Switching device

Abstract

The invention provides a switching device. The present invention addresses the problem of reliably preventing simultaneous closing of a circuit breaker and a grounding switch or a quick-action grounding switch without affecting the switching function of the circuit breaker and the grounding switch or the quick-action grounding switch even if a mechanical interlocking device is provided between the circuit breaker and the grounding switch or the quick-action grounding switch. [Solution] In order to solve the above problem, the switching device according to the present invention is provided with a circuit breaker and a grounding switch electrically connected via a connection part, and each of the circuit breaker and the grounding switch is provided with an interlocking device for cutting off a switching operation. The interlocking device of the circuit breaker and the interlocking device of the grounding switch are connected via a Bowden pull wire or push wire.

Description

Technical Field

[0001] The present invention relates to a switch device, for example, a circuit breaker (DS) and an earthing switch (ES) or a fast-acting earthing switch (FAES) suitable for use in a gas insulated switch device (GIS), each of which has a structure of an interlocking device for cutting off the switch operation. Background Art

[0002] In a gas-insulated switchgear, a circuit breaker filled with gas and surrounded by at least one metal is used. The circuit breaker is used to disconnect an electrical device from a high-voltage line so that the electrical device can be reliably and safely operated and maintained in a no-load state.

[0003] Furthermore, from the viewpoint of safety, in order to provide safer operation and maintenance, at least one grounding switch or a fast-acting grounding switch can be used together with the circuit breaker, so that capacitive current or inductive current is isolated.

[0004] In addition, in order to avoid the phase that causes the ground fault, the circuit breaker and the grounding switch or fast-acting grounding switch are not allowed to be closed at the same time.

[0005] Typically, an electrical interlocking device is provided between the circuit breaker and the earthing switch or the fast-acting earthing switch. Through the interlocking device, the current supplied to the motor driving the circuit breaker operator and the earthing switch or the fast-acting earthing switch operator is cut off, thereby interlocking the circuit breaker operator with the earthing switch or the fast-acting earthing switch operator.

[0006] For example, Patent Document 1 describes a power switch device which aims to provide a long-life mechanical interlock mechanism so that excessive stress will not be applied to the interlock mechanism even when it is rapidly operated.

[0007] In the power switch device described in the patent document 1, in order to achieve the above-mentioned purpose, there are provided: an interlocking device, which is associated with the open or closed or switching state of one of at least two mutually related switch devices, such as a circuit breaker, so as to mechanically interlock the open or closed or switching action of the other switch device, such as a fast-acting earthing switch; and a mechanical connection mechanism, which is used to connect the switch drive system of the switch device on one side and the interlocking device of the switch device on the other side, and a clearance engagement portion is provided in the middle of the mechanism including the switch drive system and the mechanical connection mechanism, and a force applying mechanism is provided in the clearance engagement portion to apply force to the switch drive system and the mechanical connection mechanism in the engagement direction at all times.

[0008] Prior Art Literature

[0009] Patent Literature

[0010] Patent Document 1: Japanese Patent Application Laid-Open No. 60-17814 Summary of the invention

[0011] Problems to be solved by the invention

[0012] In the prior art, in order to provide additional safety and avoid electrical and manual misoperation, a mechanical interlocking device is provided between the circuit breaker and the grounding switch or the fast-acting grounding switch, so that the circuit breaker and the grounding switch or the fast-acting grounding switch cannot be closed at the same time.

[0013] However, if a mechanical interlocking device is required between the circuit breaker and the earthing switch or the fast-acting earthing switch, a new mechanism that meets all the necessary conditions needs to be developed from the technical point of view and the compartment layout of the gas-insulated switchgear.

[0014] In order to introduce a mechanical interlock between an existing circuit breaker and an earthing switch or a fast-acting earthing switch, it is also important not to affect the switching functions of the circuit breaker and the earthing switch or the fast-acting earthing switch.

[0015] Patent Document 1 mentioned above does not describe any solution for solving such a problem.

[0016] The present invention is made in view of the above aspects, and its purpose is to provide a switching device that will not affect the switching functions of the circuit breaker and the grounding switch or the fast-acting grounding switch even if a mechanical interlocking device is provided between the circuit breaker and the grounding switch or the fast-acting grounding switch, and can reliably prevent both from being closed at the same time.

