Clip-on current detector for finding single-phase earth fault
By setting a limiting device at the jaws of the clamp-on current detector, including a limiting wheel and an electromagnetic drive assembly, the problem of inaccurate measurement caused by incorrect cable positioning is solved, achieving stable cable locking and simplified operation.
Patent Information
- Application Number
- CN202423238840.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2034-12-26
AI Technical Summary
In the process of finding single-phase grounding faults, the incorrect position of the cable leads to inaccurate measurement data and makes the operation difficult. Existing clamp current detectors are difficult to keep the cable stably in the bottom position of the clamp jaws.
A limiting device is installed at the jaws of the clamp current detector, including two limiting wheels and a drive assembly. The limiting wheels are matched with the cable through their structural surfaces, and the limiting wheels are driven by an electromagnet to switch between open and closed positions, ensuring that the cable is stably maintained at the bottom of the jaws.
It achieves stable locking of the cable at the bottom of the clamp, ensuring the accuracy of measurement data, reducing the difficulty of operation, and improving the accuracy and efficiency of single-phase grounding fault location.
Smart Images
Figure CN223711695U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to distribution network fault location technical field especially, it relates to a kind of clamp-on current detector for single-phase grounding fault finding. BACKGROUND
[0002] Single-phase grounding fault is the most common fault of distribution system, it often occurs in humid, rainy weather.Single-phase grounding not only affects the normal power supply of user, but also can produce overvoltage, burn equipment, even cause phase-to-phase short circuit and expand accident.
[0003] In single-phase grounding fault finding method, the fault position can be determined by clamp-on current detector, specifically, clamp-on current detector can be used to detect the fault of cable between two poles, when detecting, cable needs to be placed at the bottom of the clamp-on current detector, see Figure 1 If the position of cable is not correct, it can lead to inaccurate measurement data, see Figure 2 , it is the wrong detection mode when the position of cable is not correct.
[0004] When detecting, insulating rod needs to be connected at the bottom of clamp-on current detector, then operator needs to hold insulating rod, make clamp-on current detector close to cable, and make cable be clamped into the position of Figure 1 , then detection can be carried out. Since operator is standing on the ground, clamp-on current detector is held in the air, so it is difficult to make cable maintain at the position of Figure 1 , so in the process of detection, cable is often located at the position of Figure 2 , leading to inaccurate measurement data. UTILITY MODEL CONTENT
[0005] The utility model provides a clamp-on current detector for single-phase grounding fault finding, when single-phase grounding fault finding is carried out, cable can be maintained at the bottom of the clamp of clamp-on current detector easily, to ensure the accuracy of measurement data.
[0006] To solve the above technical problem, the utility model provides a clamp-on current detector for single-phase grounding fault finding, the clamp-on current detector has clamp, limit device is arranged at the clamp, the limit device is used to make the cable placed in the clamp maintain at the bottom position in the clamp;
[0007] The limit device includes two limit wheels and driving assembly.
[0008] Two said limit wheels are respectively arranged on the left and right sides of the bottom of the jaw; the outer wall of the limit wheel is formed with two structure surfaces, one of which is a full-arc concave surface, and the other is a semi-arc concave surface; the full-arc concave surface matches the outer wall of the cable; the upper part of the semi-arc concave surface is a plane, and the lower part is an arc surface, and the plane of the upper part and the arc surface of the lower part are smoothly transitioned, and the arc surface of the lower part matches the outer wall of the cable;
[0009] The driving assembly is in transmission connection with the two limit wheels, and is used for driving the two limit wheels to switch between the open position and the closed position; when in the open position, the semi-arc concave surfaces of the two limit wheels are distributed on the left and right sides of the center of the bottom of the jaw; when in the closed position, the full-arc concave surfaces of the two limit wheels are distributed on the left and right sides of the center of the bottom of the jaw.
[0010] Further, the two limit wheels are respectively sleeved and fixed on the two rotating shafts, and the top and bottom of the rotating shaft are connected with the shell of the jaw-shaped current detector through a bearing.
[0011] Further, the driving assembly comprises a gear and a rack;
[0012] The number of the gears is two, and the two gears are respectively sleeved and fixed on the lower parts of the two rotating shafts.
[0013] The rack is arranged in cooperation with the gears, and is used for driving the two gears to rotate synchronously.
[0014] Further, the number of the racks is two, and the two racks are respectively engaged with the two gears.
[0015] Further, the driving assembly further comprises a connecting plate, a tension spring, an iron block and an electromagnet;
[0016] The connecting plate is connected between the two racks;
[0017] The tension spring is arranged between the two racks, and one end of the tension spring is fixed with the connecting plate, and the other end is fixed with the inner wall of the shell;
[0018] The iron block is arranged on the side of the connecting plate away from the tension spring;
[0019] The electromagnet is arranged on the side of the iron block away from the tension spring at a predetermined distance.
