Switching fitting for electric power transmission line

Abstract

The application relates to a switch type fitting for a power transmission line, the power transmission line comprising a tower and a conductor, the conductor comprising a main conductor and a branch conductor, the switch type fitting being arranged on the branch conductor and comprising an insulating base, a switching assembly, and a first wire clamp arranged on one side of the insulating base; the switching assembly comprising a conductive arm, a switch static contact and a switch dynamic contact finger, the conductive arm being arranged on one side of the insulating base through cooperation of a bearing seat, the switch static contact being arranged on the other side of the insulating base through cooperation of a contact mounting seat, the conductive arm being provided with the switch dynamic contact finger matched with the switch static contact on one side and a second wire clamp on the other side. The switch type fitting realizes current on-off of the branch conductor in the power transmission line through cooperation of the insulating base, the switching assembly and a cross-line insulator, directly realizes on-off of the single branch conductor, and does not need to cut off power supply of the whole connected main conductor and branch conductor, thereby facilitating maintenance of the single branch conductor.

Description

Technical Field

[0001] This invention relates to the field of power transmission line maintenance technology, and in particular to a switch-type fitting for power transmission lines. Background Technology

[0002] Transmission lines are the channels in a power system responsible for transmitting electrical energy generated by power plants over long distances and in large quantities to load centers or substations; they are the "main arteries" of the power grid. Transmission lines are complex systems composed of multiple components working together, and they are classified in different ways according to their construction method and the nature of the current.

[0003] Currently, common power transmission lines typically consist of conductors, towers, insulators, hardware, lightning protection wires, and grounding devices. Conductors: responsible for transmitting electrical energy, commonly made of materials such as steel-cored aluminum stranded wire, and must withstand tensile forces and environmental influences; Towers: supporting the conductors and maintaining a safe distance from the ground, categorized into different types such as straight-line towers, tension towers, and angle towers; Insulators: used to support and insulate the conductors, preventing current leakage to the towers or the ground; Hardware and grounding: connecting and fixing the conductors and protecting the line from damage such as lightning strikes.

[0004] In power transmission lines, the phenomena of line splitting and line merging are frequently encountered. Line splitting refers to the current being branched off from a main line and flowing to different branches or load points. Its main purpose is to distribute electrical energy to users in multiple different areas. Line merging refers to the current from multiple independent power sources or multiple branches being combined and connected to a main line with a higher voltage level or larger capacity for transmission. Its main purpose is to integrate dispersed electrical energy for long-distance transmission. The line connection points in line splitting and line merging are usually set at the towers.

[0005] In existing technologies, when a problem occurs in a branch line or a merging line that needs to be repaired or replaced, regardless of which branch line is faulty, all the main lines and branches of the entire connection must be disconnected before the faulty branch line can be repaired, which is very troublesome. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a switch-type fitting for transmission lines that facilitates the maintenance of branches for line branching or line merging.

[0007] To solve the above-mentioned technical problems, the technical solution of the present invention is: a switch-type fitting for transmission lines, wherein the transmission line includes towers and conductors installed on the towers, the conductors including main conductors and branch conductors, the innovation being that: the switch-type fitting is installed on the branch conductors to realize the switching of current in the branch conductors, including: An insulating base having a first surface and a second surface that are oppositely distributed; The first side of the insulating base is fixed to the tower by a cross-line insulator, and the second side of the insulating base is provided with a switching assembly; the second side of the insulating base has a first side and a second side that are distributed opposite to each other, and a first clamp for fixing the branch conductor is also installed on the first side of the insulating base; The circuit breaker assembly includes a conductive arm, a stationary switch contact, and a moving switch finger. The conductive arm is mounted on the first side of an insulating base via a bearing seat, and the stationary switch contact is mounted on the second side of the insulating base via a contact mounting seat. The conductive arm is V-shaped, with a moving switch finger that mates with the stationary switch contact mounted on one side and a second clamp for fixing the branch conductor mounted on the other side. A circuit breaker operation assembly is also provided on the conductive arm, and a circuit breaker holding assembly that mates with the conductive arm is also provided on the insulating base.

