JPH0422486Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention eliminates the need for handholes, manholes, etc. by storing the equipment body such as a switch in a portable case that functions as a handhole. This article relates to a direct-buried equipment structure for power distribution lines that facilitates cable testing, maintenance and inspection work, bypass construction methods, grounding work, etc.

[Conventional technology]

A multi-circuit switch, which is one of the equipment for power distribution lines,
For example, it is housed in a hand hole formed under the surface of the sidewalk. The hand hole is constructed of concrete or the like to have a predetermined mechanical strength, and is connected to the cable conduit through a cable hole provided in the side wall. A power distribution line is constructed by connecting the multi-circuit switch in the handhole to the cable installed in the cable conduit, and power is supplied by opening and closing the multi-circuit according to the load situation.

[Problem that the invention attempts to solve]

However, as conventional multi-circuit switches are designed to fit the capacity of the distribution line and are housed in handholes, manholes, etc., handholes, manholes, etc. are no longer necessary. Therefore, there is a limit to the reduction of construction costs.
Also, for example, some circuits have a grounding terminal in one of the multiple circuits, but when you want to ground any one circuit, you must connect it to this grounding terminal by turning on the corresponding switching contact. Therefore, the operation is troublesome, and furthermore, since the positions and locations of handholes, manholes, etc. are fixed, there are inconveniences such as restrictions even when it is desired to lay a bypass line in a desired section.

[Means for solving problems]

The present invention was developed in view of the above, and aims to eliminate the need for handholes and manholes, and to facilitate cable testing, maintenance and inspection work, bypass construction methods, grounding work, etc. The present invention provides a directly buried type device structure for a power distribution line, which is housed in a case having mechanical strength, has a cable or a cable end section provided in advance, and has a high-voltage spare terminal provided for each circuit.

Hereinafter, the direct buried equipment structure for power distribution lines according to the present invention will be described in detail.

〔Example〕

Figures 1 to 3 show an embodiment of the present invention,
The main body of the device (switches, mechanical parts,
2 (including busbars, contacts, etc.) are housed therein, and a high-voltage flexible cable 3 connected to the device main body 2 is provided in advance. A stepped portion 4 is formed inside the main body case 1, and an operation panel 7 fixed thereto with a tightening bolt 6 via an airtight packing 5 is provided. The operation panel 7 is provided with an operation handle shaft 8 for opening and closing the switch, and high-voltage spare terminals 9 provided for each circuit, and a connection indicator line 10 connecting each circuit is shown. Further, a control panel 11 and a sensing and indicator panel 12 are arranged at predetermined positions (FIG. 3).
The upper part of the main body case 1 is closed by an operation lid 13, and a dustproof packing 14 and a waterproof packing 15 are provided between the two. As is clear from the illustration, the main body case 1 has an expanded portion 16 in which the operation lid 13 is located, and a drain hole 17 is formed in the bottom of this portion. Further, the operation lid 13 has a handle 18, and, like the main case 1, has mechanical strength that can withstand the load (for example, 20 tons) of a heavy vehicle (for example, a fire engine).

In order to have the above configuration, go to the site, dig the pedestrian road surface to a predetermined depth, bury the main body case 1 containing the device main body 2 there, and connect the high voltage flexible cable 3 to the cable of the cable conduit 20. A multi-circuit switch can be installed simply by connecting the In this laying state, attach the operating handle (not shown) to the operating handle shaft 8 and turn it on and off.
By performing a horizontal operation based on the display, it is possible to realize a predetermined opening or closing state of the switch. Furthermore, since each circuit is provided with a high-voltage spare terminal 9, cable tests, maintenance inspection work, grounding work, etc. can be easily performed. Furthermore, since the main body case 1 only needs to be buried in the ground, there is no need to construct hand holes, manholes, etc. in advance.
Therefore, there are no restrictions on location, and bypass construction can be used as needed.

FIG. 4 shows the operation panel 7, which is almost the same as FIG. 3, except that the arrangement of the high-voltage spare terminals 9 is slightly different.

FIG. 5 shows the multi-circuit switch described above in a single line diagram, in which the main body case 1 is provided with five circuits of high-voltage flexible cables 3, and each circuit is provided with a high-voltage spare terminal 9. In addition, fixed contact 3
1 and 32 and a movable contact 33 are provided, and by opening and closing them, any desired circuit connection can be established.

Figures 6a, b, c, and d show cases where the high-voltage flexible cable 3 pre-installed in the main body case 1 is pulled out at different positions, and if an appropriate one is selected according to the situation, on-site construction work can be carried out. becomes very easy.

FIG. 7 shows a state in which the high voltage flexible cable 3 pre-attached to the main body case 1 is connected to the pre-laid cable 30, and the multi-circuit switch can be easily connected by simply working on the connection part 40. The installation can be completed.

In FIG. 8, a pressure relief valve 41 is provided at the bottom of the main body case 1, and an underground hole 42 is formed in that part, and pebbles, gravel 43, etc. are placed therein. Therefore, even if an internal short circuit or the like occurs, the pressure can be released by the pressure relief valve 41, and the pebbles and gravel 43 absorb the pressure, thereby preventing the pressure from being released onto the road.

In addition, in the above embodiment, if the handle 18 is made to be able to be pulled out only with a special tool,
Accidents in which a person other than the person concerned opens the operation lid 13 can be eliminated.

[Effect of idea]

As explained above, according to the direct buried equipment structure for distribution lines of the present invention, a multi-circuit switch is housed in a case having a predetermined mechanical strength, and a cable or a cable terminal part is provided in advance in this case. In addition, high-voltage spare terminals are provided for each circuit, eliminating the need for handholes, manholes, etc., and making it easier to perform cable tests, maintenance inspections, bypass construction, grounding work, etc.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of the present invention,
FIG. 1 is a sectional view, FIG. 2 is a plan view, FIG. 3 is an explanatory diagram showing an operation panel, FIG. 4 is an explanatory diagram showing a modification of the operation panel, and FIG. 5 is an illustration of an embodiment of the present invention. Single-line connection diagram; Figures 6a, b, c, and d are explanatory diagrams showing modifications of the present invention; Figure 7 is an explanatory diagram showing the installation situation in an embodiment of the present invention; Explanatory diagram showing an example. Explanation of symbols, 1...Main case, 2...Device main body, 3...Pre-attached cable, 7
...Operation panel, 8...Operation handle axis, 9...
High voltage spare terminal, 13...operation lid.

Claims (1)

[Claims for Utility Model Registration] A multi-circuit switch is housed in a main body case having a predetermined mechanical strength, and a cable or a cable end portion connected to the multi-circuit switch in a predetermined relationship is housed in the main body case. The cable is formed in advance on the outside, and installed by directly burying it in the ground at the site and connecting the cable or the cable terminal part to the power distribution line, and the main body case is sealed by an operation panel that can be opened and closed. and has an operation panel therein, and the operation panel has on its surface an operation handle shaft for opening and closing the multi-circuit switch and a plurality of high-voltage spare terminals respectively provided for each circuit. Directly buried equipment structure for power distribution lines.