CN210323249U - Medium voltage cable shielding layer corrosion inspection inter-phase switching device - Google Patents
Medium voltage cable shielding layer corrosion inspection inter-phase switching device Download PDFInfo
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- CN210323249U CN210323249U CN201920845742.2U CN201920845742U CN210323249U CN 210323249 U CN210323249 U CN 210323249U CN 201920845742 U CN201920845742 U CN 201920845742U CN 210323249 U CN210323249 U CN 210323249U
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Abstract
The utility model relates to a medium voltage cable detects technical field, more specifically relates to an alternate auto-change over device of medium voltage cable shielding layer corrosion check. The device comprises an insulating bottom plate, a reversing handle, a wiring terminal and a wiring terminal; the binding posts comprise an A-end binding post, a B-end binding post, a C-end binding post and an L-end binding post; the wiring terminals comprise an A1 wiring terminal, a B1 wiring terminal and a C1 wiring terminal which are respectively and electrically connected with the A terminal wiring terminal, the B terminal wiring terminal and the C terminal wiring terminal; the reversing handle is electrically connected with the L-end wiring column, the reversing handle is rotatably connected with the L-end wiring column, and the reversing handle can be rotatably connected with an electric circuit between the L-end wiring column and the wiring terminal. The test of the three-phase cable can be conveniently completed through one-time wiring, the operation is simple and convenient, and the test efficiency is improved.
Description
Technical Field
The utility model relates to a medium voltage cable detects technical field, more specifically relates to an alternate auto-change over device of medium voltage cable shielding layer corrosion check.
Background
Any medium voltage cable all can set up the metallic shield layer, and the metallic shield layer has the effect in two aspects: on one hand, the cable core voltage is very high, taking a 10kV cable as an example, the cable core voltage reaches 5.7kV, and the Maxwell electromagnetic theory can know that the high alternating voltage inevitably generates a very strong electromagnetic field around the cable core voltage, if shielding measures are not taken, interference can be generated on surrounding equipment, the metal shielding layer is like a Faraday cage, the magnetic field can be limited in the cable core range, and meanwhile, the influence of external electromagnetism on the cable can be avoided; on the other hand, the metal shielding layer provides a capacitance current channel when the cable can normally operate, and when the cable is in a ground short circuit, the metal shielding layer provides a leakage channel of short-circuit current. Therefore, the cable shield plays a very important role in cable operation, and its operation must be checked.
The metal shielding layer of the medium-voltage cable generally adopts two modes of a copper mesh and a copper strip, and the metal shielding layer can be corroded and even broken frequently due to the relatively severe operating environment of the medium-voltage cable, so that the safe operation of the cable is influenced. At present, the running state of the metal shielding layer can be checked by adopting a traveling wave reflection method. The test wiring is as shown in figure 1 in the attached drawing, the L line of the pulse reflectometer is connected with a cable core, the N line is connected with a cable shielding layer, and for a three-core cable, the three-phase cable is in short connection with the three-phase shielding layer, so that the three-phase test can be completed only by changing the L line at the cable end during the test, and the three-phase cable is independent of the single-core cable, so that the three-phase test can be completed only by changing the L line and the N line at the cable end during the test, and the test efficiency is low.
Publication No.: CN101252239B discloses a shielded wire switching device in the electrical technology field. The three contacts of the three-contact travel switch are respectively connected to the three BNC connectors by patch cords with shielding layers, the travel switch is integrally wrapped by the flexible shielding layers, the patch cord shielding layers are connected with the wrapping layers, the separation points of the patch cord shielding layers and the wire cores are located in the wrapping range, the tail end of a T-shaped insulating rod is connected to the end part of a pushing rod of a direct-acting electromagnet, and one movable side of the wrapped travel switch is placed at the top end of a T-shaped insulating push rod. This scheme cannot achieve commutation.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide an alternate auto-change over device of medium voltage cable shielding layer corrosion check, can conveniently accomplish the test of three-phase cable through a wiring, it is easy and simple to handle, improve efficiency of software testing.