[0008] Furthermore, the conductive arm is a V-shaped structure formed by connecting a closing section and a opening section, and the connection between the closing section and the opening section is hinged to the bearing seat, and swings along the hinge point with the bearing seat. The switch moving contact finger is fixed to the end of the closing section by bolts, and the second wire clamp is installed at the end of the opening section. The opening and closing operation assembly includes an opening pull ring fitted on the outer wall of the closing section and a closing pull ring fitted on the outer wall of the opening section. The closing pull ring includes a closing pull ring body with a closing pull hole. One side of the closing pull ring body is fixed to the outer wall of the opening section by a fixing ring, and the fixing ring and the opening section are interference-fitted. The opening pull ring includes an opening pull ring body with an opening pull hole. One side of the opening pull ring body is fixed to the closing section by a fixing rod. A through hole for the fixing rod to pass through is opened in the closing section, and the fixing rod and the through hole of the closing section are interference-fitted.

[0009] Furthermore, the opening and closing holding assembly includes a closing holding spring and an opening holding spring; The closing holding spring includes a closing spring seat and a pair of closing spring plates mounted on the closing spring seat. The closing spring seat is fixed to one side of the bearing seat by bolts, and the closing spring seat and the bearing seat are fixed together on the insulating base by the same bolt. A gap is left between the two closing spring plates to accommodate the insertion of the conductor arm. Each closing spring plate includes a closing spring post. One side of the closing spring post is fixed to the closing spring seat, and the other side is provided with a closing hook. The closing hooks of the two closing spring plates are arranged opposite to each other, and the distance between the two closing hooks of the two closing spring plates is smaller than the distance between the two closing spring posts. The trip holding spring includes a trip spring seat and a pair of trip spring plates mounted on the trip spring seat. The trip spring seat is fixed to the other side of the bearing seat by bolts, and the trip spring seat and the bearing seat are fixed together to the insulating base by the same bolt. A gap is left between the two trip spring plates to accommodate the insertion of the conductor arm. Each trip spring plate includes a trip spring post, one side of which is fixed to the trip spring seat, and the other side is provided with a trip hook. The trip hooks of the two trip spring plates are arranged opposite to each other, and the distance between the two trip hooks of the two trip spring plates is less than the distance between the two trip spring posts.

[0010] Furthermore, pressure sensors are also provided on both the closing spring sheet and the opening spring sheet.

[0011] Furthermore, the first clamp is an assembly clamp, and the second clamp is a crimp clamp.

[0012] Furthermore, both the first and second wire clamps are equipped with temperature sensors for detecting the temperature of the clamping guide.

[0013] The advantages of this invention are as follows: The switch-type fitting in this invention achieves the switching of current on and off of branch conductors in the transmission line through the cooperation of the insulating base, the switching assembly and the cross-line insulator. It can directly realize the switching of individual branch conductors without the need to de-energize the entire connected main conductor and branch conductors, which facilitates the maintenance of individual branch conductors.

[0014] The installation of the insulating base on the tower in conjunction with the cross-line insulator ensures both the installation of the insulating base and the insulation performance of the insulating base, preventing the insulating base from becoming energized due to the influence of the tower and the transmission lines on the tower.

[0015] The temperature sensor is designed to detect the temperature of the branch wires clamped at the first and second clamps. This allows for the detection of any abnormal temperatures in the branch wires based on the temperature detected by the sensor, facilitating timely inspection of the branch wires and providing a solid foundation for the automation of the entire switch fitting system.

[0016] The design of the opening and closing operation components adopts the cooperation of the opening pull ring and the closing pull ring. It can be used in conjunction with an insulating rod with a hook. The insulating rod is used to pull the opening or closing pull ring, thereby driving the conductive arm to move, so as to realize the on and off of the entire switch hardware. This allows maintenance personnel to disconnect and connect the branch conductors that need to be maintained from below the tower, reducing the maintenance risk for maintenance personnel. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the switch fitting for power transmission lines according to the present invention.

[0018] Figure 2 This is a front view of the switch fitting for power transmission lines according to the present invention.

[0019] Figure 3 This is a side view of the switch fitting for power transmission lines according to the present invention.

