Bypass switch without chattering

Abstract

A chatter-free bypass switch is disclosed, which prevents chatter occurring during the closing operation of the bypass switch, thereby preventing malfunction of the bypass switch and wear of the contacts within the bypass switch. A chatter-free bypass switch according to one aspect of the present invention may include: a fixed contact connected to a first busbar; a movable contact connected to a second busbar and contacting or separating from the fixed contact; an extension rod installed through the first busbar so as to be in close contact with the fixed contact and movable relative to the first busbar to transmit an impact applied to the fixed contact; and an elastic member installed such that one end contacts the extension rod, and receives and absorbs an impact force applied to the fixed contact via the extension rod when the movable contact contacts the fixed contact.

Description

Technology Field

[0001] The present invention relates to a chatter-free bypass switch, and more specifically, to a chatter-free bypass switch capable of preventing malfunction of the bypass switch and wear of the contacts within the bypass switch by preventing chatter that occurs during the closing operation of the bypass switch. Background Technology

[0003] The present invention relates to a high-speed bypass switch applied to an MMC-STATCOM and an ultra-high voltage direct current transmission HVDC sub-module.

[0004] Generally, the purpose of a high-speed bypass switch is to protect a system composed of a series combination of multiple sub-modules by rapidly isolating the faulty sub-module to prevent the propagation of the fault to adjacent sub-modules when an anomaly, such as an internal fault or failure, is detected, thereby ensuring the continuous normal operation of the system.

[0005] FIG. 2 is an open state diagram of a bypass switch according to the prior art, and FIG. 2 is a closed state diagram of a bypass switch according to the prior art.

[0006] Referring to FIG. 2, a magnetic latch (11) is used to maintain the open state. By the magnetic force of the permanent magnet (11b), the latch plate (11c) is magnetically coupled with the magnet holder (11a), thereby separating the movable contact (4b) and the fixed contact (4a) of the vacuum interrupter (4) to maintain the open state.

[0007] The closing operation of the bypass switch is performed by an explosive actuator (14). When the micro gas generator inside the actuator (14) is activated by an external firing signal, high-pressure gas is released, and this high-pressure gas pushes the piston mounted inside the actuator, thereby separating the latch plate (11c) from the magnet holder (11a). At this time, the movable contact (4b) of the vacuum interrupter (4) moves and comes into contact with the fixed contact (4a), thereby allowing current to flow.

[0008] The spring (9) serves to apply contact pressure so that the fixed contact (4a) and the movable contact (4b) of the vacuum interrupter (4) do not separate due to contact repulsion force generated by the current and external vibrations.

[0009] In the case of conventional technology, when the bypass switch closes, chatter occurs due to face-to-face contact between the fixed contact (4a) and the movable contact (4b) of the vacuum interrupter (4). Chatter is a phenomenon in which the contacts of a switch or relay repeatedly close and open within a very short period of time due to mechanical vibration when the contacts close or open, which causes circuit malfunction and has the problem of accelerating the wear of the contacts (4a, 4b). The problem to be solved

[0011] The present invention aims to solve the aforementioned problems, and the objective of the present invention is to provide a chatter-free bypass switch capable of preventing chatter between the fixed contact and the movable contact of a vacuum interrupter during a bypass close operation.

[0012] The problems of the present invention are not limited to those mentioned above, and other unmentioned problems will be clearly understood by a person skilled in the art to which the present invention pertains from the description below. means of solving the problem

[0014] According to one aspect of the present invention, a chatter-free bypass switch is provided, comprising: a fixed contact connected to a first busbar; a movable contact connected to a second busbar and contacting or separating from the fixed contact; an extension rod installed through the first busbar so as to be in close contact with the fixed contact and movable relative to the first busbar to transmit an impact applied to the fixed contact; and an elastic member installed such that one end contacts the extension rod, and receiving and absorbing an impact force applied to the fixed contact via the extension rod when the movable contact contacts the fixed contact.

[0015] At this time, the other end of the elastic member is connected and supported, and a fixed plate fixedly installed on the first busbar to provide a space for the elastic member to be installed may be included.

[0016] At this time, the fixed plate may include a body portion in which a space for the elastic member is formed and a flange that is fastened to the first busbar.

[0017] At this time, the extension rod may be formed in a cylindrical shape.

[0018] At this time, the extension rod may be formed integrally with the fixed contact.

[0019] At this time, a multi-connector made of a conductive material may be installed between the extension rod and the first busbar, fixed to the first busbar, and slidingly operated on the extension rod.

