Multi-station partial discharge detection assembly

Abstract

The utility model discloses a multi-station partial discharge detection assembly, belongs to the technical field of safety detection equipment, and provides a multi-station detection assembly capable of monitoring partial discharge in real time, the multi-station partial discharge detection assembly comprises a packaging box, the packaging box comprises a shielding shell, a circuit board is arranged in the shielding shell, and the circuit board is electrically connected with a processing unit. The processing unit is fixedly connected to the side wall of the shielding shell, the processing unit is further electrically connected with a first signal line and a second signal line, the tail end of the first signal line extends out of the shielding shell and is connected with a ground electric wave partial discharge sensor, and the tail end of the second signal line extends out of the shielding shell and is connected with an ultrasonic sensor. The ultrasonic sensor is arranged in the high-voltage switch cabinet, the ground electric wave partial discharge sensor is arranged on the outer surface of the high-voltage switch cabinet, whether partial discharge occurs in the switch cabinet or not is comprehensively judged according to two physical states of sound waves and electric waves associated with partial discharge, and judgment is more accurate and timely.

Description

Technical Field

[0001] The present application relates to the technical field of safety detection equipment, and in particular to a multi-station partial discharge detection component. Background Art

[0002] There is a greater potential difference inside the high-voltage switchgear, so the probability of partial discharge is greater. When the air is broken down, the current flows from one component to the remaining component, causing damage to the component. Although this damage may not immediately affect the normal operation of the switchgear, it will affect the stable operation and service life of the switchgear, and it needs to be replaced during maintenance. However, the staff cannot determine whether partial discharge has occurred during the maintenance interval, and it is even more difficult to find which components have been damaged by partial discharge. Summary of the invention

[0003] The purpose of the present application is to provide a multi-station detection component capable of monitoring partial discharge in real time.

[0004] To achieve the above objectives, the present application provides a multi-station partial discharge detection component: comprising a packaging box, the packaging box comprising a shielding shell, a circuit board is arranged inside the shielding shell, the circuit board is electrically connected to a processing unit, the processing unit is fixedly connected to the side wall of the shielding shell, the processing unit is also electrically connected to a first signal line and a second signal line, the end of the first signal line extends to the outside of the shielding shell and is connected to a ground wave partial discharge sensor, the ground wave partial discharge sensor is fixedly connected to the outer surface of the shell of the high-voltage switch cabinet, the end of the second signal line extends to the outside of the shielding shell and is connected to an ultrasonic sensor, the ultrasonic sensor is arranged inside the high-voltage switch cabinet to obtain ultrasonic vibration with a larger amplitude.

[0005] Preferably, the shielding shell is made of alloy material, and the inner and outer walls are coated with insulating coating. The circuit board in the shielding shell includes a signal analysis module and a communication module, which are used to determine whether partial discharge occurs and notify the responsible staff when it is determined that partial discharge occurs.

[0006] As a preference, the first signal line and the second signal line are connected to the processing unit via a same cable tie, and one processing unit collects two signals simultaneously.

[0007] Preferably, the first signal line and the second signal line passing through the same wiring harness, and the correspondingly connected ground wave partial discharge sensor, ultrasonic sensor and processing unit form a group, and there are several combinations of the first signal line, the second signal line, the ground wave partial discharge sensor, the ultrasonic sensor and the processing unit, so the detection component has multiple detection stations.

[0008] Preferably, the plurality of processing units are arranged equidistantly along the side wall of the shielding shell, and the shielding shell is mostly in the shape of a regular polygonal column.

[0009] Preferably, one end face of the shielding shell is provided with a heat dissipation rib, and the other end face is fixedly connected with a fitting disk, and the end face of the shielding shell is provided with a second connecting hole penetrating the fitting disk; a cable through hole penetrating the two end faces is provided in the center of the shielding shell, and the end face of the fitting disk is provided with a makeshift groove connected to the cable through hole, which is used to fit with the plastic sleeve arranged on the outer casing of the cable.

[0010] Preferably, the ground wave partial discharge sensor comprises a dust cover fixedly connected to the end of the first signal line, the dust cover having an open cavity, the dust cover being fixedly connected to a wave detection end in the open cavity, and the dust cover being provided with a first connecting hole for screws and other connecting parts to pass through and fix the dust cover to the outer surface of the cabinet body of the high-voltage switch cabinet.

