CN113706840A - Partial discharge ultrahigh frequency monitoring grading alarm circuit and alarm device and method thereof - Google Patents
Partial discharge ultrahigh frequency monitoring grading alarm circuit and alarm device and method thereof Download PDFInfo
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- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
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- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1245—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings
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Abstract
The application relates to a partial discharge ultrahigh frequency monitoring grading alarm circuit and an alarm method and device thereof. The partial discharge ultrahigh frequency monitoring and grading alarm circuit comprises an ultrahigh frequency signal acquisition module, a partial discharge ultrahigh frequency signal acquisition module and a partial discharge ultrahigh frequency signal acquisition module, wherein the ultrahigh frequency signal acquisition module is used for acquiring ultrahigh frequency partial discharge signals in a preset space; the ultrahigh frequency signal processing module is electrically connected with the ultrahigh frequency signal acquisition module and is used for preprocessing the ultrahigh frequency partial discharge signal to generate a target frequency band signal; and the alarm module is electrically connected with the ultrahigh frequency signal processing module and used for acquiring the maximum frequency value of the target frequency band signal according to a preset algorithm, comparing the maximum frequency value with a frequency threshold range corresponding to at least one alarm grade and generating an alarm signal corresponding to the alarm grade according to a comparison result. The method and the device can monitor the partial discharge ultrahigh frequency signal, alarm in a grading way and send the short message, and have the advantages of small data volume, high processing speed, simple hardware, low cost, strong anti-interference and the like.
Description
Technical Field
The application relates to the technical field of equipment monitoring, in particular to a partial discharge ultrahigh frequency monitoring grading alarm circuit and an alarm method and device thereof.
Background
In the case of an electric power equipment, there are a large number of insulators, and these insulators have a phenomenon that, due to problems such as long-term withstand voltage and manufacturing process, when a voltage is applied to a field intensity generated in the electric equipment, discharge occurs only in an insulating partial region, but a fixed discharge path is not formed in a discharge region, and this phenomenon is called partial discharge.
Partial discharges lead to a vicious cycle of deterioration and defects of the insulation of the electrical equipment and, in severe cases, even to insulation accidents. Therefore, the sudden insulation damage accident of the power equipment in the running process can be avoided by detecting the partial discharge.
However, most of the conventional detection methods are pattern recognition methods, and pattern recognition is to distinguish the categories of the research objects by using a certain analysis algorithm according to different characteristics or attributes of the research objects. In brief, pattern recognition is the study of automatic techniques, whereby the computation relies on the automatic techniques to assign the patterns to be recognized to the respective associated patterns. However, this method needs to collect a large amount of information data to perform mode discrimination, and has a large data volume and high processing difficulty.
Disclosure of Invention
In view of the above, there is a need to provide a partial discharge ultrahigh frequency monitoring classification alarm circuit, and an alarm method and device thereof.
In order to achieve the above and other objects, an aspect of the present application provides a partial discharge ultrahigh frequency monitoring and grading alarm circuit, including an ultrahigh frequency signal acquisition module, an ultrahigh frequency signal processing module and an alarm module, where the ultrahigh frequency signal acquisition module is configured to acquire an ultrahigh frequency partial discharge signal in a preset space; the ultrahigh frequency signal processing module is electrically connected with the ultrahigh frequency signal acquisition module and is used for preprocessing the ultrahigh frequency partial discharge signal to generate a target frequency band signal; the alarm module is electrically connected with the ultrahigh frequency signal processing module and used for acquiring the maximum frequency value of the target frequency band signal according to a preset algorithm, comparing the maximum frequency value with a frequency threshold range corresponding to at least one alarm grade, and generating an alarm signal corresponding to the alarm grade according to the comparison result.