[0020] At this time, the extension rod and the multi connector are formed in a cylindrical shape, and the multi connector may be formed shorter than the extension rod.

[0021] At this time, the fixed contact is fixed by a bolt, and the bolt can be fixed by passing through the fixed plate, elastic member, and extension rod, with its end screwed into the fixed contact. Effects of the invention

[0023] According to the above configuration, a chatter-free bypass switch according to one aspect of the present invention does not cause chatter when the bypass switch is closed, and as a result, arc generation caused by chatter is prevented, thereby preventing malfunction of the bypass switch and wear of the movable contacts and fixed contacts of the bypass switch.

[0024] The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention. Brief explanation of the drawing

[0026] Figure 1 is a cross-sectional view of an open state of a bypass switch according to the prior art. FIG. 2 is a cross-sectional view of a bypass switch in a closed state according to the prior art. FIG. 3 is an external view of a chatter-free bypass switch according to one embodiment of the present invention. FIG. 4 is a cross-sectional view of an open state of a chatter-free bypass switch according to one embodiment of the present invention. FIG. 5 is a cross-sectional view of a chatter-free bypass switch in a closed state according to one embodiment of the present invention. Specific details for implementing the invention

[0027] Hereinafter, embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. To clearly explain the present invention, parts unrelated to the description in the drawings have been omitted, and the same reference numerals have been used throughout the specification for identical or similar components.

[0028] The words and terms used in this specification and claims are not limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention in accordance with the principles by which the inventor defines terms and concepts to best describe his invention.

[0029] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings correspond to preferred embodiments of the present invention and do not represent all technical concepts of the present invention; thus, various equivalents and modifications that may replace such configurations may exist at the time of filing the present invention.

[0030] In this specification, terms such as “comprising” or “having” are intended to describe the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should not be understood as precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0031] The statement that a component is "in front," "rear," "upper," or "lower" of another component includes, unless there are special circumstances, not only being positioned "in front," "rear," "upper," or "lower" in direct contact with the other component, but also cases where another component is positioned in between. Furthermore, the statement that a component is "connected" to another component includes, unless there are special circumstances, not only being directly connected to each other, but also being indirectly connected to each other.

[0032] Hereinafter, a chatter-free bypass switch according to an embodiment of the present invention is described with reference to the drawings.

[0033] A chatter-free bypass switch according to one embodiment of the present invention is a technical configuration for eliminating chatter, and with reference to FIGS. 3 to 5, it may include a fixed contact (4a), a movable contact (4b), an extension rod (25), an elastic member (23), a fixed plate (22), a multi-connector (24), and a fastening bolt (21).

[0034] Referring to FIGS. 3 to 5, the fixed contact (4a) can be connected to the first busbar (1). That is, the fixed contact (4a) can be electrically connected to the first busbar (1) through an extension rod (25) and a multi-connector (24). Normally, it is in an open state and separated from the movable contact (4b), but in a closed state, it is connected to the movable contact (4b) and can conduct electricity with the second busbar (2). This operation will be described later.

[0035] Referring to FIGS. 3 to 5, the above-mentioned movable contact (4b) is connected to the second busbar (2) and can be in contact with or separated from the above-mentioned fixed contact (4a). This will be described in detail later.

[0036] Referring to FIGS. 3 to 5, the above extension rod (25) is installed through the first busbar (1) so as to be in close contact with the fixed contact (4a) and movable relative to the first busbar (1), and can transmit the impact applied to the fixed contact (4a).

[0037] At this time, the extension rod (25) may be formed in a cylindrical shape. The shape of this extension rod (25) is a shock-absorbing structure and is formed in a cylindrical structure to effectively disperse the impact force. In addition, this cylindrical structure of the extension rod (25) can absorb shock together with an elastic member (23) for preventing chatter, thereby further enhancing shock absorption.

[0038] Here, the extension rod (25) may be formed integrally with the fixed contact (4a). Of course, it may also be inserted as a separate part.

[0039] Referring to FIGS. 3 to 5, the above elastic member (23) is installed so that one end contacts the extension rod (25), and when the movable contact (4b) contacts the fixed contact (4a), it can receive and absorb the impact force applied to the fixed contact (4a) through the extension rod (25).

[0040] At this time, the elastic member (23) acts as a damper and simultaneously gradually dampens the shock transmitted through the extension rod (25), thereby preventing chatter between the movable contact (4b) and the fixed contact (4a).

