A double eddy current driven fast switch with electromagnetic anti-bounce

Abstract

The present invention discloses a double-eddy-current driven fast switch with electromagnetic anti-bounce, comprising a vacuum interrupter, a guide rod, a permanent magnetic holding mechanism, a closing bounce suppression mechanism, a double-eddy-current driving mechanism, a frame, a plurality of electronic switches, a plurality of bounce suppression capacitors and a plurality of energy storage capacitors. The top of the guide rod is placed in the vacuum interrupter, and the guide rod extends downward to the permanent magnetic holding mechanism. The permanent magnetic holding mechanism comprises an upper closing magnet metal steel plate frame, a lower opening magnet metal steel plate frame and a moving soft iron therebetween. The upper closing magnet metal steel plate frame is embedded with an upper closing magnet; the lower opening magnet metal steel plate frame is embedded with a lower opening magnet. The present invention adopts an actuator based on a double-eddy-current drive with electromagnetic anti-bounce, which has a faster closing and opening speed, better bounce suppression performance, and greatly improves the comprehensive performance of the power protection switch equipment. The equipment has a compact structure, high reliability, strong stability, and can adapt to various working conditions.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage, high-current, and strong-electricity switches, in particular to a double-eddy-current driven fast switch with electromagnetic anti-bounce function. Background Art

[0002] With the development and progress of society, global electricity generation and consumption are increasing annually, placing higher demands on the safety of power generation and consumption equipment. To protect sensitive equipment (generators, inverters, motors, etc.) at both power generators and consumers, power supply and distribution systems must be able to quickly disconnect in the event of a fault. Existing traditional switches are unable to meet the demands of the current power market. Therefore, to address this significant power consumption challenge, dual-eddy-current driven, fast-acting switches with electromagnetic anti-bounce technology have emerged.

[0003] Commonly used eddy-current-driven fast-acting power switches rely primarily on a single eddy-current disk to drive the mechanism. This drawback is the difficulty in controlling the initial velocity of the mechanism. Low initial velocity results in slow opening and closing speeds, reduced breaking capacity, and reduced switch performance. High initial velocity can cause significant bounce in the vacuum circuit breaker during closing, increasing electrical wear on the arc extinguishing chamber and shortening the breaker's service life. Our company has developed a new fast-acting switch that utilizes a dual eddy-current drive mechanism. This not only increases the initial velocity but also uses electromagnetic repulsion at the end of the closing motion to reduce the final velocity, completely suppressing closing bounce. Summary of the Invention

[0004] The object of the present invention is to provide a double eddy current driven fast switch with electromagnetic anti-bounce function to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A double eddy current driven fast switch with electromagnetic anti-bounce, comprising a vacuum interrupter, a guide rod, a permanent magnetic holding mechanism, a closing bounce suppression mechanism, a double eddy current drive mechanism, a frame, several electronic switches, several bounce suppression capacitors and several energy storage capacitors;

[0007] The top of the guide rod is placed in the vacuum interrupter, and the guide rod extends downward to the permanent magnetic holding mechanism, which includes an upper closing magnet metal steel plate frame, a lower opening magnet metal steel plate frame, and a moving soft iron therebetween. The upper closing magnet is embedded in the upper closing magnet metal steel plate frame, and the lower opening magnet is embedded in the lower opening magnet metal steel plate frame.

[0008] The closing bounce suppression mechanism is placed below the permanent magnetic holding mechanism and connected to the guide rod. The closing bounce suppression mechanism includes a single coil support structure and a closing bounce suppression coil; the closing bounce suppression coil is installed on the single coil support structure, and the coil support structure is fixedly connected to the frame.

[0009] The dual eddy current drive mechanism is placed below the closing bounce suppression mechanism and connected to the guide rod. The dual eddy current drive mechanism includes an upper closing aluminum disk, a closing coil, a double coil support structure, an opening coil and a lower opening aluminum disk. The closing coil and the opening coil are both installed on the double coil support structure, and the double coil support structure is fixed to the frame.

[0010] The single-coil support structure and the double-coil support structure are both support steel plates, and the double-coil support structure has a hollow structure in the middle.

