Interlock apparatus for preventing closing of circuit breaker

Abstract

The present invention relates to an interlock apparatus for preventing closing of a circuit breaker, and more specifically, to an interlock apparatus for preventing closing of a circuit breaker having a mechanical interlock function and an electrical interlock function. According to one embodiment of the present invention, the interlock apparatus for preventing closing of a circuit breaker performs an interlock function against mechanical closing and an interlock function against electrical closing.

Description

Interlock device to prevent closing of a circuit breaker

[0001] The present invention relates to a circuit breaker closing prevention interlock device, and more specifically, to a circuit breaker closing prevention interlock device having a mechanical interlock function and an electrical interlock function.

[0002] Generally, a circuit breaker is an electrical device installed in a part of an electrical system that protects the circuit and load by automatically interrupting the circuit in the event of an electrical overload or short circuit.

[0003] A circuit breaker is largely composed of a terminal section that can be connected to a power source or a load side, a contact section including a fixed contact and a movable contact that contacts or separates the circuit to connect or disconnect the circuit, a switching mechanism that moves the movable contact to provide power necessary for opening or closing the circuit, a trip section that detects an overcurrent or short-circuit current on the power source side and induces a tripping operation of the switching mechanism, and an arc extinguishing section for extinguishing an arc generated when interrupting an abnormal current.

[0004] Among these circuit breakers, vacuum circuit breakers are used as circuit breakers installed in high-voltage power systems to protect the power system by interrupting the circuit in the event of dangerous situations such as short circuits or overcurrents. A vacuum circuit breaker is a product that protects human life and load equipment by interrupting the circuit using a vacuum arc extinguishing method in a vacuum interrupter (VI) inside the breaker by an external relay when abnormal currents, such as overcurrents, short circuits, and ground faults, occur in extra-high voltage / high-voltage distribution lines.

[0005] These high-voltage circuit breakers are installed together with distribution panels that house and manage various electrical equipment, including circuit breakers, for the operation and control of power plants and substations, as well as the operation of motors; they are typically housed inside the circuit breaker room or cradle of the distribution panel.

[0006] Inside the cradle (circuit breaker room), there is a service position where the circuit breaker terminals are connected to the load terminals of the cradle to supply voltage and current, and a test position that is separated from the terminals of the cradle to allow only operation testing of the circuit breaker.

[0007] A circuit breaker is equipped with a closing spring and a tripping spring to provide power for performing a closing operation or a tripping operation.

[0008] During operation, the energy of the closing spring of the circuit breaker remains charged. In other words, the spring energy is stored in preparation for the situation where it is re-closed after interrupting the fault current.

[0009] Meanwhile, circuit breakers are equipped with an interlock device to prevent closing as needed. Examples of the operation of the interlock device according to the location of the circuit breaker are as follows.

[0010] A circuit breaker according to the prior art is illustrated in FIGS. 1 to 3. A state in which the circuit breaker body (2) is inserted into the circuit breaker room (1) is illustrated. FIGS. 1 to 3 respectively illustrate a disconnect state, a test state, and a service (connected) state.

[0011] With the circuit breaker body (2) loaded on the cradle (3), it moves to each position inside the circuit breaker room (1).

[0012] Meanwhile, the circuit breaker body (2) is equipped with a mechanism (4) to perform operations related to the insertion and interruption of the contact part.

[0013] In addition, FIGS. 4 to 6 illustrate the state of the mechanism of the equipment in each state (disconnect state, test state, and operation state). FIG. 7 also illustrates the internal structure of the circuit breaker.

[0014] The mechanism of the large-capacity circuit breaker is composed of a closing lever (13) and a closing latch (15) for operating a closing spring, a trip lever (14) for operating a trip spring, a power shaft (5) that rotates by receiving driving force from a motor (not shown), a drive lever (6), a crank shaft (7), an operating lever (8), an interlock rod (9), a position interlock device (10) for preventing closing between closing and closing, a closing interlock device (11) for preventing operation of the closing latch between closing and closing, an interlock operating rail (12), etc.

[0015] As shown in FIGS. 1 and FIGS. 4, in the initial state (disconnected state), the closing spring (not shown) is not loaded (charged).

