Switchgear

Abstract

To reliably prevent a disconnect device and an earthing switch or a high-speed operation earthing switch from being closed at the same time without affecting the switch functions of the disconnect device and the earthing switch or high-speed operation earthing switch even when a mechanical interlock device is installed therebetween.SOLUTION: A switchgear includes a disconnect device and an earthing switch electrically connected to each other via a connection portion, and each of the disconnect device and the earthing switch is provided with an interlock device configured to block switching operations. The interlock device of the disconnect device and the interlock device of the earthing switch are connected via a Bowden pull cable or a push cable.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a switchgear, and more particularly to a switchgear suitable for, for example, a gas-insulated switchgear (GIS) in which a disconnecting switch (DS) and an earthing switch (ES) or a fast-acting earthing switch (FAES) are each provided with an interlock device that blocks switching operations. [Background technology]

[0002] Gas-insulated switchgear uses at least one metal-enclosed disconnector filled with gas to disconnect electrical equipment from high-voltage lines to ensure safe operation and maintenance of the electrical equipment when not under load.

[0003] Also, from a safety point of view, in order to provide safer operation and maintenance, at least one earthing switch or fast acting earthing switch may be used together with the disconnector, so that capacitive or inductive currents are isolated.

[0004] However, to avoid a phase to earth fault, the disconnector and the earthing switch or fast acting earthing switch are not allowed to be closed at the same time.

[0005] Normally, an electrical interlock device is installed between the disconnector and the earthing switch or the fast-acting earthing switch, and this interlock device cuts off the current supply to the motors that drive the disconnector operator and the earthing switch or the fast-acting earthing switch operator, thereby interlocking the disconnector operator and the earthing switch or the fast-acting earthing switch operator.

[0006] For example, Patent Document 1 describes an electric power switchgear that is provided with a long-life mechanical interlock mechanism in which excessive stress is not applied to the interlock device even during high-speed operation.

[0007] In order to achieve the above-mentioned objective, the electric power switchgear described in Patent Document 1 is provided with an interlock device that mechanically interlocks the opening or closing or opening / closing operation of one of at least two mutually related switches, for example, a high-speed action earthing switchgear, in relation to the opening or closing or opening / closing state of the other switchgear, for example, a circuit breaker, and a mechanical coupling mechanism for coupling the opening / closing drive system of one of the switches and the interlock device of the other switchgear, and a play engagement portion is provided in the middle of the mechanism including the opening / closing drive system and the mechanical coupling mechanism, and a biasing means is provided in this play engagement portion for constantly biasing the opening / closing drive system and the mechanical coupling mechanism in the engagement direction. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 17814 / 1983 Summary of the Invention [Problem to be solved by the invention]

[0009] In the prior art, to provide additional safety and avoid erroneous electrical and manual operation, a mechanical interlock device is provided between the disconnector and the earthing switch or fast-acting earthing switch, so that both the disconnector and the earthing switch or fast-acting earthing switch cannot be closed at the same time.

[0010] However, considering that a mechanical interlocking device is required between the disconnector and the earthing switch or fast-acting earthing switch, a new mechanism needs to be developed to meet all the requirements in terms of technical and gas-insulated switchgear bay layout.

[0011] It is also important that the switching functions of the disconnector and earthing switch or fast-acting earthing switch must not be affected in order to introduce a mechanical interlocking device between the existing disconnector and earthing switch or fast-acting earthing switch.

[0012] The above-mentioned Patent Document 1 does not disclose any solution to solve such problems.

