Replacement device for plug-in voltage transformer built-in fuse that can achieve grounding

Abstract

The replacement device for the plug-in voltage transformer built-in fuse that can achieve grounding disclosed by the present invention includes a conductive rod, a conductive sleeve, a wire spring, an insulating rod, and a grounding component. A fuse blade head is configured on the conductive rod; the conductive sleeve is sleeved on the conductive rod and is electrically connected to the conductive rod; the conductive spring is arranged in the inner hole of the conductive sleeve and acts on the conductive rod and the conductive sleeve at both ends respectively, and the grounding component is electrically connected to the conductive sleeve and is used to connect with the substation grounding wire during the replacement process of the fuse retaining ring. Different from the current conventional "-" shaped screwdriver, the present invention realizes grounding continuity and increases the rotation lever arm during the disassembly and assembly process, and ensures the safety of the operator. It fills the safety gap during the replacement after the plug-in voltage transformer fuse in the substation is blown, and meets the requirement that both ends of the components replaced in the substation need to be reliably grounded. The insulating rod can increase the lever arm during rotation and meet the safety distance of the operator from the live body.

Description

Technical Field

[0001] The invention belongs to the field of power equipment, and particularly relates to a replacement device for grounding a fuse after an overload fuse of a plug-in voltage transformer in a gas-insulated switchgear is blown. Background Art

[0002] Plug-in voltage transformers have been accepted by users in recent years due to their high reliability, maintenance-free, miniaturization, and immunity to environmental influences, and have been widely used in gas-insulated switchgears.

[0003] See Figures 1 to 3 , generally, the fuse 1 of the plug-in voltage transformer 4 is connected to the plug 3 through a fuse retaining ring 2. During the replacement process of the fuse 1, little consideration is given to the floating voltage on the coil side after the fuse 1 is blown, and only the secondary reverse power supply part during the replacement process is considered. The conventional method is to use a grounding wire to temporarily and instantaneously discharge the coil side of the fuse 1, and the voltage on the secondary side of the voltage transformer is disconnected from the air switch and a warning sign is hung. This discharge method cannot achieve the continuity of grounding during the replacement process. There are safety hazards during the replacement of the fuse, such as the occurrence of secondary reverse power supply during the replacement process and the situation where the floating voltage is not effectively discharged. In addition, the disassembly and assembly of the existing fuse retaining ring are also relatively troublesome. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a replacement device for a plug-in voltage transformer internal fuse that can be grounded, which is convenient for disassembling and assembling the fuse retaining ring, and can solve the problems of secondary reverse power supply on the secondary side of the voltage transformer during the disassembly and assembly of the fuse retaining ring, ensure the safety distance of the floating voltage on the coil side of the voltage transformer for the operator, and the continuity of grounding during the disassembly and assembly of the fuse retaining ring.

[0005] The technical problem to be solved by the present invention can be achieved through the following technical solutions:

[0006] A replacement device for a plug-in voltage transformer internal fuse that can be grounded, comprising:

[0007] A conductive rod, and a fuse blade for tightening and loosening is arranged at the first end of the conductive rod;

[0008] A conductive sleeve sleeved on the conductive rod and electrically connected to the conductive rod, the conductive rod passes through the inner hole of the conductive sleeve and can perform rotational motion and linear motion in the inner hole of the conductive sleeve;

[0009] A conductive spring arranged in the inner hole of the conductive sleeve and acting on the conductive rod and the conductive sleeve at both ends respectively, the conductive spring drives the conductive rod to move outwards;

[0010] An insulating rod, one end of the insulating rod is fixedly connected to the second end of the conductive rod, and it drives a rotational movement by rotating the insulating rod;

[0011] A grounding component electrically connected to the conductive sleeve, and the grounding component is used for connecting to the substation grounding wire during the replacement process of the fuse retaining ring.

[0012] In a preferred embodiment of the present invention, the inner hole of the conductive sleeve is a stepped hole, having a large-diameter inner hole and a small-diameter inner hole, and a first stepped surface is provided between the large-diameter inner hole and the small-diameter inner hole; the conductive rod is composed of a large-diameter cylindrical section and a small-diameter cylindrical section, and a second stepped surface is provided between the large-diameter cylindrical section and the small-diameter cylindrical section. One end of the large-diameter cylindrical section opposite to the second stepped surface is the first end of the conductive rod. The large-diameter cylindrical section of the conductive rod is in sliding fit and electrically connected with the large-diameter inner hole of the conductive sleeve, and the small-diameter cylindrical section of the conductive rod is in sliding fit and electrically connected with the small-diameter inner hole of the conductive sleeve; the conductive spring is arranged on the small-diameter cylindrical section, one end of the conductive spring acts on the first stepped surface, and the other end of the conductive spring acts on the second stepped surface.

[0013] In a preferred embodiment of the present invention, one end of the small-diameter cylindrical section opposite to the second stepped surface is the second end of the conductive rod. A screw is provided at the second end of the conductive rod, and a threaded hole is provided at one end of the insulating rod. The screw is screwed into the threaded hole so that one end of the insulating rod is fixedly connected to the second end of the conductive rod.