[0016] When the circuit breaker body (2) enters a test state as shown in FIGS. 2 and FIGS. 5, the crank shaft (7) rotates and the closing spring is loaded. At this time, the crank shaft (7) is caught on the end of the closing latch (15) and the circuit breaker is ready to close.

[0017] As shown in Fig. 6, when the insertion lever (13) is operated to release the restraint of the crankshaft by the insertion latch (15), the crankshaft (7) rotates and at the same time the operation lever (8) also rotates to perform the insertion operation.

[0018] In the state shown in Fig. 6, when the trip lever (14) is operated (released from restraint), the mechanism returns to the initial position shown in Fig. 4.

[0019] Meanwhile, in the prior art, a position interlock device (10) is operated in conjunction with an interlock operation rail (12) at the bottom of the circuit breaker as shown in FIG. 8 so that the high-capacity circuit breaker can perform closing / tripping operations only at three specific positions (disconnected position, test position, connected position).

[0020] As shown in Fig. 8, at each position (Disconnected, Test, Connected), the position interlock device (10) moves downward, causing the interlock rod (9) linked to the position interlock device (10) to move downward, and accordingly, the insertion interlock device (11) linked to the interlock rod (9) also moves downward, so as not to interfere with the movement of the operation lever (8), the insertion latch (15) can be operated.

[0021] If the position interlock device (10) moves upward along the interlock operating rail (12), the movement of the operating lever (8) is hindered by the interlock rod (9), so the movement of the insertion latch (15) is also restricted.

[0022] This interlock operation functions in conjunction with specific points or sections of the input / output process. In other words, the example examined above is a position interlock device that restricts closing based on the position of the circuit breaker.

[0023] In addition, circuit breakers within the distribution panel require interlock functions based on specific states or locations. For example, this includes restricting the incoming operation when the control power is connected in the test position, restricting the closing (On) of the breaker while it is closing, or restricting the outgoing operation when the breaker is in the closed (On) state in the operating position.

[0024] In addition, circuit breakers may perform an interlock function in conjunction with the distribution panel door. Examples include restricting the opening of the distribution panel door when the breaker enters the panel, or restricting closing when the door is open.

[0025] In addition, circuit breakers may have control power and closing interlocks linked. Examples include plug interlock devices that prevent the circuit breaker body from being inserted or closed when the control power plug is not inserted.

[0026] As described above, interlock devices are provided to prevent the closing of circuit breakers in various situations.

[0027] However, this interlock function is primarily mechanical, and no interlock function is provided for electrical insertion. In other words, it cannot restrict situations where the insertion lever is electrically actuated by the insertion coil.

[0028] In addition, there is a need for an interlock device that performs the comprehensive function of fundamentally restricting the closing of the circuit breaker regardless of its location.

[0029] The present invention was devised to solve the aforementioned problems, and its purpose is to provide a circuit breaker closing prevention interlock device having a mechanical interlock function and an electrical interlock function.

[0030] A circuit breaker according to one embodiment of the present invention comprises an interlock coil assembly provided in a circuit breaker body; and an interlock pin movably provided in the interlock coil assembly and positioned above a closing lever of a mechanism, wherein when a control power supply is not connected, the interlock pin obstructs the movement of the closing lever, and when a control power supply is connected, the interlock pin moves toward the interlock coil assembly and moves away from the closing lever.

[0031] Herein, the interlock coil assembly comprises an interlock bracket installed on the circuit breaker body, a yoke installed on the interlock bracket, an interlock coil portion mounted on the yoke, an interlock pin installed to be movable along the longitudinal direction within the interlock coil portion, and a movable pin inserted into the interlock pin.

[0032] In addition, the interlock bracket is composed of a base bracket coupled to the mechanical panel of the circuit breaker body and a cover bracket coupled to the base bracket.

[0033] In addition, a through hole is formed in the central surface of the base bracket so that the movable pin can be inserted and move.

[0034] In addition, an action hole is formed in the central surface of the cover bracket so that the interlock pin can be inserted and move.

[0035] In addition, the yoke is composed of a base yoke installed on the base bracket and a cover yoke coupled to the base yoke.

[0036] In addition, an iron core formed in a tubular shape is provided on the central surface of the base yoke.

[0037] In addition, the above-mentioned core part has a central hole formed therein that communicates with the through hole and into which the movable pin is inserted.

