JP2986270B2 - Split type yoke fitting for 6 conductors - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a split-type yoke fitting which is used when the number of conductors corresponding to one to be connected to a transmission line tower is six.

[0002]

BACKGROUND OF THE INVENTION FIG 2, a plan view of the angle-type suspension tower T of a horizontal angle theta, the arm A ₁ to the right of the tower, as shown in FIG. 3, 1 equivalent Ri 6 conductors ( A split-type yoke fitting (hereinafter, referred to as a yoke fitting) 1 of a wire is suspended via a shading device B.

The yoke fitting 1 comprises an upper piece 2, a lower piece 3, and a pair of connecting pieces 4 and 5 made of a steel plate.

[0004] The upper piece 2 and the lower piece 3 have a curved and substantially arcuate state. The connecting pieces 4 and 5 are overlapped on the left and right sides of the upper piece 2 and the lower piece 3 with a part of the upper and lower ends overlapped, and the overlapped portions are fixing members 6a to 6d made of bolts and nuts. 6c 'and 6d', and are fixed such that straight lines connecting the fixing members 6a and 6c and 6b and 6d are parallel to each other. The lower piece 3 has two fixing members 6c, 6 for the connecting pieces 4, 5.
The provision of c 'and 6d, 6d' is intended to fix the connecting pieces 4 and 5 to the lower piece 3 without rotating them, thereby facilitating the assembly of the yoke piece 1. be able to.

The upper piece 2 and the lower piece 3 are provided with three clamp mounting holes 7, 7,... Respectively at a central portion and a left and right portion, and are formed by lines connecting the clamp mounting holes 7, 7,. The positions of the clamp mounting holes 7, 7,... And the lengths of the connecting pieces 4, 5 are determined so that the square becomes a regular hexagon. Therefore, when the respective mounting clamp C ₁ -C ₆ in each clamp mounting holes 7, 7 ..., the polygon formed by a line connecting them clamp C ₁ -C ₆ also becomes regular hexagon (2 points 3 See dashed line).

[0006] Such a split-type yoke fitting 1 is characterized in that it can be split and transported, and can be split and manufactured, even if it is enlarged for ultra-high voltage power transmission.

[0007]

However, when the above-mentioned conventional yoke fitting is used for an angle type suspension tower, the load applied to one of the pair of connecting pieces is less than a predetermined value, and the lower yoke piece is not used. May be extremely unbalanced, and electrical troubles such as gap discharge may occur.

Further description will be given with reference to FIG. 1 used in the embodiment of the present invention. The horizontal deflection angle of the yoke fitting 1 due to the horizontal angle (θ in FIG. 2) The angle formed by the yoke fitting 1 and the vertical line b.
And the relation between the distance L between the two connecting pieces 4,5, load the load P _A following a predetermined connecting piece 4, for example, or a 300kgf or less, in some cases compression, negative load, i.e. the coupling piece 4 Forces may act.

Normally, the load applied to both connecting pieces 4 and 5 is several tons in the case of 6 conductors. When the load applied to one of the connecting pieces becomes less than a predetermined value, an electrical obstacle such as gap discharge occurs. Is known.

Accordingly, an object of the present invention is to provide a yoke fitting for solving the above-mentioned disadvantages.

[0011]

In order to achieve the above object, a yoke fitting according to the present invention comprises three conductors, each of which is arranged at an apex of a regular hexagon, and each of which is composed of an upper piece and a lower piece. And a pair of connecting pieces that are connected to each other via clamps and that connect the mounting positions of the upper piece and the lower piece with each other by a pair of connecting pieces that are parallel to each other.
In the bracket, the interval between the parallel lines is determined by the following equation. _{L ≧ P 1 · m (2cos30} ° · tan η-1) / (P A -3/2 P 1) where, L is the load applied to each clamp of the gap parallel to the line (mm), P ₁ lower piece (kg · f), m is the length of the regular hexagon piece (mm), eta is the deflection angle (°), P _a is the load applied to the connecting piece towards shared load is smaller of the pair of connecting pieces (kg
・F) .

[0012]

In the above construction, when the distance L between the pair of connecting pieces satisfies the above equation, the load applied to one connecting piece is maintained at a value higher than the load causing an electrical failure or the like, and the load distribution of the lower piece is unbalanced. Due to the balance, the yoke fitting does not cause electrical trouble such as gap discharge.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A yoke fitting according to the present invention will be described below with reference to the drawings. Note that the same reference numerals are used for the same components as those in the related art shown in FIG.

FIG. 1 is a front view similar to FIG. 3 when the lower end of the shaving device B is mounted in a mounting hole 2a provided in the upper center of the upper piece 2 and has a predetermined deflection angle η. Is suspended.

The mounting holes 2a are provided with respective clamp mounting holes 7, 7.
The upper and lower sides of a regular hexagon (see the two-dot chain line in FIG. 1) formed by the lines connecting
Is set to pass through the center O of the regular hexagon.

