Device for monitoring partial discharge, monitoring terminal and monitoring system

Abstract

The utility model provides a device for monitoring partial discharge, a monitoring end and a monitoring system, and the device obtains an ultrasonic signal through a sensor module, converts the ultrasonic signal into a tiny electric signal, and transmits the tiny electric signal to a signal processing module. The signal processing module receives the micro electric signal, converts the micro electric signal into a recognizable signal, and sends the recognizable signal to the data acquisition module; the ultrasonic signal comprises an internal ultrasonic signal and an external ultrasonic signal; the data acquisition module acquires first map data of partial discharge based on the recognizable signal, and sends the first map data to the data transmission module; the data transmission module sends the first atlas data to a monitoring end; the battery management module supplies power to the sensor module, the signal processing module, the data acquisition module and the data transmission module. The influence of external ultrasonic signals on partial discharge monitoring is eliminated, the accuracy of partial discharge monitoring is improved, the workload of partial discharge identification is reduced, and a large number of false alarms are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of partial discharge monitoring, in particular to a device, a monitoring terminal and a monitoring system for monitoring partial discharge. Background Art

[0002] The distribution system switch cabinet in the power distribution room is affected by environmental humidity, temperature, etc. during long-term operation, and the insulation material gradually ages, resulting in partial discharge. If not discovered and handled in time, it may cause serious insulation accidents. The partial discharge of the distribution system switch cabinet in the smart grid is generally accompanied by sound, light, electricity and other signals. Ultrasonic detection technology, as one of the detection methods for partial discharge of the distribution system switch cabinet in the intelligent distribution system, is widely used in partial discharge online monitoring equipment.

[0003] The existing technical solution is to deploy ordinary ultrasonic partial discharge online monitoring equipment, periodically collect ultrasonic partial discharge signals, form a partial discharge spectrum data reporting platform, and generate an alarm if there is any data abnormality. Then professionals will identify the type of partial discharge and take countermeasures. This solution can continuously monitor the changes in partial discharge of the switch cabinet and help professionals better analyze the degradation of the switch cabinet equipment, but it is easily interfered by other ultrasonic signals outside the switch cabinet (such as indoor fan vibration, lighting, transformer operation, cars outside the station, etc.), resulting in a large number of false alarms and increasing the workload of partial discharge identification. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a device, a monitoring terminal and a monitoring system for monitoring partial discharge, so as to eliminate the influence of external ultrasonic signals on partial discharge monitoring, improve the accuracy of partial discharge monitoring, reduce the workload of partial discharge identification, avoid a large number of false alarms, and achieve energy saving and efficiency improvement.

[0005] In the first aspect, an embodiment of the utility model provides a device for monitoring partial discharge, which is used to monitor partial discharge in a switch cabinet of a power distribution system, and the device includes a sensor module, a signal processing module, a data acquisition module, a data transmission module and a battery management module; the device is communicatively connected to a monitoring end for monitoring partial discharge; the sensor module is used to acquire an ultrasonic signal and convert the ultrasonic signal into a tiny electrical signal, and send the tiny electrical signal to the signal processing module; the ultrasonic signal includes an internal ultrasonic signal and an external ultrasonic signal; the signal processing module is used to receive the tiny electrical signal and convert the tiny electrical signal into a recognizable signal, and send the recognizable signal to the data acquisition module; the data acquisition module is used to receive the recognizable signal and acquire first spectrum data of partial discharge based on the recognizable signal, and send the first spectrum data to the data transmission module; the data transmission module is used to receive the first spectrum data, and send the first spectrum data to the monitoring end; the battery management module is used to power the sensor module, the signal processing module, the data acquisition module and the data transmission module.

[0006] In a preferred embodiment of the utility model, the sensor module includes an internal sensing unit and an external sensing unit; the internal sensing unit is used to obtain internal ultrasonic signals inside the distribution system switch cabinet; the external sensing unit is used to obtain external ultrasonic signals outside the distribution system switch cabinet.

[0007] In a preferred embodiment of the utility model, the signal processing module is also used to: amplify and filter the tiny electrical signal to obtain a recognizable signal; wherein the recognizable signal includes an externally recognizable signal and an internally recognizable signal.

