JP4090095B2 - Multi-circuit switch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ground-mounted multi-circuit switch, and more particularly to a multi-circuit switch in which a plurality of switch units (unit-type switches) are provided in a sealed case and further housed in a cabinet.
[0002]
[Prior art]
Conventionally, as this type of multi-circuit switch, as shown in FIG. 15, for example, when four circuits are configured, four switches 102, 103, 104, and 105 are provided in a sealed case 101 in the cabinet 100. The current input from the load side cable 106 is divided into the conductive bus bar 107 -the load side terminal 108 -the main circuit switch 102 -the power source side terminal 109 -the conductive bus bar 110 -the power source side terminals 111, 112, and 113-3 pieces. Branch circuit switches 103, 104, 105 -load side terminals 114, 115, 116 -conductive bus bars 117, 118, 119 -conduct current to each consumer through load side cables 120, 121, 122.
[0003]
In this case, since each conductive bus bar 107, 110, 117 to 119 is formed with the same cross-sectional area and the same surface area, a 400 A rated switch is used as the branch circuit switch 103, 104, 105. When used, the main circuit switch 102 is a 600 A rated switch.
In addition, in FIG. 15, it has U phase, V phase, and W phase in the front and back direction of the paper surface, but FIG. 9 shows only one phase.
[0004]
[Problems to be solved by the invention]
By the way, in the above, when configuring a four-circuit multi-circuit switch, it is necessary to prepare two different types of switches: a 600A rated switch and a 400A rated switch. Therefore, there is a problem in that each of the design costs is high, and the size (dimension) and weight of each switch is different, so that it is difficult to assemble and store the switch in the case. Also, in terms of manufacturing, in order to cope with short delivery times, models with different ratings had to be prepared in advance, which was also disadvantageous in terms of inventory management. From the viewpoint of inventory management, if four 600A rated switches are used in the above, there is no need to prepare different models in advance. , Increase in cost, increase in size, increase in weight, etc., and do not solve the fundamental problem.
[0005]
[Means for Solving the Problems]
The present invention proposes a configuration for using switches of the same current rating and branch circuit switches in order to solve the above various problems in the main circuit switches, the first invention, the same current A plurality of rated unit type switches are housed in a sealed case, and the power supply side terminals of these unit type switches are connected to each other by conductive bus bars, and the load side terminals and cables connected to the load side terminals It is those which so as to constitute a multi-circuit connected by the conductive bus bars between, the conductive bus bar to be drawn from the conductive bus bar and the main circuit switches being introduced into the main circuit switch each of the cross-sectional area and surface area, and the size comb than the cross-sectional area and surface area of the load side of the conductive bus bar in the branch circuit switch, formed to enhance the heat dissipation effect to increase the duty ratio (current carrying capacity), Among the serial unit type switch, it is to propose a multi-circuit switch, characterized in that using the main circuit switch as more switches rated [0006]
According to a second aspect of the present invention, a plurality of unit type switches having the same current rating are housed in a sealed case, and a conductive bus bar for the branch circuit switch is connected to a power supply side terminal of the branch circuit switch of these switches. Connect the conductive bus bar for the main circuit switch connected to the power supply side terminal of the main circuit switch to the conductive bus bar for each branch circuit switch and use it as the input terminal for the main circuit switch the load side terminal of the load-side terminal and the branching circuit switch to be one which is adapted to constitute a multi-circuit by connecting the respective conductive bus bar, electrically conductive connected to the load side terminal of the main circuit switch bus bars and the cross-sectional area and surface area of each of the main circuit switch of the power source side conductive connected to the terminal bus bar, than the cross-sectional area and surface area in the conductive bus bar of the power supply side and load side of the branch circuit switch dexterity Multi which comb can form so as to enhance the heat dissipation effect to increase the duty ratio (current carrying capacity) of the unit-type switch, and wherein the using the main circuit switch as more switches rated A circuit switch is proposed.
[0007]
The third aspect of the invention related to the first or second aspect of the invention, the main circuit switch side of the conductive bus bar is, a plurality of conductive plates, juxtaposed a space is provided between the plurality of conductive plates The present invention proposes a multi-circuit switch characterized by being formed as described above.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. The drawing shows a high-voltage multi-circuit switch 10 of the present invention consisting of four circuits of one 600A (ampere) rating and three 400A ratings. As shown in FIGS. 1 to 5, the overall shape is a unit type. 4 of the main circuit switch 1 and the unit type branch circuit switches 2, 3 and 4 of the sealed case 9 through the mounting base brackets 5, 6, 7 and 8 attached to one end of the side surface. Each of the switches is attached to the front inner surface 9a by attaching screws 27 in the side-by-side state while appropriately securing an insulation distance between the switches. The unit type switches used for this are of the same rating, and in this embodiment, those of 400 A (ampere) rating are used, of which the rightmost main circuit in FIGS. The switch 1 has a 400A rating used as a 600A rating.
