JPH022005Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a branch switchgear used in high voltage cabinets, distribution towers, etc.

Conventional branch switches in high-voltage cabinets are
As shown in Figure 1A and B, several sets of three-phase disconnect switches are arranged horizontally in a row, and each cable introduced from underground into the high-voltage cabinet is connected to each disconnect switch. The in-phase connections were connected by busbani projecting from the top of each disconnector. However, this required a disconnector to be operated for each phase, and it was not possible to disconnect all three phases at the same time. Further, as mentioned above, since a busbar is provided at each disconnector, the height of the high-pressure cabinet is increased even though the disconnection operation is performed in the horizontal direction. In addition, as shown in Figure 2 A, B, and C, there are multi-circuit switches that open and close three phases simultaneously in the vertical direction, but since the switches between the multi-circuits are interconnected with busbars, each phase Since the three-phase switches are arranged horizontally in three rows from the front to the rear of the high-voltage cabinet, it has the disadvantage of being large in depth. Furthermore, when connecting the cable to the switch RO' at the rear of the high-voltage cabinet, the switch RO' at the front gets in the way, making the work difficult. Due to recent road traffic conditions, high-voltage cabinets and distribution towers installed on roads are required to be thin in depth.
There are devices that open and close the operating mechanism by attaching it to a switch, but this has the disadvantage that it becomes complicated to attach and remove the operating mechanism in places where opening and closing are frequent.

This idea was devised in view of these points. A switching operation mechanism that opens and closes three-phase switches simultaneously vertically is provided in advance on the top of the switch, and the same-phase switches between several circuits can be connected to each other. Several sets of three-phase switchgears are lined up horizontally in a row by connecting them with high-voltage molded busbars to reduce the depth and minimize the space needed for switchgears and distribution towers, and the cable head is connected in front of each switch. The present invention also provides a switchgear for branching distribution towers, which is arranged so as to connect the high-voltage molded bus bar at the rear, thereby making it extremely easy to connect the cable to the switch.