[0017] Means for solving problems

[0018] In order to achieve the above-mentioned object, the switch device of the present invention provides a switch device, wherein a circuit breaker and a grounding switch are electrically connected via a connecting portion, and the circuit breaker and the grounding switch are respectively provided with an interlocking device for cutting off the switch operation, characterized in that:

[0019] The interlocking device of the circuit breaker and the interlocking device of the grounding switch are connected via a Bowden pull wire or a push wire.

[0020] Effects of the Invention

[0021] According to the present invention, even if a mechanical interlocking device is provided between the circuit breaker and the grounding switch or the fast-acting grounding switch, the switching functions of the circuit breaker and the grounding switch or the fast-acting grounding switch will not be affected, and both can be reliably prevented from being closed at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a perspective view showing a schematic structure of a switch device according to a first embodiment of the present invention.

[0023] Figure 2 Yes means Figure 1 A diagram showing the connection status and internal structure of the circuit breaker and grounding switch.

[0024] Figure 3 This is a perspective view showing a state in which a circuit breaker interlocking mechanism and a grounding switch interlocking mechanism used in the first embodiment of the switchgear of the present invention are connected via a Bowden wire or a push wire.

[0025] Figure 4 It is a diagram showing the states of the circuit breaker interlock mechanism and the earthing switch interlock mechanism when the circuit breaker and the earthing switch are opened in the first embodiment of the switchgear of the present invention.

[0026] Figure 5 The diagram shows the state of the circuit breaker interlock mechanism when the circuit breaker is in the closed state and the state of the grounding switch interlock mechanism when the grounding switch is in the open state in the switchgear of the first embodiment of the present invention.

[0027] Figure 6 It is a cross-sectional view showing the circuit breaker interlock mechanism adopted in the first embodiment of the switchgear of the present invention.

[0028] Figure 7 It is a diagram showing an interlock mechanism for a grounding switch device adopted in the first embodiment of the switch device of the present invention.

[0029] Description of reference numerals:

[0030] 11…grounding switch, 11a…U-phase grounding switch, 11b…V-phase grounding switch, 11c…W-phase grounding switch, 12…circuit breaker, 12a…U-phase circuit breaker, 12b…V-phase circuit breaker, 12c…W-phase circuit breaker, 13…mechanical interlocking mechanism, 15…operator for circuit breaker, 16…operator for grounding switch, 17, 17′…first transmission shaft, 18…connecting portion, 19…movable contact of circuit breaker, 19′…movable contact of grounding switch, 20…fixed contact of circuit breaker, 20′…grounding Fixed contacts of the switch, 21…1st gear box, 22, 22′…2nd transmission shaft, 23, 23′…2nd gear box, 24…4th additional branch bus, 25…5th additional branch bus, 26…6th additional branch bus, 131…interlocking mechanism for circuit breaker, 131′…interlocking mechanism for grounding switch, 132, 133…Bowden pull or push wire, 1310, 1310′…air hole, 1311…interlocking device for circuit breaker, 1311′…interlocking device for grounding switch, 1312…interlocking device for circuit breaker cover for placement, 1312′…cover for interlocking device for grounding switch, 1313…flange for interlocking mechanism for circuit breaker, 1313′…flange for interlocking mechanism for grounding switch, 1314, 1315…first pull rod, 1316, 1317′…second pull rod, 1317…blocking rod, 1317a…gap, 1318, 1318′…trapezoidal main shaft, 1319, 1319′…trapezoidal nut, 1320…front bearing, 1321…first end bolt, 1321′…second end bolt, 1322 …guide rod, 1323, 1323′…pivot pin, 1324…coil spring, 1325…protective sealing ring, 1326…roller, 1327…rear bearing, 13111…interlocking device for circuit breaker, 13111′…interlocking device for grounding switch, 1312…cover body for interlocking device for circuit breaker, 1312′…interlocking device for grounding switch, 13112′…surface of interlocking device for grounding switch, 13171′…surface of second pull rod, 13191…U-shaped groove, 13211′…surface of trapezoidal nut. DETAILED DESCRIPTION

[0031] Hereinafter, the switch device of the present invention will be described based on the illustrated embodiment. In addition, in each figure, the same reference numerals are used for the same components.