[0020] Figure 4 This is a top view of the switch fitting for power transmission lines according to the present invention. Detailed Implementation

[0021] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0022] like Figures 1-4 The diagram illustrates a switch-type fitting for a power transmission line. The transmission line includes towers and conductors mounted on the towers. The conductors include main conductors and branch conductors. The switch-type fitting is mounted on the branch conductors and is used to control the flow of current in the branch conductors. An insulating base 1 is a rectangular plate having a first surface and a second surface that are relatively distributed.

[0023] The first side of the insulating base 1 is fixed to the tower with the cooperation of a cross-line insulator 2. The tower is equipped with a mounting bracket for fixing the cross-line insulator. The installation of the insulating base 1 on the tower with the cooperation of the cross-line insulator 2 not only realizes the installation of the insulating base, but also ensures the insulation performance of the insulating base 1, avoiding the influence of the tower and the transmission lines on the tower that may cause the insulating base 1 to become energized. Moreover, with the cooperation of the cross-line insulator 2, the switch fitting can be installed in the forward, inverted and side-mounted positions. The required installation method can be selected according to different branch conductors. When the switch fitting is side-mounted, an L-shaped mounting bracket can be used to make the side-mounted switch fitting in the inverted position.

[0024] A switching assembly is provided on the second surface of the insulating base 1. The second surface of the insulating base 1 has a first side and a second side that are relatively distributed. A first clamp 3 for fixing the branch conductor is also installed on the first side of the insulating base 1. The first clamp 3 is fixed to the insulating base 1 by bolts. The first clamp 3 is an assembled clamp.

[0025] The opening and closing assembly includes a conductive arm 4, a stationary switch contact 5, and a moving switch finger 6. The conductive arm 4 is mounted on the first side of the insulating base 1 through a bearing seat 7, and the stationary switch contact 5 is mounted on the second side of the insulating base 1 through a contact mounting seat 51. The contact mounting seat 51 is fixed to the insulating base 1 by bolts.

[0026] The conductive arm 4 is V-shaped, and a moving contact finger 6 that cooperates with the stationary contact 5 of the switch is installed on one side of the conductive arm 4. A second clamp for fixing the branch wire is installed on the other side of the conductive arm 4. A circuit breaker operation assembly is also provided on the conductive arm 4, and a circuit breaker holding assembly that cooperates with the conductive arm 4 is also provided on the insulating base 1.

[0027] Specifically, the conductive arm 4 is a V-shaped structure formed by connecting a closing section 41 and a opening section 42. The connection between the closing section 41 and the opening section 42 is hinged to the bearing seat 7, and the entire conductive arm 4 can swing along the hinge point with the bearing seat 7. The switch moving contact finger 6 is fixed to the end of the closing section 41 by bolts, and the second clamp is installed at the end of the opening section 42. The second clamp is a crimp clamp. The cooperation of the first clamp 3 and the second clamp enables the flow of the overall current between the same branch conductor and the switch fitting, so that the current of the branch conductor can be switched on and off by the switching fitting. In addition, since the second clamp is installed on the conductive arm 4 and needs to swing with the conductive arm 4, a certain length needs to be left when connecting the conductor to avoid affecting the opening and closing of the conductive arm 4.

[0028] Temperature sensors are also installed at both the first clamp 3 and the second clamp to detect the temperature of the clamping guide. The temperature sensors are designed to detect the temperature of the branch wires clamped at the first clamp 3 and the second clamp, so that the temperature detected by the temperature sensor can be used to determine whether there is an abnormal temperature in the branch wires. This facilitates timely detection of the branch wires and provides a good foundation for the automation of the entire switch fitting.

[0029] The opening and closing operation assembly includes an opening pull ring fitted on the outer wall of the closing section 41 and a closing pull ring fitted on the outer wall of the opening section 42. The closing pull ring includes a closing pull ring body 10, which has a closing pull hole 11. One side of the closing pull ring body 10 is fixed to the outer wall of the opening section 42 by a fixing ring 12, and the fixing ring 12 and the opening section 42 are interference-fitted. The opening pull ring includes an opening pull ring body 9, which has an opening pull hole 91. One side of the opening pull ring body 9 is fixed to the closing section 41 by a fixing rod 92. The closing section 41 has a through hole through which the fixing rod 92 passes, and the fixing rod 92 and the through hole of the closing section 41 are interference-fitted. The fixing rod 92 passes through the through hole of the closing section 41. The design of the opening and closing operation components adopts the cooperation of the opening pull ring and the closing pull ring. It can be used in conjunction with an insulating rod with a hook. The insulating rod is used to pull the opening or closing pull ring, thereby driving the conductive arm 4 to move, so as to realize the on and off of the entire switch hardware. This allows maintenance personnel to disconnect and connect the branch conductors that need to be maintained from below the tower, reducing the maintenance risk for maintenance personnel.

