KR100370485B1 - Vacuum switch and vacuum switchgear using the same - Google Patents

Abstract

The present invention provides a vacuum switch and a vacuum switch gear using the same that are most suitable for a water distribution system having both a simple structure and reliability.

In order to achieve the above object, the opening and closing part is assembled into a vacuum container, and the opening and closing part is provided with a circuit breaker, a grounding device, and a disconnecting device. In another chamber, the grounding device and the disconnecting unit are provided.

Description

Vacuum switch and vacuum switch gear using it {VACUUM SWITCH AND VACUUM SWITCHGEAR USING THE SAME}

Increasing demand for power consumption in the centralized areas of the metropolitan area includes coping with the difficulties in the location of distribution substations, the absence of free space for distribution line piping, and the need for high supply facility utilization rates. In order to solve these problems, it is necessary to actively absorb the load by boosting the distribution voltage, that is, a voltage system having a large capacity per line. The boosting of the distribution voltage is linked to the formation of an efficient power supply. For this reason, it is necessary to further compact the power distribution material and the water substation facility.

As the water-switched electric machine aiming to be compact, for example, the SF ₆ gas insulated switchgear described in JP-A-3-273804 can be considered. The switchgear is manufactured by separately storing breakers, two disconnectors, and a grounding switch in a unit chamber and a bus chamber filled with insulation gas in a distribution box.

A power receiving facility having a gas insulated switchgear, for example, receives electric power from a power company with a disconnector, a gas circuit breaker, etc., converts the voltage into an optimal voltage for a load by a transformer, and supplies power to a load, for example, a motor. To repair and check the water transformer, turn off the gas circuit breaker and open the circuit breaker installed separately from the gas circuit breaker. Next, by grounding the grounding switch, residual charge and induced current flow to the ground, and reapplied from the power supply is prevented to keep the worker safe. In addition, if the ground breaker is grounded while the bus is charged, an interlock is installed between the disconnector and the ground breaker.

SF ₆ gas, which is used as an insulation gas of an insulation switchgear, is being reduced worldwide from environmental impact. For this reason, a switchgear which does not use SF ₆ gas is desired.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vacuum switch and a vacuum switch gear using the same, which do not need to use an insulating gas that is concerned about the environment. Still another object is to provide a greatly miniaturized vacuum switch and a vacuum switch gear using the same. There is.

In addition, another object of the present invention is to provide a vacuum switch and a vacuum switch gear using the same, even if the vacuum of a part of the vacuum switch breaks the entire device without immediately down the whole device, another object is a breaker portion It is to provide a vacuum opening device of a bay or a vacuum opening device of only a part by a grounding device and a disconnector separately.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum switch and a vacuum switch gear using the same, and more particularly, to a vacuum switch and a vacuum switch gear using the same that are most suitable for a water distribution system having both a simple structure and reliability.

1 is a perspective view showing one embodiment of a vacuum switch of the present invention;

Fig. 2 shows an embodiment of the vacuum switch gear of the present invention, (a) is a side cross-sectional view in the state of a breaker " on ", a grounding device " off ", and a disconnector " on " Upper part cross section in

Fig. 3 shows an embodiment of the vacuum switch gear of the present invention, where (a) is a side cross-sectional view in a state of a circuit breaker " off ", a grounding device " off ", and a disconnector " on " Upper part cross section in

Fig. 4 shows an embodiment of the vacuum switch gear of the present invention, (a) is a side cross-sectional view in a state of a circuit breaker " off ", a grounding device " on ", and a disconnecting device " off " Upper part cross section in

Fig. 5 shows an embodiment of the vacuum switch gear of the present invention, wherein in the case of three phases, (a) is a side cross-sectional view in the state of a breaker " on ", a grounding device " off ", and a disconnector " on " ) Is a plan view in that state, (c) is a bottom view in that state,

Fig. 6 shows an embodiment of the vacuum switch gear of the present invention, and in the case of three phases, a side cross-sectional view in a state of a breaker " off ", a grounding device " off ", and a disconnector " on "

7 is a perspective view showing the appearance of a flexible conductor used in the apparatus of FIGS. 1 to 6.