[0013] The present invention has been made in consideration of the above points, and an object of the present invention is to provide a switchgear that can reliably prevent the disconnector and the earthing switch or the fast-acting earthing switch from being closed simultaneously, without affecting the switch functions of the disconnector and the earthing switch or the fast-acting earthing switch, even if a mechanical interlock device is installed between them. [Means for solving the problem]

[0014] In order to achieve the above object, the switchgear of the present invention is a switchgear in which a disconnector and a grounding switch are electrically connected via a connection part, and the disconnector and the grounding switch are each provided with an interlock device that blocks switching operations, The interlock device of the disconnector and the interlock device of the earthing switch are connected via a Bowden pull cable or a push cable. [Effects of the Invention]

[0015] According to the present invention, even if a mechanical interlock device is installed between the disconnector and the earthing switch or the fast-acting earthing switch, it is possible to reliably prevent both from being closed at the same time without affecting the switch functions of the disconnector and the earthing switch or the fast-acting earthing switch. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a perspective view showing a schematic configuration of a first embodiment of a switching device according to the present invention. [Figure 2] 2 is a diagram showing an outline of the connection state and internal structure of the disconnector and earthing switch in FIG. 1.

[0023] FIG. [Figure 3]FIG. 2 is a perspective view showing a state in which a disconnector interlock mechanism and a grounding switch interlock mechanism employed in a switchgear according to a first embodiment of the present invention are connected by a Bowden pull cable or a push cable. [Figure 4] 4A and 4B are diagrams illustrating the states of the disconnector interlock mechanism and the earthing switch interlock mechanism when the disconnector and earthing switch are open in the switchgear according to the first embodiment of the present invention. [Figure 5] 1A and 1B are diagrams illustrating a state of a disconnector interlock mechanism when the disconnector is in a closed state and a state of a grounding switch interlock mechanism when the grounding switch is in an open state in a switchgear according to a first embodiment of the present invention. [Figure 6] 1 is a cross-sectional view showing an interlock mechanism for a disconnector employed in a first embodiment of a switchgear according to the present invention. [Figure 7] 1 is a diagram showing an interlock mechanism for a grounding switch employed in a switchgear according to a first embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0017] The opening and closing device of the present invention will be described below based on the illustrated embodiments. In each drawing, the same reference numerals are used for the same components. [Example]

[0018] 1 and 2 show a first embodiment of a switchgear according to the present invention. In this embodiment, the earthing switch includes a fast-acting earthing switch, and the description will be given as an earthing switch including a fast-acting earthing switch, and a description of the fast-acting earthing switch will be omitted.

[0019] As shown in FIG. 1, the disconnector 12 and the earthing switch 11 are electrically connected to each other via a connection part 18, and the disconnector 12 consists of a three-phase U-phase disconnector 12a, a V-phase disconnector 12b, and a W-phase disconnector 12c, while the earthing switch 11 consists of a three-phase U-phase earthing switch 11a, a V-phase earthing switch 11b, and a W-phase earthing switch 11c.

[0020] The three phases of the U-phase disconnector 12a, the V-phase disconnector 12b, and the W-phase disconnector 12c all have the same configuration and are arranged in a row as shown in Fig. 1. Similarly, the three phases of the U-phase earthing switch 11a, the V-phase earthing switch 11b, and the W-phase earthing switch 11c all have the same configuration and are arranged in a row as shown in Fig. 1.

[0021] Furthermore, both the disconnecting switches 12 and the earthing switches 11 described above can be arranged in different orientations at a certain distance within the high voltage substation and connected via various connection modules.

[0022] In addition, the disconnector 12 is provided with a disconnector operating device 15, and the earthing switch 11 is provided with a earthing switch operating device 16, and the disconnector 12 and the earthing switch 11 can be opened and closed via the disconnector operating device 15 and the earthing switch operating device 16, respectively.

[0023] A mechanical interlock mechanism 13 is provided between the disconnector 12 and the earthing switch 11. Each of the operating devices (disconnector operating device 15 and earthing switch operating device 16) has at least one output shaft (not shown), and the disconnector operating device 15 and the earthing switch operating device 16 are directly attached to the phases of the U-phase disconnector 12a and the U-phase earthing switch 11a, respectively, via the output shaft.