[0009]
Details of the unit type switch will be described with reference to FIGS.
11 includes two divided arc-shaped insulating members that are screwed together to form a cylindrical shape, and the internal space of the power-side arc-extinguishing chamber 14 and the load-side arc-extinguishing chamber 15 is divided by insulating partition plates 12 and 13. It is an insulating cylinder divided into two arc extinguishing chambers and is made of a transparent synthetic resin. Reference numeral 16 denotes a power supply side terminal fixed on one side peripheral surface of the insulating cylinder 11 via the insulating protrusion 17, and 18 denotes the other end of the insulating cylinder facing the power supply side terminal 16 via the insulating protrusion 19. It is a fixed load side terminal. A clip-shaped fixed contact portion 18 a is provided on the inner end side of the load side terminal 18. Further, a fixed contact portion 16 a similar to the contact portion of the load side terminal is also provided on the inner end side of the power supply side terminal 16. Reference numeral 20 denotes a blade-shaped movable electrode that is rotated by an operation handle (not shown) so as to open and close the electric circuit. The electrode 20 is fixed to an insulating cylindrical rotating shaft 21 that is connected to the handle. The contact parts 20a and 20b are inserted into contact with or separated from the fixed contact parts 16a and 18a by rotation so that the electric circuit of the switch is opened and closed.
[0010]
That is, the electric circuit is opened and closed as follows.
In the closed state of FIG. 6, when the movable electrode 20 is rotated approximately 90 degrees counterclockwise by an operation handle (not shown), the contact portions 20a and 20b of the movable electrode 20 are contact portions 16a of terminals also serving as fixed electrodes. , 18a away from each other, an arc a is generated between the contact portions as shown in FIG. Accordingly, SF 6 gas g of arc extinguishing gas filling the arc extinguishing chamber 14 on the power source side and the arc extinguishing chamber 15 on the load side of the insulating cylinder 11 rotates in unison with the rotating shaft 21. Compressed by the plate 22, the compressed gas is further guided by the nozzles 23 and 24, moved in the clockwise direction, blown toward the arc, extinguishing the arc, and the circuit is opened as shown in FIG.
[0011]
Further, in the open state of FIG. 8, when the movable electrode 20 is rotated 90 degrees in the opposite clockwise direction by the operation handle, the contact portions 20a and 20b of the movable electrode 20 are inserted into the fixed contact portions 16a and 18a, respectively. It contacts and it will be in the closed state of FIG. At this time, since the compression plate 22 simultaneously rotates in the reverse direction, the SF6 gas discharged into the case is led again into the arc extinguishing chambers 14 and 15 to prepare for the next opening operation.
[0012]
Next, the connection situation using a conductive bus bar will be described.
Reference numeral 26 denotes a power supply side conductive bus bar that bridge-connects between the main circuit switch 1 and the power supply side terminals 16, 28, 29, 30 of the branch circuit switches 2, 3, 4. In the embodiment of FIG. 3, the terminals 16, 28, 29, and 30 of the switch are centered, and two copper plates are attached in parallel as a pair on the front and back thereof. Thus, a parallel space s is formed between the conductive bus bars 24a and 24b, 25a and 25b, and 26a and 26b in order to promote a heat dissipation effect. 1 to 3 show three phases of U, V, and W. As described above, a total of six copper conductive bus bars 24a, 24b, 25a, two for each phase, as described above. 25b, 26a, and 26b.
[0013]
35 (35u, 35v, 35w), 36 (36u, 36v, 36w), 37 (37u, 37v, 37w), 38 (38u, 38v, 38w) are load side terminals 18 (18u, 18v, 18w), 32 (32u, 32v, 32w), 33 (33u, 33v, 33w), 34 (34u, 34v, 34w) conductive busbars, among them the load side of the main circuit switch 1 with 600A rating in particular For the conductive bus bars 35u, 35v, 35w connected to the terminals 18 (18u, 18v, 18w), a plurality of, for example, two copper plates, for example, two copper plates having a wide thickness are used (see FIG. 1). The cross-sectional area and surface area are made larger than the conductive bus bars 36, 37, and 38 of the branch circuit switches 2, 3, and 4 to increase the current carrying capacity and at the same time increase the heat radiation area. Has a structure in which to promote the aggressive heat dissipation. The conductive bus bars 36, 37, and 38 are also effective when the two copper plates are formed side by side with a space between them in the same manner as the conductive bus bar 26. is there.
