Electric leakage monitoring equipment for switch cabinet
By combining a monitoring frame and a partial discharge detector on the switchgear, continuous monitoring of the switchgear is achieved, solving the problem that periodic inspections cannot be conducted in real time, and improving the safety and accuracy of the inspection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUNAN HUADIAN RONGSHENG TONGSHI ELECTRIC TECH CO LTD
- Filing Date
- 2025-05-29
- Publication Date
- 2026-05-19
AI Technical Summary
In existing technologies, switchgear testing can only be performed periodically, and real-time monitoring is not possible, which can easily lead to the problem of missing leakage discharge detection.
Design a leakage current monitoring device for switchgear. The device uses a monitoring frame suspended along the outer perimeter of the switchgear's length, width, and height. Equipped with a partial discharge detector, the device moves along the circumferential and vertical directions of the frame to continuously perform signal and ultrasonic detection, record abnormal signals, and notify professional testing personnel for further inspection.
It enables continuous and uninterrupted monitoring of the switchgear, reduces the chance of missing leakage discharge detection, and improves the safety and accuracy of detection.
Smart Images
Figure CN224263371U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power equipment technology, and in particular to a leakage current monitoring device for switchgear. Background Technology
[0002] Switchgear is an important component of power systems, used to open, close, control, and protect electrical equipment during power generation, transmission, distribution, and energy conversion. Switchgear typically includes a gas chamber, an operating room, a cable compartment, and a low-voltage compartment.
[0003] During normal operation, switchgear is subject to various discharge phenomena due to environmental factors such as temperature, humidity, dust, and overvoltage. These include corona discharge, surface discharge, floating discharge, and air gap discharge. Conventional testing involves professional personnel using handheld partial discharge detectors to perform signal and ultrasonic testing at different locations within the switchgear. The results are then analyzed to determine the specific partial discharge at each location. Manual testing, however, can only be performed periodically and cannot provide real-time monitoring, making it prone to omissions in detection. Utility Model Content
[0004] (a) Technical problems to be solved
[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, this utility model provides a leakage current monitoring device for switch cabinets, which solves the technical problem that manual operation can only perform periodic inspections and cannot perform real-time monitoring of switch cabinets, which is prone to detection omissions.
[0006] (II) Technical Solution
[0007] To achieve the above objectives, the main technical solutions adopted by this utility model include:
[0008] This utility model embodiment provides a leakage current monitoring device for switchgear, including a monitoring frame suspended along the outer periphery of the switchgear along its length, width, and height, and a partial discharge detector mounted on the monitoring frame. The monitoring frame includes a lower frame fitted onto the lower end of the switchgear, an upper frame fitted onto the upper end of the switchgear and arranged in a horizontal circular shape, and multiple support rods vertically connected to the upper frame and the lower frame. The partial discharge detector is slidably arranged on both the upper frame and the lower frame along their own circumference, and the partial discharge detector is vertically slidably arranged on the inner side of the support rods.
[0009] This utility model provides a leakage current monitoring device for switchgear. When monitoring leakage discharge in the switchgear using this device, a partial discharge detector moves circumferentially along the upper and lower frames, continuously performing signal and ultrasonic detection on the switchgear while moving. Simultaneously, the partial discharge detector slides vertically along the inner side of the support rod, thereby detecting the side of the switchgear. The three sets of partial discharge detectors work continuously. If an abnormal high-frequency signal or abnormal ultrasonic signal is detected, it can be recorded and awaited for the next detection. If the signal is still abnormal in the second detection, a professional inspection can be notified. This solution can provide continuous and uninterrupted monitoring of the switchgear, reducing the probability of missed leakage discharge detection and making it safer.
[0010] Optionally, the support rod is arc-shaped and protrudes outward to the side away from the switch cabinet. The upper frame is slidably provided with a movable seat along its own length direction. The movable seat is provided with a cable reel that lifts the partial discharge detector in the vertical direction.
[0011] By sliding a movable base on the upper frame, the movable base can drive the partial discharge detector to move circumferentially. At the same time, a cable retractor is installed on the movable base, which can drive the partial discharge detector to move up and down in the vertical direction. This means that the original three sets of partial discharge detectors can now be used to monitor the top, bottom and sides of the switch cabinet with a single partial discharge detector, which is more convenient.
[0012] Optionally, two cable retractors are provided and spaced apart along the diameter of the upper frame. The cables on the two cable retractors are simultaneously connected to the partial discharge detector and the detection end of the partial discharge detector is kept horizontally facing the switch cabinet.
[0013] By setting two cable retractors and distributing them at intervals towards the switch cabinet, the detection end of the partial discharge detector can continuously face the switch cabinet when the moving base moves circumferentially along the upper frame, thus providing more accurate and stable monitoring results.