[0014] In a preferred embodiment of the present invention, an insulating handle is installed at the other end of the insulating rod, and rotating the insulating handle can drive the insulating rod to rotate.

[0015] In a preferred embodiment of the present invention, the grounding component includes a grounding wire and a conductive clip. One end of the grounding wire is electrically connected to the conductive sleeve, and the conductive clip is used for connecting to the substation grounding wire during the replacement process of the fuse retaining ring.

[0016] Due to the adoption of the above technical solutions, the present invention can solve the following problems:

[0017] 1) Solve the problem of disassembly and assembly of the fuse retaining ring;

[0018] 2) Solve the problem of reverse power transmission on the secondary side of the voltage transformer during the disassembly and assembly of the fuse retaining ring and ensure the safety distance of the floating voltage on the coil side of the voltage transformer from the operator;

[0019] 3) Solve the problem of grounding continuity during the disassembly and assembly of the fuse retaining ring.

[0020] The beneficial effects of the present invention are as follows: The replacement device for the plug-in voltage transformer with an in-built fuse is different from the current conventional "-" shaped screwdriver. During the disassembly and assembly process, it realizes the continuity of grounding, increases the rotation lever arm, and ensures the safety of the operator. It fills the safety gap in replacing the fuse of the plug-in voltage transformer in the substation and meets the requirement of reliable grounding at both ends when replacing components in the substation. The insulating rod can increase the lever arm during rotation and meet the safety distance of the operator from the live body.

[0021] The structure of the present invention is flexible and the operation is simple. It has high practicability and is applicable to most 12 kV - 40.5 kV plug-in voltage transformers. It provides safety protection for on-site operation and maintenance personnel and effectively solves the operation and maintenance requirements of ensuring reliable grounding on both sides during the process of replacing the fuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 FIG. is a schematic structural diagram of the existing plug-in voltage transformer.

[0023] Figure 2 FIG. is a schematic structural diagram of the fuse retaining ring.

[0024] Figure 3 is Figure 2 top view of

[0025] Figure 4 FIG. is a schematic structural diagram of the replacement device of the present invention.

[0026] Figure 5 FIG. is a schematic main wiring diagram of the voltage transformer.

[0027] Figure 6 FIG. is an assembly schematic diagram among the conductive rod, conductive sleeve, conductive spring and insulating rod. DETAILED DESCRIPTION OF THE INVENTION

[0028] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0029] Refer to Figure 4 and Figure 6 As shown in the figures, the replacement device for the plug-in voltage transformer with an in-built fuse that can achieve grounding includes a conductive rod 10, a conductive sleeve 20, a wire spring 30, an insulating rod 40 and a grounding component 50.

[0030] The conductive rod 10 is composed of a large-diameter cylindrical section 11 and a small-diameter cylindrical section 12. A second stepped surface 13 is provided between the large-diameter cylindrical section 11 and the small-diameter cylindrical section 12. One end of the large-diameter cylindrical section 11 opposite to the second stepped surface 13 is the first end of the conductive rod 10, and one end of the small-diameter cylindrical section 12 opposite to the second stepped surface 13 is the second end of the conductive rod 10. A loose and tight fuse blade 14 is arranged at the first end of the conductive rod 10.

[0031] The inner hole of the conductive sleeve 20 is a stepped hole, having a large-diameter inner hole 21 and a small-diameter inner hole 22. A first stepped surface 23 is provided between the large-diameter inner hole 21 and the small-diameter inner hole 22.

[0032] The conductive sleeve 20 is sleeved on the conductive rod 10. The conductive rod 10 passes through the inner hole of the conductive sleeve 20 and can perform rotational motion and linear motion in the inner hole of the conductive sleeve 20. Among them, the large-diameter cylindrical section 11 of the conductive rod 10 is in sliding fit and electrically connected with the large-diameter inner hole 21 of the conductive sleeve 20, and the small-diameter cylindrical section 12 of the conductive rod 10 is in sliding fit and electrically connected with the small-diameter inner hole 22 of the conductive sleeve 20.

[0033] The conductive spring 30 is arranged on the small-diameter cylindrical section 12. One end of the conductive spring 30 acts on the first stepped surface 23, and the other end of the conductive spring 30 acts on the second stepped surface 13. The conductive spring 30 drives the conductive rod 10 to move outwards.

[0034] A screw 15 is provided at the second end of the conductive rod 10. A screw hole 41 is provided at one end of the insulating rod 40. The screw 15 is screwed into the screw hole 41 and a pin 44 is inserted, so that one end of the insulating rod 40 is fixedly connected to the second end of the conductive rod 10.

[0035] An insulating handle 42 is installed at the other end of the insulating rod 40. The insulating handle 42 is connected to the insulating rod 40 by a pin 43. Rotating the insulating handle 42 can drive the insulating rod 40 to rotate.

