HK1155855B - Vacuum insulated switchgear, the production method thereof and the replacement method of the relevant components - Google Patents

Description

Vacuum insulated switchgear and method of manufacturing the same, and method of replacing and adjusting related parts

Technical Field

The present invention relates to a vacuum insulated switchgear having concentrated and partitioned functions.

Background

Vacuum insulated switchgear and existing SF₆Gas insulated switchgear, since the global warming coefficient is shown to be as high as CO without using the earth at all₂About 23900 times the value of SF₆Gas, and therefore environmentally friendly switchgear facing one era down.

Here, as a vacuum insulated switchgear, there is one described in patent document 1 (japanese patent application laid-open No. 2008-104338), for example. Patent document 1 discloses the following vacuum insulated switchgear: the vacuum insulated switchgear is divided by a grounding metal plate into a switching area section, a bus bar area section located above the switching area section, a cable area section located on one side of the switching area section, and a low voltage control area section arranged on the rear side of a door of a cabinet of the vacuum insulated switchgear and at a position facing the bus bar area section.

However, the device described in patent document 1 is always a vacuum insulated switchgear in which respective spaces are divided by a ground metal plate, and has no independent structure as a cabinet. Therefore, when a part of the vacuum insulated switchgear is damaged, the entire distribution board cannot be replaced by only the part or the equipment related thereto, and therefore, the user is burdened with the part or the equipment related thereto. Further, since the conventional vacuum insulated switchgear is integrally configured, when adjusting the bus bar connection position, it is necessary to lift the entire vacuum insulated switchgear, which becomes a burden during operation.

Disclosure of Invention

It is therefore a first object of the present invention to provide a vacuum insulated switchgear that can be exchanged for local machines. In addition, a second object of the present invention is to provide a method of manufacturing a vacuum insulated switchgear capable of replacing a local machine. Further, a third object of the present invention is to provide a method for replacing a local machine of a vacuum insulated switchgear. In addition, a fourth object of the present invention is to provide a bus bar connection position adjusting method of a vacuum insulated switchgear for adjusting a bus bar connection position by lifting a part of the vacuum insulated switchgear.

In order to achieve the first object, a vacuum insulated switchgear according to the present invention is characterized in that: the vacuum switch is provided with at least a vacuum switch for switching on and off current, and a switch unit for accommodating an operator for operating the vacuum switch is assembled in a box shape and can be assembled to a vacuum insulated switchgear.

In order to achieve the second object, a method for manufacturing a vacuum insulated switchgear according to the present invention is a method for manufacturing a vacuum insulated switchgear in which the following components are combined to form a vacuum insulated switchgear: a switch unit for accommodating a switch for switching on and off a current and an operator for operating the switch; a cable connection unit for receiving a cable for supplying power to a load side; a low voltage control part for accommodating the protective relay; a wiring connection portion for connecting wiring between machines through the inside thereof; the switch unit, the cable connection unit, the low-voltage control unit, and the wiring connection unit are all assembled in an independent box shape, and after the switch unit is disposed, a part of the cable connection unit is placed on the switch unit, a part of the low-voltage control unit is placed on the switch unit, and the wiring connection unit is disposed between the cable connection unit and the low-voltage control unit.

In order to achieve the third object, a method of replacing a switch unit of a vacuum insulated switchgear according to the present invention is characterized in that, in a vacuum insulated switchgear including a switch unit divided into a box shape, a cable connection unit, a low voltage control unit, and a wiring connection unit, after a switch in the switch unit is operated to a disconnection position, the cable in the cable connection unit is detached, doors on the front and back sides of the low voltage control unit are opened, a bus bar is detached, and a connector between the low voltage control unit and the switch unit is detached, and then the switch unit is replaced.

In order to achieve the fourth object, a bus bar connection position adjusting method of a vacuum insulated switchgear according to the present invention is a bus bar connection position adjusting method of a vacuum insulated switchgear in which a switch unit, a cable connection unit, a low voltage control unit, and a wiring connection unit, which are divided into a box shape, are connected, wherein the switch unit, the cable connection unit, the low voltage control unit, and the wiring connection unit are connected after a bus bar connection position is adjusted by raising and lowering a base provided at a bottom portion of the switch unit.

According to the present invention, a vacuum insulated switchgear capable of replacing a local machine can be provided.

In addition, according to the present invention, a vacuum insulated switchgear in which a local machine can be replaced can be manufactured.

In addition, according to the invention, the machine of the partial vacuum insulated switchgear can be replaced.

In addition, according to the present invention, the bus bar connection position can be adjusted by lifting and lowering a part of the vacuum insulated switchgear.

Drawings

Fig. 1 is a perspective view of a vacuum insulated switchgear according to a first embodiment of the present invention.

Fig. 2 is a side view, partially in section, of a vacuum insulated switchgear according to a first embodiment of the present invention.

Fig. 3 is a front view of a switching section of a vacuum insulated switchgear constituting a first embodiment of the present invention.

Fig. 4 is a front view showing a partial cross section of a switching section of a vacuum insulated switchgear constituting a first embodiment of the present invention.

Fig. 5 is a side view showing a state where a cable is drawn upward in a partial cross section for the vacuum insulated switchgear of the first embodiment of the present invention.

