JP5899028B2 - Switchgear - Google Patents

Description

  The present invention relates to a switchgear, and more particularly to a switchgear that is slidably energized.

  The switch gear is a device that is arranged in the power transmission / distribution system and that opens and closes the current flowing through the switch gear. An example of a conventional switchgear is disclosed in Patent Document 1, for example. Patent Document 1 describes the contents of a vacuum valve having a closing / cut-off performance and a ground disconnection part that can be switched between energization, disconnection, and grounding, and these are integrally molded with a solid insulator.

  Moreover, there exists what was described, for example in patent document 2 as an example of the circuit breaker regarding sliding electricity supply. In Patent Document 2, in order to reduce the breaking current that is borne in the vacuum valve, a resistor provided on the current-limiting rod is passed at the time of opening, and the resistor is opened so that the resistor enters the energization path only at the time of opening. The current limiting rod is configured to operate in conjunction with the pole operation (from one same operating device). The current limiting rod and the vacuum valve are electrically connected by a conductor sliding with the current limiting rod.

JP 2011-41407 A Japanese Patent Laid-Open No. 4-92329

  In Patent Document 1, it is described that the ground disconnection part and the vacuum valve are electrically connected mainly using a flexible conductor. The flexible conductor needs to have a length longer than the distance necessary for electrical connection so that it can follow the movement of the movable part, and the current loss increases accordingly. Moreover, in order to give flexibility, it has a shape in which thin plate-like conductors are laminated, and the energization loss increases because the energization area is reduced.

  Moreover, in patent document 2, only one switch is described and it is not described at all about the electricity supply between switches.

  It is an object of the present invention to provide a switchgear that can reduce energization loss between switches.

In order to solve the above-described problem, a switchgear according to the present invention includes a fixed electrode, a movable electrode disposed opposite to the fixed electrode and closed or opened with respect to the fixed electrode, and the movable electrode. Two switches each having a movable conductor to be connected, and a fixed conductor connected to the fixed electrode, and a connecting conductor for electrically connecting the two switches, the connecting conductor, It operates integrally with the movable electrode or the movable conductor of one of the switches, is slidably energized with the movable electrode of the other switch, and the other switch is covered with a solid insulator, The connecting conductor is provided with an electrode that is slidably energized with the movable electrode of the other switch, the electrode provided on the connecting conductor is inscribed in the solid insulator, and the inner circumference of the solid insulator is: Shaped so as to fit the outer periphery of the electrode provided on the connecting conductor Is characterized by comprising a guide mechanism of the operation of the electrode.

  According to the present invention, it is possible to reduce energization loss between switches.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front sectional view showing a first embodiment of a switch according to the present invention, and is a diagram showing a voltage / current input state. It is a front sectional view for demonstrating the operation | movement of the interruption | blocking state of the switch of this invention shown in FIG. It is a front sectional view for demonstrating the operation | movement of the disconnection state of the switch of this invention shown in FIG. It is a front sectional view for demonstrating the operation | movement of the earthing | grounding pre-ground state of the switch of this invention shown in FIG. It is a front cross section of 2nd Embodiment of the switch of this invention, and is a figure which shows the injection state of a voltage and an electric current.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described with reference to the drawings. The following are merely examples and are not intended to be construed as limiting the invention content to specific embodiments.

  Example 1 will be described with reference to FIGS. As shown in FIG. 1A, the switchgear in this embodiment includes a vacuum valve 8, an air ground disconnection portion 7 connected to the vacuum valve 8 via a connecting conductor 1, and a bus bushing central conductor 11. The insulating cover 13 and the cable bushing center conductor 15 are roughly configured by being integrally cast with a solid insulator 2 such as epoxy.

