Handcart type circuit breaker direct current loop resistance tester clamp
By designing a hand-car circuit breaker DC loop resistance tester fixture, multiple conductive poles are used to insert the plum blossom contacts and lock them, the inaccurate measurement and contact damage caused by small contact surfaces in the prior art are solved, and more stable current transmission and longer service life are achieved.
Patent Information
- Application Number
- CN202421887519.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-06
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-08-06
AI Technical Summary
In the prior art, the contact surface of the wire clamp is small and easily damaged when conducting DC loop test, resulting in inaccurate measurement data and easily damage the contact.
A hand-car circuit breaker DC circuit resistance tester clamp is designed, and multiple conductive rods are directly inserted into the plum blossom contact of the circuit breaker to increase the contact area, and lock the conductive rod inside the plum blossom contact through the reaction force of the spring.
By increasing the contact area, the stability of current transmission is improved, the measurement inaccurate problem caused by poor contact is avoided, and the conductive rod is protected through the locking structure, extending the service life.
Smart Images
Figure CN222994537U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of high-voltage switch cabinets for electric power, and particularly relates to a clamp for a direct-current loop resistance tester of a trolley-type circuit breaker. Background Art
[0002] It is necessary to conduct preventive tests on the trolley-type circuit breaker of the high-voltage switch cabinet for electric power every year to prevent accidental power outages caused by poor internal contacts. For the test of the direct-current loop of the circuit breaker, the standard test current is 100 A during the test. Generally, the test is carried out by using a wire clamp to clamp the plum blossom contact of the circuit breaker. The contact of the wire clamp is provided with a spring, and the contact surface between the wire clamp and the plum blossom contact is a point contact surface. The current conduction is poor, the measured data is inaccurate, and once the contact is poor, the current is too large, which easily causes the spring to heat and anneal and lose its elasticity, resulting in damage to the contact. Content of the Utility Model
[0003] In order to solve the problems that the contact surface is small and the contact is easily damaged during the direct-current loop test by the wire clamp in the prior art, the utility model provides a clamp for a direct-current loop resistance tester of a trolley-type circuit breaker.
[0004] The technical solution of the utility model is realized as follows:
[0005] A clamp for a direct-current loop resistance tester of a trolley-type circuit breaker includes: a cylinder body, on which a telescopic pressing handle is arranged, and the pressing handle extends out of the outer periphery of the cylinder body. A supporting plate is fixed at the outer end of the pressing handle. More than two conductive rods connect the supporting plate and the pressing handle. One end of the conductive rod is limited on the supporting plate, and the other end is hinged to the outer periphery of the pressing handle. The pressing handle is in an open state. Compressing the pressing handle drives the conductive rods to tighten around the outer periphery of the pressing handle and extend forward beyond the end of the cylinder body. An electric current input interface electrically connected to the conductive rods is arranged on the supporting plate.
[0006] Preferably, a spring is provided between the inner bottom end of the cylinder body and the pressing handle to enable the pressing handle to telescopically move in the cylinder body. The side wall of the cylinder body is provided with more than two notches, and the outer periphery of the pressing handle is provided with protrusions corresponding to the notches. The protrusions of the pressing handle are stuck at the notches, and move in the notches as the pressing handle telescopically moves, and are stuck at the notches to keep the pressing handle in an open state; the outer periphery of one protrusion is hinged to one conductive rod, enabling the conductive rod to swing back and forth along the axial direction of the cylinder body.
[0007] Preferably, a plurality of radial limiting grooves are arranged on the supporting plate, and one end of each conductive rod is limited in the limiting grooves.
[0008] Preferably, two hinge members are respectively arranged at both ends between the protrusion and the conductive rod. Each hinge member includes two hinge plates and two hinge rods. One hinge rod connects one end of the protrusion and the two hinge plates, and the other hinge rod connects one end of the conductive rod and the two hinge plates.
[0009] Preferably, the material of the support plate is an insulating material, and wires are connected between the pressing handle and the conductive rod, and between the pressing handle and the current input interface.
[0010] The beneficial effects of the present utility model are as follows: For the fixture of the DC loop resistance tester of the handcart type circuit breaker of the present utility model, the conductive rod is the contact end and the locking end of the fixture. Two or more conductive rods are directly inserted into the inside of the plum blossom contact of the circuit breaker, increasing the contact area and improving the stability of current transmission. Moreover, the conductive rod is outwardly expanded under the action of the reaction force of the spring and directly locked inside the plum blossom contact. The structure is simple and convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0012] Figure 1 It is a schematic structural diagram of a fixture of a DC loop resistance tester for a handcart type circuit breaker of the present utility model.
