Switching unit and gas-insulated switchgear

Abstract

To provide a gas-insulated switchgear that can be configured compactly. [Solution] The switch of the switching unit has a cylindrical retaining electrode (D34) that supports a rod-shaped movable contact (D33), an insulating operating rod (D37) connected to the movable contact, and an insulating support member (D36) that fixes the retaining electrode. The insulating support member is provided with holes through which the movable contact and the insulating operating rod pass, and covers the retracted end of the retaining electrode.

Description

Technical Field

[0001] The present invention relates to an opening / closing unit and a gas-insulated switchgear using the same.

Background Art

[0002] Power receiving equipment is provided in facilities, buildings, etc. A gas-insulated switchgear (GIS) is applied to such power receiving equipment.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Such power receiving equipment is required to reduce the installation area or the installation capacity (volume). Therefore, downsizing of each unit constituting the gas-insulated switchgear is expected. The present disclosure has been made in view of such problems, and an object thereof is to provide an opening / closing unit or a gas-insulated switchgear that can be configured compactly.

Means for Solving the Problems

[0005] To solve the above problems, an opening / closing unit according to one aspect of the present disclosure comprises a sealed container and a switch disposed within the sealed container, wherein the switch comprises a fixed contact, a rod-shaped movable contact that is movable in the axial direction and moves toward and toward the fixed contact, a cylindrical holding electrode that slides with the movable contact passing through it and supports the movable contact, an insulating operating rod that transmits a driving force to move the movable contact forward and backward to the movable contact and is connected to the retracted end of the movable contact, and an insulating support member that fixes the holding electrode to the sealed container, wherein the insulating support member is provided with a hole through which the movable contact and the insulating operating rod pass, and the insulating support member is configured to cover the retracted end of the holding electrode. [Effects of the Invention]

[0006] According to one aspect of this disclosure, a compact switchgear unit or gas-insulated switchgear can be provided. [Brief explanation of the drawing]

[0007] [Figure 1] This figure shows the external appearance of a gas-insulated switchgear to which a switchgear unit according to one embodiment of the present disclosure is applied. [Figure 2] This is a single-line diagram showing an example of the circuit configuration of the gas-insulated switchgear described above. [Figure 3] This is a schematic cross-sectional view showing the configuration of the main part of the opening and closing unit described above. [Figure 4] This is a perspective view showing the connection status from each switch in the above switching unit to the return track (busbar). [Figure 5] This is a cross-sectional view showing the structure of the return track (busbar) in the above-mentioned switching unit. [Figure 6] This is a cross-sectional view showing the structure of the return track (busbar) in the above-mentioned switching unit. [Figure 7] This is a cross-sectional view showing the structure of the switch provided in the above switching unit, representing the disconnected state. [Figure 8] This is a cross-sectional view showing the structure of the switch provided in the above switching unit, representing the closed state. [Modes for carrying out the invention]

[0008] [Embodiment] Hereinafter, one embodiment of the present disclosure will be described in detail. Figure 1 is a diagram showing the external appearance of a gas-insulated switchgear 101 to which the switching unit 2 according to the present disclosure is applied. Figure 2 is a single-line diagram showing an example of the circuit configuration of the gas-insulated switchgear 101.

[0009] With respect to the gas-insulated switchgear 101, the X, Y, and Z directions are defined by the double-headed arrows in each figure and are used in the following description. The X, Y, and Z directions are mutually orthogonal. In this embodiment, the Z direction is the vertical direction, and the case where the +Z side is upward and the -Z side is downward is described as an example.

[0010] Therefore, the X and Y directions are parallel to the horizontal plane. In this embodiment, the direction of movement of the movable contact of the power receiving side switch DS2 of the switching unit 2 (described later), and the direction of movement of the movable contact D33 of the transformer side switch DS3 are both in the X direction, and each switch is arranged such that the +X side is the forward side and the -X side is the backward side.

[0011] <Overview of Gas-Insulated Switchgear 101> As shown in Figure 1 or Figure 2, the gas-insulated switchgear 101 comprises a power receiving unit 1, a switching unit 2, a transformer unit 3, a connection unit 4, and a measurement unit 5. The power receiving unit 1 consists of a first unit 11 and a second unit 12. The first unit 11 is located on the +X side of the second unit 12 and is connected to the second unit 12.

[0012] A line L is connected to an inlet pipe 20c provided on the side surface of the first unit 11 via a cable head CHD. The line L is composed of a power cable. A current transformer CT for measuring current may be mounted on the line L. Note that, instead of the cable head CHD, it may be configured to be connected to an inlet pipe where a power receiving bushing is appropriately provided.

[0013] The transformer unit 3, the switching unit 2, and the second unit 12 are arranged so as to be stacked vertically in this order. Specifically, the transformer unit 3 is arranged below (-Z side) the switching unit 2 and connected to each other, and the second unit 12 is arranged above (+Z side) the switching unit 2 and connected to each other.