Fig. 6 is a side view showing a case where a ventilation opening is adopted in the vacuum insulated switchgear according to the first embodiment of the present invention in a partial cross section.

Fig. 7 is a side view, partially in section, of a vacuum insulated switchgear of a second embodiment of the present invention.

In the figure: 1-vacuum insulated switchgear, 1 a-bus connection part, 1 b-switch part, 1 ba-module switch, 1 bb-decorative plate, 1 bc-state display part, 1 bd-manual operation part, 1 be-emergency operation part, 1 bf-elevator claw insertion part, 1bg, 1 dd-connector, 1 c-cable connection part, 1 d-low voltage control part, 1 da-door, 1 db-protective relay, 1 dc-alarm display part, 1 e-wiring connection part, 1 ea-vent, 2b, 2c, 2d, 2 e-grounding metal plate, 2 da-cover, 3-cable, 4-Current Transformer (CT), 5-bus, 5 a-bus connection insulating sleeve, 6c, 6 d-partition plate, 8-operator, 9-vacuum earthing switch, 10-voltage detector, 11-operator, 11 a-control unit, 11 aa-control board, 11 ab-capacitor, 12-epoxy resin, 20-T cable connector, 20 a-cable connection insulating sleeve, 80, 91-vacuum container, 80a, 91 a-insulating cylinder, 81a, 81b, 92-fixed contact, 82a, 82b, 93-movable contact, 83, 84-feeder, 85-movable conductor, 86, 94-vacuum insulating operating lever, 86 a-connecting rod, 87, 95-metal bellows, 88-air insulating operating lever, 89-bellows, 90, 97-arc shield, 111-operating lever, 112-insulating operating lever, 200-first operating mechanism, 201, 401-lever, 300-second operating mechanism, 400-third operating mechanism.

Detailed Description

A first embodiment will be described with reference to fig. 1 to 6. The vacuum insulated switchgear 1 of the present embodiment is configured by a region in which four functions, i.e., the switch unit 1b, the cable connection unit 1c, the low voltage control unit 1d, and the wiring connection unit 1e, are integrated and assembled in a box shape. In the four respective areas, the switch unit 1b is disposed on the lower front side of the vacuum insulated switchgear 1, and the cable connection unit 1c is disposed on the switch unit 1b in a state where a part thereof is mounted on the rear side of the vacuum insulated switchgear 1 via the partition plate 6 c. The length of the partition plate 6c is such that the cable connecting portion 1c can be supported by the switch portion 1 b. The low-voltage control unit 1d is disposed on the upper front side of the vacuum insulated switchgear 1 with a part thereof being mounted via the partition plate 6 d. The length of the partition plate 6d is such that the low voltage control section 1d can be supported by the switch section 1 b. The wiring connection portions 1e are central upper portions of the vacuum insulated switchgear 1, and are respectively disposed between the cable connection portions 1c and the low voltage control portion 1 d. The regions are mechanically connected to each other by bolts. The two regions of the switch unit 1b and the low voltage control unit 1d are surrounded by the ground metal plates 2b and 2d, and airtightness is maintained.

Next, each region will be described.

The switch unit 1b is provided with: a vacuum double-pole three-position type on-off switch 8 which is turned on, off, and off by two contacts arranged in parallel in a vacuum container under a vacuum insulation condition; a vacuum grounding switch 9 connected to the load side of the vacuum double-pole three-position switch 8 and grounded in a vacuum container under vacuum insulation conditions; a voltage detector 10 disposed on the cable side for measuring the amount of power supplied to the load side; a three-phase bus connection insulating sleeve 5a connected to the bus side and supplying power to the vacuum double-pole three-position type on-off switch 8; an insulating sleeve 20a for connecting a three-phase cable connected to the cable side; the vacuum double-pole three-position type on-off switch 8, the vacuum earthing on-off switch 9, the voltage detector 10, the bus bar connection insulating sleeve 5a, and the cable connection insulating sleeve 20a are molded integrally with an epoxy resin 12 to constitute a module switch 1 ba. The bus bar connecting insulating sleeve 5a protrudes above the vacuum double-pole three-position type on-off switch 8 toward the bus bar connecting portion 1a existing as a space above the switch portion 1b, and when the grounding metal plate 2d located at the boundary portion between the low-voltage control portion 1d and the bus bar connecting portion 1a, which will be described later, is removed, the bus bar connecting operation can be performed by reaching the bus bar connecting portion 1a from the front of the low-voltage control portion 1 d. The cable connection insulating sleeve 20a protrudes toward the cable connection portion 1 c. An operating device 11 for driving the vacuum double-pole three-position type on-off switch 8 and the vacuum grounding on-off switch 9 and a control device 11a for the operating device are also disposed in the switch unit 1b, and a connector 1bg is disposed facing the low voltage control unit 1 d. In order to ensure the rigidity of the switch unit 1b, the grounding metal plate 2b is formed as a thick plate and is bent at a plurality of positions.

The cable connection unit 1c includes: a T-shaped cable connector 20 rotatably provided with respect to a cable connection insulating sleeve 20a protruding from the switch unit 1 b; a cable 3 connected to the T-shaped cable connector 20 and supplying power to a load side; a Current Transformer (CT)4 for detecting fault currents.