[0014]
FIG. 5 is a single-line circuit showing only the U phase in the multi-circuit switch 10. The 400 A rated main circuit switch 1 used as the 600 A rating this time is a conductive bus bar 24a connected to the terminal 16u on the power supply side. And 24b are indicated by double lines, conductive bus bars 35u connected to the load side terminal 18u are indicated by thick lines, and the load side terminals of the 400A rated branch circuit switches 2, 3 and 4 provided therewith The conductive bus bars 36u, 37u, and 38u connected to 32u, 33u, and 34u are indicated by thin lines because their current carrying capacities are smaller than that. The conductive bus bars connected to the power supply terminals 28u, 29u and 30u of the 400A rated switches 2, 3, and 4 are the 600A rated conductive bus bars 24a and 24b, 25a and 25b, and 26a and 26b. Is done. That is, the power supply side terminals 16u, 28u, 29u, and 30u are branched and connected to the conductive bus bars 24a and 24b, 25a and 25b, and 26a and 26b that connect these terminals in a bridging manner.
[0015]
40 (40u, 40v, 40w), 41 (41u, 41v, 41w), 42 (42u, 42v, 42w), 43 (43u, 41v, 41w) are load side cables, and these cables are the load side in the case. Load-side bushing 44 of each switch connected to the conductive bus bar 35 (35u, 35v, 35w), 36 (36u, 36v, 36w), 37 (37u, 37v, 37w), 38 (38u, 38v, 38w) (44u, 44v, 44w), 45 (45u, 45v, 45w), 46 (46u, 46v, 46w), 47 (47u, 47v, 47w) are detachable. Of these load side cables, in particular, the rightmost cable 40 (40u, 40v, 40w) in FIG. 2 is used in connection with the main line as an input cable for the 600A rated switch 1, The other cables are connected to the high-voltage customers as load side cables 41 (41u, 41v, 41w), 42 (42u, 42v, 42w), 43 (43u, 43v, 43w) of the 400A rated switches 2, 3, 4 Used in connection.
50 is a cabinet body, 51a is a ventilation port provided on both sides and back of the cabinet 50, 9d is a pressure relief port provided on the bottom surface 9c of the case, 51 is a door located on the front side of the cabinet body 50, and 52 is a gas leak A lever of the locking device, 53 is a handle shaft connected to the rotary shaft 21 of the switch in the case 9, 54 is a case leg, and 55 is an installation angle.
[0016]
The current in the multi-circuit switch 10 of the present application having the above configuration, 6 00A of 400A rating to be used as rating of the main circuit switch 1 load side cable 40 (40u, 40v, 40w) - conductive bus bar 35 (35u , 35v, 35W)-load side terminal 18 (18u, 18v, 18w) of main circuit switch 1-main circuit switch 1-power source side terminal 16 (16u, 16v, 16w)-conductive bus bars 24a, 24b, 25a And 25b, 26a and 26b-400A branch circuit switches 2, 3, 4 power supply side terminals 28 (28u, 28v, 28w), 29 (29u, 29v, 29w), 30 (30u, 30v, 30w) -branch Circuit switches 2, 3, 4-load side terminals 32, 33, 34 (each u, v, w)-conductive bus bars 36, 37, 38 (each u, v, w)-load side cable 41 (4 1u, 41v, 41w), 42 (42u, 42v, 42w), 43 (43u, 43v, 43w)-energized by the route of each customer. In such a case, the main circuit switch 1 used as the 600 A rating has a rated current of 400 A originally designed, so that a current exceeding that is energized. However, as described above, Both terminals on the load side increase the current carrying capacity, increase the heat radiation area, secure the heat radiation space, etc. to enhance the heat radiation effect and suppress the heat generation (temperature rise) of the main circuit switch 1 itself, Since the conductive bus bars 35u, 35v, and 35w that suppress heat transfer to the branch circuit switches 2, 3, and 4 are connected, not only the main circuit switch 1 but also the branch circuit switches 2, 3, and 4 are heated. No adverse effects from heat transfer, etc.
[0017]
FIG. 9 shows a second embodiment of the present invention.
In the second embodiment, the power supply side terminal 16u of the main circuit switch 1 and the power supply side terminals 28u, 29u, 30u of the branch circuit switches 2, 3 and 4 in the above embodiment are connected to two power supply side conductivity. This is an example in which the present invention is applied to a multi-circuit switch connected to the bus bars 24a, 24b by conductive bus bars 60u, 61u, 62u, 63u, respectively.