In the partial discharge ultrahigh frequency monitoring and grading alarm circuit in the embodiment, because the ultrahigh frequency signal is less attenuated during propagation and can effectively avoid the interference of field corona and the like, the required ultrahigh frequency signal is acquired by arranging the ultrahigh frequency signal acquisition module, so that the detection sensitivity is improved and the ultrahigh frequency monitoring and grading alarm circuit has stronger interference capability. The collected ultrahigh frequency signal is transmitted to the ultrahigh frequency signal processing module for filtering, amplifying and other processing, so that the ultrahigh frequency signal can meet the frequency range which can be processed by the alarm module, and partial peak value or phase and other characteristics of the ultrahigh frequency signal are reserved, thereby achieving the subsequent detection and processing capability of the local discharge ultrahigh frequency signal, optimizing the processing function and reducing the subsequent data processing difficulty. And continuously sending the preprocessed data to an alarm module, acquiring, recording and comparing the data with a threshold value, judging whether the data is in the threshold value range, and sending an alarm signal, so that a worker can intuitively judge the partial discharge condition immediately according to the alarm signal.
In one embodiment, the uhf signal acquisition module includes an uhf antenna sensor, and the uhf antenna sensor is electrically connected to the uhf signal processing module and is used for acquiring an uhf partial discharge signal in a preset space, so as to accurately acquire an uhf signal.
In one embodiment, the ultrahigh frequency signal processing module comprises a band-pass filter, a high frequency amplifier and a detector. The band-pass filter is electrically connected with the ultrahigh frequency antenna sensor and is used for acquiring ultrahigh frequency signals in a preset frequency band; the high-frequency amplifier is electrically connected with the band-pass filter and is used for carrying out low-noise differential amplification on the ultrahigh-frequency signal so as to obtain a high-frequency amplified signal; the detector is electrically connected with the high-frequency amplifier and used for generating a target frequency band signal with an envelope waveform changing along with the high-frequency amplified signal according to the high-frequency amplified signal, wherein the target frequency band signal is the envelope signal of the high-frequency amplified signal. The low-frequency information is effectively filtered and partial peak value or phase position and other characteristics are reserved, so that the ultrahigh-frequency signal can meet the frequency range which can be processed by the alarm module, and the subsequent detection and processing capability of the local discharge ultrahigh-frequency signal is achieved.
In one embodiment, the band pass filter has an order of 7; the resistance value of the detector is 19k omega-21 k omega, and the capacitance value of the detector is 0.015 mu F-0.025 mu F. So as to effectively filter partial interference and extract accurate ultrahigh frequency signals; the speed of discharging the capacitor is not less than the speed of falling of the envelope curve of the input signal, and the conditions of the resistor and the capacitor in the detection circuit are met.
In one embodiment, the alarm module comprises a sampler and a control chip, wherein the sampler is electrically connected with the ultrahigh frequency signal acquisition module and is used for acquiring a target sampling signal according to the target frequency band signal; the control chip is electrically connected with the sampler and used for acquiring the maximum frequency value of the target sampling signal according to a preset algorithm, comparing the maximum frequency value with frequency threshold value ranges corresponding to a plurality of different alarm levels, and generating an alarm signal corresponding to the alarm level according to the comparison result. The ultrahigh frequency signals generated by the partial discharge of different types of insulation defects have different pulse amplitudes, numbers, phase distribution and frequency spectrums. Therefore, the control chip is arranged to collect various types of discharge data of the electrical equipment, each maximum frequency value of various discharge types is extracted according to a preset algorithm, and each extracted maximum frequency value is analyzed to represent threshold values of different discharge grades. And comparing the signal processed by the ultrahigh frequency signal processing module collected by the sampler with a threshold value so as to rapidly judge the alarm level and the type of the insulation defect.
In one embodiment, the alarm module further comprises an alarm device, wherein the alarm device is connected with the control chip and used for executing a preset alarm action according to the alarm signal; the preset alarm action comprises at least one of sending an alarm sound, an alarm light and an alarm short message corresponding to the alarm grade. So that the staff can judge the discharging condition in time and visually according to the sound, light or short message reminding.