In the low voltage control unit 1d, a protective relay 1db disposed on the back side of a door 1da on the front surface side of the distribution board and a connector 1dd disposed facing the switch unit 1b are disposed, and the switch unit 1b and the low voltage control unit 1d are electrically connected by fitting the connector 1dd to the connector 1bg at the time of assembly. In addition, an alarm display portion 1dc for displaying grounding, short-circuit accident, vacuum pressure abnormality, and the like is disposed on the front surface of the door 1da on the front side (i.e., outside the distribution board). These components are fixed to the back surface of the door 1da on the front surface side of the low-voltage control unit 1d, and are pulled out to the outside of the vacuum insulated switchgear by opening the door 1 da. The grounding metal plate 2d located at the boundary between the low-voltage control section 1d and the bus bar connection section 1a is a detachable cover.

The wiring between the devices is connected to the inside of the wiring connection portion 1 e.

Here, the above-described block switch 1ba will be described in detail with reference to fig. 4. The vacuum double-pole three-position type on-off switch 8 is composed of the following components: a vacuum vessel 80 which is composed of an insulating cylinder 80a and a metallic end plate and has a vacuum inside; two pairs of fixed contacts 81a and 81b disposed in the vacuum chamber 80; movable contacts 82a and 82b disposed to face the fixed contacts 81a and 81 b; a movable conductor 85 which is connected to the two movable contacts 82a and 82b, is movable by being driven by the actuator 11, and is reinforced with a metal which is not annealed even at high temperature, such as stainless steel; a vacuum insulation operation rod 86 connected to the movable conductor 85 and disposed in the vacuum chamber 80; a connecting rod 86a connecting the vacuum insulation operating rod 86 and the operator 8 side; in addition, an air insulation operation rod 88 connecting the connection rod 86a and the operator 11; a rubber or metal bellows 87 that can operate the connection rod 86a while maintaining a vacuum-tight state; a rubber or metal bellows 89 covering the periphery of the connection portion between the air insulation operation rod 88 and the connection rod 86 a; and an arc shield 90 disposed inside the vacuum chamber 80 for preventing an arc from adhering to the insulating cylinder 80a when the contacts are opened and closed.

One fixed contact 81a is connected to the bus bar 5 via a feeder 83, and the other fixed contact 81b is connected to the T-shaped cable connector 20 via a feeder 84.

The vacuum earthing switch 9 is constituted by: a vacuum vessel 91 composed of an insulating cylinder 91a and a metallic end plate and having a vacuum inside; a fixed contact 92 disposed in the vacuum chamber 91; a movable contact 93 disposed opposite to the fixed contact 92; a vacuum insulation operation rod 94 connected to the movable contact 93; a metal bellows 95 which can operate the vacuum insulated operating rod 94 while maintaining a vacuum-sealed state; and an arc shield 97 disposed inside the vacuum chamber 91 and preventing an arc from adhering to the insulating cylinder 91a when the contacts are opened and closed.

Next, switching is performed at three positions, namely, a closed position for energizing the vacuum two-pole three-position type on-off switch 8, an open position for interrupting a load current or an accident current, and an open position for securing safety of a surge voltage to lightning or the like by an inspection operator, and on and off of the vacuum earthing on-off switch 9 is operated by the operation device 11 through the levers 201 and 401. As shown in fig. 3, the operation device 11 is composed of: a first operating mechanism 200 for switching the electromagnetic operation mode of the movable contact of the operation switch substantially between the closed position and the open position; a second operating mechanism 300 for switching the electromagnetic operation mode of the movable contact of the operating switch between the closed position and the open position; a third operating mechanism 400 of a manual operating type for operating the movable contact of the earthing switch; and a control device unit 11a for electrically operating the first and second operating devices. The control device unit 11a includes a control board 11aa and a capacitor 11 ab.

The first operating mechanism 200 and the third operating mechanism 400 may be appropriately arranged and changed. Further, although the first operating mechanism 200 is of an electromagnetic operating type, it may be of another operating type such as an electric spring type.

Here, a method of assembling the vacuum insulated switchgear 1 will be explained. The assembly method includes a method of manufacturing a finished product of the vacuum insulated switchgear 1 in a factory and transporting the finished product to a site, and a method of manufacturing a finished product by manufacturing the finished product into a modular component in the above-described housing unit and connecting the housing components to each other in the site.

First, a method of manufacturing the vacuum insulated switchgear 1 of the present embodiment in a factory, and transporting and assembling a finished product to a site will be described. First, the respective chambers are modularized through the respective steps. Next, the cable connection unit 1c is mounted on the manufactured switch unit 1 b. At this time, as shown in fig. 1, a part of the cable connection portion 1c is mounted on the upper portion of the switch portion 1b via a spacer. Thereafter, the wiring connection unit 1e is attached to the cable connection unit 1c, and finally, the low-voltage control unit 1d is attached to the switch unit 1b and the wiring connection unit 1 e. At this time, part of the low-voltage control unit 1d is mounted on the upper part of the switch unit 1b via a diaphragm. When the switch unit 1b and the low-voltage control unit 1d are mounted, they are mechanically mounted and electrically connected to each other by a connector. The vacuum insulated switchgear 1 manufactured by connecting the thus-modularized components is transported to the site. After the conveyance, the switch unit 1b is fixed to the mounting base (base). After the fixing, the height of the entire switchboard is adjusted by adjusting the base, and the bus bar connection position is determined. After the bus bar connection position is determined, the front door of the low voltage control unit 1d is opened, and the bus bar room side cover located on the back side of the low voltage control unit 1d is removed to connect the bus bars. After the bus bar connection, the bus bar room side cover is mounted again. In this case, instead of detaching the bus bar room side cover, the low voltage control unit 1d itself that has been attached may be detached at a time and attached again after the bus bar connection. Next, the rear cover of the cable connection portion 1c is removed to connect a cable, and the cable is assembled by connecting a power supply, a CT device, and the like, and wiring.