[0041] That is, when the movable contact (4b) contacts the fixed contact (4a) and an impact force is applied, the impact force is physically transmitted to the elastic member (23) through the extension rod (25). At this time, the impact transmitted through the extension rod (25) is gradually attenuated by the elastic member (23), and this attenuation of the impact force by the elastic member (23) fundamentally blocks the energy source of chatter that may occur between the movable contact (4b) and the fixed contact (4b), thereby eliminating the occurrence of chatter from the beginning.

[0042] At this time, the elastic member (23) may be, for example, a coil spring.

[0043] Referring to FIGS. 3 to 5, the above fixed plate (22) can be fixedly installed on the first busbar (1) to provide a space in which the other end of the elastic member (23) is connected and supported and the elastic member (23) is installed.

[0044] At this time, the fixed plate (22) may include a body portion (22a) in which a space for the elastic member (23) is formed, and a flange (22b) that is fastened to the first busbar (1).

[0045] Referring to FIGS. 3 to 5, the multi connector (24) is installed between the extension rod (25) and the first busbar (1), is fixed to the first busbar (1), and can slide on the extension rod (25), and can be made of a conductive material.

[0046] Here, the extension rod (25) and the multi-connector (24) are formed in a cylindrical shape, and the multi-connector (24) may be formed to be shorter than the extension rod (25). By forming the lengths of the multi-connector (24) and the extension rod (25) differently in this way, a structure can be provided that allows current to flow stably without interfering with the movement of the extension rod (25).

[0047] At this time, the multi-connector (24) may be provided in multiple numbers, and the multi-connector (24) may be inserted and installed by forming a groove in the first busbar (1). The multi-connector (24) may be installed to improve the electrical conduction performance between the first busbar (1) and the extension rod (25).

[0048] Additionally, the multi-connector (24) can closely support the extension rod (25), and the multi-connector (24) may be composed of an elastic conductor to stably maintain electrical coupling with the first busbar (1) even if the extension rod (24) moves. Additionally, the multi-connector (24) may be formed in the form of a plurality of plate springs arranged to form an annular shape.

[0049] In addition, as described above, the multi connector (24) maintains a stable electrical connection between the extension rod (25) and the first busbar (1), thereby suppressing minute vibrations that may occur between the fixed contact (4a) and the movable contact (4b) by increasing the frictional force, and as a result, prevents chatter, thereby enhancing the electrical conduction performance.

[0050] Meanwhile, the fixed contact (4a) is fixed by a fastening bolt (21), and the fastening bolt (21) can be fixed by passing through the fixed plate (22), elastic member (23), and extension rod (25) and screwing its end to the fixed contact (4a).

[0051] Referring to FIG. 3, an external perspective view of a chatter-free bypass switch according to one embodiment of the present invention is shown.

[0052] In the illustrated embodiment, the flange (22b) of the fixing plate (22) is fastened to the outside of the first busbar (1) by a plurality of fastening members (22c). Of course, an elastic member (23) is provided inside the body of the fixing plate (22).

[0053] At this time, the fastening bolt (21) can be fixedly fastened by passing through the fixed plate (22) and the extension rod (25) and screwing into the fixed contact (4a). At this time, the fastening bolt (21) can be combined with the fixed plate (22), the elastic member (23), and the extension rod (25).

[0054] The fastening structure of these fastening bolts (21) can serve to disperse and absorb the impact force through the elastic member (23) when an impact occurs between the movable contact (4b) and the fixed contact (4a).

[0055] That is, when the movable contact (4b) strikes the fixed contact (4a) and an impact occurs, the fixed contact (4a), the bolt (21), and the extension rod (25) together receive the impact force, and the impact force is transmitted to the elastic member (23). Therefore, most of the impact force is transmitted to the elastic member (23), and the elastic member (23) absorbs and attenuates the impact force.

[0056] Overall, when an impact occurs at the movable contact (4b) and the fixed contact (4a), the impact is absorbed and dampened by the shock absorption and damping function of the elastic member (23) and the micro-vibration suppression function of the multi-connector (24), and at the same time, chatter can be blocked.

[0057] Referring to FIG. 4, a cross-sectional view of an open state of a chatter-free bypass switch according to one embodiment of the present invention is shown, and referring to FIG. 5, a cross-sectional view of a closed state of a chatter-free bypass switch according to one embodiment of the present invention is shown.

