CN116148719A - Lightning arrester state monitoring method, device, equipment and storage medium - Google Patents
Lightning arrester state monitoring method, device, equipment and storage medium Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/56—Testing of electric apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/04—Measuring peak values or amplitude or envelope of ac or of pulses
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
Abstract
The application discloses a lightning arrester state monitoring method, device, equipment and storage medium, wherein fundamental voltage amplitude and first phase of a bus voltage signal where a lightning arrester is located, and second phase, fundamental current amplitude, third harmonic amplitude and fifth harmonic amplitude of a leakage current signal are obtained; determining a target fundamental wave current amplitude, a target third harmonic amplitude and a target fifth harmonic amplitude corresponding to a second phase which is the same as the first phase in the leakage current signal, and directly providing a reference phase without analog quantity processing like a traditional method; and finally, monitoring the equipment state of the arrester by utilizing a preset nonlinear expression of the leakage current of the arrester according to the fundamental wave voltage amplitude, the target fundamental wave current amplitude, the target third harmonic amplitude and the target fifth harmonic amplitude so as to realize the integral and accurate judgment of the nonlinear characteristics of the arrester, thereby realizing the accurate description and evaluation of the state of the arrester.
Description
Technical Field
The application relates to the technical field of power grid safety, in particular to a lightning arrester state monitoring method, device, equipment and storage medium.
Background
In a high-voltage power grid, the zinc oxide arrester is a protection device for protecting electrical equipment from overvoltage, but due to the reasons that a zinc oxide valve plate is affected by damp, aged, influenced by environmental pollution, and operated under abnormal conditions, the safe and reliable operation life of the zinc oxide arrester can be reduced, even explosion accidents are caused, large-area power failure is caused, and the capability of protecting the electrical equipment from damage is lost. Therefore, the condition of the zinc oxide lightning arrester is monitored on line, faults can be effectively avoided, and the safe operation of power equipment is facilitated.
At present, the related art mainly judges the state of the lightning arrester based on the fundamental wave or third harmonic wave of the lightning arrester alone, and the influence of higher harmonic waves is not considered, so that the accuracy of the judging result of the state of the lightning arrester is not high. Therefore, there is a need for a method of monitoring the condition of a lightning arrester that takes into account the effects of higher harmonics.
Disclosure of Invention
The application provides a lightning arrester state monitoring method, device, equipment and storage medium, which are used for solving the technical problem that the accuracy of a lightning arrester state judgment result is not high.
To solve the above technical problem, in a first aspect, the present application provides a lightning arrester state monitoring method, including:
acquiring fundamental wave voltage amplitude and first phase of a bus voltage signal where the lightning arrester is located, and second phase, fundamental wave current amplitude, third harmonic amplitude and fifth harmonic amplitude of a leakage current signal of the lightning arrester;
determining a target fundamental wave current amplitude, a target third harmonic amplitude and a target fifth harmonic amplitude corresponding to a second phase which is the same as the first phase in the leakage current signal according to the first phase and the second phase;
and monitoring the equipment state of the lightning arrester according to the fundamental wave voltage amplitude, the target fundamental wave current amplitude, the target third harmonic amplitude and the target fifth harmonic amplitude by using a preset nonlinear expression of the leakage current of the lightning arrester.
In some implementations, the determining, according to the first phase and the second phase, a target fundamental current amplitude, a target third harmonic amplitude, and a target fifth harmonic amplitude corresponding to a second phase, which is the same as the first phase, in the leakage current signal includes:
querying a target second phase of the leakage current signal which is the same as the first phase;
and extracting a current component corresponding to the target second phase in the leakage current signal based on an equivalent circuit relation of the lightning arrester, wherein the current component comprises the target fundamental wave current amplitude, the target third harmonic amplitude and the target fifth harmonic amplitude.
In some implementations, the monitoring the device status of the arrester using a preset nonlinear expression of arrester leakage current based on the fundamental voltage amplitude, the target fundamental current amplitude, the target third harmonic amplitude, and the target fifth harmonic amplitude includes:
calculating a first nonlinear correlation coefficient, a second nonlinear correlation coefficient and a third nonlinear correlation coefficient of the lightning arrester based on the fundamental wave current amplitude, the target third harmonic amplitude and the target fifth harmonic amplitude by using a preset correlation coefficient calculation formula;
and monitoring the equipment state of the lightning arrester according to the fundamental voltage amplitude, the first nonlinear correlation coefficient, the second nonlinear correlation coefficient and the third nonlinear correlation coefficient by using the preset nonlinear expression.
