Electromagnetic operating mechanism with breaking middle section buffer and method of using same
By designing an electromagnetic operating mechanism with a mid-section buffer for tripping, and utilizing the coordination of the tripping repulsion coil, the mid-section buffer coil, and the closing repulsion coil, the movement of the moving rod is controlled by reverse pulse current, thus solving the problem of unstable movement characteristics of the moving contact during the tripping process of the high-voltage circuit breaker and achieving stable control of the electric arc.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
- Filing Date
- 2022-11-07
- Publication Date
- 2026-07-24
AI Technical Summary
Existing technologies make it difficult to achieve the motion characteristics of deceleration in the middle stage and acceleration in the later stage of the opening of high-voltage circuit breakers, resulting in unstable arc control.
An electromagnetic operating mechanism with a mid-stage buffer for opening is adopted. Through the design of the electromagnetic control mechanism, the movement of the moving guide rod is controlled by the cooperation of the opening repulsion coil, the mid-stage buffer coil and the closing repulsion coil, and the reverse pulse current is used to achieve deceleration in the mid-stage of opening and acceleration in the later stage.
It achieves stable movement characteristics of the moving contact during the opening process, ensuring appropriate longitudinal magnetic field strength and stable arc morphology, and meeting the high current breaking requirements of high-voltage circuit breakers.
Smart Images
Figure CN115565815B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of high-voltage circuit breaker technology, specifically to an electromagnetic operating mechanism with a tripping buffer and its usage method. Background Technology
[0002] Vacuum circuit breakers are a type of circuit breaker that uses vacuum as the arc-extinguishing medium and the insulating medium between the contacts after arc extinguishing. During the opening process, a longitudinal magnetic field generated by the current flowing through the special structure of the contacts is often used to control the arc in order to successfully interrupt the current.
[0003] Compared to medium and low voltage vacuum circuit breakers, high voltage circuit breakers are characterized by a large contact opening distance. Therefore, the high current breaking in high voltage vacuum circuit breakers places the following requirements on the contact movement: In the initial stage of opening, a sufficiently fast opening speed is desired to meet the necessary electrode opening distance under short-arc conditions to withstand overvoltage after the arc crosses zero; in the middle stage of opening, a slow opening speed is desired to ensure sufficient longitudinal magnetic field strength to control the arc morphology stability; and in the later stage of the arc current crossing zero, a sufficiently fast opening speed is desired to allow the contacts to quickly open to the rated opening distance to ensure sufficient insulation strength. Acceleration in the initial stage of opening is relatively easy to achieve, but there is currently no structure that can effectively achieve the buffering characteristics in the middle stage of opening and the acceleration characteristics in the later stage of opening. Summary of the Invention
[0004] To address the technical problems existing in the prior art, the purpose of this invention is to provide an electromagnetic operating mechanism with a mid-stage buffer for realizing the motion characteristics of deceleration and acceleration of the moving contact during the opening process of a circuit breaker, and its usage method.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] An electromagnetic operating mechanism with a mid-section buffer for tripping is disclosed. This mechanism is used in high-voltage vacuum circuit breakers. The electromagnetic operating mechanism includes a tripping repulsion coil, a mid-section buffer coil, a closing repulsion coil, a repulsion disk, a moving guide rod, a closing limit switch, a tripping limit switch, and a frame. The moving guide rod extends into the frame from one end and is slidably connected to the frame. The repulsion disk is fixedly connected to the moving guide rod and is located within the frame. The closing limit switch is fixed within the frame, fitted over the moving guide rod, and positioned above the repulsion disk. The tripping limit switch is fixed within the frame and positioned below the repulsion disk. The tripping repulsion coil is installed within the frame and fitted over the tripping limit switch. The mid-section buffer coil is fixed to the side wall of the frame and is located within the movement area of the mid-section of the moving guide rod during tripping.
[0007] As a preferred embodiment, an electromagnetic operating mechanism with a mid-section buffer for tripping also includes a moving coil, which is fixed to the outside of the repulsion disk.
[0008] As a preferred option, the repulsion disk is made of a non-magnetic material with high conductivity.
[0009] As a preferred embodiment, the tripping repulsion coil, the intermediate buffer coil, and the moving coil are single-layer or multi-layer coil structures, and are formed by winding copper or aluminum wire.