[0032] [Example 1]

[0033] Figure 1 and Figure 2 Embodiment 1 of the switchgear of the present invention is shown. In this embodiment, the grounding switch includes a fast-acting grounding switch, and the grounding switch including the fast-acting grounding switch will be described, and the description of the fast-acting grounding switch will be omitted.

[0034] like Figure 1 As shown, the circuit breaker 12 and the grounding switch 11 are electrically connected to each other via the connecting portion 18. The circuit breaker 12 is composed of a three-phase U-phase circuit breaker 12a, a V-phase circuit breaker 12b and a W-phase circuit breaker 12c, and the grounding switch 11 is composed of a three-phase U-phase grounding switch 11a, a V-phase grounding switch 11b and a W-phase grounding switch 11c.

[0035] The three phases of the three-phase U-phase circuit breaker 12a, V-phase circuit breaker 12b and W-phase circuit breaker 12c are all of the same structure. Figure 1 Similarly, the three phases of the three-phase U-phase grounding switch 11a, the V-phase grounding switch 11b and the W-phase grounding switch 11c are all of the same structure, as shown in FIG. Figure 1 As shown, they are arranged in a row.

[0036] In addition, both the circuit breaker 12 and the earthing switch 11 can be arranged at a certain distance and in different directions in the high-voltage substation, and can be connected via various connection modules.

[0037] The circuit breaker 12 includes a circuit breaker operator 15 , and the grounding switch 11 includes a grounding switch operator 16 . The circuit breaker 12 and the grounding switch 11 can be switched via the circuit breaker operator 15 and the grounding switch operator 16 , respectively.

[0038] In addition, a mechanical interlocking mechanism 13 is provided between the circuit breaker 12 and the grounding switch 11. Each operator (circuit breaker operator 15 and grounding switch operator 16) has at least one output shaft (not shown), and the circuit breaker operator 15 and grounding switch operator 16 are directly mounted on the phases of the U-phase circuit breaker 12a and the U-phase grounding switch 11a, respectively, via the output shaft.

[0039] Thus, one of the output shafts from the circuit breaker operator 15 and the grounding switch operator 16 can be directly connected to the U-phase circuit breaker 12a and the U-phase grounding switch 11a, and the operation motion thereof can be transmitted. The second output shaft from the circuit breaker operator 15 is connected to the first transmission shaft 17 that transmits the operation motion to the V-phase circuit breaker 12b via the first gear box 21 mounted on the V-phase circuit breaker 12b.

[0040] Furthermore, the operating force of the circuit breaker operator 15 is transmitted to the first transmission shaft 17 via the first transmission shaft 17 and the second transmission shaft 22 having a smaller movement than the first transmission shaft 17, and further, the operating movement of the W-phase circuit breaker 12c is transmitted via the circuit breaker interlocking mechanism 131 connected between the first gear box 21 of the V-phase circuit breaker 12b and the second gear box 23 of the W-phase circuit breaker 12c.

[0041] In addition, as the grounding switch 11, since the configuration of the action mechanism and connection mechanism of the U-phase grounding switch 11a, the V-phase grounding switch 11b and the W-phase grounding switch 11c are the same as those of the U-phase circuit breaker 12a, the V-phase circuit breaker 12b and the W-phase circuit breaker 12c of the circuit breaker 12, the action can be transmitted using the same method as the circuit breaker 12.

[0042] Next, the interlocking function from the circuit breaker 12 to the grounding switch 11 will be described.

[0043] When the circuit breaker operator 15 is closed, the circuit breaker interlocking mechanism 131 is actuated, and the action is transmitted to the grounding switch interlocking mechanism 131' via at least one flexible Bowden wire or push wire 132 connecting the circuit breaker interlocking mechanism 131 and the grounding switch interlocking mechanism 131'.

[0044] Finally, the interlocking mechanism 131′ for the grounding switch cuts off the electrical and manual operation of the grounding switch operator 16 in order to perform the closing operation. Figure 2 As shown, the fixed contact 20 ′ of the grounding switch 11 cannot contact the movable contact 19 ′.

