CN113552456A - Switch cabinet partial discharge intensity monitoring method and device and storage medium - Google Patents
Switch cabinet partial discharge intensity monitoring method and device and storage medium Download PDFInfo
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Abstract
The invention discloses a method, equipment and a storage medium for monitoring partial discharge intensity of a switch cabinet, wherein the method comprises the following steps: acquiring an ultrasonic signal acquired by an ultrasonic sensor; performing Fourier transform on the ultrasonic signal to obtain a spectrogram corresponding to the ultrasonic signal; according to the spectrogram, carrying out frequency band division on the ultrasonic signals; calculating the energy ratio of the ultrasonic energy corresponding to each frequency band in the whole frequency range of the ultrasonic signal, and taking the energy ratio as a frequency response value; and calculating the apparent discharge amount corresponding to each frequency band according to the frequency response value of each frequency band, and judging the change trend of the local discharge intensity of the switch cabinet according to each apparent discharge amount. The invention solves the technical problem that the partial discharge strength of the switch cabinet cannot be effectively measured in the prior art.
Description
Technical Field
The invention relates to the technical field of switch cabinet discharge monitoring, in particular to a switch cabinet partial discharge intensity monitoring method, device and storage medium.
Background
The electrical equipment inevitably generates some insulation defects, such as air gaps, impurities and the like, in the manufacturing, installation or operation process, the insulation defects can cause the electric field distribution in the dielectric medium to be uneven under the action of high field intensity, and the field intensity at the defect part is higher, so that the part has the defect of non-penetration, namely partial discharge. The existence of partial discharge can cause insulation degradation of the insulation medium, and if the partial discharge is not processed and controlled, insulation breakdown of electrical equipment can be caused finally.
Because the internal structure of the switch cabinet is compact, the parts are various, and the insulation distance is small, partial discharge is easy to occur. The main factors causing partial discharge defects in switchgear cabinets include: the surface of the insulating part is dirty, damp and condensed; poor contact is formed at the joint of the high-voltage bus bar, the isolation contact and the cable lap joint; the conductor and the inner surface of the cabinet body are provided with metal projections and the like. The data show that insulation degradation failures of the electrical equipment inside the switchgear due to partial discharge account for 66% of the total number of switchgear failures. In order to prevent such faults, the insulation state of the switchgear needs to be monitored.
In the currently common partial discharge monitoring method, the ultrahigh frequency method has high equipment cost; the pulse current method and the transient earth voltage method can be subjected to certain electromagnetic interference; gas chromatography is only applicable to closed environments; the infrared thermal imaging method can only measure partial discharge when the leakage current is large and is easily influenced by the environment; the ultrasonic method has the advantages of no electromagnetic interference, high positioning accuracy and the like, and has good fault initial stage identification capability. However, in the current partial discharge monitoring based on ultrasonic detection, the ultrasonic wave cannot measure the partial discharge strength due to the severe attenuation in the propagation process.
Disclosure of Invention
The invention aims to overcome the technical defects, provides a method and equipment for monitoring the partial discharge intensity of a switch cabinet and a storage medium, and solves the technical problem that the partial discharge intensity of the switch cabinet cannot be effectively measured in the prior art.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a method for monitoring partial discharge intensity of a switch cabinet, including the following steps:
acquiring an ultrasonic signal acquired by an ultrasonic sensor;
performing Fourier transform on the ultrasonic signal to obtain a spectrogram corresponding to the ultrasonic signal;
according to the spectrogram, carrying out frequency band division on the ultrasonic signals;
calculating the energy ratio of the ultrasonic energy corresponding to each frequency band in the whole frequency range of the ultrasonic signal, and taking the energy ratio as a frequency response value;
and calculating the apparent discharge amount corresponding to each frequency band according to the frequency response value of each frequency band, and judging the change trend of the local discharge intensity of the switch cabinet according to each apparent discharge amount.
Preferably, in the method for monitoring partial discharge intensity of a switch cabinet, the frequency division of the ultrasonic signal according to the spectrogram specifically includes:
and dividing the ultrasonic signal into a plurality of frequency bands according to a preset frequency range length by taking the main frequency of the ultrasonic signal as a center.
Preferably, in the method for monitoring the partial discharge intensity of the switch cabinet, the number of the frequency bands is 5, and the preset frequency range is 0.4 KHz.
