CN113671366A - Signal processing method, application device thereof and storage medium - Google Patents
Signal processing method, application device thereof and storage medium Download PDFInfo
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Abstract
The application provides a signal processing method, an application device and a storage medium thereof, wherein in the action process of a switching device, a switching-off coil current signal and a switching-on coil current signal of the switching device are respectively obtained; judging whether the current signal of the opening coil and the current signal of the closing coil meet interference coupling conditions or not; if so, comparing and analyzing the switching-on coil current signal and the switching-on coil current signal to obtain an actual current signal of the switching equipment in the action process; the method and the device can utilize the characteristic that a strong interference signal always exists in two measuring channels of current of the switching-on coil and the switching-off coil in the action process of the switching equipment, carry out contrastive analysis on the current signals of the switching-on coil and the switching-off coil to obtain the actual current signal of the switching equipment in the action process, and solve the problems that the measured current signal does not have typical characteristics and the intelligent monitoring device of the switching equipment cannot directly acquire corresponding characteristic parameters to evaluate the state of the circuit breaker due to insufficient field shielding measures.
Description
Technical Field
The present invention relates to the field of signal processing technologies, and in particular, to a signal processing method, an application apparatus thereof, and a storage medium.
Background
When a circuit of the high-voltage circuit breaker has a short-circuit fault, the fault current of the high-voltage circuit breaker is far larger than the load current, and the short-circuit current of different types can reach dozens of kA or even hundreds of kA. Under normal conditions, when the shielding measures on the measurement site are perfect, the detected current waveform of the opening and closing coil is shown in figure 1.
However, when the shielding measures on the measurement site are insufficient, as shown in fig. 2, a high-amplitude large current is often coupled to a related analog quantity measurement path, and an interference waveform similar to the short-circuit current characteristic is coupled to the detected current waveform of the switching-on/off coil, so that the measured current signal does not have a typical characteristic, and the intelligent monitoring device of the switching device cannot directly acquire a corresponding characteristic parameter to evaluate the state of the circuit breaker.
Disclosure of Invention
Therefore, the application provides a signal processing method, an application device thereof and a storage medium, so as to solve the problems that due to insufficient field shielding measures, a measured current signal does not have typical characteristics, and a switchgear intelligent monitoring device cannot directly acquire corresponding characteristic parameters to evaluate the state of a circuit breaker.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
the first aspect of the present invention discloses a signal processing method, including:
respectively acquiring a switching-off coil current signal and a switching-on coil current signal of the switching equipment in the action process of the switching equipment;
judging whether the current signal of the opening coil and the current signal of the closing coil meet interference coupling conditions or not;
if the judgment result is yes, comparing and analyzing the opening coil current signal and the closing coil current signal to obtain an actual current signal of the switching equipment in the action process.
Optionally, in the above signal processing method, acquiring a switching-off coil current signal and a switching-on coil current signal of the switching device includes:
sampling the current of a brake separating coil of the switch equipment to obtain a current signal of the brake separating coil;
and sampling the current of a closing coil of the switching equipment to obtain a current signal of the closing coil.
Optionally, in the signal processing method, the determining whether the opening coil current signal and the closing coil current signal satisfy an interference coupling condition includes:
judging whether the current signal of the opening coil and the current signal of the closing coil are both larger than a preset threshold value;
if the current signal of the opening coil and the current signal of the closing coil are both larger than the preset threshold value, the current signal of the opening coil and the current signal of the closing coil are judged to meet the interference coupling condition;
and if at least one of the opening coil current signal and the closing coil current signal is judged to be not larger than the preset threshold value, judging that the opening coil current signal and the closing coil current signal do not meet the interference coupling condition.