[0014] The measurement unit 5 is located on the +Y side of the switching unit 2 and connected to the switching unit 2. The measurement unit 5 has a measurement unit container 55 and houses a voltage transformer 400 (VCT) for power supply and demand meters inside. Since FIG. 1 is a view of the gas-insulated switchgear 101 seen in the +Y direction, the measurement unit 5 is hidden and not visible.

[0015] The connection unit 4 is located on the +X side of the transformer unit 3 and connected to the transformer unit 3. The connection unit 4 is a unit for connecting the transformer 200. The transformer 200 is installed, for example, so as to be linearly aligned with the transformer unit 3 and the connection unit 4.

[0016] The gas-insulated switchgear 101 further includes an operation box 70, a cover 80, a support frame 90, and a base 100. In FIG. 1, the position where the cover 80 is mounted is represented by a two-dot chain line. The cover 80 covers the current transformer CT and the cable head CHD together with the line L. The cover 80 may have a structure that can be opened and closed.

[0017] The operation box 70 houses operators for operating each switch, which are arranged inside the first unit 11, the second unit 12, the opening / closing unit 2, and the transformer unit 3 respectively. A door that can be opened and closed is provided on the -X side surface of the housing of the operation box 70. This side surface corresponds to the front of the gas-insulated switchgear 101, and by opening the door, an operator can access the interface for controlling the operator.

[0018] The support frame 90 is a frame that supports the power reception unit 1, the opening / closing unit 2, the transformer unit 3, the connection unit 4, and the operation box 70. The base 100 is a base for adjusting the height of the gas-insulated switchgear 101 connected to the transformer 200.

[0019] The gas-insulated switchgear 101 shown in FIG. 1 or FIG. 2 is power reception equipment corresponding to one line. However, for example, in the case of power reception equipment for two lines such as a normal line and a standby line, the configuration of the power reception equipment may be such that two gas-insulated switchgears 101 shown in FIG. 1 are arranged side by side in the Y direction. In the case of such two-line power reception equipment, the measurement unit 5 may be common to the two lines.

[0020] <Power reception unit 1> The power reception unit 1 is a unit having a switching function between the power reception side bus BUS1 and the line L. The first unit 11 has a first unit container 20 that constitutes the outer shell. Inside the first unit container 20, a lightning arrester LA, a voltage detection device VD, a line side earthing switch ES1, and a line side switch DS1 are housed. The first unit container 20 is a sealed container, and an insulating gas is enclosed inside.

[0021] The voltage detection device VD detects the voltage applied to the internal conductor of the first unit 11, which is connected to the cable head CHD. The surge arrester LA is installed between the internal conductor and the ground. The line-side grounding switch ES1 is installed to ground the internal conductor when closed. The line-side switch DS1 is a switch that can open and close the internal conductor of the first unit 11. That is, the line-side switch DS1 is connected to the cable head CHD in the circuit.

[0022] The first unit container 20 has a main body 20a, a connecting pipe 20b, and a draw-in pipe 20c. The main body 20a is cylindrical in shape and is positioned so that its central axis is parallel to the Z direction. The connecting pipe 20b is the part for connecting to the second unit container 30, which will be described later. The connecting pipe 20b is formed on the outer circumferential surface of the main body 20a so as to extend a short distance in a direction perpendicular to the central axis of the main body 20a (radial direction).

[0023] The service drop pipe 20c is provided to draw the track L into the first unit container 20 of the first unit 11. A cable head CHD is attached to the service drop pipe 20c. As shown in Figure 1, the service drop pipe 20c is provided on the side of the first unit 11, that is, on the outer circumferential surface of the main body 20a.

[0024] The second unit 12 has a second unit container 30 that forms the outer casing. Inside the second unit container 30 are a circuit breaker CB1 and grounding switches ESO1 and ESO2 for circuit breaker inspection. The second unit container 30 is a sealed container and is filled with insulating gas.

[0025] Circuit breaker CB1 is a circuit breaker that disconnects the power receiving busbar BUS1 from line L. Therefore, circuit breaker CB1 is connected to line-side switch DS1 in the circuit. Circuit breaker inspection grounding switches ESO2 and ESO3 are switches that are closed when circuit breaker CB1 is inspected to ground the terminals on both sides of circuit breaker CB1, respectively. Circuit breaker CB1 and circuit breaker inspection grounding switches ESO1 and ESO2 are each operated by the above-mentioned controls housed in the control box 70.

[0026] The second unit container 30 has a main body 30a, a connecting pipe 30b, and a connecting pipe 30c. The main body 30a is cylindrical in shape and is positioned so that its central axis is parallel to the Z direction. Therefore, the main body 30a of the first unit container 20 and the main body 20a of the second unit container 30 are positioned close together so that their axial directions are aligned in the same direction.