In order to solve the technical problem, the utility model discloses a technical scheme is: an interphase switching device for corrosion inspection of a medium-voltage cable shielding layer comprises an insulating bottom plate, a reversing handle, a wiring terminal and a wiring terminal;
the binding posts comprise an A-end binding post, a B-end binding post, a C-end binding post and an L-end binding post which are arranged on the insulating bottom plate; (the necessary feature is not present in the absence of any substitution of how the four terminals are connected to the insulating base plate)
The wiring terminals comprise an A1 wiring terminal, a B1 wiring terminal and a C1 wiring terminal which are respectively and electrically connected with the A terminal wiring terminal, the B terminal wiring terminal and the C terminal wiring terminal;
the reversing handle is electrically connected with the L-end wiring column, the reversing handle is rotatably connected with the L-end wiring column, and the reversing handle can be rotatably connected with an electric circuit between the L-end wiring column and the wiring terminal.
This device can carry out the three-phase test to middling pressure three-core cable and middling pressure single core cable, wherein, when middling pressure three-core cable three-phase test, A end terminal, B end terminal, C end terminal are connected with the A, B, C three-phase cable cores of cable respectively, L end terminal and pulse reflectometer L line connection, pulse reflectometer N line is connected with the cable shield layer, thereby make reversing handle connect A1 binding post, B1 binding post or C1 binding post realize alternate switching through rotatory reversing handle. When the medium-voltage single-core cable is tested, because the A, B, C three-phase shielding layers are independent, when the cable is used, the A-end wiring terminal, the B-end wiring terminal and the C-end wiring terminal are respectively connected with the cable A, B, C three-phase shielding layer, the L is connected with the pulse reflectometer N line, the cable A, B, C three-phase cable core short circuit is connected with the pulse reflectometer L line, and the phase change method is similar to the phase change method.
Furthermore, one end of the reversing handle is rotatably connected with the end of the L-shaped end, and the other end of the reversing handle is provided with an alligator clip. The crocodile clip can be clamped on the reversing handle to avoid falling off.
Furthermore, the crocodile clip comprises two clip bodies which are hinged in a crossed mode, each clip body consists of a clip head and a clip tail, and a spring is arranged between the two clip tails. The clamp can clamp the wiring terminal under the elastic force of the spring, and the operation is convenient.
Furthermore, a saw-tooth contact surface is arranged on the clamping end surface of the chuck. The serrated contact surface can increase the contact pressure.
Furthermore, the insulating bottom plate is an epoxy resin insulating plate, and the A1 wiring terminal, the B1 wiring terminal and the C1 wiring terminal are embedded on the epoxy resin insulating plate. The epoxy resin insulating board is light, insulating and easy to process.
Furthermore, the wiring terminal is connected with the wiring terminal through a copper sheet.
Furthermore, the connecting terminal is of a 20866type structure. The structure can facilitate the clamping of the crocodile clip.
Furthermore, the reversing handle is made of stainless steel.
Furthermore, an operation section is arranged on the reversing handle and is made of an insulating material.
Furthermore, the operation section is arranged in the reverse extension direction of one end of the reversing handle connected with the L-end connecting wire column.
Compared with the prior art, the beneficial effects of the utility model are that: this device is more convenient for current shielding layer three-phase test use, can be through the convenient test of accomplishing the three-phase cable of once working a telephone switchboard, and is easy and simple to handle, improves efficiency of software testing.
Drawings
FIG. 1 is a schematic diagram of a prior art test connection;
FIG. 2 is a schematic view of the overall structure of the present invention;
fig. 3 is a schematic structural view of the alligator clip of the present invention.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are the terms "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of the description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and those skilled in the art can understand the specific meanings of the terms according to specific situations.