[0010] As a preferred embodiment, the outer diameter of the moving coil is the same as the outer diameter of the opening repulsion coil.
[0011] As a preferred embodiment, the closing limit switch is bonded to the frame or connected by screws, and the opening limit switch is bonded to the frame or connected by screws.
[0012] As a preferred embodiment, the opening repulsion coil, the intermediate buffer coil, the closing repulsion coil, and the moving coil are each individually connected to a capacitor bank for power supply.
[0013] As a preferred option, the discharge of the capacitor bank is controlled by power semiconductor devices or spherical gaps.
[0014] A method for using an electromagnetic operating mechanism with a mid-stage tripping buffer includes the following steps:
[0015] S1: In the initial stage of tripping, a reverse pulse current is applied to the tripping repulsion coil to induce eddy currents between the tripping repulsion coil and the repulsion disk, generating repulsion force and accelerating the moving guide rod.
[0016] S2: In the middle section of the circuit breaker tripping, a reverse pulse current is applied to the middle section buffer coil to induce eddy currents between the middle section buffer coil and the repulsion disk, generating a repulsive force that slows down the moving guide rod. After the arc current crosses zero, a reverse pulse current is applied to the middle section buffer coil again to accelerate the moving guide rod to the rated opening distance.
[0017] S3: At the end of the opening phase, a reverse pulse current is applied to the closing repulsion coil. The closing repulsion coil and the repulsion disk induce eddy currents to generate repulsion force, which slows down the moving guide rod.
[0018] As a preferred embodiment, a moving coil is added in steps S1, S2, and S3.
[0019] In step S1, a reverse pulse current is applied to the tripping repulsion coil and the moving coil, which generate electromagnetic repulsion between them, causing the moving guide rod to accelerate.
[0020] In step S2, a reverse pulse current is applied to the middle section buffer coil and the moving coil, which generate electromagnetic repulsion between them, causing the moving guide rod to decelerate; after the arc current crosses zero and the moving coil passes through the plane where the middle section buffer coil is located, a reverse pulse current is applied again, causing the moving guide rod to accelerate to the rated opening distance.
[0021] In step S3, a reverse pulse current is applied to the closing repulsion coil and the moving coil, causing them to generate electromagnetic repulsion between them, and the moving guide rod decelerates.
[0022] In summary, the present invention has the following advantages:
[0023] 1. The present invention can decelerate the moving contact in the middle of the opening process to ensure that the longitudinal magnetic field strength is large enough to control the electric arc.
[0024] 2. This invention can accelerate the moving contact after the current crosses zero during the opening process, so as to meet the special requirements of the high current breaking of the high-voltage circuit breaker on the movement of the moving contact. Attached Figure Description
[0025] Figure 1 A schematic diagram of an electromagnetic operating mechanism with a mid-section buffer for tripping when in the tripped position;
[0026] 1 is the tripping repulsion coil, 2 is the intermediate buffer coil, 3 is the closing repulsion coil, 4 is the moving coil, 5 is the repulsion plate, 6 is the moving guide rod, 7 is the closing limit switch, 8 is the tripping limit switch, and 9 is the frame. Detailed Implementation
[0027] The present invention will now be described in further detail with reference to specific embodiments.
[0028] Example 1
[0029] like Figure 1 As shown, an electromagnetic operating mechanism with a mid-section buffer for tripping is used in a high-voltage vacuum circuit breaker. The electromagnetic operating mechanism includes a tripping repulsion coil, a mid-section buffer coil, a closing repulsion coil, a repulsion disk, a moving guide rod, a closing limit switch, a tripping limit switch, and a frame. The moving guide rod extends into the frame from one end and is slidably connected to the frame. The repulsion disk is fixedly connected to the moving guide rod and is located inside the frame. The closing limit switch is fixed inside the frame, sleeved on the outside of the moving guide rod, and located above the repulsion disk. The tripping limit switch is fixed inside the frame and located below the repulsion disk. The tripping repulsion coil is installed inside the frame and sleeved on the outside of the tripping limit switch. The mid-section buffer coil is fixed on the side wall of the frame and is located in the movement area of the mid-section of the tripping section of the moving guide rod. In this embodiment, the axial installation position of the intermediate buffer coil is determined according to the requirements of the circuit breaker's tripping motion characteristics. This is because different levels of circuit breakers have different stroke curve requirements. Therefore, the position of the intermediate buffer is determined based on the motion characteristics. The optimal installation position is the plane where the repulsion disk is located at the moment when the arc current crosses zero during the tripping process.
