A current transformer test device with a vacuum interrupter

Abstract

The present invention discloses a current transformer test device with a vacuum interrupter chamber, which includes an insulating pull rod, a metal bracket, a connecting cylinder body, and a rotating handle. The insulating pull rod includes pull rod a, insulating ceramic, and pull rod b. One end of pull rod a is a threaded connecting rod structure, and the other end is connected to the insulating ceramic. The insulating ceramic is also connected to one end of pull rod b. A pin hole a is provided at the other end of this pull rod b. A pin hole b is provided at one end of the connecting cylinder body. A fixing pin passes through pin hole a and pin hole b to fix pull rod b and the connecting cylinder body; internal threads are provided inside the other end of the connecting cylinder body. The external threaded rod on the rotating handle passes through the metal bracket and engages with the internal threads. The test device of this application is convenient for loading and unloading, isolates the high-voltage end from the grounding end, is easy to manufacture, and effectively improves the test efficiency.

Description

Technical Field

[0001] The present invention relates to a current transformer test device with a vacuum interrupter, and more particularly to a test device for the vacuum interrupter in a current transformer in a switched-off state. Background Art

[0002] Traditional current transformers do not have a vacuum interrupter, so there is no need for closing and opening operations and they can be directly wired for testing.

[0003] The latest current transformers with vacuum interrupters need to perform an opening operation on the vacuum interrupter and conduct a power-on test on the current transformer in the switched-off state. Therefore, there is an urgent need for a test device with adjustable opening distance. Summary of the Invention

[0004] Aiming at the above problems in the prior art, the present application provides a current transformer test device with a vacuum interrupter, which is convenient to load and unload, isolates the high-voltage end from the grounding end, and can accurately adjust the opening distance.

[0005] To achieve the above object, the technical solution of the present application is: a current transformer test device with a vacuum interrupter, including an insulating pull rod, a metal bracket, a connecting cylinder, and a rotating handle. The insulating pull rod includes pull rod a, insulating ceramic, and pull rod b. One end of pull rod a is a threaded connecting rod structure, and the other end is connected to the insulating ceramic. The insulating ceramic is also connected to one end of pull rod b. The other end of pull rod b is provided with pin hole a. One end of the connecting cylinder is provided with pin hole b. A fixing pin passes through pin hole a and pin hole b to fix pull rod b and the connecting cylinder. The other end of the connecting cylinder is internally provided with an internal thread, and the external threaded rod on the rotating handle passes through the metal bracket and engages with the internal thread.

[0006] Further, the pitch of the external threaded rod is designed in different sizes according to needs.

[0007] Further, the metal bracket includes a support ring, a support plate, and a support rod. A plurality of support rods are provided between the support ring and the support plate to make it a structure with a hollow perimeter.

[0008] Further, one end of the connecting cylinder is provided with a blind hole for accommodating pull rod b, and the other end is provided with a threaded hole for accommodating the external threaded rod. The pitch of the threaded hole matches the pitch of the external threaded rod.

[0009] Further, the rotating handle includes a rotating rod, which is connected to the external threaded rod through a cylinder. A support plate is connected to the clamping platform formed between the cylinder and the external threaded rod.

[0010] Due to the adoption of the above technical solutions, the present invention can achieve the following technical effects: The insulating pull rod of this application isolates the high-voltage end from the grounding end on the premise of ensuring strength and conductive effect, ensuring the safety of the grounding end; a connecting cylinder body with a threaded hole is installed at the tail end of the insulating pull rod, and the opening distance of the circuit breaker is precisely adjusted through a metal bracket and a rotating handle. The insulating pull rod after removing the metal bracket and the rotating handle can be used as an installation accessory in the use of a current transformer. The test device of this application is convenient to load and unload, isolates the high-voltage end from the grounding end, is easy to manufacture, effectively improves the test efficiency, and has strong practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic structural diagram of the test device of this application;

[0012] Figure 2 is an external view of the test device of this application;

[0013] Figure 3 is an application diagram of the test device of this application;

[0014] Explanation of the serial numbers in the figure: 1. Pull rod a, 2. Insulating ceramic, 3. Pull rod b, 4. Connecting cylinder body, 5. Fixed pin, 6. Support rod, 7. External threaded rod, 8. Cylinder, 9. Rotating rod, 10. Support plate, 11. Support ring, 12. Moving contact of vacuum interrupter, 13. Flexible connection copper bar, 14. Copper rod, 15. Static contact of vacuum interrupter. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The present invention will be further described in detail below with reference to the drawings and specific embodiments: This example is used to further describe and explain this application.