[0008] In a preferred embodiment of the utility model, the data acquisition module is also used to: determine the identifiable features of the partial discharge based on the identifiable signal; wherein the identifiable features include external identifiable features and internal identifiable features; generate the first atlas data of the partial discharge based on the identifiable features and the pre-set first atlas data rules; the first atlas data includes first external atlas data and first internal atlas data.

[0009] In a preferred embodiment of the utility model, the data acquisition module is also used to: determine a first characteristic parameter based on the identifiable feature; the first characteristic parameter includes a first external characteristic parameter and a first internal characteristic parameter; generate first atlas data based on the first characteristic parameter and the first atlas data rule.

[0010] In a preferred embodiment of the utility model, the data acquisition module is also used to: extract multiple first parameters from the first characteristic parameter according to the first atlas data rule; wherein the first parameter includes a first external parameter and a first internal parameter; and use the multiple first parameters as the first atlas data.

[0011] In a preferred embodiment of the utility model, the data transmission module is also used to: convert the format of the first spectrum data and the first characteristic parameter to obtain the second spectrum data and the second characteristic parameter; and send the second spectrum data and the second characteristic parameter to the monitoring end according to a preset transmission protocol.

[0012] In the second aspect, an embodiment of the utility model provides a monitoring terminal for monitoring local discharge, which is used to monitor local discharge in a switch cabinet of a power distribution system. The monitoring terminal is communicatively connected to the device for monitoring local discharge of the first aspect; the monitoring terminal is used to receive third spectrum data and third characteristic parameters sent by the device, and monitor local discharge based on the third spectrum data; wherein the third spectrum data includes third external spectrum data and third internal spectrum data, and the third characteristic parameters include third external characteristic parameters and third internal characteristic parameters.

[0013] In a preferred embodiment of the utility model, the monitoring end for monitoring local discharge is also used to: determine the phase difference between the third external spectrum data and the third internal spectrum data; eliminate the interference signal in the internal ultrasonic signal corresponding to the local discharge based on the phase difference to obtain the local discharge signal; and monitor the local discharge based on the local discharge signal.

[0014] In a third aspect, an embodiment of the utility model provides a monitoring system for monitoring partial discharge, which is applied to monitoring partial discharge in a switch cabinet of a power distribution system, and comprises a device for monitoring partial discharge of a first aspect and a monitoring terminal for monitoring partial discharge of a second aspect, and the device and the monitoring terminal are communicatively connected.

[0015] The embodiments of the present invention bring the following beneficial effects:

[0016] The embodiment of the utility model provides a device, a monitoring terminal and a monitoring system for monitoring partial discharge, wherein the ultrasonic signal is obtained through the sensor module and converted into a tiny electrical signal, and the tiny electrical signal is sent to the signal processing module; the signal processing module receives the tiny electrical signal and converts the tiny electrical signal into a recognizable signal, and sends the recognizable signal to the data acquisition module; the ultrasonic signal includes an internal ultrasonic signal and an external ultrasonic signal; the data acquisition module receives the recognizable signal and collects the first spectrum data of the partial discharge based on the recognizable signal, and sends the first spectrum data to the data transmission module; the data transmission module receives the first spectrum data and sends the first spectrum data to the monitoring terminal; the battery management module supplies power to the sensor module, the signal processing module, the data acquisition module and the data transmission module. In this method, the influence of the external ultrasonic signal on the partial discharge monitoring is eliminated, the accuracy of the partial discharge monitoring is improved, the workload of the partial discharge identification is reduced, a large number of false alarms are avoided, and energy saving and efficiency improvement are achieved.

[0017] Other features and advantages of the present disclosure will be set forth in the following description, or some features and advantages may be inferred or unambiguously determined from the description, or may be learned by implementing the above-mentioned technology of the present disclosure.