The present invention relates to a vacuum insulated switchgear using a grounded vacuum switch. Specifically, the hermetically sealed vacuum container includes a circuit breaker, a disconnecting device, a grounding device, and a bus bar connected to the outside of the vacuum container. One end of the circuit breaker forms a movable electrode, and a fixed electrode is disposed so as to be disconnected from the movable electrode. The fixed electrode is connected to the power system.

In the present specification, a switch is a device that opens and closes a fixed electrode and a movable electrode, and a switch gear is a combination of one or more switching devices, including a control gear, one or more mechanisms for operation, measurement, protection and adjustment, and an internal connection thereof. It is an article that is stored in a closed box In addition, in the present specification, the switchgear includes an assembly of these apparatuses and apparatuses further including an accessory and a support structure in addition to the structure, and includes a control unit for controlling the operation mechanism.

In addition, in this application, the circuit breaker is a switch that is used to prevent damage caused by a large current of equipment connected in series or damage by an arc of equipment that caused an accident by quickly disconnecting a short circuit or a short circuit from a power system from the system. Appliance. In addition, the disconnector is a device that does not have a large current blocking capability, but opens and closes a charged electric circuit, and is used to ensure disconnection from a power supply when changing a circuit connection or inspecting a device. Disconnectors range from low voltage to ultra high voltage. In addition, the grounding device is a switchgear that ensures safety by grounding conductors in a voltage-free state during inspection and repair. The breaker can block all of the charging current, the normal current, and the abnormal current, and the breaker can cut off the charging current, but the normal current and the abnormal current cannot be blocked, and the grounding device can not block any of the charging, normal and abnormal currents.

The vacuum switch gear of the present invention is made by assembling the opening and closing part in a vacuum container, and having a circuit breaker, a grounding device, and a disconnecting device as the opening and closing part, dividing the vacuum container into at least two chambers, the circuit breaker in one chamber, and the grounding apparatus in another chamber. The disconnector is installed. And the main circuit member (including the bus bar and the connecting mechanism) which is connected to one end of the breaker and out of the vacuum vessel is electrically connected with a flexible member and / or one end of the grounding device and the disconnector One end is characterized in that it is electrically connected with the flexible member.

In addition, it is preferable that the vacuum switch gear is finally formed in at least two chambers, but it can be divided into the product of the breaker part only and the product of the disconnecting device and the grounding device part as required. In this case, a vacuum circuit breaker is provided, and a vacuum circuit breaker is formed by electrically connecting a circuit breaker with one end of the circuit breaker and a main circuit member passing through the vacuum chamber with a flexible member. The vacuum container is provided with a disconnecting device and a grounding device, and one end of the grounding device and one end of the disconnecting device are electrically connected with the flexible member.

In addition, it is also the scope of the present invention to manufacture and install these products separately, as well as to connect the separately obtained items to a combination or existing equipment. In the vacuum switch gear, the vacuum circuit breaker, and the electric equipment of the present invention, it is preferable to temporarily assemble them outside the furnace, and then to assemble them by heating and soldering the vacuum container (valve) and its internal parts in a vacuum chamber. For example, the flexible member is most preferably configured by interposing a brazing material between a plurality of plate-like members, and after assembling each part, heating in a vacuum stall to melt the brazing material to join the plate-shaped members together. Here, the flexible member has shown a flexible conductor by, for example, a plate laminate, but it is also assumed herein as bellows.

In another aspect of the present invention, the bushing shape is also studied. In other words, it is made by assembling the opening and closing part into the vacuum container, and the breaker, grounding device, and disconnecting device are provided as the opening and closing part, and the vacuum container is divided into at least two rooms, and the circuit breaker is installed in one chamber, and the grounding device and disconnector are installed in the other chamber. The main chamber and the voltage detection conductor are projected outward in the installed vacuum chamber, and the main circuit conductor is also projected in the vacuum chamber in which the disconnecting unit is installed. Each conductor projection is a bushing covered with an electrical insulation member. Dogs are of the same shape. Of course, this form is more effective in combination with the application of the above-mentioned flexible member.

Here, it is preferable that the flexible member used for this invention is formed from oxygen-free copper, provided with the strength which can endure the required electricity supply. Moreover, it is preferable that this flexible member is a flexible conductor which carried out the several sheets of oxygen-free copper plate, caulking both ends.