Here, although the example in which the switch unit 1b is mounted in the order of the cable connection unit 1c → the wiring connection unit 1e → the low-voltage control unit 1d among the components assembled into a module has been described, the mounting order may be changed.

Next, a method of manufacturing a finished product by manufacturing the unit of a housing and connecting the modular housing modules to each other on site will be described. In this case, as in the above method, first, each chamber is manufactured in each step. These individual compartments are transported to the site in compartment units. In each chamber, the switch unit 1b is first fixed to a base (base). After the fixing, the height of the switch unit 1b is adjusted by adjusting the base, thereby adjusting the bus bar connection position. After the bus bar connection position is determined, the bus bar is connected. After the bus bars are connected, the assembled cable connection unit 1c, wiring connection unit 1e, and low-voltage control unit 1d are connected to the switch unit 1b, respectively, to assemble the vacuum insulated switchgear 1. At this time, as shown in fig. 1, part of the cable connection unit 1c is mounted on the upper portion of the switch unit 1b via a spacer, and part of the low-voltage control unit 1d is mounted on the upper portion of the switch unit 1b via a spacer. When the switch unit 1b and the low-voltage control unit 1d are mounted, they are mechanically mounted and electrically connected to each other by a connector. The cable connection unit 1c, the wiring connection unit 1e, and the low-voltage control unit 1d may be mounted to the switch unit 1b in any order. Thereby, the assembly on site is completed.

Here, a method of replacing the containers will be described.

First, a method of replacing the switch unit 1b will be described. When the modular switch unit 1b is replaced, the switch is turned off, and the control power supply is turned off by checking whether or not a voltage is applied to the circuit. Next, the rear cover is removed from the cable connection portion 1c connected to the switch portion 1b, and the cable is removed. In this case, even when a CT or the like is connected, the CT or the like needs to be detached. Next, the front door of the low voltage control unit 1d is opened, the bus bar room-side cover located on the back side of the low voltage control unit 1d is removed, and the bus bar is removed. Next, the connector electrically connecting the low voltage control unit 1d and the switch unit 1b is removed, and when a panel is provided between the panel and the adjacent distribution board, the panel is also removed. After that, the bolt for fixing the low-voltage control unit 1d and the switch unit 1b is removed, and similarly, the bolt for fixing the cable connection unit 1c and the switch unit 1b is also removed. Then, of the decorative plates provided on the front surface of the below-described switch unit 1b, the decorative plate at the lowermost portion is removed so that the claws of the lifter can be inserted into the claw insertion portions 1bf of the lifter. The assembled switch unit is pulled out from the front side by inserting the claw of the elevator into the elevator claw insertion unit 1 bf. When reassembling, it is sufficient to insert a repair product or a new product in the reverse order of the present order.

In the above-described procedure, when the bus bar is removed, the low voltage control unit 1d itself is not removed and the operation is performed, but when the bus bar is removed, the low voltage control unit 1d which is assembled into a module may be removed at a time, and after the switch unit 1b is pulled out, the low voltage control unit 1d may be attached again or after a new switch unit 1b is replaced, the low voltage control unit 1d may be attached.

Next, a method of replacing the low voltage control unit 1d will be described. In this case, as in the case of the switch unit 1b, when the switch unit 1b is replaced, the switch is turned off, and the control power supply is turned off by checking whether or not a voltage is applied to the circuit. Next, the front door of the low voltage control unit 1d is removed, and the wiring and the connector connected to the low voltage control unit 1d are removed. After that, when the bolt for fixing between the switch unit and the wiring connection unit is removed and the panel is provided between the switch unit and the adjacent distribution board, the bolt for installing the panel needs to be removed together. After that, the low-voltage control unit 1d is pulled out from the front. When reassembling, it is sufficient to insert a repair product or a new product in the reverse order of the present order.

A method of replacing the cable connection unit 1c will be described. In this case, as in the case of the switch unit 1b, when the switch unit 1b is replaced, the switch is turned off, and the control power supply is turned off by checking whether or not a voltage is applied to the circuit. Next, the rear cover of the cable connection portion 1c is removed, and the cable is removed. In this case, even when a CT or the like is connected, the CT or the like needs to be detached. After that, when the bolt for fixing between the switch unit and the wiring connection unit is removed and the panel is provided between the switch unit and the adjacent distribution board, the bolt for installing the panel needs to be removed together. After that, the assembled cable connection portion 1c is pulled out from the back surface. When reassembling, it is sufficient to insert a repair product or a new product in the reverse order of the present order.

