Distribution network cable joint partial discharge detection device and method, and storage medium

Abstract

The invention relates to the technical field of cable joint detection, and discloses distribution network cable joint partial discharge detection equipment and method, and the distribution network cable joint partial discharge detection equipment comprises a fixed frame, a sound insulation sleeve, an ultrasonic detection part and a controller assembly. According to the invention, the detectable position is more flexible, and the detection range is relatively large. The invention further discloses a storage medium.

Description

Technical Field

[0001] The present application relates to the technical field of cable joint detection, for example, to partial discharge detection equipment and methods and storage media for distribution network cable joints. Background Art

[0002] At present, there may be insulation defects in the manufacturing process of cable joints. For example, when stripping the cable insulation layer, the cutter may cause tiny scratches on the main insulation. These scratches are easy to cause partial discharge under the action of the electric field. And as the operation time of the cable increases, the insulation material will gradually age. Factors such as thermal aging and electrical aging will cause the insulation performance to deteriorate, thus generating partial discharge channels. Therefore, cable joints need to be inspected regularly to ensure their safe operation.

[0003] Ultrasonic signals are generated during partial discharge. These signals can be received by installing ultrasonic sensors on the surface of cable joints. The location and intensity of partial discharge can be determined based on parameters such as the strength, frequency and propagation time of the ultrasonic signal, thereby detecting whether there is partial discharge at the cable joint.

[0004] In the related art, there is a cable joint detection device, which includes: a detection probe and a fixing component. One end of the fixing component is connected to the detection probe, and the other end of the fixing component is connected to the cable. The detection probe is fixed on the cable by the fixing component to detect the cable joint.

[0005] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art:

[0006] The detection probe detects the cable joint at a fixed position, and the detection range is relatively small.

[0007] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0008] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0009] The embodiments of the present disclosure provide a device and method for detecting partial discharge of cable joints in a distribution network, and a storage medium to increase the detection range.

[0010] In some embodiments, a device for detecting partial discharge of a distribution network cable joint includes: a fixing frame, a soundproof sleeve, an ultrasonic detector, and a controller assembly. The soundproof sleeve is detachably connected to two opposite sides of the fixing frame, wherein a detection space is defined between the fixing frame and the soundproof sleeve, and the portion of the cable with the joint crosses the detection space; the ultrasonic detector is slidably arranged on the inner side of the soundproof sleeve, and can slide laterally along the cable, and the ultrasonic detector can detect the noise amount of multiple points on the cable, wherein the multiple points include the points corresponding to the joints; the controller assembly is connected to the ultrasonic detector, and is used to calculate the absolute value of the noise at the point where the cable has the joint according to the noise amount detected by the ultrasonic detector at different points, and to determine whether partial discharge occurs at the cable joint.

[0011] In some embodiments, a method for detecting partial discharge at distribution network cable joints includes: detecting and obtaining a first noise value at a first position of the cable joint, a second noise value at a second position, and a third noise value at a third position through an ultrasonic detection device, wherein the second position is a position corresponding to the joint of the cable; calculating a noise difference based on the first noise value, the second noise value, and the third noise value; determining a current value on the cable; and determining whether there is partial discharge at the cable joint based on a relationship between the current value on the cable and the noise difference.

[0012] In some implementations, a storage medium stores program instructions, and when the program instructions are run, the method for detecting partial discharge at a distribution network cable joint as described in the above embodiment is executed.

[0013] The device and method for detecting partial discharge at a distribution network cable joint, and the storage medium provided in the embodiments of the present disclosure can achieve the following technical effects:

[0014] The sound insulation sleeve is installed at the cable joint, and the sound insulation sleeve and the fixing frame are installed together so that the cable and the cable joint are located in the detection space. Then, the ultrasonic detection component is used to detect the noise level at multiple points on the cable and the points corresponding to the cable joint. The ultrasonic detection component is slidably set on the inner side of the sound insulation sleeve. The ultrasonic detection component can detect more flexible positions and has a relatively large detection range. The values ​​detected by the ultrasonic detection component are sent to the controller component. The controller component calculates the absolute value of the noise at the point where the cable has a joint based on the noise level detected by the ultrasonic detection component at different points, and determines whether local discharge occurs at the cable joint. The detection accuracy is relatively high.