Preferably, in the method for monitoring partial discharge intensity of a switch cabinet, the calculating an energy ratio of the ultrasonic energy corresponding to each frequency band in the whole frequency range of the ultrasonic signal, and the calculating specifically includes as a frequency response value:
calculating ultrasonic energy corresponding to each frequency band by adopting an ultrasonic energy calculation formula according to the spectrogram;
and calculating the energy ratio of the ultrasonic energy of each frequency band in the whole frequency range of the ultrasonic signal, and taking the energy ratio as a frequency response value.
Preferably, in the method for monitoring partial discharge intensity of a switch cabinet, the ultrasonic energy calculation formula is specifically:
S＝(P*w2*u*n2)/2，
where S denotes ultrasonic energy, P denotes density of the air medium, w denotes average frequency of the frequency band, u denotes wave velocity, and n denotes amplitude of the frequency band.
Preferably, in the method for monitoring the partial discharge intensity of the switch cabinet, the calculating the apparent discharge amount corresponding to each frequency band according to the frequency response value of each frequency band, and the calculating the partial discharge intensity of the switch cabinet according to each apparent discharge amount specifically includes:
acquiring a fitting curve graph of the energy ratio and the apparent discharge amount of each frequency band;
calculating the apparent discharge amount corresponding to each frequency band according to the fitting curve graph and the frequency response value of each frequency band;
and judging the variation trend of the local discharge intensity of the switch cabinet according to the apparent discharge amount.
Preferably, in the method for monitoring the partial discharge intensity of the switch cabinet, the determining the variation trend of the partial discharge intensity of the switch cabinet according to each apparent discharge amount specifically includes;
and when the apparent discharge amount corresponding to the low-frequency band is in a decreasing trend, the apparent discharge amount corresponding to the main-frequency band is in an increasing trend, and the apparent discharge amount corresponding to the high-frequency band is kept unchanged, judging that the partial discharge intensity of the switch cabinet is increased, otherwise, judging that the partial discharge intensity of the switch cabinet is not increased.
Preferably, in the method for monitoring the partial discharge intensity of the switch cabinet, the low frequency range is a frequency range smaller than a frequency range in which a main frequency of the ultrasonic signal is located, the main frequency range is a frequency range in which the main frequency of the ultrasonic signal is located, and the high frequency range is a frequency range larger than the frequency range in which the main frequency of the ultrasonic signal is located.
In a second aspect, the present invention further provides a switch cabinet partial discharge intensity monitoring device, including: a processor and a memory;
the memory has stored thereon a computer readable program executable by the processor;
the processor, when executing the computer readable program, implements the steps in the method for monitoring partial discharge intensity of a switchgear as described above.
In a third aspect, the present invention also provides a computer readable storage medium storing one or more programs, which are executable by one or more processors to implement the steps in the method for monitoring partial discharge intensity of a switchgear as described above.
Compared with the prior art, the method, the equipment and the storage medium for monitoring the local discharge intensity of the switch cabinet provided by the invention have the advantages that firstly, the ultrasonic sensor is used for continuously collecting ultrasonic signals in the switch cabinet, then, a frequency spectrogram is obtained after Fourier transformation is carried out on the ultrasonic signals, the ultrasonic signals are divided into a plurality of frequency bands according to the frequency spectrogram, the apparent discharge amount of each frequency band is analyzed according to the frequency response of each frequency band by calculating the frequency response of each frequency band, then, the change trend of the local discharge intensity of the switch cabinet can be measured in a balanced manner according to the apparent discharge amount, so that the change trend of the local discharge intensity of the switch cabinet can be timely processed before the continuously developed local discharge causes accidents, the ultrasonic method has a wider application range, the local discharge intensity can be judged without being combined with other methods, the method has the effects of effectively preventing power failure accidents, improving the power supply reliability, reducing the overhaul cost, The great significance of ensuring the safe and stable operation of the power distribution network.