[0014] Optionally, the upper end of the support rod extends to the upper side of the upper frame and bends downward to connect to the upper end of the upper frame. A toothed ring is coaxially provided at the lower end of the upper frame. A sliding arm is bent upward at the top of the movable seat. The two sliding arms and the top of the movable seat form a sliding groove for the upper frame to be embedded in. The movable seat is clamped to the lower end of the upper frame by the two sliding arms. A gear driven by a motor and meshing with the toothed ring is rotatably provided on the movable seat.
[0015] By extending the upper end of the support rod to the upper side of the upper frame and bending it to connect to the upper end of the upper frame, the rest of the upper frame is unobstructed, which makes it easier for the two sliding arms on the moving base to be clamped on the upper frame. Then, through the meshing of the rotating gear with the gear ring, the entire moving base can move at a uniform speed on the upper frame, which is more convenient.
[0016] Optionally, the upper frame has guide grooves coaxially formed on both sides at the upper end, and the sliding arm has balls partially embedded in the guide grooves and rolling along the length of the guide grooves.
[0017] By opening two annular guide grooves on the upper side of the upper frame, the rolling balls embedded in the sliding arm can be partially embedded in the guide grooves and roll, thereby reducing the friction between the sliding arm and the upper frame, making the movement of the moving seat easier and more convenient.
[0018] Optionally, two movable seats are provided on the upper frame, and the connecting line of the two movable seats passes through the center of the upper frame. The cable rewinder and the partial discharge detector are respectively provided on the two movable seats.
[0019] By setting up two partial discharge detectors and controlling their movement and lifting via two separate movable bases, the two detectors can serve as backups for each other, preventing monitoring failure due to the malfunction of one detector. Furthermore, the two detectors can work synchronously, reducing the time required for each detection step, thereby increasing the detection interval and improving the monitoring effect.
[0020] Optionally, the lower end of the movable seat is horizontally provided with a slide rail facing the center of the upper frame, and the lower end of the slide rail is horizontally slidably provided with a slide rod along its own length direction, and the cable rewinder is fixed to the lower end of the slide rod.
[0021] By horizontally installing a slide at the lower end of the movable base, the slide bar can slide horizontally towards the center of the upper frame, thereby driving the cable rewinder and the partial discharge detector to move together. This allows the partial discharge detector to be closer to the surface of the switch cabinet when testing it, and at the same time, to make the detection point approximately the same distance from the switch cabinet surface, so as to obtain more accurate monitoring results.
[0022] Optionally, the lower end of the slide rail is provided with a "T"-shaped groove, the upper end of the slide rod is provided with a "T"-shaped slider that slides into the "T"-shaped groove, and the end of the slide rail away from the switch cabinet is provided with an electric push rod, one end of the electric push rod is connected to the "T"-shaped slider and pushes the "T"-shaped slider to slide.
[0023] By using an electric push rod to push the slide bar, the movement stroke and accuracy of the slide bar are more controllable.
[0024] Optionally, the lower frame and the multiple support rods, as well as the multiple support rods and the upper frame, can be detachably connected.
[0025] By detachably connecting the lower frame and support rods, as well as the upper frame and support rods, the entire monitoring equipment can be assembled and disassembled, making it more convenient.
[0026] (III) Beneficial Effects
[0027] The beneficial effects of this utility model are as follows: When monitoring leakage discharge in a switchgear, the partial discharge detector moves circumferentially along the upper and lower frames, continuously performing signal and ultrasonic detection on the switchgear. Simultaneously, the partial discharge detector slides vertically along the inner side of the support rod, thus detecting the side of the switchgear. All three sets of partial discharge detectors operate continuously. If an abnormal high-frequency signal or abnormal ultrasonic signal is detected, it can be recorded and awaited for the next detection. If the signal is still abnormal in the second detection, a professional inspector can be notified for further testing. This solution allows for continuous and uninterrupted monitoring of the switchgear, reducing the chance of missed leakage discharge detection and enhancing safety. Attached Figure Description
[0028] Figure 1 This is a perspective view of an embodiment of the present utility model;
[0029] Figure 2 for Figure 1 Enlarged view of point A.