[0058] In the illustrated embodiment, the bypass switch may include a case (3) having a hollow portion formed inside, a first busbar (1) coupled to the front end of the case (3) and connected to a power source, a second busbar (2) coupled to the rear end of the case (3) and connected to a load, a vacuum interrupter (4) installed in the hollow portion and including a fixed contact (4a) connected to the first busbar (1) and a movable contact (4b) connected to the second busbar (2) and contacting or separating from the fixed contact (4a), an insulating cover (10) coupled to the rear end of the second busbar (2) and having a receiving portion inside, a movable rod (5) installed in the receiving portion of the insulating cover (10) and coupled to the movable contact (4b), and an actuator (14) installed in the rear end of the insulating cover (10) and providing power to move the movable rod (5).

[0059] The case (3) forms the exterior of the bypass switch. The case (3) may be formed as a tubular member. The case (3) may be made of an insulating material.

[0060] At this time, the case (3) has a hollow portion formed therein that can accommodate other parts. A vacuum interrupter (4) and a movable rod (5) can be installed in the hollow portion.

[0061] At this time, a plurality of ventilation holes (121) may be formed along the outer surface of the case (3).

[0062] A first busbar (1) is provided. The first busbar (1) may be formed as a flat plate. The first busbar (1) is connected to the front end of the case (3).

[0063] At this time, the first busbar (1) is connected to a power source and becomes a current-carrying path through which current flows.

[0064] At this time, the first busbar (1) is connected to the case (3).

[0065] At this time, a through hole may be formed in the first busbar for inserting an extension rod and a multi-connector.

[0066] A second busbar (2) is provided. The second busbar (2) may be formed as a flat plate. The second busbar (2) is connected to the rear end of the case (3).

[0067] At this time, the second busbar (2) is connected to the load and becomes a current path through which current flows.

[0068] At this time, a contactor connection portion formed as a through hole is provided in the second busbar (2). A multi-contactor (7) and a multi-contactor socket (6) are inserted and installed therein.

[0069] The vacuum interrupter (4) includes a fixed contact (4a) positioned at one end and a movable contact (4b) positioned at the other end that contacts or separates from the fixed contact (4a).

[0070] At this time, the vacuum interrupter (4) can be installed as a vacuum case (4c) inside the case (3), and the interior can form a vacuum space (4d). The vacuum interrupter (4) is placed in the hollow portion of the case (3) and is protected and supported by the case (3). The vacuum interrupter (4) is installed such that its outer surface has a predetermined gap from the case (3), except for the two ends where the fixed contact (4a) and the movable contact (4b) are installed. That is, the inner diameter of the case (3) is formed to be larger than the outer diameter of the vacuum interrupter (4). Accordingly, the vacuum interrupter (4) can be cooled by air entering through the ventilation hole of the case (3).

[0071] At this time, the fixed contact (4a) is fixed to the first busbar (1) by the fixed contact fastening bolt (21).

[0072] At this time, the movable contact (4b) is coupled to the movable rod (5). A contact pressure spring (4e) may be installed on the outer surface of the movable contact.

[0073] A multi-contactor socket (6) is provided. The multi-contactor socket (6) is inserted and installed in the contactor connection part. The multi-contactor socket (6) may be formed in the shape of a tube. The rear end of the multi-contactor socket (6) has a large diameter and is formed with a step so that a support portion is installed in contact with the rear surface of the second busbar (2). The multi-contactor socket (6) provides a space into which the movable rod (5) is inserted and supports the movable rod (5) and the movable contact (4b).

[0074] At this time, a contactor insertion groove is formed in the inner surface of the multi-contactor socket (6) so that a multi-contactor (7) can be partially inserted therein. The contactor insertion groove may be formed in the shape of a ring groove.

[0075] A multi-contactor (7) is provided. The multi-contactor (7) may be provided in multiple units. The multi-contactor (7) is inserted and installed in the multi-contactor socket (6). The multi-contactor (7) is inserted and installed in the contactor insertion groove of the multi-contactor socket (6). The multi-contactor (7) is provided to improve the electrical conduction performance between the multi-contactor socket (6) and the movable rod (5). In addition, the multi-contactor (7) closely supports the movable rod (5). The multi-contactor (7) may be composed of an elastic conductor to stably maintain an electrical connection with the multi-contactor socket (6) even when the movable rod (5) moves. The multi-contactor (7) may be provided as a group of multiple plate springs arranged to form an annular shape.