Drawings
FIG. 1 is a flow chart of a method for monitoring partial discharge intensity of a switchgear according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of a preferred embodiment of the present invention for collecting ultrasonic signals;
FIG. 3 is a schematic diagram of a preferred embodiment of an amplification circuit in an ultrasonic sensor according to the invention;
FIG. 4 is a schematic diagram of a preferred embodiment of the trend of the energy ratio of each frequency band with increasing apparent discharge;
FIG. 5 is a graph of a fit of a preferred embodiment of the trend of the energy fraction of each frequency band with increasing apparent discharge;
FIG. 6 is a diagram of a preferred embodiment of a mechanical equivalent circuit during partial discharge;
fig. 7 is a schematic operating environment diagram of a partial discharge intensity monitoring program of a switch cabinet according to a preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a method for monitoring partial discharge intensity of a switch cabinet according to an embodiment of the present invention includes the following steps:
s100, acquiring an ultrasonic signal acquired by an ultrasonic sensor;
s200, carrying out Fourier transform on the ultrasonic signal to obtain a spectrogram corresponding to the ultrasonic signal;
s300, dividing the frequency bands of the ultrasonic signals according to the spectrogram;
s400, calculating the energy ratio of the ultrasonic energy corresponding to each frequency band in the whole frequency range of the ultrasonic signal, and taking the energy ratio as a frequency response value;
s500, calculating the apparent discharge amount corresponding to each frequency band according to the frequency response value of each frequency band, and judging the change trend of the local discharge intensity of the switch cabinet according to each apparent discharge amount.
In the embodiment, firstly, the ultrasonic sensor is used for continuously collecting ultrasonic signals in the switch cabinet, then, a spectrogram is obtained after Fourier transformation is carried out on the ultrasonic signals, the ultrasonic signals are divided into a plurality of frequency bands according to the spectrogram, frequency response of each frequency band is calculated, apparent discharge amount of each frequency band is analyzed according to the frequency response, then, the change trend of the local discharge intensity of the switch cabinet can be measured in a balanced manner according to the apparent discharge amount, so that timely treatment can be carried out before accidents are caused by continuously developed local discharge, the ultrasonic method has a wider application range, the local discharge intensity can be judged without being used in combination with other methods, and the method has the important significance of effectively preventing power failure accidents, improving power supply reliability, reducing maintenance cost and guaranteeing safe and stable operation of a power distribution network.
In a preferred embodiment, as shown in fig. 2, in the step S100, since the frequency range of the ultrasonic wave generated by the partial discharge is 20kHz to 200kHz, the embodiment of the present invention preferably collects the ultrasonic wave signal by using a sensor whose bandwidth covers the range, and in addition, in consideration of the effective propagation distance of the ultrasonic wave, the distance between the ultrasonic wave sensor and the switch cabinet is not more than 500mm in order to ensure that the ultrasonic wave sensor has sufficient sensitivity. An amplifying circuit is integrated in the ultrasonic sensor, the ultrasonic signal is received by the ultrasonic sensor and then converted into a voltage signal, the voltage signal is amplified and then output to an oscilloscope for display, and then the switch cabinet local discharge intensity monitoring equipment in the embodiment of the invention collects the ultrasonic signal received by the oscilloscope.
Preferably, referring to fig. 3, the amplifying circuit is configured to amplify the voltage signal, and the amplifying circuit adopts two-stage amplification, where the amplification factor is 1694.21 times. The oscilloscope is preferably an oscilloscope with the model number of TDS2024C, and has four channels, the sampling rate of each channel can reach 2GS/s at most, and the requirement of ultrasonic measurement is met.
In a preferred embodiment, in the step S200, the ultrasonic signal is analyzed by Fast Fourier Transform (FFT) to obtain a corresponding spectrogram. The fast Fourier transform energy conversion greatly reduces the multiplication times required by a computer for calculating discrete Fourier transform, particularly, the more the number N of transformed sampling points is, the more remarkable the calculation amount of the FFT algorithm is saved, the specific transformation process is the prior art, and the details are not repeated.
In a preferred embodiment, the step S300 specifically includes:
and dividing the ultrasonic signal into a plurality of frequency bands according to a preset frequency range length by taking the main frequency of the ultrasonic signal as a center.
Preferably, the number of the frequency bands is 5, and the preset frequency range is 0.4 KHz. The frequency ranges of the frequency bands are respectively 32.8 kHz-33.2 kHz, 33.2 kHz-33.6 kHz, 33.6 kHz-34 kHz, 34 kHz-34.4 kHz and 34.4 kHz-34.8 kHz. Wherein the main frequency is 33.8 kHz.
In a preferred embodiment, the step S400 specifically includes:
calculating ultrasonic energy corresponding to each frequency band by adopting an ultrasonic energy calculation formula according to the spectrogram;
and calculating the energy ratio of the ultrasonic energy of each frequency band in the whole frequency range of the ultrasonic signal, and taking the energy ratio as a frequency response value.