In some implementations, the preset nonlinear expression is:
i r ≈A 1 U m +A 3 U m 3 +A 5 U m 5 ；
wherein i is r U for leakage current of lightning arrester m For the amplitude of the fundamental wave voltage, A 1 A first nonlinear correlation coefficient corresponding to the target fundamental wave current amplitude 3 A second nonlinear correlation coefficient corresponding to the target third harmonic amplitude 5 And the third nonlinear correlation coefficient corresponding to the target fifth harmonic amplitude is obtained.
In some implementations, the acquiring the fundamental voltage amplitude and the first phase of the bus voltage signal where the lightning arrester is located, and the second phase, the fundamental current amplitude, the third harmonic amplitude, and the fifth harmonic amplitude of the leakage current signal of the lightning arrester includes:
collecting a voltage signal of a bus where the lightning arrester is located and a leakage current signal of the lightning arrester;
performing Fourier operation on the voltage signal to obtain a fundamental voltage amplitude and a first phase of the voltage signal;
and carrying out Fourier operation on the leakage current signal to obtain a second phase, a fundamental current amplitude, a third harmonic amplitude and a fifth harmonic amplitude of the leakage current signal.
In a second aspect, the present application further provides a lightning arrester state monitoring device, including:
the acquisition module is used for acquiring fundamental wave voltage amplitude and first phase of a bus voltage signal where the lightning arrester is located, and second phase, fundamental wave current amplitude, third harmonic amplitude and fifth harmonic amplitude of a leakage current signal of the lightning arrester;
the determining module is used for determining a target fundamental wave current amplitude value, a target third harmonic amplitude value and a target fifth harmonic amplitude value corresponding to a second phase which is the same as the first phase in the leakage current signal according to the first phase and the second phase;
and the monitoring module is used for monitoring the equipment state of the lightning arrester according to the fundamental wave voltage amplitude, the target fundamental wave current amplitude, the target third harmonic amplitude and the target fifth harmonic amplitude by utilizing a preset nonlinear expression of the leakage current of the lightning arrester.
In some implementations, the determining module is specifically configured to:
querying a target second phase of the leakage current signal which is the same as the first phase;
and extracting a current component corresponding to the target second phase in the leakage current signal based on an equivalent circuit relation of the lightning arrester, wherein the current component comprises the target fundamental wave current amplitude, the target third harmonic amplitude and the target fifth harmonic amplitude.
In some implementations, the monitoring module is specifically configured to:
calculating a first nonlinear correlation coefficient, a second nonlinear correlation coefficient and a third nonlinear correlation coefficient of the lightning arrester based on the fundamental wave current amplitude, the target third harmonic amplitude and the target fifth harmonic amplitude by using a preset correlation coefficient calculation formula;
and monitoring the equipment state of the lightning arrester according to the fundamental voltage amplitude, the first nonlinear correlation coefficient, the second nonlinear correlation coefficient and the third nonlinear correlation coefficient by using the preset nonlinear expression.
In a third aspect, the present application also provides a computer device comprising a processor and a memory for storing a computer program which, when executed by the processor, implements the lightning arrester condition monitoring method according to the first aspect.
In a fourth aspect, the present application also provides a computer readable storage medium storing a computer program which, when executed by a processor, implements the lightning arrester condition monitoring method according to the first aspect.
Compared with the prior art, the application has the following beneficial effects:
the method comprises the steps of obtaining fundamental wave voltage amplitude and first phase of a bus voltage signal where an arrester is located, and second phase, fundamental wave current amplitude, third harmonic amplitude and fifth harmonic amplitude of a leakage current signal of the arrester, so that a plurality of current characteristic quantities are considered in monitoring of the state of the arrester; according to the first phase and the second phase, determining a target fundamental wave current amplitude, a target third harmonic amplitude and a target fifth harmonic amplitude corresponding to a second phase which is the same as the first phase in the leakage current signal, so as to avoid the danger possibly caused by temporarily acquiring a reference voltage signal in a conventional live test mode, and simultaneously, the method directly provides the reference phase without analog quantity processing like a traditional method (such as a compensation method and the like); and finally, monitoring the equipment state of the arrester by utilizing a preset nonlinear expression of the leakage current of the arrester according to the fundamental wave voltage amplitude, the target fundamental wave current amplitude, the target third harmonic amplitude and the target fifth harmonic amplitude so as to realize the integral and accurate judgment of the nonlinear characteristics of the arrester, thereby fully playing the advantages of synchronous test, realizing the comprehensive consideration of the relevant indexes of the arrester and realizing the accurate description and evaluation of the state of the arrester.