[0024] This allows one of the output shafts from the disconnector operator 15 and the earthing switch operator 16 to be directly connected to the U-phase disconnector 12a and the U-phase earthing switch 11a to transmit the operating motion thereof. The second output shaft from the disconnector operator 15 is connected to a first transmission shaft 17 that transmits the operating motion to the V-phase disconnector 12b via a first gearbox 21 attached to the V-phase disconnector 12b.

[0025] Furthermore, the operating force of the disconnector operating device 15 is transmitted to the first transmission shaft 17 via the first transmission shaft 17 and a second transmission shaft 22 having smaller movement than the first transmission shaft 17, and further, the operating movement of the W-phase disconnector 12c is transmitted via a disconnector interlock mechanism 131 connected between the first gear box 21 of the V-phase disconnector 12b and the second gear box 23 of the W-phase disconnector 12c.

[0026] In addition, since the arrangement of the operating mechanisms and link mechanisms of the U-phase earthing switch 11a, V-phase earthing switch 11b, and W-phase earthing switch 11c of the earthing switch 11 is the same as that of the U-phase earthing switch 12a, V-phase earthing switch 12b, and W-phase earthing switch 12c of the disconnector 12, the operation can be transmitted in the same manner as that of the disconnector 12.

[0027] Next, the interlocking function from the disconnector 12 to the earthing switch 11 will be described.

[0028] When the disconnector operating device 15 performs a closing operation, the disconnector interlock mechanism 131 operates and transmits the operation to the earthing switch interlock mechanism 131' via at least one flexible Bowden pull cable or push cable 132 connecting the disconnector interlock mechanism 131 and the earthing switch interlock mechanism 131'.

[0029] Finally, in order to perform the closing operation, the earthing switch interlock mechanism 131' cuts off the electrical and manual operation of the earthing switch operating device 16. Because the earthing switch operating device 16 has performed the closing operation (cut off), the fixed contact 20' and the movable contact 19' of the earthing switch 11 cannot come into contact with each other, as shown in FIG.

[0030] That is, both the disconnector interlock mechanism 131 and the earthing switch interlock mechanism 131' can block the switchgear when the operating mechanism is closed, and vice versa.

[0031] A flexible Bowden pull cable or push cable 133 transmits an operation command from the earthing switch interlock mechanism 131' to the disconnector interlock mechanism 131.

[0032] As shown in Figure 2, the W-phase disconnector 12c and the W-phase earthing switch 11c are connected to each other via a connection part 18, and the W-phase disconnector 12c has a W-phase disconnector movable contact 19 and a W-phase disconnector fixed contact 20 facing each other, and the W-phase earthing switch 11c has a W-phase earthing switch movable contact 19' and a W-phase earthing switch fixed contact 20' facing each other.

[0033] The disconnector interlock mechanism 131 and the earthing switch interlock mechanism 131' are connected via two Bowden pull cables or push cables 132 and 133.

[0034] As described above, the W-phase disconnector 12c has a W-phase disconnector movable contact 19 and a W-phase disconnector fixed contact 20 facing each other, and the W-phase earthing switch 11c has a W-phase earthing switch movable contact 19' and a W-phase earthing switch fixed contact 20' facing each other, which are further connected to ground potential and are always at zero potential.

[0035] The three phases (U-phase, V-phase, W-phase) of the disconnector 12 and earthing switch 11 all have movable contacts and fixed contacts, and all three phases have the same arrangement configuration, and the disconnector 12 has a disconnector movable contact 19 operated by a disconnector operating device 15 to perform an opening and closing operation with the disconnector fixed contact 20, and the earthing switch 11 has a earthing switch movable contact 19' operated by a earthing switch operating device 16 to perform an opening and closing operation with the earthing switch fixed contact 20'. Also, at a connection part 18, the earthing switch 11 and the disconnector 12 are electrically connected via a conductor 21, and all three phases are connected in the same manner.

[0036] 1 transmits motion to all three of the disconnector movable contacts 19 of the U-phase disconnector 12a, the V-phase disconnector 12b, and the W-phase disconnector 12c when a closing operation is performed on the disconnector movable contacts 19 and the disconnector fixed contacts 20. All three disconnector movable contacts 19 can move toward the disconnector fixed contacts 20 of all three phases.