[0011] As a preferred embodiment of the present invention: the closing bounce suppression coil is connected to an upper bounce suppression capacitor, and a third electronic switch is connected between the closing bounce suppression coil and the upper bounce suppression capacitor; the closing coil, the opening coil and the double-coil support structure are arranged in a group, the closing coil is connected to a closing energy storage capacitor, and a second electronic switch is connected between the closing coil and the closing energy storage capacitor, the opening coil is connected to the opening energy storage capacitor and the lower bounce suppression capacitor, the opening coil is connected to a first electronic switch between the opening coil and the opening energy storage capacitor, and a fourth electronic switch is connected between the opening coil and the lower bounce suppression capacitor.

[0012] As a further preferred solution of the present invention: the closing bounce suppression mechanism is composed of an opening coil and a lower opening aluminum disk.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1) The closing bounce suppression mechanism is adopted to completely solve the closing bounce problem, reduce the electrical wear of the arc extinguishing chamber contacts in the circuit breaker, and extend the electrical life of the circuit breaker.

[0014] 2) The dual-eddy current drive mechanism can use any triggering mode, such as single-coil discharge, dual-coil discharge, or triple-coil discharge, depending on the actual situation. The single-coil mode triggers only the opening coil or the closing coil during opening and closing. When using the dual-coil enhanced discharge mode, the supporting steel plate can be hollowed out to allow more magnetic flux to penetrate the hollowed-out area of ​​the steel plate. Furthermore, the pulse magnetic field directions of the closing and opening coils must be aligned, significantly strengthening the pulse magnetic field and greatly improving closing and opening speeds.

[0015] 3) In situations where the short-circuit current exceeds the standard, in order to obtain a faster opening speed and thus increase the breaking capacity, a three-coil super-strong discharge mode can also be selected. At the initial stage of opening, not only the opening and closing coils are discharged, but also the bounce suppression coil is discharged, thereby generating induced eddy current repulsion on the upper and lower aluminum plates. The superposition of the same-direction repulsive forces drives the guide rod to accelerate downward, greatly accelerating its opening speed.

[0016] The present invention adopts an actuator based on dual eddy current drive with electromagnetic anti-bounce, which has faster opening and closing speed, better bounce suppression performance, and greatly improves the comprehensive performance of the power protection switch equipment. The equipment has a compact structure, high reliability, strong stability, and can adapt to various working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present invention.

[0018] Figure 2 It is a schematic diagram of the structure of the closing bounce suppression mechanism and each layer of discharge coils in the present invention.

[0019] Figure 3 Schematic diagram of the hollow structure of the supporting steel plate in the present invention.

[0020] Figure 4 This is a control logic flow chart of the present invention.

[0021] Figure 5 This is a schematic diagram of the specific structure of Example 2 of the present invention.

[0022] In the figure, 1-vacuum interrupter, 2-guide rod, 3-upper closing magnet metal steel plate frame, 4-upper closing magnet, 5-moving soft iron, 6-lower opening magnet, 7-lower opening magnet metal steel plate frame, 8-single coil support structure, 9-closing bounce suppression coil, 10-upper closing aluminum disk, 11-closing coil, 12-double coil support structure, 13-opening coil, 14-lower opening aluminum disk, 15-frame, 16-opening energy storage capacitor, 17-first electronic switch, 18-closing energy storage capacitor, 19-second electronic switch, 20-upper bounce suppression capacitor, 21-third electronic switch, 22-lower bounce suppression capacitor, 23-fourth electronic switch. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "single," "double," "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0026] Example 1:

[0027] See also Figure 1-4 In an embodiment of the present invention, a dual-eddy-current driven fast switch with electromagnetic anti-bounce type includes a vacuum interrupter 1, a guide rod 2, a permanent magnetic holding mechanism, a closing bounce suppression mechanism, a dual-eddy-current driving mechanism, a frame 15, a plurality of electronic switches, a plurality of bounce suppression capacitors and a plurality of energy storage capacitors;

[0028] The top of the guide rod 2 is placed on the vacuum interrupter 1, and the guide rod 2 extends downward to the permanent magnetic holding mechanism. The permanent magnetic holding mechanism includes an upper closing magnet metal steel plate frame 3, a lower opening magnet metal steel plate frame 7, and a moving soft iron 5 therebetween. The upper closing magnet metal steel plate frame 3 is embedded with an upper closing magnet 4, and the lower opening magnet metal steel plate frame 7 is embedded with a lower opening magnet 6.