Example 1:
as shown in fig. 2 and 3, the interphase switching device for corrosion detection of the medium-voltage cable shielding layer comprises an insulating bottom plate 40, a reversing handle 30, a wiring terminal and a wiring terminal;
the number of the binding posts is 4, and the binding posts are respectively an A-terminal binding post 101, a B-terminal binding post 102, a C-terminal binding post 103 and an L-terminal binding post 104 which are arranged on the insulating bottom plate 40;
the number of the wiring terminals is 3, namely an A1 wiring terminal 201, a B1 wiring terminal 202 and a C1 wiring terminal 203, the A1 wiring terminal 201 is electrically connected with the A-terminal wiring column 101, the B1 wiring terminal 202 is electrically connected with the B-terminal wiring column 102, and the C1 wiring terminal 203 is electrically connected with the C-terminal wiring column 103.
The reversing handle 30 is of a conductive structure, one end of the reversing handle 30 is rotatably connected with the L-end wiring column 104, the reversing handle 30 can rotate along the L-end wiring column 104, the A1 wiring terminal 201, the B1 wiring terminal 202 and the C1 wiring terminal 203 are arranged on the insulating bottom plate 40, and the A1 wiring terminal 201, the B1 wiring terminal 202 and the C1 wiring terminal 203 are respectively arranged on a circumferential track at the other end of the reversing handle 30.
The reversing lever 30 is electrically connected to the L-terminal post 104, and when the reversing lever 30 is rotated to the corresponding terminal, the reversing lever 30 can complete an electrical circuit between the L-terminal post 104 and the terminal.
In addition, in this embodiment, an alligator clip is disposed at an end of the reversing handle 30 away from the L-terminal binding post 104, the alligator clip includes two clip bodies hinged in a crossing manner, the clip body is composed of a clip 301 and a clip tail 302, and a spring 303 is disposed between the two clip tails 302. The clamp 301 can clamp the wiring terminal under the action of the elastic force of the spring 303, and the operation is convenient.
In particular, the gripping end surface of the collet 301 is provided with a serrated contact surface 304. The serrated contact surface 304 may increase the contact pressure.
In the present embodiment, the insulating base plate 40 is an epoxy insulating plate, and the a1 connection terminal 201, the B1 connection terminal 202, and the C1 connection terminal 203 are mounted on the epoxy insulating plate. The epoxy resin insulating board is light, insulating and easy to process. In addition, other insulating materials may be used as the material for the insulating base plate 40.
In order to better ensure an electric connection loop between the wiring terminal and the wiring terminal, the wiring terminal and the wiring terminal are connected through a copper sheet. In order to facilitate the clamping of the connecting terminal by the crocodile clip, the connecting terminal is arranged to be of a structure of a shape of a '20866', and the clamping head 301 of the crocodile clip can clamp the connecting terminal and is not easy to fall off. In addition, in order to ensure the durability and conductivity of the reversing lever 30, the reversing lever 30 is made of stainless steel.
This device can carry out the three-phase test to middling pressure three-core cable and middling pressure single core cable, wherein, when middling pressure three-core cable three-phase test, A end terminal 101, B end terminal 102, C end terminal 103 are connected with the A, B, C three-phase cable cores of cable respectively, L end terminal post 104 and pulse reflectometer L line connection, pulse reflectometer N line is connected with the cable shield layer, thereby make reversing handle 30 connect A1 binding post 201, B1 binding post 202 or C1 binding post 203 realize alternate switching through rotatory reversing handle 30. When the medium-voltage single-core cable is tested, because A, B, C three-phase shielding layers are independent, when the cable is used, the A-end wiring terminal 101, the B-end wiring terminal 102 and the C-end wiring terminal 103 are respectively connected with the cable A, B, C three-phase shielding layer, the L is connected with the N line of the pulse reflectometer, the short circuit of the three-phase cable core of the cable A, B, C is connected with the L line of the pulse reflectometer, and the reversing handle 30 is connected with the A1 wiring terminal 201, the B1 wiring terminal 202 or the C1 wiring terminal 203 by rotating the reversing handle 30, so that inter-phase switching is realized.