[0018] In order to make the above-mentioned objectives, features and advantages of the present disclosure more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A structural diagram of a device for monitoring partial discharge provided in an embodiment of the utility model;

[0021] Figure 2a A structural diagram of a sensor module provided by an embodiment of the utility model;

[0022] Figure 2b A schematic diagram of the deployment of sensor modules provided in an embodiment of the utility model;

[0023] Figure 3 A working flow chart of a monitoring terminal for monitoring partial discharge provided by an embodiment of the utility model;

[0024] Figure 4 A structural diagram of a monitoring system for monitoring partial discharge provided in an embodiment of the utility model.

[0025] Diagram:

[0026] 01-equipment for monitoring partial discharge; 02-monitoring terminal for monitoring partial discharge; 10-sensor module; 101-internal sensor unit; 102-external sensor unit; 103-distribution system switch cabinet; 104-partial discharge; 105-ultrasonic interference source; 20-signal processing module; 30-data acquisition module; 40-data transmission module; 50-battery management module; 00-monitoring system for monitoring partial discharge. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the intelligent power distribution system, the switch cabinet of the power distribution system is affected by the environmental humidity, temperature and other factors during long-term operation, and the insulation material gradually ages, resulting in partial discharge. If not discovered and handled in time, it may cause serious insulation accidents. The partial discharge of the switch cabinet of the power distribution system in the smart grid is generally accompanied by sound, light, electricity and other signals. Ultrasonic detection technology, as one of the detection methods for partial discharge of the switch cabinet of the power distribution system in the intelligent power distribution system, is widely used in online partial discharge monitoring equipment.

[0029] The existing technical solution is to deploy ordinary ultrasonic partial discharge online monitoring equipment, periodically collect ultrasonic partial discharge signals, form a partial discharge spectrum data reporting platform, and generate an alarm if there is any data abnormality. Then professionals will identify the type of partial discharge and take countermeasures. This solution can continuously monitor the changes in partial discharge of the switch cabinet and help professionals better analyze the degradation of the switch cabinet equipment, but it is easily interfered by other ultrasonic signals outside the switch cabinet (such as indoor fan vibration, lighting, transformer operation, cars outside the station, etc.), resulting in a large number of false alarms and increasing the workload of partial discharge identification.

[0030] Based on this, the embodiment of the utility model provides a device, a monitoring terminal and a monitoring system for monitoring partial discharge, which can obtain ultrasonic signals through the sensor module and convert the ultrasonic signals into tiny electrical signals, and send the tiny electrical signals to the signal processing module; the signal processing module will receive the tiny electrical signals and convert the tiny electrical signals into recognizable signals, and send the recognizable signals to the data acquisition module; the ultrasonic signals include internal ultrasonic signals and external ultrasonic signals; the data acquisition module receives the recognizable signals and collects the first spectrum data of partial discharge based on the recognizable signals, and sends the first spectrum data to the data transmission module; the data transmission module receives the first spectrum data and sends the first spectrum data to the monitoring terminal; wherein the monitoring terminal is used to monitor partial discharge based on the first spectrum data; the battery management module supplies power to the sensor module, the signal processing module, the data acquisition module and the data transmission module. In this way, the influence of external ultrasonic signals on partial discharge monitoring is eliminated, the accuracy of partial discharge monitoring is improved, the workload of partial discharge identification is reduced, a large number of false alarms are avoided, and energy saving and efficiency improvement are achieved.

[0031] To facilitate understanding of this embodiment, a device for monitoring partial discharge disclosed in an embodiment of the utility model is first introduced in detail.

[0032] Example 1

[0033] The embodiment of the utility model provides a device for monitoring partial discharge, which is applied to monitor partial discharge in a switch cabinet of a power distribution system. Figure 1 A structural diagram of a device for monitoring partial discharge provided in an embodiment of the utility model.

[0034] like Figure 1 As shown, the device 01 for monitoring partial discharge may include the following structures: a sensor module 10, a signal processing module 20, a data acquisition module 30, a data transmission module 40 and a battery management module 50. The device is communicatively connected to a monitoring terminal 02 for monitoring partial discharge.

[0035] The sensor module 10 is used to acquire ultrasonic signals and convert the ultrasonic signals into tiny electrical signals, and send the tiny electrical signals to the signal processing module 20 .