Optionally, in the above signal processing method, comparing and analyzing the opening coil current signal and the closing coil current signal to obtain an actual current signal of the switching device in an operation process, includes:
respectively carrying out spectrum analysis on the opening coil current signal and the closing coil current signal to obtain a spectrum analysis result of the opening coil current signal and a spectrum analysis result of the closing coil current signal;
according to the frequency spectrum analysis result, identifying an interference current signal generating an interference signal and a normal current signal not generating the interference signal in the opening coil current signal and the closing coil current signal;
determining an interference waveform scaling factor based on the interference current signal and the normal current signal;
and determining an actual current signal of the switching equipment in the action process based on the interference current signal, the normal current signal and the interference waveform scale factor.
Optionally, in the above signal processing method, identifying, according to the result of the spectrum analysis, the interference current signal generating an interference signal and the normal current signal not generating an interference signal from the opening coil current signal and the closing coil current signal includes:
determining a component ratio module value of the current signal of the opening coil and a component ratio module value of the current signal of the closing coil according to a frequency spectrum analysis result of the current signal of the opening coil and a frequency spectrum analysis result of the current signal of the closing coil respectively; the component ratio module value is a module of the amplitude ratio of the work frequency component and the direct current component in the corresponding current signal;
and taking the current signal corresponding to the larger component ratio module value as the interference current signal and taking the current signal corresponding to the smaller component ratio module value as the normal current signal in the component ratio module value of the opening coil current signal and the component ratio module value of the closing coil current signal.
Optionally, in the above signal processing method, determining an interference waveform scaling factor based on the interference current signal and the normal current signal includes:
respectively determining energy summation results of the interference current signal and the normal current signal under a target frequency band;
and comparing the energy summation results of the two and carrying out evolution operation to obtain the interference waveform scale factor.
Optionally, in the above signal processing method, determining an actual current signal of the switching device during the operation process based on the interference current signal, the normal current signal, and the interference waveform scaling factor includes:
according to the formula I ═ I- λ IiCalculating to obtain an actual current signal of the switching equipment in the action process;
wherein I' represents the actual current signal of the switch device during the action, I represents the normal current signal, IiRepresenting the interference current signal and lambda representing the interference waveform scaling factor.
The second aspect of the present invention discloses an intelligent detection device for a switchgear, which, in the process of monitoring the switchgear, comprises: for performing the signal processing method of any of the first aspect disclosures.
A third aspect of the present invention discloses an electronic device, comprising: a memory and a processor;
wherein the memory is for storing a computer program;
the processor is configured to execute the computer instructions stored in the memory, and in particular, to perform the signal processing method according to any one of the first aspect disclosure.
A fourth aspect of the present invention discloses a storage medium for storing a computer program for implementing the signal processing method as disclosed in any one of the first aspects when the computer program is executed.
The signal processing method provided by the invention comprises the following steps: respectively acquiring a switching-off coil current signal and a switching-on coil current signal of the switching equipment in the action process of the switching equipment; judging whether the current signal of the opening coil and the current signal of the closing coil meet interference coupling conditions or not; if the judgment result is yes, comparing and analyzing the switching-on coil current signal and the switching-on coil current signal to obtain an actual current signal of the switching equipment in the action process; that is, this application can utilize switchgear in the action process, strong interfering signal always in the branch, the characteristics that exist simultaneously in two measuring channels of closing coil electric current, carry out contrastive analysis to branch switching coil current signal and closing coil current signal, obtain switchgear actual current signal in the action process, solve because of on-the-spot shielding measure is not enough, easily lead to the current signal who surveys not have typical characteristics, switchgear intelligent monitoring device can not directly acquire the problem that corresponding characteristic parameter assesses the circuit breaker state.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 and fig. 2 are waveform diagrams of current waveforms of the opening and closing coils in two different situations provided by the embodiment of the present application;
fig. 3 is a flowchart of a signal processing method according to an embodiment of the present application;
fig. 4 is a flowchart of determining whether an interference coupling condition is satisfied according to an embodiment of the present disclosure;