Further, by insulating the phases with a resin mold, making the contact spaces vacuum-insulated, and changing the size and number of electrodes between the electrodes, the relationship "phase insulation > inter-electrode insulation at the time of disconnection > inter-electrode insulation of ground switch" can be set, and coordination of insulation between the phases can be realized. This can suppress the fault to be at least one-line grounded, and can prevent the spread of the fault. Further, since the air-insulated operating rod 88 is covered with the rubber or metal bellows 89 and is blocked from the outside air, insulation reliability for long-term use can be secured.

As shown in fig. 1, the decorative plate on the front surface of the switch unit 1b is divided into three parts according to functions. That is, the upper side is a state display unit 1bc for displaying what state the switch unit 1b is on, off, broken, and grounded, and a manual operation unit 1bd for operating the third operation mechanism 400 of the manual operation mode, the lower side is an emergency operation unit 1be for manually tripping the first operation mechanism 200 in an emergency, and the lower side is an elevator claw insertion unit 1bf into which a claw of an elevator can be inserted in order to use the transporting elevator in transporting the switchboard. These are covered except when in use. Thus, the cover can be separated into different parts according to the use condition, and each part can be covered except in the use state. This prevents malfunction due to erroneous contact or the like, and reduces the risk of damage to other parts of the decorative panel during conveyance by the lifter. Further, by providing the elevator claw insertion portion 1bf not on the floor but in the space below the distribution board, it is not necessary to lift a portion corresponding to the height of the elevator claw insertion portion as compared with the case where the elevator claw insertion portion is provided on the floor, thereby improving the stability during transportation. Further, since the elevator claw insertion portion 1bf is provided in the lower space of the switchboard, the regions can be connected to each other while maintaining the state in which the elevator is inserted (i.e., while maintaining the fine adjustment state), and therefore, the work of combining and connecting the positions of the regions becomes significantly easy.

In the above embodiment 1, four areas, i.e., the switch unit 1b, the cable connection unit 1c, the low voltage control unit 1d, and the wiring connection unit 1e, constituting the vacuum insulated switchgear 1 are independent and modularized housings having functions concentrated in the respective areas. As a result, each region can be assembled at the same time, and work efficiency and productivity can be improved.

In addition, since the switchgear is required to change the arrangement of the devices according to the customer's request, it is necessary to manufacture the switchgear from the beginning after receiving the customer's request, but by concentrating and localizing the devices as in the present embodiment, it is possible to assemble the switchgear in advance for each of the customer switch units 1b that are difficult to change, and to manufacture the switchgear quickly. In addition, the area without change can be produced in large scale, and the production cost can be greatly reduced. In addition, conventionally, even when a local damage is caused to the distribution board, the entire distribution board must be replaced, which is a large burden for the user. In addition, when the switch, the operator, the control board of the operator, and the capacitor, which have the similar lives, are housed in the switch unit 1b by the localization, the reset can be completed by replacing only the switch unit 1b, which reduces the burden particularly on the user.

Further, by performing final assembly on site, it is possible to carry the switchboard in each small area as compared with the size of the entire switchboard, and the carrying work is significantly facilitated in a case where the switchboard is grounded in a narrow building, for example.

Further, by limiting the portion fixed to the base (base) to the switch section 1b, the area of the base (base) can be reduced as compared with the case where the entire distribution board is fixed to the base (base), and the cost of the portion can be reduced.

In addition, as for the method of assembling the vacuum insulated switchgear 1 on the spot, the above-mentioned two methods are used, and in the method of connecting the cabinets on the spot, since only the height of the assembled switching unit 1b needs to be adjusted, there are significant advantages in terms of weight surface, positioning accuracy, and the like, compared with the case where the entire distribution board needs to be lifted and lowered even when the height adjustment of the bus bar connection position by the foundation (base). In the method of connecting between the cabinets on site, since the low-voltage control unit 1d is not present in advance when the bus bars are connected, a wide work space for connecting the bus bars can be secured, which also makes it possible to significantly improve work efficiency. Further, when the transportation is performed in a unit of a modularized cabinet, the degree of freedom of the transportation is increased in terms of, for example, a method of loading, stability, and the like, and the transportation cost itself can be reduced.

Further, although it is difficult to secure strength by the area unit configuration device, heavy module switch 1ba and the operator are concentrated on switch unit 1b, and in order to secure strength of switch unit 1b, grounding metal plate 2b is thick and has a plurality of bends, so that strength required for cable connection unit 1c, low voltage control unit 1d, and wiring connection unit 1e, which are areas other than switch unit 1b, is reduced, that is, the plate surrounding the periphery can be made thin or the bending can be reduced. By concentrating the region requiring strength in the switch unit 1b in this way, the number of components can be reduced as a whole, and the thickness can be reduced, thereby reducing the size and weight of the region other than the switch unit 1 b. As a result, the entire vacuum insulated switchgear 1 can be reduced in size and weight, and manufacturing costs can be reduced.

In the above embodiment, the cable connection unit 1c and the low-voltage control unit 1d are partially mounted on the switch unit 1b, and the switch unit that is the heaviest part is also loaded with the weight of the cable connection unit 1c and the low-voltage control unit 1 d. This can further reduce the strength of the portion other than the switch portion 1 b.