  The vacuum valve 8 seals both ends of the fixed-side ceramic insulating cylinder 8a and the movable-side ceramic insulating cylinder 8b joined to the fixed-side ceramic insulating cylinder 8a with the fixed-side end plate 3a and the movable-side end plate 3b. A fixed-side electrode 16, a movable-side electrode 17 disposed opposite to the fixed-side electrode 16 and closed or opened with respect to the fixed-side electrode 16, and ceramics. An arc shield 8c is provided for protecting the insulating cylinder from arcing. A fixed-side conductor 5 is connected to the fixed-side electrode 16 and is led out from the inside of the vacuum valve 8. The fixed-side conductor 5 is connected to the cable bushing center conductor 15 so that power can be supplied to the load side. A movable conductor 6 is connected to the movable electrode 17 and is led out from the inside of the vacuum valve 8. On the movable side, a bellows 22 for realizing the movement of the movable-side conductor 6 is disposed while maintaining the vacuum state in the vacuum valve 8. The vacuum valve 8 is turned off by allowing the movable electrode 17 and the movable conductor 6 to move in the axial direction while maintaining the internal vacuum by the bellows 22 connected to the movable end plate 3b and the movable conductor 6. Has been switched. In addition, a bellows shield is provided in the vicinity of the connection portion between the bellows 22 and the movable electrode 17 in order to protect the bellows 22 from an arc or the like at the time of opening and closing, and at the same time, the concentration of the electric field at the end of the bellows may be reduced. it can. A movable-side electric field relaxation shield 3c for relaxing electric field concentration at the connection portion with the fixed-side end plate 3a is disposed around the fixed-side ceramic insulating cylinder 8a, and a movable-side end is disposed around the movable-side ceramic insulating cylinder 8b. A movable-side electric field relaxation shield 4c is disposed to alleviate electric field concentration at the connection portion with the plate 3b.

  The movable conductor 6 is connected to the connecting conductor 1 on the side opposite to the side to which the movable electrode 17 is connected. The connecting conductor 1 is a rigid conductor and is formed integrally with an intermediate electrode 10 of the air ground disconnection portion 7 described below, and between the vacuum valve 8 and the air ground disconnection portion 7 via the connection conductor 1. Are electrically connected. The movable conductor 6 is connected to the vacuum valve operating rod 18 via the connecting conductor 1, and the vacuum valve operating rod 18 is connected to an operating device (not shown) via a connecting mechanism (not shown). Drives by receiving the operation force from. When the vacuum valve operation rod 18 is driven, the connecting conductor 1, the movable side conductor 6, and the movable side electrode 17 connected to the movable side conductor 6 are driven.

  The air ground disconnection portion 7 includes a bushing fixed electrode 14 that is electrically connected to the bus side via a bus bushing center conductor 11, a ground disconnection portion ground side fixed electrode 19 that is set to the ground potential, and The intermediate electrode 10 located in the middle of each of the electrodes and a grounding disconnecting portion movable conductor 4 having movable electrodes that are closed or opened with respect to these electrodes are provided. In the present embodiment, the movable electrode provided on the ground disconnection portion movable conductor 4 is composed of spring electrodes 4a and 4b. When the spring electrodes 4a and 4b are in sliding contact with the inner peripheral side of the bushing fixed electrode 14, the ground disconnection portion ground side fixed electrode 19, and the intermediate electrode 10, electricity is applied. By comprising the spring material, the contact of the ground disconnection portion movable conductor 4 is prevented from being disturbed, and the contact can be surely realized by the elastic force. The bushing fixed electrode 14, the ground disconnection portion ground side fixed electrode 19, and the intermediate electrode 10 are arranged in a straight line to realize sliding contact of the spring electrodes 4 a and 4 b, and the inner diameters of the electrodes are formed to be equal. Has been. By moving the grounding disconnection part movable conductor 4 linearly in the air grounding disconnection part 7 with respect to each of these electrodes, it is possible to switch to the closed / disconnected / grounded positions. The inside of the air ground disconnection section 7 is air-insulated.

  The ground disconnection section movable conductor 4 is connected to a ground disconnection section operation rod 25, and the ground disconnection section operation rod 25 is also connected to an operating device (not shown) via a coupling mechanism (not shown). Drive with power. When the ground disconnection portion operating rod 25 is driven, the ground disconnection portion movable conductor 4 is driven, and the spring electrodes 4a and 4b provided on the ground disconnection portion movable conductor 4 operate similarly. Although not shown in the figure, the operating device is operated separately (independently) so that the movable conductor 6 for the vacuum valve and the grounded disconnecting part movable conductor 4 of the grounding disconnecting part can be moved independently at different timings. Can be generated.