[0030] [Explanation of Labels in the Attached Image]
[0031] 1. Monitoring frame; 11. Lower frame; 12. Upper frame; 121. Gear ring; 122. Guide groove; 13. Support rod; 2. Partial discharge detector; 3. Moving seat; 31. Sliding arm; 32. Sliding groove; 33. Gear; 34. Ball bearing; 35. Carriage; 351. "T" shaped slide groove; 36. Slide rod; 361. "T" shaped slider; 37. Electric push rod; 4. Cable rewinder. Detailed Implementation
[0032] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0033] The leakage current monitoring device for switchgear proposed in this embodiment of the invention monitors leakage discharge in the switchgear. During this monitoring, a partial discharge detector moves circumferentially along the upper and lower frames, continuously performing signal and ultrasonic detection on the switchgear. Simultaneously, the partial discharge detector slides vertically along the inner side of the support rod, detecting the side of the switchgear. All three sets of partial discharge detectors operate continuously. If an abnormal high-frequency signal or abnormal ultrasonic signal is detected, it is recorded and awaits the next detection. If the signal is still abnormal in the second detection, a professional inspector can be notified for further testing. This solution provides continuous and uninterrupted monitoring of the switchgear, reducing the chance of missed leakage discharge detection and enhancing safety.
[0034] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.
[0035] Reference Figure 1 and Figure 2 A leakage current monitoring device for switchgear includes a monitoring frame 1 suspended along the outer periphery of the switchgear in the air along its length, width, and height, and a partial discharge detector 2 mounted on the monitoring frame 1.
[0036] The monitoring frame 1 includes a lower frame 11 fitted onto the lower end of the switchgear, an upper frame 12 fitted onto the upper end of the switchgear in a horizontal circular shape, and multiple support rods 13 vertically connecting the upper frame 12 and the lower frame 11. Partial discharge detectors 2 are slidably arranged along the circumference of both the upper frame 12 and the lower frame 11, and vertically slidably arranged inside the support rods 13. The partial discharge detectors 2 continuously move and operate. If an abnormal high-frequency signal or an abnormal ultrasonic signal is detected, it can be recorded and awaited for the next detection. If the signal is still abnormal in the second detection, a professional inspection technician can be notified to conduct an inspection. By continuously monitoring the switchgear, the probability of missed leakage discharge detection is reduced, thus enhancing safety.
[0037] The lower frame 11 and multiple support rods 13, as well as the multiple support rods 13 and the upper frame 12, are all detachably connected by bolts. This makes the entire monitoring equipment easier to assemble and disassemble.
[0038] The support rod 13 is arc-shaped and protrudes outwards to the side away from the switchgear. The upper frame 12 has a movable base 3 that slides along its length. A cable reel 4 that lifts the partial discharge detector 2 vertically is installed under the movable base 3. The movable base 3 can move the partial discharge detector 2 circumferentially. At the same time, the cable reel 4 on the movable base 3 can move the partial discharge detector 2 vertically. This means that the original three sets of partial discharge detectors 2 can now be used to monitor the top, bottom and sides of the switchgear with a single partial discharge detector 2, which is more convenient.
[0039] The upper end of the support rod 13 extends to the upper side of the upper frame 12 and bends downward to connect to the upper end of the upper frame 12. A toothed ring 121 is coaxially provided at the lower end of the upper frame 12. A sliding arm 31 is bent upward at the top of the movable seat 3. The two sliding arms 31 and the top of the movable seat 3 form a sliding groove 32 for the upper frame 12 to be embedded. The movable seat 3 is clamped to the lower end of the upper frame 12 by the two sliding arms 31. A gear 33 driven by a motor and meshing with the toothed ring 121 is rotatably provided on the movable seat 3. A guide groove 122 is coaxially opened at the upper end of the upper frame 12 near both sides. Roller balls 34, which are partially embedded in the guide groove 122 and roll along the length of the guide groove 122, are rolled on the sliding arms 31. The upper end of the support rod 13 extends to the upper side of the upper frame 12 and is bent and connected to the upper end of the upper frame 12, so that the rest of the upper frame 12 is unobstructed. This makes it easy for the two sliding arms 31 on the movable seat 3 to be clamped on the upper frame 12. Then, through the rotating gear 33 meshing with the gear ring 121, the entire movable seat 3 can move at a constant speed on the upper frame 12. With the help of the ball bearing 34 and the guide groove 122, the movement of the movable seat 3 is more convenient and faster.
[0040] Two movable seats 3 are provided on the upper frame 12. The connecting wire between the two movable seats 3 passes through the center of the upper frame 12. A cable retractor 4 and a partial discharge detector 2 are respectively installed on the two movable seats 3. By setting two partial discharge detectors 2 and controlling their movement and lifting through the two movable seats 3 respectively, the two partial discharge detectors 2 can serve as backups for each other, avoiding monitoring failure due to the failure of one partial discharge detector 2. On the other hand, the two partial discharge detectors 2 can work synchronously to detect, reducing the time of one detection process, thereby speeding up the detection interval and improving the monitoring effect.