[0037] Furthermore, during the above-described closing operation of the disconnector 12, all three phases, namely the U-phase earthing switch 11a, the V-phase earthing switch 11b, and the W-phase earthing switch 11c, remain in the open state. The disconnector interlock mechanism 131 connected to the W-phase disconnector 12c operates even during the closing operation of the disconnector 12, and the operation is transmitted to the earthing switch interlock mechanism 131' associated with the W-phase earthing switch 11c via a Bowden pull cable or a push cable 132.

[0038] Since the interlock mechanism 131' for the earthing switch is activated, it has an internal blocking structure that can block further movement of the second transmission shaft 22' (see Figure 1), which has smaller movement than the first transmission shaft 17', and the first transmission shaft 17'.

[0039] Since the above-mentioned first transmission shaft 17' is blocked from the operating earthing switch operating device 16, even if the motor (not shown) inside the earthing switch operating device 16 burns out, the earthing switch 11 cannot be closed, and the earthing switch movable contacts 19' for all three phases cannot move toward the earthing switch fixed contacts 20'.

[0040] Thus, the mechanical interlock mechanism 13 in this embodiment can block the opening and closing device and vice versa.

[0041] If the mechanical interlock mechanism 13 equipped with Bowden pull cables or push cables 132 and 133 is not provided, there is no mechanical interlock between the disconnector 12 and the earthing switch 11, and both the disconnector 12 and the earthing switch 11 may operate at the same time, causing current to flow from the disconnector movable contact 19 and the disconnector fixed contact 20 to the earthing switch movable contact 19' and the earthing switch fixed contact 20' via the conductor 21 of the connection part 18.

[0042] FIG. 3 shows in detail how the disconnector interlock mechanism 131 and the earthing switch interlock mechanism 131 ′ are connected by two flexible Bowden pull or push cables 132 and 133 .

[0043] Both the disconnector interlock mechanisms 131 and the earthing switch interlock mechanism 131' have the same size, shape and internal structure, i.e., they have the same configuration. In addition, both Bowden pull cables or push cables 132 and 133 also have the same configuration and are connected between both the disconnector interlock mechanisms 131 and the earthing switch interlock mechanism 131'.

[0044] The disconnector interlock mechanism 131 and the earthing switch interlock mechanism 131' are provided with a disconnector interlock device 1311 and an earthing switch interlock device 1311', and the disconnector interlock mechanism 131 and the earthing switch interlock mechanism 131' are provided with a disconnector interlock device cover 1312 and an earthing switch interlock device cover 1312' on both sides.

[0045] The disconnector interlock device cover 1312 and the earthing switch interlock device cover 1312' are fixed to the disconnector interlock mechanism 131 and the earthing switch interlock mechanism 131' via screws (not shown).

[0046] In addition, the flanges 1313 and 1313' sides of the disconnector interlock mechanism 131 and the earthing switch interlock mechanism 131' are fastened to the second gear box 23 of the W-phase disconnector 12c and the second gear box 23' of the W-phase earthing switch 11c by fixing them through at least two screws (not shown).

[0047] In addition, the disconnector interlock mechanism 131 and the earthing switch interlock mechanism 131' are provided with air holes 1310 and 1310' for air circulation, which avoids a pressure difference between the inside and outside and reduces the resistance of the mechanism.

[0048] FIG. 4 shows the state of the disconnector interlock mechanism 131 and the earthing switch interlock mechanism 131' when the disconnector 12 and the earthing switch 11 are open.

[0049] The disconnector interlock mechanism 131 and the earthing switch interlock mechanism 131' have the same configuration, and each has a first pull lever 1314 and 1315. Second pull levers 1316 and 1317' are also disposed near the first pull levers 1314 and 1315.

