CN211348367U

CN211348367U - Overhead fault indicator

Info

Publication number: CN211348367U
Application number: CN201922366712.6U
Authority: CN
Inventors: 黄雄凯; 张国; 阳武; 王轶
Original assignee: Changsha Hengdian Juneng Electronic Technology Co ltd
Current assignee: Changsha Hengdian Juneng Electronic Technology Co ltd
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2020-08-25
Anticipated expiration: 2029-12-25

Abstract

The utility model discloses an overhead type fault indicator, including drain pan, camber beam, lower iron core and last iron core, the wire clamping subassembly includes wire clamping spring and metal support, the metal support passes through threaded fastener and installs on the drain pan, wire clamping spring articulates on the metal support through the round pin axle, it still includes PCBA board and electric field piece to get to sample the subassembly, the PCBA board is installed in the drain pan, the electric field piece is installed in the casing, the electric field piece includes along the peripheral upper and lower hot fusion connect a plurality of layers as an organic whole and through the hot fusion seal installation at the sheetmetal between adjacent insulating piece, be equipped with the solder joint that runs through insulating piece and each sheetmetal independent intercommunication in the electric field piece outside, the sheetmetal in the electric field piece passes through corresponding solder joint tandem connection of wire connection, the sheetmetal in the electric field piece passes through solder joint and wire and PCBA board electrical connection. The utility model can effectively reduce the cracking phenomenon of the device body caused by the large torsion of the spring; the capacitance induction is strong; the anti-interference capability is strong; the waterproof and dustproof effects are good, and the outdoor use condition is not attenuated.

Description

Overhead fault indicator

Technical Field

The utility model relates to a power transmission and distribution lines on-line monitoring equipment especially relates to an overhead type fault indicator.

Background

As main physical equipment in the power transmission link of a power grid, a power transmission line is the most huge component of a power system, the power transmission line has severe operating environment, complex terrain and difficult maintenance, and has important influence on the safety and reliability of the power system. Therefore, in a ring network distribution system, especially a system using a large number of ring network load switches, if a short-circuit fault or a ground fault occurs in a next-stage distribution network system, a power supply system of a previous stage must be disconnected within a specified time to prevent a major accident from occurring.

The overhead fault indicator is used for detecting and identifying whether a power line has a fault or not, and the working principle of the overhead fault indicator is that when the power line has faults such as short circuit, grounding and the like, due to the fact that electrical parameters in the line change suddenly, magnetic fields and electric fields are generated around the power line, a control line in the power line fault indicator automatically detects and judges a fault state, fault sections, branches and fault points are determined, an alarm signal is output to drive a display part to work, and red is displayed in an alarm mode, so that the purpose of indicating the fault line is achieved, and inspection workers can conveniently repair and maintain the line.

The existing overhead fault indicator is provided with a sampling module by a wire clamping spring or a wire clamping spring and an electric field sheet, and like the Chinese patent with an authorization publication number of CN207472909U applied by the company, the invention discloses an energy-taking and sampling module for a fault indicator acquisition unit, which comprises a bottom shell, a bent beam, a wire clamping spring and a closed spring, wherein the bent beam, the wire clamping spring and the closed spring are hinged on the bottom shell, and the electric field sheet is used for electric field induction and conduction, an energy-taking iron core type current transformer is arranged in the bent beam and the bottom shell, the energy-taking iron core type current transformer is formed by electrically connecting an upper iron core, a lower iron core, a secondary coil winding and a power supply leading-out head, a sampling Rogowski coil current transformer is also arranged in the bottom shell and the bent beam, and the sampling Rogowski coil current transformer is formed by sequentially and electrically connecting two sections of an arc-shaped printed Rogowski coil, a, the two Rogowski coils are arranged in the curved beam and the bottom shell in a centripetal mode respectively, the switching printed boards are installed on the bottom shell, the connecting wires are arranged inside the curved beam and the bottom shell, the electric field pieces are fixedly connected to the bottom shell, one end of each electric field piece is in elastic lap joint with the wire clamping spring, and the other end of each electric field piece is connected with the power supply leading-out head. Although the module can meet the protection requirement of outdoor long-term operation, the module is suitable for power line on-line monitoring equipment.

After long-term practice, we have found that the above-mentioned energy-taking and sampling module generally has the following disadvantages:

firstly, in order to prevent the shell from conducting electricity and leaking electricity, and cause people's safety, the drain pan of the overhead fault indicator is made of non-conducting plastic materials, and the deformation force of the wire clamping spring is utilized to directly press the high-voltage wire on the drain pan, so that the following failures are easily generated: 1. the plastic part is easy to age and is cracked by the large torsion of the spring; 2. welding line cracks are easy to occur in the injection molding process, and the cracks are easy to generate for a long time outdoors; 3. stress concentration failure of the plastic part and water inflow of the product affect the service life. After the plastic part is damaged, the device body cannot be fixed transversely or longitudinally, so that the device body directly falls off and is damaged from the high-voltage wire, and even the safety accident that objects fall from high altitude and smash the objects to be damaged can occur.