[0041] A slide 35 is horizontally mounted at the lower end of the movable base 3, facing the center of the upper frame 12. A slide rod 36 is horizontally mounted on the lower end of the slide 35 along its length. A "T"-shaped groove 351 is formed on the lower end of the slide 35. A "T"-shaped slider 361 is mounted on the upper end of the slide rod 36, which slides into the "T"-shaped groove 351. An electric push rod 37 is mounted on the end of the slide 35 away from the switch cabinet. One end of the electric push rod 37 is connected to the "T"-shaped slider 361 and pushes the "T"-shaped slider 361 to slide. Two cable retractors 4 are fixed at intervals on the lower end of the slide rod 36. The cables on the two cable retractors 4 are simultaneously connected to the partial discharge detector 2, keeping the detection end of the partial discharge detector 2 continuously horizontally facing the switch cabinet. This allows the detection end of the partial discharge detector 2 to continuously face the switch cabinet when the movable base 3 moves circumferentially. In conjunction with the slide rod 36, it can slide horizontally towards the center of the upper frame 12, thereby driving the cable reel 4 and the partial discharge detector 2 to move together. This allows the partial discharge detector 2 to be closer to the surface of the switch cabinet when testing it, while also ensuring that the detection points at different locations are approximately the same distance from the switch cabinet surface, thus providing more accurate and stable monitoring results.
[0042] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.
[0044] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0045] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0046] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.
Claims
1. A leakage current monitoring device for switchgear, characterized in that: The system includes a monitoring frame (1) suspended along the outer periphery of the switch cabinet along its length, width, and height, and a partial discharge detector (2) mounted on the monitoring frame (1). The monitoring frame (1) includes a lower frame (11) fitted onto the lower end of the switch cabinet, an upper frame (12) fitted onto the upper end of the switch cabinet and arranged in a horizontal ring shape, and multiple support rods (13) vertically connected to the upper frame (12) and the lower frame (11). The partial discharge detector (2) is slidably arranged on both the upper frame (12) and the lower frame (11) along their own circumference, and the partial discharge detector (2) is vertically slidably arranged on the inner side of the support rods (13).
2. The leakage current monitoring device for switchgear as described in claim 1, characterized in that: The support rod (13) is arc-shaped and protrudes outward to the side away from the switch cabinet. The upper frame (12) is provided with a movable seat (3) that slides along its own length. The movable seat (3) is provided with a cable reel (4) that lifts the partial discharge detector (2) in the vertical direction.
3. The leakage current monitoring device for switchgear as described in claim 2, characterized in that: Two cable retractors (4) are provided and are spaced apart along the diameter of the upper frame (12). The cables on the two cable retractors (4) are simultaneously connected to the partial discharge detector (2) and the detection end of the partial discharge detector (2) is kept horizontally facing the switch cabinet.
4. The leakage current monitoring device for switchgear as described in claim 2, characterized in that: The upper end of the support rod (13) extends to the upper side of the upper frame (12) and bends downward to connect to the upper end of the upper frame (12). A toothed ring (121) is coaxially provided on the lower end of the upper frame (12). A sliding arm (31) is bent upward on the top of the movable seat (3). The two sliding arms (31) and the top of the movable seat (3) form a sliding groove (32) for the upper frame (12) to be embedded. The movable seat (3) is clamped to the lower end of the upper frame (12) by the two sliding arms (31). A gear (33) driven by a motor and meshing with the toothed ring (121) is rotatably provided on the movable seat (3).
5. The leakage current monitoring device for switchgear as described in claim 4, characterized in that: The upper frame (12) has guide grooves (122) coaxially opened on the upper side near both sides. The sliding arm (31) has balls (34) that are partially embedded in the guide grooves (122) and roll along the length of the guide grooves (122).
6. The leakage current monitoring device for switchgear as described in claim 2, characterized in that: Two movable seats (3) are provided on the upper frame (12). The connecting line of the two movable seats (3) passes through the center of the upper frame (12). The cable rewinder (4) and the partial discharge detector (2) are respectively provided on the two movable seats (3).
7. The leakage current monitoring device for switchgear as described in claim 2, characterized in that: The lower end of the movable seat (3) is horizontally provided with a slide (35) facing the center of the upper frame (12). The lower end of the slide (35) is horizontally provided with a slide rod (36) along its own length direction. The cable reel (4) is fixed to the lower end of the slide rod (36).
8. The leakage current monitoring device for switchgear as described in claim 7, characterized in that: The lower end of the slide (35) is provided with a "T"-shaped groove (351), and the upper end of the slide rod (36) is provided with a "T"-shaped slider (361) that slides into the "T"-shaped groove (351). The end of the slide (35) away from the switch cabinet is provided with an electric push rod (37), one end of which is connected to the "T"-shaped slider (361) and pushes the "T"-shaped slider (361) to slide.
9. The leakage current monitoring device for switchgear as described in claim 1, characterized in that: The lower frame (11) and the multiple support rods (13), as well as the multiple support rods (13) and the upper frame (12), are all detachably connected.