[0076] At this time, a multi-connector (24) can also be installed on the first busbar (1) in the same manner. Of course, this function can also improve current conduction performance.

[0077] At this time, the movable rod (5) is installed to pass through the multi-contactor socket (6) and is coupled to the movable contact (4b). The movable rod (5) pushes the movable contact (4b) to make contact with the fixed contact (4a).

[0078] At this time, an extension rod protrusion (161) is formed protruding from the front end of the movable rod (5) and is inserted and coupled into an insertion groove formed in the movable contact (4b). Accordingly, the movable rod (5) and the movable contact (4b) move as a single unit.

[0079] At this time, the movable rod (5) is formed with a groove that opens to the rear, and an operating part (162) is formed to accommodate a part.

[0080] That is, the movable rod (5) is formed in the shape of a cylinder. A push rod (8), a contact spring (9), and a latch plate (11c) are inserted and installed in the operating part. The operating part provides a space where the contact spring (9), etc., can operate.

[0081] A push rod (8) is provided. The push rod (8) moves according to the power generated by the actuator (14) to move the movable contact (4b) through the movable rod (5).

[0082] At this time, the push rod (8) is installed spaced apart from the magnetic latch (11). That is, the rear end of the push rod (8) is positioned further forward than the front end of the magnetic latch (11). Accordingly, interference caused by the attractive force between the push rod (8) and the magnetic latch (11) can be avoided.

[0083] A contact pressure spring (9) is provided. The contact pressure spring (9) is provided to apply pressure to the push rod (8). The pressure applied by the contact pressure spring (9) to the push rod (8) acts as a contact pressure that presses the movable contact (4b) through the movable rod (5). Due to this contact pressure, the contact parts (4a, 4b) are not separated by an external force generated in the closed state.

[0084] At this time, the front end of the contact spring (9) contacts the push rod (8), and the rear end contacts the end cover (13). Since the end cover (13) is fixedly installed on the insulating cover (10), the contact spring (9) exerts force in the direction of pressing the push rod (8).

[0085] A latch plate (11c) is provided. The latch plate (11c) is fixed to the movable rod (5) and attracted to the permanent magnet (11b) to keep the movable contact (4b) in an open state separated from the fixed contact (4a). It is preferable that the latch plate (11c) be formed of a magnetic material.

[0086] An insulating push rod (12) is provided. The insulating push rod (12) is coupled to the push rod (8) and moves the push rod (8) by the explosive force of the actuator (14). The insulating push rod (12) is formed of an insulating material to improve the insulation performance between the push rod (8) and the magnetic latch (11).

[0087] A magnetic latch (11) is provided. The magnetic latch consists of an outer holder (11a), an inner holder (197), and a permanent magnet (11b). The magnetic latch serves to attract the latch plate (11c). It is preferable that the outer holder (11a) and the inner holder (197) be formed of a magnetic material.

[0088] At this time, a permanent magnet (11b) is fixed between the outer holder (11a) and the inner holder (197). The permanent magnet (11b) may be composed of a flat magnet. A plurality of permanent magnets (11b), for example, four, may be provided.

[0089] At this time, the permanent magnet (11b) attracts the latch plate (11c) in the normal state so that the movable contact (4b) remains in an open state separated from the fixed contact (4a).

[0090] An insulating cover (10) is provided to improve insulation between the conductive part including busbars (1, 2) and the actuator (14). The insulating cover (10) is provided specifically for electrical insulation between the actuator (14) and the second busbar (2).

[0091] Accordingly, insulation design for the external ignition device is unnecessary, and since the ignition signal is received based on ground, the probability of noise generation in the ignition signal is reduced, allowing for accurate and stable operation of the bypass switch.

[0092] The insulating cover (10) is positioned at the rear of the second busbar (2). Accordingly, the current entering from the power source through the first busbar (1) flows to the load through the second busbar (2), and the current-carrying section is configured to be separated from the actuator (14), thereby ensuring sufficient insulation between the current-carrying section and the actuator section.

[0093] At this time, the insulating cover (10) may be formed in the shape of a cylinder with an open front. The receiving portion of the insulating cover (10) accommodates the movable parts, excluding the movable contact (4b), namely the movable part rod (5), push rod (8), contact pressure spring (9), latch plate (11c), and insulating push rod (12).

[0094] At this time, an end cover (13) is attached behind the insulating cover (10). The end cover (13) is formed of an insulating material. The end cover (13) serves to insulate the contact pressure spring (9) and the actuator (14).

