A portable fuse tripping detection device suitable for ring network cabinet

Abstract

The present invention provides a portable fuse trip detection device suitable for a ring network cabinet, comprising a simulated fuse, an insulating cylinder end cover and an insulating operation box; an AC / DC trip coil is fixedly installed in the simulated fuse; the insulating cylinder end cover comprises an end cover slot and a sealing end cover, the end cover slot is used to be installed on the insulating cylinder of the ring network cabinet, and a trip pin that can move forward and backward is arranged in the sealing end cover, one end of the trip pin passes through the front end of the sealing end cover, and the other end abuts against the trip coil of the simulated fuse. A rotatable baffle is arranged between the end cover slot and the sealing end cover, and when the trip detection device is installed on the insulating cylinder, the upper end of the baffle is close to the trip pin, and the lower end is close to the trip interlock to be tested. The detection device also includes an extension component for adjusting the size. The present invention is suitable for 12 / 24kV gas insulated ring network cabinet combined electrical cabinet type, small in size, easy to carry, using a variety of operating voltage inputs, simple to operate, and has high safety and reliability.

Description

Technical Field

[0001] The invention relates to a fuse tripping detection device suitable for a gas-insulated ring main unit, and belongs to the field of ring main unit detection devices. Background Art

[0002] After the power of urban and rural power grids is transformed from high-voltage primary power to 24 / 12kV, a large number of regional secondary substations are required to distribute the power to user terminals. The safety and reliability of distribution equipment directly affect the stability of the distribution network. Ring main unit has been widely used in urban residential areas, high-rise buildings, small and medium-sized enterprises, large public buildings, switchgear, and box-type substations due to its advantages of small size, low cost, small footprint, and performance that meets the basic requirements of secondary power distribution. The continuous advancement of the distribution network has put forward higher requirements for the safety of distribution equipment. The combination electrical cabinet is an important cabinet type in the ring main unit distribution system, and the fuse tripping function directly affects the safety and reliability of the product. In this context, in order to ensure the quality of the product, it is necessary to equip it with various rigorous detection devices. The existing ring main unit fuse tripping detection devices mostly use temporary devices, which have low reliability, poor safety, inconvenience in carrying, and insufficient operational flexibility. Summary of the invention

[0003] The purpose of the present invention is to provide a portable fuse tripping detection device suitable for a ring main unit, which is suitable for a 12 / 24kV gas insulated ring main unit combined electrical cabinet type, so as to solve the defects that the current fuse tripping detection devices mostly adopt temporary devices, have low reliability, poor safety, are inconvenient to carry and lack operational flexibility.

[0004] To achieve the above object, the present invention provides a portable fuse tripping detection device suitable for a ring main unit, comprising a simulated fuse, an insulating cylinder end cover and an insulating operation box.

[0005] A tripping coil is provided in the simulated fuse, and the tripping coil is electrically connected to the insulating operation box;

[0006] The insulating cylinder end cover comprises an end cover card slot, a baffle, a tripping ejector pin and a sealing end cover, and the sealing end cover is detachably fastened together with the simulated fuse; the end cover card slot is fixed on the sealing end cover and can be rotatably clamped on the insulating cylinder of the ring network cabinet; the tripping ejector pin is arranged in the sealing end cover along the central axis direction of the sealing end cover and can move forward and backward along the central axis direction, one end of the tripping ejector pin passes through the front end wall of the sealing end cover, and the other end abuts against the tripping coil; the baffle can be rotatably arranged between the insulating cylinder end cover and the sealing end cover, and when the tripping detection device is installed on the insulating cylinder, the upper end of the baffle is close to the tripping ejector pin, and the lower end is close to the tripping interlock to be tested;

[0007] The insulated operating box is used to apply operating current to the trip coil at various operating voltages.

[0008] Furthermore, the insulating cylinder is provided with two radially symmetrical clips, and the end cover clip slot is provided with two centrally symmetrical clip grooves which are respectively rotatably clipped with each clip, and the clip groove is provided with a closed end and an open end, the open end allows the clip to slide into the clip groove, and the closed end is used to lock the clip in the clip groove.

[0009] Furthermore, the other end of the tripping ejector is provided with a limiting portion for limiting the moving distance of the tripping ejector.

[0010] Furthermore, two bayonet holes are arranged at the lower front end of the sealing end cover, and lugs corresponding to the bayonet holes are arranged at both sides of the middle part of the baffle respectively, and the two lugs are rotatably engaged in the corresponding bayonet holes respectively.

[0011] Furthermore, a stopper is provided on one of the two bayonet holes, and the stopper is located in front of the blocking piece.

[0012] Furthermore, the sealing end cover and the simulated fuse are fastened together by a first claw clamp and a first throat hoop.