Further, since the switch unit 1b, the bus bar connection unit 1a, and the low voltage control unit 1d, which are likely to be affected by external noise and temperature, which house the module switch 1ba and the operating device 11 as the current conducting units, are surrounded by the grounding metal plates 2b and 2d to maintain airtightness, even when an accident occurs in the switch unit 1b or the low voltage control unit 1d, the switch unit 1b or the low voltage control unit 1d can be prevented from being expanded to other areas. In addition, the precision instruments in the low-voltage control unit, which are susceptible to the influence of the surrounding magnetic field, are shielded from the surroundings by the grounding metal plate 2d, thereby preventing the magnetic force from entering, and as a result, preventing the precision instruments from malfunctioning.

In addition to the above-described configuration, in one embodiment of the present invention, the regions are mechanically connected by bolting, and the switch unit 1b and the low-voltage control unit 1d are electrically connected by connecting the connector 1bg and the connector 1dd, so that the switch unit is easily attached and detached. As a result, the removal at the time of maintenance and inspection becomes easy, and the arrangement between the areas becomes easy to change, so that it is possible to flexibly cope with various specifications requested by the customer, and it is possible to shorten the delivery date. In addition, the manufacturing cost can be reduced by simplifying the change of the arrangement.

As shown in fig. 6, ventilation openings 1ea formed in a grid pattern may be added to the top of the wiring connection portion 1 e. This can increase the amount of ventilation to the bus bar connecting portion 1a, and can suppress a temperature increase in the bus bar connecting portion 1a when the bus bar current is increased.

Further, since the protective relay 1db and the alarm display portion 1dc are drawn out to the outside of the switchgear by opening the front side door 1da, and the ground metal plate between the low voltage control portion 1d and the bus bar connection portion 1a is a detachable cover, a working space for the bus bar connection work can be secured even in a state where the low voltage control portion 1d is attached, and as a result, the bus bar connection work can be easily performed.

Further, since the bus bar 5 and the bus bar connecting portion 1a are disposed above the vacuum double-pole three-position type on-off switch 8, they are located at a height of the chest of the operator, and the workload of the operator can be reduced.

In the present embodiment, the switch unit 1b, the cable connection unit 1c, the low-voltage control unit 1d, and the wiring connection unit 1e are all assembled in a box shape, but it is advantageous that only one area is assembled in a box shape because only the area can be replaced. Among them, it is in accordance with customer's requests to modularize the switch unit 1b, which is highly likely to be damaged by repeated opening and closing operations, into a box shape.

The second embodiment will be described with reference to fig. 7. In the present embodiment, a vacuum single-pole three-position type opening/closing switch 108 is used as the switch. In this way, a vacuum single-pole three-position type opening/closing switch can be used as the switch to be zoned.

In the above embodiments, the vacuum double-pole three-position type opening/closing switch 8 or the vacuum single-pole three-position type opening/closing switch 108 is used, but it goes without saying that the vacuum double-pole three-position type opening/closing switch is applicable to the above embodiments, even if the vacuum double-pole three-position type opening/closing switch is not a single-pole type opening/closing switch, a double-pole type opening/closing switch, or a three-position type opening/closing.

Claims (14)

1. A vacuum insulated switchgear, characterized in that,

the structure is as follows: at least comprises a vacuum switch for switching on and off current, a switch unit for accommodating an operator for operating the vacuum switch is assembled into a box shape and can be assembled on a vacuum insulated switchgear,

the vacuum insulated switchgear further includes a low voltage control unit that houses the protection relay, and a cable connection unit that houses a cable that supplies power to the load side, the switch unit is disposed on a lower side of a front surface of the vacuum insulated switchgear, the cable connection unit is disposed on a rear surface side of the vacuum insulated switchgear in a state where a part thereof is placed on the switch unit by the diaphragm, the low voltage control unit is disposed on an upper side of the front surface of the vacuum insulated switchgear in a state where the part thereof is placed on the switch unit by the diaphragm, the switch unit, the cable connection unit, and the low voltage control unit are configured by being assembled into an independent box shape, and a strength of the switch unit is higher than a strength of any one of the low voltage control unit and the cable connection unit.

2. A vacuum insulated switchgear, characterized in that,

the disclosed device is provided with: a switch unit for accommodating a switch for switching on and off a current and an operator for operating the switch;

a cable connection unit for receiving a cable for supplying power to a load side;

a low voltage control part for accommodating the protective relay; and

a wiring connection portion for connecting wiring between machines through the inside thereof;

the switch unit, the cable connection unit, the low voltage control unit, and the wiring connection unit are each formed by assembling into an independent box,

the switch unit is disposed on the lower side of the front surface of the vacuum insulated switchgear, the cable connection unit is disposed on the rear surface side of the vacuum insulated switchgear in a state of being partially mounted on a partition, the low voltage control unit is disposed on the upper side of the front surface of the vacuum insulated switchgear in a state of being partially mounted on a partition, the low voltage control unit is partially mounted on the switch unit, and the strength of the switch unit is higher than the strength of either the low voltage control unit or the cable connection unit.

3. Vacuum insulated switchgear according to claim 1 or 2,

the switch unit and the low-voltage control unit are hermetically sealed by a grounded metal plate.