[0015] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0017] Figure 1 It is a structural schematic diagram of a partial discharge detection device for a distribution network cable joint provided by an embodiment of the present disclosure;

[0018] Figure 2 It is an exploded schematic diagram of a structural schematic diagram of a partial discharge detection device for a distribution network cable joint provided by an embodiment of the present disclosure;

[0019] Figure 3 It is an exploded schematic diagram of another structural schematic diagram of a distribution network cable joint partial discharge detection device provided by an embodiment of the present disclosure;

[0020] Figure 4 is a structural schematic diagram of a fixing frame provided by an embodiment of the present disclosure;

[0021] Figure 5 is an exploded schematic diagram of a fixing frame and a protective cover structure provided by an embodiment of the present disclosure;

[0022] Figure 6 is a schematic structural diagram of another fixing frame provided by an embodiment of the present disclosure;

[0023] Figure 7 is a schematic diagram of the internal structure of a sound insulation sleeve provided by an embodiment of the present disclosure;

[0024] Figure 8 It is a schematic diagram of a method for detecting partial discharge of a distribution network cable joint provided by an embodiment of the present disclosure.

[0025] Reference numerals:

[0026] 100, fixing frame; 110, second plug-in slot; 120, slide slot; 130, through hole; 140, tooth slot; 150, protective cover; 200, sound insulation sleeve; 201, open; 210, first plug-in slot; 220, first sound insulation board; 230, first set of wire holes; 231, first rectangular hole portion; 232, first circular hole portion; 240, second sound insulation board; 250, second set of wire holes; 251, second rectangular hole portion; 252, second circular hole portion; 253, rotating sleeve; 260, first sound insulation portion; 261, sound-absorbing hole; 2611, first ball hole; 2612, second ball hole; 2613, rectangular hole; 270, second sound insulation part; 271, first sound insulation cavity; 272, first elastic membrane; 280, third sound insulation part; 281, second sound insulation cavity; 282, second elastic membrane; 300, ultrasonic detection part; 310, connecting plate; 320, driving part; 321, motor; 322, gear; 330, ultrasonic sensor; 400, controller assembly; 500, detection space; 600, plug-in block. DETAILED DESCRIPTION

[0027] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0028] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0029] Unless otherwise stated, the term "plurality" means two or more.

[0030] The term "correspondence" may refer to an association relationship or a binding relationship. The correspondence between A and B means that there is an association relationship or a binding relationship between A and B.

[0031] Combination Figure 1As shown, in some embodiments, a partial discharge detection device for distribution network cable joints includes: a fixing frame 100, a sound insulation sleeve 200, an ultrasonic detector 300 and a controller assembly 400. The sound insulation sleeve 200 is detachably connected to two opposite sides of the fixing frame 100, wherein a detection space 500 is defined between the fixing frame 100 and the sound insulation sleeve 200, and the portion of the cable with the joint crosses the detection space 500; the ultrasonic detector 300 is slidably arranged on the inner side of the sound insulation sleeve 200, and can slide laterally along the cable, and the ultrasonic detector 300 can detect the noise amount of multiple points on the cable, wherein the multiple points include the points corresponding to the joints; the controller assembly 400 is connected to the ultrasonic detector 300, and is used to calculate the absolute value of the noise at the point where the cable has the joint according to the noise amount detected by the ultrasonic detector 300 at different points, and judge whether the joint of the cable has partial discharge.

[0032] The partial discharge detection device for distribution network cable joints provided by the embodiment of the present disclosure is used, and the sound insulation sleeve 200 is set on the cable joint, and the sound insulation sleeve 200 and the fixing frame 100 are installed together, so that the cable and the cable joint are located in the detection space 500. Then, the ultrasonic detection component 300 is used to detect the noise amount at multiple points on the cable and the points corresponding to the cable joint, and the ultrasonic detection component 300 is slidably set on the inner side of the sound insulation sleeve 200. The ultrasonic detection component 300 can detect more flexible positions and the detection range is relatively large. The value detected by the ultrasonic detection component 300 is sent to the controller component 400. The controller component 400 calculates the absolute value of the noise at the point where the cable has a joint according to the noise amount detected by the ultrasonic detection component 300 at different points, and determines whether partial discharge occurs at the cable joint. The detection accuracy is relatively high.

[0033] It can be understood that, through the cooperation between the sound insulation sleeve 200 and the fixing frame 100, it is possible to block external noise, reduce the impact of external noise on the detection operation, and improve the accuracy of the detection.

[0034] It can be understood that the controller component 400 is a conventional control module, which is a conventional technical means and a well-known technology in the art.