[0011] Preferably, the ultrasonic sensor comprises a corrugated sleeve fixedly connected to the end of the second signal line, the corrugated sleeve is fixedly connected to a plug-in sleeve via a limiting ring, and an ultrasonic detection end is provided at the end of the plug-in sleeve away from the corrugated sleeve, which can convert a high-frequency vibration signal into an electrical signal.

[0012] Compared with the prior art, the beneficial effects of this application are:

[0013] (1) By configuring an ultrasonic sensor inside the high-voltage switch cabinet and a ground wave partial discharge sensor on the outer surface of the high-voltage switch cabinet, the two physical states of sound waves and radio waves associated with partial discharge can be used to comprehensively judge whether partial discharge occurs inside the switch cabinet. The judgment is more accurate and timely. The detection component can be integrated into the high-voltage switch cabinet to achieve real-time monitoring;

[0014] (2) The inspection group has multiple workstations, which can use the time difference between the partial discharge signals detected by the sensor to locate the location where the partial discharge occurs, so that it is convenient for the staff to determine the components damaged by the partial discharge, thereby improving the efficiency of inspection and maintenance operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a first stereoscopic schematic diagram of the overall structure of the multi-station partial discharge detection assembly;

[0016] Figure 2 It is a second stereoscopic schematic diagram of the overall structure of the multi-station partial discharge detection assembly;

[0017] Figure 3 A first three-dimensional structural view of the connection between the sensor and the packaging shell of the multi-station partial discharge detection assembly;

[0018] Figure 4For the multi-station partial discharge detection component Figure 3 A local enlarged view of point A;

[0019] Figure 5 A second three-dimensional structural view of the connection between the sensor and the packaging shell of the multi-station partial discharge detection assembly;

[0020] Figure 6 For the multi-station partial discharge detection component Figure 5 A partial enlarged view of point B;

[0021] Figure 7 A partial cross-sectional view of a first three-dimensional structure of a packaging shell of the multi-station partial discharge detection component;

[0022] Figure 8 It is a partial cross-sectional view of the second three-dimensional structure of the packaging shell of the multi-station partial discharge detection component.

[0023] In the figure: 1. first signal line; 2. second signal line; 3. ground wave partial discharge sensor; 301. dust cover; 302. open cavity; 303. first connecting hole; 304. wave detection end; 4. ultrasonic sensor; 401. corrugated sleeve; 402. limit ring; 403. plug sleeve; 404. ultrasonic detection end; 5. packaging box; 501. shielding shell; 502. bonding plate; 503. cable through hole; 504. make way groove; 505. heat dissipation rib; 506. second connecting hole; 507. processing unit; 508. cable harness sleeve. DETAILED DESCRIPTION

[0024] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0025] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0026] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0027] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0028] like Figure 1-8 The multi-station partial discharge detection assembly shown includes a packaging box 5 with multiple components inside. The packaging box 5 includes a shielding shell 501 made of an alloy material, generally an aluminum alloy, which can produce an electromagnetic shielding effect. In order to reduce the probability of short circuit between the internal components of the packaging box 5 and the external circuit, an insulating coating is coated on the inner and outer walls of the packaging box 5, so that even if the conductive element contacts the packaging box 5, there will be no discharge. A heat dissipation rib 505 is provided on one end face of the shielding shell 501 to increase the external surface area of ​​the shielding shell 501 and improve the heat dissipation efficiency of the internal electrical components when working. The other end face of the shielding shell 501 is fixedly connected with a bonding plate 502. The material used for the bonding plate 502 is consistent with that of the shielding shell 501, and the surface is also coated with an insulating coating, but it is not integrally formed with the shielding shell 501. The bonding plate 502 is equivalent to the shielding shell 501. The cover is opened to facilitate installation of various electrical components into the shielding shell 501, and in order to form a closed electromagnetic shielding space in the shielding shell 501, an insulating layer is not coated on the bonding surface of the bonding disk 502 and the shielding shell 501, so that the metal materials of the bonding disk 502 and the shielding shell 501 can be in direct contact, and the end face of the shielding shell 501 is provided with a second connecting hole 506 that passes through the bonding disk 502, for bolts and other connecting parts to pass through, so as to fix the entire packaging box 5 on the outer shell of the high-voltage switch cabinet; a cable through hole 503 that passes through both end faces is provided in the center of the shielding shell 501, for the cable to pass through from the outside of the high-voltage switch cabinet into the high-voltage switch cabinet, and a makeshift groove 504 that is connected to the cable through hole 503 is provided on the end face of the bonding disk 502, which is used to fit with the plastic sleeve on the cable to avoid direct contact between the packaging box 5 and the cable and scratching the protective layer of the cable.