An embodiment of this invention will be described below with reference to the drawings. First, Figures 3 and 4 show the inside of the high-voltage cabinet, where 1 is the high-voltage cabinet, 2 is the front panel of the high-voltage cabinet 1, and 3 is the high-voltage cabinet 1.
4 is a switch for each of the three phases fixed horizontally in a line on the support shelf 3; 5 is a cable for each of the three phases that passes through the bottom plate 6 of the cabinet 1; Cable heads are provided at the upper ends of each of these cables 5, and the cable heads 7 are fixed to the front of the lower part of the switch 4, respectively. Reference numeral 8 denotes a molded busbar in which each of the three phases is bundled and supported by a binder 9 fixed inside the high-voltage cabinet 1, and each branch part 10 is fixed to the rear of the lower part of each switch 4, and 11 is the above-mentioned A bracket 12 supporting the cable 5 is an opening/closing mechanism of the switch 4 provided in the high voltage cabinet 1. Next, the fifth
6, 7, and 8 show each part of the switch 4 to switch 4, and 13 is a pair of vertical cylindrical fixed electrode tubes containing fixed electrodes. 13 penetrates the support shelf 3 and its own tsuba 1
3a are placed on a support shelf 3, and these collars 13a are held down by fixtures 14. 15 is a bolt nut for holding this fixture 13 to the support shelf 3;
Reference numeral 6 denotes a waterproof and dustproof gasket provided on the outer periphery of the fixed electrode cylinder 13 on this fixture 14, 17 a support ring screwed onto the inner circumferential threaded portion of the hollow lower part of each of the fixed electrode cylinders 13, and 18 the same for each of the fixed electrode cylinders 13. A large number of strips 18a inserted into the hollow part of the fixed electrode cylinder 13 are inserted into the cylinder body 18b.
Fixed electrode 19 supported on the outer periphery and formed by winding annular springs 18c around the outer periphery of both sides of the strip 18a.
is an annular arc-resistant metal screwed onto the inner circumferential threaded portion of the hollow upper portion of each fixed electrode tube 13, and the vertical movement of the fixed electrode 18 is restricted by this arc-resistant metal 19 and the support ring 17. 20 is this arc-resistant metal 19
A cylindrical arc extinguishing chamber inserted into the hollow upper part of each upper fixed electrode cylinder 13, 21 is a support ring screwed onto the inner peripheral screw part above the arc extinguishing chamber 20, and this support ring 21 and arc resistant The vertical movement of the arc extinguishing chamber 20 is restricted by the metal 19. Reference numeral 22 denotes an arc extinguishing rod whose one end is pivotally supported on a shaft 18d extending between both side walls of the cylindrical body 18b of the fixed electrode 18, and whose other end is loosely penetrated into the arc extinguishing chamber 20. Reference numeral 23 denotes a pair of fixed electrodes. A movable lid that can be freely covered with the tube 13, 24 are cylindrical legs on both sides of the movable lid 23, 28 are cylindrical movable electrodes that hang down in the hollow part of the cylindrical legs 24, and the movable lid 23 is fixed to a pair of When the movable electrode 25 is placed on the electrode cylinder 13, it enters the gap between the inner periphery of the arc extinguishing chamber 20 of each fixed electrode cylinder 13 and the outer periphery of the arc extinguishing rod 22, and the arc extinguishing rod 22 is inserted into the hollow inside of the movable electrode 25. When inserted, the outer periphery of the tip of the movable electrode 25 comes into contact with the inner periphery of the upper part of the fixed electrode 18. 2
Reference numeral 6 denotes a conductor buried within this movable lid 23, and the movable electrodes 25 on both sides are electrically connected by this conductor 26. 27 is a buffer gasket provided in the hollow inner part of the cylindrical leg 24; 28 is a terminal that grips and compresses the core wire of the cable 5; 29 is a round bar-shaped conductor provided at the upper end of this terminal 28; inserted into the lower part of the fixed electrode 18 of each fixed electrode cylinder 13,
The support ring 17 has its own flange 30 in contact with its lower end surface. Reference numeral 31 denotes a fixing ring that is placed around the outer periphery of the terminal 28, and this fixing ring 31 is attached to the fixed electrode tube 1.
3, the collar 30 of the conductor 29 is supported between the support ring 17 and the fixing ring 31. 32 is a stress cone crowned on the outer periphery of the cable 5 below the terminal 28;
Reference numeral 3 designates a cap made of insulating rubber that extends upward from the outer periphery of the stress cone 32 in a flap shape, with the conductor 29 and the terminal 28 positioned in the center of its hollow part. The lower portion of the fixed electrode tube 13 can be freely covered. 34 is a conductive rubber layer provided above and below the outer periphery of the cap 33; 35 is a conductive rubber layer provided on the inner periphery of the cap 33;
is located at the lower outer periphery of the fixed ring 31 when the cap 33 is mounted on each fixed electrode cylinder 13,
This is to stop the coronavirus. Reference numeral 36 denotes a voltage detection unit cover made of conductive rubber provided on the outer periphery between the upper and lower conductive rubber layers 34, and 37 represents this voltage detection unit cover 36.
A voltage detecting unit band is wrapped around the outer periphery, 38 is a cover embossment having a partially cut-out circle in cross section, which is covered with the outer periphery of the upper and lower conductive rubber layers 34, and 39 is a hose band wrapped around the outer periphery of these cover embossers 38. be. Next, FIG. 9, FIG. 10, and FIG. 11 show the mold busbar 8 which bundles three phases, and 40 is the horizontal rod part of each mold busbar 8, and the key is inserted from both ends and approximately the center of these horizontal rod parts 40. The branch portion 10 stands vertically or vertically. Each mold bus bar 8 has a key-shaped branch part 10.
Two mold busbars 8 having the following shapes are arranged so that the branch part 10 faces inward, a mold busbar 8 with a vertical branch part 10 is inserted between them, and these three mold busbars 8 are sequentially moved laterally. The nine branch parts 10 are arranged so that they are aligned in a straight line, and the mold generatrixes 8 are bundled and fixed using the binding tool 9. 41 is a copper band built in along the horizontal rod portion 40, 42 is a branch conductor built in the branch portion 10, connected to the copper band 41 at 10 locations of each branch portion by caulking or soldering, and 43 is a branch conductor built in the branch portion 10; These copper strips 41
and a molded insulating rubber layer covering the entire outer surface of the branch conductor 42; 44 is the branch conductor 4 of the branch portion 40;
2. A bowl-shaped part that opens out from the outer periphery of the upper end,
This bowl-shaped portion 44 is made of an insulating rubber layer that is integrated with the above-mentioned insulating rubber layer 43. 45 is a semi-conductive rubber layer molded on the entire outer periphery of these insulating rubber layers 43; 46 is a cover press with a partially cut-out circular cross section wrapped around the outer periphery of the semi-conductive rubber layer 45; 47 is this cover press 46 Hose band wrapped around the outside,
48 is a hollow part formed in the bowl-shaped part 44; 49 is a branch electrode whose lower end is connected to the upper end of each branch conductor 42 by screwing and stands upright in the center of the hollow part 48; When the bowl-shaped part 44 of each branch part 10 is placed on the lower part of the electrode tube 13,
It is inserted into and comes into contact with the lower part of the fixed electrode 18.

