JPH0514489B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for live-cutting an edge wire in both terminals of an overhead power distribution line.

(Prior art) For example, as shown in FIG. When carrying out construction work, a construction line 5 is used to connect the two nearest anchoring columns 2 on both sides, and a construction switch 6 is connected in the middle of the construction line 5. At this point, the edge wires 7 of both restraining columns 2 on both sides of the desired construction site were cut off while they were still live, and the power to the desired construction site was cut off before construction could be carried out.

In this way, construction can be carried out while minimizing the power outage area.

The structure of both retaining columns 2 when carrying out such construction will be explained with reference to FIG. That is, both retaining columns 2
A cross arm 8 is attached to the cross arm 8, and the overhead power distribution lines 3 on both sides are secured to the arm 8 through tension insulators 9 and retaining clamps 10, respectively. They are connected by a wire 7, and a midway portion of the edge wire 7 is fixed to a preventive insulator 11 erected on a cross arm 8 by a binding wire 12.

Conventionally, when cutting the edge line 7 in a live state at the both anchoring columns 2, the worker cut it directly, so the overhead distribution lines 3, tension insulators 9, It was necessary to attach insulating armor (not shown) to the retaining clamp 10 and the edge line 7 other than the cut location.

(Problems to be Solved by the Invention) However, when cutting the edge wire 7 with the insulating armor attached, there was a problem in that it took a very long time to attach and remove the insulating armor, resulting in poor workability.
Furthermore, cutting work that requires a worker to approach the cutting site poses a problem that involves the risk of electric shock. Furthermore, in the past, in order to avoid short-circuit accidents caused by contact between the cut points of the edge wires, or ground faults caused by contact between the cut points and cross arms, etc., the ends of the cut edge wires were There was a problem in that it was necessary to take measures to prevent access by bending it away from the other end, providing insulation protection, and fixing it.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for live-cutting an edge line, which can cut the edge line efficiently and without danger, and without taking special measures to prevent access.

(Means for solving the problems) The means of the present invention for achieving the above object are as follows:
An explanation will be given with reference to FIGS. 1 to 5, which correspond to embodiments.

In the present invention, a tension insulator 9 is attached to the cross arm 8 of both retaining columns 2.
The overhead power distribution lines 3 on both sides are held down through the holding clamps 10, respectively, and the holding clamps 10 on both sides are connected by an edge line 7,
A midway portion of the edge line 7 is a line cutter that cuts the edge line 7 in a live state at a point where both the anchoring columns 2 are fixed to the preventive insulator 11 supported by the cross arm 8. In the live wire cutting method, while the edge wire 7 near the cutting point is gripped by the gripping hot stick 13 on one side of the preventive insulator 11, the edge wire 7 is held by one of the clamps 10.
It is cut with the cutting hot stick 14 at the offset position, and the edge wire 7 near the cut point is cut with the gripping hot stick 1 on the other side of the preventive insulator 11.
3, cut the edge line 7 at a position near the other retaining clamp 10 with the cutting hot stick 14, and then attach the cut middle edge line part ₇₃ to the hot stakes 15, 16.
The preventive insulator 11 is removed together with the operation.

(Function) When cutting the edge wire 7 in this manner, all the work can be done using hot sticks, so there is no need to install insulating armor, and therefore there is no need to install or remove it. In addition, the cutting is done at the points near both ends of the edge line 7, and the middle part ₇₃ of the cut edge line is removed, so even if there is a time and date before the connection work of the edge line 7 is completed when the construction is completed. It becomes possible to reliably avoid a situation where the cut points accidentally approach each other and cause a large short circuit or ground fault arc, without taking any special approach prevention measures.