[0020] Further, the driving assembly further comprises a battery which can supply power to the electromagnet.
[0021] Furthermore, within the jaws, the housing also forms two guide plates, each located above one of the two limiting wheels;
[0022] Each of the two guide plates has an arc-shaped guide surface on one side facing each other; when the two limiting wheels are in the open position, the two arc-shaped guide surfaces are used to guide the cable inserted into the jaws to be inserted into the area between the two semi-arc concave surfaces.
[0023] Furthermore, the upper and lower parts of the full-arc concave surface are symmetrical to each other, and the arc spanned by the full-arc concave surface is between 4π / 6 and 5π / 6.
[0024] The beneficial effects of this utility model are as follows:
[0025] When locating a single-phase ground fault, first place the two limit wheels in the open position and allow the cable to enter between the two limit wheels. Then, switch the two limit wheels to the closed position to lock the position of the cable and keep it stably at the bottom of the clamp. This ensures the accuracy of the measurement data and reduces the difficulty for operators in operating the clamp current detector. Attached Figure Description
[0026] Figure 1 This is a diagram showing the cable positioned at the bottom of the clamp-on current detector's jaws during detection.
[0027] Figure 2 This is a diagram illustrating incorrect detection methods when the cable is misaligned during detection.
[0028] Figure 3 This is a schematic diagram of the clamp-on current detector for locating single-phase grounding faults according to this utility model. In the diagram, the two limiting wheels are in the open position.
[0029] Figure 4 yes Figure 3 The state diagram when the two limit wheels are switched to the closed position;
[0030] Figure 5 yes Figure 3 A sectional view along the AA direction. Detailed Implementation
[0031] The present invention will be further described in detail below with reference to specific embodiments, but the implementation of the present invention is not limited thereto.
[0032] See Figures 3 to 5This utility model provides a clamp current detector for locating single-phase grounding faults. The clamp current detector has a jaw 10a, and two normally closed movable plates 120 are provided on the open side of the jaw 10a. The arrangement of the movable plates 120 is prior art and is consistent with the arrangement in existing clamp current detectors.
[0033] When it is necessary to clamp the cable 300 into the clamp 10a for current detection, the two movable plates 120 are pressed against the cable 300, and then the clamp current detector is pushed forcefully. Due to the compression of the cable 300, the two movable plates 120 will separate to both sides, so that the cable 300 can enter the clamp 10a. After entering, the two movable plates 120 will automatically return to the closed state under the action of the torsion spring.
[0034] The main improvement of this utility model is that a limiting device 200 is provided at the jaw 10a, which is used to keep the cable 300 inserted into the jaw 10a at the bottom position in the jaw 10a.
[0035] The specific structure of the limiting device 200 is described below.
[0036] The limiting device 200 includes two limiting wheels 210 and a drive assembly.
[0037] See Figure 3 The two limiting wheels 210 are respectively arranged on the left and right sides of the bottom position of the jaws 10a. The outer wall of each limiting wheel 210 has two structural surfaces: one is a full-arc concave surface 211, and the other is a semi-arc concave surface 212. (See also...) Figure 3 The full-arc concave surface 211 matches the outer wall of the cable 300; the semi-arc concave surface 212 has a flat upper part and an arc-shaped lower part, and the upper flat surface and the lower arc-shaped lower surface are smoothly transitioned, and the lower arc-shaped lower surface matches the outer wall of the cable 300.
[0038] The drive assembly is connected to the two limiting wheels 210 for driving the two limiting wheels 210 to switch between an open position and a closed position. When in the open position, see [link to relevant documentation]. Figure 3 The semi-circular concave surfaces 212 of the two limiting wheels 210 are distributed facing each other on the left and right sides of the bottom center of the jaws 10a. When in the closed position, see... Figure 4 The two limit wheels 210 have fully arc-shaped concave surfaces 211 facing each other on the left and right sides of the bottom center of the jaws 10a.
[0039] Preferably, see Figure 3The two limiting wheels 210 are respectively sleeved and fixed on the two rotating shafts 220. The top and bottom of the rotating shafts 220 are connected to the housing 100 of the clamp current detector through a bearing 230.
[0040] Preferably, see Figure 3 and Figure 5 The drive assembly includes a gear 240 and a rack 250.
[0041] There are two gears 240, which are respectively fitted and fixed to the lower part of the two rotating shafts 220.
[0042] There are two racks 250, and the two racks 250 mesh with two gears 240 respectively.