[0038] In addition, a return spring is provided between the above-mentioned iron core and the movable pin.

[0039] In addition, the base yoke is formed in a 'U' shape, and multiple coupling grooves are formed at the ends of both sides of the base yoke.

[0040] In addition, the cover yoke is formed as a flat plate, and a plurality of coupling protrusions are formed on both sides of the cover yoke to be fitted into the coupling grooves.

[0041] In addition, the cover yoke has an insertion hole formed in the center that communicates with the action hole and into which the interlock pin is inserted.

[0042] In addition, the interlock coil portion comprises a bobbin formed in a cylindrical shape having a hollow portion and a coil wound around the circumference of the bobbin.

[0043] In addition, the interlock pin and the movable pin are inserted into the hollow portion.

[0044] In addition, the interlock pin is composed of a first body part and a second body part formed with a step.

[0045] In addition, an insertion groove is formed along the axial direction in the first body portion of the interlock pin, and the movable pin is inserted and installed in the insertion groove.

[0046] In addition, a locking plate is formed protruding along the circumferential direction in the middle part of the above-mentioned movable pin.

[0047] And, the above return spring is provided between the iron core and the locking plate.

[0048] According to an embodiment of the present invention, a circuit breaker closing prevention interlock device performs an interlock function for mechanical closing and an interlock function for electrical closing.

[0049] Here, since the interlock function is performed at the top of the insertion lever by the interlock coil assembly, it performs the interlock function not only for mechanical insertion by the insertion lever but also for electrical insertion resulting from the operation of the insertion coil.

[0050] Accordingly, it performs the function of fundamentally blocking the closing of the circuit breaker.

[0051] This insertion interlock function can be used independently without being linked with doors, transfer devices, or mechanical parts. In other words, it can be operated comprehensively.

[0052] In addition, since only the insertion interlock assembly is applied, the interlock device becomes simpler. The use of complex devices is reduced.

[0053] In addition, it can be applied in parallel with conventional interlock devices based on specific states. Although the device of the present invention performs a comprehensive input interlock function, since it is installed and operated separately from conventional devices, it can be used in conjunction with devices that perform interlock functions based on specific states.

[0054] FIGS. 1 to 3 show the states of a circuit breaker according to the prior art. They respectively show a disconnected state, a test state, and a connected state.

[0055] FIGS. 4 to 6 are state diagrams of the mechanism of the mechanical part in the disconnected state, test state, and connected state, respectively.

[0056] FIG. 7 is an internal perspective view of a switchboard according to the prior art.

[0057] FIG. 8 is an operating state diagram of a position interlock device and an interlock rail in a circuit breaker according to the prior art.

[0058] FIG. 9 is a perspective view of a part of a distribution board and a circuit breaker according to one embodiment of the present invention.

[0059] FIG. 10 is a perspective view of a circuit breaker according to one embodiment of the present invention. The cover of the mechanism has been removed.

[0060] Figure 11 is a detailed view of the insertion lever part in Figure 10.

[0061] FIGS. 12 and FIGS. 13 are a perspective view and an exploded perspective view of an interlock coil assembly applied to a circuit breaker according to one embodiment of the present invention.

[0062] FIGS. 14 and 15 are operational diagrams of a circuit breaker according to an embodiment of the present invention. FIG. 14 shows an interlock engaged state, and FIG. 15 shows an interlock released state.

[0063] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, this description is intended to be detailed enough for a person skilled in the art to easily practice the invention, and it does not imply that the technical scope and concept of the present invention are limited by these drawings.

[0064] The terms "part" or "part" used to refer to components in this invention are not used for any limiting purpose and may be omitted.

[0065] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. This description is intended to be detailed enough for a person skilled in the art to easily practice the invention, and does not imply that the technical scope and concept of the present invention are limited thereby.

[0066] FIG. 9 is a perspective view of a part of a distribution board and a circuit breaker according to one embodiment of the present invention, FIG. 10 is a perspective view of a circuit breaker according to one embodiment of the present invention, and FIG. 11 is a detailed view of the closing lever portion in FIG. 10. With reference to the drawings, a circuit breaker according to each embodiment of the present invention will be described in detail.