FIG. 5 is a flow chart illustrating a method for distinguishing between an interference current signal and a normal current signal according to an embodiment of the present disclosure;
FIG. 6 is a flow chart illustrating another method for differentiating between a disturbance current signal and a normal current signal according to an embodiment of the present application;
fig. 7 is a flowchart of determining an interference waveform scaling factor according to an embodiment of the present application;
fig. 8 is a frequency spectrum characteristic diagram of an interference waveform according to an embodiment of the present application;
FIG. 9 is a graph of spectral characteristics of a normal waveform provided by an embodiment of the present application;
fig. 10 is a flowchart of another signal processing method provided in the embodiment of the present application;
fig. 11 is a comparison graph of waveforms of a switching-off coil current signal and a switching-on coil current signal according to an embodiment of the present disclosure;
fig. 12 is a schematic diagram illustrating a result of a spectrum analysis of a current signal of a switching coil according to an embodiment of the present application;
fig. 13 is a schematic diagram of a result of a spectrum analysis of a closing coil current signal according to an embodiment of the present disclosure;
FIG. 14 is a waveform diagram of an actual normal coil current provided by an embodiment of the present application;
fig. 15 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the application provides a signal processing method, which aims to solve the problems that due to insufficient field shielding measures, a measured current signal does not have typical characteristics easily, and a switchgear intelligent monitoring device cannot directly acquire corresponding characteristic parameters to evaluate the state of a circuit breaker.
Referring to fig. 3, the signal processing method may include the following steps:
s100, in the action process of the switch device, a switching-off coil current signal and a switching-on coil current signal of the switch device are respectively obtained.
In practical application, the switch equipment can be a high-voltage circuit breaker, a high-voltage load tube, a high-voltage isolating switch and the like, and the switch equipment can be determined according to specific application environment and user requirements.
In a specific application process, a current signal of a switching-off coil can be obtained by sampling the current of the switching-off coil of the switching device; the current signal of the closing coil is obtained by sampling the current of the closing coil of the switching device.
The opening coil and the closing coil of the switch device can be the opening coil and the closing coil of an operating mechanism in the switch device.
Specifically, the currents of the opening coil and the closing coil of the switching device can be respectively sampled by two independent current transformers, that is, two independent measuring paths are adopted, so that a current signal of the opening coil and a current signal of the closing coil are obtained.
It should be noted that, besides the specific way of obtaining the current signal through the current transformer, other existing ways may also be adopted to obtain the corresponding current signal, and the way of obtaining the current signal is not specifically limited in the present application, and all the ways belong to the protection scope of the present application.
It should be noted that the action process of the switching device may be a switching-on action process of the switch, or may be a switching-off action process of the switch, and the action process is determined according to a specific application environment and a user requirement, and both belong to the protection scope of the present application.
S102, judging whether the current signal of the opening coil and the current signal of the closing coil meet interference coupling conditions.
In practical application, a specific process of executing step S102 and determining whether the opening coil current signal and the closing coil current signal satisfy the interference coupling condition may be as shown in fig. 4, and may include the following steps:
s200, judging whether the current signal of the opening coil and the current signal of the closing coil are both larger than a preset threshold value.
Wherein the preset threshold may be 0.3A; of course, the invention is not limited to this, but may also be 0.5A, 1A, etc., which are determined according to the specific application environment and the user's requirement, and the application is not specifically limited, and all belong to the protection scope of the application.
It should be noted that, for example, by using the intelligent detection device for the switching device, two independent current transformers are usually adopted in the process of measuring the current of the opening coil and the current of the closing coil by the intelligent monitoring device for the switching device, so that the two current transformers cannot have significant signals simultaneously under the condition of no interference, and therefore, whether non-negligible interference occurs can be determined by judging whether the obtained current signals of the opening coil and the closing coil are greater than a preset threshold value.
It should be further noted that, in order to ensure that the accuracy of the judgment is improved and the waveform authenticity of the actual current signal is obtained in the subsequent steps, the starting time and the duration time of the current signal of the opening coil and the current signal of the closing coil which are judged are generally kept consistent; of course, the present invention is not limited to this, and a certain difference between the starting time and the duration of the opening coil current signal and the closing coil current signal may be allowed according to the specific application environment and the user requirement.