[0029] The closing bounce suppression mechanism is placed below the permanent magnetic holding mechanism and connected to the guide rod 2. The closing bounce suppression mechanism includes a single coil support structure 8 and a closing bounce suppression coil 9; the closing bounce suppression coil 9 is installed on the single coil support structure 8, and the coil support structure is fixedly connected to the frame 15.

[0030] The dual eddy current drive mechanism is placed below the closing bounce suppression mechanism and connected to the guide rod 2. The dual eddy current drive mechanism includes an upper closing aluminum disk 10, a closing coil 11, a double coil support structure 12, an opening coil 13 and a lower opening aluminum disk. The closing coil 11 and the opening coil 13 are both installed on the double coil support structure 12, and the double coil support structure 12 is fixed to the frame 15.

[0031] The single-coil support structure 8 and the double-coil support structure 12 are both support steel plates, and the double-coil support structure 12 has a hollow structure in the middle.

[0032] Specifically, the closing bounce suppression coil 9 is connected to the upper bounce suppression capacitor 20, and a third electronic switch 21 is connected between the closing bounce suppression coil 9 and the upper bounce suppression capacitor 20; the closing coil 11, the opening coil 13 and the double-coil support structure 12 are arranged in a group, the closing coil 11 is connected to the closing energy storage capacitor 18, and a second electronic switch 19 is connected between the closing coil 11 and the closing energy storage capacitor 18, the opening coil 13 is connected to the opening energy storage capacitor 16 and the lower bounce suppression capacitor 22, the opening coil 13 and the opening energy storage capacitor 16 are connected to the first electronic switch 17, and the opening coil 13 and the lower bounce suppression capacitor 22 are connected to the fourth electronic switch 23.

[0033] When the opening and closing coil discharges, if the speed of pushing the opening and closing aluminum disk is fast enough, a single-coil discharge mode can be considered to achieve opening and closing; when the single-coil mode cannot meet the opening and closing speed requirements, in order to speed up the opening and closing speed, a double-coil enhanced discharge mode can be adopted, and the double-coil support structure 12 can be hollowed out at the same time, so that more magnetic flux can penetrate the hollow area of ​​the steel plate, and the pulse magnetic field directions of the opening coil and the closing coil must be consistent; based on the above design, the opening and closing speed can be greatly improved.

[0034] The closing bounce suppression mechanism can be flexibly increased or decreased according to actual conditions; when the bounce generated by the closing mechanism is large, a bounce suppression mechanism can be added to suppress the closing bounce; when the bounce generated by the closing mechanism is small, the closing bounce suppression mechanism can be cancelled to meet customer needs, thereby reducing the overall cost of the equipment.

[0035] See Figure 4When the circuit breaker receives a closing signal, the system detects whether the dual-coil enhanced discharge mode is required. If not, the single-coil discharge mode is used to discharge the closing coil directly. If the dual-coil enhanced discharge mode is required, the system will delay for a certain period of time (about 5-10ms) after the discharge of the opening and closing coils is completed, and then discharge the bounce suppression coil. The purpose of the delayed discharge is to ensure that when the moving contact in the arc extinguishing chamber is at the end of closing, the closing aluminum disk is about to contact the bounce suppression coil, and the magnetic field strength of the bounce suppression coil is on the rising edge, the closing aluminum disk will generate a repulsive force to suppress bounce.

[0036] When the circuit breaker receives the trip signal, when the trip coil 13 discharges, and the speed of pushing the trip aluminum disk is fast enough, the single-coil discharge mode can be considered to achieve tripping; when the single-coil tripping cannot meet the tripping speed requirement; in order to speed up the tripping speed, the double-coil enhanced discharge mode can be adopted, and the closing coil and the tripping coil are discharged at the same time. At this time, the trip eddy current disk will induce a larger eddy current repulsion, thereby accelerating its tripping speed; in cases where the short-circuit current exceeds the standard, in order to obtain a faster tripping speed and thus increase the breaking capacity, the three-coil super-strong discharge mode can also be selected. At the initial stage of tripping, not only the closing and closing coils are discharged, but also the bounce suppression coil is discharged, so as to generate induced eddy current repulsion on the upper and lower aluminum disks together, and the same-direction repulsion is superimposed, driving the guide rod 2 to accelerate downward movement, greatly accelerating its tripping speed.