In one embodiment, the alarm signal comprises a primary alarm, a secondary alarm and a tertiary alarm for indicating that the partial discharge intensity is gradually increased; the frequency threshold ranges include a first frequency threshold range corresponding to a primary alarm, a second frequency threshold range corresponding to a secondary alarm, and a third frequency threshold range corresponding to a tertiary alarm. So that the staff can take corresponding measures according to the alarm grade.
In one embodiment, the alert device is configured to: emitting a yellow alarm light according to the received primary alarm; emitting an orange alarm light according to the received secondary alarm; and emitting red alarm light according to the received tertiary alarm. So that the staff can judge the alarm level according to the light color, know the discharge condition and make corresponding measures.
Another aspect of the present application provides a hierarchical alarm device of partial discharge ultrahigh frequency monitoring, including: a housing having a cavity therein; and the partial discharge ultrahigh frequency monitoring grading alarm circuit in any embodiment of the application is at least partially positioned in the cavity.
In the storage device in the above embodiment, the antenna sensing surface is arranged to collect signals conveniently, so that the ultrahigh frequency signal acquisition module effectively acquires ultrahigh frequency signals, and thus the local discharge ultrahigh frequency monitoring and grading alarm device effectively avoids interference such as field corona during use. The ultrahigh frequency signal processing module is arranged to filter, amplify and the like the acquired ultrahigh frequency signal, so that the ultrahigh frequency signal can meet the frequency range which can be processed by the alarm module, and partial peak value or phase and other characteristics of the ultrahigh frequency signal are reserved, thereby achieving the subsequent detection and processing capability of the local discharge ultrahigh frequency signal, optimizing the processing function and reducing the subsequent data processing difficulty. The alarm module is arranged to collect and record the preprocessing signals and compare the preprocessing signals with the threshold values to send out the indicator lights with different colors, so that the staff can judge the alarm level visually according to the colors of the indicator lights.
In another aspect, the present application provides a partial discharge ultrahigh frequency monitoring and grading alarm method, including: collecting ultrahigh frequency partial discharge signals in a preset space; preprocessing the ultrahigh frequency partial discharge signal to generate a target frequency band signal; and acquiring the maximum frequency value of the target frequency band signal according to a preset algorithm, comparing the maximum frequency value with a frequency threshold range corresponding to at least one alarm grade, and generating an alarm signal corresponding to the alarm grade according to a comparison result.
In the data storage control method in the above embodiment, the ultrahigh frequency partial discharge signal in the preset space is collected, so that data detection is facilitated and interferences such as field corona and the like are effectively avoided. The ultrahigh frequency partial discharge signal is preprocessed, so that extremely tiny signals collected by the ultrahigh frequency antenna sensor are amplified, low-frequency signals are filtered, and partial peak values or phases and other characteristics of the signals are reserved, so that the accuracy of data is improved, and the difficulty of processing the data is reduced. The maximum frequency value of the target frequency band signal is obtained according to a preset algorithm, the maximum frequency value is compared with a frequency threshold range corresponding to at least one alarm grade, and an alarm device judges an alarm signal according to a comparison result, so that a preset alarm action is made, and a worker can quickly judge the discharge condition according to the alarm action.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a partial discharge ultrahigh frequency monitoring hierarchical alarm circuit provided in a first embodiment of the present application;
fig. 2 is a schematic structural diagram of a partial discharge ultrahigh frequency monitoring classification alarm circuit provided in a second embodiment of the present application;
fig. 3 is a schematic structural diagram of a partial discharge ultrahigh frequency monitoring classification alarm circuit provided in a third embodiment of the present application;
fig. 4 is a diagram of input and output signals when a resistance value of a demodulator in a partial discharge ultrahigh frequency monitoring and grading alarm circuit is 20k Ω and a capacitance value is 0.02 μ F provided in the third embodiment of the present application;
fig. 5 is a schematic structural diagram of a partial discharge ultrahigh frequency monitoring classification alarm circuit provided in a fourth embodiment of the present application;
fig. 6 is a schematic structural diagram of a partial discharge ultrahigh frequency monitoring classification alarm circuit provided in a fifth embodiment of the present application;
FIG. 7 is a schematic structural diagram of an exemplary partial discharge UHF monitoring and alarm device;
FIG. 8 is a flowchart illustrating an exemplary partial discharge UHF monitoring and alarm method.