[0030] The closing and opening holding assembly includes a closing holding spring and an opening holding spring.

[0031] The closing holding spring includes a closing spring seat 13 and a pair of closing spring plates mounted on the closing spring seat 13. The closing spring seat 13 is fixed to one side of the bearing seat 7 by bolts, and the closing spring seat 13 and the bearing seat 7 are fixed together on the insulating base 1 by the same bolt, which can reduce the number of bolts used for fixing. Moreover, this design makes the whole structure more compact.

[0032] A gap is left between the two closing spring plates to accommodate the insertion of the closing section 41 of the conductive arm 4. The closing spring plate includes a closing spring post 131. One side of the closing spring post 131 is fixed to the closing spring seat 13, and the other side of the closing spring post 131 is provided with a closing hook 132. The closing hooks 132 of the two closing spring plates are arranged opposite to each other, and the distance between the two closing hooks 132 of the two closing spring plates is smaller than the distance between the two closing spring posts 131.

[0033] The trip holding spring includes a trip spring seat 14 and a pair of trip spring plates mounted on the trip spring seat 14. The trip spring seat 14 is fixed to the other side of the bearing seat by bolts, and the trip spring seat 14 and the bearing seat 7 are fixed together on the insulating base by the same bolts, which can reduce the number of bolts used for fixing. Moreover, this design makes the whole structure more compact.

[0034] A gap is left between the two trip spring plates for the insertion of the trip section 42 of the accommodating conductive arm 4. The trip spring plate includes a trip spring post 141. One side of the trip spring post 141 is fixed to the trip spring seat 14, and the other side of the trip spring post 141 is provided with a trip hook 142. The trip hooks 142 of the two trip spring plates are arranged opposite to each other, and the distance between the two trip hooks 142 of the two trip spring plates is smaller than the distance between the two trip spring posts 141.

[0035] The design of the closing and opening holding assembly uses the cooperation of closing holding spring and opening holding spring to hold the closing section 41 and opening section 42 of the conductive arm 4 in a position-holding function, so that the conductive arm 4 can be held in the closed position or the open position, thereby ensuring that the entire branch conductor can be kept in a de-energized or energized state, which facilitates the maintenance of the branch conductor in the de-energized state or ensures that the branch conductor is kept energized to provide good power supply.

[0036] Pressure sensors are also installed on both the closing and opening spring plates. The design of these pressure sensors utilizes the pressure of the closing spring plate clamping the closing section 41 or the opening spring plate clamping the opening section 42. This allows for manual assessment based on the sensor readings to determine if the closing and opening spring plates have sufficient clamping force to hold the closing section 41 or opening section 42. This is especially important when the entire switchgear is installed inverted, preventing insufficient clamping force from causing the closing section 41 or opening section 42 to disengage, thus avoiding safety hazards. The pressure sensors allow for timely adjustment of the closing and opening spring plates to ensure sufficient clamping force for holding the closing section 41 or opening section 42.

[0037] The working process of the switch-type hardware of the present invention will be described below using a switch-type hardware as an example. Figure 1 As shown, at this time, the trip section 42 of the switch-type hardware is stuck in the trip holding spring, that is, the switch-type hardware is in the trip state. At this time, the branch wire connected to the switch-type hardware is de-energized, and the branch wire can be maintained.

[0038] After maintenance, use the hook at the top of the insulating rod to hook the closing ring and pull it down to disengage the opening section 42 from the opening holding spring. The conductive arm 4 swings down along the hinge point with the bearing seat 7 until the closing section 41 is inserted into the closing position spring. At this time, the moving contact finger 6 at the end of the closing section 41 contacts the stationary contact 5 on the insulating base 1 to achieve engagement and complete the closing. At this time, the switch hardware is in the closed state, and the branch wire connected to the switch hardware is in the energized state, realizing normal power supply.