(Example) Examples of the present invention will be described in detail below with reference to FIGS. 1 to 5. First, as shown in FIG. 1, while the intermediate portion of the edge wire 7 on one side of the preventive insulator 11 is gripped by the gripping hot stick 13, the portion 7A of the edge wire 7 closer to the binding line 12 is held by the cutting hot stake 14. to disconnect the wire while it is live. The mutual ends of the cut hemline 7 are separated from each other by operating the gripping hot stick 13. By cutting in this manner, it is possible to prevent the cut edge wire 7 from hanging down and causing an arc between it and other parts. Next, while continuing to grip with the gripping hotstack 13, the portion 7B near the retaining clamp 10 is cut with the cutting hotstack 14, and the edge line portion 7, which has been gripped with the gripping hotstack 13 and cut on both sides, is then cut. ₁ will be removed. Edge line 7 on the opposite side of the preventive insulator 11
Also, in the same manner as described above, the portion 7C of the edge wire 7 closer to the binding wire 12 and the portion 7D closer to the retaining clamp 10 are cut in a live wire state using the gripping hot stake 13 and the cutting hot stake 14. However, the edge line portion ₇₂ with both sides cut off is removed.

In this way, as shown in FIG.
Both side portions are removed, leaving the intermediate edge line ₇₃ .

Next, as shown in FIG. 3, while holding the preventive insulator 11 with the insulator gripping hot stick 15, remove the nut 18 screwed onto the bolt 17 of the preventive insulator 11 with the nut turning hot stick 16.
The preventive insulator 11 is removed together with the intermediate edge line portion ₇₃ .

Next, as shown in FIG. 4, both cut ends 7 ₄ ,
_7. Attach the insulating end caps 18 to the end caps 18 and 5 using the end cap attachment hot sticks 19, respectively, to obtain the condition shown in FIG.

In addition, in the cutting process shown in FIG.
If the edge line 7 is a hot stick and can be easily bent, the edge line 7 is cut only at the portions 7B and 7D near the retaining clamp 10, and both ends of the intermediate edge line ₇₃ with both ends cut are bent. It may be separated from the other part that has been cut.

Further, the intermediate edge line portion ₇₃ may be removed from the preventive insulator 11 and removed.

(Effects of the Invention) As explained above, in the method for cutting live edge wires according to the present invention, all kinds of hot stakes are used to cut the live edge wires, so insulating protective equipment is not required. There is no need for attachment, and therefore there is no need for attachment and detachment work, and cutting work can be carried out efficiently. In particular, in the present invention, when cutting the edge line with the cutting hot stick, the edge line is held while being held by the gripping hot stick, so that the cut edge line may hang down and cause a short circuit or ground. It is possible to reliably prevent the occurrence of cross-arcs. Furthermore, since the edge line is cut near both ends, and the middle part is removed after cutting, even if there is time to connect the edge line when construction is completed, there is no risk of the cut points being accidentally approached. Therefore, it is possible to reliably avoid a situation where a large short circuit or ground fault arc occurs without taking any special approach prevention measures.

[Brief explanation of drawings]

FIGS. 1 to 5 are explanatory diagrams showing each step of the live wire cutting method according to the present invention, FIG. 6 is an explanatory diagram of the power distribution route, and FIG. 7 is a side view showing the structure of both anchoring columns. . 1...Pull-through mounting pillar, 2...Both retaining mounting pillar, 3...
Overhead distribution line, 4... Distribution route, 5... Construction line, 6... Construction switch, 7... Border line, 8...
... Bracelet, 9... Tension insulator, 10... Retaining clamp, 11... Preventive insulator, 12... Binding wire, 1
3... Hot stick for gripping, 14... Hot stick for cutting, 17, 15... Hot stick for gripping insulator, 16... Hot stick for turning a nut.

Claims (1)

[Claims] 1 Overhead power distribution lines on both sides are tied to the arms of both tie-down columns via tension insulators and tie-down clamps, respectively, and the tie-down clamps on both sides are connected by an edge line, and the line is connected to the edge line. In the live wire cutting method of the edge line wire, the middle part of the edge line wire is cut in a live wire state at a location of both of the anchoring device columns fixed to the preventive insulator supported by the cross arm,
While gripping the edge wire near the cut point on one side of the preventive insulator with a gripping hot stick, cut the edge wire at a position near one of the retaining clamps with the cutting hot stake, and While holding the edge wire near the cutting point on the other side of the insulator with a gripping hot stake, cut the edge wire with the cutting hot stake at a position near the other retaining clamp, and then cut it. A method for cutting a live line of an edge line, characterized in that the middle edge line part is removed together with the preventive insulator by operating a hot stick.