In addition, the degree of vacuum in order to ensure performance is required 1O ^-6 ~1O ^-9 torrr.

Embodiments of the present invention will be described below with reference to the drawings. 1 is a partial cross-sectional perspective view of an embodiment of a vacuum switch gear of the present invention. This example illustrates the case of one phase. 1, end parts, such as a bus bar part, a feeder side, covers, and a stopper, are abbreviate | omitted for convenience of description. Fig. 2 is a planar half cross-sectional view and a side cross-sectional view of the device of the present embodiment, and this figure shows the state of the cutoff portion "on", the disconnection portion "on", and the ground portion "off". 3 also corresponds to this, but shows the state of the cutoff portion "off", the disconnection portion "on", and the connection portion "off". In addition, similarly to FIG. 4, this figure has shown the interruption | blocking part "off", disconnection part "off", and ground part "on" state.

First, the apparatus of this embodiment divides the vacuum chamber into partition walls 3 into the first vacuum chamber 1 and the second vacuum chamber 2. The partition wall 3 is made of ceramic and is an electrical insulator. Each vacuum chamber (1, 2) is adapted to the degree of vacuum in the airtight 1O ^-6 ~1O ^-9 in that casing (not shown) and flange portion (4, 5) of each side of the bushing holding torr. In other words, the flanges 4 and 5 serve as the end walls of the vacuum vessel to form these walls, and are made of ceramic insulating material like the partition walls 3.

The circuit breaker 6 is arrange | positioned in the 1st vacuum chamber 1, the main circuit conductor 9 is also arrange | positioned, and each protrudes upward of the casing. The breaker 6 has an operation rod 14 extending upward, and the upper portion of the main circuit conductor 9 is covered with epoxy resin to form a bushing 17. On the other side of the circuit breaker 6, a movable side electrode 12 is formed at one end, and the other end is electrically connected to the main circuit conductor 9 by a flexible conductor 10. The flexible conductor 10 is mechanically tightened with a screw or the like at the lower end of the main circuit conductor 9. A fixed side electrode 13 is disposed opposite the movable side electrode 12, and the fixed side electrode ( The circuit breaker 6 is also formed, including 13). Arrow A in the figure shows the operation direction of the operating rod, and according to this operation, the cut-off part "on" state as shown in Fig. 2 (that is, the fixed electrode 13 and the movable electrode 12 are brought into contact with each other. Present state], and the cut-off "off" state as shown in FIG. 3 (that is, the operating rod 14 falls and the movable side electrode 12 is separated from the fixed side electrode 13). The upper surface of the casing of the first vacuum chamber 1 is provided with a vacuum gauge 23, a gas adsorption tower 25, and an exhaust pipe 27. This operating rod operates when an accident current flows or when an off command is issued by the manipulator (intentionally turning the breaker off due to maintenance or inspection).

An insulating plug 31 is further disposed above the bushing 17, and the main circuit conductor 9 is bent in front of the plug 31 to reach the main circuit (bus). The rubber 34 is covered for insulation from the bent portion in the direction of busbar pull out. A CT current transformer 41 is disposed around the bushing 17. The CT current transformer 41 detects a current flowing through the main circuit so that the breaker is turned off immediately when an abnormal current flows.

The terminal of the flexible conductor 10 is electrically connected to the voltage detecting conductor 15, and the voltage detecting conductor 15 is covered with a bushing 16. The bushing 16, like the others, is made of an electrically insulating epoxy. At the front end of the voltage detecting conductor 15, three capacitors 32 are arranged in series in this example. The outer side of the bushing 16 is covered with an insulating rubber 33.

A magnet 40 is arranged in a ring shape around the vacuum gauge 23. In the vicinity of the breaker 6 side connection part of the flexible conductor 10, an arc prevention cover 42 is provided, and the arc prevention cover 43 is semi-circularly shaped so as to cover most of the inner wall below the casing 44. It is.

The partition wall 3 is provided on the inner wall of the casing 44 with the fixing tool 36.