[0050] The disconnector interlock mechanism 131 is composed of a disconnector interlock device 1311 having a trapezoidal spindle 1318 equipped with a trapezoidal nut 1319. The trapezoidal spindle 1318 is supported at both ends by a front bearing 1320 and a rear bearing 1327. The trapezoidal nut 1319 protrudes toward the first pull lever 1314 and has a cylindrical shape so that the roller 1326 can be accommodated therein.

[0051] Furthermore, as the trapezoidal spindle 1318 rotates, the trapezoidal nut 1319 can run on the trapezoidal spindle 1318. In order to limit the rotational movement of the trapezoidal nut 1319 and convert it into translational movement, a guide rod 1322 is provided on the axis of the trapezoidal spindle 1318 and inserted into a U-shaped groove 13191 (see Figure 6) in the trapezoidal nut 1319. This guide rod 1322 is attached to the disconnector interlock device 1311 via two screws (not shown) provided on both ends.

[0052] The pivot pin 1323 also holds the second pull lever 1316 and the block lever 1317 (see FIG. 6), respectively, and is provided so as to be capable of rotational movement around its axis.

[0053] In addition, in order to transmit the operation and achieve the interlock function, the above-mentioned Bowden pull cable or push cable 132 is provided between the second pull lever 1316 of the disconnector interlock device 1311 and the second pull lever 1317' of the earthing switch interlock mechanism 131'.

[0054] The Bowden pull cable or push cable 132 also has a first end bolt 1321 attached to one end thereof for securing the second pull lever 1316 of the disconnector interlock mechanism 131, and a second end bolt 1321' attached to the other end thereof for securing the second pull lever 1317' of the earthing switch interlock mechanism 131'. The first and second end bolts 1321 and 1321' on either side of the Bowden pull cable or push cable 132 can secure the associated levers using hex nuts.

[0055] In addition, in order to keep the second pull lever 1317' of the earthing switch interlock mechanism 131' in the unblocked position, a spiral spring 1324 is provided which constantly compresses the second pull lever 1317' toward the earthing switch interlock device 13111'.

[0056] Fig. 5 shows the interlocking mechanism between the disconnector 12 and the earthing switch 11. That is, Fig. 5 shows the state of the disconnector interlock mechanism 131 when the disconnector 12 is in the closed state, and the state of the earthing switch interlock mechanism 131' when the earthing switch 11 is in the open state.

[0057] First, when a close command is given to the disconnector operating device 15 shown in Fig. 1, the trapezoidal spindle 1318 rotates, and the trapezoidal nut 1319 moves from the open position in the center of the trapezoidal spindle 1318 toward the opposite side (upper side in Fig. 5) of the flange 1313 of the disconnector interlock mechanism 131. Then, the roller 1326 provided inside the trapezoidal nut 1319 rotates, travels on the inclined surface 13161 formed on the second pull lever 1316 of the disconnector interlock device 1311, and pushes the second pull lever 1316 of the disconnector interlock device 1311, causing it to rotate clockwise.

[0058] Additionally, when the second pull lever 1316 of the disconnector interlock device 1311 rotates, it pulls the first end bolt 1321 of the arcuate Bowden pull or push cable 132, causing the arcuate Bowden pull or push cable 132 to be pulled.

[0059] As a result, the second pull lever 1317' of the earthing switch interlock mechanism 131' is also pulled from the second end bolt 1321' of the Bowden pull cable or push cable 132 connected thereto.

[0060] In this state, the second pull lever 1317' of the earthing switch interlock mechanism 131' is parallel to the disconnector interlock device 13111, which is the open position of the lever.

[0061] Also, the helical spring 1324 is compressed as shown in FIG. 5, and the helical spring 1324 is assembled into the Bowden pull cable or push cable 132 and disposed between the second pull lever 1317′ of the earthing switch interlock mechanism 131′ and the disconnector interlock device 1311.

[0062] In this state, when a close command is given to the earthing switch operating device 16 shown in Figure 1, it attempts to rotate the trapezoidal spindle 1318' of the earthing switch interlock mechanism 131', and also attempts to move the trapezoidal nut 1319' toward the opposite side of the flange 1313' of the earthing switch interlock mechanism 131'.