[0013] Furthermore, the end sealing cover slot is detachably fixed on the sealing end cover.

[0014] Furthermore, the portable fuse tripping detection device also includes an extension component, and the extension component is detachably fastened to the simulated fuse.

[0015] Furthermore, the extension assembly and the simulated fuse are fastened together by a second claw clamp and a second throat clamp.

[0016] Beneficial effects achieved by the present invention: The portable fuse tripping detection device designed by the present invention is suitable for 12 / 24kV gas-insulated ring main unit combined electrical cabinet type, has a small size, is easy to carry, and is suitable for factory production detection and on-site debugging. The detection device adopts a variety of operating voltage inputs, is simple to operate, and has high safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of a portable fuse tripping detection device according to an embodiment of the present invention;

[0018] Figure 2 for Figure 1 The structural diagram of the insulating barrel end cover shown;

[0019] Figure 3 for Figure 2 Another structural diagram of the insulating tube end cover shown, wherein the structure of the baffle is shown;

[0020] Figure 4 for Figure 1 The structural diagram of the simulated fuse shown;

[0021] Figure 5 for Figure 1 A structural diagram of the extension assembly shown;

[0022] Figure 6 A longitudinal cross-sectional view of a portable fuse tripping detection device according to an embodiment of the present invention;

[0023] Figure 7 for Figure 1 The structural diagram of the insulating operation box shown;

[0024] Figure 8 It is a schematic diagram of a portable fuse tripping detection device in accordance with an embodiment of the present invention in conjunction with a spring operating mechanism.

[0025] The meanings of the symbols in the attached drawings are as follows: 1-three-phase plug; 2-insulating cylinder end cover; 3-simulated fuse; 4-extension assembly; 5-insulating operation box; 6-spring operating mechanism; 7-tripping interlock to be tested; 8-insulating cylinder; 21-end cover card slot; 22-blocking piece; 23-tripping ejector pin; 24-sealing end cover; 25-first throat clamp; 26-first claw clamp; 31-simulated fuse front cover; 32-tripping coil mounting plate; 33-tripping coil; 34-simulated fuse housing; 35-simulated fuse tail cover; 41-second throat clamp; 42-second claw clamp; 43-extension rod; 44-terminal; 51-digital display screen; 52-conversion switch; 53-operation button; 54-short-circuit trip protection switch; 211 snap-in groove; 221 lug; 231 limiting part; 241 bayonet; 242 stopper; 243 accommodating chamber one; 244 partition plate; 245 accommodating chamber two; 246 limiting member. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with specific examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention.

[0027] like Figures 1 to 6 As shown in the figure, a portable fuse tripping detection device suitable for a ring main unit provided by an embodiment of the present invention comprises an insulating cylinder end cover 2, a simulated fuse 3 and an insulating operation box 5.

[0028] Insulation tube end cap 2, such as Figure 2 As shown, it includes an end sealing cover slot 21, a blocking piece 22, a release ejector pin 23, a sealing end cover 24, a first throat clamp 25 and a first claw clamp 26.

[0029] The end cover slot 21 is detachably fixed to the sealing end cover 24; preferably, the end cover slot 21 is connected to the sealing end cover 24 to facilitate the disassembly, assembly and replacement of the end cover slot 21. The end cover slot 21 can be rotatably connected to the insulating cylinder 8 (such as Figure 8 As shown), the tripping detection device is installed in the insulating cylinder 8. Specifically, the insulating cylinder 8 is provided with two radially symmetrical clips, and the end cover clip slot 21 is provided with two centrally symmetrical clipping grooves 211 which are respectively rotatably clipped with each clip, and the clipping groove 211 is provided with a closed end and an open end, and the open end allows the clip to slide into the clipping groove 211, and the closed end is used to lock the clip in the clipping groove 211. When the end cover clip slot 21 is installed on the insulating cylinder 8, the two clips slide into the clipping groove 211 from the corresponding open ends respectively, and then the end cover clip slot 21 is rotated to make the clip slide into the closed end, thereby realizing the fixed connection between the end cover clip slot 21 and the insulating cylinder 8. During disassembly, it is only necessary to rotate the end cover clip slot 21 in the opposite direction, and then make the clip slide out from the open end. In a preferred embodiment, as Figure 2 As shown, the clamping slot 211 is configured to be arc-shaped. In other embodiments, the clamping slot 211 may also be configured to be a right angle or other shapes.