If the current signal of the opening coil and the current signal of the closing coil are both larger than the preset threshold value, executing the step S202; if at least one of the opening coil current signal and the opening coil current signal is not greater than the preset threshold, step S204 is executed.
S202, judging that the current signal of the opening coil and the current signal of the closing coil meet interference coupling conditions.
And S204, judging that the current signal of the opening coil and the current signal of the closing coil do not meet the interference coupling condition.
In practical applications, after the step S102 is executed and whether the opening coil current signal and the closing coil current signal satisfy the interference coupling condition is determined, if it is determined that the opening coil current signal and the closing coil current signal satisfy the interference coupling condition, that is, the determination result is yes, the step S104 may be executed.
And S104, comparing and analyzing the switching-on coil current signal and the switching-off coil current signal to obtain an actual current signal of the switching equipment in the action process.
In practical application, the specific process of performing step S104, comparing and analyzing the switching coil current signal and the switching coil current signal to obtain the actual current signal of the switching device in the action process may be as shown in fig. 5, and may include the following steps:
s300, respectively carrying out spectrum analysis on the current signal of the switching-off coil and the current signal of the switching-on coil to obtain a spectrum analysis result of the current signal of the switching-off coil and a spectrum analysis result of the current signal of the switching-on coil.
The switching-off coil current signal and the switching-on coil current signal can be subjected to spectrum analysis by Fast Fourier Transform (FFT) respectively to obtain a spectrum analysis result of the switching-off coil current signal and a spectrum analysis result of the switching-on coil current signal.
Of course, the present invention is not limited to this, and other existing spectrum analysis methods may also be adopted, and the specific spectrum analysis method is not limited in the present application, and all of them belong to the protection scope of the present application.
S302, according to the result of the frequency spectrum analysis, an interference current signal generating an interference signal and a normal current signal not generating the interference signal are distinguished from the opening coil current signal and the closing coil current signal.
In practical application, the specific process of executing step S302 and identifying the interference current signal generating the interference signal and the normal current signal not generating the interference signal from the opening coil current signal and the closing coil current signal according to the result of the spectrum analysis is shown in fig. 6, and may include the following steps:
s400, determining a component ratio module value of the current signal of the opening coil and a component ratio module value of the current signal of the closing coil according to a frequency spectrum analysis result of the current signal of the opening coil and a frequency spectrum analysis result of the current signal of the closing coil.
The component ratio module value is a module of the amplitude ratio of the work frequency component and the direct current component in the corresponding current signal.
Specifically, the component ratio modulus of the opening coil current signal is a modulus of the amplitude ratio of the work frequency component and the direct current component in the opening coil current signal; and the component ratio module value of the current signal of the closing coil is a module of the amplitude ratio of the work frequency component and the direct current component in the current signal of the closing coil.
S402, in the component ratio module value of the opening coil current signal and the component ratio module value of the closing coil current signal, the current signal corresponding to the larger component ratio module value is used as an interference current signal, and the current signal corresponding to the smaller component ratio module value is used as a normal current signal.
In practical application, the component ratio modulus of the opening coil current signal and the component ratio modulus of the closing coil current signal can be compared, and in the comparison result of the two, the current signal corresponding to the larger component ratio modulus is used as an interference current signal, and the current signal corresponding to the smaller component ratio modulus is used as a normal current signal.
Of course, the interference current signal and the normal current signal can be distinguished by sampling other modes according to the specific application environment and the user requirement, and the method is not specifically limited and belongs to the protection scope of the method.
And S304, determining an interference waveform scale factor based on the interference current signal and the normal current signal.
In practical applications, the step S304 of determining the interference waveform scaling factor based on the interference current signal and the normal current signal as shown in fig. 7 may include the following steps:
and S500, respectively determining energy summation results of the interference current signal and the normal current signal under the target frequency band.