[0018]
In the present embodiment, the power supply side conductive bus bars 61u, 62u, 63u in the branch circuit switches 2, 3, 4 are replaced with the load side conductive bus bars 36u, 37u, 38u in the branch circuit switches 2, 3, 4 respectively. The conductive bus bars 35u, 24, 60u on the main circuit switch 1 side are disconnected from the conductive bus bars 61u, 62u, 63u, 36u, 37u, 38u. The area is large and the surface area is large.
[0019]
Since the other configuration is the same as that of the embodiment shown in FIG. 5, the same parts are denoted by the same reference numerals and the description thereof is omitted.
[0020]
FIG. 10 shows a third embodiment of the present invention.
The third embodiment is an example in which the main circuit switch is used as two units 1 and 4. In this embodiment, the conductive bus bars 60u, 35u, 63u, and 38u on the power source side terminals 16u and 30u side and the load side terminals 18u and 34u side of the main circuit switches 1 and 4 are connected to the power sources of the branch path switches 2 and 3, respectively. The cross-sectional area is larger than the conductive bus bars 61u, 62u, 36u, 37u on the side terminals 28u, 29u side and the load side terminals 32u, 33u side, and the surface area is also increased. The conductive bus bars 60a, 61u, 62u, 63u on the power supply side terminals of the main circuit switches 1, 4 and the branch path switches 2, 3 are electrically conductive bus bars 24a, 24b made of two plates in the same manner as described above. Connect using.
Further, the cables 40u and 43u on the load side terminals of the main circuit switches 1 and 4 are similar to the above and have a large cross-sectional area and a large surface area.
[0021]
FIG. 11 shows a fourth embodiment of the present invention.
The fourth embodiment is an example in which the main circuit switch is used as two units 1 and 4. In the present embodiment, the conductive bus bars 35u and 38u on the load side terminals 18u and 34u side of the main circuit switches 1 and 4 are replaced with the conductive bus bars 36u and 37u on the load side terminal sides 32u and 33u of the branch path switches 2 and 3, respectively. The cross-sectional area is larger and the surface area is larger. On the power supply side terminal side, conductive bus bars 24a and 24b made of two plates are used as described above. Further, the cables 40u and 43u on the load side terminals of the main circuit switches 1 and 4 are also used in the same manner as described above, having a large cross-sectional area and a large surface area.
[0022]
FIG. 12 shows a fifth embodiment of the present invention.
The fifth embodiment is an example in which the main circuit switch is used as two units 1 and 4. In this embodiment, the conductive bus bars 60u, 63u on the power supply side terminals 16u, 30u side and the conductive bus bars 35u, 38u on the load side terminals 18u, 34u of the main circuit switches 1, 4 are connected to the branch path switches 2, 3 respectively. The cross-sectional area is larger and the surface area is larger than the conductive bus bars 61u, 62u, 36u, 37u on the power supply side terminal side and the load side terminal side. Further, the two conductive bus bars 24a and 24b as described above are not used as the conductive bus bar on the power supply side terminal side, but instead, one conductive bus bar is formed by bending the conductive bus bar on the power supply side terminal side into a U-shape. The sex bus bar 24A is used.
[0023]
FIG. 13 shows a sixth embodiment of the present invention.
The sixth embodiment is an example in which the main circuit switch is used as one of the leftmost reference numeral 1 in the drawing. In this embodiment, the conductive bus bar 60u on the power supply side terminal 16u side of the main circuit switch 1 and the conductive bus bars 61u, 62u, 63u on the load side terminals 28u, 29u, 30u side of the branch circuit switches 2, 3, 4 are used. The cross-sectional area of the conductive bus bar 24B connected to the conductive bus bar 35u and the conductive bus bar 35u on the load side terminal side of the main circuit switch 1 are increased, and the surface area is also increased. The conductive bus bar 24B does not use two conductive bus bars, but uses one conductive bus bar 24B.
[0024]
FIG. 14 shows a seventh embodiment of the present invention.
In the seventh embodiment, the two conductive bus bars 24a and 24b on the power supply side terminal side in the first embodiment shown in FIG. 5 are replaced with a single conductive bus bar 24C having a large cross-sectional area and a large surface area. It is.
[0025]
In the second to seventh embodiments, the same effects as in the first embodiment are exhibited. 9 to 14 show only the U phase similarly to FIG. 5 described above, but have the U phase, the V phase, and the W phase in the front and back direction of the paper surface.
