JPH036131Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a spacer for power transmission lines, and particularly to a spacer that is effective when used in multi-conductor power transmission lines having six or more conductors.

[Prior Art] In recent years, the number of conductors in overhead power transmission lines has gradually increased for the purpose of UHV power transmission or low-inductance power transmission, and lines with as many as 6 to 10 conductors have come into practical use. As the number of conductors increases, the outer diameter of the wire bundle itself also increases, with wire bundles reaching around 1,500 mm now being put into practical use.

In such a power transmission line, as shown in Fig. 5, when the conductors W and W are held and fixed by the spacer S, vibrations in the line direction as shown by the arrows in the figure are likely to occur in the conductors W and W. The frequency of this vibration is 2
Although it is about Hz, its amplitude is 100mm in the line direction.
The degree of vibration also moves, and conventional spacers with a rigid structure are subject to abnormal stress due to this vibration, and there is a risk that they will break at an early stage. Therefore, even if a flexible structure is used, in the unlikely event that a short circuit occurs in the power transmission line, a strong centripetal force will be generated due to electromagnetic action.
This time, there was a fear that he would not be able to withstand its destructive force.

[Problems to be solved by the invention] In order to withstand the above-mentioned destructive force, it is sufficient to make the structure strong, but this naturally increases the weight, and furthermore, the power transmission lines mentioned above As the size of the spacer increases, the spacer also increases in size, making it bulky and inconvenient to handle. For this reason,
There has been a strong desire to provide a spacer that is lightweight and easy to manufacture and handle, and which does not generate undue stress even when exposed to vibrations in the direction of the transmission line. The present invention has been made to solve such problems.

[Means for Solving the Problems] In view of the above-mentioned circumstances, the present invention solves these problems by changing the structure of the spacer, and changing the spacer frame to a fixed length U-shaped steel section and a joint member. The joint member has a relatively thin base part with a hole facing the center of the spacer, and an internal opening angle formed on both sides of the base part to form the polygon of the spacer frame. a connecting piece that protrudes at an angle that matches the direction and can be fitted into the inner surface of the shaped steel, and each of the shaped steel has a connecting piece of the joint member so that its opening face faces the ground side. The holes in each base part are configured so that the middle part can be bent in the longitudinal direction of the electric wire, and there is a hole below the hole for locking into the hole in the base part. A spacer for a multi-conductor power transmission line is constructed in which a clamp connecting rod having a stopper is spring-biased toward the center of the spacer and is swingably fixed with a small gap.

[Function] Since the spacer according to the present invention is configured as described above, the entire spacer has a flexible structure as described below, and the connecting rod of the spacer can freely move in the longitudinal direction of the wire bundle and in the radial direction. Since it is movable, it has a margin of movement to follow the vibrations of the conductor, and there is no risk of unreasonable stress being generated. Furthermore, since it is constructed from shaped steel, it is of course lightweight, and since the shaped steel is constructed to a fixed length and connected by joint members, manufacturing and handling can be simple and easy. It is.

[Example] This will be explained below based on examples.

FIG. 1 is a front view showing an embodiment of a spacer according to the present invention. The conventional spacer frame is
Since it is composed of a circular or polygonal monolithic frame, its outer diameter of 1,500 mm causes various inconveniences in handling. This idea is
Focusing on this point, the spacer frame was constructed into a polygonal structure by sequentially connecting the fixed-length shaped steel 1, 1 and the joint members 2, 2 as shown in Fig. 1, making it easy to manufacture and handle. It is something that could be realized.

Moreover, since the main structure is made of shaped steel, not only is the entire structure lightweight, but it is also able to maintain sufficient strength against the centripetal force at the time of the short circuit.

Thus, the shaped steels 1, 1 having both such ease of handling and strength are connected by joint members 2, 2 unique to the present invention, which will be described below. This makes it possible to ensure sufficient strength of the shaped steel in addition to the above-mentioned ease of manufacture.

That is, FIG. 3 is an explanatory diagram with a partial cross section showing the structure of the joint member 2, and FIG.
FIG. The joint member 2 is composed of a relatively thin base part 5 and coupling pieces 3 formed on both sides of the base part 5, and the base part 5 has a hole 4 that faces the center of the spacer when assembled to the spacer. It is formed.

The connecting pieces 3, 3 are such that the direction in which they protrude from the base portion 5 in which they are formed coincides with the opening angle direction of the inner angle of the polygon of the polygonal frame constituting the spacer, and the shape steel 1 . With this configuration, the shaped steel 1,
1 to the connecting pieces 3, 3, and in that state, for example, by welding the abutting portions of the two, a strong frame can be constructed by itself, and the connecting pieces 3, 3
Since the protruding angle of the spacer matches the inner angle of the polygonal shape of the spacer, there is no possibility that unreasonable stress will be generated in the connecting portion.