  It is electrically connected to the movable side conductor 6 on the vacuum valve side via a connecting conductor 1 that also serves as a guide for the grounded disconnecting portion movable conductor 4. At the end position of the connecting conductor 1 on the air ground disconnecting portion 7 side, a hole 1c of the connecting conductor end portion is provided so that the ground disconnecting portion movable conductor 4 can penetrate, and the ground disconnection is provided on the inner periphery of the hole 1c. An intermediate electrode 10 having a shape extending in the driving direction of the movable part conductor 4 is provided so as to be able to operate integrally with the connecting conductor 1.

The vacuum valve 8 side of the end portion of the connecting conductor 1 is fixed to the movable conductor 6 as described above, and moves with the movement of the movable conductor 6 in the axial direction. That is, the connecting conductor 1 is not a stationary conductor but a conductor that slides while operating together with a movable portion (such as a movable electrode or a movable conductor).
FIG.1 (b) is the figure which looked at the connection conductor from the operation mechanism, and shows the site | part enclosed with the broken line of Fig.1 (a). In FIG. 1B, the portion extending in the axial direction of the intermediate electrode 10 is omitted. As shown in the figure, the connecting conductor end portion edge 1d is not particularly fixed, and the operation with the movable conductor 6 is not hindered.

  When the movable conductor 6 is moved in the axial direction to switch between closing and closing, the connecting conductor 1 also operates in the axial direction. At this time, the intermediate electrode 10 provided integrally with the connecting conductor 1 is in the air ground. The intermediate electrode 10 has a length equal to or longer than the operating distance of the movable-side conductor 6 so that the contact with the spring contact of the disconnecting portion 7 can be maintained. This realizes that the connecting conductor 1 moves together with the vertical movement of the axis of the movable conductor 6 while maintaining the contact state (electrically connected) between the intermediate electrode 10 and the spring contact. Yes.

  The connection conductor 1 does not operate when the movable conductor 4 for the air ground disconnection portion operates, and when the movable conductor for the ground disconnection portion stops, the connection conductor 1 is connected to the ground disconnection portion movable conductor 4. The movable conductor 4 moves up and down in the axial direction.

  FIG. 1 (c) shows the shape of the end position of the connecting conductor 1 on the air ground disconnecting portion 7 side. The outer periphery of the intermediate electrode 10 is in contact with the inner peripheral side of the solid insulator 2 that covers the periphery of the air ground disconnection portion 7, and the recess 1 a and the protrusion 1 b are formed on the outer periphery of the intermediate electrode 10.

  As shown in FIG. 1 (d), a spring electrode 4b is provided at the end of the movable conductor 4 for the ground disconnection portion so as to be electrically closed or opened.

  FIG. 1 (e) shows the shape of the solid insulator 2 at a location in contact with the outer periphery of the intermediate electrode 10. A concave portion 2a and a convex portion 2b are formed on the inner periphery of the solid insulator 2 at the location. The concave portion 2a and the convex portion 2b formed on the inner periphery of the solid insulator 2 are formed so as to be fitted to the convex portion 1b and the concave portion 1a formed on the outer periphery of the intermediate electrode 10, respectively. Thus, when the connecting conductor 1 moves up and down in the axial direction of the ground disconnection movable member 4, the concave portion 2 a and the convex portion 2 b formed on the inner periphery of the solid insulator 2 are formed on the outer periphery of the intermediate electrode 10. The protrusions 1b and the recesses 1a are fitted to each other, so that the rotation and inclination with respect to the vertical movement can be suppressed, and the contact portion can be prevented from curling (that is, the uneven portions provided on the inner periphery of the solid insulator 2 are formed on the intermediate electrode 10). It becomes a guide mechanism).