[0035] Combination Figure 2 As shown, optionally, an opening 201 is provided on the sound insulation sleeve 200, and the edge of the opening 201 is detachably connected to the two sides opposite to the fixing frame 100. In this way, the cable can be loaded into the sound insulation sleeve 200 through the opening 201 of the sound insulation sleeve 200, and the sound insulation sleeve 200 is then installed on the fixing frame 100, which is more convenient to install and has a relatively good user experience.

[0036] Optionally, the two ends of the sound insulation sleeve 200 are provided with a first plug-in slot 210, the two ends of the fixing frame 100 are provided with a second plug-in slot 110, one end of the plug-in block 600 is plugged into the first plug-in slot 210, and the other end of the plug-in block 600 is plugged into the second plug-in slot 110. In this way, by plugging one end of the plug-in block 600 into the first plug-in slot 210 and the other end of the plug-in block 600 into the second plug-in slot 110, the sound insulation sleeve 200 and the fixing frame 100 are installed together, and the installation is more convenient. Similarly, the plug-in block 600 is taken out from the first plug-in slot 210 and the second plug-in slot 110, so that the sound insulation sleeve 200 and the fixing frame 100 can be separated, and the disassembly is more convenient.

[0037] Optionally, one first plug slot 210 is connected to one second plug slot 110. In this way, the first plug slot 210 is connected to the second plug slot 110, and the plug block 600 can be plugged into the first plug slot 210 and the second plug slot 110 at the same time, which is convenient for plugging and installation.

[0038] Optionally, when the plug-in block 600 is plugged into the first slot, the plug-in block 600 is flush with the end surface of the sound insulation sleeve 200 or is retracted into the end surface of the sound insulation sleeve 200. In this way, when the plug-in block 600 is flush with the end surface of the sound insulation sleeve 200, and when the plug-in block 600 is retracted into the end surface of the sound insulation sleeve 200, the integrity is relatively good. And when the plug-in block 600 protrudes from the end surface of the sound insulation sleeve 200, the plug-in block 600 is easily scratched, and the risk of detaching from the first plug-in slot 210 is relatively large.

[0039] Optionally, when the plug-in block 600 is plugged into the second slot, the plug-in block 600 is flush with the end surface of the fixing frame 100 or is retracted into the end surface of the fixing frame 100. In this way, when the plug-in block 600 is flush with the end surface of the fixing frame 100, and when the plug-in block 600 is retracted into the end surface of the fixing frame 100, the integrity is relatively good. In addition, when the plug-in block 600 protrudes from the end surface of the fixing frame 100, the plug-in block 600 is easily scratched, and the risk of detaching from the second plug-in slot 110 is relatively high.

[0040] Optionally, both ends of the sound insulation sleeve 200 are provided with a first sound insulation board 220, and the first sound insulation board 220 is provided with a first set of wire holes 230, and the first set of wire holes 230 are connected with the opening 201. In this way, the cable can be inserted into the first set of wire holes 230 through the opening 201, and then the sound insulation sleeve 200 is installed on the fixing frame 100. The first sound insulation board 220 can cover the openings at both ends of the sound insulation sleeve 200, further reduce the influence of external noise on the detection operation, and improve the accuracy of the detection.

[0041] Specifically, the first cable hole 230 is provided with a first rectangular hole portion 231 and a first circular hole portion 232 which are connected to each other, and the first rectangular hole portion 231 is connected to the opening 201. Thus, the cable passes through the opening 201 along the first rectangular hole portion 231 and is installed into the first circular hole portion 232.

[0042] Optionally, the diameter of the first circular hole 232 is greater than the width of the first rectangular hole 231. In this way, the diameter of the first circular hole 232 is relatively large, and the width of the first rectangular hole 231 is relatively small, so that the cable in the first circular hole 232 is not easy to come out of the first circular hole 232.

[0043] Optionally, the first sound insulation board 220 is flush with the end surface of the sound insulation sleeve 200. In this way, the integrity is relatively good.

[0044] Combination Figure 3 As shown, optionally, a second sound insulation board 240 is rotatably provided on one side of each first sound insulation board 220, and a second set of wire holes 250 are provided on the second sound insulation board 240, and the second set of wire holes 250 can be communicated with the opening 201. In this way, when the first set of wire holes 230 are communicated with the opening 201, the first set of wire holes 230 and the second set of wire holes 250 overlap, so that the cable can be installed in the first set of wire holes 230 and the second set of wire holes 250. The second sound insulation board 240 is rotated again so that the second set of wire holes 250 is no longer communicated with the opening 201, and the second sound insulation board 240 can block part of the first set of wire holes 230, further reducing the influence of external noise on the detection operation and improving the accuracy of the detection.