4. Vacuum insulated switchgear according to claim 3,

the switch unit, the cable connection unit, the low voltage control unit, and the wiring connection unit are fixed by bolting, and the switch unit and the low voltage control unit are electrically connected by a connector.

5. A vacuum insulated switchgear, characterized in that,

the disclosed device is provided with: a switch unit disposed on the lower front side and accommodating: a module switch part which is used for conducting the connection, disconnection and grounding of current and is covered by a solid insulator; an operator for operating the module switch part; a control device for controlling the operation device for operating the connector and the module switch in the switch part;

a cable connection portion disposed on the rear surface side and accommodating a cable for supplying power to the load side;

a low voltage control unit disposed on the upper front side and housing: a protection relay, an alarm display part for displaying the abnormal state of the vacuum insulation switch equipment, and a low voltage control part inner connector electrically connected with the switch part inner connector;

a wiring connection part arranged on the central upper side and used for connecting the wiring between the machines and passing through the inside; and

a bus bar connecting part arranged above the switch part;

the switch unit, the cable connection unit, the low voltage control unit, and the wiring connection unit are each formed by assembling into an independent box,

the switch unit is disposed on the lower side of the front surface of the vacuum insulated switchgear, the cable connection unit is disposed on the rear surface side of the vacuum insulated switchgear in a state of being partially mounted on a partition, the low voltage control unit is disposed on the upper side of the front surface of the vacuum insulated switchgear in a state of being partially mounted on a partition, the low voltage control unit is partially mounted on the switch unit, and the strength of the switch unit is higher than the strength of either the low voltage control unit or the cable connection unit.

6. The vacuum insulated switchgear according to claim 5,

the front of above-mentioned switch portion is provided with the decorative board, is equipped with on this decorative board: a state display part of the switch part and an operation part for operating the manual operation device, an emergency operation part for operating the manual operation device to cut off the current in emergency, and a claw insertion part for inserting the claw of the conveyor when the vacuum insulation switch device is conveyed; the state display unit and the operation unit are provided on the decorative panel at an upper portion of the decorative panel, the emergency operation unit is provided at a middle portion of the decorative panel, the jaw insertion unit is provided at a lower portion of the decorative panel, and the emergency operation unit and the jaw insertion unit are provided with covers, respectively.

7. The vacuum insulated switchgear according to claim 6,

the switch unit includes a vacuum insulated three-position switch that is switched among three positions of on, off, and off of current by vacuum insulation and includes a plurality of contacts, and a vacuum grounding switch that includes a contact in a vacuum container and grounds the contact.

8. A method for manufacturing a vacuum insulated switchgear, which combines the following parts to form the vacuum insulated switchgear: a switch unit for accommodating a switch for switching on and off a current and an operator for operating the switch; a cable connection unit for receiving a cable for supplying power to a load side; a low voltage control part for accommodating the protective relay; a wiring connection portion for connecting wiring between machines through the inside thereof; it is characterized in that the preparation method is characterized in that,

the switch unit, the cable connection unit, the low-voltage control unit, and the wiring connection unit are all assembled in an independent box shape, and after the switch unit is disposed, a part of the cable connection unit is placed on the switch unit, a part of the low-voltage control unit is placed on the switch unit, and the wiring connection unit is disposed between the cable connection unit and the low-voltage control unit,

the switch unit is disposed on the lower side of the front surface of the vacuum insulated switchgear, the cable connection unit is disposed on the rear surface side of the vacuum insulated switchgear in a state of being partially mounted on the switch unit via the spacer, and the low-voltage control unit is disposed on the upper side of the front surface of the vacuum insulated switchgear in a state of being partially mounted on the spacer.

9. A method for replacing a switch part of a vacuum insulated switchgear,

the vacuum insulated switchgear is provided with a switch unit for switching on, off and breaking current, a cable connection unit for accommodating a cable for supplying power to a load side, and a low voltage control unit, and the switch unit, the cable connection unit, and the low voltage control unit are assembled into an independent box,

after the current is cut off in the switch part,

the cable in the cable connecting part is detached,

after the removal of the attached bus bar,

the switch part is pulled out, and the repaired switch part or a new switch part is inserted to replace the modularized switch part,

the switch unit is disposed on the lower side of the front surface of the vacuum insulated switchgear, the cable connection unit is disposed on the rear surface side of the vacuum insulated switchgear in a state where a part thereof is mounted on the switch unit via a spacer, the low voltage control unit is disposed on the upper side of the front surface of the vacuum insulated switchgear in a state where a part thereof is mounted on the spacer, and the part of the low voltage control unit is mounted on the switch unit, thereby increasing the strength of the switch unit so that the strength thereof is higher than that of either the low voltage control unit or the cable connection unit.