Example 2:
the present embodiment is similar to embodiment 1, except that in the present embodiment, an operation section 305 is further disposed in an opposite direction at the end of the reversing handle 30 connected to the L-terminal binding post 104, wherein the operation section 305 is made of an insulating material, and when performing the phase change operation, a worker can hold the operation section 305 to rotate the reversing handle 30, so as to avoid electric shock to the worker. Besides, the operation section 305 can be disposed at other positions of the reversing handle 30, the illustrated arrangement position of the embodiment is only one of the arrangement modes, and other arrangement positions should be included in the protection scope of the present invention.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The inter-phase switching device for corrosion inspection of the medium-voltage cable shielding layer is characterized by comprising an insulating bottom plate (40), a reversing handle (30), a wiring terminal and a wiring terminal;
the binding posts comprise an A-end binding post (101), a B-end binding post (102), a C-end binding post (103) and an L-end binding post (104) which are arranged on an insulating bottom plate (40); the wiring terminal comprises an A1 wiring terminal (201), a B1 wiring terminal (202) and a C1 wiring terminal (203) which are respectively electrically connected with an A terminal post (101), a B terminal post (102) and a C terminal post (103);
reversing handle (30) be connected with L end terminal (104) electricity, reversing handle (30) rotate with L end terminal (104) and be connected, reversing handle (30) rotatable switch-on L end terminal (104) and the electric circuit between the binding post.
2. The inter-phase switching device for the corrosion detection of the shielding layer of the medium-voltage cable according to claim 1, wherein one end of the reversing handle (30) is rotatably connected with an L-shaped terminal wire end, and the other end of the reversing handle is provided with an alligator clip.
3. A medium voltage cable shield corrosion inspection inter-phase switching device according to claim 2, characterized in that said alligator clamp comprises two cross-hinged clamp bodies, said clamp bodies consisting of a collet (301) and a tail (302), a spring (303) being arranged between said two tail (302).
4. A medium voltage cable shield corrosion inspection inter-phase switching device according to claim 3, characterized in that the clamping end face of said clamping head (301) is provided with a saw-toothed contact face (304).
5. The medium voltage cable shield corrosion inspection inter-phase switching device of claim 1, wherein said insulating base plate (40) is an epoxy insulating plate, and said a1 terminal (201), B1 terminal (202) and C1 terminal (203) are embedded on the epoxy insulating plate.
6. The medium voltage cable shielding layer corrosion inspection inter-phase switching device according to claim 1, wherein the connection terminal and the connection terminal are connected by a copper sheet.
7. The inter-phase switching device for the corrosion inspection of the shielding layer of the medium-voltage cable according to claim 1, wherein the connecting terminal is of a 20866; "type structure.
8. A medium voltage cable shield corrosion inspection inter-phase switching device according to claim 7, characterized in that said reversing lever (30) is made of stainless steel.
9. A medium voltage cable shield corrosion inspection inter-phase switching device according to claim 2, characterized in that said reversing lever (30) is provided with an operating section (305), said operating section (305) being made of an insulating material.
10. A medium voltage cable shield corrosion inspection inter-phase switching device according to claim 9, wherein said operating section (305) is provided in a reverse extending direction of an end of the reversing lever (30) connected to the L-terminal post (104).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920845742.2U CN210323249U (en) | 2019-06-05 | 2019-06-05 | Medium voltage cable shielding layer corrosion inspection inter-phase switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920845742.2U CN210323249U (en) | 2019-06-05 | 2019-06-05 | Medium voltage cable shielding layer corrosion inspection inter-phase switching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210323249U true CN210323249U (en) | 2020-04-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920845742.2U Active CN210323249U (en) | 2019-06-05 | 2019-06-05 | Medium voltage cable shielding layer corrosion inspection inter-phase switching device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210323249U (en) |
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- 2019-06-05 CN CN201920845742.2U patent/CN210323249U/en active Active
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