[0036] The ultrasonic signal includes an internal ultrasonic signal and an external ultrasonic signal. The internal ultrasonic signal is an ultrasonic signal inside the switch cabinet of the power distribution system, and the external ultrasonic signal is an ultrasonic signal outside the switch cabinet of the power distribution system.

[0037] The sensor module 10 may include an ultrasonic sensor. There may be two ultrasonic sensors, and the two ultrasonic sensors monitor external ultrasonic signals and internal ultrasonic signals respectively.

[0038] The internal ultrasonic signal is specifically used to determine whether partial discharge occurs, and the external ultrasonic signal is used to eliminate external interference signals to improve the accuracy of partial discharge monitoring and reduce the workload of partial discharge identification.

[0039] In the process of partial discharge, ultrasonic waves, namely ultrasonic signals, are generated due to the rapid movement of electric charges and changes in the electric field. These ultrasonic signals can be captured by the sensor module 10 and converted into tiny electrical signals.

[0040] The signal processing module 20 is used to receive tiny electrical signals and convert the tiny electrical signals into recognizable signals, and send the recognizable signals to the data acquisition module 30 .

[0041] The identifiable signal may include an externally identifiable signal and an internally identifiable signal.

[0042] Among them, the external identifiable features correspond to the identifiable features outside the distribution system switch cabinet, and the internal identifiable features correspond to the identifiable features inside the high-voltage switch door. The identifiable features may include the amplitude, frequency, duration, etc. of the discharge, which can reflect information such as the type, intensity and location of the partial discharge.

[0043] The recognizable signal is a signal that can be recognized and collected by an analog-to-digital converter (ADC).

[0044] The data acquisition module 30 is used to receive the identifiable signal and acquire first spectrum data of partial discharge based on the identifiable signal, and send the first spectrum data to the data transmission module 40 .

[0045] The first atlas data may include first external atlas data and first internal atlas data, wherein the first external atlas data corresponds to an externally identifiable signal and the first internal atlas data corresponds to an internally identifiable signal.

[0046] Among them, the first spectrum data represents the amplitude of the corresponding time within a preset power frequency cycle, for example, it can represent the amplitude of the corresponding time within 50 power frequency cycles. By combining the first external spectrum data and the first internal spectrum data, the interference signal outside the distribution system switch cabinet can be eliminated to improve the accuracy of partial discharge monitoring and reduce the workload of partial discharge identification. For example, when the amplitude of the first internal spectrum data is larger than the amplitude of the first external spectrum data, it can be considered that there is partial discharge in the distribution system switch cabinet.

[0047] The first spectrum data is included in the spectrum, and the spectrum may be a PRPD spectrum and a PRPS spectrum. The two spectra may show a larger peak value of each cycle at a certain phase, that is, the spectrum data.

[0048] The data transmission module 40 is used to receive the first spectrum data, and send the first spectrum data to the monitoring terminal 02 used for monitoring partial discharge.

[0049] The monitoring terminal 02 for monitoring partial discharge is used to monitor partial discharge based on the first spectrum data.

[0050] The first spectrum data may be sent to the user end in accordance with a specified data specification format according to a specified data transmission protocol, so that the monitoring end 02 for monitoring partial discharge can monitor partial discharge.

[0051] Among them, the data transmission protocol can be the LoRa transmission protocol.

[0052] The battery management module 50 is used to supply power to the sensor module 10 , the signal processing module 20 , the data acquisition module 30 and the data transmission module 40 .

[0053] The device 01 for monitoring partial discharge provided by the embodiment of the utility model can obtain ultrasonic signals through the sensor module 10 and convert the ultrasonic signals into tiny electrical signals, and send the tiny electrical signals to the signal processing module 20; the signal processing module 20 will receive the tiny electrical signals and convert the tiny electrical signals into identifiable signals, and send the identifiable signals to the data acquisition module 30; the ultrasonic signals include internal ultrasonic signals and external ultrasonic signals; the data acquisition module 30 receives the identifiable signals and collects the first spectrum data of partial discharge based on the identifiable signals, and sends the first spectrum data to the data transmission module 40; the data transmission module 40 receives the first spectrum data and sends the first spectrum data to the monitoring terminal 02 for monitoring partial discharge; wherein the monitoring terminal 02 for monitoring partial discharge is used to monitor partial discharge based on the first spectrum data; the battery management module 50 supplies power to the sensor module 10, the signal processing module 20, the data acquisition module 30 and the data transmission module 40. In this way, the influence of external ultrasonic signals on partial discharge monitoring is eliminated, the accuracy of partial discharge monitoring is improved, the workload of partial discharge identification is reduced, a large number of false alarms are avoided, and energy saving and efficiency improvement are achieved.