[0045] That is, the circuit breaker interlock mechanism 131 and the grounding switch interlock mechanism 131' can block the switch device when both of the operating mechanisms are closed, and vice versa.

[0046] Furthermore, a flexible Bowden wire or push wire 133 transmits an operation command from the grounding switch interlock mechanism 131 ′ to the circuit breaker interlock mechanism 131 .

[0047] like Figure 2 As shown, the W-phase circuit breaker 12c and the W-phase grounding switch 11c are connected to each other via a connecting portion 18, the W-phase circuit breaker 12c includes a W-phase circuit breaker movable contact 19 and a W-phase circuit breaker fixed contact 20 that are opposite to each other, and the W-phase grounding switch 11c includes a W-phase grounding switch movable contact 19′ and a W-phase grounding switch fixed contact 20′ that are opposite to each other.

[0048] In addition, the circuit breaker interlock mechanism 131 and the earthing switch interlock mechanism 131 ′ are connected via two Bowden pull wires or push wires 132 and 133 .

[0049] As described above, the W-phase circuit breaker 12c includes a W-phase circuit breaker movable contact 19 and a W-phase circuit breaker fixed contact 20 that are opposite to each other, and the W-phase grounding switch 11c includes a W-phase grounding switch movable contact 19′ and a W-phase grounding switch fixed contact 20′ that are opposite to each other, but they are further connected to the ground potential and always have a 0 potential.

[0050] The three phases (U phase, V phase, W phase) of the circuit breaker 12 and the grounding switch 11 all have movable contacts and fixed contacts, and all three phases have the same configuration. In the circuit breaker 12, the movable contact 19 for the circuit breaker is operated by the circuit breaker operator 15 to perform a switching operation with the fixed contact 20 for the circuit breaker, and in the grounding switch 11, the movable contact 19' for the grounding switch is operated by the grounding switch operator 16 to perform a switching operation with the fixed contact 20' for the grounding switch. In addition, in the connection portion 18, the grounding switch 11 and the circuit breaker 12 are electrically connected via the conductor 21, and all three phases are connected in the same way.

[0051] Figure 1 When the circuit breaker operator 15 shown performs the closing operation of the circuit breaker movable contact 19 and the circuit breaker fixed contact 20, the movement is transmitted to all three circuit breaker movable contacts 19 of the U-phase circuit breaker 12a, the V-phase circuit breaker 12b, and the W-phase circuit breaker 12c. All three circuit breaker movable contacts 19 can move toward the circuit breaker fixed contacts 20 of all three phases.

[0052] In addition, during the closing operation of the circuit breaker 12, all three phases of the three-phase U-phase grounding switch 11a, V-phase grounding switch 11b and W-phase grounding switch 11c are kept in the open state. The circuit breaker interlocking mechanism 131 connected to the W-phase circuit breaker 12c also operates during the closing operation of the circuit breaker 12, and transmits the operation to the grounding switch interlocking mechanism 131' associated with the W-phase grounding switch 11c via the Bowden pull wire or push wire 132.

[0053] Since the interlocking mechanism 131' for the grounding switch is in operation, a blocking structure is provided inside the grounding switch so as to block the second transmission shaft 22' (see Figure 1 ) and further movement of the first transmission shaft 17′.

[0054] The first transmission shaft 17′ is blocked relative to the operating device 16 for the grounding switch. Therefore, even if the internal motor (not shown) of the operating device 16 for the grounding switch is burned out, the closing action of the grounding switch 11 cannot be performed, and the movable contacts 19′ for the grounding switches of all three phases cannot move toward the fixed contacts 20′ for the grounding switch.

[0055] As such, the mechanical interlocking mechanism 13 in this embodiment can block the switch device, and vice versa.

[0056] In addition, when the mechanical interlocking mechanism 13 having the Bowden pull wire or the push wire 132 and 133 is not provided, there is no mechanical interlocking between the circuit breaker 12 and the grounding switch 11, and the circuit breaker 12 and the grounding switch 11 may both operate together, causing the current to flow from the movable contact 19 for the circuit breaker and the fixed contact 20 for the circuit breaker to the movable contact 19′ for the grounding switch and the fixed contact 20′ for the grounding switch via the conductor 21 of the connecting part 18.