[0039] The switch-type fitting in this invention achieves the switching of current on and off of branch conductors in transmission lines through the cooperation of an insulating base, a switching assembly, and a cross-line insulator. It can directly achieve the switching of individual branch conductors without needing to de-energize the entire connected main conductor and branch conductors, thus facilitating the maintenance of individual branch conductors.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A switch-type fitting for a power transmission line, the power transmission line comprising a tower and conductors mounted on the tower, the conductors comprising main conductors and branch conductors, characterized in that: Switch-type fittings are installed on branch conductors to control the flow of current in the branch conductors, including... An insulating base having a first surface and a second surface that are oppositely distributed; The first side of the insulating base is fixed to the tower by a cross-line insulator. The second side of the insulating base is provided with a switching assembly. The second side of the insulating base has a first side and a second side that are relatively distributed. A first clamp for fixing the branch conductor is also installed on the first side of the insulating base. The circuit breaker assembly includes a conductive arm, a stationary switch contact, and a moving switch finger. The conductive arm is mounted on the first side of an insulating base via a bearing seat, and the stationary switch contact is mounted on the second side of the insulating base via a contact mounting seat. The conductive arm is V-shaped, with a moving switch finger that mates with the stationary switch contact mounted on one side and a second clamp for fixing the branch conductor mounted on the other side. A circuit breaker operation assembly is also provided on the conductive arm, and a circuit breaker holding assembly that mates with the conductive arm is also provided on the insulating base.

2. The switch fitting for transmission lines according to claim 1, characterized in that: The conductive arm is a V-shaped structure formed by connecting a closing section and a opening section. The connection between the closing section and the opening section is hinged to the bearing seat and swings along the hinge point with the bearing seat. The switch moving contact finger is fixed to the end of the closing section by bolts, and the second wire clamp is installed at the end of the opening section. The opening and closing operation assembly includes an opening pull ring fitted on the outer wall of the closing section and a closing pull ring fitted on the outer wall of the opening section. The closing pull ring includes a closing pull ring body with a closing pull hole. One side of the closing pull ring body is fixed to the outer wall of the opening section by a fixing ring, and the fixing ring and the opening section are interference-fitted. The opening pull ring includes an opening pull ring body with an opening pull hole. One side of the opening pull ring body is fixed to the closing section by a fixing rod. A through hole for the fixing rod to pass through is opened in the closing section, and the fixing rod and the through hole of the closing section are interference-fitted.

3. The switch fitting for transmission lines according to claim 1, characterized in that: The circuit breaker holding assembly includes a closing holding spring and a closing holding spring; The closing holding spring includes a closing spring seat and a pair of closing spring plates mounted on the closing spring seat. The closing spring seat is fixed to one side of the bearing seat by bolts, and the closing spring seat and the bearing seat are fixed together on the insulating base by the same bolt. A gap is left between the two closing spring plates to accommodate the insertion of the conductor arm. Each closing spring plate includes a closing spring post. One side of the closing spring post is fixed to the closing spring seat, and the other side is provided with a closing hook. The closing hooks of the two closing spring plates are arranged opposite to each other, and the distance between the two closing hooks of the two closing spring plates is smaller than the distance between the two closing spring posts. The trip holding spring includes a trip spring seat and a pair of trip spring plates mounted on the trip spring seat. The trip spring seat is fixed to the other side of the bearing seat by bolts, and the trip spring seat and the bearing seat are fixed together to the insulating base by the same bolt. A gap is left between the two trip spring plates to accommodate the insertion of the conductor arm. Each trip spring plate includes a trip spring post, one side of which is fixed to the trip spring seat, and the other side is provided with a trip hook. The trip hooks of the two trip spring plates are arranged opposite to each other, and the distance between the two trip hooks of the two trip spring plates is less than the distance between the two trip spring posts.

4. The switch fitting for transmission lines according to claim 3, characterized in that: Pressure sensors are also installed on both the closing spring sheet and the opening spring sheet.

5. The switch fitting for transmission lines according to claim 1, characterized in that: The first clamp is an assembly clamp, and the second clamp is a crimp clamp.

6. The switch fitting for transmission lines according to claim 1, characterized in that: Both the first and second wire clamps are equipped with temperature sensors for detecting the temperature of the clamping guide.

Images