[0045] Optionally, the second cable hole 250 is provided with a second rectangular hole portion 251 and a second circular hole portion 252 that are connected to each other, the second rectangular hole portion 251 can be connected to the opening 201 and the first rectangular hole portion 231, and a rotating sleeve 253 is provided at the edge of the second circular hole portion 252, and the rotating sleeve 253 is rotatably connected to the first circular hole portion 232. In this way, when the second rectangular hole portion 251 is connected to the opening 201 and the second rectangular hole portion 251 overlaps with the first rectangular hole portion 231, the cable can be installed into the second circular hole portion 252 and the rotating sleeve 253 from the opening 201 and along the first rectangular hole portion 231 and the second rectangular hole portion 251, or the cable can be removed from the second circular hole portion 252 and the rotating sleeve 253 along the first rectangular hole portion 231 and the second rectangular hole portion 251. The second sound insulation plate 240 is rotated, and the rotating sleeve 253 is rotated in the first circular hole portion 232 until the second rectangular hole portion 251 is no longer connected to the opening 201, and the second rectangular hole portion 251 is misaligned with the first rectangular hole portion 231, and the second sound insulation plate 240 then blocks the first rectangular hole portion 231, further reducing the impact of external noise on the detection operation and improving the accuracy of the detection.

[0046] Combination Figure 4, Figure 5 and Figure 6 As shown, optionally, a slide groove 120 is provided on the fixing frame 100, and the ultrasonic detection member 300 is arranged to slide in the slide groove 120. In this way, the slide groove 120 provides a sliding guide for the ultrasonic detection member 300, reducing the risk of deviation of the ultrasonic detection member 300 during the sliding process.

[0047] Optionally, a side wall of the ultrasonic detector 300 facing away from the chute 120 is flush with the groove edge of the chute 120 or is retracted into the chute 120. In this way, when the ultrasonic detector 300 protrudes from the groove edge of the chute 120, there is a greater risk of friction and scratching between the cable connector and the ultrasonic detector 300. Therefore, a side wall of the ultrasonic detector 300 facing away from the chute 120 is flush with the groove edge of the chute 120 or is retracted into the chute 120, which can reduce the risk of friction and scratching of the ultrasonic detector 300 and improve the durability of the ultrasonic detector 300.

[0048] Optionally, a through hole 130 is provided on the side wall of the chute 120, and a connecting plate 310 is provided on one side wall of the ultrasonic detector 300 facing the chute 120, and one end of the connecting plate 310 facing away from the ultrasonic detector 300 passes through the through hole 130, and one end of the connecting plate 310 facing away from the ultrasonic detector 300 is provided with a driving member 320. In this way, the driving member 320 drives the connecting plate 310 to slide in the through hole 130, and the connecting plate 310 further drives the ultrasonic detector 300 to slide in the chute 120, so as to realize automatic adjustment of the position of the ultrasonic detector 300, and after the ultrasonic detector 300 reaches the specified position, the ultrasonic detector 300 detects the noise value and sends the noise value to the controller component 400.

[0049] It can be understood that the driving member 320 is located outside the detection space 500, and the fixing frame 100 can shield the noise generated by the driving member 320, reduce the influence of the noise of the driving member 320 on the detection operation, and improve the detection accuracy.

[0050] Optionally, the driving member 320 includes: a motor 321 and a gear 322. The motor 321 is disposed on the connecting plate 310; the gear 322 is connected to the output end of the motor 321 and meshes with the tooth groove 140 on the fixing frame 100. In this way, the motor 321 provides power for the gear 322 to rotate, and the gear 322 cooperates with the tooth groove 140 to make the connecting plate 310 slide in the through hole 130, and the connecting plate 310 further drives the ultrasonic detection member 300 to slide in the slide groove 120, so as to realize automatic adjustment of the position of the ultrasonic detection member 300.

[0051] Optionally, the ultrasonic detection member 300 is an ultrasonic sensor 330. In this way, the noise value of the cable and the cable connector is detected by the ultrasonic sensor 330, and the noise value is sent to the controller component 400.

[0052] Specifically, the ultrasonic sensor 330 is fixedly connected to the connecting plate 310 .