Two, electric field sampling is accomplished through line ball spring and electric field piece, and line ball spring and electric field piece belong to external member, and the interference killing feature is weak, and waterproof dustproof effect is poor, causes the unstable condition of electric capacity response occasionally to take place.

In view of the above, it is an urgent technical problem in the art to provide a new overhead fault indicator to overcome the above drawbacks in the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to prior art's weak point, provide a casing not receive the pressure line spring moment of torsion effect, the stable overhead type fault indicator of electric capacity response.

The utility model provides an overhead fault indicator, including the casing, install the clamp wire subassembly and get and can the sampling subassembly in the casing, the casing includes the drain pan and articulates the camber beam of installing on this drain pan, get and can the sampling subassembly including installing lower iron core and the last iron core in drain pan and camber beam correspondence, the clamp wire subassembly includes wire clamping spring and metal support, the metal support is installed on the drain pan through threaded fastener, wire clamping spring articulates on the metal support through the round pin axle, it can the sampling subassembly still include PCBA board and the electric field piece that is used for electric field induction sampling, PCBA board is installed in the drain pan, the electric field piece is installed in the casing, the electric field piece includes a plurality of layers of insulating pieces that connect as an organic whole along the upper and lower hot fusion of periphery and installs the metal piece between adjacent insulating piece through hot fusion seal, be equipped with the solder joint that runs through insulating piece and each metal piece independent intercommunication outside the electric field piece, the metal sheets in the electric field sheet are connected with corresponding welding points in series through wires, and the metal sheets in the electric field sheet are electrically connected with the PCBA board through the welding points and the wires.

In order to prevent the wire from being damaged by clamping, the wire clamping assembly further comprises an anti-skid rubber mat fixedly connected to the metal support.

The electric field plate is provided with one electric field plate and is arranged in the bottom shell above the lower iron core.

The two electric field pieces are respectively arranged in the bottom shell above the lower iron core and the bent beam below the upper iron core.

In order to ensure complete shielding, the size of the insulating sheet on the outer side is larger than that on the inner side in the electric field sheet.

In order to ensure the service durability of the product, the electric field sheet is hermetically installed in the bottom shell through pouring sealant.

In order to ensure the service durability of the product, the electric field pieces are hermetically arranged in the bottom shell and the bent beam through pouring sealant.

The utility model arranges a metal bracket on the bottom shell, and the wire clamping spring is hinged on the bottom shell through the metal bracket, so that the force of the spring pressing the wire is all born on the metal bracket and can not be transmitted to the plastic bottom shell, thereby effectively reducing the phenomenon that the device body is cracked due to the large torsion of the spring; the electric field sheet is made of multiple layers of metal in series connection, so that the induction area is large, the insulating medium is thin, and the capacitance induction is strong and stable; the metal sheets are packaged between the insulating sheets, so that the anti-interference capability is strong; the electric field sheet is wholly sealed in the shell, and the waterproof and dustproof effect is good, and the electric field sheet is not attenuated by outdoor use conditions.

Drawings

Fig. 1 is a schematic view of the shaft side partial cutting structure of the present invention.

Fig. 2 is a schematic view of a partial explosion structure in fig. 1.

Fig. 3 is a schematic sectional view at a-a in fig. 1.

FIG. 4 is a schematic cross-sectional view at B-B in FIG. 1.

Fig. 5 is an enlarged schematic view of the structure at the point I in fig. 4.

Fig. 6 is a schematic diagram of the explosion structure of the middle electric field plate of the present invention.

The labels shown in the figures and the corresponding component names are:

1. a bottom case; 11. a semicircular bracket;

2. bending the beam;

3. a wire clamping assembly; 31. a wire clamping spring; 32. a metal bracket; 33. an anti-slip rubber pad;

4. an energy-taking sampling component; 41. a lower iron core; 42. an upper iron core; 43. a PCBA board 43; 44. an electric field plate; 441. an insulating sheet; 442. a metal sheet; 443. welding spots; 4411. a through hole; 4421. a flange.

Detailed Description

Example one

As can be seen from fig. 1 to 6, the overhead fault indicator of the present invention comprises a housing, a wire clamping assembly 3 and an energy-taking sampling assembly 4, wherein the housing comprises a bottom shell 1 and a curved beam 2,

a semicircular bracket 11 is arranged at the top of the bottom shell 1, a shaft hole is arranged at one side of the semicircular bracket 11, the axis of the semicircular bracket 11 is arranged in parallel with the axis of the shaft hole,

the curved beam 2 is hinged on the bottom shell 1 through a curved beam shaft arranged in the shaft hole, the axis of the curved beam 2 is coaxially arranged with the axis of the semicircular bracket 11,

the wire clamping assembly 3 comprises two wire clamping springs 31, two metal supports 32 and an anti-slip rubber mat 33, the two metal supports 32 are symmetrically arranged on the bottom shell 1 at two axial ends of the semicircular bracket 11 through screws, the two wire clamping springs 31 are hinged between the two metal supports 32 in a face-to-face manner through corresponding pin shafts, the anti-slip rubber mat 33 is fixed on the two metal supports 32 through screws, the bottom of the anti-slip rubber mat 33 is connected with the semicircular bracket 11 in a clamping manner, the top surface of the anti-slip rubber mat 33 is in a crescent shape corresponding to the semicircular bracket 11, and the two wire clamping springs 31 are tightly propped against the anti-slip rubber mat 33 through self elasticity;