[0027] The connecting pipe 30b is provided for connection to the first unit container 20. The connecting pipe 30b is formed on the outer circumferential surface of the main body 30a so as to extend a short distance in a direction perpendicular to the central axis of the main body 30a (radial direction). The connecting pipes 20b and 30b are flange-connected to each other, thereby enabling communication of circuits, etc., between the first unit container 20 and the second unit container 30. The connecting pipe 30c is a conduit for connecting the main body 30a and the control box 70.

[0028] <Transformer unit 3, connection unit 4> While the second unit 12 was a unit equipped with a circuit breaker CB1 that interrupts the connection between the receiving bus BUS1 and the line L, the transformer unit 3 is a unit equipped with a circuit breaker CB2 that interrupts the connection between the transformer bus BUS2 and the transformer 200. The transformer unit 3 has a transformer unit container 50 that forms its outer casing. The transformer unit container 50 is a sealed container and is filled with insulating gas.

[0029] The transformer unit container 50 houses a circuit breaker CB2 and two grounding switches ESO3 and ESO4 for circuit breaker inspection. The grounding switches ESO3 and ESO4 are switches that are closed during inspection of the circuit breaker CB2 to ground the terminals on both sides of the circuit breaker CB2. Each of the circuit breaker CB2 and the grounding switches ESO3 and ESO4 for circuit breaker inspection is operated by the aforementioned controls housed in the control box 70.

[0030] The transformer unit container 50 has a main body 50a, a connecting pipe 50b, and a connecting pipe 50c. The main body 50a is cylindrical in shape and is positioned so that its central axis is parallel to the Z direction. The connecting pipe 50b is a conduit provided for connecting to the connection unit 4. The connecting pipe 50c is a conduit for connecting the main body 50a to the control box 70.

[0031] The connection unit 4 is an interposed unit used to connect the transformer unit 3, which houses the circuit breaker CB2, to the transformer 200. The connection unit 4 has a connection unit container 60 that forms its outer casing. Inside the connection unit container 60 is a bushing BS for connecting the transformer 200. On the circuit, the circuit breaker CB2 of the transformer unit 3 is connected to the bushing BS.

[0032] The connection unit container 60 is cylindrical in shape, and its central axis is positioned parallel to the X-axis. One end of the connection unit container 60 is flange-connected to the connecting pipe 50b of the transformer unit container 50, thereby enabling communication of circuits, etc., between the connection unit container 60 and the transformer unit container 50. The other end of the connection unit container 60 is flange-connected to the connection portion of the transformer 200, thereby enabling communication of circuits, etc., between the connection unit container 60 and the transformer 200.

[0033] <Opening / Closing Unit 2> Switching unit 2 houses the receiving bus BUS1, the transformer bus BUS2, the receiving switch DS2, and the transformer switch DS3. The receiving switch DS2 and the transformer switch DS3 are sometimes referred to as disconnectors.

[0034] The receiving busbar BUS1 is a busbar common to all lines when the receiving equipment receives power from multiple lines. The transformer busbar BUS2 is a busbar common to all transformers 200 when the power receiving and transforming equipment is configured with multiple transformers 200. Since the switching unit 2 houses the busbars in this way, it may also be called a busbar room.

[0035] On the circuit, the receiving-side switch DS2 is located between the receiving-side bus BUS1 and the circuit breaker CB1. On the circuit, the transformer-side switch DS3 is located between the transformer-side bus BUS2 and the circuit breaker CB2. The receiving-side switch DS2 and the transformer-side switch DS3 are operated by the controls housed in the control box 70.

[0036] The switching unit 2 is a sealed container and has a busbar container 40 that forms its outer casing. The busbar container 40 has a main body 40a, a connecting pipe 40b, and a connecting pipe 40c. The main body 40a is cylindrical in shape, its central axis is oriented in the Z direction, and is positioned to coincide with the central axis of the main body 30a of the second unit container 30 and the central axis of the main body 50a of the transformer unit 3.

[0037] The upper end (+Z side end) of the main body 40a is flange-jointed with the lower end of the main body 30a of the second unit container 30, thereby enabling communication of circuits, etc., between the main body 40a and the main body 30a. The lower end (-Z side end) of the main body 40a is flange-jointed with the upper end of the main body 50a of the transformer unit 3, thereby enabling communication of circuits, etc., between the main body 40a and the main body 50a.

[0038] The connecting pipe 40b is a conduit provided for connecting to the measurement unit 5. By flange-connecting the connecting pipe 40b to the measurement unit container 55 of the measurement unit 5, circuits and the like can be communicated between the main body 40a and the measurement unit container 55. The connecting pipe 40c is a conduit for connecting the main body 40a and the control box 70. The structure of the opening / closing unit 2 will be described in more detail later.