[0095] The actuator (14) is an explosive power source. When an accident current occurs, the actuator (14) explodes upon an external firing signal to push the insulating push rod (12) and generate power to move the movable contact (4b).

[0096] At this time, the actuator (14) is equipped with a piston (15) that moves forward by gas pressure upon explosion and pushes out the insulating push rod (12).

[0097] In a normal state where each sub-module is operating normally, the latch plate (11c) is attracted by the magnetic force of the magnetic latch (11) and is placed in contact with the holder (11a). Accordingly, the movable rod (5) connected to the latch plate (11c) and the movable contact (4b) connected to the movable rod (5) also move backward, so that the contact portions (4a, 4b) remain in an open state.

[0098] Therefore, no current flows through the bypass switch.

[0099] When a failure occurs in a sub-module, and such failure is detected and an external electrical signal is input, the gas generator in the actuator (200) operates to generate gas pressure. As the piston (15) moves forward due to the gas pressure, it pushes the insulating push rod (12). The push rod (8), the movable rod (5), and the movable contact (4b) move forward in conjunction with this, overcoming the attractive force between the latch plate (11c) and the permanent magnet (11b). Accordingly, the movable contact (4b) comes into contact with the fixed contact (4a), and current flows.

[0100] In other words, current flows through the bypass switch, creating a current bypass path that excludes the corresponding sub-module.

[0101] At this time, when the movable contact (4b) contacts the fixed contact (4b), an impact is inevitably applied, and chatter occurs due to the repulsive force caused by the impact. However, in this case, when the movable contact (4b) contacts the fixed contact (4a), the impact force causes the extension rod (25) to be pushed and move toward the fixed plate (22), thereby compressing the elastic member (23), and this reaction occurs instantaneously.

[0102] That is, when the movable contact (4b) contacts the fixed contact (4a), the impact generated is absorbed by the elastic member (23), thereby preventing the chatter phenomenon caused by the repulsive force.

[0103] Although embodiments of the present invention have been described, the spirit of the present invention is not limited by the embodiments presented in this specification. Those skilled in the art who understand the spirit of the present invention may easily propose other embodiments within the scope of the same spirit by adding, changing, deleting, or adding components, and such are also to be considered to fall within the scope of the spirit of the present invention. Explanation of the symbols

[0105] 1 : 1st busbar 2 : 2nd busbar 3 : Case 4: Vacuum Interrupter 4a: Fixed contact 4b : Movable contact 4c: Vacuum case 4d: Vacuum space 4e : Spring 5 : Movable part rod 6: Multi-contact socket 7 : Multi-contactor 8: Push rod 9 : Pressure spring 10: Insulation cover 11: Magnetic latch 11a: Outer holder 11b: Permanent magnet 11c : Latch plate 12: Insulated push rod 13 : End cover 14 : Actuator

Claims

Claim 1 A chatter-free bypass switch comprising: a fixed contact connected to a first busbar; a movable contact connected to a second busbar and contacting or separating from the fixed contact; an extension rod installed through the first busbar so as to be in close contact with the fixed contact and movable relative to the first busbar to transmit an impact applied to the fixed contact; and an elastic member installed so as to have one end in contact with the extension rod, and receiving and absorbing an impact force applied to the fixed contact via the extension rod when the movable contact contacts the fixed contact. Claim 2 A chatter-free bypass switch according to claim 1, comprising: a fixed plate fixedly installed on the first busbar to provide a space for the elastic member to be installed, wherein the other end of the elastic member is connected and supported. Claim 3 In claim 2, the fixed plate comprises a body portion having a space formed for the elastic member and a flange connected to the first busbar, a chatter-free bypass switch. Claim 4 In claim 1, the extension rod is formed in a cylindrical shape, a chatter-free bypass switch. Claim 5 In claim 1, the extension rod is integrally formed with the fixed contact, a chatter-free bypass switch. Claim 6 A chatter-free bypass switch according to claim 1, installed between the extension rod and the first busbar, and equipped with a multi-connector made of a conductive material that is fixed to the first busbar and slides on the extension rod. Claim 7 In claim 6, the extension rod and the multi-connector are cylindrical, and the multi-connector is formed shorter than the extension rod, a chatter-free bypass switch. Claim 8 A chatter-free bypass switch according to claim 2, wherein the fixed contact is fixed by a bolt, and the bolt penetrates the fixed plate, elastic member, and extension rod, and the end thereof is screw-coupled to the fixed contact.

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