[0030] An electromagnetic operating mechanism with a mid-section buffer for tripping also includes a moving coil, which is fixed to the outside of the repulsion disk.
[0031] The repulsion disk is made of non-magnetic materials with high electrical conductivity, such as aluminum, which can generate larger eddy currents and thus provide a larger electromagnetic repulsion force to drive the opening and closing of the circuit breaker.
[0032] The tripping repulsion coil, the intermediate buffer coil, and the moving coil are single-layer or multi-layer coil structures, and are formed by winding copper or aluminum wire.
[0033] The outer diameter of the moving coil is the same as the outer diameter of the opening / closing repulsion coil. Since the electromagnetic repulsion between the repulsion plate and the moving coil is the largest when they are the same size as the opening / closing repulsion coil, the electromagnetic repulsion driving efficiency reaches a relatively optimal value at this time. Therefore, the outer diameters of the moving coil, the opening repulsion coil, and the closing repulsion coil are the same.
[0034] The closing limit switch is glued or screwed to the frame, and the opening limit switch is glued or screwed to the frame.
[0035] The opening repulsion coil, intermediate buffer coil, closing repulsion coil, and moving coil are each individually connected to a capacitor bank for power supply.
[0036] The discharge of the capacitor bank is controlled by power semiconductor devices or spherical gaps.
[0037] A method for using an electromagnetic operating mechanism with a mid-stage buffer for tripping, comprising employing an electromagnetic operating mechanism with a mid-stage buffer for tripping.
[0038] The specific usage method is as follows: Figure 1 The image shows the closed state of the electromagnetic operating mechanism with a tripping buffer used in a high-voltage vacuum circuit breaker.
[0039] S1: When the tripping operation begins, a reverse pulse current is applied to the tripping repulsion coil and the moving coil, which generate electromagnetic repulsion between them, causing the moving rod to drive the moving contact to accelerate.
[0040] S2: In the initial stage of opening, the repulsion plate and the moving coil are located diagonally above the intermediate buffer coil. When the moving coil reaches the preset position during the opening process, the moving coil and the intermediate buffer coil are connected to a reverse pulse current, generating a reverse magnetic flux. At this time, the repulsion plate and the moving coil are still located above the intermediate buffer coil, and the two generate electromagnetic repulsion. Therefore, the repulsion plate decelerates before passing the intermediate buffer coil, achieving the effect of buffering the opening movement of the contacts.
[0041] After the repulsion disk and the moving coil pass through the middle section buffer coil, the repulsion disk and the moving coil are located diagonally below the middle section buffer coil. Similarly, the two coils generate reverse magnetic flux through reverse pulse current, thereby generating electromagnetic repulsion and achieving the effect of accelerating the opening of the moving contact.
[0042] S3: At the end of the opening phase, the moving coil approaches the closing repulsion coil from above. The two generate electromagnetic repulsion between them through reverse pulse currents, and the moving guide rod drives the moving contact to decelerate.
[0043] Example 2
[0044] In this embodiment, a moving coil is added to steps S1, S2, and S3 of the usage method in Embodiment 1.
[0045] In step S1, a reverse pulse current is applied to the tripping repulsion coil and the moving coil, which generate electromagnetic repulsion between them, causing the moving guide rod to accelerate.
[0046] In step S2, a reverse pulse current is applied to the middle section buffer coil and the moving coil, which generate electromagnetic repulsion between them, causing the moving guide rod to decelerate; after the arc current crosses zero and the moving coil passes through the plane where the middle section buffer coil is located, a reverse pulse current is applied again, causing the moving guide rod to accelerate to the rated opening distance.
[0047] In step S3, a reverse pulse current is applied to the closing repulsion coil and the moving coil, causing them to generate electromagnetic repulsion between them, and the moving guide rod decelerates.