[0054] Example 2

[0055] The embodiment of the utility model also provides a sensor module 10; Figure 2a This is a structural diagram of a sensor module provided in an embodiment of the present utility model.

[0056] like Figure 2a As shown, the sensor module 10 includes the following structures: an internal sensing unit 101 and an external sensing unit 102 .

[0057] The internal sensor unit 101 is used to obtain the internal ultrasonic signal inside the switch cabinet of the power distribution system; the external sensor unit 102 is used to obtain the external ultrasonic signal outside the switch cabinet of the power distribution system.

[0058] The internal sensing unit 101 and the external sensing unit 102 may be ultrasonic sensors, and the monitoring directions of the internal sensing unit 101 and the external sensing unit 102 are completely opposite.

[0059] In practical applications, the sensor module 10 can be installed on the outer side wall of the high voltage switch cabinet door. For ease of understanding, Figure 2b A schematic diagram of the deployment of the sensor module 10 provided in an embodiment of the present utility model.

[0060] like Figure 2bAs shown, in actual application, the internal ultrasonic signal in the distribution system switch cabinet 103 can be obtained through the internal sensor unit 101 to monitor the local discharge 104 in the distribution system switch cabinet 103, and the external ultrasonic signal outside the distribution system switch cabinet 103 can be obtained through the external sensor unit 102 to eliminate the interference of the external ultrasonic signal generated by the ultrasonic interference source 105 outside the distribution system switch cabinet 103 on the monitoring of the local discharge 104 in the distribution system switch cabinet 103.

[0061] In the embodiment of the present application, the signal processing module 20 is also used to: amplify and filter the tiny electrical signal to obtain a recognizable signal; wherein the recognizable signal includes an externally recognizable signal and an internally recognizable signal.

[0062] Among them, in order to increase the amplitude of the tiny electrical signal and make it easier to be detected and processed by subsequent circuits or equipment, the tiny electrical signal will be amplified. At the same time, in order to remove the noise and interference components in the tiny electrical signal and improve the signal quality, the tiny electrical signal will be filtered.

[0063] In the embodiment of the present application, the data acquisition module 30 is also used to: determine the identifiable features of the local discharge based on the identifiable signal; wherein the identifiable features include external identifiable features and internal identifiable features; generate the first spectrum data of the local discharge based on the identifiable features and the pre-set first spectrum data rules; the first spectrum data includes first external spectrum data and first internal spectrum data.

[0064] The data acquisition module 30 may include an ADC, and the identifiable signal may be acquired by the ADC to determine the identifiable features of the partial discharge.

[0065] Among them, the first spectrum data rule can be set according to the required parameters of the first spectrum data, and the parameters such as the number of pulses, pulse amplitude, pulse mean, etc. can be obtained through identifiable features to generate corresponding spectrum data according to the pre-set first spectrum data.

[0066] In an embodiment of the present application, the data acquisition module 30 is also used to: determine a first characteristic parameter based on the identifiable feature; the first characteristic parameter includes a first external characteristic parameter and a first internal characteristic parameter; and generate first atlas data based on the first characteristic parameter and the first atlas data rule.

[0067] Among them, the identifiable features may include the amplitude, frequency, duration, etc. of the discharge, which can reflect the type, intensity, location, etc. of the partial discharge. The characteristic parameters may be the number of pulses, pulse amplitude, pulse mean, etc.

[0068] In an embodiment of the present application, the data acquisition module 30 is also used to: extract multiple first parameters from the first characteristic parameter according to the first atlas data rule; wherein the first parameter includes a first external parameter and a first internal parameter; and use the multiple first parameters as the first atlas data.