Preferably, the ultrasonic energy calculation formula is specifically:
S＝(P*w2*u*n2)/2，
where S denotes ultrasonic energy, P denotes density of the air medium, w denotes average frequency of the frequency band, u denotes wave velocity, and n denotes amplitude of the frequency band.
In a preferred embodiment, the step S500 specifically includes:
acquiring a fitting curve graph of the energy ratio and the apparent discharge amount of each frequency band;
calculating the apparent discharge amount corresponding to each frequency band according to the fitting curve graph and the frequency response value of each frequency band;
and judging the variation trend of the local discharge intensity of the switch cabinet according to the apparent discharge amount.
Preferably, the judging of the variation trend of the partial discharge intensity of the switch cabinet according to each apparent discharge amount specifically includes;
and when the apparent discharge amount corresponding to the low-frequency band is in a decreasing trend, the apparent discharge amount corresponding to the main-frequency band is in an increasing trend, and the apparent discharge amount corresponding to the high-frequency band is kept unchanged, judging that the partial discharge intensity of the switch cabinet is increased, otherwise, judging that the partial discharge intensity of the switch cabinet is not increased.
Preferably, the low frequency band is a frequency range smaller than a frequency band in which the main frequency of the ultrasonic signal is located, the main frequency band is a frequency band in which the main frequency of the ultrasonic signal is located, and the high frequency band is a frequency range larger than the frequency band in which the main frequency of the ultrasonic signal is located.
Referring to fig. 4 and 5, specifically, the energy ratio in the frequency range of 33.6kHz to 34kHz increases with the apparent discharge amount, and the overall trend increases; the energy ratio of the frequency range of 34 kHz-34.4 kHz and 34.4 kHz-34.8 kHz increases along with the apparent discharge amount and basically keeps unchanged; the energy ratio in the frequency ranges of 32.8 kHz-33.2 kHz and 33.2 kHz-33.6 kHz increases with the apparent discharge amount, and the whole energy ratio decreases. The reason for this phenomenon is two-fold: firstly, the main frequency of the ultrasonic wave is in the range of 33.6kHz to 34kHz, the amplitude of the ultrasonic wave of the frequency is maximally increased along with the increase of the apparent discharge amount, the energy ratio of the frequency range is maximally increased, and the energy ratios of other frequency ranges are reduced. Secondly, as the apparent discharge amount increases, the local discharge heat generation amount increases, the discharge channel expands due to the influence of heat radiation, the oscillation frequency of the acting force on the external air at the boundary of the discharge channel increases, namely the frequency of the emitted ultrasonic wave increases, and the distribution of the average energy flow density is entirely shifted to high frequency.
For convenience of explanation, the latter can be more accurately described below using electrical, mechanical, and acoustic analogy methods, with the corresponding concepts in the three disciplines shown in the following table.
In partial discharge, the mechanical process can be analogized to the zero input response of the second-order circuit in the circuit, as shown in FIG. 6. Therefore, the stress on the boundary of the discharge channel satisfies the following conditions:
for air media, its mechanical resistance RmVery small, then have
The mechanical process illustrating partial discharge is an oscillating process. (1) Middle ucThe value of the acting force applied to the boundary of the discharge channel is multiplied by the surface area of the discharge channel, and the product is the sound pressure of the ultrasonic wave. Then there are:
wherein
For air media, at one atmosphere pressure and at a low speed of motion:
where ρ represents the density of the material in the discharge channel, V represents the volume of the discharge channel, and p0The standard atmospheric pressure is shown, A represents the effective contact area of the discharge channel and the air, and k represents the resistance coefficient. The discharge channel is approximately a cylinder, and its bottom surface radius is r, and the height is discharge gap bipolar plate distance d, then has:
substituting (5) and (6) into (4) can obtain:
wherein, as the apparent discharge amount increases,standard atmospheric pressure p0The resistance coefficient k, the mass m of the discharge channel material and the distance d between two polar plates of the discharge gap are all constants; since the discharge channel expands due to heat, r increases
Decreasing, the vibration angular frequency ω increases. From the above analysis, it can be seen that the ultrasonic frequency increases as the apparent discharge amount increases. The increase in the energy fraction in the high frequency range caused by this effect is counterbalanced by the decrease in the energy fraction caused by the first cause, resulting in a substantially constant energy fraction in the high frequency range.