[0063] However, when the second pull lever 1317' of the grounding switch interlock mechanism 131' is in a blocking position and the trapezoidal nut surface 13211' contacts the second pull lever surface 13171' of the grounding switch interlock mechanism 131', it does not allow the trapezoidal nut 1319' to move toward the opposite side of the flange 1313' of the grounding switch interlock mechanism 131'.

[0064] In this situation, the motor of the earthing switch operator 16 generates maximum torque to perform the closing operation by the motor, as the trapezoidal nut 1319' is blocked and blocks further rotational movement of the trapezoidal spindle 1318' of the earthing switch interlock mechanism 131'.

[0065] The motor of the earthing switch operator 16 can generate maximum torque, which can be transmitted on the second pull lever 1317' of the earthing switch interlock mechanism 131' via the second end bolt 1321', and further, on the pivot pin 1323', the same force as the second pull lever 1317' of the earthing switch interlock mechanism 131' assembled therewith can be transmitted and rotated around its axis.

[0066] In order to transmit the above-mentioned higher force to the earthing switch interlock device 1311', a stop portion is provided between the second pull lever surface 13171' of the earthing switch interlock mechanism 131' and the surface 13112' of the earthing switch interlock device 1311', as shown in Figure 7.

[0067] To ensure contact between the second pull lever surface 13171' of the above-mentioned earthing switch interlock mechanism 131' and the surface 13112' of the earthing switch interlock device 1311', a gap 1317a is provided between the pivot pin 1323' and the second pull lever 1317' of the earthing switch interlock mechanism 131'.

[0068] During the interlocking shown in FIG. 5, the second pull lever 1317' of the grounding switch interlock mechanism 131' slides slightly in the opposite direction of the flange 1313' of the grounding switch interlock mechanism 131' until it contacts the surface 13112' of the grounding switch interlock device 1311', and due to the presence of a stop portion within the second pull lever 1317' of the grounding switch interlock mechanism 131', the pivot pin 1323' does not contact the second pull lever 1317' of the grounding switch interlock mechanism 131'.

[0069] Therefore, a gap 1317a always exists between the pivot pin 1323' and the second pull lever 1317' of the earthing switch interlock mechanism 131'.

[0070] Furthermore, even if the earthing switch interlock mechanism 131' is completely heated and burned out, the earthing switch 11 cannot be closed.

[0071] This is because, although the interlock mechanism from the disconnector 12 to the earthing switch 11 has been described above, the interlock from the earthing switch 11 to the disconnector 12 functions in the same way as the interlock mechanism from the disconnector 12 to the earthing switch 11, since the disconnector interlock mechanism 131 and the earthing switch interlock mechanism 131' have the same configuration.

[0072] FIG. 6 shows a cross section of the disconnector interlock mechanism 131.

[0073] As shown in FIG. 6, the disconnector interlock mechanism 131 has a pivot pin 1323 provided in the disconnector interlock device 1311, and rotates around the axis of this pivot pin 1323 so as to pull the second pull lever 1316 and the second pull lever 1317 of the disconnector interlock device 1311.

[0074] A thrust washer 1328 is provided within the pivot pin 1323 to reduce friction and prevent wear between the surfaces of the second pull levers 1316 and 1317 of the disconnector interlock device 1311 and the surface of the disconnector interlock device 1311. Protective seal rings 1325 for dust prevention and water intrusion protection are provided on the entire surface and both sides of the disconnector interlock mechanism 131. The same is true for the earthing switch interlock mechanism 131'.

[0075] Therefore, according to this embodiment, even if a mechanical interlock device is installed between the disconnector 12 and the earthing switch (including a fast-acting earthing switch) 11, it is possible to reliably prevent both from closing simultaneously without affecting the switch functions of the disconnector 12 and the earthing switch 11.