  FIG. 2 shows a cut-off state. In the input state shown in FIG. 1, a load current is applied from the bus bushing center conductor 11 to the cable bushing center conductor 15 via the air ground disconnection portion 7 and the vacuum valve 8. In this state, when a short circuit occurs on the load side connected to the cable bushing and a large fault current flows, the fault current is cut off by shutting off the vacuum valve 8 as shown in FIG.

  FIG. 3 shows a disconnected state. The ground disconnection part movable conductor 4 and the ground disconnection part bushing fixed electrode 14, and the ground disconnection part movable conductor 4 and the ground disconnection part ground side fixed electrode 19 are not conductive, and the ground disconnection part movable conductor 4 and the ground disconnection part The grounding disconnecting portion movable conductor 4 is driven toward the controller until the gap between the bushing fixed electrode 14 is large and the gap between the grounding disconnecting portion movable conductor 4 and the ground disconnecting portion grounding side fixed electrode 19 becomes small. Due to the disconnection state.

  At this time, since the bus bushing center conductor 11 and the cable bushing center conductor 15 are disconnected at two points, that is, the vacuum valve 8 and the air ground disconnection portion 7, the reliability is high. Further, by designing the withstand voltage between the ground disconnection part movable conductor 4 and the ground disconnection part ground side fixed electrode 19 to be lower than the withstand voltage between the fixed side electrode 16 and the movable side electrode 17 of the vacuum valve 8, A highly reliable structure with a ground fault priority can be achieved.

  FIG. 4 shows a grounding state. As the previous state of grounding, the grounding disconnecting part movable conductor 4 is driven toward the operating machine side to the position where the grounding disconnecting part movable conductor 4 and the grounding disconnection part grounding side fixed electrode 19 come into contact with each other. The connection conductor 1 and the movable electrode 17 are at ground potential, and a potential difference from the load side is applied between the electrodes in the vacuum valve 8.

  When the vacuum valve 8 is turned on as shown in FIG. 5 from the previous state of grounding, the cable bushing center conductor 15 is connected to the vacuum valve 8, the connecting conductor 1, the ground disconnecting portion intermediate electrode 10, and the ground disconnecting portion movable conductor 4. The grounding disconnecting portion is grounded via the grounded fixed electrode 19. At this time, even if the cable bushing central conductor 15 is in the power-applied state, the final closing operation is performed by the vacuum valve 8, so that no short-circuit current input capacity is required for the air ground disconnection section 7.

  In order to return from the ground state to the on state again, the inside of the vacuum valve 8 is shut off, and then the ground disconnection portion movable conductor 4 is moved so that the spring electrode 4a is in contact with the bushing fixed electrode 14, and then the vacuum valve 8, the movable electrode 17 is inserted.

  Inside the switchgear, Joule heat is generated at each part where current flows, and is locally dissipated from the electrode or each conductor. As a result, the temperature of the inner conductor rises, and thermionic emission may be promoted, resulting in a decrease in insulation performance. Therefore, it is necessary to reduce the amount of heat generation (circuit resistance reduction) in order to energize a high voltage and current.

  In order to electrically connect the vacuum valve 8 and the air ground disconnection part 7 and to allow the independent movement of the movable conductors provided on both, it is necessary to use the flexible conductor 20 capable of flexible operation. Though conceivable, the flexible conductor 20 needs to have a conductor length equal to or longer than the length for connecting the conductors at the shortest distance in order to have flexibility. The longer the conductor, the longer the energization distance and the heat generation. Furthermore, the flexible conductor 20 has a shape in which thin copper plates that can be deformed flexibly are stacked so as not to suppress the vertical movement of the movable conductor 6 axis. Since the thin plate-like members are stacked, the cross-sectional area of the current is reduced, and the resistance is increased as compared with other conductors made of a rigid body.

  Here, in this embodiment, the vacuum valve 8 and the air ground disconnection portion 7 are electrically connected by the connecting conductor 1, and the connecting conductor 1 operates integrally with the movable side conductor 6 of the vacuum valve 8, Since the sliding contact is made with the spring contact as the movable electrode of the air ground disconnection portion 7, the vacuum valve 8 and the air ground disconnection portion 7 can be electrically connected without flexibility. . Therefore, it is possible to connect the vacuum valve 8 and the air ground disconnection portion 7 with the shortest distance, and since it is not necessary to stack thin plate-like members, the energization loss can be remarkably reduced.