Therefore, when the partial discharge intensity of the switch cabinet is measured, when the apparent discharge amount corresponding to the low-frequency band is in a decreasing trend, the apparent discharge amount corresponding to the main-frequency band is in an increasing trend, and the apparent discharge amount corresponding to the high-frequency band is kept unchanged, the partial discharge intensity of the switch cabinet is judged to be increased, otherwise, the partial discharge intensity of the switch cabinet is judged not to be increased. Therefore, the change trend of the partial discharge intensity of the switch cabinet can be correspondingly measured according to the frequency response value of each frequency band, and the change trend can be timely processed before an accident caused by continuously developed partial discharge, so that the ultrasonic wave method has a wider application range, the partial discharge intensity can be judged without being used in combination with other methods, and the method has the great significance of effectively preventing power failure accidents, improving power supply reliability, reducing maintenance cost and guaranteeing safe and stable operation of a power distribution network.
As shown in fig. 7, based on the method for monitoring the partial discharge intensity of the switch cabinet, the invention further provides a device for monitoring the partial discharge intensity of the switch cabinet, and the device for monitoring the partial discharge intensity of the switch cabinet can be a mobile terminal, a desktop computer, a notebook computer, a palm computer, a server and other computing devices. The switch cabinet partial discharge intensity monitoring device comprises a processor 10, a memory 20 and a display 30. Fig. 7 shows only some of the components of the switchgear partial discharge intensity monitoring apparatus, but it should be understood that not all of the shown components are required and that more or fewer components may be implemented instead.
The memory 20 may in some embodiments be an internal storage unit of the switchgear partial discharge intensity monitoring device, such as a hard disk or a memory of the switchgear partial discharge intensity monitoring device. In other embodiments, the memory 20 may also be an external storage device of the switch cabinet partial discharge intensity monitoring device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are equipped on the switch cabinet partial discharge intensity monitoring device. Further, the memory 20 may also include both an internal storage unit of the switch cabinet partial discharge intensity monitoring device and an external storage device. The memory 20 is used for storing application software installed on the switch cabinet partial discharge intensity monitoring device and various types of data, such as program codes of the installed switch cabinet partial discharge intensity monitoring device. The memory 20 may also be used to temporarily store data that has been output or is to be output. In an embodiment, the memory 20 stores a switch cabinet partial discharge intensity monitoring program 40, and the switch cabinet partial discharge intensity monitoring program 40 can be executed by the processor 10, so as to implement the switch cabinet partial discharge intensity monitoring method according to the embodiments of the present application.
The processor 10 may be a Central Processing Unit (CPU), a microprocessor or other data Processing chip in some embodiments, and is used for running program codes stored in the memory 20 or Processing data, such as executing the switch cabinet partial discharge intensity monitoring method.
The display 30 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch panel, or the like in some embodiments. The display 30 is used for displaying information of the partial discharge intensity monitoring equipment of the switch cabinet and displaying a visual user interface. The components 10 to 30 of the partial discharge intensity monitoring device of the switchgear cabinet communicate with one another via a system bus.
In an embodiment, the steps in the monitoring method of the partial discharge intensity of the switchgear as described above are implemented when the processor 10 executes the monitoring program 40 of the partial discharge intensity of the switchgear in the memory 20.
In summary, according to the method, the device and the storage medium for monitoring the local discharge intensity of the switch cabinet provided by the invention, the ultrasonic signal in the switch cabinet is continuously collected by the ultrasonic sensor, the spectrogram is obtained by performing fourier transform on the ultrasonic signal, the ultrasonic signal is divided into a plurality of frequency bands according to the spectrogram, the apparent discharge amount of each frequency band is analyzed according to the frequency response of each frequency band by calculating the frequency response of each frequency band, and the variation trend of the local discharge intensity of the switch cabinet can be measured in a balanced manner according to the apparent discharge amount, so that the local discharge intensity can be timely processed before an accident caused by continuously-developed local discharge, the ultrasonic method has a wider application range, the local discharge intensity can be judged without being combined with other methods, and the method, the device and the storage medium have the advantages of effectively preventing power failure accidents, improving power supply reliability, reducing maintenance cost and the like, The great significance of ensuring the safe and stable operation of the power distribution network.