[0076] The present invention is not limited to the above-described embodiments, but includes various modifications. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to those including all of the described configurations. Furthermore, it is possible to add a portion of the configuration of one embodiment to the configuration of another embodiment. Furthermore, it is possible to add, delete, or replace a portion of the configuration of each embodiment with another configuration. [Explanation of symbols]

[0077] 11...earthing switch, 11a...U-phase earthing switch, 11b...V-phase earthing switch, 11c...W-phase earthing switch, 12...disconnector, 12a...U-phase disconnector, 12b...V-phase disconnector, 12c...W-phase disconnector, 13...mechanical interlock mechanism, 15...disconnector operating device, 16...earthing switch operating device, 17, 17'...first transmission shaft, 18...connection part, 19...movable contact of disconnector, 19'...movable contact of earthing switch, 20...fixed contact of disconnector, 20'...fixed contact of earthing switch, 21...first gear box, 22, 22'...first No. 2 transmission shaft, 23, 23'... second gearbox, 24... fourth additional branch busbar, 25... fifth additional branch busbar, 26... sixth additional branch busbar, 131... disconnector interlock mechanism, 131'... earthing switch interlock mechanism, 132, 133... Bowden pull cable or push cable, 1310, 1310'... air hole, 1311... disconnector interlock device, 1311'... earthing switch interlock device, 1312... disconnector interlock device cover, 1312'... earthing switch Cover for a disconnector interlock device, 1313...flange of an interlock mechanism for a disconnector, 1313'...flange of an interlock mechanism for a grounding switch, 1314, 1315...first pull lever, 1316, 1317'...second pull lever, 1317...block lever, 1317a...gap, 1318, 1318'...trapezoidal spindle, 1319, 1319'...trapezoidal nut, 1320...front bearing, 1321...first end bolt, 1321'...second end bolt, 1322...guide rod, 1323, 1323'...Pivot pin, 1324...Spiral spring, 1325...Protective seal ring, 1326...Roller, 1327...Rear bearing, 13111...Interlock device for disconnector, 13111'...Interlock device for earthing switch, 1312...Cover for interlock device for disconnector, 1312'...Interlock device for earthing switch, 13112'...Surface of interlock device for earthing switch, 13171'...Second pre-lever surface, 13191...U-shaped groove, 13211'...Trapezoidal nut surface.

Claims

1. A switchgear in which a disconnector and a grounding switch are electrically connected via a connection part, and the disconnector and the grounding switch are each provided with an interlock device that blocks switching operations, A switchgear, characterized in that the interlock device of the disconnector and the interlock device of the earthing switch are connected via a Bowden pull cable or a push cable.

2. The opening and closing device according to claim 1, The disconnector comprises a U-phase disconnector, a V-phase disconnector, and a W-phase disconnector, while the earthing switch comprises a U-phase earthing switch, a V-phase earthing switch, and a W-phase earthing switch, The three phases of the U-phase disconnector, the V-phase disconnector, and the W-phase disconnector all have the same configuration and are arranged in a row with each other, The switchgear is further characterized in that the three phases, i.e., the U-phase earthing switch, the V-phase earthing switch and the W-phase earthing switch, all have the same configuration and are arranged in a row with each other.

3. The opening and closing device according to claim 2, The disconnector includes a disconnector operating device, and the earthing switch includes a earthing switch operating device, and the disconnector and the earthing switch are operated to be opened and closed via the disconnector operating device and the earthing switch operating device, respectively; A switchgear comprising: a mechanical interlock mechanism provided between the disconnector and the earthing switch.

4. The opening and closing device according to claim 3, Each of the three phases (U phase, V phase, and W phase) of the disconnector and the earthing switch has a movable contact and a fixed contact, The circuit breaker has the movable contacts of each phase operated by the circuit breaker operating device to open and close the fixed contacts of each phase, and the earthing switch has the movable contacts of each phase operated by the earthing switch operating device to open and close the fixed contacts of each phase.

5. The opening and closing device according to claim 4, a disconnector operating device and an earthing switch operating device, each having at least one output shaft, and the disconnector operating device and the earthing switch operating device are attached to the disconnector of each phase and the earthing switch of each phase, respectively, via the output shaft.