Drawings
Fig. 1 is a schematic flow chart of a lightning arrester state monitoring method according to an embodiment of the present application;
fig. 2 is a schematic diagram of an equivalent circuit and a vector relationship of a zinc oxide arrester shown in an embodiment of the present application;
FIG. 3 is an equivalent schematic view of a zinc oxide arrester shown in an embodiment of the present application;
fig. 4 is a schematic diagram of the volt pattern characteristic of the nonlinear original shown in the embodiment of the present application;
fig. 5 is a schematic structural view of a lightning arrester state monitoring device according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a computer device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
Referring to fig. 1, fig. 1 is a flow chart of a lightning arrester state monitoring method according to an embodiment of the present application. The lightning arrester state monitoring method can be applied to computer equipment, wherein the computer equipment comprises, but is not limited to, smart phones, notebook computers, tablet computers, desktop computers, physical servers, cloud servers and the like. As shown in fig. 1, the lightning arrester state monitoring method of the present embodiment includes steps S101 to S103, which are described in detail below:
step S101, acquiring fundamental wave voltage amplitude and first phase of a bus voltage signal where the lightning arrester is located, and second phase, fundamental wave current amplitude, third harmonic amplitude and fifth harmonic amplitude of a leakage current signal of the lightning arrester.
Step S102, determining, according to the first phase and the second phase, a target fundamental current amplitude, a target third harmonic amplitude, and a target fifth harmonic amplitude corresponding to a second phase identical to the first phase in the leakage current signal.
And step S103, monitoring the equipment state of the lightning arrester according to the fundamental wave voltage amplitude, the target fundamental wave current amplitude, the target third harmonic amplitude and the target fifth harmonic amplitude by using a preset nonlinear expression of the leakage current of the lightning arrester.
In the embodiment, the fundamental wave voltage amplitude and the first phase of the bus voltage signal where the lightning arrester is located and the second phase, the fundamental wave current amplitude, the third harmonic amplitude and the fifth harmonic amplitude of the leakage current signal of the lightning arrester are obtained, so that a plurality of current characteristic quantities are considered in monitoring of the state of the lightning arrester; according to the first phase and the second phase, determining a target fundamental wave current amplitude, a target third harmonic amplitude and a target fifth harmonic amplitude corresponding to a second phase which is the same as the first phase in the leakage current signal, so as to avoid the danger possibly caused by temporarily acquiring a reference voltage signal in a conventional live test mode, and simultaneously, the method directly provides the reference phase without analog quantity processing like a traditional method (such as a compensation method and the like); and finally, monitoring the equipment state of the arrester by utilizing a preset nonlinear expression of the leakage current of the arrester according to the fundamental wave voltage amplitude, the target fundamental wave current amplitude, the target third harmonic amplitude and the target fifth harmonic amplitude so as to realize the integral and accurate judgment of the nonlinear characteristics of the arrester, thereby fully playing the advantages of synchronous test, realizing the comprehensive consideration of the relevant indexes of the arrester and realizing the accurate description and evaluation of the state of the arrester.
In some embodiments, the step S101 includes:
collecting a voltage signal of a bus where the lightning arrester is located and a leakage current signal of the lightning arrester;
performing Fourier operation on the voltage signal to obtain a fundamental voltage amplitude and a first phase of the voltage signal;
and carrying out Fourier operation on the leakage current signal to obtain a second phase, a fundamental current amplitude, a third harmonic amplitude and a fifth harmonic amplitude of the leakage current signal.