In the second vacuum chamber 2, a grounding device 7, a disconnecting device 8, a vacuum vessel end wall 5 (i.e., a flange portion of the bushing 18) are arranged in order from the partition wall 3 side, and at the end thereof. Bushings 18 are provided on the outside. The grounding device 7 is provided with an arrow B direction, i.e., a moving part, and a movable electrode 20 is formed at the lower end thereof. In addition, the fixed side electrode 19 is disposed to face the fixed side electrode 19, and the fixed side electrode 13 of the fixed side electrode 19 and the circuit breaker 6 has an electrical connection portion 45 electrically passing through the partition wall 3. Connected. The grounding device 7 is grounded by contact between the fixed-side electrode 19 and the movable-side electrode 20 by grounding as shown by arrow B, and the grounding is released by the space between them. The grounding device 7 is a concept including the fixed side electrode 13.

The disconnecting device 8 also has a portion moving in the arrow C direction. The lower end of the shanghai portion forms the movable side electrode 21, and the fixed side electrode 22 is provided opposite thereto, and it is determined whether or not the disconnection state is performed by the shanghai C. The fixed side electrode 19 of the grounding device 7 and the movable side electrode 21 of the disconnecting device 8 are connected by a flexible conductor 11. The fixed side electrode 22 is connected to the main circuit conductor 47 and the electrical connection portion 46, and is connected to the main circuit conductor 48 (the main bus) via the main circuit conductor 47.

Referring to FIG. 4, a series of conduction relations are shown. In this state of FIG. 4, since the movable side electrode 12 of the blocking portion 6 is separated from the fixed side electrode 13, the blocking portion is in an “off” state. In addition, the movable side of the interruption | blocking part 6 is a state connected to the main circuit conductor 9 and the voltage detection conductor 15 via the flexible conductor 10. FIG. Next, the grounding device 7 is in a ground state because the movable electrode 20 is in contact with the fixed electrode 19, and in the disconnector 8, the movable electrode 21 and the fixed electrode 22 are connected to the disconnect. It is disconnected because it takes enough distance. In addition, the fixed side electrode 22 reaches the bus bar as described above.

The upper surface of the casing of the second vacuum chamber 2 is provided with a vacuum gauge 24, a gas adsorption tower 26, and an exhaust pipe 28. 29 is an insulating ceramic body. The magnet 39 is arranged in a ring shape around the vacuum measuring instrument 24. The circumference of the bushing 18 is made of rubber 35 to further insulate insulation. 37 and 38 are air, that is, outdoor air flow sections.

The bushing 16 and the bushing 18 are fixed to the casing by screwing or the like with the flange portions 4 and 5, respectively. Both are the same in the dimension shape and material, ie they are common components. The bushing 17 has the same tip shape (part except the flange position equivalent part) in the same dimensions as the bushings 16 and 18. In this way, the cost can be reduced by achieving common parts. As a result, it is possible to change the arrangement of the bus bar, the feeder and the voltage detector according to the customer's requirements.

The ceramic body 30 is to insulate the electric current from the ground side so that no electric current flows through the vacuum vessel when irradiating the cable breakdown voltage.

The vacuum measuring instruments 23 and 24 use the magnetron principle. The magnets 39 and 40 are arranged in a pipe shape as an auxiliary device therefor to apply a magnetic field when measuring the degree of vacuum. However, the vacuum degree of each vacuum container 1, 2 is manufactured to be airtight so that it may be maintained more than 20 years in normal use environment.

The grounding device 7 or disconnector 8 is operated by a separate manipulator from the breaker 6.

Gas adsorption towers 25 and 26 are also called getters. The exhaust pipes 27 and 28 are for vacuum extraction or recovery.

If there are two vacuum chambers as in the present embodiment, even if the vacuum in one of the chambers collapses, the situation in which the whole apparatus goes down immediately is avoided because the other vacuum chamber maintains the vacuum. Assuming product distribution, it is also effective to manufacture and install the units of the first vacuum chamber 1 and the units of the second vacuum chamber separately, or to replace the existing equivalent parts, or to assemble and combine them both locally.

The apparatus of this embodiment is assembled in a vacuum, and the soldering work is put in a furnace which is preassembled from the outside, heated in a vacuum, molten lead and joined in place to obtain a product. Both the ceramic body and the vacuum vessel are bonded together, and the component plates of the flexible conductors 10 and l1 described below are also soldered together.

