulse voltages by using a data acquisition device 206;
and calculating a frequency response characteristic evaluation factor by using the upper computer 201 according to the current full-time-domain waveform and the voltage full-time-domain waveform, wherein the frequency response characteristic evaluation factor is used for evaluating the frequency response characteristic of the grounding device 205.
Optionally, in an implementation manner of the embodiment of the present application, the experiment evaluation system 20 further includes:
the device comprises a current sensor 207, a high-voltage differential probe 208 and a voltage reference electrode 209, wherein the current sensor 207 is sleeved on a multiple impulse voltage injection lead 204, and two input terminals of the high-voltage differential probe 208 are respectively connected to a grounding device 205 and the voltage reference electrode 209;
in the experimental evaluation system, collecting the collected current full-time-domain waveform and the voltage full-time-domain waveform using the data collection device 206 specifically performs the following operations:
measuring a current full-time waveform by using a current sensor 207, and outputting the current full-time waveform to a data acquisition device 206;
the high voltage differential probe 208 is used to measure the full time waveform of the voltage between the ground device 205 and the voltage reference electrode 209, which is used to provide the reference voltage, and output the full time waveform of the voltage to the data acquisition device 206.
Optionally, in an implementation manner of the embodiment of the present application, the grounding device 205 includes:
a ground electrode 2051 and a test round 2052, wherein the exterior of the test round 2052 is grounded, the interior of the test round 2052 is filled with fine sand, the ground electrode 2051 is connected to the multiple surge voltage injection lead 204 and is inserted into the fine sand of the test round 2052, the voltage reference electrode 209 is also inserted into the fine sand of the test round, and the voltage reference electrode 209 and the ground electrode 2051 are separated by the fine sand.
In summary, the experiment evaluation system in the embodiment of the present application may execute the experiment evaluation method in the above method embodiment, so as to evaluate the frequency response characteristic of the grounding device under multiple impulse voltages, and since the frequency response characteristic evaluation factor is calculated based on the current full-time-domain waveform and the voltage full-time-domain waveform generated by the grounding device under multiple impulse voltages, the frequency response characteristic of the grounding device is evaluated by the frequency response characteristic evaluation factor, which can effectively improve the accuracy of the grounding device, thereby more accurately evaluating the performance state of the grounding device in the natural lightning strike.
With regard to the apparatus in the above embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated herein.
Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. An experimental evaluation method, wherein the experimental evaluation method is suitable for evaluating the frequency response characteristics of a grounding device under multiple impulse voltages, and comprises the following steps:
controlling a multiple impulse voltage generator to generate the multiple impulse voltage according to waveform parameters by using a control device, wherein the waveform parameters are preset by an upper computer;
outputting the multiple surge voltages to the grounding device using multiple surge voltage injection leads;
collecting a current full-time-domain waveform and a voltage full-time-domain waveform generated by the grounding device under the multiple impulse voltages by using a data acquisition device;
and calculating a frequency response characteristic evaluation factor by using the upper computer according to the current full time domain waveform and the voltage full time domain waveform, wherein the frequency response characteristic evaluation factor is used for evaluating the frequency response characteristic of the grounding device.
2. The experimental evaluation method of claim 1, further comprising:
if the value of the frequency response characteristic evaluation factor is greater than 0 and less than or equal to 1, determining that the frequency response characteristic of the grounding device is strong and the state of the grounding device is good;
and if the value of the frequency response characteristic evaluation factor is greater than 1, determining that the frequency response characteristic of the grounding device is weak and the state of the grounding device is poor.
3. The experimental evaluation method according to claim 1 or 2, wherein the calculating a frequency response characteristic evaluation factor according to the current full time domain waveform and the voltage full time domain waveform comprises:
carrying out waveform analysis on the current full-time domain waveform and the voltage full-time domain waveform, and extracting the impulse voltage multiplicity, each single impulse current amplitude and each single impulse current duration;
calculating the multiple impact current equivalent frequency under the multiple impact voltages according to the impact voltage multiplicity, each single impact current amplitude and each single impact current duration;
and calculating the frequency response characteristic evaluation factor according to the multiple impact current equivalent frequency.