[0037] Furthermore, specific parameters such as the number of internal permanent magnets of the permanent magnetic holding mechanism, closing bounce suppression mechanism, and dual eddy current drive mechanism, the number and size of coil turns in each layer, the size and timing of the discharge current can be calculated and adjusted according to the levels of the system's rated voltage and rated current; the closing and opening times are completed within a few milliseconds respectively.

[0038] Example 2:

[0039] See Figure 5 Based on Example 1, the closing bounce suppression mechanism consists of a tripping coil 13 and a lower tripping aluminum disk 14. In the single-coil discharge mode, when the closing coil discharges, the upper closing aluminum disk 10 drives the entire system to operate. After a delay of a certain time (about 5-10ms), the tripping coil is discharged through the lower bounce suppression capacitor. At this time, the tripping aluminum disk will generate a downward force to suppress closing bounce; at this time, the lower bounce suppression capacitor connected to the tripping coil has a lower capacitance than the tripping energy storage capacitor, and the bounce suppression repulsion generated is much smaller than the tripping repulsion required during opening.

[0040] The bounce suppression control system can be flexibly added or reduced based on actual conditions. If the closing mechanism generates significant bounce, a bounce suppression control system (including a bounce suppression capacitor and electronic switch) can be added to suppress closing bounce. If the closing mechanism generates minimal bounce, which meets customer requirements, the bounce suppression control system can be removed to reduce overall costs.

[0041] The use of a closing bounce suppression mechanism different from that of Example 1 reduces the number of components, simplifies the structure, and reduces costs. In practice, it can be adjusted according to the specific bounce suppression force conditions.

[0042] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0043] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A double eddy current driven fast switch with electromagnetic anti-bounce, characterized in that: It comprises a vacuum interrupter (1), a guide rod (2), a permanent magnetic holding mechanism, a closing bounce suppression mechanism, a double eddy current drive mechanism, a frame (15), a plurality of electronic switches, a plurality of bounce suppression capacitors and a plurality of energy storage capacitors; The top of the guide rod (2) is placed on the vacuum interrupter (1), and the guide rod (2) extends downward to the permanent magnetic holding mechanism, the permanent magnetic holding mechanism comprising an upper closing magnet metal steel plate frame (3), a lower opening magnet metal steel plate frame (7), and a moving soft iron (5) therebetween, the upper closing magnet metal steel plate frame (3) being embedded with an upper closing magnet (4), and the lower opening magnet metal steel plate frame (7) being embedded with a lower opening magnet (6); The closing bounce suppression mechanism is placed below the permanent magnetic holding mechanism and connected to the guide rod (2), and the closing bounce suppression mechanism comprises a single coil support structure (8) and a closing bounce suppression coil (9); the closing bounce suppression coil (9) is mounted on the single coil support structure (8), and the coil support structure is fixedly connected to the frame (15); The dual eddy current drive mechanism is placed below the closing bounce suppression mechanism and connected to the guide rod (2). The dual eddy current drive mechanism comprises an upper closing aluminum disk (10), a closing coil (11), a double coil support structure (12), an opening coil (13) and a lower opening aluminum disk (14). The closing coil (11) and the opening coil (13) are both mounted on the double coil support structure (12), and the double coil support structure (12) is fixed to the frame (15). The single-coil support structure (8) and the double-coil support structure (12) are both support steel plates, and the double-coil support structure (12) has a hollow structure in the middle.

2. A double eddy current driven fast switch with electromagnetic anti-bounce according to claim 1, characterized in that: The closing bounce suppression coil (9) is connected to an upper bounce suppression capacitor (20), and a third electronic switch (21) is connected between the closing bounce suppression coil (9) and the upper bounce suppression capacitor (20); the closing coil (11), the opening coil (13) and the double-coil support structure (12) are arranged in a group, the closing coil (11) is connected to a closing energy storage capacitor (18), and a second electronic switch (19) is connected between the closing coil (11) and the closing energy storage capacitor (18), the opening coil (13) is connected to an opening energy storage capacitor (16) and a lower bounce suppression capacitor (22), the opening coil (13) and the opening energy storage capacitor (16) are connected to a first electronic switch (17), and the opening coil (13) and the opening energy storage capacitor (16) are connected to a fourth electronic switch (23).

3. The double eddy current driven fast switch with electromagnetic anti-bounce according to claim 1, characterized in that: The closing bounce suppression mechanism is composed of an opening coil (13) and a lower opening aluminum disc (14).

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