[0053] Optionally, a protective cover 150 is provided on the fixing frame 100, and the protective cover 150 is provided on the outside of the driving member 320, and the driving member 320 can move between the protective cover 150 and the fixing frame 100. In this way, the protective cover 150 can shield the through hole 130, reduce the influence of external noise on the detection operation, and improve the accuracy of the detection.

[0054] Combination Figure 7 As shown, optionally, the sound insulation sleeve 200 includes: a first sound insulation part 260, a second sound insulation part 270 and a third sound insulation part 280. A plurality of sound absorbing holes 261 are provided in the first sound insulation part 260; a plurality of first sound insulation cavities 271 are provided in the second sound insulation part 270, and a first elastic membrane 272 is provided in each first sound insulation cavity 271; a plurality of second sound insulation cavities 281 are provided in the third sound insulation part 280, and a second elastic membrane 282 is provided in each second sound insulation cavity 281; wherein, the first sound insulation part 260 is arranged on the outside of the second sound insulation part 270, and the second sound insulation part 270 is arranged on the outside of the third sound insulation part 280. In this way, when external noise enters the plurality of sound absorbing holes 261 in the first sound insulation part 260, it will be reflected multiple times in the plurality of sound absorbing holes 261, thereby reducing the intensity of external noise, reducing the influence of external noise on the detection operation, and improving the accuracy of detection. Similarly, the first soundproofing cavity 271 of the second soundproofing part 270 and the second soundproofing cavity 281 of the third soundproofing part 280 can also reduce the intensity of external noise, reduce the impact of external noise on the detection operation, and improve the accuracy of the detection. In addition, a first elastic membrane 272 is provided in the first soundproofing cavity 271, and a second elastic membrane 282 is provided in the second soundproofing cavity 281. When noise is transmitted to the first elastic membrane 272 and the second elastic membrane 282, the first elastic membrane 272 and the second elastic membrane 282 will vibrate, so that the sound energy is converted into mechanical kinetic energy, which effectively eliminates the impact of noise on the detection operation.

[0055] Optionally, the plurality of sound-absorbing holes 261 include: a plurality of first spherical holes 2611, a plurality of second spherical holes 2612, and a plurality of rectangular holes 2613. The plurality of first spherical holes 2611 are located outside the plurality of second spherical holes 2612, and the plurality of second spherical holes 2612 are located outside the plurality of rectangular holes 2613; wherein the aperture of the first spherical holes 2611 is smaller than the aperture of the second spherical holes 2612. In this way, the plurality of first spherical holes 2611 and the plurality of second spherical holes 2612 can both reduce the intensity of external noise, reduce the impact of external noise on the detection operation, and improve the accuracy of the detection. Moreover, the diameter of the second spherical hole 2612 is different from that of the first spherical hole 2611, and can handle noise of different frequencies. The plurality of rectangular holes 2613 have a relatively large area for blocking noise, and can better block the remaining noise.

[0056] Optionally, both the first elastic membrane 272 and the second elastic membrane 282 are arc-shaped membranes, and the area of ​​the second elastic membrane 282 is smaller than that of the first elastic membrane 272. In this way, the area of ​​the second elastic membrane 282 is different from that of the first elastic membrane 272, and noises of different frequencies can be processed.

[0057] Specifically, the first elastic membrane 272 is bent toward the first hole portion, and the second elastic membrane 282 is bent away from the first hole portion.

[0058] It can be understood that the first sound insulation board 220, the second sound insulation board 240, the fixing frame 100 and the protective cover 150 are all made of sound insulation materials or have sound insulation layers on their surfaces.

[0059] Combination Figure 8 As shown, in some embodiments, a method for detecting partial discharge at a distribution network cable joint includes:

[0060] S010, the controller component detects and obtains a first noise value at a first position of the cable joint, a second noise value at a second position, and a third noise value at a third position through an ultrasonic detection member, wherein the second position is a position corresponding to the joint of the cable;

[0061] S020, the controller component calculates a noise difference value according to the first noise value, the second noise value and the third noise value; and determines a current value on the cable;

[0062] S030, the controller component determines whether there is partial discharge at the cable joint according to the relationship between the current value on the cable and the noise difference.