Description of reference numerals:
100. a partial discharge ultrahigh frequency monitoring and grading alarm circuit; 10. an ultrahigh frequency signal acquisition module; 20. an ultrahigh frequency signal processing module; 30. an alarm module; 101. an ultrahigh frequency antenna sensor; 201. a band-pass filter; 202. a high-frequency amplifier; 203. a detector; 301. a sampler; 302. a control chip; 303. an alarm device; 200. a partial discharge ultrahigh frequency monitoring and grading alarm device; 1. a housing; 2. a cavity; 3. a cable; 4. an antenna sensing surface; 5. and an indicator light.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
Partial discharge is a discharge phenomenon in a local area in an insulation structure of a switch cabinet, and the discharge is caused by the fact that insulation is broken down in a local area, and the insulation is not broken down in a penetrating way. The partial discharge of the switch cabinet is found in time, the insulation further damage of the switch cabinet is effectively avoided, the existing detection system collects a large amount of information data to perform mode discrimination, the data volume is large, the processing difficulty is high, and the high accuracy rate is ensured but the on-site detection alarm cannot be met.
Based on this, please refer to fig. 1, in an embodiment of the present application, a partial discharge ultrahigh frequency monitoring and grading alarm circuit 100 is provided, which includes an ultrahigh frequency signal acquisition module 10, an ultrahigh frequency signal processing module 20 and an alarm module 30, where the ultrahigh frequency signal acquisition module 10 is electrically connected to the ultrahigh frequency signal processing module 20, and the alarm module 30 is electrically connected to the ultrahigh frequency signal processing module 20. The ultrahigh frequency signal acquisition module 10 is configured to acquire an ultrahigh frequency partial discharge signal in a preset space, the ultrahigh frequency signal processing module 20 is configured to preprocess the ultrahigh frequency partial discharge signal to generate a target frequency band signal, and the alarm module 30 is configured to acquire a maximum frequency value of the target frequency band signal according to a preset algorithm, compare the maximum frequency value with a frequency threshold range corresponding to at least one alarm level, and generate an alarm signal corresponding to the alarm level according to a comparison result.
As an example, referring to fig. 1, since the attenuation of the uhf signal is small during propagation and the interference such as field corona can be effectively avoided, the uhf signal acquisition module 10 is provided to acquire a desired uhf signal, so that the detection sensitivity is high and the interference capability is strong. The collected ultrahigh frequency signal is transmitted to the ultrahigh frequency signal processing module 20 for processing such as filtering and amplifying, so that the ultrahigh frequency signal can meet the frequency range which can be processed by the alarm module 30, and partial characteristics such as peak value or phase position of the ultrahigh frequency signal are retained, thereby achieving the subsequent detection and processing capability of the local discharge ultrahigh frequency signal, optimizing the processing function and reducing the subsequent data processing difficulty. The preprocessed data is continuously sent to the alarm module 30, collected, recorded and compared with a threshold value, whether the data is in the threshold value range is judged, and an alarm signal is sent out, so that a worker can intuitively judge the partial discharge condition immediately according to the alarm signal.
As an example, referring to fig. 2, in an embodiment of the present application, the uhf signal acquisition module 10 includes an uhf antenna sensor 101 electrically connected to the uhf signal processing module 20 for acquiring an uhf partial discharge signal in a predetermined space. So as to accurately acquire the ultrahigh frequency signal.