[0039] <Measurement Unit 5> The measurement unit 5 houses the power receiving busbar BUS1, the transformer busbar BUS2, and the power supply and demand metering transformer 400. The power supply and demand metering transformer 400 is a measuring instrument also known as a VCT. The measurement unit 5 has a measurement unit container 55 that forms its outer casing.

[0040] Inside the measurement unit container 55, the receiving busbar BUS1 is connected to the input terminal of the power supply and demand metering transformer 400, and the transformer-side busbar BUS2 is connected to the output terminal of the power supply and demand metering transformer 400. Therefore, the receiving busbar BUS1 and the transformer-side busbar BUS2 are connected inside the measurement unit.

[0041] <Note> As described above, insulating gas is sealed inside the first unit container 20, the second unit container 30, the busbar container 40, the transformer unit container 50, the connection unit container 60, and the measurement unit container 55.

[0042] These containers are isolated from each other to prevent the flow of insulating gas. Preferably, an insulating gas is used that has a low environmental impact but lower insulating performance compared to SF6. Specifically, dry air, G-cube, nitrogen gas, etc., are used as insulating gases.

[0043] In this embodiment, the container forming the outer casing of the power receiving unit 1 is divided into two (or more) parts: a first unit container 20 and a second unit container 30. This allows the equipment constituting the power receiving unit 1 to be individually arranged in the divided first unit container 20 and second unit container 30 according to their function, and sufficient insulation distance can be ensured between the equipment. Therefore, the gas-insulated switchgear 101 of this embodiment can use an insulating gas with a low environmental impact.

[0044] Specifically, the power receiving unit needs to be equipped with numerous devices such as surge arresters LA, voltage detectors VD, line-side grounding switches ES1, line-side switches DS1, circuit breakers CB1, and circuit breaker inspection grounding switches ESO1 and ESO2. Therefore, in order to ensure insulation between each device, conventional gas-insulated switchgear used insulating gases such as SF6 gas, which have high insulating performance.

[0045] However, such insulating gases generally have a high greenhouse effect and a high environmental burden. In conventional gas-insulated switchgear configurations, if insulating gases with low environmental impact are used, the insulation performance is inferior, making it difficult to place the aforementioned components in close proximity, and thus the structure of the gas-insulated switchgear has to be made larger.

[0046] In the gas-insulated switchgear 101, the service entrance pipe 20c is positioned on the side of the first unit container 20, that is, on the outer circumferential surface of the main body 20a, and the space above the connection unit 4 can be used for bringing in the line L via the service entrance pipe 20c. As a result, in this embodiment, the limited space in which the gas-insulated switchgear 101 is installed can be effectively utilized.

[0047] Furthermore, in the gas-insulated switchgear 101, the second unit 12 equipped with the receiving-side circuit breaker CB1 and the transformer unit 3 equipped with the transformer-side circuit breaker CB2 are stacked vertically. Therefore, the footprint of the gas-insulated switchgear 101 can be made compact, and in a power receiving and transforming facility to which the gas-insulated switchgear 101 is applied, the transformer 200 can be placed in close proximity to the gas-insulated switchgear 101. Therefore, the overall footprint of the power receiving and transforming facility to which the gas-insulated switchgear 101 is applied can also be reduced.

[0048] <Details of the internal structure of switching unit 2: Connection between the busbar and the switch> As described above, in the gas-insulated switchgear 101, the transformer unit 3, the switchgear unit 2, and the second unit 12 are arranged to be stacked vertically in this order, which reduces the installation area of ​​the gas-insulated switchgear 101. On the other hand, in order to reduce the height of the gas-insulated switchgear 101, it is necessary to reduce the size of the busbar chamber, which is the switchgear unit 2, in the height direction (Z direction).

[0049] The configuration of the switching unit 2 in the gas-insulated switchgear 101 of this disclosure will be described in more detail below. Figure 3 is a schematic cross-sectional view taken in the +Y direction to show the internal configuration of the switching unit 2. Three receiving-side switches DS2 are arranged in the Y direction for three phases inside the upper wall surface (+Z side wall) of the busbar container 40, and in Figure 3, only the receiving-side switch DS2W of the W phase, which is located closest to the -Y side, is shown in cross-section.

[0050] Similarly, three transformer-side switches DS3 are arranged in the Y direction inside the lower wall surface (-Z side wall surface) of the busbar container 40, and in Figure 3, only the W-phase transformer-side switch DS3W, which is located closest to the -Y side, is shown in cross-section. The upper and lower walls of the busbar container 40 are examples of the first and second walls of a sealed container, respectively.