It should be noted that, because the largest difference between the interference current signal and the normal current signal is in the component near the power frequency, in practical application, 50Hz may be used as the central frequency band, and a smaller frequency band is taken as the target frequency band, and the energy of the smaller frequency band is summed.
In practical applications, if 50Hz is used as the center frequency band, the target frequency band may be 50 ± 20 Hz; of course, the method is not limited to this, and the range of the target frequency band may be determined by itself according to the specific application environment and the user requirement, and the specific value of the target frequency band is not limited in this application, and all belong to the protection scope of this application.
And S502, comparing the energy summation results of the two and carrying out evolution operation to obtain an interference waveform scale factor.
Combining steps S500 and S502, assuming ffto (f) -the component with frequency f in the result of the spectrum analysis of the normal current signal, and fftc (f) -the component with frequency f in the result of the spectrum analysis of the interference current signal, taking the estimated frequency band interval to be within the range of 50 ± 20Hz as an example, the calculation formula of the interference waveform scale factor λ is:
wherein the content of the first and second substances,
representing the result of summing the energies of the interference current signals at the target frequency band,
representing the result of summing the energies of the normal current signals at the target frequency band.
S306, determining an actual current signal of the switching equipment in the action process based on the interference current signal, the normal current signal and the interference waveform scale factor.
In the practical application process, the current measuring route of the time-division brake coil and the current measuring route of the opening brake coil are arranged at the same position in the practical measurement process, and even are positioned in the same multi-core cable. Moreover, the large current waveforms coupled on the two lines can be approximately considered to be consistent in frequency spectrum and phase, and only obvious difference exists in amplitude, so that the actual current signal can be recorded as I', the normal current signal can be recorded as I, and the interference current signal can be recorded as IiThen, we can approximate: i' ═ I-Lambda Ii。
After determining the interference waveform scale factor in step S304, I- λ I may be determined according to the formula I ═ I- λ IiAnd calculating to obtain an actual current signal of the switching equipment in the action process.
It should be noted that, after obtaining the actual current signal of the switchgear during the action, it can be provided to the corresponding monitoring device for evaluating the status characteristics of the circuit breaker.
Based on the principle, in the signal processing method provided by this embodiment, by utilizing the characteristic that a strong interference signal always exists in two measurement channels of the current of the opening and closing coils in the action process of the switching device, the current signal of the opening and closing coils and the current signal of the closing coil are compared and analyzed to obtain the actual current signal of the switching device in the action process, and the problems that the measured current signal does not have typical characteristics and the intelligent monitoring device of the switching device cannot directly obtain corresponding characteristic parameters to evaluate the state of the circuit breaker due to insufficient field shielding measures are solved.
It is worth to be noted that, in the process of extracting the characteristic parameters of the current waveform of the opening and closing coil by filtering, the existing related scheme also involves the conditioning of the current waveform, but mainly aims at the interference signals in general meaning, such as white noise and the like; unlike the conditions to which this application relates. In addition, the signal conditioning method generally used in the present application is filtering, for example, a smoothing filtering algorithm such as a low pass filter, a band pass filter, and a median filter, and is only applicable to an interference signal such as white noise or an interference frequency band having a frequency band inconsistent with a normal signal frequency band, and is not applicable to the characteristics of the interference signal faced by the present application.
The spectral characteristics of the interference waveform and the normal waveform shown in fig. 8 and 9 in the range of less than 250Hz are combined, and although the frequency band ranges of the two are very close, the existing signal filtering method is not suitable for processing the interference signal caused by the large short-circuit current.
Moreover, the interference signal characteristics of the application are overlapped with the frequency spectrum range of the real waveform from the frequency spectrum, and the filtering based on the frequency only can cause serious distortion to the real signal while filtering the interference signal, and can not be used for evaluating the state of the circuit breaker.