[0016] Embodiment 1

[0017] As Figure 1-2 shown, this embodiment provides a current transformer test device with a vacuum interrupter, including an insulating pull rod that plays a role in connecting conductors and isolating high voltage, a metal bracket that plays a role in support and guidance, a connecting cylinder body that plays a role in connecting the insulating pull rod and the rotating handle, a rotating handle that plays a role in precisely adjusting the opening distance, and a fixed pin that plays a role in quick disassembly. The insulating pull rod includes pull rod a, insulating ceramic, and pull rod b. Pull rod a is a metal part, one end of which is a threaded connecting rod structure for fixing the moving contact of the vacuum interrupter and the flexible connection copper bar, and the other end is buried in the head of the insulating ceramic. Pull rod b is a metal part, one end of which is buried in the tail of the insulating ceramic, and the other end is provided with pin hole a. One end of the connecting cylinder body is provided with pin hole b, and the fixed pin passes through pin hole a and pin hole b to fix pull rod b and the connecting cylinder body; the other end of the connecting cylinder body is internally provided with internal threads, and the external threaded rod on the rotating handle passes through the metal bracket and engages with the internal threads.

[0018] The metal bracket includes a support ring, a support plate, and support rods. The support plate is provided with through holes for the outer threaded rods to pass through. A plurality of support rods are provided between the support ring and the support plate to form a structure with a hollow perimeter, facilitating disassembly operations.

[0019] The rotating handle includes a rotating rod, which is connected to the outer threaded rod through a cylinder. A support plate is connected to the clamping platform formed between the cylinder and the outer threaded rod.

[0020] One end of the connecting cylinder body is provided with a blind hole for accommodating the pull rod b, and the other end is provided with a threaded hole for accommodating the outer threaded rod. The pitch of the threaded hole matches the pitch of the outer threaded rod. The pitch on the outer threaded rod is designed in different sizes according to needs. For example, when the vacuum interrupter needs to be pulled apart by 9 mm, the pitch of the outer threaded rod on the rotating handle can be designed to be 1.5 mm. That is, when the rotating handle rotates one week, it moves 1.5 mm along the threaded direction. Only by rotating 6 weeks can the vacuum interrupter be pulled apart by 9 mm.

[0021] The assembly method of the test device is as follows: The tail end of the pull rod b of the insulating pull rod is inserted into the blind hole of the connecting cylinder body, and a fixing pin is used to penetrate the pin holes of the pull rod b and the connecting cylinder body to fix the two as a whole; the outer threaded rod on the rotating handle passes through the through hole of the support plate and is screwed into the threaded hole at the tail end of the connecting cylinder body.

[0022] As Figure 3 shown, the figure shows a simplified schematic diagram of a current transformer with a vacuum interrupter. Details irrelevant to this application are omitted; among them, the moving contact of the vacuum interrupter and the static contact of the vacuum interrupter are internal components of the vacuum interrupter and are in contact and conducting under the closing condition. The copper rod is a copper conductive rod. The flexible connecting copper bus can move within a certain range. The flexible connecting copper bus is used to lap the copper rod and the moving contact of the vacuum interrupter. The threaded connecting rod structure of the pull rod a fixes the flexible connecting copper bus and the moving contact of the vacuum interrupter, and the metal bracket is supported outside the current transformer. By rotating the handle, the outer threaded rod is screwed into the threaded hole of the connecting cylinder body, and the insulating pull rod, the connecting cylinder body, the fixing pin, and the moving contact of the vacuum interrupter are all pulled out of the current transformer; by adjusting the number of turns of the outer threaded rod rotation, the distance between the moving contact of the vacuum interrupter and the static contact of the vacuum interrupter can be adjusted. When adjusted to the appropriate distance, the copper rod is energized with high voltage, and at this time, the static contact of the vacuum interrupter and the rotating handle are both de-energized.

[0023] The purpose of this application is to provide a current transformer test device with a vacuum interrupter to solve the problem of how to test the current transformer in the open state of the vacuum interrupter, and its practicability is very strong.

[0024] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. A current transformer test device with a vacuum interrupter, characterized in that, it includes an insulating pull rod, a metal bracket, a connecting cylinder body, and a rotating handle. The insulating pull rod includes pull rod a, insulating ceramics, and pull rod b. One end of pull rod a is a threaded connecting rod structure, and the other end is connected to the insulating ceramics. The insulating ceramics are also connected to one end of pull rod b. A pin hole a is provided at the other end of this pull rod b. A pin hole b is provided at one end of the connecting cylinder body. A fixing pin passes through pin hole a and pin hole b to fix pull rod b and the connecting cylinder body; internal threads are provided inside the other end of the connecting cylinder body. The external threaded rod on the rotating handle passes through the metal bracket and engages with the internal threads; the pitch on the external threaded rod is designed to be of different sizes according to requirements; the metal bracket includes a support ring, a support plate, and support rods. A plurality of support rods are provided between the support ring and the support plate to make it a structure with a hollow perimeter; one end of the connecting cylinder body is provided with a blind hole for accommodating pull rod b, and the other end is provided with a threaded hole for accommodating the external threaded rod. The pitch of the threaded hole matches the pitch of the external threaded rod.

2. The current transformer test device with a vacuum interrupter according to claim 1, characterized in that, the rotating handle includes a rotating rod, and the rotating rod is connected to the external threaded rod through a cylinder. A support plate is connected at the position of the clamping platform formed between the cylinder and the external threaded rod.

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