[0051] In this specific example of the embodiment, the switching unit 2 is a three-phase integrated switching unit. Furthermore, in this specific example of the embodiment, the switching unit 2 is equipped with two sets of three-phase switches. However, the present invention is not limited to such examples; for example, a switching unit equipped with a single set of three-phase integrated switching units is also within the scope of application of the present invention.

[0052] Here, the receiving-side switches for the W phase, V phase, and U phase are denoted as receiving-side switch DS2W, receiving-side switch DS2V, and receiving-side switch DS2U, respectively. Receiving-side switch DS2 is a general term for these. Also, the transformer-side switches for the W phase, V phase, and U phase are denoted as transformer-side switch DS3W, transformer-side switch DS3V, and transformer-side switch DS3U, respectively. Transformer-side switch DS3 is a general term for these.

[0053] In the switching unit 2, as shown in Figure 3, the W-phase receiving-side switch DS2W and the W-phase transformer-side switch DS3W face each other in the Z direction. Although not shown, similarly in the switching unit 2, the V-phase receiving-side switch DS2V and the V-phase transformer-side switch DS3V face each other in the Z direction, and the U-phase receiving-side switch DS2U and the U-phase transformer-side switch DS3U face each other in the Z direction.

[0054] As will be explained in detail later, for the W, V, and U phases, the receiving busbar BUS1 and the transformer busbar BUS2 are configured as concentric return lines BDW, BDV, and BDU, respectively. The return lines BDW, BDV, and BDU are each located near the center of the busbar container 40 in the Z direction (height direction), extend in the Y direction, and are arranged side by side in the X direction.

[0055] In other words, the direction in which the return lines BDW, BDV, and BDU (each busbar) are aligned is 90° different from the direction in which the receiving-side switches DS2 are aligned, and also 90° different from the direction in which the transformer-side switches DS3 are aligned. Figure 4 is a perspective view showing the connection relationship between the return lines BDW, BDV, and BDU and the receiving-side switches DS2 and transformer-side switches DS3 for each phase.

[0056] To avoid complexity in the diagrams, Figure 4 only shows the busbar-side connection terminals D25W, D25V, and D25U of the receiving-side switch DS2 for the W, V, and U phases, respectively. Similarly, Figure 4 only shows the busbar-side connection terminals D35W, D35V, and D35U of the receiving-side switch DS2 for the W, V, and U phases, respectively, of the transformer-side switch DS3. The busbar-side connection terminals D25W, D25V, and D25U are collectively referred to as busbar-side connection terminal D25. Furthermore, the busbar-side connection terminals D35W, D35V, and D35U are collectively referred to as busbar-side connection terminal D35.

[0057] Figures 5 and 6 illustrate the connection points to the disconnectors of the return lines, using the W phase as an example, but the same applies to the other phases. Figure 5 is a cross-sectional view of the connection point of the W phase return line BDW, viewed in the +Y direction. Figure 6 is a cross-sectional view of the connection point of the W phase return line BDW, viewed in the +X direction. In Figures 5 and 6, hatching is applied only to the W phase receiving busbar BUS1W and transformer busbar BUS2W to make the configuration easier to understand.

[0058] As shown in Figures 4 to 6, the busbar-side connection terminal D35W of the W-phase transformer-side switch DS3W and the W-phase transformer-side bus BUS2W are electrically connected by a linear second connecting conductor C3W. In addition, the busbar-side connection terminal D25W of the W-phase receiving-side switch DS2W and the W-phase receiving-side bus BUS1W are electrically connected by a linear first connecting conductor C2W.

[0059] Similarly, the busbar-side connection terminal D35V of the V-phase transformer-side switch DS3V and the V-phase transformer-side busbar BUS2V are electrically connected by a linear second connecting conductor C3V. In addition, the busbar-side connection terminal D25V of the V-phase receiving-side switch DS2V and the V-phase receiving-side busbar BUS1V are electrically connected by a linear first connecting conductor C2V.

[0060] The busbar-side connection terminal D35U of the U-phase transformer-side switch DS3U and the U-phase transformer-side busbar BUS2U are electrically connected by a linear second connecting conductor C3U. Furthermore, the busbar-side connection terminal D25U of the U-phase receiving-side switch DS2U and the U-phase receiving-side busbar BUS1U are electrically connected by a linear first connecting conductor C2U.

[0061] As shown in Figures 5 and 6, in detail, in the round-trip line BD of each phase, the receiving busbar BUS1 is composed of a rod-shaped conductor including a central axis, and the transformer-side busbar BUS2 is composed of a hollow cylindrical conductor that covers the receiving busbar BUS1 and is spaced apart from it. Also as shown in the figures, connecting fittings are appropriately provided at the connection portion of the round-trip line BD for connecting the receiving busbar BUS1 or the transformer-side busbar BUS2 to each connecting conductor.