  Example 2 will be described with reference to FIG. As shown in FIG. 5A, in this embodiment, the electrode 34b made of a spring material is provided on the inner periphery of the intermediate electrode 30, and the connecting conductor 31 and the movable conductor 34 are electrically connected. The other points are the same as in the first embodiment, and a description thereof is omitted here.

  FIG. 5B shows the shape of the end position of the connecting conductor 31. Concave portions 1 a and convex portions 1 b are formed on the outer periphery of the intermediate electrode 30 in contact with the solid insulator 2 in the air ground disconnection portion 7 as in the first embodiment. The inner circumference of the intermediate electrode 30 is a hole 1c through which the movable conductor 34 passes, and an electrode 34b made of a spring material is provided on the inner circumference.

  Also in the present embodiment, the concave portion 2a and the convex portion 2b formed on the inner periphery of the solid insulator 2 when the connecting conductor 31 moves up and down in the axial direction of the movable conductor 34 are the convex portion 1b and the concave portion formed on the outer periphery of the intermediate electrode 30. The role of a guide is fulfilled by operating while making contact with 1a. That is, the rotation and inclination with respect to the vertical movement can be suppressed, and the contact portion can be prevented from rolling.

  According to the contents typified by each of the above embodiments, it is possible to use a connection conductor having a low resistance structure capable of maximizing the current cross section, and the number of contact resistances can be minimized, so that a high voltage with high efficiency can be achieved.・ High current can be turned on, cut off, disconnected, and grounded.

DESCRIPTION OF SYMBOLS 1, 31 Connection conductor 1c Hole 2 of connection conductor end part Solid insulator 3a Fixed side end plate 3b Movable side end plate 3c Fixed side electric field relaxation shield 4 Ground disconnection part movable conductor 4a Bus side spring electrode 4b Ground side spring electrode 4c Movable Side electric field relaxation shield 5 Fixed side conductor 6 Movable side conductor 7 Air ground disconnection part 8 Vacuum valve 8a Fixed side ceramic insulating cylinder 8b Movable side ceramic insulating cylinder 8c Arc shield 10, 30 Intermediate electrode 11 Bus bushing central conductor 13 Insulating cover 14 Bushing Fixed Electrode 15 Cable Bushing Central Conductor 16 Fixed Side Electrode 17 Movable Side Electrode 18 Operating Rods 19 and 24 Grounding Disconnected Part Grounding Side Fixed Electrode 20 Flexible Conductor 22 Bellows 23 Flexible Conductor Fixed Part 34 Movable Conductors 34a and 34b Electrodes

Claims (3)

A fixed electrode;
A movable electrode disposed opposite to the fixed electrode and closed or opened with respect to the fixed electrode;
A movable conductor connected to the movable electrode;
A fixed conductor connected to the fixed electrode;
Two switches each having
A connecting conductor for electrically connecting the two switches;
The connecting conductor operates integrally with the movable electrode or the movable conductor of one of the switches, and is slidably energized with the movable electrode of the other switch ,
The other switch is surrounded by a solid insulator,
The connection conductor is provided with an electrode that is slidably energized with the movable electrode of the other switch,
The electrode provided on the connecting conductor is inscribed in the solid insulator,
The switchgear characterized in that the inner periphery of the solid insulator is formed so as to fit with the outer periphery of the electrode provided on the connecting conductor, and serves as a guide mechanism for the operation of the electrode . The switchgear according to claim 1,
One of the switches is a vacuum valve;
The other switch is a ground disconnection part that can be switched between energization, disconnection, and grounding,
The switchgear is characterized in that the solid insulator covers the periphery of the vacuum valve in addition to the ground disconnection part which is the other switch. The switchgear according to claim 2,
A switch gear characterized in that a spring contact is provided on the inner periphery of the connecting conductor.