Referring to fig. 3, in an embodiment of the present application, the uhf signal processing module 20 includes a band pass filter 201, a hf amplifier 202, and a wave detector 203. Filtering out low-frequency information by setting a band-pass filter 201 to obtain ultrahigh-frequency signals within 300 MHz-1000 MHz; the high frequency amplifier 202 is electrically connected to the band pass filter 201, and since the power of the partial discharge signal received by the uhf antenna sensor 101 is between about-85 dBm and-15 dBm, and the sensitivity of the subsequent envelope detection circuit is not higher than-40 dBm, the uhf signal needs to be differentially amplified with low noise to obtain a high frequency amplified signal; the detector 203 is electrically connected to the high-frequency amplifier 202, and is configured to generate a target frequency band signal with an envelope waveform varying with the high-frequency amplified signal according to the high-frequency amplified signal, and effectively retain characteristics such as a partial peak value or a phase thereof, so that the ultrahigh-frequency signal can satisfy a frequency range that can be processed by the alarm module 30, thereby achieving subsequent detection and processing capabilities of the partial discharge ultrahigh-frequency signal.
Specifically, in the partial discharge ultrahigh frequency monitoring and grading alarm circuit 100 in the above embodiment, please refer to fig. 3 again, the high frequency amplifier 202 is selected from ZKL-1R5, each of which has good performance, adopts differential amplification, has high common mode rejection ratio, and has a gain of 40dB, so as to amplify the partial discharge signal. The band-pass filter 201 is designed based on a Chebyshev I-type filter, and because the amplitude response of the Chebyshev I-type filter is equi-ripple in a pass band and is monotonous in a stop band, a simulation structure shows that partial interference can be effectively filtered, and the extracted ultrahigh frequency signal can meet the design requirement. The design steps are as follows: step 1, according to the signal characteristics of partial discharge measured by a ultrahigh frequency detection method, firstly determining the bandwidth, wherein the lower cut-off frequency fl of a frequency band is 300MHz, and the lower stop band frequency fls is 240 MHz; the upper cut-off frequency fh is 1500MHz, and the upper stop band frequency fhs is 300 MHz; the center frequency f0 is 900MHz, and the bandwidth BW is 1200 MHz. Then determining the minimum attenuation of the stop band, and taking the value As equal to 30 dB; the passband ripple value is δ is 0.5dB, then the parameter e about the passband ripple is 0.023, and the larger e, the larger the ripple, 0< e < 1; and 2, obtaining the applicable order n of the Chebyshev I-type filter through the passband break frequency omega _0, the stop band starting frequency omega _ S, the passband ripple delta and the stop band minimum attenuation A _ S. The order of the band-pass filter 201 is finally determined to be 7 orders, which can meet the design requirement. The detector 203 needs to select appropriate RC parameters to satisfy the requirements of no distortion and maximum peak relative error, i.e. the output envelope waveform follows the variation of the input signal, and the envelope is the curve of the amplitude of the random process along with the variation of time. The detector 203 is designed as follows: step 1, taking the R value as a fixed value of 10k omega, changing the C value, taking C as 0.002 muF, 0.02 muF and 0.1 muF, detecting the input and output waveforms by an oscilloscope, and observing to obtain that when C is 0.02 muF, the waveform of the output signal is the envelope detection of the input signal, and the waveform of the output voltage always changes along with the change of the envelope of the input signal; step 2, taking the value of C as a fixed value of 0.02 muF, changing the value of R, taking R as 1k omega, 20k omega and 50k omega, obtaining input and output by an oscilloscope, and obtaining an output signal as an envelope signal of an input signal by observation when R is 20k omega; step 3, the simulation experiment can obtain: when R is 20k Ω and C is 0.02 μ F, the rate of discharge of the capacitor C is not less than the rate of fall of the envelope of the input signal, and the condition of R, C in the detector circuit is satisfied, and the waveform is as shown in fig. 4. Therefore, the resistance value of the detector 203 is 19k omega-21 k omega, and the capacitance value of the detector 203 is 0.015 mu F-0.025 mu F.