In addition, the influence on the actual current signal to be extracted is further reduced on the basis of inhibiting interference signal components through the frequency spectrum analysis of the signal; and the characteristics that the opening and closing coils of the intelligent monitoring device of the switch equipment adopt different current sensors are reasonably utilized, two paths of signals are comprehensively utilized, and actual current signals to be extracted are restored.
Optionally, in another embodiment provided by the present application, after the step S102 is executed, and whether the opening coil current signal and the closing coil current signal satisfy the interference coupling condition is determined, if it is determined that the opening coil current signal and the closing coil current signal satisfy the interference coupling condition, that is, the determination result is no, please refer to fig. 10, the signal processing method further includes:
s600, extracting the current signal of the switching-on coil and the current signal of the switching-off coil to obtain an actual current signal of the switching equipment in the action process.
In practical application, after the current signal of the opening coil and the current signal of the closing coil are judged to not meet the interference coupling condition, the fact that no interference signal exists in the current signal of the opening coil and the current signal of the closing coil can be shown, the waveform characteristics of the current signal of the opening coil and the current signal of the closing coil can be directly extracted, and the actual current signal of the switching device in the action process can be obtained.
It should be noted that, the specific manner of extracting the current signal of the switching-on coil and the current signal of the switching-off coil to obtain the actual current signal of the switching device in the action process is the same as that in the prior art, and refer to the prior art, which is not described herein again, and all belong to the protection scope of the present application.
Based on the method provided by the above embodiment, corresponding embodiments are provided for the above embodiment, and for convenience of understanding, it is assumed that the switching device is a high-voltage circuit breaker, and the opening coil current signal is IoThe current signal of the closing coil is IcA predetermined threshold value IsWhen the value is 0.3A, the result of the spectrum analysis of the opening coil current signal is FFTO, the result of the spectrum analysis of the closing coil current signal is FFTC, and the component specific modulus value of the opening coil current signal is koThe component specific modulus value of the current signal of the closing coil is kcTaking the power grid frequency as 50Hz as an example, the method specifically comprises the following implementation processes:
1. the high-voltage circuit breaker obtains I through the corresponding acquisition channel in the process of breaking the large currentoAnd Ic。
Wherein, IoAnd IcThe start time and duration of the waveform of (a) need to be consistent.
In particular, IoAnd IcThe details of the waveform of (c) can be as shown in fig. 11.
2. Judgment of Io、IcWhether all exceed Is。
Wherein if the judgment result is over, the judgment result is IoAnd IcAnd (4) coupling the signals with large current interference signals, and executing the step 3.
3. Will IoAnd IcAnd respectively carrying out FFT spectrum analysis to obtain FFTO and FFTC.
In practical applications, if the number of FFT transform points is the same as the number of signal points, FFTO is shown in fig. 12, and FFTC is shown in fig. 13.
4. Comparison IoAnd IcThe interference signal is identified according to the ratio of the power frequency and the direct current component of the waveform.
Defining a parameter k as a mode of the amplitude ratio of the signal waveform power frequency component to the direct current component, namely the calculation formula is as follows:
where FFTX denotes a result of FFT analysis of one signal, FFTX (f 50) denotes a value representing a component having a frequency of 50Hz in the FFT result, and FFTX (f 0) denotes a value representing a direct current component in the FFT result.
Memory koAnd kcAnd the k values of the signals of the opening measuring loop and the closing measuring loop are respectively. Comparison koAnd kcThe larger k is the channel of the interference signal, and the smaller k is the channel containing the normal current waveform.
For the above example, if the resulting k is calculatedo<kcI.e. the switch is open-circuited, IoIs a signal containing the current waveform of the normal opening coil, andcis a large current interference signal.
5. According to IoAnd IcAnd obtaining the interference waveform scale factor.
Because the current measuring line of the opening coil and the current measuring line of the closing coil are arranged at the same position in actual measurement and even in the same multi-core cable, the frequency spectrum and the phase position of the high-current waveform coupled on the two lines are considered to be one due to the approximation of the waveforms of the high-current coupled on the two linesThus, the approximation is believed to be a significant difference only in amplitude, for which the actual current signal is denoted as I, the actual measured signal contains the normal current signal as I, and the actual measured interference current signal is denoted as IiThen, we can approximate:
I'＝I-λIi；
let λ be the interference waveform scale factor.