[0048] The parts not mentioned in this embodiment are the same as in Embodiment 1.
[0049] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.
Claims
1. A method of using an electromagnetic operating mechanism with a mid-section buffer for tripping, characterized in that: An electromagnetic operating mechanism with a mid-section buffer for tripping is used in a high-voltage vacuum circuit breaker. The electromagnetic operating mechanism includes a tripping repulsion coil, a mid-section buffer coil, a closing repulsion coil, a repulsion disk, a moving guide rod, a closing limit switch, a tripping limit switch, and a frame. The moving guide rod extends into the frame from one end and is slidably connected to the frame. The repulsion disk is fixedly connected to the moving guide rod and is located inside the frame. The closing limit switch is fixed inside the frame, sleeved on the outside of the moving guide rod, and located above the repulsion disk. The tripping limit switch is fixed inside the frame and located below the repulsion disk. The tripping repulsion coil is installed inside the frame and sleeved on the outside of the tripping limit switch. The mid-section buffer coil is fixed to the side wall of the frame and is located in the movement area of the middle section of the tripping moving guide rod. The usage method includes the following steps. S1: In the initial stage of tripping, a reverse pulse current is applied to the tripping repulsion coil to induce eddy currents between the tripping repulsion coil and the repulsion disk, generating repulsion force and accelerating the moving guide rod. S2: In the middle section of the circuit breaker tripping, a reverse pulse current is applied to the middle section buffer coil to induce eddy currents between the middle section buffer coil and the repulsion disk, generating a repulsive force that slows down the moving guide rod. After the arc current crosses zero, a reverse pulse current is applied to the middle section buffer coil again to accelerate the moving guide rod to the rated opening distance. S3: At the end of the opening phase, a reverse pulse current is applied to the closing repulsion coil. The closing repulsion coil and the repulsion disk induce eddy currents to generate repulsion force, which slows down the moving guide rod.
2. The method of using the electromagnetic operating mechanism with a mid-section buffer for tripping according to claim 1, characterized in that: It also includes a moving coil, which is fixed to the outside of the repulsion disk.
3. The method of using the electromagnetic operating mechanism with a mid-section buffer for tripping according to claim 1, characterized in that: The repulsion disk is made of non-magnetic material.
4. The method of using the electromagnetic operating mechanism with a mid-section buffer for tripping according to claim 2, characterized in that: The tripping repulsion coil, the intermediate buffer coil, and the moving coil are single-layer or multi-layer coil structures, and are formed by winding copper or aluminum wire.
5. The method of using the electromagnetic operating mechanism with a mid-section buffer for tripping according to claim 2, characterized in that: The outer diameter of the moving coil is the same as the outer diameter of the opening repulsion coil.
6. The method of using the electromagnetic operating mechanism with a tripping middle buffer as described in claim 1, characterized in that: The closing limit switch is glued or screwed to the frame, and the opening limit switch is glued or screwed to the frame.
7. The method of using the electromagnetic operating mechanism with a mid-section buffer for tripping according to claim 2, characterized in that: The opening repulsion coil, intermediate buffer coil, closing repulsion coil, and moving coil are each individually connected to a capacitor bank for power supply.
8. The method of using the electromagnetic operating mechanism with a mid-section buffer for tripping according to claim 7, characterized in that: The discharge of the capacitor bank is controlled by power semiconductor devices or spherical gaps.
9. The method of using the electromagnetic operating mechanism with a tripping middle section buffer according to claim 1, characterized in that: A moving coil is added in steps S1, S2, and S3. In step S1, a reverse pulse current is applied to the tripping repulsion coil and the moving coil, which generate electromagnetic repulsion between them, causing the moving guide rod to accelerate. In step S2, a reverse pulse current is applied to the middle section buffer coil and the moving coil, which generate electromagnetic repulsion between them, causing the moving guide rod to decelerate; after the arc current crosses zero and the moving coil passes through the plane where the middle section buffer coil is located, a reverse pulse current is applied again, causing the moving guide rod to accelerate to the rated opening distance. In step S3, a reverse pulse current is applied to the closing repulsion coil and the moving coil, causing them to generate electromagnetic repulsion between them, and the moving guide rod decelerates.