[0063] The embodiment of the present disclosure provides a method for detecting partial discharge of a distribution network cable joint, wherein an ultrasonic detection component obtains a first noise value at a first position of the cable joint, a second noise value at a second position of the cable at one end of the cable joint, and a third noise value at a third position of the cable at the other end of the cable structure. The controller component then calculates a noise difference based on the first noise value, the second noise value, and the third noise value, and the controller component determines whether there is partial discharge at the cable joint based on the relationship between the current value on the cable and the noise difference, and the detection accuracy is relatively high.

[0064] Optionally, detecting and obtaining a first noise value at a first position of the cable joint, a second noise value at a second position, and a third noise value at a third position by an ultrasonic detector includes: moving the same ultrasonic detector to the first position, the second position, and the third position, respectively, to detect the first noise value, the second noise value, and the third noise value, respectively. In this way, the ultrasonic detector moves to the first position and then obtains the first noise value, and the distance to the cable joint is relatively close, so the obtained value is more accurate. Similarly, the ultrasonic detector obtains the second noise value and the third noise value with relatively high accuracy.

[0065] Specifically, the second position is located on the cable connector, and the first position and the third position are located on the cables on the left and right sides of the cable connector, respectively.

[0066] Optionally, a detection cycle is set to be T. In a detection cycle, the ultrasonic detection element stays at the first position for t1 time to obtain a first noise value, then moves to the third position and stays for t3 time to obtain a third noise value, and finally moves to the second position and stays for t2 time to obtain a second noise value; wherein t1 is equal to t3, and t2 is greater than t1. In this way, in a detection cycle, the first position is first detected for t1 time, then the third position is detected for t3 time, and then the second position is detected for t2 time. During the detection of the second position, the noise difference can be calculated in real time to determine whether there is partial discharge in the cable joint. In addition, in a detection cycle, the time of staying at the second position is relatively long, and the time of real-time calculation and detection is relatively long, so that it can be discovered in time when a discharge fault occurs in the cable joint.

[0067] Optionally, t1 is one tenth of T, and t2 is eight tenths of T. In this way, in one detection cycle, the time of staying in the second position is relatively long, the time of real-time calculation and detection is relatively long, and when a discharge fault occurs in the cable joint, the time of detection and discovery is relatively short.

[0068] For example, if T is 5 minutes, t1 is 0.5 minutes, t3 is 0.5 minutes, and t2 is 4 minutes.

[0069] Optionally, the ultrasonic detection element staying at the first position for t1 time to obtain the first noise value includes: continuously detecting the noise at the first position for t1 time, and calculating the average value to obtain the first noise value. The third noise value is obtained in the same way as the first noise value.

[0070] Optionally, moving to the second position and staying for t2 time to obtain the second noise value includes: obtaining the second noise value once at a set time interval during t2 time; wherein the set time interval is the same as t1. In this way, the second noise value is obtained once at a set time interval, and then the noise difference is calculated once to determine whether there is partial discharge at the cable joint, thereby ensuring the detection effect while requiring relatively less calculation amount.

[0071] In some other optional embodiments, the same ultrasonic detection element is moved to the first position, the second position and the third position respectively to detect the first noise value, the second noise value and the third noise value respectively, including: after the ultrasonic detection element moves to the first position, the first noise value on the cable is detected again, and the ultrasonic detection element detects a preset number of times to obtain multiple noise values, and sends the multiple noise values ​​to the controller component, and the controller component calculates the average value of the multiple noise values ​​to determine the first noise value. In this way, by detecting a preset number of times to obtain multiple noise values, and calculating the average value of the multiple noise values, the detection error is reduced and the detection accuracy is improved.

[0072] Specifically, the preset number of times is greater than or equal to four times and less than or equal to eight times. In this way, the influence of measurement errors is reduced, and the measurement time is relatively short, thereby ensuring the measurement accuracy and improving the measurement efficiency.

[0073] Specifically, the preset number of times is equal to five times.

[0074] Optionally, the controller component calculates an average value of multiple noise values ​​to determine the first noise value, including: the controller component excludes a maximum value and a minimum value from the multiple noise values, and then determines the average value of the remaining noise values ​​as the first noise value. In this way, after excluding a maximum value and a minimum value, the influence of current fluctuations on the measurement can be reduced, and the measurement accuracy is relatively high.

[0075] Exemplarily, the ultrasonic detection element moves to the first position, detects five times to obtain five noise values, and after excluding the largest value and the smallest value of the five noise values, the average value of the remaining three values ​​is calculated and determined as the first noise value.