Referring to fig. 5, for example, in an embodiment of the present application, the alarm module 3030 includes a sampler 301 and a control chip 302. The sampler 301 is electrically connected to the ultrahigh frequency signal acquisition module 10, and is configured to obtain a target sampling signal according to the target frequency band signal; the control chip 302 is electrically connected to the sampler 301, and is configured to obtain a maximum frequency value of the target sampling signal according to a preset algorithm, compare the maximum frequency value with frequency threshold ranges corresponding to multiple different alarm levels, and generate an alarm signal corresponding to the alarm level according to a comparison result. The ultrahigh frequency signals generated by the partial discharge of different types of insulation defects have different pulse amplitudes, numbers, phase distribution and frequency spectrums. Therefore, the control chip 302 is arranged to collect various types of discharge data of the electrical equipment, each maximum frequency value of various discharge types is extracted according to a preset algorithm, and each extracted maximum frequency value is analyzed to represent threshold values of different discharge grades. And then, the signal which is acquired by the sampler 301 and processed by the ultrahigh frequency signal processing module 20 is compared with a threshold value, so that the alarm level can be quickly judged, and the type of the insulation defect can be judged.
Specifically, in the partial discharge ultrahigh frequency monitoring and grading alarm circuit 100 in the above embodiment, please refer to fig. 5, by collecting various types of discharge data in the preset space, the upper computer FFT algorithm extracts the maximum value of each frequency point of each discharge type, and analyzes the extracted maximum value of each frequency point to obtain the threshold values, such as the first frequency threshold value, the second frequency threshold value, and the third frequency threshold value, that can represent different discharge grades. The FFT algorithm is a fast algorithm of discrete fourier transform, which can transform a signal into the frequency domain and extract the spectrum of a signal, and some signals are difficult to see what features in the time domain, but if transformed into the frequency domain, the features are easy to see. Therefore, FFT is used, ultrahigh frequency single waveforms of different discharge types in a preset space are collected through an oscilloscope, then the collected data set is extracted from an upper computer according to FFT algorithm to obtain the maximum value of each frequency point in each discharge type, finally the maximum value of each discharge type in each frequency point is analyzed through a mean value algorithm, and the corresponding mean value is taken to represent the parameters of different discharge grades: a first frequency threshold, a second frequency threshold, and a third frequency threshold.
As an example, referring to fig. 6, in an embodiment of the present application, an alarm device 303 is connected to the control chip 302, and is configured to execute a preset alarm action according to the alarm signal; the preset alarm action comprises at least one of sending an alarm sound, an alarm light and an alarm short message corresponding to the alarm grade, so that a worker can judge the discharge condition timely and intuitively according to the sound, the light or the short message prompt.
Further, in one embodiment of the present application, the alarm signal includes a primary alarm, a secondary alarm and a tertiary alarm for indicating that the partial discharge intensity is gradually increased; the frequency threshold ranges include a first frequency threshold range corresponding to a primary alarm, a second frequency threshold range corresponding to a secondary alarm, and a third frequency threshold range corresponding to a tertiary alarm. Emitting a yellow alarm light according to the received primary alarm; emitting an orange alarm light according to the received secondary alarm; and emitting red alarm light according to the received three-level alarm. It should be noted that, in other embodiments, an alarm whistle may also be issued according to the received primary alarm; sending out a second alarm whistle according to the received second-level alarm; and sending out a three-tone alarm whistle according to the received three-level alarm. Or sending corresponding first-level, second-level and third-level short messages to the mobile phone end or the computer end according to the first-level alarm, the second-level alarm and the third-level alarm.
By way of example, referring to fig. 7, in one embodiment of the present application, there is provided a partial discharge ultrahigh frequency monitoring graded alarm device 200, which includes a housing 1, a built-in cavity 2 and a partial discharge ultrahigh frequency monitoring graded alarm circuit 100 described in any of the embodiments of the present application. The antenna sensing surface 4 is arranged to collect signals conveniently, so that the ultrahigh frequency signal acquisition module 10 can effectively acquire ultrahigh frequency signals, and the local discharge ultrahigh frequency monitoring and grading alarm device can effectively avoid field corona and other interferences in use. The ultrahigh frequency signal processing module 20 is arranged to filter and amplify the acquired ultrahigh frequency signal, so that the ultrahigh frequency signal can meet the frequency range which can be processed by the alarm module 30, and partial characteristics of a peak value or a phase and the like of the ultrahigh frequency signal are reserved, thereby achieving the subsequent detection and processing capability of the local discharge ultrahigh frequency signal, optimizing the processing function and reducing the subsequent data processing difficulty. The alarm module 30 is arranged to collect and record the preprocessing signals and compare the preprocessing signals with a threshold value to send out the indicator lamps 5 with different colors, so that a worker can judge the alarm level visually according to the colors of the indicator lamps 5.