[0013] In the figure:
[0014] 1, cylinder body; 2, pressing handle; 3, spring; 4, support plate; 5, conductive rod; 6, current input interface; 7, hinge; 8, wire; 41, card slot. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.
[0016] Embodiment: As Figure 1The trolley-type circuit breaker DC circuit resistance tester fixture shown comprises: a cylinder 1, a spring 3 is provided between the bottom end of the cylinder 1 and the pressure handle 2 to enable the pressure handle to extend and retract in the cylinder, and the pressure handle 2 expands out of the outer periphery of the cylinder 1, the outer end of the pressure handle 2 is fixed to a support plate 4, and a radial groove 41 is provided on the support plate 4, and more than two conductive rods 5 connect the support plate 4 and the pressure handle 2, one end of each conductive rod 5 is limited on the groove 41 of the support plate 4, and the other end is hinged on the outer periphery of the pressure handle 2, the pressure handle 2 is in an open state, and the compression of the pressure handle 2 drives the conductive rod 5 to tighten around the outer periphery of the pressure handle and extend forward beyond the end of the cylinder, and the support plate 4 is provided with a current input interface 6 conductively connected to the conductive rod.
[0017] The side wall of the cylinder 1 has more than two notches, and the outer periphery of the pressing handle 2 is provided with a convexity corresponding to the notches. The convexity of the pressing handle is stuck in the notch, moves in the notch as the pressing handle 2 is extended and retracted, and is stuck in the notch to keep the pressing handle in an open state; the outer periphery of a convexity is hinged to a conductive rod 5, so that the conductive rod swings back and forth along the axial direction of the cylinder.
[0018] Two hinged parts 7 are respectively arranged at the two ends between the outer protrusion and the conductive rod, each hinged part comprises two hinged plates and two hinged rods, one hinged rod connects one end of the outer protrusion and the two hinged plates, and the other hinged rod connects one end of the conductive rod and the two hinged plates.
[0019] The support plate 4 is made of insulating material, the pressure handle and the conductive rod are conductive, and the current input interface is a through hole on the support plate. A wire 8 is connected between the pressure handle and the conductive rod, and a wire 8 is connected between the pressure handle and the current input interface. The wire is a soft copper strip.
[0020] When in use, the pressure handle is in an open state. The pressure handle is pressed down, one end of each conductive rod slides in the limiting groove of the support plate, and the other end extends forward as the pressure handle is pressed down. The conductive rod is tightened around the outer periphery of the pressure handle and exceeds the end of the cylinder. The extended conductive rod is inserted into the inside of the plum blossom contact of the circuit breaker, and then the pressure handle is released. The conductive rod is expanded and clamped in the plum blossom contact under the action of elastic force, and the current is tested through the current input interface.
[0021] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A trolley type circuit breaker DC loop resistance tester fixture, characterized in that: include: The cylinder body is provided with a retractable pressing handle, and the pressing handle expands out of the outer periphery of the cylinder body, the outer end of the pressing handle is fixed to a support plate, and two or more conductive rods connect the support plate and the pressing handle, one end of the conductive rod is limited on the support plate, and the other end is hinged on the outer periphery of the pressing handle, and the pressing handle is in an open state, and compression of the pressing handle drives the conductive rod to tighten around the outer periphery of the pressing handle and extend forward beyond the end of the cylinder body, and a current input interface conductively connected to the conductive rod is provided on the support plate.
2. The trolley type circuit breaker DC loop resistance tester fixture according to claim 1 is characterized in that: A spring is provided between the bottom end of the cylinder and the pressure handle to enable the pressure handle to extend and retract in the cylinder. The side wall of the cylinder has more than two notches. The outer periphery of the pressure handle is provided with convexities corresponding to the notches. The convexities of the pressure handle are stuck in the notches. As the pressure handle is extended and retracted, it moves in the notches and is stuck in the notches to keep the pressure handle in an open state. The outer periphery of the convexity is hinged to a conductive rod to enable the conductive rod to swing back and forth along the axial direction of the cylinder.
3. The trolley type circuit breaker DC loop resistance tester fixture according to claim 2 is characterized in that: The support plate is provided with a plurality of radial limiting grooves, and one end of each conductive rod is limited in the limiting groove.
4. The trolley type circuit breaker DC loop resistance tester fixture according to claim 2, characterized in that: Two hinged parts are respectively arranged at the two ends between the outer protrusion and the conductive rod, each hinged part comprises two hinged plates and two hinged rods, one hinged rod connects one end of the outer protrusion and the two hinged plates, and the other hinged rod connects one end of the conductive rod and the two hinged plates.
5. The trolley type circuit breaker DC loop resistance tester fixture according to claim 2, characterized in that: The support plate is made of insulating material, a wire is connected between the pressing handle and the conductive rod, and a wire is connected between the pressing handle and the current input interface.