[0057] Figure 3 The following diagram shows in detail a state in which the circuit breaker interlock mechanism 131 and the earthing switch interlock mechanism 131' are connected by two flexible Bowden pull or push wires 132 and 133.

[0058] The size, shape and internal structure of the circuit breaker interlocking mechanism 131 and the grounding switch interlocking mechanism 131' of both sides are the same, that is, they are of the same structure. In addition, the Bowden pull wires or push wires 132 and 133 of both sides are also of the same structure and are connected between the circuit breaker interlocking mechanism 131 and the grounding switch interlocking mechanism 131' of both sides.

[0059] The circuit breaker interlock mechanism 131 and the grounding switch interlock mechanism 131' include a circuit breaker interlock device 1311 and a grounding switch interlock device 1311', and the circuit breaker interlock mechanism 131 and the grounding switch interlock mechanism 131' include a circuit breaker interlock device cover 1312 and a grounding switch interlock device cover 1312' on both sides.

[0060] The circuit breaker interlocking device cover 1312 and the grounding switch interlocking device cover 1312 ′ are fixed to the circuit breaker interlocking mechanism 131 and the grounding switch interlocking mechanism 131 ′ via screws (not shown).

[0061] The flanges 1313 and 1313' of the circuit breaker interlocking mechanism 131 and the grounding switch interlocking mechanism 131' are fixed and fastened by at least two screws (not shown).

[0062] In addition, the circuit breaker interlocking mechanism 131 and the grounding switch interlocking mechanism 131' are provided with air holes 1310 and 1310' for air circulation, thereby avoiding the pressure difference between the inside and the outside and reducing the resistance of the mechanism.

[0063] Figure 4The states of the circuit breaker interlock mechanism 131 and the grounding switch interlock mechanism 131 ′ when the circuit breaker 12 and the grounding switch 11 are opened are shown.

[0064] The circuit breaker interlock mechanism 131 and the grounding switch interlock mechanism 131' have the same structure and respectively include first pull rods 1314 and 1315. In addition, second pull rods 1316 and 1317' are arranged near the first pull rods 1314 and 1315.

[0065] The circuit breaker interlock mechanism 131 is composed of a circuit breaker interlock device 1311 having a trapezoidal main shaft 1318 with a trapezoidal nut 1319. The trapezoidal main shaft 1318 is supported at both ends by a front bearing 1320 and a rear bearing 1327. The trapezoidal nut 1319 protrudes toward the first tie rod 1314 and is formed into a cylindrical shape so as to accommodate the roller 1326.

[0066] In addition, if the trapezoidal main shaft 1318 rotates, the trapezoidal nut 1319 can travel on the trapezoidal main shaft 1318. In order to limit the rotational movement of the trapezoidal nut 1319 and move it in a translational motion, the guide rod 1322 is set on the axis of the trapezoidal main shaft 1318 and inserted into the U-shaped groove 13191 in the trapezoidal nut 1319 (refer to Figure 6 The guide rod 1322 is installed in the interlocking device 1311 for the circuit breaker via two screws (not shown) provided at both ends.

[0067] In addition, the pivot pin 1323 holds the second pull rod 1316 and the blocking rod 1317 (see Figure 6 ), arranged to enable rotational movement about its axis.

[0068] In order to transmit the action and achieve the interlocking function, the above-mentioned Bowden pull wire or push wire 132 is provided between the second pull rod 1316 of the circuit breaker interlocking device 1311 and the second pull rod 1317' of the grounding switch interlocking mechanism 131'.

[0069] In addition, there is a first end bolt 1321 provided on the Bowden wire or push wire 132 at one end for fixing the second pull rod 1316 of the circuit breaker interlocking mechanism 131, and a second end bolt 1321' provided on the Bowden wire or push wire 132 at the other end for fixing the second pull rod 1317' of the grounding switch interlocking mechanism 131'. The first and second end bolts 1321 and 1321' on both sides of the Bowden wire or push wire 132 can fix the associated rods using hexagonal nuts.

[0070] Furthermore, in order to hold the second pull rod 1317' of the grounding switch interlock mechanism 131' at the unlocked position, a coil spring 1324 is provided for always compressing the second pull rod 1317' toward the grounding switch interlock device 1311'.