[0030] The release pin 23 is disposed in the sealing end cover 24 along the central axis direction of the sealing end cover 24 and can move forward and backward along the central axis direction. Figure 6 As shown, a partition plate 244 is provided inside the sealing end cover 24, and the partition plate 244 divides the inside of the sealing end cover 24 into a first accommodating chamber 243 and a second accommodating chamber 245. A circular hole is provided at the center of the partition plate 244 to allow the release pin 23 to pass through. A limiting member 246 is installed in the accommodating chamber 1 243. The limiting member 246 leaves a passage along the central axis direction to allow the release pin 23 to pass through, and the diameter of the passage is slightly larger than the diameter of the release pin 23. The release pin 23 can also be installed by other existing technologies, as long as it can move forward and backward along the central axis direction of the sealing end cover 24. A circular hole is also provided on the front end wall of the sealing end cover 24 to allow the release pin 23 to pass through freely. One end of the release pin 23 passes through the central circular hole of the partition plate 244 and the central channel of the limiting member 246 and then passes through the circular hole.

[0031] The baffle 22 is rotatably disposed between the end cover slot 21 and the sealing end cover 24. Figure 3 As shown, two bayonet holes 241 are provided at the lower front end of the sealing end cover 24, and lugs 221 corresponding to the bayonet holes 241 are provided on both sides of the middle of the baffle 22, respectively. The two lugs 221 are rotatably engaged in the corresponding bayonet holes 241. With this structural arrangement, the baffle 22 can rotate forward and backward relative to the bayonet holes 241. When the trip detection device is installed on the insulating cylinder 8, the upper end of the baffle 22 is close to the trip pin 23, and the lower end is close to the trip interlock 7 to be tested, as shown in FIG. Figure 6 shown.

[0032] In a preferred embodiment, if Figure 3 As shown, a stopper 242 is provided in front of the baffle 22 , and the stopper 242 is fixedly connected to one of the two bayonet holes 241 to limit the rotation range of the baffle 22 and prevent the baffle 22 from rotating too much.

[0033] The first throat hoop 25 and the first claw 26 are arranged at the rear end of the sealing end cover 24. The first claw 26 is used to position the sealing end cover 24 and the simulated fuse 3, and the first throat hoop 25 is used to fasten the sealing end cover 24 and the simulated fuse 3 together.

[0034] The simulated fuse 3 is suitable for a combined electrical appliance ring main unit and comprises a simulated fuse front cover 31 , a trip coil mounting plate 32 , a trip coil 33 , a simulated fuse housing 34 and a simulated fuse tail cover 35 .

[0035] The sealing end cover 24 is fixed on the simulated fuse front cover 31 through the first throat hoop 25 and the first claw clamp 26. Figure 6 The simulated fuse front cover 31 is provided with a circular hole allowing the trip coil 33 to pass through, as shown in FIG. Figure 4 As shown, the trip coil 33 can move forward and backward through the circular hole.

[0036] The tripping coil mounting plate 32 is arranged in the simulated fuse housing 34, and the tripping coil 33 is fixedly mounted on the tripping coil mounting plate 32. The tripping coil 33 is an AC / DC tripping coil. The tripping coil 33 abuts against the other end of the tripping pin 23. Two wiring terminals are also arranged at the tail end of the tripping coil 33.

[0037] In a preferred embodiment, a limiting portion 231 is provided at the other end of the tripping ejector pin 23. Figure 6 As shown, the limiting portion 231 is located in the second accommodating cavity 245 , and the limiting portion 231 can limit the forward and backward movement distance of the tripping ejector 23 to prevent the tripping ejector 23 from moving too far and even escaping from the sealing end cover 24 .

[0038] like Figure 1 As shown, the insulating operation box 5 is connected to the three-phase plug 1. In addition, the insulating operation box 5 is electrically connected to the two wiring terminals of the tripping coil 33 through a line. Figure 7 As shown, there are electrical components such as a short circuit trip protection switch 54, an operation button 53, a conversion switch 52, and a digital display screen 51, which are operated by the inspector. Among them, the conversion switch 52 can select different input voltages, and the digital display screen 51 can display the current input voltage.

[0039] In a preferred embodiment, if Figure 1As shown, the portable fuse tripping detection device also includes an extension component 4. The extension component 4 is detachably fixed to the simulated fuse 3 and is used to adjust the size of the detection device to be suitable for insulating cylinders 8 of different voltage specifications (12 kV or 24 kV). The extension component 4 includes a second throat clamp 41, a second claw clamp 42, an extension rod 43 and a terminal 44, as shown in FIG. Figure 5 shown.

[0040] The extension component 4 is assembled and fixed on the simulated fuse tail cover 35. The extension component 4 and the simulated fuse tail cover 35 are locked together by the second throat clamp 41 and the second claw clamp 42. In a preferred embodiment, the length of the extension rod 43 is adjustable.

