Anti-loosening current transformer secondary cable connection structure

Abstract

The utility model discloses an anti-loose current transformer secondary cable connection structure, which comprises a connection column, a positioning nut and an elastic component, the connection column is arranged on a current transformer shell, the connection column adopts a hollow structure, the positioning nut is arranged in the connection column and is in threaded connection with the connection column, and the elastic component is arranged on the connection column. A cable of the current transformer penetrates through the connecting column, a cold pressing terminal is arranged at the end of the cable, and the elastic component is arranged in the connecting column, located between the positioning nut and the cold pressing terminal of the cable and used for limiting the cold pressing terminal to retreat from the connecting column. According to the anti-loosening current transformer secondary cable connection structure provided by the utility model, the stable connection between the internal cable and the external cable of the current transformer can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of cable or wire connectors, and more specifically, to a current transformer secondary cable connection structure that prevents loosening. Background Art

[0002] Currently, in most engineering applications, the connection between the current transformer body coil and the external secondary cable is completed using bolts, nuts, and circular cold-pressed terminals. The external secondary wire is crimped onto the circular cold-pressed terminal, and the current transformer body coil is connected to the nut and cast together with resin. The circular cold-pressed terminal is connected to the nut through bolts to complete the connection between the current transformer body coil and the external secondary cable. It is strictly prohibited to open the circuit in the operating current transformer secondary circuit, as this can cause electrical faults such as tripping of electrical primary equipment and damage to the current transformer. Therefore, if the connection structure is not firm or stable, it is likely to cause an open circuit in the current transformer secondary circuit.

[0003] The existing solutions have the following disadvantages:

[0004] 1) Loosening of the bolts directly affects the firmness of the wiring and causes the direct resistance of the secondary circuit to be too large. When the current transformer is installed in parts such as the generator body, it is susceptible to vibration, which can easily cause the bolts to loosen.

[0005] 2) The crimping quality of the circular cold-pressed terminal affects the firmness of the wiring. Over-crimping causes cracks in the metal of the crimped part, affecting the connection, while under-crimping results in an insecure connection.

[0006] 3) The wire is stressed and pulled, causing metal fatigue in the circular cold-pressed terminal and resulting in fracture of the cold-pressed terminal. Summary of the Utility Model

[0007] Aiming at the problem of unstable or insecure connection in the existing bolt connection method, the utility model provides a current transformer secondary cable connection structure that prevents loosening, which can achieve a stable connection between the current transformer body coil and the external secondary cable.

[0008] The utility model is achieved through the following technical solutions:

[0009] A current transformer secondary cable connection structure that prevents loosening, comprising a connection column, a positioning nut, and an elastic member. The connection column is disposed on the current transformer housing, and the connection column has a hollow structure. The positioning nut is disposed within the connection column and is threadedly connected to the connection column. The cable of the current transformer passes through the connection column, and the end of the cable has a cold-pressed terminal. The elastic member is disposed within the connection column and is located between the positioning nut and the cold-pressed terminal of the cable, and is used to prevent the cold-pressed terminal from withdrawing from the connection column.

[0010] Optionally, the elastic member is a sheet made of a metal material, and both ends of the sheet have bent portions, and the cold-pressed terminal of the cable can be pressed against the bent portions to elastically support the cold-pressed terminal.

[0011] Optionally, there are 3-6 groups of the elastic members, and the elastic members are arranged at intervals in the circumferential direction.

[0012] Optionally, a disconnection and connection loosening ring is further arranged between the positioning nut and the elastic member. The elastic member is used for elastically abutting against the disconnection and connection loosening ring, and the disconnection and connection loosening ring can be subjected to an external force to escape from the gap between the positioning nut and the cable to disconnect the connecting column.

[0013] Optionally, the positioning nut has an external thread structure and is threadedly connected to the connecting column, and a polygonal structure is adopted in the middle.

[0014] Optionally, the disconnection and connection loosening ring adopts an annular sheet structure.

[0015] Optionally, the positioning nut adopts an internal hexagonal structure.

[0016] The technical solution of the present utility model has at least the following beneficial effects:

[0017] In the anti-loosening secondary cable connection structure of the current transformer of the present utility model, by arranging an elastic member in the hollow connecting column, elastic support for the end of the cable can be maintained. When the cable is stressed and pulled towards the inside of the current transformer, the cold-pressed terminal can be kept in an elastically contacting state, effectively avoiding the risk of metal fatigue and fracture of the cold-pressed terminal. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the anti-loosening secondary cable connection structure of the current transformer of the present utility model;

[0019] Reference numerals: 1-cable, 2-cold-pressed terminal, 3-connecting column, 4-positioning nut, 5-disconnection and connection loosening ring, 6-elastic member, 7-current transformer housing. Detailed Embodiments