[0029] A circuit board is arranged in the shielding shell 501. The circuit board is powered by the line in the high-voltage switch cabinet. The circuit board has a signal analysis module and a communication module. The signal analysis module is used to analyze the physical signals related to partial discharge, so as to determine whether partial discharge has occurred in the high-voltage switch cabinet; and the communication module is used to send the signal of partial discharge to the responsible staff after the partial discharge is detected. The communication module can use wired communication or wireless communication, which belongs to the field of electricity and is a prior art. It will not be repeated here. The circuit board is electrically connected to the processing unit 507, and the processing unit 507 is a small electrical device encapsulated in a plastic shell. The circuit board is used to collect detection signals, and only one detection end is used to collect one type of signal. The processing unit 507 is fixedly connected to the side wall of the shielding shell 501 and will slightly protrude from the outer surface of the shielding shell 501. The processing unit 507 is also electrically connected to the first signal line 1 and the second signal line 2, which are physical lines for transmitting the detected electrical signals. The first signal line 1 and the second signal line 2 are connected to the processing unit 507 through the same cable sleeve 508. The cable sleeve 508 is made of soft and tough material and is directly fixedly connected to the plastic shell of the processing unit 507 to enhance the connection strength between the signal line and the processing unit 507 and reduce the probability of being pulled apart.

[0030] The end of the first signal line 1 extends to the outside of the shielding shell 501 and is connected to a ground wave partial discharge sensor 3, which can accurately capture the weak electrical signal generated when partial discharge occurs, and has the advantages of high efficiency, timeliness and high safety. Since a ground wave is generated during partial discharge and transmitted to the underground through the outer surface of the metal shell of the equipment, the ground wave partial discharge sensor 3 is usually fixedly connected to the outer surface of the shell of the high-voltage switch cabinet, which can bring higher detection accuracy. The ground wave partial discharge sensor 3 includes a dust cover 301 fixedly connected to the end of the first signal line 1. The dust cover 301 is made of insulating material and has an open cavity 302. The open cavity 302 usually passes through the end face of the dust cover 301. The dust cover 301 is fixedly connected with a radio wave detection end 304 in the open cavity 302. The radio wave detection end 304 is made of metal material, but does not directly contact the shell of the high-voltage switch cabinet to avoid conductivity to ensure high sensitivity. A first connecting hole 303 is opened on the dust cover 301 for screws and other connecting parts to pass through to fix the dust cover 301 to the outer surface of the shell of the switch cabinet.

[0031] The end of the second signal line 2 extends to the outside of the shielding shell 501, and its length is determined according to actual conditions. The end of the second signal line 2 is connected to an ultrasonic sensor 4, which can detect high-frequency vibrations caused by partial discharge. The ultrasonic sensor 4 is usually placed inside the high-voltage switch cabinet without the obstruction of the cabinet body, has better sound field strength, and can ensure the detection sensitivity of the ultrasonic sensor 4. The specific structure of the ultrasonic sensor 4 includes a corrugated sleeve 401 fixedly connected to the end of the second signal line 2. The corrugated sleeve 401 is made of the same rubber material as the protective layer of the second signal line 2. The corrugated sleeve 401 is fixedly connected to the plug sleeve 403 through a limiting ring 402. The limiting ring 402 is made of corrosion-resistant alloy material and can directly contact the outer wall of the switch cabinet shell or the internal mounting frame. The end of the plug sleeve 403 away from the corrugated sleeve 401 is provided with an ultrasonic detection end 404, and the plug sleeve 403 can be inserted into the cabinet wall of the switch cabinet or the mounting frame inside the cabinet. The ultrasonic detection end 404 directly senses the air vibration and converts the vibration into an electrical signal.

[0032] The first signal line 1 and the second signal line 2 passing through the same cable sheath 508, and the correspondingly connected ground wave partial discharge sensor 3, ultrasonic sensor 4 and processing unit 507 form a group. There are several combinations of the first signal line 1, the second signal line 2, the ground wave partial discharge sensor 3, the ultrasonic sensor 4 and the processing unit 507. Several groups of processing units 507 are arranged equidistantly along the side wall of the shielding shell 501, and can be distributed in multiple positions of the high-voltage switch cabinet to obtain partial discharge signals.