Specifically, for the assumption in step 4, there are:
Io′＝Io-λIc(ii) a Wherein Io' is the actual current signal sought.
Since the maximum difference between the interference signal and the normal signal is in the component near the power frequency, a smaller frequency band is taken with 50Hz as the center frequency, the energy of the smaller frequency band is summed, then the summed result of the two waveforms is compared and the root sign is taken to obtain the final scale factor λ, and λ can be defined by the following formula, still taking the assumption in step 4 as an example.
Wherein, FFTO (f) -IoThe component of frequency f, FFTC (f) -I, in the FFT analysis result of the waveformcThe component with the frequency f in the FFT analysis result of the waveform, and the estimation frequency band interval takes the range of 50 +/-20 Hz.
6. And extracting to obtain an actual current signal I' by utilizing the interference waveform scale factor lambda.
Wherein the formula I' ═ I- λ I can be usediAnd obtaining the final actual current signal I'.
Specifically, the final waveform diagram of the actual current signal I' may be as shown in fig. 14, which can achieve an ideal expectation, and may be subjected to subsequent waveform processing to extract corresponding characteristic parameters to evaluate the state characteristics of the circuit breaker.
Based on the above, can understand that, this application sets out to the interference signal frequency spectrum characteristic of the big current adverse circumstances of high voltage circuit breaker break-make short circuit current in-process, and make full use of divides, closes a floodgate coil current acquisition passageway and can not have the characteristics of normal coil current simultaneously, and two passageway data of make full use of extract the coupling has the normal signal of interference, and the actual measurement result shows that the effect of extracting is excellent, can satisfy subsequent current waveform characteristic and draw to aassessment circuit breaker state.
The embodiment of the present application still provides a switchgear intellectual detection system device, switchgear intellectual detection system device is in the monitoring process of execution to switchgear, includes: for performing the signal processing method as provided in any of the embodiments above.
It should be noted that the intelligent monitoring device for the switchgear is generally used for monitoring the state parameters of the switchgear, such as a circuit breaker, and can acquire signals of related analog quantity and digital quantity, and calculate corresponding characteristic parameters for the parameters to evaluate the health state of the switchgear.
It should be further noted that, for the related description of the signal processing method, reference may be made to the embodiments corresponding to fig. 3 to fig. 14, which is not described herein again; for the intelligent monitoring device of the switch device, reference may be made to the prior art, and details are not repeated here.
The embodiment of the present application further provides a storage medium for storing a computer program, and when the computer program is executed, the computer program is specifically used for implementing the signal processing method provided by the embodiment of the present application.
It should be noted that, for the related description of the signal processing method, reference may be made to the embodiments corresponding to fig. 3 to fig. 14, and details are not described herein again.
An embodiment of the present application further provides an electronic device, please refer to fig. 15, including: a memory 601 and a processor 602.
The memory 601 is used for storing computer programs.
The processor 602 is configured to execute the computer program, and is specifically configured to implement the signal processing method provided in the embodiment of the present application.
It should be noted that, for the related description of the signal processing method, reference may be made to the embodiments corresponding to fig. 3 to fig. 14, and details are not described herein again.
Features described in the embodiments in the present specification may be replaced with or combined with each other, and the same and similar portions among the embodiments may be referred to each other, and each embodiment is described with emphasis on differences from other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A signal processing method, comprising:
respectively acquiring a switching-off coil current signal and a switching-on coil current signal of the switching equipment in the action process of the switching equipment;
judging whether the current signal of the opening coil and the current signal of the closing coil meet interference coupling conditions or not;
if the judgment result is yes, comparing and analyzing the opening coil current signal and the closing coil current signal to obtain an actual current signal of the switching equipment in the action process.