Of course, it will be understood by those skilled in the art that all or part of the processes of the methods of the above embodiments may be implemented by a computer program instructing relevant hardware (such as a processor, a controller, etc.), and the program may be stored in a computer readable storage medium, and when executed, the program may include the processes of the above method embodiments. The storage medium may be a memory, a magnetic disk, an optical disk, etc.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A method for monitoring partial discharge intensity of a switch cabinet is characterized by comprising the following steps:
acquiring an ultrasonic signal acquired by an ultrasonic sensor;
performing Fourier transform on the ultrasonic signal to obtain a spectrogram corresponding to the ultrasonic signal;
according to the spectrogram, carrying out frequency band division on the ultrasonic signals;
calculating the energy ratio of the ultrasonic energy corresponding to each frequency band in the whole frequency range of the ultrasonic signal, and taking the energy ratio as a frequency response value;
and calculating the apparent discharge amount corresponding to each frequency band according to the frequency response value of each frequency band, and judging the change trend of the local discharge intensity of the switch cabinet according to each apparent discharge amount.
2. The method for monitoring the partial discharge intensity of the switch cabinet according to claim 1, wherein the frequency division of the ultrasonic signal according to the spectrogram specifically comprises:
and dividing the ultrasonic signal into a plurality of frequency bands according to a preset frequency range length by taking the main frequency of the ultrasonic signal as a center.
3. The method for monitoring the partial discharge intensity of the switch cabinet according to claim 2, wherein the number of the frequency bands is 5, and the preset frequency range is 0.4 KHz.
4. The method for monitoring the partial discharge intensity of the switch cabinet according to claim 1, wherein the calculating the energy ratio of the ultrasonic energy corresponding to each frequency band in the whole frequency range of the ultrasonic signal specifically includes:
calculating ultrasonic energy corresponding to each frequency band by adopting an ultrasonic energy calculation formula according to the spectrogram;
and calculating the energy ratio of the ultrasonic energy of each frequency band in the whole frequency range of the ultrasonic signal, and taking the energy ratio as a frequency response value.
5. The method for monitoring the partial discharge intensity of the switch cabinet according to claim 4, wherein the ultrasonic energy calculation formula is specifically as follows:
S＝(P*w2*u*n2)/2，
where S denotes ultrasonic energy, P denotes density of the air medium, w denotes average frequency of the frequency band, u denotes wave velocity, and n denotes amplitude of the frequency band.
6. The method for monitoring the partial discharge intensity of the switch cabinet according to claim 1, wherein the calculating the apparent discharge amount corresponding to each frequency band according to the frequency response value of each frequency band, and the calculating the partial discharge intensity of the switch cabinet according to each apparent discharge amount specifically comprises:
acquiring a fitting curve graph of the energy ratio and the apparent discharge amount of each frequency band;
calculating the apparent discharge amount corresponding to each frequency band according to the fitting curve graph and the frequency response value of each frequency band;
and judging the variation trend of the local discharge intensity of the switch cabinet according to the apparent discharge amount.
7. The method for monitoring the partial discharge intensity of the switch cabinet according to claim 6, wherein the step of judging the variation trend of the partial discharge intensity of the switch cabinet according to the apparent discharge amount specifically comprises the steps of;
and when the apparent discharge amount corresponding to the low-frequency band is in a decreasing trend, the apparent discharge amount corresponding to the main-frequency band is in an increasing trend, and the apparent discharge amount corresponding to the high-frequency band is kept unchanged, judging that the partial discharge intensity of the switch cabinet is increased, otherwise, judging that the partial discharge intensity of the switch cabinet is not increased.
8. The method for monitoring the partial discharge intensity of the switch cabinet according to claim 7, wherein the low frequency band is a frequency range smaller than a frequency band in which a main frequency of the ultrasonic signal is located, the main frequency band is a frequency band in which the main frequency of the ultrasonic signal is located, and the high frequency band is a frequency range larger than the frequency band in which the main frequency of the ultrasonic signal is located.
9. A switchgear partial discharge intensity monitoring device, characterized by comprising: a processor and a memory;
the memory has stored thereon a computer readable program executable by the processor;
the processor, when executing the computer readable program, implements the steps in the method for monitoring partial discharge intensity of a switchgear according to any of claims 1-8.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores one or more programs which are executable by one or more processors to implement the steps in the method for monitoring partial discharge intensity of a switchgear according to any one of claims 1 to 8.
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| CN117723917A (en) * | 2024-02-07 | 2024-03-19 | 国网山西省电力公司太原供电公司 | Monitoring application method based on optical fiber extrinsic Fabry-Perot type ultrasonic sensor |
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