[0076] Optionally, the ultrasonic detection part detects multiple times to obtain multiple noise values, including: after each detection by the ultrasonic detection part, the next detection is performed after a preset time interval. In this way, by setting the preset time interval, it is ensured that there is an interval between the multiple noise values ​​detected, avoiding multiple detections in a short period of time, and the accuracy of the values ​​is relatively high, thereby improving the accuracy of the detection.

[0077] Optionally, the preset time is greater than or equal to 0.5 seconds and less than or equal to 1.5 seconds.

[0078] Specifically, the preset time is equal to 1 second.

[0079] Exemplarily, after the ultrasonic detection component completes the first detection, it performs the second detection after an interval of 1 second. After the second detection is completed, it performs the third detection after 1 second, and so on.

[0080] Optionally, within a detection cycle, the ultrasonic detection element first moves to the first position for detection, then moves to the third position for detection, and finally stays at the second position for detection, wherein the first set number of detections is performed at the first position, the second set number of detections is performed at the second position, and the third set number of detections is performed at the third position, the first set number of detections is equal to the third set number of detections, the second set number of detections is n times the first set number of detections, and when detecting the second position, a second noise value is obtained each time the second set number of detections is completed. In this way, the ultrasonic detection element first moves to the first position and the third position for detection, and then moves to the second position for detection, and a second noise value is obtained each time the second set number of detections is completed at the second position, thereby realizing calculation of multiple noise differences within a detection cycle, and the detection effect is relatively good, and the discharge fault of the cable joint can be discovered in a relatively timely manner. Moreover, the second set number of detections is n times the first set number of detections, so that the time for calculating the noise difference at the second position where the detection element stays is relatively long, which increases the monitoring time.

[0081] Specifically, n is equal to 4.

[0082] For example, the first set number of times is 10 times, the third set number of times is 10 times, and the second set number of times is 40 times. Each time the second set number of times of detection is completed, a second noise value is obtained, and 40 second noise values ​​can be obtained, and then 40 noise differences are calculated.

[0083] Optionally, the noise difference is calculated according to the first noise value, the second noise value and the third noise value, including: the controller component calculates according to the formula: V=V2-(V1+V3) / 2; wherein V is the noise difference, V1 is the first noise value, V2 is the second noise value, and V3 is the third noise value. In this way, the first noise value and the third noise value are both values ​​on the cable, and the noise difference is the second noise value minus the average of the first noise value and the third noise value, which can reduce the influence of the measurement error and make the accuracy of the noise difference relatively high.

[0084] Exemplarily, when the first noise value is 21.5 decibels, the second noise value is 21.8 decibels, and the third noise value is 21.6 decibels, the noise difference is 0.25.

[0085] Optionally, according to the relationship between the current value and the noise difference value on the cable, determining whether there is partial discharge at the joint of the cable includes: the controller component calculates A=aI, where A is a reference value, a is a proportionality coefficient, and I is a current value; if the controller component determines that the value of V is greater than A, it is determined that the joint of the cable has partial discharge, otherwise it is determined that the joint of the cable has not partial discharge. In this way, since different currents pass through the cable, the noise generated by it is also different. By setting the proportionality coefficient, the reference value is the same as the noise value generated under normal circumstances, thereby realizing the judgment of whether there is partial discharge at the cable joint, and the accuracy is relatively high.

[0086] Optionally, a is greater than or equal to 0.02 and less than or equal to 0.03. In this way, the size of the proportional coefficient can be determined according to the thickness of the insulation layer of the cable joint to improve the accuracy of the detection. For example, when the thickness of the insulation layer is large, a is equal to 0.02. When the thickness of the insulation layer is thin, a is equal to 0.03.

[0087] Specifically, a is equal to 0.26.

[0088] Optionally, the controller assembly is provided with an alarm module, which sounds an alarm when it is determined that a partial discharge occurs at the joint of the cable, so that an alarm can be sounded to the inspector in time and the fault can be eliminated in time.

[0089] It can be understood that the alarm module is a conventional alarm module, such as a light alarm, a sound alarm and other well-known technical means.

[0090] An embodiment of the present disclosure provides a storage medium storing computer executable instructions, wherein the computer can execute the method for detecting partial discharge at a distribution network cable joint as in the above embodiment.

[0091] The above-mentioned storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0092] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiment of the present disclosure. The aforementioned storage medium may be a non-transient storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes, or a transient storage medium.