2. The signal processing method of claim 1, wherein obtaining an opening coil current signal and a closing coil current signal of the switching device comprises:
sampling the current of a brake separating coil of the switch equipment to obtain a current signal of the brake separating coil;
and sampling the current of a closing coil of the switching equipment to obtain a current signal of the closing coil.
3. The signal processing method of claim 1, wherein determining whether the opening coil current signal and the closing coil current signal satisfy an interference coupling condition comprises:
judging whether the current signal of the opening coil and the current signal of the closing coil are both larger than a preset threshold value;
if the current signal of the opening coil and the current signal of the closing coil are both larger than the preset threshold value, the current signal of the opening coil and the current signal of the closing coil are judged to meet the interference coupling condition;
and if at least one of the opening coil current signal and the closing coil current signal is judged to be not larger than the preset threshold value, judging that the opening coil current signal and the closing coil current signal do not meet the interference coupling condition.
4. The signal processing method of claim 1, wherein comparing and analyzing the opening coil current signal and the closing coil current signal to obtain an actual current signal of the switching device during an operation process comprises:
respectively carrying out spectrum analysis on the opening coil current signal and the closing coil current signal to obtain a spectrum analysis result of the opening coil current signal and a spectrum analysis result of the closing coil current signal;
according to the frequency spectrum analysis result, identifying an interference current signal generating an interference signal and a normal current signal not generating the interference signal in the opening coil current signal and the closing coil current signal;
determining an interference waveform scaling factor based on the interference current signal and the normal current signal;
and determining an actual current signal of the switching equipment in the action process based on the interference current signal, the normal current signal and the interference waveform scale factor.
5. The signal processing method according to claim 4, wherein the discriminating, from the result of the spectrum analysis, the interference current signal generating the interference signal and the normal current signal not generating the interference signal among the opening coil current signal and the closing coil current signal comprises:
determining a component ratio module value of the current signal of the opening coil and a component ratio module value of the current signal of the closing coil according to a frequency spectrum analysis result of the current signal of the opening coil and a frequency spectrum analysis result of the current signal of the closing coil respectively; the component ratio module value is a module of the amplitude ratio of the work frequency component and the direct current component in the corresponding current signal;
and taking the current signal corresponding to the larger component ratio module value as the interference current signal and taking the current signal corresponding to the smaller component ratio module value as the normal current signal in the component ratio module value of the opening coil current signal and the component ratio module value of the closing coil current signal.
6. The signal processing method of claim 4, wherein determining an interference waveform scaling factor based on the interference current signal and the normal current signal comprises:
respectively determining energy summation results of the interference current signal and the normal current signal under a target frequency band;
and comparing the energy summation results of the two and carrying out evolution operation to obtain the interference waveform scale factor.
7. The signal processing method of claim 4, wherein determining the actual current signal of the switching device during the action based on the interference current signal, the normal current signal and the interference waveform scaling factor comprises:
according to the formula I ═ I- λ IiCalculating to obtain an actual current signal of the switching equipment in the action process;
wherein I' represents the action process of the switch deviceI denotes the normal current signal, IiRepresenting the interference current signal and lambda representing the interference waveform scaling factor.
8. The utility model provides a switchgear intellectual detection system device, its characterized in that, switchgear intellectual detection system device includes in carrying out the monitoring process to switchgear: for performing the signal processing method according to any of the claims 1-7 above.
9. An electronic device, comprising: a memory and a processor;
wherein the memory is for storing a computer program;
the processor is configured to execute the computer instructions stored by the memory, in particular to perform the signal processing method according to any one of claims 1 to 7.
10. A storage medium for storing a computer program which, when executed, implements the signal processing method of any one of claims 1-7.
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| DE102022210180A1 (en) | 2022-09-27 | 2024-03-28 | Siemens Mobility GmbH | Monitoring the correct function of a main switch on a rail vehicle |
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