In this embodiment, voltage signals of the bus where the lightning arrester is located are obtained through a voltage transformer and the like, and fourier operation is performed on the collected voltage signals of at least two cycles at intervals of N sampling points to obtain a system fundamental wave voltage amplitude U m And a first phase at a certain time
Synchronously collecting leakage current signals of the lightning arrester, namely current signals passing through a grounding downlead of the lightning arrester, and carrying out Fourier operation on the collected current signals of at least two cycles at intervals of N sampling points; obtain the fundamental wave current amplitude k of the lightning arrester current 1 Second phase->
Third harmonic amplitude k 3 And fifth harmonic amplitude k 5 。
In some embodiments, the step S102 includes:
querying a target second phase of the leakage current signal which is the same as the first phase;
and extracting a current component corresponding to the target second phase in the leakage current signal based on an equivalent circuit relation of the lightning arrester, wherein the current component comprises the target fundamental wave current amplitude, the target third harmonic amplitude and the target fifth harmonic amplitude.
In this embodiment, data transmission between the voltage transformer and the current sensor is realized by adopting a wireless communication mode (such as bluetooth, wifi, etc.), and the first phase is performed based on an equivalent circuit schematic diagram and a vector relationship schematic diagram of the zinc oxide arrester as shown in fig. 2
And second phase->
Comparing to determine the same current component of the lightning arrester fundamental current as the first phase, i.e. the fundamental current amplitude K of the leakage current fundamental 1 。
In some embodiments, the step S103 includes:
calculating a first nonlinear correlation coefficient, a second nonlinear correlation coefficient and a third nonlinear correlation coefficient of the lightning arrester based on the fundamental wave current amplitude, the target third harmonic amplitude and the target fifth harmonic amplitude by using a preset correlation coefficient calculation formula;
and monitoring the equipment state of the lightning arrester according to the fundamental voltage amplitude, the first nonlinear correlation coefficient, the second nonlinear correlation coefficient and the third nonlinear correlation coefficient by using the preset nonlinear expression.
In this step, as shown in fig. 3, an equivalent schematic diagram of the zinc oxide arrester, where R is a nonlinear element, and its volt-ampere characteristic is shown in fig. 4, and the curve of fig. 4 can be expressed as:
i r ＝∑A i U i ，i＝1，3，5；
wherein, if the applied voltage is sinusoidal, i.e. u=u m sin (wt), and considering that the effect of lower harmonics on lightning arrester characteristics is more obvious than higher harmonic effect in practical engineering applications,it can be seen that A is derived from the actual measured harmonic current i Then use A i Whether the change is sufficient or not expresses the nonlinear characteristic change condition of the lightning arrester. Only the leakage current resistance component of the lightning arrester is taken for 5 times and the following harmonic nonlinear expressions are abbreviated as:
i r ≈A 1 U m +A 3 U m 3 +A 5 U m 5 ；
then i r Can be expressed as:
it can be seen that the higher harmonics have little effect on the 5 th harmonic, which is ignored and the 5 th harmonic term is considered to be only with A 5 And the coefficients of the nonlinear expression can be deduced, so that an accurate lightning arrester characteristic description expression is obtained.
It can be seen that the known quantity K is found from the actual measurement 5 A can be calculated by the following formula 5 ：
A 5 ＝16×K 5 /U m ；
Further calculate A according to the following formula 3 ：
A 3 ＝-4(K 3 +5×K 5 )/U m ；
Further calculate A according to the following formula 1 ：
Thus, the preset nonlinear expression is:
i r ≈A 1 U m +A 3 U m 3 +A 5 U m 5 ；
wherein i is r U for leakage current of lightning arrester m For the amplitude of the fundamental wave voltage, A 1 First non-corresponding to the target fundamental current amplitudeLinear correlation coefficient, A 3 A second nonlinear correlation coefficient corresponding to the target third harmonic amplitude 5 And the third nonlinear correlation coefficient corresponding to the target fifth harmonic amplitude is obtained.
When coefficient A 1 、A 3 Or A 5 Changes (e.g. A) 1 Exceeding a certain limit of 100%, etc.), it indicates that the arrester is degraded, and a power outage retest is required in time.