6. The opening and closing device according to claim 5, one of the output shafts from the disconnector operator and the earthing switch operator is connected to one of the phases of the U-phase disconnector and the U-phase earthing switch, and a second output shaft from the disconnector operator and the earthing switch operator is connected to a first transmission shaft that transmits motion to the V-phase disconnector and the V-phase earthing switch via a first gear box attached to the V-phase disconnector and the V-phase earthing switch; The switchgear further comprises a second transmission shaft having a smaller motion than the first transmission shaft, and the motion is transmitted to the W-phase disconnector and the W-phase earthing switch via a disconnector interlock mechanism and an earthing switch interlock mechanism connected between the first gear box of the V-phase disconnector and the V-phase earthing switch and the second gear box of the W-phase disconnector and the W-phase earthing switch.

7. The opening and closing device according to claim 6, When the disconnector operating device performs a closing operation, the disconnector interlock mechanism operates, and the operation is transmitted to the earthing switch interlock mechanism via the Bowden pull cable or the push cable connecting the disconnector interlock mechanism and the earthing switch interlock mechanism.

8. The opening and closing device according to claim 7, a disconnector interlock mechanism and a grounding switch interlock mechanism having the same configuration, and the Bowden pull cable or the push cable also having the same configuration, and the Bowden pull cable or the push cable connects the disconnector interlock mechanism and the grounding switch interlock mechanism.

9. The opening and closing device according to claim 8, The disconnector interlock mechanism includes a disconnector interlock device, and the earthing switch interlock mechanism includes a grounding switch interlock device, and the disconnector interlock mechanism and the earthing switch interlock mechanism include covers for the disconnector interlock device and the earthing switch interlock device on both sides, and a disconnector interlock device cover and a grounding switch interlock device cover, the disconnector interlock mechanism and the grounding switch interlock mechanism being fixed to the disconnector interlock mechanism and the grounding switch interlock mechanism via screws.

10. The opening and closing device according to claim 9, The switchgear, characterized in that the disconnector interlock mechanism and the earthing switch interlock mechanism are provided with air holes for air circulation.

11. The opening and closing device according to claim 10, The disconnector interlock mechanism and the grounding switch interlock mechanism each have a first pull lever and a second pull lever disposed near the first pull lever; the disconnector interlock mechanism comprises a disconnector interlock mechanism having a trapezoidal spindle with a trapezoidal nut, the trapezoidal spindle being supported at both ends by a front bearing and a rear bearing, and the trapezoidal nut protrudes toward a first pull lever and has a cylindrical shape so as to accommodate a roller.

12. The opening and closing device according to claim 11, When the trapezoidal spindle rotates, the trapezoidal nut runs on the trapezoidal spindle, and a guide rod for restricting the rotational movement of the trapezoidal nut and moving it in a translational movement is provided on the axis of the trapezoidal spindle and inserted into a U-shaped groove formed in the trapezoidal nut; the guide rod is attached to the disconnector interlock mechanism via two screws provided at both ends, and pivot pins that hold the second pull lever and the block lever, respectively, are provided so as to be capable of rotational movement around their axes.

13. The opening and closing device according to claim 12, a first end bolt installed on the Bowden pull cable or push cable at one end for fixing the second pull lever of the disconnector interlock mechanism, and a second end bolt installed on the Bowden pull cable or push cable at the other end for fixing the second pull lever of the earthing switch interlock mechanism, wherein the first and second end bolts on both sides of the Bowden pull cable or push cable are fixed to the levers using hex nuts.

14. The opening and closing device according to claim 13, a helical spring is provided for constantly compressing the second pull lever toward the grounding switch interlock device in order to keep the second pull lever of the grounding switch interlock mechanism in an unblocked position.

15. The opening and closing device according to claim 14, A switchgear, comprising: a gap provided between the pivot pin and the second pull lever of the earthing switch interlock mechanism.

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