[0069] For example, 50 power frequency cycles may be taken, and one power frequency cycle may be, for example, 20 ms. The amplitude of the corresponding time within the power frequency cycle is extracted, and the amplitude may be used as the first spectrum data.

[0070] In the embodiment of the present application, the data transmission module 40 is also used to: convert the format of the first spectrum data and the first characteristic parameter to obtain the second spectrum data and the second characteristic parameter; and send the second spectrum data and the second characteristic parameter to the monitoring terminal 02 for monitoring partial discharge according to a preset transmission protocol.

[0071] The device 01 for monitoring partial discharge provided by the embodiment of the utility model can obtain internal ultrasonic signals and external ultrasonic signals respectively by monitoring the internal sensor unit 101 and the external sensor unit 102 in completely opposite directions to determine whether partial discharge occurs and eliminate external interference signals, thereby improving the accuracy of partial discharge monitoring and reducing the workload of partial discharge identification.

[0072] Example 3

[0073] The embodiment of the utility model also provides a monitoring terminal for monitoring partial discharge; it is used to monitor partial discharge in a switch cabinet of a power distribution system, and the monitoring terminal 02 for monitoring partial discharge is communicatively connected with the device for monitoring partial discharge in the above embodiment.

[0074] Figure 3 The following is a flowchart of a monitoring terminal for monitoring partial discharge provided by the embodiment of the utility model. Figure 3 As shown, the workflow may include the following steps:

[0075] Step S301, receiving the third atlas data and the third characteristic parameter sent by the device.

[0076] Step S302: monitor partial discharge based on the third spectrum data.

[0077] The third atlas data includes third external atlas data and third internal atlas data, and the third characteristic parameter includes third external characteristic parameter and third internal characteristic parameter.

[0078] Specifically, monitoring partial discharge based on the third spectrum data may include the following steps:

[0079] Step S3021, determining the phase difference between the third external atlas data and the third internal atlas data.

[0080] Step S3022: Eliminate interference signals in the internal ultrasonic signal corresponding to the partial discharge based on the phase difference to obtain a partial discharge signal.

[0081] Step S3023: monitor the partial discharge based on the partial discharge signal.

[0082] Among them, the distance between the external ultrasonic signal outside the distribution system switch cabinet and the ultrasonic sensor monitoring the external ultrasonic signal and the ultrasonic sensor monitoring the internal ultrasonic signal is basically the same, and the phase difference of the ultrasonic signal is extremely small. For example, within the range of 5 degrees of the phase difference, both the inside and the outside receive ultrasonic signals with amplitudes close to or the external amplitude is greater than the internal amplitude. In this case, it can be considered that the signal received internally is generated by the external interference signal.

[0083] The device for monitoring partial discharge provided by the embodiment of the utility model can eliminate the interference signal in the internal ultrasonic signal corresponding to the partial discharge based on the phase difference, obtain the partial discharge signal, and then monitor the partial discharge based on the partial discharge signal. The influence of the external ultrasonic signal outside the switch cabinet of the power distribution system on the partial discharge monitoring is eliminated, the accuracy of partial discharge monitoring is improved, the workload of partial discharge identification is reduced, a large number of false alarms are avoided, and energy saving and efficiency improvement are achieved.

[0084] Example 4

[0085] The embodiment of the utility model further provides a monitoring system for monitoring partial discharge, which is applied to monitor partial discharge in a switch cabinet of a power distribution system; the monitoring system for monitoring partial discharge is implemented on the basis of the above embodiment.

[0086] Figure 4 The structure diagram of a monitoring system for monitoring partial discharge provided by the embodiment of the utility model. Figure 4 As shown, the monitoring system 00 for monitoring partial discharge includes: the device 01 for monitoring partial discharge of the above embodiment and the monitoring terminal 02 for monitoring partial discharge of the above embodiment, and the device 01 for monitoring partial discharge and the monitoring terminal 02 for monitoring partial discharge are communicatively connected.