[0071] Figure 5 It represents the linkage mechanism between the circuit breaker 12 and the grounding switch 11. That is, Figure 5 The state of the circuit breaker interlock mechanism 131 when the circuit breaker 12 is in the closed state and the state of the grounding switch interlock mechanism 131 ′ when the grounding switch 11 is in the open state are shown.

[0072] First, if Figure 1 When a closing command is applied to the circuit breaker operator 15 shown in FIG. 1 , the trapezoidal main shaft 1318 rotates, and the trapezoidal nut 1319 moves from the disconnected position located at the center of the trapezoidal main shaft 1318 toward the opposite side of the flange 1313 of the circuit breaker interlocking mechanism 131 ( Figure 5 Then, the roller 1326 disposed in the trapezoidal nut 1319 rotates, moves on the inclined surface 13161 formed by the second pull rod 1316 of the circuit breaker interlocking device 1311, and presses the second pull rod 1316 of the circuit breaker interlocking device 1311 to rotate in the clockwise direction.

[0073] Furthermore, when the second pull rod 1316 of the circuit breaker interlock 1311 rotates, the first end bolt 1321 of the arcuate Bowden cable or push wire 132 is pulled, and the arcuate Bowden cable or push wire 132 is pulled.

[0074] Therefore, the second pull rod 1317 ′ of the earthing switch device interlock mechanism 131 ′ is also pulled by the second end bolt 1321 ′ of the Bowden wire or push wire 132 connected thereto.

[0075] In this state, the second pull rod 1317' of the grounding switch interlock mechanism 131' is parallel to the circuit breaker interlock device 13111, which is the disconnection position of the rod.

[0076] In addition, the coil spring 1324 is Figure 5 As shown in FIG. 1 , the coil spring 1324 is compressed and assembled in the Bowden wire or push wire 132 and is arranged between the second pull rod 1317 ′ of the interlocking mechanism 131 ′ for the grounding switch and the interlocking device 1311 for the circuit breaker.

[0077] In this state, if Figure 1When a closing command is applied to the grounding switch operator 16 shown, the trapezoidal main shaft 1318' of the grounding switch interlocking mechanism 131' is rotated, and then the trapezoidal nut 1319' is moved toward the opposite side of the flange 1313' of the grounding switch interlocking mechanism 131'.

[0078] However, the second pull rod 1317′ of the interlocking mechanism 131′ for the grounding switch is in the blocking position. If the trapezoidal nut surface 13211′ contacts the second pull rod surface 13171′ of the interlocking mechanism 131′ for the grounding switch, the trapezoidal nut 1319′ cannot move toward the opposite side of the flange 1313′ of the interlocking mechanism 131′ for the grounding switch.

[0079] In this state, since the trapezoidal nut 1319' is blocked and blocks further rotational movement of the trapezoidal main shaft 1318' of the grounding switch interlocking mechanism 131', the motor of the grounding switch operator 16 generates the maximum torque for the motor to perform the closing action.

[0080] The motor of the grounding switch operator 16 is capable of generating a maximum torque, which can be transmitted to the second tie rod 1317′ of the grounding switch interlocking mechanism 131′ via the second end bolt 1321′, and further, to the pivot pin 1323′, the same force as the second tie rod 1317′ of the grounding switch interlocking mechanism 131′ on which it is assembled, and can rotate around its axis.

[0081] In order to transmit the above-mentioned greater force to the grounding switch interlocking device 1311 ′, as Figure 7 As shown, a stop portion is provided between the second pull rod surface 13171' of the grounding switch interlock mechanism 131' and the surface 13112' of the grounding switch interlock device 1311'.

[0082] In order to ensure reliable contact between the second pull rod surface 13171' of the grounding switch interlocking mechanism 131' and the surface 13112' of the grounding switch interlocking device 1311', a gap 1317a is provided between the pivot pin 1323' and the second pull rod 1317' of the grounding switch interlocking mechanism 131'.

[0083] exist Figure 5In the interlocking shown, the second pull rod 1317′ of the interlocking mechanism 131′ for the grounding switch slides slightly in the opposite direction of the flange 1313′ of the interlocking mechanism 131′ for the grounding switch until it contacts the surface 13112′ of the interlocking device 1311′ for the grounding switch. By having a stop portion in the second pull rod 1317′ of the interlocking mechanism 131′ for the grounding switch, the pivot pin 1323′ does not contact the second pull rod 1317′ of the interlocking mechanism 131′ for the grounding switch.