[0043] For more details, see Figure 3 and Figure 5 The drive assembly also includes a connecting plate 260, a tension spring 270, an iron block 280, an electromagnet 290, and a battery 2a0.
[0044] The connecting plate 260 is connected between the two racks 250.
[0045] The tension spring 270 is arranged between the two racks 250, and one end of the tension spring 270 is fixed to the connecting plate 260, and the other end is fixed to the inner wall of the housing 100.
[0046] The iron block 280 is arranged on the side of the connecting plate 260 away from the tension spring 270.
[0047] The electromagnets 290 are arranged at predetermined intervals on the side of the iron block 280 away from the tension spring 270.
[0048] The battery 2a0 can supply power to the electromagnet 290.
[0049] Additionally, the drive assembly may also be equipped with a signal receiver (not shown in the figure), a controller (not shown in the figure), and a remote control for remote control. The signal receiver and controller are installed within the housing 100, while the remote control is a separate device. The signal receiver can wirelessly receive signals from the remote control, convert these signals into digital signals, and transmit them to the controller. The controller then controls the electromagnet 290 to be energized or de-energized.
[0050] As can be seen, when in use, the operator can stand on the ground and then use a remote control to control the clamp current detector located high in the air.
[0051] When the electromagnet 290 is energized, the magnetic field generated by the electromagnet 290 attracts the iron block 280 to move. The movement of the iron block 280 drives the two racks 250 to move synchronously through the connecting plate 260. The synchronous movement of the two racks 250 drives the two gears 240 to rotate simultaneously, thereby driving the two limit wheels 210, which are coaxially fixed with the gears 240, to rotate simultaneously. This changes the state of the two limit wheels 210, allowing them to switch between an open position and a closed position.
[0052] When the electromagnet 290 is energized, it attracts the iron block 280 to move a distance that is just enough to make each of the two limit wheels 210 rotate 180°, so that the limit wheels 210 switch from the open position to the closed position.
[0053] Preferably, in order to allow the cable 300 to smoothly engage between the two limiting wheels 210, the present invention also makes the following improvements:
[0054] See Figure 3 In the jaw 10a, the housing 100 also forms two guide plates 110, which are respectively located above the two limiting wheels 210; each of the two guide plates 110 has an arc-shaped guide surface 111 on its opposite side; when the two limiting wheels 210 are in the open position, the two arc-shaped guide surfaces 111 can guide the cable inserted into the jaw 10a to smoothly enter the area between the two semi-arc concave surfaces 212.
[0055] Preferably, in this embodiment, the upper and lower parts of the full-arc concave surface 211 are symmetrical to each other, and the arc spanned by the full-arc concave surface 211 is between 4π / 6 and 5π / 6, that is, the corresponding central angle is between 120° and 150°. This arc ensures that when the two limiting wheels 210 are in the closed position, the two full-arc concave surfaces 211 can lock the cable 300, ensuring that the cable 300 is stably maintained at the bottom position in the jaws 10a (see...). Figure 4 This is to prevent cable 300 from coming out of this position, which could cause inaccurate measurement data.
[0056] In addition, the bottom of the housing 100 is provided with a threaded port 130 for connecting to the insulating rod.
[0057] The specific usage method and working principle of this utility model are as follows:
[0058] Before use, the electromagnet 290 is not energized, and the two limit wheels 210 are in the open position. See below. Figure 3 ;
[0059] In use, connect the threaded port 130 at the bottom of the housing 100 to the insulating rod (not shown in the figure), and then the operator holds the insulating rod so that the two movable pieces 120 at the top of the housing 100 are close to the cable 300.
[0060] Next, let the two movable plates 120 press against the cable 300, and then push the insulating rod upward forcefully so that the cable 300 can pass over the two movable plates 120 and be inserted into the clamp 10a;
[0061] Subsequently, the insulating rod continues to move upward, allowing the cable 300 to enter between the two semi-circular concave surfaces 212 of the two limiting wheels 210 along the guide plate 110. (See below) Figure 3 ;
[0062] Afterwards, the operator operates the remote control on the ground to energize the electromagnet 290. Once energized, the electromagnet 290 attracts the iron block 280. The movement of the iron block 280, via the connecting plate 260, drives the two racks 250 to move, which in turn drives the two gears 240 to rotate. The rotation of the two gears 240 then drives the two limit wheels 210 to rotate, thus allowing the two limit wheels 210 to rotate to the closed position. After the two limit wheels 210 rotate to the closed position, see... Figure 4 At this time, the two fully arc-shaped concave surfaces 211 will wrap and lock the cable 300, so that the cable 300 can be stably maintained at the bottom position in the jaws 10a.