In the pair of connecting pieces 4 and 5, respective lines d and d connecting the mounting positions of the upper piece 2 and the lower piece 3 are parallel to each other, and a distance L between the two lines d and d is a predetermined gap. It is provided with keeping. This interval L (mm) can be obtained by the following equation. _{L ≧ P 1 · m (2cos30} ° · tan η-1) / (P A -3/2 P 1) However, P ₁ is the load (kg · applied to the respective clamp of the lower piece
f), m is a positive hexagonal piece length (mm), eta is the deflection angle (°), P _A is the load applied to the connecting piece towards shared load is smaller of the pair of connecting pieces (kg · f) It is.

Next, the actual use state of the yoke fitting 1 will be described. First, the deflection angle η is in the range of 3 ° to 20 °, and the load supported by the lower piece 3 is, for example, about several tons if the yoke 1 is for six conductors.

According to the knowledge of the present inventors, the transmission voltage is 5
In the case of 00 KV, when the deflection angle η is a predetermined angle, the share of the load of the pair of connecting pieces 4 and 5 changes, and when the load of one of the connecting pieces becomes less than 300 kgf, gap discharge or the like occurs. Electrical failure occurs. The load that causes such an electrical disturbance naturally depends on the power transmission voltage, and if the voltage is lower than the above-described voltage, the load becomes smaller.

[0019] Therefore, the yoke member 1 according to this embodiment, as the load P _A of the coupling piece 4 is the load not caused at least electrical fault, determine the spacing L of the pair of connecting pieces 4,5 Have been. Further, according to the experiments of the present inventors, when the transmission voltage is 500 KV or more, the interval L is 60
If 0mm above, to keep the load P _A of the deflection angle η is 3 ° connection even to 20 ° piece 4 than 300kg have been identified. [Experimental example] In the yoke fitting 1 shown in FIG. 1, when the conductor is arranged at the vertex of a regular hexagon having a side length of 800 mm and the total load of both connecting pieces 4 and 5 is 21000 kg, the deflection angle η is 5
° and the interval L is 550 mm, P _A = 2000 kgf,
P _B = 19000 kgf, and when the interval L is 600 mm, P _A = 3000 kgf and P _B = 18000 kgf. Incidentally, P _A is 0 distance L is in the vicinity of 450 mm, a compressive force to the connecting piece 4 becomes negative is applied at less.

When the deflection angle η is 10 ° and the interval L is 600 mm, P _A = 4000 kgf and P _B = 17000 kgf. When the distance L is around 500 mm, it becomes 300 kgf.
P _A will be negative in the 450mm below.

When the deflection angle η is 20 ° and the interval L is 600 mm, P _A = 7000 kgf and P _B = 14000 kgf. Incidentally, PA = 300 kgf next near distance L is 280 mm, equal to or less than P _A = 0 at 200mm below.

[0022]

According to the yoke fitting of the present invention, the distance L (mm) between the lines connecting the mounting portions is defined as L ≧ P ₁ · m (2 cos 30
° · tan η-1) / (P _A −3/2 P ₁ ) (However, P ₁
Is the load (kg · f) applied to each clamp on the lower piece, and m is positive 6.
The length (mm) of one piece of the square, η is the deflection angle (°), and P _A is the load (kg) applied to the smaller one of the pair of connection pieces when the deflection angle is greater than or equal to a predetermined value. · f) Ru with nitrous <br/>. ), The load applied to each connecting piece of the pair of connecting pieces is greater than or equal to the load that does not cause an electrical failure when the yoke bracket is suspended on the angle type suspension tower, and the load on the lower piece is The distribution does not cause electrical disturbance such as gap discharge.

[Brief description of the drawings]

FIG. 1 is a front view of a yoke piece according to an embodiment of the present invention.

FIG. 2 is a front view of a state in which a conventional yoke piece is suspended on an angle type suspension tower.

FIG. 3 is a plan view of an angle type suspension tower.

[Explanation of symbols]

1 (Yo - click bracket) split Yo - click fitting 2 top piece 3 lower piece 4,5 connection piece T tower (angle type suspension towers) C ₁ -C ₆ Clamp L Interval

Claims (1)

(57) [Claims] 1. Among six conductors having a relationship arranged at the apexes of a regular hexagon, three conductors are respectively attached to an upper piece and a lower piece via a clamp, and attachment positions for the upper piece and the lower piece are provided. In a six-conductor split-type yoke fitting connected by a pair of connecting pieces in which respective lines connecting the six conductors are parallel to each other, the interval between the parallel lines is determined by the following equation. Split-type yoke fittings. L ≧ P ₁ · m (2 cos 30 ° · tan η−1) / (P _A −3/2 P ₁ ) where L is the distance (mm) between the parallel lines, and P ₁ is applied to each clamp of the lower piece. load (kg · f), m is the length of the regular hexagon piece (mm), eta is always horizontal deflection angle (°), P _a is applied to the connecting piece towards shared load is smaller of the pair of connecting pieces Load (kg · f) .