[0067] A closing interlock device for a circuit breaker according to one embodiment of the present invention comprises: an interlock coil assembly (400) provided in a circuit breaker body (100); and an interlock pin (460) movably provided in the interlock coil assembly (400) and positioned on the upper part of a closing lever (310) of a mechanism (250), wherein when a control power supply is not connected, the interlock pin (460) interferes with the movement of the closing lever (310), and when a control power supply is connected, the interlock pin (460) moves toward the interlock coil assembly (400) and moves away from the closing lever (310).

[0068] The circuit breaker room (100) is provided in the form of a cabinet or a box. The circuit breaker room (100) may be composed of multiple plates (panels). An upper plate (110), a rear plate (115), and a lower plate (120) are shown. For ease of understanding, the circuit breaker room (100) is shown with the front door and side plate removed. In the circuit breaker room (100), terminal bushings (131, 132) are installed on the rear plate for each phase. The terminal bushings (131, 132) may be provided as a pair of upper and lower terminal bushings for each phase. In this case, they are each connected to a power source or a load. That is, the upper terminal may be connected to the power source and the lower terminal may be connected to the load.

[0069] The circuit breaker body (200) is loaded onto a transfer cart (230) and moved into or out of the circuit breaker room (100). The circuit breaker body (200) can be moved into or out of an inspection position (disconnected state), a preparation position (test state), and an operation position (connected state) by the transfer cart (230).

[0070] The circuit breaker body (200) is provided with a blocking unit (210) that is connected to the main circuit for each phase and can energize or interrupt the circuit. The blocking unit (210) is also referred to as the main circuit unit.

[0071] Among circuit breakers, in the case of a circuit breaker installed in a high-voltage power system, a vacuum circuit breaker, etc., may be used as the breaking section (210). When abnormal currents such as overcurrent, short circuit, and ground fault occur in extra-high voltage / high-voltage distribution lines, the vacuum circuit breaker protects human life and load equipment by interrupting the circuit in a vacuum interrupter (VI) inside the breaking section by a vacuum arc extinguishing method via a separate external relay.

[0072] A blocking unit (210) is provided for each phase. The blocking unit (210) is equipped with a fixed contact and a movable contact. A vacuum interrupter may be applied to the blocking unit (210) applied to the high-voltage circuit. The movable contact is connected to the movable link (290) of the mechanism and moves to connect to or disconnect from the fixed contact. When the movable contact contacts the fixed contact, the main circuit is connected, and when the movable contact is separated from the fixed contact, the main circuit is disconnected.

[0073] The blocking unit (210) includes an upper terminal (first terminal) (212) connected to a power source and a lower terminal (second terminal) (214) connected to a load.

[0074] A mechanism (250) is provided in the main body (200) of the circuit breaker. The mechanism (250) provides power to switch on or off the circuit, and an on button (251) and an off button (252) are exposed to the outside. A user can switch on or off the circuit breaker by operating the on button (251) and the off button (252).

[0075] FIG. 10 shows a perspective view of a circuit breaker. It is shown with the front plate of the mechanism (250) removed. FIG. 11 is a detailed view of the insertion lever portion.

[0076] The main components of the mechanism (250) are installed on the mechanism panel (240).

[0077] The mechanism (250) is equipped with an input lever (310) connected to an on button (251) and a trip lever (350) connected to an off button (252).

[0078] An on button transmission lever (315) may be provided between the on button (251) and the input lever (310), and an off button transmission lever (365) may be provided between the off button (252) and the trip lever (350).

[0079] When the on button (251) is pressed, the insertion lever (310) moves upward via the on button transmission lever (315) to rotate the insertion latch (330) clockwise. When the insertion latch (330) rotates clockwise, the restraint of the mechanism is released, and the insertion operation occurs.

[0080] When the off button (252) is pressed, the trip lever (350) moves upward via the off button transmission lever (365) and rotates the trip latch (370) counterclockwise.

[0081] The mechanism comprises an insertion lever (310) and an insertion latch (330) for operating the insertion spring, a trip lever (350) and a trip latch (370) for operating the trip spring, a power shaft (260) that rotates by receiving power from a drive motor (255), a drive lever (265), a crank shaft (270), an operating lever (275), an interlock lever (280), etc.

[0082] Additionally, the mechanism (250) includes an input coil (320) that operates the input lever (310) by electromagnetic force and a trip coil (360) that operates the trip lever (350) by electromagnetic force.