Since the flexible conductors 10 and 11 are used in the apparatus of this embodiment, the conduction can be reliably performed even during the operation, and the structure is simplified because the electricity flows reliably even during the rotation or vertical movement. In addition, since electricity flows through the flexible conductors 10 and 11, if it is taken out of the vacuum container, the part is newly covered with SF ₆ gas or a solid insulator, and is dangerous if not insulated. Therefore, when installed in the same vacuum vessel, safety can be ensured, and the apparatus is also compact.

The strength of the conductive conductors 10 and 11 is preferably at least 200 mm ² and the required electrical conductivity is 25 kA for 1 second.

In this embodiment, the lower side of the main circuit conductor 9 and the voltage detection conductor 15 are electrically connected to the flexible conductor 10, but this is the flexible conductor 10 extending from the breaker 6. It is effective utilization of the remaining part fixed by the main circuit conductor 9 in the middle. Therefore, the connection of the main circuit conductor to the voltage detection conductor does not have to use a flexible conductor. This is because they are quantum fixed and there is no necessity to make them flexible. Likewise, the electrical connection 46 need not be a flexible conductor.

The appearance of the flexible conductor is shown in FIG. In the flexible conductors 10 and 11 according to the present embodiment, a plurality of oxygen-free copper plates are laminated, and a brazing material is interposed between the plates, and both ends are soldered as shown in FIG. This soldering part 49 becomes a mounting place with respect to each electrode or conductor. On the conductor 10 side, 70 sheets of 120-130 mm in length, 30 mm in width, and 0.1 mm in thickness are stacked. The conductor 11 side has a plate having the same dimensions as the conductor 10 in addition to 60-70 mm in length. 50 sheets are overlapped, that is, the conductor 10 side following the rotation operation is long.

In addition, the present embodiment has been described with respect to a vacuum switch composed of a vacuum chamber and a breaker in which the opening and closing part is hermetically sealed in one vacuum chamber, and a disconnector and the grounding device in which the opening and closing part is hermetically sealed in the other vacuum chamber. It is also conceivable for a vacuum switch composed of a vacuum container and a circuit breaker in which the opening and closing part is hermetically sealed in the vacuum container or a vacuum switch composed of a disconnecting device and a grounding device in which the opening and closing part is hermetically sealed in the vacuum container and the vacuum container. In this case as well, the same flexible member as in the previous example is used for the electrical connection between the main circuit and the opening and closing portion or the opening and closing portion.

As mentioned above, although the example of the apparatus of one phase is performed, the example of three phases is performed to FIG. 5, FIG. In the figure, 100 is a metal storage container. The vacuum container 101 is accommodated in the storage container 100 for three phases of U, V, and W. As shown in FIG. The vacuum switch 101 has the same configuration as the above-described embodiment in all three phases, and includes a circuit breaker 6 having a breaking function, a grounding device 7 having a grounding function, and a disconnecting device 8 having a disconnecting function. . The main circuit conductor (bus) 48 is electrically connected to one end of each of the vacuum switches 101, and the main circuit conductor 9 is electrically connected to the other end.

In addition, the storage container 100 has control compartments 102, 103, and 104 which house operation mechanisms of the circuit breaker 6, the grounding device 7, and the disconnecting device 8, and gives control commands to the operation mechanisms. The protective control device 105 is housed. Each operation mechanism is a mechanism for operating each of the circuit breaker 6, the grounding device 7, and the disconnecting device 8 in three phases. The operation compartments 102, 103, 104 and the protective control device 105 are arranged in the space portion above the main circuit conductor 48 of the vacuum switch 101.

As described above, the vacuum switch gear includes the storage container 100 and the vacuum switch 101 in three phases, the main circuit conductors 9 and 48, the operation compartments 102, 103 and 104, and a protective control device. It consists of (105).

The vacuum switch of the present invention and the vacuum switch gear using the same have the effect of being excellent in environmental response and achieving miniaturization. In the case where two or more vacuum chambers are used, even if the vacuum of one chamber collapses, it is reliable in that one side maintains a vacuum, and even a part, for example, a circuit breaker part, can be evacuated without reaching the entire apparatus. It is more economical because it can realize the product type according to the demand in that it can be done.