4. The experimental evaluation method according to claim 3, wherein the impulse current equivalent frequency f is calculated as follows:
wherein f is the equivalent frequency of the multiple impact current, N is the impact weight, the value of N is an integer larger than 1, ti is the duration of each single impact current, ii is the amplitude of each single impact current, eta is the correction coefficient of the amplitude of the multiple impact current, alpha is the wave head attenuation coefficient and beta wave tail attenuation coefficient.
5. The experimental evaluation method according to claim 3, wherein the frequency response characteristic evaluation factor q is calculated as follows:
wherein q is a frequency response characteristic evaluation factor, f is a multiple impulse current equivalent frequency, rho 0 For low frequency reference to soil resistivity, f 0 For low frequency reference, l is the total length of the grounding device.
6. The experimental evaluation method of claim 1, wherein the using a data acquisition device to acquire the full-time waveform of current and the full-time waveform of voltage generated by the grounding device under the multiple impulse voltages comprises:
measuring the current full-time-domain waveform by using a current sensor, and outputting the current full-time-domain waveform to the data acquisition device;
and measuring the voltage full-time-domain waveform between the grounding device and a voltage reference electrode by using a high-voltage differential probe, and outputting the voltage full-time-domain waveform to the data acquisition device, wherein the voltage reference electrode is used for providing reference voltage.
7. The experimental evaluation method of claim 1, wherein the waveform parameters include amplitude, wavefront time, tail time, impact interval, and impact weight.
8. An experiment evaluation system, wherein the experiment evaluation system is adapted to evaluate the frequency response characteristics of a grounding device under multiple impulse voltages, and comprises:
the device comprises an upper computer, a control device, a multiple impulse voltage generator, a multiple impulse voltage injection lead, a grounding device and a data acquisition device;
the upper computer is connected with the input end of the control device, the output end of the control device is connected with the input end of the multiple impulse voltage generator, the output end of the multiple impulse voltage generator is connected with the grounding device through the multiple impulse voltage injection lead, the input end of the data acquisition device is connected with the multiple impulse voltage injection lead, and the output end of the data acquisition device is connected with the upper computer;
performing, by the evaluation system:
controlling the multiple impulse voltage generator to generate the multiple impulse voltages according to waveform parameters by using the control device, wherein the waveform parameters are preset by the upper computer;
outputting the multiple surge voltages to the grounding device using the multiple surge voltage injection lead;
collecting a current full-time-domain waveform and a voltage full-time-domain waveform generated by the grounding device under the multiple impulse voltages by using a data acquisition device;
and calculating a frequency response characteristic evaluation factor by using the upper computer according to the current full time domain waveform and the voltage full time domain waveform, wherein the frequency response characteristic evaluation factor is used for evaluating the frequency response characteristic of the grounding device.
9. The evaluation system of claim 8, further comprising:
the current sensor is sleeved on the multiple impulse voltage injection lead, and two input terminals of the high-voltage differential probe are respectively connected to the grounding device and the voltage reference electrode;
in the evaluation system, the collecting of the current full-time-domain waveform and the voltage full-time-domain waveform by the collecting device specifically performs the following operations:
measuring the current full-time-domain waveform by using the current sensor, and outputting the current full-time-domain waveform to the data acquisition device;
and measuring the voltage full-time-domain waveform between the grounding device and the voltage reference electrode by using the high-voltage differential probe, and outputting the voltage full-time-domain waveform to the data acquisition device, wherein the voltage reference electrode is used for providing reference voltage.