[0083] The insertion coil (320) is equipped with an insertion coil actuator (325). When current flows through the insertion coil (320), the insertion coil actuator (325) rises to raise the insertion lever (310), causing the mechanism (250) to perform an insertion operation.

[0084] The trip coil (360) is equipped with a trip coil actuator (355). When current flows through the trip coil (360), the trip coil actuator (355) rises to raise the trip lever (350), causing the mechanism (250) to perform a trip operation.

[0085] The operation of the mechanism of the circuit breaker is as follows. A transfer carriage (230) is provided at the bottom of the circuit breaker (200). The transfer carriage (230) is equipped with wheels (232) to move the main body of the circuit breaker forward and backward inside the circuit breaker room (100).

[0086] When the circuit breaker (200) is in the initial state (disconnect position), the insertion spring (not shown) is not loaded (charged).

[0087] When the circuit breaker (200) enters the test position, the control power is connected and ready to load the insertion spring.

[0088] When the circuit breaker (200) enters the operating position, the drive motor (255) operates to rotate the power shaft (260), thereby rotating the drive lever (265). Accordingly, the insertion spring connected to the rear end of the drive lever (265) is loaded. As the power shaft (260) rotates, the operating lever (275) and the crank shaft (270) also rotate, and the drive lever (290) is ready to be operated. At this time, the crank shaft (270) is caught on the end of the insertion latch (330), and the circuit breaker is in a ready state for insertion. That is, the crank shaft (270) is caught on the insertion latch (330) and is in a restrained state. A roller (332) may be provided at the end of the insertion latch (330).

[0089] Here, when the insertion lever (310) is operated to release the crankshaft (270) by the insertion latch (330), the crankshaft (270) rotates and simultaneously the operation lever (275) also rotates to perform the insertion operation. The operation of the operation lever (275) is transmitted to the drive lever (290) via the interlock lever (280) to connect the blocking part (210) and energize the main circuit.

[0090] Here, as previously mentioned, there are methods of operating the input lever (310) such as operating it mechanically by pressing the on button (251) and operating it electrically by applying current to the input coil (320).

[0091] With reference to FIGS. 12 and 13, an interlock coil assembly (400) will be described. FIGS. 12 and 13 are a perspective view and an exploded perspective view of an interlock coil assembly applied to a circuit breaker according to one embodiment of the present invention.

[0092] The interlock coil assembly (400) includes an interlock bracket (410, 420), a yoke (430, 440), an interlock coil section (450), an interlock pin (460), and a movable pin (470).

[0093] An interlock bracket (410, 420) is installed on the mechanism panel (240).

[0094] The interlock bracket (410, 420) may be composed of a base bracket (first bracket) (410) and a cover bracket (second bracket) (420).

[0095] The base bracket (410) supports the yoke (430, 440) and the interlock coil part (450), etc.

[0096] The base bracket (410) can be formed in a 'U' shape. The base bracket (410) is connected to the mechanism panel (240) by a fastening member (418).

[0097] An incision hole (413) may be formed on one side (411) of the base bracket (410) that is joined to the mechanism panel (240). The incision hole (413) may extend to the center surface.

[0098] A through hole (415) is formed in the central surface of the base bracket (410) through which a movable pin (470) can be inserted and moved.

[0099] A plurality of fastening members for fixing the yoke (430, 440) are connected to the other side (412) of the base bracket (410).

[0100] The cover bracket (420) can be formed in a 'U' shape. The cover bracket (420) is connected to the base bracket (410) by a fastening member. The base bracket (410) and the cover bracket (420) are connected in a box shape to form an internal space.

[0101] A ventilation hole (421) may be formed on one side (upper surface) of the cover bracket (420). The ventilation hole (421) of the cover bracket (420) serves as a passage for internal heat to be dissipated.

[0102] An action hole (425) is formed in the central surface of the cover bracket (420) through which an interlock pin (460) can be inserted and moved. The action hole (425) of the cover bracket (420) is formed in a direction opposite to the through hole (415) of the base bracket (410). That is, the action hole (425) of the cover bracket (420) and the through hole (415) of the base bracket (410) are formed so that an axis in the horizontal direction (left and right direction) can be inserted.