[0084] Therefore, there is always a gap 1317a between the pivot pin 1323' and the second tie rod 1317' of the earthing switch device interlocking mechanism 131'.

[0085] Furthermore, even if the grounding switch interlock mechanism 131 ′ is completely heated and burned, the grounding switch 11 cannot be closed.

[0086] This is because, although the interlocking mechanism from the circuit breaker 12 to the grounding switch 11 is described above, the interlocking mechanism from the grounding switch 11 to the circuit breaker 12 has the same structure as the interlocking mechanism 131 for the circuit breaker and the interlocking mechanism 131' for the grounding switch, and therefore functions in the same manner as the interlocking mechanism from the circuit breaker 12 to the grounding switch 11.

[0087] Figure 6 A cross section of the circuit breaker interlock mechanism 131 is shown.

[0088] like Figure 6 As shown, the circuit breaker interlock mechanism 131 has a pivot pin 1323 provided in the circuit breaker interlock device 1311, and rotates with the axis of the pivot pin 1323 as a reference so as to pull the second pull rod 1316 and the second pull rod 1317 of the circuit breaker interlock device 1311.

[0089] In order to reduce friction and avoid wear between the surfaces of the second pull rods 1316 and 1317 of the circuit breaker interlocking device 1311 and the surface of the circuit breaker interlocking device 1311, a thrust washer 1328 is provided in the pivot pin 1323. In addition, a protective seal ring 1325 is provided on the entire surface and both sides of the circuit breaker interlocking mechanism 131 to protect against dust and water ingress. The same is true for the grounding switch interlocking mechanism 131'.

[0090] Therefore, according to this embodiment, even if a mechanical interlocking device is provided between the circuit breaker 12 and the grounding switch (including a fast-acting grounding switch) 11, the switching functions of the circuit breaker 12 and the grounding switch 11 will not be affected, and both can be reliably prevented from being closed at the same time.

[0091] In addition, the present invention is not limited to the above-mentioned embodiments, and includes various modified examples. For example, the above-mentioned embodiments are described in detail to make the present invention easy to understand, but are not limited to having all the described structures. In addition, a part of the structure of a certain embodiment can be added to the structure of other embodiments. In addition, with respect to a part of the structure of each embodiment, other structures can also be added / deleted / replaced.

Claims

1. A switch device, wherein a circuit breaker and a grounding switch are electrically connected via a connecting portion, wherein the circuit breaker and the grounding switch are respectively provided with an interlocking device for cutting off a switch operation, wherein: The interlocking device of the circuit breaker and the interlocking device of the grounding switch are connected via a Bowden pull wire or a push wire.

2. The switch device according to claim 1, characterized in that The circuit breaker is composed of a U-phase circuit breaker, a V-phase circuit breaker and a W-phase circuit breaker, and the grounding switch is composed of a U-phase grounding switch, a V-phase grounding switch and a W-phase grounding switch. The three phases of the U-phase circuit breaker, the V-phase circuit breaker and the W-phase circuit breaker are all of the same structure and are arranged in a row with each other. Furthermore, the three phases of the U-phase grounding switch device, the V-phase grounding switch device, and the W-phase grounding switch device all have the same structure and are arranged in a row with each other.

3. The switch device according to claim 2, characterized in that: The circuit breaker includes a circuit breaker operator, and the grounding switch includes a grounding switch operator. The circuit breaker and the grounding switch are respectively operated by the circuit breaker operator and the grounding switch operator. A mechanical interlocking mechanism is provided between the circuit breaker and the grounding switch.

4. The switch device according to claim 3, characterized in that The three phases of the circuit breaker and the grounding switch, namely the U phase, the V phase, and the W phase, all have movable contacts and fixed contacts. In the circuit breaker, the movable contact of each phase is operated by the circuit breaker operating device to perform switching operations with the fixed contacts of each phase, and in the grounding switch, the movable contact of each phase is operated by the grounding switch operating device to perform switching operations with the fixed contacts of each phase.

