JPH0140564B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an underground distribution line branching device that has improved operability in opening/closing operations of buried switches and inspection operations of underground cables, which take up almost no operation space.

Sectional opening/closing and high-voltage branching of high-voltage underground distribution lines, such as 6KV underground distribution lines, are often performed using distribution towers or high-voltage cabinets installed above ground.

However, as urbanization progresses, it has become difficult to install power distribution towers above the ground (on narrow streets) due to traffic hindrances and visibility obstructions. It is becoming difficult to install such systems due to the increasing demand for effective use of indoor space due to soaring land prices, and low maintenance response in emergencies.

Under these circumstances, there is an inevitable tendency to bury high-pressure branching devices underground, but even if they are buried underground, it is not possible to secure sufficient burial space. Therefore, there is a risk that it will not be possible to secure an operation space for opening and closing the buried switch or inspecting the underground cable, and the operability of such operations will be reduced.

In view of the above, the present invention aims to improve the operability of the opening/closing operation of buried switches that take up almost no operation space, and the inspection and maintenance operations of underground cables.
The present invention provides an underground distribution line branching device in which opening/closing operations and attachment/detachment operations of an underground cable to/from a switch can be performed using an operating handle.

The underground distribution line branching device according to the present invention will be explained in detail below.

1 and 2 show an embodiment of the present invention, which includes a hand hole 2 having a removable iron lid 1, and a buried switch (gas-filled ) 4, an opening/closing operation section 6 for controlling a movable electrode (not shown) via an operation tube 5 for opening and closing the buried switch 4, and an operation display board 7 that accommodates the opening/closing operation section 6. Operation box 8
, a sediment prevention plate 9 that cannot be removed unless the operation box 8 is opened, a cable 11 connected to the burial switch 4 via the terminal connection part 10 , and the burial switch 4 are connected to each other. Mold busbar 1
2, and a cable 11 provided at the terminal connection part 10
an opening/closing operation handle 15 and a cable attachment/detachment handle 16.
is shown in FIG.

3A and 3B show the attachment/detachment operation part 13 attached to the terminal connection part 10. Further, the terminal end holding plate 14 is fixed to the bolt 21 by a nut 22, and has a hole through which the head 13b of the attachment/detachment operation section 13 passes.

FIG. 4 shows the configuration of the terminal connection part 10, which is a metal pipe flange 3 welded and fixed to the switch main body 4.
1, a flange nut 32 that is screwed to the pipe flange 31, and a bushing 35 made of epoxy resin that has packings 33 and 34 between the pipe flange 31 and the flange nut 32 and penetrates the switch main body 4 in a watertight manner. , a receptacle conductor 36 provided in the bushing 35 and connected to a fixed electrode (not shown) in the switch main body 4, and a pin conductor 37 mated with the receptacle conductor 36.
and a cable 11 having a cable conductor 39 connected to a pin conductor 37 via a conductor connection part 38.
and an internal semiconducting layer 4 provided by integral molding from the conductor connection portion 38 to the cable 11.
1, an insulator layer 42 and an outer semiconducting layer 43;
An attachment/detachment operation section 13 provided at the bend of the external semiconductive layer 43, a voltage detection section 44 provided at the outer periphery of the terminal end of the cable 11, and a spacer 45 inserted between the cable 11 and the insulator layer 42. , outer semiconducting layer 4
3 and a cover sleeve 46 fitted over the pipe flange 31.

In the above configuration, the iron cover 1 of the hand hole 2
When the lid of the operation box 8 is removed after opening, the opening/closing operation section 6 is exposed, and by engaging the opening/closing operation handle 15 and rotating it in a predetermined direction, the switch 4 is opened via the operation tube 5. can be opened. By this opening, the display board 7 displays "OFF". Sediment prevention plate 9 is removed by removing the lid of operation box 8.
can be removed, and when the nut 22 is loosened and the presser plate 14 is removed, the attachment/detachment operation section 13 for attaching and detaching the cable 11 is exposed.

When the cable attachment/detachment handle 16 is hooked onto the ear part 13b of the attachment/detachment operation part 13 and pulled up toward the opening of the hand hole 2, the pin conductor 3 of the terminal connection part 10 is removed.
7 and the receptacle conductor 36 are released, and the cable 11 can be removed from the switch 4.
For example, by connecting an accident point probe to the pin conductor 37 connected to the conductor 39 of the removed cable 11 and sending out exploration pulses, the accident point can be detected. It can be grounded for construction purposes. On the other hand, for attaching the cable 11 to the switch 4 and closing the switch 4, the cable attachment/detachment handle 1
6. This can be achieved by using the opening/closing operation handle 15 and performing the operation opposite to that described above. The present invention can be applied to high-pressure and low-pressure underground branching devices, underground multi-circuit switching devices, etc., and can be safely operated even when submerged in water.

As explained above, according to the underground distribution line branching device according to the present invention, opening/closing operations and attachment/detachment of underground cables can be performed using the operation handle, so opening/closing operations of underground switches that require almost no operation space are possible. It is also possible to improve the operability of underground cable inspection and maintenance operations.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are explanatory diagrams showing one embodiment of the present invention. FIGS. 3A and 3B are explanatory diagrams showing the terminal connection part. FIG. 4 is an explanatory diagram showing a cross section of the terminal connection part. Explanation of symbols 1...Iron lid, 2...Hand hole, 3
... Frame, 4... Buried switch, 5... Operation pipe, 6... Operation unit, 7... Display board, 8... Operation box, 9... Sediment prevention plate, 10... Terminal connection part, 11... Cable, 12...
Mold busbar, 13...attachment/detaching operation section, 14...pressing plate, 15...opening/closing operation handle, 16...cable attachment/detachment handle.

Claims (1)

[Claims] 1. A buried switch installed in a buried space having an opening communicating with the ground; and a movable electrode of the buried switch connected to the movable electrode and engaged with an opening/closing operation handle operated from the ground. an opening/closing operation unit that controls opening and closing by using the switch; a terminal connection unit that connects the underground cable to the underground switch in a fitting manner; and a cable attachment/detachment handle that is fixed to the termination connection unit and that is operated from the ground. An underground distribution line branching device comprising: an attachment/detachment operation section that engages with the underground cable to control connection/disconnection of the fitting connection of the underground cable.