It should be noted that, the method provides a plurality of parameters related to nonlinear characteristics for the lightning arrester based on wireless synchronization and other testing technologies, the method not only avoids the danger possibly caused by temporarily acquiring a reference voltage signal in the prior live test mode, adopts a voltage monitoring device which is stably installed for a long time to provide signals, but also can be used for monitoring other equipment and power grid operation, greatly improves the intensive level of monitoring equipment, simultaneously directly provides a reference phase, does not need to process analog quantity like the traditional method (such as a compensation method and the like), and can simultaneously adopt a plurality of characteristic quantities to realize synchronous measurement of resistive current fundamental wave, 3 rd harmonic wave and 5 th harmonic wave, and realize integral and accurate judgment of nonlinear characteristics of the lightning arrester for the first time. Therefore, the synchronous test advantage is fully exerted, comprehensive consideration of relevant indexes of the lightning arrester is realized, and accurate description and evaluation of the state of the lightning arrester are realized.
In order to execute the lightning arrester state monitoring method corresponding to the method embodiment, corresponding functions and technical effects are achieved. Referring to fig. 5, fig. 5 shows a block diagram of a lightning arrester state monitoring device according to an embodiment of the present application. For convenience of explanation, only the portions related to this embodiment are shown, and the lightning arrester state monitoring device provided in this embodiment of the present application includes:
the acquiring module 501 is configured to acquire a fundamental voltage amplitude and a first phase of a bus voltage signal where the lightning arrester is located, and a second phase, a fundamental current amplitude, a third harmonic amplitude and a fifth harmonic amplitude of a leakage current signal of the lightning arrester;
a determining module 502, configured to determine, according to the first phase and the second phase, a target fundamental current amplitude, a target third harmonic amplitude, and a target fifth harmonic amplitude corresponding to a second phase that is the same as the first phase in the leakage current signal;
and the monitoring module 503 is configured to monitor a device state of the lightning arrester according to the fundamental voltage amplitude, the target fundamental current amplitude, the target third harmonic amplitude and the target fifth harmonic amplitude by using a preset nonlinear expression of leakage current of the lightning arrester.
In some embodiments, the determining module 502 is specifically configured to:
querying a target second phase of the leakage current signal which is the same as the first phase;
and extracting a current component corresponding to the target second phase in the leakage current signal based on an equivalent circuit relation of the lightning arrester, wherein the current component comprises the target fundamental wave current amplitude, the target third harmonic amplitude and the target fifth harmonic amplitude.
In some embodiments, the monitoring module 503 is specifically configured to:
calculating a first nonlinear correlation coefficient, a second nonlinear correlation coefficient and a third nonlinear correlation coefficient of the lightning arrester based on the fundamental wave current amplitude, the target third harmonic amplitude and the target fifth harmonic amplitude by using a preset correlation coefficient calculation formula;
and monitoring the equipment state of the lightning arrester according to the fundamental voltage amplitude, the first nonlinear correlation coefficient, the second nonlinear correlation coefficient and the third nonlinear correlation coefficient by using the preset nonlinear expression.
In some embodiments, the preset nonlinear expression is:
i r ≈A 1 U m +A 3 U m 3 +A 5 U m 5 ；
wherein i is r U for leakage current of lightning arrester m For the amplitude of the fundamental wave voltage, A 1 A first nonlinear correlation coefficient corresponding to the target fundamental wave current amplitude 3 A second nonlinear correlation corresponding to the target third harmonic amplitudeCoefficient A 5 And the third nonlinear correlation coefficient corresponding to the target fifth harmonic amplitude is obtained.
In some embodiments, the obtaining module 501 is specifically configured to:
collecting a voltage signal of a bus where the lightning arrester is located and a leakage current signal of the lightning arrester;
performing Fourier operation on the voltage signal to obtain a fundamental voltage amplitude and a first phase of the voltage signal;
and carrying out Fourier operation on the leakage current signal to obtain a second phase, a fundamental current amplitude, a third harmonic amplitude and a fifth harmonic amplitude of the leakage current signal.
The lightning arrester state monitoring device can implement the lightning arrester state monitoring method of the method embodiment. The options in the method embodiments described above are also applicable to this embodiment and will not be described in detail here. The rest of the embodiments of the present application may refer to the content of the method embodiments described above, and in this embodiment, no further description is given.
Fig. 6 is a schematic structural diagram of a computer device according to an embodiment of the present application. As shown in fig. 6, the computer device 6 of this embodiment includes: at least one processor 60 (only one is shown in fig. 6), a memory 61 and a computer program 62 stored in the memory 61 and executable on the at least one processor 60, the processor 60 implementing the steps in any of the method embodiments described above when executing the computer program 62.