5. The switch device according to claim 4, characterized in that The circuit breaker operator and the grounding switch operator have at least one output shaft, and are attached to the circuit breaker of each phase and the grounding switch of each phase via the output shaft.

6. The switch device according to claim 5, characterized in that One of the output shafts from the circuit breaker operator and the earthing switch operator is connected to one of the phases of the U-phase circuit breaker and the U-phase earthing switch, and the second output shaft from the circuit breaker operator and the earthing switch operator is connected to the first transmission shaft that transmits motion to the V-phase circuit breaker and the V-phase earthing switch via the first gear box installed on the V-phase circuit breaker and the V-phase earthing switch. Furthermore, the motion is transmitted to the W-phase circuit breaker and the W-phase grounding switch via the second transmission shaft having a smaller motion than the first transmission shaft, and the motion is transmitted via the circuit breaker interlocking mechanism and the grounding switch interlocking mechanism between the first gear box connected to the V-phase circuit breaker and the V-phase grounding switch and the second gear box of the W-phase circuit breaker and the W-phase grounding switch.

7. The switch device according to claim 6, characterized in that When the circuit breaker operator performs a closing operation, the circuit breaker interlock mechanism is actuated, and the operation is transmitted to the grounding switch interlock mechanism via the Bowden pull wire or the push wire connecting the circuit breaker interlock mechanism and the grounding switch interlock mechanism.

8. The switch device according to claim 7, characterized in that The circuit breaker interlocking mechanism and the grounding switch interlocking mechanism have the same structure, and the Bowden pull wire or push wire also has the same structure. The Bowden pull wire or push wire connects the circuit breaker interlocking mechanism and the grounding switch interlocking mechanism.

9. The switch device according to claim 8, characterized in that The interlocking mechanism for the circuit breaker includes an interlocking device for the circuit breaker, the interlocking mechanism for the grounding switch includes an interlocking device for the grounding switch, the interlocking mechanism for the circuit breaker and the interlocking mechanism for the grounding switch include a cover for the interlocking device for the circuit breaker and a cover for the interlocking device for the grounding switch on both sides, and The circuit breaker interlock device cover and the grounding switch interlock device cover are fixed to the circuit breaker interlock mechanism and the grounding switch interlock mechanism via screws.

10. The switch device according to claim 9, characterized in that The circuit breaker interlocking mechanism and the grounding switch interlocking mechanism are provided with air holes for air circulation.

11. The switch device according to claim 10, characterized in that The circuit breaker interlocking mechanism and the grounding switch interlocking mechanism each have a first pull rod, and a second pull rod is arranged near the first pull rod. The circuit breaker interlocking mechanism comprises a trapezoidal main shaft having a trapezoidal nut supported at both ends by a front bearing and a rear bearing, and the trapezoidal nut protrudes toward the first tie rod and is formed into a cylindrical shape so as to accommodate a roller.

12. The switch device according to claim 11, characterized in that If the trapezoidal spindle rotates, the trapezoidal nut travels on the trapezoidal spindle, and a guide rod for limiting the rotational movement of the trapezoidal nut and moving it in a translational motion is provided on the axis of the trapezoidal spindle and is inserted into a U-shaped groove formed in the trapezoidal nut, The guide rod is mounted in the circuit breaker interlocking mechanism via two screws provided at both ends, and a pivot pin for holding the second pull rod and the blocking rod, respectively, is provided so as to be rotatable about its axis.

13. The switch device according to claim 12, characterized in that The switch device comprises: a first end bolt provided on the Bowden pull wire or the push wire for fixing one end of the second pull rod of the interlocking mechanism for the circuit breaker; And the second end bolt is arranged on the Bowden pull wire or push wire at the other end for fixing the second pull rod of the interlocking mechanism of the grounding switch, and the first end bolt and the second end bolt on both sides of the Bowden pull wire or push wire are fixed to the rod using hexagonal nuts.

14. The switch device according to claim 13, characterized in that In order to hold the second pull rod of the grounding switch interlock mechanism at the unlocked position, a coil spring is provided for always compressing the second pull rod toward the grounding switch interlock mechanism.

15. The switch device according to claim 14, characterized in that A gap is provided between the pivot pin and the second pull rod of the earthing switch device interlocking mechanism.

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