the energy taking and sampling assembly 4 comprises a lower iron core 41, an upper iron core 42, a PCBA (printed circuit board assembly) plate 43 and two electric field pieces 44 for electric field induction sampling, wherein the upper iron core 42 is installed in a bent beam 2, the lower iron core 41 is clamped on a bottom shell 1 under the upper iron core 42 through a sealing ring, the bottom surface of the upper iron core 42 penetrates through the bent beam 2 and is arranged in parallel with the bottom surface of the bent beam 2, the top surface of the lower iron core 41 penetrates through the bottom shell 1 and is arranged in parallel with the top surface of the bottom shell 1, and the lower iron core 41 and the upper iron core 42 are driven to be in an up-and-down butt joint to form a; the PCBA plate 43 is arranged in the bottom shell 1 below the lower iron core 41; an electric field plate 44 is installed in the bottom shell 1 above the lower iron core 41 in a sealing manner through pouring sealant, an electric field plate 44 is installed in the bent beam 2 below the upper iron core 42 in a sealing manner through pouring sealant, two electric field plates 44 respectively comprise four insulation plates 441 and three metal plates 442, the insulation plates 441 and the metal plates 442 are sequentially arranged in parallel in an alternating manner, each insulation plate 441 is connected into a whole along the periphery of the metal plate 442 through thermal fusion, the metal plates 442 are installed between the adjacent insulation plates 441 through thermal fusion in a sealing manner, different positions of each metal plate 442 are respectively provided with a flange 4421, corresponding positions of each insulation plate 441 are respectively provided with three through holes 4411, the three through holes 4411 are independently connected with the flanges 4421 on the three metal plates 442 in a one-to-one manner, three welding spots 443 which are independently communicated with the three through holes 4411 are arranged on the insulation plate 441 positioned on the outer side of the electric field plate 44, the first welding spot is, the second welding point is electrically connected with the third welding point through a conducting wire, and the metal sheets 442 in each electric field sheet 44 are connected into a whole in series through the conducting wire connected between the welding points 443; the third welding point of the electric field plate 44 in the bent beam 2 is connected with the first welding point of the electric field plate 44 in the bottom case 1 through a wire, the third welding point of the electric field plate 44 in the bottom case 1 is electrically connected with the PCBA 43 through a wire, and the metal sheets 442 in the two electric field plates 44 are connected into the PCBA for sampling analysis through corresponding welding points and wires.

In each electric field plate 44 of the present invention, the size of the outer side insulation sheet 441 is larger than the size of the inner side insulation sheet 441.

Example two

The present embodiment is different from the first embodiment in that only one electric field plate 44 for electric field induction sampling in the energy-taking sampling assembly 4 is installed in the bottom case 1 above the lower iron core 41 by pouring sealant.

Claims

1. The utility model provides an overhead type fault indicator, includes casing, double-layered line subassembly (3) and gets can sampling subassembly (4), and the casing includes drain pan (1) and articulated camber beam (2) of installing on this drain pan, gets can the sampling subassembly including installing lower iron core (41) and last iron core (42) that correspond the department at drain pan and camber beam, its characterized in that: the double-layered line subassembly includes wire clamping spring (31) and metal support (32), the metal support passes through threaded fastener and installs on the drain pan, wire clamping spring articulates on the metal support through the round pin axle, it still includes PCBA board (43) and is used for electric field induction sampling electric field piece (44) to get can the sampling subassembly, the PCBA board is installed in the drain pan, the electric field piece is installed in the casing, the electric field piece is including connecting a plurality of layers of insulating piece (441) as an organic whole and through hot melt seal installation metal sheet (442) between adjacent insulating piece about the periphery, be equipped with solder joint (443) that runs through insulating piece and each metal sheet independent intercommunication in the electric field piece outside, the metal sheet in the electric field piece connects corresponding solder joint series connection through the wire, the metal sheet in the electric field piece passes through solder joint and wire and PCBA board electrical connection.

2. The overhead fault indicator of claim 1, wherein: the wire clamping assembly further comprises an anti-skid rubber mat (33) fixedly connected to the metal support.

3. The overhead fault indicator of claim 1, wherein: the electric field plate is provided with one electric field plate and is arranged in the bottom shell above the lower iron core.

4. The overhead fault indicator of claim 1, wherein: the two electric field pieces are respectively arranged in the bottom shell above the lower iron core and the bent beam below the upper iron core.

5. Overhead fault indicator according to claim 3 or 4, characterized in that: in the electric field plate, the size of the insulating plate positioned on the outer side is larger than that of the insulating plate positioned on the inner side.

6. The overhead fault indicator of claim 3, wherein: the electric field piece is hermetically installed in the bottom shell through pouring sealant.

7. The overhead fault indicator of claim 4, wherein: the electric field pieces are hermetically installed in the bottom shell and the bent beam through pouring sealant.