[0020] Refer to Figure 1The utility model discloses a connection structure of a secondary cable 1 of a current transformer that is anti-loosening, and is used for connecting a coil of a current transformer body with an external secondary cable 1, and includes a connection column 3, a positioning nut 4, and an elastic component 6. The connection column 3 is arranged on a current transformer housing 7, and can be specifically connected by thread. A screw hole is provided on the current transformer housing 7, and an external thread is provided on the outer surface of the connection column 3, and a threaded connection is achieved with the current transformer housing 7 through the external thread. At the same time, the connection column 3 adopts a hollow structure, and the positioning nut 4 is arranged in the connection column 3 and is threadedly connected with the connection column 3. The positioning nut 4 adopts an external thread structure and is threadedly connected with the connection column 3, and a polygonal structure is adopted in the middle, such as an inner hexagonal structure, so as to be conveniently and quickly positioned in the connection column 3. The cable 1 of the current transformer passes through the connection column 3, and the end of the cable 1 has a cold-pressed terminal 2. The elastic component 6 is arranged in the connection column 3 and is located between the positioning nut 4 and the cold-pressed terminal 2 of the cable 1, and is used to limit the cold-pressed terminal 2 from exiting the connection column 3.

[0021] The elastic component 6 is a sheet-shaped piece made of metal material, and both ends of the sheet-shaped piece have bent parts. The cold-pressed terminal 2 of the cable 1 can be squeezed into the bent part to maintain elastic support for the cold-pressed terminal 2. One bent part of the elastic component 6 is pressed against the cold-pressed terminal 2, and the other bent part can be directly pressed against the positioning nut 4. When the cable 1 tends to withdraw from the interior of the current transformer housing 7, the cold-pressed terminal 2 on the cable 1 directly transfers the pulling force to the elastic component 6. Relying on the squeezing of the bent part of the elastic component 6, the middle part abuts against the cable 1. Through the elastic support of the elastic component 6, the cold-pressed terminal 2 is kept in a state where it cannot withdraw from the connecting column 3, and this connection structure is elastic. In this way, when the cable is externally connected, the entire external cable and the cable 1 in the connecting column 3 are always in an elastic connection state, and there is no risk of breakage due to metal fatigue during fixed connection.

[0022] The elastic components 6 are provided in 3 to 6 groups, and the elastic components 6 are arranged at intervals in the circumferential direction.

[0023] The utility model also provides another embodiment, that is, a detachable wire release ring 5 is further provided between the positioning nut 4 and the elastic component 6, and the elastic component 6 is used to elastically abut against the detachable wire release ring 5, and the detachable wire release ring 5 can be applied with external force to disengage the connecting column 3 from the gap between the positioning nut 4 and the cable 1. The detachable wire release ring 5 adopts an annular sheet structure. By providing the detachable wire release ring 5, it is convenient to insert the detachable wire release ring 5 from the gap of the elastic component 6 through a screwdriver or other tool when the cable 1 needs to be disassembled, and the detachable wire release ring 5 can be squeezed and deformed from the middle gap position of the positioning nut 4, so that it can withdraw from the positioning nut 4 from this position, so that the elastic component 6 loses its limit and elasticity, and the cold-pressed terminal 2 of the cable 1 can be withdrawn from the middle of the elastic component 6, so as to realize the disassembly of the cable 1.

Claims

1. A current transformer secondary cable connection structure that prevents loosening, characterized in that: It includes a connecting column, a positioning nut and an elastic component. The connecting column is arranged on the current transformer housing. The connecting column adopts a hollow structure. The positioning nut is arranged in the connecting column and is threadedly connected to the connecting column. The cable of the current transformer passes through the connecting column, and the cable end has a cold-pressed terminal. The elastic component is arranged in the connecting column and is located between the positioning nut and the cold-pressed terminal of the cable, and is used to limit the cold-pressed terminal from exiting the connecting column.

2. The anti-loosening current transformer secondary cable connection structure according to claim 1, characterized in that: The elastic component is a sheet-shaped piece made of metal material. Both ends of the sheet-shaped piece have bending parts. The cold-pressed terminal of the cable can be pressed onto the bending parts to maintain elastic support for the cold-pressed terminal.

3. The anti-loosening current transformer secondary cable connection structure according to claim 2, characterized in that: The elastic components are provided in 3-6 groups, and the elastic components are arranged at intervals in the circumferential direction.

4. The anti-loosening current transformer secondary cable connection structure according to any one of claims 1 to 3, characterized in that: A detachable wire release ring is also provided between the positioning nut and the elastic component. The elastic component is used to elastically abut against the detachable wire release ring. The detachable wire release ring can be detached from the connecting column from the gap between the positioning nut and the cable by applying external force.

5. The anti-loosening current transformer secondary cable connection structure according to claim 4, characterized in that: The positioning nut is threadedly connected to the connecting column using an external thread structure, and a polygonal structure is used in the middle.

6. The anti-loosening current transformer secondary cable connection structure according to claim 4, characterized in that: The detachable wire loosening ring adopts an annular sheet structure.

7. The anti-loosening current transformer secondary cable connection structure according to claim 5, characterized in that: The positioning nut adopts a hexagonal structure.

Images