By way of example, referring to fig. 8, in an embodiment of the present application, there is provided a partial discharge ultrahigh frequency monitoring hierarchical alarm method applied to a partial discharge ultrahigh frequency monitoring hierarchical alarm circuit 100, the method including:
step S10: collecting ultrahigh frequency partial discharge signals in a preset space;
step S20: preprocessing the ultrahigh frequency partial discharge signal to generate a target frequency band signal;
step S30: and acquiring the maximum frequency value of the target frequency band signal according to a preset algorithm, comparing the maximum frequency value with a frequency threshold range corresponding to at least one alarm grade, and generating an alarm signal corresponding to the alarm grade according to a comparison result.
Specifically, the attenuation of ultrahigh frequency electromagnetic wave signals generated by partial discharge of electrical equipment is small during propagation, the electromagnetic waves are reflected at discontinuous parts such as insulators in the equipment and the like, resonance is caused in a cavity of the equipment, and the oscillation time of the partial discharge signals is prolonged; the corona discharge interference of high-voltage lines and equipment in the air is the most common interference on site, the frequency of electromagnetic waves generated by discharge is mainly below 200MHz, and the frequency band of ultrahigh frequency signals is usually 300M-3000 MHz. Therefore, the ultrahigh frequency partial discharge signals in the preset space are collected, so that data detection is facilitated, and interferences such as field corona and the like are effectively avoided. Since the collected signals of the ultrahigh frequency collecting module 10 are all extremely tiny signals of millivolt level, the amplitude of the signals obtained by the ultrahigh frequency antenna sensor 101 needs to be amplified by the high frequency amplifier 202; the collected signals not only have 300M-3000 MHz but also have some low-frequency signals, and in order to reduce the data volume, the signals need to be filtered by a band-pass filter 201; in order to process the data of the sampler 301 quickly and conveniently, the detector 203 is required to retain part of the peak value or phase characteristics. Therefore, the ultrahigh frequency signal processing module 20 preprocesses the ultrahigh frequency partial discharge signal, so that the ultrahigh frequency signal can satisfy the frequency range which can be processed by the alarm module 30. In order to enable workers to judge different discharging conditions intuitively and quickly according to alarm signals, ultrahigh-frequency single waveforms of various discharging types in the collecting equipment are extracted through a preset algorithm, maximum values of various frequency points are represented as different threshold value ranges, and the maximum values are set as a primary alarm threshold value range, a secondary alarm threshold value range and a tertiary alarm threshold value range according to the gradual increase of the local discharging intensity. And comparing the collected ultrahigh frequency signal with a frequency threshold range corresponding to at least one alarm grade according to a preset algorithm, and making a preset alarm action according to the received alarm, wherein the preset alarm action comprises at least one of sending an alarm sound, an alarm light and an alarm short message corresponding to the alarm grade. The alarm signal for example emits a yellow alarm light in response to receiving a primary alarm; emitting an orange alarm light according to the received secondary alarm; and emitting red alarm light according to the received three-level alarm. Or sending out an alarm whistle according to the received primary alarm; sending out a second alarm whistle according to the received second-level alarm; and sending out a three-tone alarm whistle according to the received three-level alarm. Or sending corresponding first-level, second-level and third-level short messages to the mobile phone end or the computer end according to the first-level alarm, the second-level alarm and the third-level alarm.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A partial discharge ultrahigh frequency monitoring grading alarm circuit is characterized by comprising:
the ultrahigh frequency signal acquisition module is used for acquiring ultrahigh frequency partial discharge signals in a preset space;
the ultrahigh frequency signal processing module is electrically connected with the ultrahigh frequency signal acquisition module and is used for preprocessing the ultrahigh frequency partial discharge signal to generate a target frequency band signal;
and the alarm module is electrically connected with the ultrahigh frequency signal processing module and used for acquiring the maximum frequency value of the target frequency band signal according to a preset algorithm, comparing the maximum frequency value with a frequency threshold range corresponding to at least one alarm grade and generating an alarm signal corresponding to the alarm grade according to a comparison result.