[0062] <Details of the internal structure of the switching unit 2: Structure of the switch> Next, the structures of the power receiving side switch DS2 and the transformer side switch DS3 of the switching unit 2 in the gas-insulated switchgear 101 of this disclosure will be described. The transformer side switch DS3 will be described below with reference to the drawings, but the power receiving side switch DS2 has a similar structure except that the Z direction is reversed.

[0063] As shown in Figure 3, the first insulating spacer 40d and the second insulating spacer 40e fix the receiving-side switch DS2W and the transformer-side switch DS3W, respectively. The first insulating spacer 40d and the second insulating spacer 40e constitute a part of the upper and lower wall surfaces of the busbar container 40, respectively. The first insulating spacer 40d and the second insulating spacer 40e may be provided separately for each phase of the receiving-side switch DS2W and the transformer-side switch DS3W, respectively, or they may be provided as a single unit for all three phases.

[0064] Figures 7 and 8 are cross-sectional views of the transformer-side switch DS3 in the +Y direction. Figure 7 shows the transformer-side switch DS3 in the open state, and Figure 8 shows it in the closed state. In Figures 7 and 8, hatching indicates that the covered component is insulating.

[0065] The transformer-side switch DS3 includes an external connection terminal D31, a fixed contact D32, a movable contact D33, a holding electrode D34, a busbar-side connection terminal D35, an insulating support member D36, an insulating operating rod D37, a second insulating member D38, and a first insulating member D39.

[0066] The external connection terminal D31 penetrates the second insulating spacer 40e and provides electrical conductivity to the outside of the busbar container 40. The external connection terminal D31 is also connected to the fixed contact D32, which fixes the fixed contact D32 of the transformer-side switch DS3, etc., to the lower wall surface of the busbar container 40.

[0067] The movable contact D33 consists of a rod-shaped conductor extending in the X direction and is capable of moving forward and backward in the axial direction, i.e., in the X direction. The fixed contact D32 is a conductor that moves in and out of contact with the movable contact D33 as the movable contact D33 moves forward and backward. When the movable contact D33 moves in the +X direction, i.e., forward, the movable contact D33 comes into contact with the fixed contact D32 and conducts electricity between them. When the movable contact D33 moves in the -X direction, i.e., backward, the movable contact D33 separates from the fixed contact D32 and conduction is interrupted.

[0068] The retracted (-X) end of the fixed contact D32 has a cylindrical shape into which the movable contact D33 is inserted, and a member is appropriately arranged inside it to generate contact pressure against the side surface of the movable contact D33 when the movable contact D33 is inserted.

[0069] The retaining electrode D34 consists of a cylindrical conductor that supports the movable contact D33. The movable contact D33 moves forward and backward by sliding against the retaining electrode D34. A member is appropriately placed on the inner surface of the retaining electrode D34 to generate contact pressure against the side surface of the movable contact D33.

[0070] A dome-shaped shield D34a is provided at the forward-facing (+X side) end of the retaining electrode D34, with a hole in the center through which the movable contact D33 passes. The shield D34a is configured such that, in the steady-state position where the movable contact D33 is retracted and the transformer-side switch DS3 is open, the tip of the forward-facing (+X side) end of the movable contact D33 is housed within the dome. The shield D34a is provided to mitigate the electric field near the forward-facing end of the retaining electrode D34 and near the tip of the forward-facing (+X side) end of the movable contact D33 in the steady-state position.

[0071] The busbar-side connection terminal D35 mentioned above is connected and fixed to the upper side (+Z side) of the retaining electrode D34. The insulating support member D36 fixes the retaining electrode D34 of the transformer-side switch DS3 to the lower wall surface of the busbar container 40. The insulating support member D36 is provided with a hole through which the movable contact D33 and the insulating operating rod D37 pass. The retracted end of the retaining electrode D34 is inserted into this hole. Therefore, the retracted end (-X side) of the retaining electrode D34 is covered by the insulating support member D36, and the outer surface of the retracted end of the retaining electrode D34 is not exposed.

[0072] The insulating operating rod D37 is a rod-shaped member extending in the X direction that transmits the driving force to move the movable contact D33 forward and backward to the movable contact D33. The movable contact D33 and the insulating operating rod D37 are connected such that the backward end of the insulating support member D36 is embedded in the forward end (+X side) of the insulating operating rod D37. Therefore, the insulating operating rod D37 moves forward and backward together with the movable contact D33. The insulating operating rod D37 is operated by the aforementioned operating device via an appropriate link mechanism.

[0073] When the transformer-side switch DS3 is opened, the components are arranged such that at the moment the movable contact D33 retracts and separates from the fixed contact D32, a portion of the insulating operating rod D37 is located inside the hole in the insulating support member D36. In other words, at this point, the rearmost end of the area of ​​the movable contact D33 that is not embedded in the insulating operating rod D37 and is exposed is located inside the hole in the insulating support member D36.