[0103] A ventilation hole (422) may be formed on the other side (bottom) of the cover bracket (420). The ventilation hole (422) of the cover bracket (420) serves as a passage for internal heat to be emitted.

[0104] On the upper and lower surfaces of the cover bracket (420), a connecting portion (423) into which a fastening member for coupling to the base bracket (410) is inserted is formed protrudingly.

[0105] The yoke (430, 440) is provided to mount the interlock coil portion (450) and form a magnetic path.

[0106] The yoke (430, 440) consists of a base yoke (first yoke) (430) and a cover yoke (second yoke) (440).

[0107] The base yoke (430) can be formed in a 'U' shape.

[0108] A plurality of fastening holes are formed on both sides (431, 432) of the base yoke (430) to which fastening members are coupled. The base yoke (430) is coupled to the base bracket (410).

[0109] An iron core (435) formed in a tubular shape is provided on the central surface of the base yoke (430). The iron core (435) is made of a ferromagnetic material. The iron core (435) is attracted to the magnetic material. At this time, since the iron core (435) is fixed to the base yoke (430), the magnetic material is attracted to the iron core (435). That is, when the interlock pin (460) is magnetized, it is attracted to the iron core (435).

[0110] A return spring (480) is supported in the iron core (435).

[0111] The movable pin (470) moves through the central hole (436) of the iron core (435). The central hole (436) of the iron core (435) is connected to the through hole (415) of the base bracket (410).

[0112] A plurality of fastening holes (438) are formed in the central surface of the base yoke (430) to secure one end of the interlock coil portion (450).

[0113] A plurality of connecting grooves (437) are formed at the ends of both sides (431, 432) of the base yoke (430).

[0114] The cover yoke (440) can be formed as a flat plate. The cover yoke (440) is joined to the base yoke (430) to provide a space inside.

[0115] An insertion hole (445) into which an interlock pin (460) is inserted is formed in the center of the cover yoke (440). The insertion hole (445) of the cover yoke (440) communicates with the operating hole (425) of the cover bracket (420).

[0116] A plurality of fastening holes (448) are formed in the cover yoke (440) to secure the other end of the interlock coil portion (450).

[0117] Connecting protrusions (447) are formed on both sides of the cover yoke (440). The connecting protrusions (447) of the cover yoke (440) are fitted into the connecting grooves (437) of the base yoke (430) so that the cover yoke (440) is connected to the base yoke (430).

[0118] The yoke (430, 440) is composed of a magnetic material such as iron and can act as a magnetic field that forms when current flows through the interlock coil part (450).

[0119] The interlock coil section (450) consists of a bobbin (451) and a coil (452). The coil (452) is wound on the bobbin (451).

[0120] A movable pin (470) and an interlock pin (460) are inserted and installed in the hollow portion (455) that penetrates the center along the longitudinal direction of the bobbin (451).

[0121] Fastening members are provided on both sides of the bobbin (451) and connected to the yoke (430, 440).

[0122] The end of the coil (452) is equipped with a connector (457) and connected to a control power source. When the control power source is turned on, current flows through the coil (452), a magnetic field is formed around it, and the yoke (430, 440) is magnetized.

[0123] The interlock pin (460) is formed in the shape of a cylinder.

[0124] The interlock pin (460) is made of a magnetic material such as iron. The interlock pin (460) is magnetized by the magnetic field generated when current flows through the interlock coil part (450). Accordingly, the interlock pin (460) is attracted to the iron core part (435).

[0125] The interlock pin (460) is inserted and installed in the hollow portion (455) of the interlock coil portion (450) and moves along the left and right directions (horizontal direction).

[0126] The interlock pin (460) protrudes into the operating hole (425) of the cover bracket (420) when no external force is applied and is positioned on the upper part of the insertion lever (310). Accordingly, the interlock pin (460) restricts the movement of the insertion lever (310).

[0127] When the interlock pin (460) is magnetized, it is attracted to the iron core (435) and moves to the left, so the movement of the insertion lever (310) is not restricted.

[0128] The interlock pin (460) can be divided into a first body portion (461) and a second body portion (465). A step is formed at the contact point between the first body portion (461) and the second body portion (465), and the first body portion (461) and the second body portion (465) are formed with different diameters. The diameter of the second body portion (465) is formed to be smaller than the diameter of the first body portion (461). The first body portion (461) is placed inside the hollow portion (455) of the bobbin (451), and the second body portion (465) is placed outside the hollow portion (455).