The computer device 6 may be a smart phone, a tablet computer, a desktop computer, a cloud server, or the like. The computer device may include, but is not limited to, a processor 60, a memory 61. It will be appreciated by those skilled in the art that fig. 6 is merely an example of computer device 6 and is not intended to be limiting of computer device 6, and may include more or fewer components than shown, or may combine certain components, or different components, such as may also include input-output devices, network access devices, etc.
The processor 60 may be a central processing unit (Central Processing Unit, CPU), the processor 60 may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 61 may in some embodiments be an internal storage unit of the computer device 6, such as a hard disk or a memory of the computer device 6. The memory 61 may in other embodiments also be an external storage device of the computer device 6, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card) or the like, which are provided on the computer device 6. Further, the memory 61 may also include both an internal storage unit and an external storage device of the computer device 6. The memory 61 is used for storing an operating system, application programs, boot loader (BootLoader), data, other programs, etc., such as program codes of the computer program. The memory 61 may also be used for temporarily storing data that has been output or is to be output.
In addition, the embodiment of the present application further provides a computer readable storage medium, where a computer program is stored, where the computer program is executed by a processor to implement the steps in any of the above-mentioned method embodiments.
The present embodiments provide a computer program product which, when run on a computer device, causes the computer device to perform the steps of the method embodiments described above.
In several embodiments provided herein, it will be understood that each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device to perform all or part of the steps of the method described in the various embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing embodiments have been provided for the purpose of illustrating the objects, technical solutions and advantages of the present application in further detail, and it should be understood that the foregoing embodiments are merely examples of the present application and are not intended to limit the scope of the present application. It should be noted that any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art, which are within the spirit and principles of the present application, are intended to be included within the scope of the present application.
Claims (10)
1. A method for monitoring the condition of a lightning arrester, comprising:
acquiring fundamental wave voltage amplitude and first phase of a bus voltage signal where the lightning arrester is located, and second phase, fundamental wave current amplitude, third harmonic amplitude and fifth harmonic amplitude of a leakage current signal of the lightning arrester;
determining a target fundamental wave current amplitude, a target third harmonic amplitude and a target fifth harmonic amplitude corresponding to a second phase which is the same as the first phase in the leakage current signal according to the first phase and the second phase;
and monitoring the equipment state of the lightning arrester according to the fundamental wave voltage amplitude, the target fundamental wave current amplitude, the target third harmonic amplitude and the target fifth harmonic amplitude by using a preset nonlinear expression of the leakage current of the lightning arrester.
2. The lightning arrester state monitoring method according to claim 1, wherein determining, from the first phase and the second phase, a target fundamental current amplitude, a target third harmonic amplitude, and a target fifth harmonic amplitude corresponding to a second phase identical to the first phase in the leakage current signal includes:
querying a target second phase of the leakage current signal which is the same as the first phase;
and extracting a current component corresponding to the target second phase in the leakage current signal based on an equivalent circuit relation of the lightning arrester, wherein the current component comprises the target fundamental wave current amplitude, the target third harmonic amplitude and the target fifth harmonic amplitude.
3. The arrester state monitoring method of claim 1, wherein the monitoring the device state of the arrester based on the fundamental voltage amplitude, the target fundamental current amplitude, the target third harmonic amplitude, and the target fifth harmonic amplitude using a preset nonlinear expression of arrester leakage current, comprises:
calculating a first nonlinear correlation coefficient, a second nonlinear correlation coefficient and a third nonlinear correlation coefficient of the lightning arrester based on the fundamental wave current amplitude, the target third harmonic amplitude and the target fifth harmonic amplitude by using a preset correlation coefficient calculation formula;
and monitoring the equipment state of the lightning arrester according to the fundamental voltage amplitude, the first nonlinear correlation coefficient, the second nonlinear correlation coefficient and the third nonlinear correlation coefficient by using the preset nonlinear expression.
