JPH1189016A - Flat conductor l-shaped connection structure in distribution panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To relieve electric field for improved breakdown voltage, by jointing the end parts of respective flat conductors in a cross direction so as to protrude or be flush from/with the end parts of other flat conductors in the lengthwise direction each other. SOLUTION: End parts of respective flat conductors 1, 2 are stacked into an L shape, a bolt 3 is inserted in holes 1a, 2a formed at each of them, and a nut 5 is screwed and fastened onto the bolt 3 fully. The end part of the flat conductor 1 in the cross direction is screwed and fastened so as to protrude from the end part of the flat conductor 2 by an amount of d1 , and the end part of the flat conductor 2 in the cross direction is screwed and fastened so as to protrude from the end part of the flat conductor 2 in the lengthwise direction by an amount of d2 . It is thus possible to position the protruding angular parts of the flat conductors 1, 2 so as to be in proximity to each other for dispersed electric field, thereby relieving the electric field.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an L-shaped connection structure of a flat conductor used for a bus or the like in an air-insulated switchboard or a gas-insulated switchboard (GIS).

[0002]

2. Description of the Related Art FIGS. 5 (a) and 5 (b) show a front view and a left side view of an L-shaped connection structure of a flat conductor in a conventional switchboard, respectively. 2a is provided, the ends thereof are overlapped in an L shape, bolts 3 are inserted into the holes 1a, 2a via washers 4, and the flat conductors 1, 2 are connected at 90 ° intervals by tightening with nuts 5. Note that there is play between the holes 1a and 2a and the bolt 3. In this case, one flat conductor 2 protrudes from the other flat conductor 1 in the length direction and the width direction.

[0003]

Here, an experiment as shown in FIG. 6 was conducted to examine the withstand voltage characteristics of the conventional flat conductor L-shaped connection structure as described above. That is, one flat conductor 2 is 1 mm longer in the length direction and 3 m longer in the width direction than the other flat conductor 1.
The flat conductors 1 while m projects linked to 90 degrees, the L-shaped connecting structure and opposed to L-shaped conductive portion (corresponding to the switchboard casing) 6 provided, SF ₆ 100%, the pressure P = 0.13
An impulse voltage is applied to the flat conductor 1 in an atmosphere of MPa,
At this time, the horizontal axis represents the distance L (electrode distance) between the portion closest to the conductive portion 6, that is, the end in the length direction and the end in the width direction of the flat conductor 2. On the vertical axis, characteristics as shown in FIG. in this way,
In the conventional L-shaped connection structure shown in FIGS. 5 and 6, the electric field is concentrated on the two corners of the flat conductor 1, and the withstand voltage (dielectric strength) is low.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to obtain a flat conductor L-shaped connection structure in a switchboard which can reduce an electric field and increase a withstand voltage. .

[0005]

According to a first aspect of the present invention, there is provided an L-type connection structure for a flat conductor in a switchboard, wherein each of the flat conductors has a widthwise end portion which is longer than each of the other flat conductor lengthwise ends. They are connected so that they protrude or become the same surface.

According to the flat conductor L-shaped connection structure in the switchboard according to the second aspect of the present invention, the longitudinal ends of the flat conductors protrude from the width ends of the other flat conductors or are flush with each other. Are connected as follows.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1A and 1B show a front view and a right side view of a flat conductor L-shaped connection structure in a switchboard according to a first embodiment.
As in the prior art, the ends of the flat conductors 1 and 2 are overlapped with each other in an L shape, the bolt 3 is inserted into the holes 1a and 2a provided respectively, and the nut 5 is fastened to the bolt 3. together to project the widthwise end portions of the conductor 1 from lengthwise end portions of the flat conductor 2 by d _1, the flat width direction end portions of the flat conductor 2 conductors 1
To fasten than longitudinal ends so as to protrude by d _2. Although there is play between the holes 1a and 2a and the bolt 3,
d ₁ ≧ 0 and d ₂ ≧ 0.

Here, assuming that d ₁ = 3.5 mm and d ₂ = 1 mm, SF _{6 is} 100% and pressure P = 0.13M as in the conventional case.
An impulse voltage is applied to the flat conductor 1 in an atmosphere of Pa, and the relationship between the distance (electrode distance) Lmm between the grounded conductive part 6 and the nearest portion of the flat conductors 1 and 2 and the minimum flashover voltage V _min KV is examined. As shown in FIG. 3B, it was found that the withstand voltage was improved by 10 to 15% as compared with the related art. This is because the projecting corners of the flat conductors 1 and 2 are located close to each other, so that the electric field is dispersed and relaxed.

FIG. 4 is a front view of a flat conductor L-shaped connection structure in a switchboard according to a second embodiment. In this case, the lengthwise end of the flat conductor 1 is shifted from the widthwise end of the flat conductor 2. together to protrude by d _3, it is fastened by bolts 3 and nuts 5 flat conductors 1 so as to protrude by d ₄ than the width direction end portion of the length direction ends of the flat conductor 1 Rights conductor 2. d ₃ ≧ 0 and d ₄ ≧ 0. Also in the second embodiment, the electric field is reduced, and the same effect as in the first embodiment is obtained.

[0010]

As described above, according to the first aspect of the present invention, each of the flat conductors has its widthwise end projecting or being flush with the lengthwise end of each of the other flat conductors. Since the flat conductors are connected, and the protruding corners of each flat conductor are located close to each other, the electric field is dispersed and relaxed, and the withstand voltage can be improved.

According to a second aspect of the present invention, the flat conductors are connected such that the longitudinal ends of the flat conductors project from the widthwise ends of the other flat conductors or are flush with each other. Therefore, it has the same effect as the first aspect.

[Brief description of the drawings]

FIG. 1 shows a flat conductor L in a switchboard according to Embodiment 1 of the present invention.
It is the front view and right side view of a shape connection structure.

FIG. 2 is an explanatory diagram of a withstand voltage test of a flat conductor L-shaped connection structure in a switchboard according to the first embodiment.

FIG. 3 is a withstand voltage characteristic diagram of a flat conductor L-shaped connection structure in a switchboard according to the related art and the first embodiment.

FIG. 4 is a front view of a flat conductor L-shaped connection structure in a switchboard according to a second embodiment.

FIG. 5 is a front view of a conventional flat conductor L-shaped connection structure in a switchboard.

FIG. 6 is an explanatory diagram of a withstand voltage test of a conventional flat conductor L-shaped connection structure in a switchboard.

[Explanation of symbols]

 1, 2 ... flat conductor 1a, 2a ... hole 3 ... bolt 5 ... nut

Claims (2)

[Claims] 1. An L-shaped flat conductor connection structure in a switchboard, wherein ends of two flat conductors arranged in a switchboard are overlapped in an L shape, bolts are inserted into holes formed in the respective flat conductors, and fastened by nuts. A flat conductor L-shaped connection structure in a switchboard, wherein the widthwise ends of the flat conductors are connected to each other so as to protrude from the lengthwise ends of the other flat conductors or to be flush with each other. 2. An L-shaped flat conductor connection structure in a switchboard, wherein ends of two flat conductors arranged in a switchboard are overlapped in an L shape, bolts are inserted into holes provided in the respective flat conductors, and fastened by nuts. A flat conductor L-shaped connection structure in a switchboard, wherein the longitudinal ends of the flat conductors are connected to each other so as to protrude from the width ends of the other flat conductors or to be flush with each other.