This device has the above structure, and the switch 4 opens and closes in the vertical direction. When the movable lid 23 of the switch 4 is pulled upward by the operation of the opening/closing mechanism section 12, the movable electrode 25 becomes the fixed electrode. 18, the electrical connection from the cable 5 to the molded bus bar 8 is broken and the circuit is opened. Further, as shown in FIG. 5, when the movable lid 23 is placed on the fixed electrode cylinder 13, the movable electrode 25 comes into contact with the fixed electrode 18, and is electrically connected from the cable 5 to the mold bus bar 8, thereby closing the circuit. In addition, in this invention, a pair of fixed electrode tubes 13 of the switch 4
A cable head 7 is provided at the front lower part of the mold bus bar 8, and a branch part 10 of the mold bus bar 8 is provided at the lower part of the fixed electrode tube 13 at the rear. Since it is used as a ground layer, the three-phase molded busbars 8 can be bundled together, and furthermore, the branch parts 10 of each molded busbar 8 can be arranged in a straight line, and nine switches 4 can be arranged in a horizontal row. A molded busbar 8 that interconnects the switches 4 of each phase is arranged at the rear lower part of each switch 4. Therefore, compared to a conventional multi-circuit switch that opens and closes in the vertical direction, in which three-phase switches are arranged in three rows by connecting the switches of the same phase of each multi-circuit with a bus bar, the high-voltage cabinet is 1/3 the size. Despite having the opening/closing mechanism at the top of the switch 4, the molded bus bar 8 is placed at the bottom of the switch 4, making the size of the high-voltage cabinet 1 extremely compact. . Furthermore, when removing the cable head 7 from the lower part of the switch 4 shown in FIG. When the fixed ring 31 is removed from the fixed electrode cylinder 13, the fixed electrode 18
The conductor 29 comes off, and the conductor 29 and the terminal 28 come off from the fixed electrode tube 13. In this way, the cable head 7 of this invention can be easily removed from the lower part of the fixed electrode tube 13. Moreover, in this invention, each cable head 7 is connected to a fixed electrode tube 1 located in front of each switch 4.
3, the cable head 7 can be connected to and removed from the fixed electrode tube 13 from the front inside the high-voltage cabinet 1, making it extremely easy.

Although this invention was used in the high voltage cabinet 1 in the above embodiment, it is applicable not only to high voltage cabinets but also to all distribution towers such as distribution towers.

As described above, in this invention, several sets of switches 4 each consisting of a three-phase set are arranged horizontally in a line in a distribution tower, and the switches 4 of the same phase between each set are connected to the rear lower part of each switch 4. By connecting the cable head 7 of the cable 5 to the front lower part of the switch 4, the distribution towers can be made smaller and take up less space. This has the effect that the cable head 7 can be connected at the front of the distribution tower, making the work easier.

[Brief explanation of drawings]

The drawings show one embodiment of this invention. Figs. 1A and B are a front view and a partially cutaway side view of a conventional example, and Figs. 2A, B, and C are a front view and a partially cutaway side view of another conventional example, respectively. Fig. 3 is a partially cutaway front view of this invention, Fig. 4 is a side sectional view of the same, Fig. 5 is a partially sectional side view of the switch of this invention, and Fig. 6 is a partially cutaway side view of the switch of this invention. FIG. 7 is a partially sectional side view of the movable lid of this invention; FIG. 7 is a partially sectional side view of a pair of fixed electrode tubes of this invention; FIG. 8 is a partially sectional side view of the cable head of this invention; FIG. 9 10 is a front view showing a bundled state of the mold bus bars of this invention, and FIG. 11 is a plan view of the same. In the figure, 1 is a high-pressure cabinet, 3 is a support shelf,
4 is a switch, 5 is a cable, 7 is a cable head, 8 is a mold bus bar, 10 is a branch part, 13 is a fixed electrode tube, 18 is a fixed electrode, 23 is a movable lid, 25
is a movable electrode.

Claims (1)

[Scope of utility model registration request] Several sets of three-phase switches are arranged horizontally in a line inside the distribution towers, and each switch has two vertical fixed electrode tubes of the same shape and size, each containing a fixed electrode, arranged in parallel in front and back. A movable cover was attached to the top of these fixed electrode tubes in a removable manner, and a mechanism was installed above each set of switches to simultaneously operate the three-phase movable covers. Connect the cable head of the cable to the lower part of the fixed electrode tube in front of each switch above,
A switchgear for branching distribution towers, in which each branch of a substantially horizontal molded bus bar for each phase that connects the same-phase switches of each set is connected to the lower part of a fixed electrode cylinder at the rear of each switch.