4. A lightning arrester state monitoring method according to claim 3, wherein the preset nonlinear expression is:
i r ≈A 1 U m + 3 U m 3 + 5 U m 5 ；
wherein i is r U for leakage current of lightning arrester m For the amplitude of the fundamental wave voltage, A 1 A first nonlinear correlation coefficient corresponding to the target fundamental wave current amplitude 3 A second nonlinear correlation coefficient corresponding to the target third harmonic amplitude 5 And the third nonlinear correlation coefficient corresponding to the target fifth harmonic amplitude is obtained.
5. The method for monitoring the state of an arrester according to claim 1, wherein the step of obtaining the fundamental voltage amplitude and the first phase of the bus voltage signal in which the arrester is located, and the second phase, the fundamental current amplitude, the third harmonic amplitude and the fifth harmonic amplitude of the leakage current signal of the arrester comprises:
collecting a voltage signal of a bus where the lightning arrester is located and a leakage current signal of the lightning arrester;
performing Fourier operation on the voltage signal to obtain a fundamental voltage amplitude and a first phase of the voltage signal;
and carrying out Fourier operation on the leakage current signal to obtain a second phase, a fundamental current amplitude, a third harmonic amplitude and a fifth harmonic amplitude of the leakage current signal.
6. A lightning arrester condition monitoring device, comprising:
the acquisition module is used for acquiring fundamental wave voltage amplitude and first phase of a bus voltage signal where the lightning arrester is located, and second phase, fundamental wave current amplitude, third harmonic amplitude and fifth harmonic amplitude of a leakage current signal of the lightning arrester;
the determining module is used for determining a target fundamental wave current amplitude value, a target third harmonic amplitude value and a target fifth harmonic amplitude value corresponding to a second phase which is the same as the first phase in the leakage current signal according to the first phase and the second phase;
and the monitoring module is used for monitoring the equipment state of the lightning arrester according to the fundamental wave voltage amplitude, the target fundamental wave current amplitude, the target third harmonic amplitude and the target fifth harmonic amplitude by utilizing a preset nonlinear expression of the leakage current of the lightning arrester.
7. The lightning arrester state monitoring device of claim 6, wherein the determination module is specifically configured to:
querying a target second phase of the leakage current signal which is the same as the first phase;
and extracting a current component corresponding to the target second phase in the leakage current signal based on an equivalent circuit relation of the lightning arrester, wherein the current component comprises the target fundamental wave current amplitude, the target third harmonic amplitude and the target fifth harmonic amplitude.
8. The lightning arrester state monitoring device of claim 6, wherein the monitoring module is specifically configured to:
calculating a first nonlinear correlation coefficient, a second nonlinear correlation coefficient and a third nonlinear correlation coefficient of the lightning arrester based on the fundamental wave current amplitude, the target third harmonic amplitude and the target fifth harmonic amplitude by using a preset correlation coefficient calculation formula;
and monitoring the equipment state of the lightning arrester according to the fundamental voltage amplitude, the first nonlinear correlation coefficient, the second nonlinear correlation coefficient and the third nonlinear correlation coefficient by using the preset nonlinear expression.
9. A computer device comprising a processor and a memory for storing a computer program which when executed by the processor implements the lightning arrester condition monitoring method according to any of claims 1 to 5.
10. A computer-readable storage medium, characterized in that it stores a computer program which, when executed by a processor, implements the arrester condition monitoring method according to any of claims 1 to 5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310101801.6A CN116148719A (en) | 2023-02-08 | 2023-02-08 | Lightning arrester state monitoring method, device, equipment and storage medium |
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| CN202310101801.6A CN116148719A (en) | 2023-02-08 | 2023-02-08 | Lightning arrester state monitoring method, device, equipment and storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117559375A (en) * | 2024-01-12 | 2024-02-13 | 国网浙江省电力有限公司宁波供电公司 | Control method and device of lightning arrester system and lightning arrester system |
| CN117559375B (en) * | 2024-01-12 | 2024-05-17 | 国网浙江省电力有限公司宁波供电公司 | Control method and device of lightning arrester system and lightning arrester system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117559375A (en) * | 2024-01-12 | 2024-02-13 | 国网浙江省电力有限公司宁波供电公司 | Control method and device of lightning arrester system and lightning arrester system |
| CN117559375B (en) * | 2024-01-12 | 2024-05-17 | 国网浙江省电力有限公司宁波供电公司 | Control method and device of lightning arrester system and lightning arrester system |
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