[0026]
【The invention's effect】
As described above, according to the first and second aspects of the present invention, the heat generated when the switch is energized is connected to the power supply side and the load side terminal of the main circuit switch and has good heat dissipation characteristics. As a result of actively dissipating heat with the bus bar and suppressing the temperature rise of the main circuit switch as well as the heat transfer to the branch circuit switch provided as a result, the main circuit switch is used as a switch exceeding the rating Even in this case, it is possible to use a main circuit switch that has the same current rating as the branch circuit switch that is attached to the switch. Multi-circuit switches with different rated currents can be manufactured relatively easily, so it is possible to cope with short delivery times, and it is advantageous for inventory management, and it is effective for cost reduction. Is.
[0027]
According to invention of Claim 3, the thermal radiation efficiency of the conductive bus bar in the main circuit switch side improves further, and said effect can be improved further.
[Brief description of the drawings]
FIG. 1 is a bottom view of a multi-circuit switch cabinet according to the present invention in a state where a cabinet and a bottom side of a case are removed.
FIG. 2 is a rear view of the multi-circuit switch of the present invention with the cabinet and case back side removed.
FIG. 3 is a plan view of the multi-circuit switch of the present invention in a state where the cabinet and the upper surface side of the case are removed.
FIG. 4 is a side view of the multi-circuit switch of the present invention with the cabinet and case side surfaces removed.
FIG. 5 is a single-line circuit diagram of a multi-circuit switch according to the present invention.
FIG. 6 is an enlarged sectional view of the switch according to the present invention, showing a closed state.
FIG. 7 is an enlarged cross-sectional view of the switch of the present invention, showing a state in the middle of closing.
FIG. 8 is a cross-sectional view of the switch of the present invention, showing an open circuit state. FIG. 9 is a single-line circuit diagram of a multi-circuit switch showing a second embodiment of the present invention.
FIG. 10 is a single-line circuit diagram of a multi-circuit switch showing a third embodiment of the present invention.
FIG. 11 is a single-line circuit diagram of a multi-circuit switch showing a fourth embodiment of the present invention.
FIG. 12 is a single-line circuit diagram of a multi-circuit switch showing a fifth embodiment of the present invention.
FIG. 13 is a single-line circuit diagram of a multi-circuit switch showing a sixth embodiment of the present invention.
FIG. 14 is a single-line circuit diagram of a multi-circuit switch showing a seventh embodiment of the present invention.
FIG. 15 is a single-line circuit diagram of a conventional multi-circuit switch.
[Explanation of symbols]
1 Unit type 600A rated main circuit switch 2, 3, 4 Unit type 400A rated branch circuit switch 9 Case 10 Multi-circuit switch 24 u phase power supply side conductive bus bar 25 v phase power supply side conductive bus bar 26 w phase Power source side conductive bus bar 35 Load side conductive bus bar 36 Load side conductive bus bar 37 Load side conductive bus bar 38 Load side conductive bus bar S Space 60 to 62 Power source side conductive bus bar of branch circuit switch

Claims (3)

Multiple unit type switches with the same current rating are housed in a sealed case, and the power supply side terminals of these unit type switches are connected to each other with conductive bus bars and connected to the load side terminals and the load side terminals. to be one which is adapted to constitute a multi-circuit connected by the conductive bus bars between the cables, the conductive bus bar to be drawn from the conductive introduced into the main circuit switch bus bar and said main circuit switch the cross-sectional area and surface area of each and magnitude comb than the cross-sectional area and surface area of the load side of the conductive bus bar in the branch circuit switch, formed to enhance the heat dissipation effect to increase the duty ratio (current carrying capacity), the unit type Among the switches, a multi-circuit switch characterized in that the main circuit switch is used as a switch exceeding the rating . A plurality of unit type switches with the same current rating are housed in a sealed case, and the conductive bus bar for the branch circuit switch is connected to the power supply side terminal of the branch circuit switch of these switches. The conductive bus bar for the main circuit switch connected to the power supply side terminal of the switch is connected to the conductive bus bar for each branch circuit switch, and the load side terminal used as the input terminal of the main circuit switch and the above It is one which is adapted to the load terminal of the branch circuit switch connected respectively conductive bus bars constituting a multi-circuit, the conductive connected to the load side terminal of the main circuit switch bus bar and said main circuit switch vessels of the cross-sectional area and surface area of each of the conductive bus bar connected to the power source side terminal, and the size comb than the cross-sectional area and surface area in the power supply side and load side of the conductive bus bar of the branch circuit switch dexterity, through Rate to increase the (current carrying capacity) formed to enhance the heat dissipation effect, among the unit type switch, multicircuit switch, characterized in that using the main circuit switch as more switches rated. The main circuit switch side of the conductive bus bar is, a plurality of conductive plates, multi-circuit switch according to claim 1 or 2, wherein is formed by juxtaposed a space is provided between the plurality of conductive plates.

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