[0087] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0088] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above-mentioned embodiments, ordinary technicians in this field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above-mentioned embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the utility model, and should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A device for monitoring partial discharge, characterized in that Applicable to monitoring partial discharge in a switch cabinet of a power distribution system, the device comprises a sensor module, a signal processing module, a data acquisition module, a data transmission module and a battery management module; the device is communicatively connected to a monitoring terminal for monitoring partial discharge; The sensor module is used to acquire ultrasonic signals and convert the ultrasonic signals into tiny electrical signals, and send the tiny electrical signals to the signal processing module; the ultrasonic signals include internal ultrasonic signals and external ultrasonic signals; The signal processing module is used to receive the tiny electrical signal and convert the tiny electrical signal into a recognizable signal, and send the recognizable signal to the data acquisition module; The data acquisition module is used to receive the identifiable signal and acquire first spectrum data of partial discharge based on the identifiable signal, and send the first spectrum data to the data transmission module; The data transmission module is used to receive the first graph data and send the first graph data to the monitoring terminal; The battery management module is used to supply power to the sensor module, the signal processing module, the data acquisition module and the data transmission module.

2. The device for monitoring partial discharge according to claim 1, characterized in that The sensor module includes an internal sensing unit and an external sensing unit; The internal sensing unit is used to obtain the internal ultrasonic signal in the switch cabinet of the power distribution system; The external sensing unit is used to obtain an external ultrasonic signal outside the switch cabinet of the power distribution system.

3. The device for monitoring partial discharge according to claim 2, characterized in that The signal processing module is also used for: The tiny electrical signal is amplified and filtered to obtain the identifiable signal; wherein the identifiable signal includes an external identifiable signal and an internal identifiable signal.

4. The device for monitoring partial discharge according to claim 2, characterized in that: The data acquisition module is also used for: Determining identifiable features of the partial discharge based on the identifiable signal; wherein the identifiable features include external identifiable features and internal identifiable features; The first map data of the partial discharge is generated based on the identifiable features and a preset first map data rule; the first map data includes first external map data and first internal map data.

5. The device for monitoring partial discharge according to claim 4, characterized in that The data acquisition module is also used for: Determining a first characteristic parameter based on the identifiable feature; the first characteristic parameter includes a first external characteristic parameter and a first internal characteristic parameter; The first atlas data is generated based on the first characteristic parameter and the first atlas data rule.

6. The device for monitoring partial discharge according to claim 5, characterized in that The data acquisition module is also used for: Extracting a plurality of first parameters from the first characteristic parameters according to the first atlas data rule; wherein the first parameters include a first external parameter and a first internal parameter; The plurality of the first parameters are used as the first atlas data.

7. The device for monitoring partial discharge according to claim 6, characterized in that The data transmission module is also used for: Convert the first atlas data and the first characteristic parameter into a format to obtain second atlas data and a second characteristic parameter; The second atlas data and the second characteristic parameter are sent to the monitoring end according to a preset transmission protocol.

8. A monitoring terminal for monitoring partial discharge, characterized in that: Applicable to monitoring partial discharge in a switch cabinet of a power distribution system, the monitoring terminal being communicatively connected to the device for monitoring partial discharge according to any one of claims 1 to 7; The monitoring terminal is used to receive the third spectrum data and the third characteristic parameter sent by the device, and monitor the partial discharge based on the third spectrum data; The third atlas data includes third external atlas data and third internal atlas data, and the third characteristic parameter includes third external characteristic parameter and third internal characteristic parameter.

9. The monitoring terminal for monitoring partial discharge according to claim 8, characterized in that: Also used for: determining a phase difference between the third external atlas data and the third internal atlas data; Eliminating interference signals in the internal ultrasonic signal corresponding to the local discharge based on the phase difference to obtain a local discharge signal; The partial discharge is monitored based on the partial discharge signal.

10. A monitoring system for monitoring partial discharge, characterized in that: The invention is applied to monitor partial discharge in a switch cabinet of a power distribution system, comprising a device for monitoring partial discharge as described in any one of claims 1 to 7 and a monitoring terminal for monitoring partial discharge as described in any one of claims 8 to 9, wherein the device is communicatively connected to the monitoring terminal.

Images