10. A method for replacing a switch part of a vacuum insulated switchgear,

the vacuum insulated switchgear is provided with a switch unit for switching on, off and breaking current, a cable connection unit for accommodating a cable for supplying power to a load side, and a low voltage control unit, and the switch unit, the cable connection unit, and the low voltage control unit are assembled into an independent box,

after the current is cut off in the switch part,

the cable in the cable connecting part is detached,

detaching the connector between the low voltage control part and the switch part,

after the low-voltage control part is detached,

inserting the elevator claw into an elevator claw insertion part arranged on one surface of the switch, pulling out the switch part by pulling out the elevator, then replacing the modularized switch part by inserting the repaired switch part or a new switch part,

the switch unit is disposed on the lower side of the front surface of the vacuum insulated switchgear, the cable connection unit is disposed on the rear surface side of the vacuum insulated switchgear in a state where a part thereof is mounted on the switch unit via a spacer, the low voltage control unit is disposed on the upper side of the front surface of the vacuum insulated switchgear in a state where a part thereof is mounted on the spacer, and the part of the low voltage control unit is mounted on the switch unit, thereby increasing the strength of the switch unit so that the strength thereof is higher than that of either the low voltage control unit or the cable connection unit.

11. A method for replacing a low-voltage control part of a vacuum insulated switchgear,

the vacuum insulated switchgear is provided with a switch unit for receiving a switch for switching on and off a current and an operator for operating the switch, a cable connection unit for receiving a cable for supplying power to a load side, and a low voltage control unit for receiving a protective relay, and the switch unit, the cable connection unit, and the low voltage control unit are assembled in an independent box shape,

the switch in the switch part is operated to the cut-off position,

after the connector between the low voltage control part and the switch part is detached,

the modularized low voltage control unit is replaced by a repaired or new one,

the switch unit is disposed on the lower side of the front surface of the vacuum insulated switchgear, the cable connection unit is disposed on the rear surface side of the vacuum insulated switchgear in a state where a part thereof is mounted on the switch unit via a spacer, the low voltage control unit is disposed on the upper side of the front surface of the vacuum insulated switchgear in a state where a part thereof is mounted on the spacer, and the part of the low voltage control unit is mounted on the switch unit, thereby increasing the strength of the switch unit so that the strength thereof is higher than that of either the low voltage control unit or the cable connection unit.

12. A method for replacing a cable connection part of vacuum insulated switchgear,

the vacuum insulated switchgear is provided with a switch unit for receiving a switch for switching on and off a current and an operator for operating the switch, a cable connection unit for receiving a cable for supplying power to a load side, and a low voltage control unit, and the switch unit, the cable connection unit, and the low voltage control unit are assembled in an independent box shape,

the switch in the switch part is operated to the cut-off position,

after the cable in the cable connecting part is detached,

the modularized cable connection part is replaced by a repaired or new product,

the switch unit is disposed on the lower side of the front surface of the vacuum insulated switchgear, the cable connection unit is disposed on the rear surface side of the vacuum insulated switchgear in a state where a part thereof is mounted on the switch unit via a spacer, the low voltage control unit is disposed on the upper side of the front surface of the vacuum insulated switchgear in a state where a part thereof is mounted on the spacer, and the part of the low voltage control unit is mounted on the switch unit, thereby increasing the strength of the switch unit so that the strength thereof is higher than that of either the low voltage control unit or the cable connection unit.

13. A method for adjusting the bus connecting position of vacuum insulated switchgear,

a method for adjusting a bus connection position of a vacuum insulated switchgear comprising a switch unit for receiving a switch for turning on and off a current and an operating device for operating the switch, a cable connection unit for receiving a cable for supplying power to a load side, and a low-voltage control unit, and combining these units,

the switch unit, the cable connection unit and the low voltage control unit are all assembled into an independent box,

the switch part, the cable connection part and the low voltage control part which are assembled are connected after the bus connection position is adjusted by lifting the base arranged at the bottom of the switch part,

the switch unit is disposed on the lower side of the front surface of the vacuum insulated switchgear, the cable connection unit is disposed on the rear surface side of the vacuum insulated switchgear in a state where a part thereof is mounted on the switch unit via a spacer, the low voltage control unit is disposed on the upper side of the front surface of the vacuum insulated switchgear in a state where a part thereof is mounted on the spacer, and the part of the low voltage control unit is mounted on the switch unit, thereby increasing the strength of the switch unit so that the strength thereof is higher than that of either the low voltage control unit or the cable connection unit.

14. A method for adjusting the bus connecting position of vacuum insulated switchgear,

the bus connection position adjusting method for a vacuum insulated switchgear is a method for adjusting the bus connection position of a vacuum insulated switchgear, which is provided with a switch unit for receiving a switch for switching on and off a current and an operator for operating the switch, a cable connection unit for receiving a cable for supplying power to a load side, and a low voltage control unit, and combines these units, and which is capable of contacting a bus of the vacuum insulated switchgear from the outside of the vacuum insulated switchgear by opening and closing a door provided in the low voltage control unit,

the switch unit, the cable connection unit and the low voltage control unit are all assembled into an independent box,

after the modular switch unit, the cable connection unit and the low voltage control unit are connected, a base provided at the bottom of the switch unit is lifted to adjust a bus connection position,

the switch unit is disposed on the lower side of the front surface of the vacuum insulated switchgear, the cable connection unit is disposed on the rear surface side of the vacuum insulated switchgear in a state where a part thereof is mounted on the switch unit via a spacer, the low voltage control unit is disposed on the upper side of the front surface of the vacuum insulated switchgear in a state where a part thereof is mounted on the spacer, and the part of the low voltage control unit is mounted on the switch unit, thereby increasing the strength of the switch unit so that the strength thereof is higher than that of either the low voltage control unit or the cable connection unit.