[0129] An insertion groove (463) is formed along the axial direction in the first body portion (461) of the interlock pin (460). A movable pin (470) is inserted and installed in the insertion groove (463). The interlock pin (460) moves together with the movable pin (470). A stepped portion (464) with a small diameter is provided within the insertion groove (463).

[0130] A movable pin (470) is provided. The movable pin (470) is formed as a straight pin.

[0131] A movable pin (470) has a catch plate (472) formed protruding along the circumferential direction in the middle portion. When the movable pin (470) moves within the insertion groove (463), the catch plate (472) catches on the stepped portion (464). That is, the diameter of the catch plate (472) is formed to be larger than the diameter of the stepped portion (464) and smaller than the diameter of the insertion groove (463). One side of the catch plate (472) contacts the stepped portion (464) of the interlock pin (460).

[0132] A return spring (480) is supported on the other side of the catch plate (472).

[0133] A return spring (480) is provided. The return spring (480) is supported between the iron core (435) of the base yoke (430) and the catch plate (472) of the movable pin (470).

[0134] The return spring (480) supports the interlock pin (460), so that when the interlock pin (460) moves to the left, an elastic force is stored, and when the force of the interlock pin (460) disappears, a restoring force acts to push the interlock pin (460) to the right.

[0135] With reference to FIGS. 14 and FIGS. 15, the operation of an input interlock device according to one embodiment of the present invention will be described in detail.

[0136] FIG. 14 shows a state where the control power is not connected to the interlock insertion assembly. The interlock pin (460) is in a state where it protrudes to the right due to the force of the return spring (480). Accordingly, the interlock pin (460) is positioned on the upper part of the insertion lever (310) to restrict the operation of the insertion lever (310). Accordingly, both the operation of the insertion lever (310) by a mechanical method using the on button (251) and the operation of the insertion lever (310) by an electrical method applying current to the insertion coil (320) are restricted.

[0137] FIG. 15 shows the state in which the control power is connected to the interlock insertion assembly. When current flows through the interlock coil portion (450), a magnetic field is generated, and the interlock pin (460) is magnetized and attracted to the iron core portion (435) of the base yoke (43). The interlock pin (460) moves to the left, overcoming the force of the return spring (480). Consequently, the interlock pin (460) moves away from the upper part of the insertion lever (310) and does not restrict the operation of the insertion lever (310). Accordingly, both mechanical operation of the insertion lever (310) using the on button (251) and electrical operation of the insertion lever (310) by applying current to the insertion coil (320) are possible.

[0138] When the control power applied to the interlock insertion assembly (400) is cut off, the interlock pin (460) returns to its original position by the force of the return spring (480) and returns to a state that restricts the movement of the insertion lever (310).

[0139] According to an embodiment of the present invention, a circuit breaker closing prevention interlock device performs an interlock function for mechanical closing and an interlock function for electrical closing.

[0140] Here, since the interlock function is performed at the top of the insertion lever by the interlock coil assembly, it performs the interlock function not only for mechanical insertion by the insertion lever but also for electrical insertion resulting from the operation of the insertion coil.

[0141] Accordingly, it performs the function of fundamentally blocking the closing of the circuit breaker.

[0142] This insertion interlock function can be used independently without being linked with doors, transfer devices, or mechanical parts. In other words, it can be operated comprehensively.

[0143] In addition, since only the insertion interlock assembly is applied, the interlock device becomes simpler. The use of complex devices is reduced.

[0144] In addition, it can be applied in parallel with conventional interlock devices based on specific states. Although the device of the present invention performs a comprehensive input interlock function, since it is installed and operated separately from conventional devices, it can be used in conjunction with devices that perform interlock functions based on specific states.

[0145] The embodiments described above illustrate the best embodiments for implementing the present invention, and those skilled in the art will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, these embodiments are merely for illustrative purposes, not for limiting the technical concept of the present invention. Consequently, it should be understood that the scope of the technical concept of the present invention is not limited by these embodiments. That is, the scope of protection of the present invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention.