[0074] As mentioned above, the retracted end of the retaining electrode D34 is covered by the insulating support member D36. Therefore, the transformer-side switch DS3 is configured to make it difficult for discharge to occur from the movable contact D33 and the retaining electrode D34 at the rear end. Such discharge may occur in other phases, such as the transformer-side switch DS3, the receiving bus BUS1 or its connecting conductors, and the transformer-side bus BUS2 or its connecting conductors.

[0075] The rearmost (rearmost) end region of the cylindrical portion of the fixed contact D32 is covered with a second insulating member D38, which has a torus-like appearance. The second insulating member D38 is mounted on the fixed contact D32 such that its central axis coincides with that of the cylindrical portion of the fixed contact D32. The second insulating member D38 has a substantially rotationally symmetric shape.

[0076] The outer diameter of the second insulating member D38 is larger than the outer diameter of the cylindrical portion of the fixed contact D32, and the diameter of the hole in the second insulating member D38 is smaller. The diameter of the hole in the second insulating member D38 is larger than the diameter of the movable contact D33, so the movable contact D33 passes through the second insulating member D38 without contacting it. The forward-facing (+X side) tip position (foremost end) of the second insulating member D38 is on the forward-facing (+X side) and the backward-facing (-X side) tip position (rearmost end) is on the backward-facing (-X side) compared to the rear end (rearmost end) of the cylindrical portion of the fixed contact D32.

[0077] The dome-shaped shield D34a of the retaining electrode D34 is covered by a first insulating member D39 which has a torus-like appearance. The first insulating member D39 is mounted so as to overlap the outer wall of the shield D34a so that its central axis coincides with that of the shield D34a. The first insulating member D39 has a substantially rotationally symmetric shape.

[0078] The outer diameter of the first insulating member D39 is larger than the outermost diameter of the dome-shaped shield D34a, and the diameter of the hole in the first insulating member D39 is smaller. The diameter of the hole in the first insulating member D39 is larger than the diameter of the movable contact D33, so the movable contact D33 passes through the first insulating member D39 without contacting it. The forward-facing tip (foremost end) of the first insulating member D39 is on the forward side (+X side), and the backward-facing tip (rearmost end) is on the backward side (-X side), compared to the forward-facing tip (foremost end) of the holding electrode D34.

[0079] The second insulating member D38 and the first insulating member D39 mitigate the electric field between the fixed contact D32 and the holding electrode D34. Therefore, the second insulating member D38 and the first insulating member D39 have the effect of suppressing the occurrence of discharge between the fixed contact D32 and the holding electrode D34.

[0080] Furthermore, since the second insulating member D38 and the first insulating member D39 are torus-shaped and substantially rotationally symmetric, the electric field in all radial directions is also mitigated near the retracted end of the fixed contact D32 and near the advancing end of the holding electrode D34.

[0081] Therefore, the transformer-side switch DS3 is configured such that discharge from the movable contact D33 and the retaining electrode D34 is less likely to occur near the retracted end of the fixed contact D32 and near the forward end of the retaining electrode D34. However, such discharge may occur in other phases, specifically in the transformer-side switch DS3, the receiving bus BUS1 or its connecting conductors, and the transformer-side bus BUS2 or its connecting conductors.

[0082] <Effect, etc.> As described above, the switching unit 2 houses all three phases of the busbars necessary for the power receiving equipment, including two busbars (receiving busbar BUS1 and transformer busbar BUS2), and switches (receiving switch DS2 and transformer switch DS3: disconnectors) installed between each of these busbars and each of the circuit breakers (circuit breakers CB1 and CB2), inside the busbar container 40.

[0083] Moreover, by arranging and connecting these parts as described above, the height of the busbar container 40 can be kept low. Furthermore, by arranging the receiving-side switch DS2 and the transformer-side switch DS3 with the insulating members described above, the possibility of discharge can be suppressed even if these parts are densely arranged. Therefore, according to this embodiment, a compact switching unit 2 can be realized, and a compact gas-insulated switchgear 101 and a compact power receiving and transforming equipment equipped with such a switching unit 2 can be realized.

[0084] In particular, the height of the opening / closing unit 2 allows for a reduction in the overall height of the gas-insulated switchgear 101, enabling it to be transported to the installation site without disassembling the gas-insulated switchgear 101 into its individual units. In this case, the installation of the gas-insulated switchgear 101 can be simplified by eliminating the need for disassembly, on-site assembly, on-site gas treatment, and on-site inspection, resulting in significant advantages in terms of transportation, construction time, and quality.