[0063] Then, the detection function of the clamp current detector can be activated to detect the current in cable 300.
[0064] After the detection is completed, the operator can use the remote control to de-energize the electromagnet 290. After de-energization, under the action of the tension spring 270, the connecting plate 260 and the two racks 250 will return to their initial positions. When the two racks 250 return to their initial positions, they will drive the two gears 240 to rotate in the opposite direction, which in turn will drive the two limit wheels 210 to rotate to the open position. See [link / reference]. Figure 3 After the two limit wheels 210 rotate to the open position, the operator only needs to move the insulating rod downwards to allow the cable 300 to leave the clamp 10a. After leaving the clamp, the clamp current detector can be moved to the ground.
[0065] Therefore, when locating single-phase grounding faults, the clamp-on current detector of this invention can stably keep the cable 300 at the bottom of the clamp-on current detector jaws 10a, thereby ensuring the accuracy of the measurement data and reducing the difficulty for operators to operate the clamp-on current detector.
[0066] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A clamp-on current detector for locating single-phase ground faults, characterized in that, The clamp current detector has a jaw (10a), and a limiting device (200) is provided at the jaw (10a). The limiting device (200) is used to keep the cable inserted into the jaw (10a) at the bottom position in the jaw. The limiting device (200) includes two limiting wheels (210) and a drive assembly; Two limiting wheels (210) are respectively arranged on the left and right sides of the bottom position of the jaw (10a); the outer wall of the limiting wheel (210) forms two structural surfaces, one of which is a full arc concave surface (211) and the other is a semi-arc concave surface (212); the full arc concave surface (211) matches the outer wall of the cable; the semi-arc concave surface (212) has a flat upper part and an arc lower part, and the upper flat surface and the lower arc lower surface are smoothly transitioned, and the lower arc lower surface matches the outer wall of the cable; The drive assembly is connected to the two limiting wheels (210) for driving the two limiting wheels (210) to switch between an open position and a closed position; wherein, in the open position, the semi-arc concave surfaces (212) of the two limiting wheels (210) are distributed facing each other on the left and right sides of the bottom center of the jaws (10a); in the closed position, the full arc concave surfaces (211) of the two limiting wheels (210) are distributed facing each other on the left and right sides of the bottom center of the jaws (10a).
2. The clamp-on current detector for single-phase ground fault location according to claim 1, characterized in that, The two limiting wheels (210) are respectively fitted and fixed on the two rotating shafts (220), and the top and bottom of the rotating shafts (220) are connected to the housing (100) of the clamp current detector through a bearing (230).
3. The clamp-on current detector for single-phase ground fault location according to claim 2, characterized in that, The drive assembly includes a gear (240) and a rack (250); The number of gears (240) is two, and the two gears (240) are respectively sleeved and fixed to the lower part of the two rotating shafts (220); The rack (250) is configured in conjunction with the gear (240) to drive the two gears (240) to rotate synchronously.
4. The clamp-on current detector for single-phase ground fault location according to claim 3, characterized in that, There are two racks (250), and the two racks (250) mesh with the two gears (240) respectively.
5. The clamp-on current detector for single-phase ground fault location according to claim 4, characterized in that, The drive assembly also includes a connecting plate (260), a tension spring (270), an iron block (280), and an electromagnet (290). The connecting plate (260) is connected between the two racks (250); The tension spring (270) is arranged between the two racks (250), and one end of the tension spring (270) is fixed to the connecting plate (260), and the other end is fixed to the inner wall of the housing (100); The iron block (280) is arranged on the side of the connecting plate (260) opposite to the tension spring (270); The electromagnets (290) are arranged at predetermined intervals on the side of the iron block (280) away from the tension spring (270).
6. The clamp-on current detector for single-phase ground fault location according to claim 5, characterized in that, The drive assembly also includes a battery (2a0) that can power the electromagnet (290).
7. The clamp-on current detector for single-phase ground fault location according to any one of claims 2 to 6, characterized in that, In the jaws (10a), the housing (100) also forms two guide plates (110), which are respectively located above the two limiting wheels (210); Each of the two guide plates (110) has an arc-shaped guide surface (111) on one side facing each other; when the two limiting wheels (210) are in the open position, the two arc-shaped guide surfaces (111) are used to guide the cable inserted into the jaws (10a) to be inserted into the area between the two semi-arc concave surfaces (212).
8. The clamp-on current detector for single-phase ground fault location according to any one of claims 1 to 6, characterized in that, The upper and lower parts of the full-arc concave surface (211) are symmetrical to each other, and the arc spanned by the full-arc concave surface (211) is between 4π / 6 and 5π / 6.