[0093] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible changes. Unless explicitly required, separate components and functions are optional, and the order of operation may vary. The parts and features of some embodiments may be included in or replace the parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates, the singular forms of "a", "an" and "the" are intended to include plural forms as well. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of listings containing one or more associated ones. In addition, when used in the present application, the term "comprise" and its variants "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method or device comprising the elements. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can refer to the description of the method part.

[0094] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods for each specific application to implement the described functions, but such implementations should not be considered to exceed the scope of the embodiments of the present disclosure. The technicians may clearly understand that, for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above may refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0095] In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units can be only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to implement this embodiment. In addition, each functional unit in the embodiment of the present disclosure may be integrated in a processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit.

[0096] The flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to the embodiment of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. In the description corresponding to the flowchart and the block diagram in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in a different order from the order disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified functions or actions, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A partial discharge detection device for distribution network cable joints, characterized in that: include: Fixed frame (100); A soundproof sleeve (200) is detachably connected to two sides opposite to the fixing frame (100), wherein a detection space (500) is defined between the fixing frame (100) and the soundproof sleeve (200), and a portion of the cable with a connector crosses the detection space (500); The ultrasonic detection member (300) is slidably disposed on the inner side of the sound insulation sleeve (200) and can slide laterally along the cable. The ultrasonic detection member (300) can detect the noise level at multiple points on the cable, wherein the multiple points include points corresponding to the joints. The controller component (400) is connected to the ultrasonic detection element (300) and is used to calculate the absolute value of the noise at the point where the cable has a joint according to the noise amount detected by the ultrasonic detection element (300) at different points, and to determine whether partial discharge occurs at the cable joint.

2. The partial discharge detection device for distribution network cable joints according to claim 1 is characterized in that: The sound insulation sleeve (200) is provided with an opening (201), and the edge of the opening (201) is detachably connected to two opposite sides of the fixing frame (100).

3. The partial discharge detection device for distribution network cable joints according to claim 2 is characterized in that: Both ends of the sound insulation sleeve (200) are provided with a first sound insulation board (220), and the first sound insulation board (220) is provided with a first set of wire holes (230), and the first set of wire holes (230) is communicated with the opening (201).

4. The partial discharge detection device for distribution network cable joints according to claim 3 is characterized in that: A second sound insulation board (240) is rotatably provided on one side of each first sound insulation board (220), and a second set of wire holes (250) is provided on the second sound insulation board (240), and the second set of wire holes (250) can be communicated with the opening (201).

5. The partial discharge detection device for distribution network cable joints according to any one of claims 1 to 4, characterized in that: A slide groove (120) is provided on the fixing frame (100), and the ultrasonic detection component (300) is arranged to slide in the slide groove (120).

6. The partial discharge detection device for distribution network cable joints according to claim 5 is characterized in that: A through hole (130) is provided on a side wall of the slide groove (120); a connecting plate (310) is provided on a side wall of the ultrasonic detection member (300) facing the slide groove (120); an end of the connecting plate (310) facing away from the ultrasonic detection member (300) passes through the through hole (130); and a driving member (320) is provided on an end of the connecting plate (310) facing away from the ultrasonic detection member (300).

7. The partial discharge detection device for distribution network cable joints according to claim 6 is characterized in that: The driving member (320) comprises: A motor (321) is arranged on the connecting plate (310); The gear (322) is connected to the output end of the motor (321) and meshes with the tooth groove (140) on the fixing frame (100).

8. A method for detecting partial discharge of distribution network cable joints, characterized in that: include: Detecting and obtaining a first noise value at a first position of a cable joint, a second noise value at a second position, and a third noise value at a third position by an ultrasonic detection member, wherein the second position is a position corresponding to the joint of the cable; Calculating a noise difference value according to the first noise value, the second noise value and the third noise value; Determine the value of the current flowing through the cable; Based on the relationship between the current value on the cable and the noise difference, determine whether there is partial discharge at the cable joint.

9. The method for detecting partial discharge of distribution network cable joints according to claim 8, characterized in that: Detecting and obtaining a first noise value at a first position, a second noise value at a second position, and a third noise value at a third position of a cable joint by an ultrasonic detection member includes: The same ultrasonic detection element is moved to the first position, the second position and the third position respectively to detect the first noise value, the second noise value and the third noise value respectively.

10. A storage medium storing program instructions, characterized in that: When the program instructions are run, the method for detecting partial discharge at distribution network cable joints as described in any one of claims 8 to 9 is executed.

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