[0085] 〔summary〕 Aspect 1 of the present disclosure is an opening / closing unit comprising a sealed container and a switch disposed within the sealed container, wherein the switch comprises a fixed contact, a rod-shaped movable contact that is movable axially and moves back and forth with respect to the fixed contact, a cylindrical holding electrode that slides with the movable contact passing through it and supports the movable contact, an insulating operating rod that transmits a driving force to move the movable contact back and forth to the movable contact and is connected to the retracted end of the movable contact, and an insulating support member that fixes the holding electrode to the sealed container, wherein the insulating support member is provided with a hole through which the movable contact and the insulating operating rod pass, and the insulating support member covers the retracted end of the holding electrode.

[0086] Aspect 2 of the present disclosure is an opening / closing unit of aspect 1, wherein the holding electrode is provided with a dome-shaped shield having a hole in the center through which the movable contact passes, and which constitutes the end opposite to the retracted side, and a first insulating member is attached to the holding electrode so as to cover the outer wall of the dome-shaped shield, and the first insulating member has a torus-like appearance when attached to the shield.

[0087] Aspect 3 of the present disclosure is a configuration in which, in the opening / closing unit of aspect 1 or 2, a torus-shaped second insulating member facing the first insulating member is attached to the retracted end of the fixed contact.

[0088] Aspect 4 of the present disclosure is a three-phase integrated switching unit in which, in any of the switching units of aspects 1 to 3 described above, the three phase switches are arranged in a row on the first wall surface of the sealed container.

[0089] Aspect 5 of the present disclosure is a configuration in which, in the switching unit of aspect 4, the three phase switches are also arranged in a row on the second wall facing the first wall.

[0090] Aspect 6 of the present disclosure is a gas-insulated switchgear comprising the switching unit of Aspect 5 above and a measuring unit connected to the switching unit, wherein the measuring unit incorporates an instrument transformer positioned on the circuit between the three phase switches arranged on the first wall and the three phase switches arranged on the second wall.

[0091] This disclosure is not limited to the embodiments described above, and various modifications are possible within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in the embodiments are also included in the technical scope of this disclosure. [Explanation of Symbols]

[0092] 101 Gas-insulated switchgear 1 Power receiving unit 11 Unit 1 12 Unit 2 3 Transformer Unit 4 Connection Units 5. Measurement Unit 400 Power supply and demand instrumentation transformers (instrumentation transformers) 2 Opening / Closing Unit 40 Bus bar container (closed container) 40d First insulating spacer 40e Second Insulating Spacer BDW, BDV, BDU round-trip tracks BUS1 (BUS1W) Power receiving busbar BUS2 (BUS2W) Transformer-side busbar DS2 (DS2W) Power-receiving side switch (switch) D25 (D25W, D25V, D25U) Busbar side connection terminal DS3 (DS3W) Transformer-side switch (switch) D31 External connection terminal D32 Fixed Contact D33 Movable Contact D34 holding electrode D34a Shield D35 (D35W, D35V, D35U) Busbar side connection terminal D36 Insulating support member D37 Insulated Operating Rod D38 Second insulating member D39 First insulating member

Claims

1. A sealed container, The sealed container comprises a switch located inside the sealed container, The aforementioned switch is Fixed contact lenses and A rod-shaped movable contact that can move back and forth in the axial direction and move toward and away from the fixed contact, A holding electrode through which the movable contact slides, comprising a cylindrical holding electrode that supports the movable contact, An insulating operating rod that transmits a driving force to move the movable contact forward and backward to the movable contact, the insulating operating rod being connected to the retracted end of the movable contact, The holding electrode has an insulating support member that fixes it to the sealed container, An opening / closing unit comprising an insulating support member provided with a hole through which the movable contact and the insulating operating rod pass, and the insulating support member covering the retracted end of the retaining electrode.

2. The retaining electrode is provided with a dome-shaped shield having a hole in the center through which the movable contact passes, which forms the end opposite to the retracted side. A first insulating member is attached to the holding electrode so as to cover the outer wall of the dome-shaped shield. The opening / closing unit according to claim 1, wherein the first insulating member has a torus-like appearance when attached to the shield.

3. The opening / closing unit according to claim 2, wherein a torus-shaped second insulating member facing the first insulating member is attached to the retracted end of the fixed contact.

4. The aforementioned switching unit is a three-phase integrated switching unit, The switching unit according to any one of claims 1 to 3, wherein the three phase switches are arranged in a row on the first wall surface of the sealed container.

5. The switching unit according to claim 4, wherein the three-phase switches are also arranged in a row on the second wall facing the first wall.

6. The opening and closing unit according to claim 5, The unit comprises a measuring unit connected to the opening / closing unit, The aforementioned measurement unit is A gas-insulated switchgear incorporating an instrument transformer, positioned on the circuit between the three-phase switches arranged on the first wall and the three-phase switches arranged on the second wall.

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