[0041] The portable fuse tripping detection device of the embodiment of the present invention has the following specific working process:

[0042] (1) Installation: Refer to Figure 8 , slowly put the portable fuse trip detection device into the insulating cylinder 8, and detect it in sequence according to the ABC phase sequence. If the insulating cylinder 8 is of 24kV voltage level, loosen the second throat clamp 41 and install the extension component 4 on the simulated fuse tail cover 35 to adjust the size of the trip detection device; when the buckle on the insulating cylinder 8 slides into the open end of the clamping groove 211 of the end cover clamping groove 21, rotate the insulating cylinder end cover 2 clockwise, and when the buckle slides to the closed end of the clamping groove 211, it means that the detection device is installed; insert the three-phase plug 1 into the power supply, adjust the conversion switch 52 on the operation box 5 to the corresponding gear, turn on the short-circuit trip protection switch 54, verify whether the current input voltage displayed on the digital display screen 51 is consistent with the voltage of the corresponding gear, press the operation button 53, the trip coil 33 is actuated, driving the trip pin 23 to move forward, and the trip pin 23 pushes the baffle 22 to rotate; at this time, the baffle 22 will push the fuse to be tested trip interlock 7, if the interlocking action is reliable, the spring operating mechanism 6 will open.

[0043] (2) After the A phase test is completed, disconnect the power supply, rotate the insulation cylinder end seal counterclockwise, 2, take out the trip detection device, and put it into the B and C phase insulation cylinders 8 in turn, and repeat the test steps in (1) above. Only after the three phases are tested can it be determined that the trip interlock 7 of the combination electrical ring network cabinet to be tested is reliable.

[0044] The present invention has been disclosed above with preferred embodiments, but they are not intended to limit the present invention. Any technical solutions obtained by adopting equivalent replacement or equivalent transformation solutions fall within the protection scope of the present invention.

Claims

1. A portable fuse tripping detection device suitable for ring main unit, characterized in that: It includes a simulated fuse, an insulating barrel end cover and an insulating operating box. A tripping coil is provided in the simulated fuse, and the tripping coil is electrically connected to the insulating operation box; The insulating cylinder end cover comprises an end cover card slot, a baffle, a tripping ejector pin and a sealing end cover, and the sealing end cover is detachably fastened together with the simulated fuse; the end cover card slot is fixed on the sealing end cover and can be rotatably clamped on the insulating cylinder of the ring network cabinet; the tripping ejector pin is arranged in the sealing end cover along the central axis direction of the sealing end cover and can move forward and backward along the central axis direction, one end of the tripping ejector pin passes through the front end wall of the sealing end cover, and the other end abuts against the tripping coil; the baffle can be rotatably arranged between the insulating cylinder end cover and the sealing end cover, and when the tripping detection device is installed on the insulating cylinder, the upper end of the baffle is close to the tripping ejector pin, and the lower end is close to the tripping interlock to be tested; The insulated operating box is used to apply operating current to the trip coil at various operating voltages.

2. The portable fuse tripping detection device suitable for ring main unit according to claim 1, characterized in that: The insulating cylinder is provided with two radially symmetrical clips, and the end cover clip slot is provided with two centrally symmetrical clip grooves which are respectively rotatably clipped with each clip, and the clip groove is provided with a closed end and an open end, the open end allows the clip to slide into the clip groove, and the closed end is used to lock the clip in the clip groove.

3. The portable fuse tripping detection device suitable for ring main unit according to claim 1, characterized in that: The other end of the release ejector pin is provided with a limiting portion for limiting the moving distance of the release ejector pin.

4. The portable fuse tripping detection device suitable for ring main unit according to claim 1, characterized in that: The lower front end of the sealing end cover is provided with two bayonet holes, and lugs corresponding to the bayonet holes are symmetrically provided on both sides of the middle part of the baffle, and the two lugs are respectively rotatably engaged in the corresponding bayonet holes.

5. The portable fuse tripping detection device suitable for ring main unit according to claim 4, characterized in that: A stopper is also provided on one of the two bayonet ports, and the stopper is located in front of the blocking piece.

6. The portable fuse tripping detection device suitable for ring main unit according to claim 1, characterized in that: The sealing end cover and the simulated fuse are fastened together through a first claw clamp and a first throat hoop.

7. The portable fuse tripping detection device suitable for ring main unit according to claim 1, characterized in that: The end sealing cover slot is detachably fixed on the sealing end cover.

8. The portable fuse tripping detection device suitable for ring main unit according to claim 1, characterized in that: Also included is an extension assembly, which is detachably fastened to the dummy fuse.

9. The portable fuse tripping detection device suitable for ring main unit according to claim 8, characterized in that: The extension assembly and the simulated fuse are fastened together through a second claw clamp and a second throat clamp.

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