The application of the flexible member to the breaker side contributes to the compactness of the device regardless of the rotational movement and the conduction of the breaker (switch), thereby ensuring the application of the flexible member between the grounding device and the disconnector. Provides compaction and compactness.

In addition, the commonalization of the bushing dimensions has an effect on the cost control of part sharing.

Claims (11)

delete The opening / closing part is assembled by a vacuum container, and the opening / closing part is provided with a circuit breaker, a grounding device, and a disconnecting device. The vacuum container is divided into at least two chambers, and the opening / closing portion of the circuit breaker is divided into one chamber and the other chamber. And an opening and closing portion of the grounding device and the disconnecting device, and the main circuit member communicating with one end of the circuit breaker and out of the vacuum container is electrically connected with a flexible member. The opening / closing part is assembled by a vacuum container, and the opening / closing part is provided with a circuit breaker, a grounding device, and a disconnecting device. The vacuum container is divided into at least two chambers, and the opening / closing portion of the circuit breaker is divided into one chamber and the other chamber. And an opening and closing portion of the grounding device and the disconnecting device, wherein one end of the grounding device and one end of the disconnecting device are electrically connected with a flexible member. The opening / closing part is assembled by a vacuum container, and the opening / closing part is provided with a circuit breaker, a grounding device, and a disconnecting device. The vacuum container is divided into at least two chambers, and the opening / closing portion of the circuit breaker is divided into one chamber and the other chamber. The grounding device and the opening and closing portion of the disconnecting device are installed in the main circuit, and one end of the circuit breaker and the main circuit member communicating with the outside of the vacuum container have a flexible member and are electrically connected to each other. One end of the vacuum switch characterized in that it is electrically connected with a flexible member. A vacuum switch, comprising: a breaker in the vacuum vessel, and electrically connected to one end of the breaker and the main circuit member communicating with the outside of the vacuum vessel with a flexible member. A vacuum switch, comprising: an opening and closing portion of a disconnecting device and an opening and closing portion of a grounding device in one vacuum container, wherein one end of the grounding device opening and closing portion and one end of the disconnecting device opening and closing portion are electrically connected with a flexible member. A vacuum breaker provided with an opening and closing portion of the circuit breaker in the vacuum vessel, and electrically connecting one end of the circuit breaker opening portion and a main circuit member communicating with the outside of the vacuum vessel with a flexible member; And an opening and closing portion of the grounding device, wherein one end of the grounding device opening and closing portion and one end of the disconnecting device opening portion are electrically connected to each other with a flexible member. A composite vacuum switch, characterized in that which is electrically connected at one end side. The opening / closing part is assembled by a vacuum container, and the opening / closing part is provided with a circuit breaker, a grounding device, and a disconnecting device. The vacuum container is divided into at least two chambers, and the opening / closing portion of the circuit breaker is divided into one chamber and the other chamber. The main circuit conductor and the voltage detection conductor are projected outward in the vacuum chamber provided with the grounding device and the starter of the disconnecting unit, and the opening and closing part of the circuit breaker are provided. And a projection covering each of the conductor protrusions with an electrical insulating member, wherein at least two of the bushings have the same shape. The opening / closing part is assembled into a vacuum container, and the opening / closing part is provided with a circuit breaker, a grounding device, and a disconnecting device. And an opening and closing portion of the grounding device and the disconnecting device, and one end of the circuit breaker opening and closing portion and the main circuit member communicating with the outside of the vacuum vessel are electrically connected with a flexible member, and one end of the grounding device opening and closing portion One end of the breaker opening and closing portion is electrically connected with a flexible member. The vacuum chamber provided with the opening and closing portion of the breaker protrudes the main circuit conductor and the voltage detection conductor outward, and the vacuum chamber is provided with the opening and closing portion of the disconnector. The conductor for the main circuit protrudes and each of the conductor protrusions is a bushing covered with an electrically insulating member. At least two of the bushings has a vacuum switch gear characterized in that the same shape. The method according to any one of claims 2 to 7, or 9, The flexible member is a vacuum switch or a vacuum switch gear, characterized in that it is formed of oxygen-free copper and has a cross section that can withstand the required electrical capacity. The method of claim 10, The flexible member is a vacuum switch or a vacuum switch gear, characterized in that the flexible conductor is soldered at both ends by overlapping a plurality of oxygen-free copper plate.