2. The alarm circuit of claim 1, wherein the uhf signal acquisition module comprises:
and the ultrahigh frequency antenna sensor is electrically connected with the ultrahigh frequency signal processing module and is used for acquiring ultrahigh frequency partial discharge signals in a preset space.
3. The alarm circuit of claim 2, wherein the uhf signal processing module comprises:
the band-pass filter is electrically connected with the ultrahigh frequency antenna sensor and is used for acquiring ultrahigh frequency signals in a preset frequency band;
the high-frequency amplifier is electrically connected with the band-pass filter and is used for carrying out low-noise differential amplification on the ultrahigh-frequency signal so as to obtain a high-frequency amplified signal;
and the detector is electrically connected with the high-frequency amplifier and used for generating a target frequency band signal with an envelope waveform changing along with the high-frequency amplified signal according to the high-frequency amplified signal, wherein the target frequency band signal is the envelope signal of the high-frequency amplified signal.
4. The alarm circuit of claim 3, wherein the band-pass filter has an order of 7; the resistance value of the detector is 19k omega-21 k omega, and the capacitance value of the detector is 0.015 mu F-0.025 mu F.
5. The alarm circuit of any one of claims 1-4, wherein the alarm module comprises:
the sampler is electrically connected with the ultrahigh frequency signal acquisition module and is used for acquiring a target sampling signal according to the target frequency band signal;
and the control chip is electrically connected with the sampler and used for acquiring the maximum frequency value of the target sampling signal according to a preset algorithm, comparing the maximum frequency value with frequency threshold value ranges corresponding to a plurality of different alarm levels, and generating an alarm signal corresponding to the alarm level according to the comparison result.
6. The alarm circuit of claim 5, wherein the alarm module further comprises:
the alarm device is connected with the control chip and used for executing preset alarm action according to the alarm signal;
the preset alarm action comprises at least one of sending an alarm sound, an alarm light and an alarm short message corresponding to the alarm grade.
7. The alarm circuit of claim 6, wherein the alarm signal comprises a primary alarm, a secondary alarm and a tertiary alarm for indicating a gradual increase in partial discharge intensity;
the frequency threshold ranges include a first frequency threshold range corresponding to a primary alarm, a second frequency threshold range corresponding to a secondary alarm, and a third frequency threshold range corresponding to a tertiary alarm.
8. The alarm circuit of claim 7, wherein the alarm device is configured to:
emitting a yellow alarm light according to the received primary alarm;
emitting an orange alarm light according to the received secondary alarm;
and emitting red alarm light according to the received tertiary alarm.
9. The utility model provides a hierarchical alarm device of partial discharge superfrequency monitoring which characterized in that includes:
a housing having a cavity therein;
and a partial discharge uhf monitoring stage alarm circuit as claimed in any one of claims 1 to 8, located at least partially within the cavity.
10. A partial discharge ultrahigh frequency monitoring and grading alarm method is characterized by comprising the following steps:
collecting ultrahigh frequency partial discharge signals in a preset space;
preprocessing the ultrahigh frequency partial discharge signal to generate a target frequency band signal;
and acquiring the maximum frequency value of the target frequency band signal according to a preset algorithm, comparing the maximum frequency value with a frequency threshold range corresponding to at least one alarm grade, and generating an alarm signal corresponding to the alarm grade according to a comparison result.
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