10. The experimental evaluation system of claim 9, wherein the grounding means comprises:
the test round pot comprises a grounding electrode and a test round pot, wherein the outside of the test round pot is grounded, fine sand is filled in the test round pot, the grounding electrode is connected to the multiple impulse voltage injection lead and inserted into the fine sand of the test round pot, the voltage reference electrode is also inserted into the fine sand of the test round pot, and the voltage reference electrode and the grounding electrode are separated by the fine sand.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050229053A1 (en) * | 2003-07-25 | 2005-10-13 | Logicvision, Inc., 101 Metro Drive, 3Rd Floor, San Jose, Ca, 95110 | Circuit and method for low frequency testing of high frequency signal waveforms |
| CN102081136A (en) * | 2010-12-01 | 2011-06-01 | 西安交通大学 | Method for on-site GIS (Gas-insulated metal-enclosed switchgear) partial discharge detection under impulse voltage |
| CN106482638A (en) * | 2016-10-17 | 2017-03-08 | 南京航空航天大学 | Method for position is sentenced based on the impact that full frequency band signal amplitude energy and inverse function solve |
| CN107607837A (en) * | 2017-08-18 | 2018-01-19 | 四川大学 | A kind of cable insulation degree of aging method of testing and device based on surge voltage |
| US20190157015A1 (en) * | 2016-04-27 | 2019-05-23 | The Regents Of The University Of California | Rf-powered micromechanical clock generator |
| CN110308351A (en) * | 2019-07-12 | 2019-10-08 | 国网江苏省电力有限公司电力科学研究院 | Grounded screen frequency response measurement system and method based on short-term transients time domain measurement |
| CN111510230A (en) * | 2020-04-16 | 2020-08-07 | 河套学院 | Lightning electromagnetic pulse damage effect determination method for airborne VHF communication radio station |
| CN112924772A (en) * | 2021-01-20 | 2021-06-08 | 云南电网有限责任公司电力科学研究院 | Lightning arrester aging evaluation system and method under multi-pulse influence of humid environment |
| CN114184905A (en) * | 2021-11-08 | 2022-03-15 | 西南交通大学 | XLPE cable insulation water tree aging state evaluation method based on current migration coefficient |
-
2022
- 2022-08-11 CN CN202210963330.5A patent/CN115291018B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050229053A1 (en) * | 2003-07-25 | 2005-10-13 | Logicvision, Inc., 101 Metro Drive, 3Rd Floor, San Jose, Ca, 95110 | Circuit and method for low frequency testing of high frequency signal waveforms |
| CN102081136A (en) * | 2010-12-01 | 2011-06-01 | 西安交通大学 | Method for on-site GIS (Gas-insulated metal-enclosed switchgear) partial discharge detection under impulse voltage |
| US20190157015A1 (en) * | 2016-04-27 | 2019-05-23 | The Regents Of The University Of California | Rf-powered micromechanical clock generator |
| CN106482638A (en) * | 2016-10-17 | 2017-03-08 | 南京航空航天大学 | Method for position is sentenced based on the impact that full frequency band signal amplitude energy and inverse function solve |
| CN107607837A (en) * | 2017-08-18 | 2018-01-19 | 四川大学 | A kind of cable insulation degree of aging method of testing and device based on surge voltage |
| CN110308351A (en) * | 2019-07-12 | 2019-10-08 | 国网江苏省电力有限公司电力科学研究院 | Grounded screen frequency response measurement system and method based on short-term transients time domain measurement |
| CN111510230A (en) * | 2020-04-16 | 2020-08-07 | 河套学院 | Lightning electromagnetic pulse damage effect determination method for airborne VHF communication radio station |
| CN112924772A (en) * | 2021-01-20 | 2021-06-08 | 云南电网有限责任公司电力科学研究院 | Lightning arrester aging evaluation system and method under multi-pulse influence of humid environment |
| CN114184905A (en) * | 2021-11-08 | 2022-03-15 | 西南交通大学 | XLPE cable insulation water tree aging state evaluation method based on current migration coefficient |
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