[0146] (Explanation of symbols)

[0147] 100 Circuit Breaker Room

[0148] 200 Circuit breaker body

[0149] 210 Blocking Section

[0150] 240 Mechanical Panel

[0151] 250 mechanical parts

[0152] 251 On button

[0153] 252 Off button

[0154] 310 insertion lever

[0155] 320 insertion coil

[0156] 330 insertion latch

[0157] 350 trip lever

[0158] 306 Trip Coil

[0159] 400 Interlock Coil Assembly

[0160] 410, 420 Interlock Bracket

[0161] 430,440 York

[0162] 450 Interlock Coil Section

[0163] 460 Interlock Pin

[0164] 470 movable pin

Claims

1. An interlock coil assembly provided in the circuit breaker body; It includes an interlock pin movably provided in the above interlock coil assembly and positioned on the upper part of the insertion lever of the mechanism, If the control power is not connected, the interlock pin interferes with the movement of the insertion lever, and An interlock device for preventing closing of a circuit breaker in which, when the control power is connected, the interlock pin moves toward the interlock coil assembly and moves away from the closing lever.

2. In Paragraph 1, The interlock coil assembly is, An interlock bracket installed on the main body of the above circuit breaker, A yoke installed on the above interlock bracket, An interlock coil part mounted on the above yoke, The interlock pin and the interlock coil portion installed to be movable along the longitudinal direction within the interlock coil portion above. An interlock device for preventing closing of a circuit breaker, comprising a movable pin inserted into the interlock pin.

3. In Paragraph 2, The above interlock bracket is, An interlock device for preventing closing of a circuit breaker, comprising a base bracket coupled to the mechanism panel of the main body of the circuit breaker and a cover bracket coupled to the base bracket.

4. In Paragraph 3, An interlock device for preventing the closing of a circuit breaker, wherein a through hole is formed in the central surface of the base bracket to allow the movable pin to be inserted and move.

5. In Paragraph 4, An interlock device for preventing closing of a circuit breaker, wherein an operating hole is formed in the central surface of the cover bracket to allow the interlock pin to be inserted and move.

6. In Paragraph 5, The above yoke is a circuit breaker interlock device comprising a base yoke installed on the base bracket and a cover yoke coupled to the base yoke.

7. In Paragraph 6, An interlock device for preventing the closing of a circuit breaker, wherein an iron core formed in a tubular shape is provided on the central surface of the base yoke.

8. In Paragraph 7, An interlock device for preventing the closing of a circuit breaker, wherein a central hole is formed in the above-mentioned core portion that communicates with the above-mentioned through hole and into which the above-mentioned movable pin is inserted.

9. In Paragraph 7, An interlock device for preventing closing of a circuit breaker, provided with a return spring between the above-mentioned iron core and the movable pin.

10. In Paragraph 6, An interlock device for preventing closing of a circuit breaker, wherein the base yoke is formed in a 'U' shape and a plurality of coupling grooves are formed at the ends of both sides of the base yoke.

11. In Paragraph 10, An interlock device for preventing closing of a circuit breaker, wherein the above-mentioned cover yoke is formed as a flat plate and a plurality of coupling protrusions are formed on both sides of the above-mentioned cover yoke to be fitted into the coupling groove.

12. In Paragraph 6, An interlock device for preventing the closing of a circuit breaker, wherein an insertion hole is formed in the central part of the cover yoke, communicating with the operating hole and into which the interlock pin is inserted.

13. In Paragraph 2, The above interlock coil part A bobbin formed in a cylindrical shape having a hollow portion and An interlock device for preventing closing of a circuit breaker, comprising a coil wound around the circumference of the above bobbin.

14. In Paragraph 13, An interlock device for preventing closing of a circuit breaker, into which the interlock pin and movable pin are inserted in the hollow portion.

15. In Paragraph 2, The above interlock pin is a circuit breaker closing prevention interlock device composed of a first body part and a second body part formed with a step.

16. In Paragraph 15, An interlock device for preventing closing of a circuit breaker, wherein an insertion groove is formed along the axial direction in the first body portion of the interlock pin, and the movable pin is inserted and installed in the insertion groove.

17. In Paragraph 9, An interlock device for preventing closing of a circuit breaker, wherein a locking plate is formed protruding along the circumferential direction in the middle portion of the above-mentioned movable pin.

18. In Paragraph 17, The above return spring is a circuit breaker interlock device that prevents closing, provided between the iron core and the locking plate.

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