[0033] Working principle: When partial discharge occurs inside the high-voltage switch cabinet, the instantaneous current will break through the air and conduct to the shell of the switch cabinet. In this process, the current will generate electromagnetic waves of several nanoseconds, which will be detected by the extremely sensitive ground wave partial discharge sensor 3. At the same time, the discharge instantly heats the air and generates vibrations, and the excited high-frequency sound waves will also be detected by the ultrasonic sensor 4. By comprehensively evaluating the two physical quantities related to partial discharge, it is possible to determine with a higher probability whether partial discharge has actually occurred in the high-voltage switch cabinet. In addition, the detection component has multiple detection stations, and the time difference of partial discharge signals can be detected by multiple sensors to infer the approximate location of partial discharge in the high-voltage switch cabinet. This function can be achieved through a program similar to navigation and positioning, which is a goal that can be achieved using existing technologies and will not be described in detail here. Therefore, the detection component not only makes it more accurate to judge whether partial discharge has occurred, but also makes it easier to locate the location where partial discharge occurs, making it convenient for staff to inspect and repair.

[0034] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A multi-station partial discharge detection component, characterized in that: The invention comprises a packaging box (5), wherein the packaging box (5) comprises a shielding shell (501), wherein a circuit board is arranged inside the shielding shell (501), wherein the circuit board is electrically connected to a processing unit (507), wherein the processing unit (507) is fixedly connected to a side wall of the shielding shell (501), wherein the processing unit (507) is also electrically connected to a first signal line (1) and a second signal line (2), wherein the end of the first signal line (1) extends outside the shielding shell (501) and is connected to a ground wave partial discharge sensor (3), wherein the ground wave partial discharge sensor (3) is fixedly connected to the outer surface of a shell of a high-voltage switch cabinet, wherein the end of the second signal line (2) extends outside the shielding shell (501) and is connected to an ultrasonic sensor (4), wherein the ultrasonic sensor (4) is arranged inside the high-voltage switch cabinet.

2. The multi-station partial discharge detection assembly according to claim 1, characterized in that: The shielding shell (501) is made of alloy material, and both inner and outer walls are coated with insulating coatings. The circuit board in the shielding shell (501) includes a signal analysis module and a communication module.

3. The multi-station partial discharge detection assembly according to claim 2, characterized in that: The first signal line (1) and the second signal line (2) are connected to the processing unit (507) via the same cable sheath (508).

4. The multi-station partial discharge detection assembly according to claim 3, characterized in that: The first signal line (1) and the second signal line (2) passing through the same cable sheath (508), and the correspondingly connected ground wave partial discharge sensor (3), ultrasonic sensor (4) and processing unit (507) form a group, and there are multiple combinations of the first signal line (1), the second signal line (2), the ground wave partial discharge sensor (3), the ultrasonic sensor (4) and the processing unit (507).

5. The multi-station partial discharge detection assembly according to claim 4, characterized in that: The plurality of processing units (507) are arranged equidistantly along the side wall of the shielding shell (501).

6. The multi-station partial discharge detection assembly according to claim 5, characterized in that: One end face of the shielding shell (501) is provided with a heat dissipation rib (505), and the other end face is fixedly connected to a bonding disk (502), and the end face of the shielding shell (501) is provided with a second connection hole (506) penetrating the bonding disk (502); a cable through hole (503) penetrating the two end faces is provided in the center of the shielding shell (501), and a clearance groove (504) connected to the cable through hole (503) is provided on the end face of the bonding disk (502).

7. The multi-station partial discharge detection assembly according to any one of claims 1 to 6, characterized in that: The ground wave partial discharge sensor (3) comprises a dust cover (301) fixedly connected to the end of the first signal line (1), the dust cover (301) having an open cavity (302), a radio wave detection end (304) fixedly connected to the dust cover (301) in the open cavity (302), and a first connection hole (303) is provided on the dust cover (301).

8. The multi-station partial discharge detection assembly according to claim 7, characterized in that: The ultrasonic sensor (4) comprises a corrugated sleeve (401) fixedly connected to the end of the second signal line (2); the corrugated sleeve (401) is fixedly connected to a plug sleeve (403) via a limit ring (402); and an ultrasonic detection end (404) is provided at the end of the plug sleeve (403) away from the corrugated sleeve (401).

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