[0036] The grounding component 50 includes a copper grounding wire 51 and a copper conductive clip 52. One end of the copper grounding wire 51 is electrically connected to the grounding connection hole 24 on the conductive sleeve 20. The copper conductive clip 52 is used to connect to the substation grounding wire during the replacement process of the fuse retaining ring

[0037] Compared with the conventional method of directly removing the fuse retaining ring with a "-" shaped screwdriver to replace the fuse, there may be a situation of reverse power transmission of the secondary side voltage of the voltage transformer or the floating voltage on the coil side not being released, and the safety cannot be effectively guaranteed. Through the device of the present invention, the safety guarantee of on-site operation and maintenance personnel can be solved, and the operation and maintenance requirements of ensuring reliable grounding on both sides during the replacement of the fuse can also be effectively solved, realizing the grounding continuity during the replacement process, and being more in line with the maintenance operation procedures.

[0038] The operation process of the present invention is as follows:

[0039] After the fuse of the plug-in voltage transformer 60 is blown, first close the three-position switch 70 to the grounding position to complete the grounding of the plug and unplug side of the voltage transformer ( Figure 3 ). Complete the connection of the copper conductive clamp 52 of the replacement device to the grounding wire in the substation to ground the replacement device. Remove the plug-in voltage transformer plug, align the tightening and loosening fuse knife head 14 by holding the insulating handle 42 and embed it into the "-" shaped groove of the fuse retaining ring 80, and rotate it to remove the fuse retaining ring 80. After the fuse retaining ring 80 is removed, use the tightening and loosening fuse knife head 14 to press the fuse 90, and this component can be ejected by the internal spring pressure for replacement. Conversely, perform the reset.

[0040] During the replacement process, rotate by holding the insulating handle 42, and drive the conductive rod 10 to operate through the insulating rod 40. During the rotation of the conductive rod 10, the conductive spring 30, and the conductive sleeve 20, conductive contact is made by using a certain compression amount of the conductive spring 30 ( Figure 4 ), and then limit the conductive sleeve 20 by using the self-weight of the copper grounding wire 51 and the copper conductive clamp 52 and the grounding wire in the substation to prevent it from rotating or reducing rotation

[0041] Through the above implementation method, the grounding continuity during the replacement process of the fuse 90 is achieved, ensuring the safety of the operators. The safety during the replacement of the plug-in voltage transformer fuse in the substation is guaranteed, meeting the requirement that both ends of the component to be replaced in the substation need to be reliably grounded.

Claims

1. A replacement device for a plug-in type voltage transformer built-in fuse that can achieve grounding, characterized in that, Comprising: A conductive rod, at the first end of the conductive rod, a loose fuse knife head is arranged; A conductive sleeve sleeved on the conductive rod and electrically connected to the conductive rod, the conductive rod passes through the inner hole of the conductive sleeve and can perform rotational movement and linear movement in the inner hole of the conductive sleeve; A conductive spring arranged in the inner hole of the conductive sleeve and acting on the conductive rod and the conductive sleeve at both ends respectively, the conductive spring drives the conductive rod to move outwards; An insulating rod, one end of the insulating rod is fixedly connected to the second end of the conductive rod, and the rotational movement is driven by rotating the insulating rod; A grounding component electrically connected to the conductive sleeve, the grounding component is used for connecting with the substation grounding wire during the replacement of the fuse retaining ring; The inner hole of the conductive sleeve is a stepped hole, having a large-diameter inner hole and a small-diameter inner hole, and a first stepped surface is arranged between the large-diameter inner hole and the small-diameter inner hole; the conductive rod is composed of a large-diameter cylindrical section and a small-diameter cylindrical section, and a second stepped surface is arranged between the large-diameter cylindrical section and the small-diameter cylindrical section. The end of the large-diameter cylindrical section opposite to the second stepped surface is the first end of the conductive rod. The large-diameter cylindrical section of the conductive rod is in sliding fit and electrically connected with the large-diameter inner hole of the conductive sleeve, and the small-diameter cylindrical section of the conductive rod is in sliding fit and electrically connected with the small-diameter inner hole of the conductive sleeve; the conductive spring is arranged on the small-diameter cylindrical section, one end of the conductive spring acts on the first stepped surface, and the other end of the conductive spring acts on the second stepped surface; The grounding component includes a copper grounding wire and a copper conductive clip, one end of the copper grounding wire is electrically connected to the conductive sleeve, and the copper conductive clip is used for connecting with the substation grounding wire during the replacement of the fuse retaining ring.

2. The replacement device for the plug-in type voltage transformer built-in fuse that can achieve grounding according to claim 1, characterized in that The end of the small-diameter cylindrical section opposite to the second stepped surface is the second end of the conductive rod. A screw rod is arranged at the second end of the conductive rod, and a screw hole is arranged at one end of the insulating rod. The screw rod is screwed into the screw hole so that one end of the insulating rod is fixedly connected to the second end of the conductive rod.

3. The replacement device for realizing grounding of the plug-in type voltage transformer built-in fuse according to claim 1, characterized in that, An insulating handle is installed at the other end of the insulating rod, and rotating the insulating handle can drive the insulating rod to rotate.

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