As shown in FIG. 2, the connecting rod 11 of the clamp 10 is urged toward the center of the spacer by the spring 6 and engaged by the stopper 12 in the hole 4 formed in the base portion 5 of the joint member 2. It is stuck in a stopped state. Moreover, a small gap 7 is formed between the inner circumference of the hole 4 and the outer circumference of the connecting rod 11,
The connecting rod 11 is configured to be able to swing around this hole 4 to some extent. In FIG. 2, reference numeral 13 denotes a nut screwed onto the connecting rod 11 to fix the spring 6.

By being biased by the spring 6 in this way, the connecting rod has a movement distance that allows it to move outward from the center of the spacer, that is, in the radial direction of the wire bundle to which the spacer is attached. . Therefore, as already explained with reference to FIG. First of all, the vibration is absorbed by the swinging of the connecting rod, and when the amplitude of the vibration can no longer be followed by the swinging, the connecting rod, which had been biased by the spring 4, releases the spring. Since it can extend outward against the flow, the amount of movement of the conductor can be absorbed by the extension. This amplitude absorption effect makes it possible to eliminate the abnormal stress that is applied to some of the structural members that occurs in conventional spacers.

If it is anticipated that the amount of movement of the conductor will become even larger and the above structure alone will not be able to absorb it, as shown in Figure 6,
The connecting rod 11 of the clamp 10 may be configured with a clevis 14a and an eye 14b at the intermediate portion, penetrated by a bolt 14c, and the connecting rod 11 may be provided with a bending portion 14 that can be bent in the longitudinal direction of the electric wire. , thereby making it possible to further increase the ability to follow the amplitude of the vibration.

In the above, the shape of the shaped steel constituting the spacer frame may be selected from various shapes, but from the viewpoint of balance of strength, it is preferable to have a square cross section. However, considering the possibility of water intrusion into the interior, a U-shaped cross section is appropriate. When using a shaped steel with a U-shaped cross section like this, if the opening faces upward when installed, icing and snow will form on the opening.
Not only does the weight of the spacer increase, but also the wind pressure load increases, which is undesirable. In order to prevent this, all openings of the shaped steel of the spacer frame should face the ground surface. The configuration of the joint member according to the present invention is extremely convenient for such a purpose, and the angle of the cut-off surface on the mold steel side of the contact portion between the mold steel 1 and the base portion 5 of the joint member 2 is By changing the shape of the joint member, it is possible to connect the joint member without changing its shape. Fig. 3 shows the situation, and the hatching indicating the interrupted plane in the figure indicates the bottom of the U-shaped steel.
The side without hatching indicates the opening. It can be seen that the opening planes are reversed on the left and right sides as viewed in the drawing. Since the orientation of the opening plane can be easily changed in this way, for example, if the lower side of the drawing in Figure 1 is the ground side, the opening plane of the three steel shapes in the upper half of the drawing can be set to the center of the spacer on the drawing. If the lower half faces the outer side of the spacer, all the opening surfaces of the shaped steel will face the ground side. This makes it possible to minimize the formation of ice and snow.

[Effects of the invention] As detailed above, according to the spacer according to the invention, even when vibrations that cause the conductors to move in the line direction are generated when used in a multi-conductor power transmission line, the clamp part follows the vibrations. Since the clamp connecting rod can also move freely, there is no occurrence of abnormal stress in some of the constituent members of the spacer as in the conventional example, and it is therefore possible to prevent the spacer from being damaged. Furthermore, since the frame is made of shaped steel, it is lightweight as a whole, but
Not only does it have sufficient strength and can withstand even if force is applied due to a short circuit, but its joints are constructed to match the internal angles of the polygon, so the frame Excellent strength can be maintained without adding strain to the entire structure. Furthermore, in the case of steel molds that have openings, the prevention of icing and snow can be achieved by directing the openings toward the ground, and today, overhead power transmission lines are becoming more multi-conductor. has great significance.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the spacer according to the present invention, FIG. 2 is an explanatory view with a partial cross section showing the structure of the joint part, and FIG. 3 is a front view showing the structure of the joint member. An explanatory diagram with a partial cross section, FIG.
Fig. 3 is a bottom view of the joint member, Fig. 5 is an explanatory diagram showing the vibration in the line direction that occurs in a multi-conductor transmission line, and Fig. 6 is a front view showing another embodiment of the clamp connecting rod. be. 1; Type steel, 2; Joint member, 3; Connecting piece, 4;
Hole, 5; Base, 7; Small gap, 10; Clamp, 1
1; Connecting rod, 12; Stopper, 14; Bent part.

Claims (1)

[Scope of utility model registration request] The spacer frame is constructed in a polygonal shape connected by a fixed length U-shaped cross-section steel and a joint member,
The joint member has a relatively thin pedestal portion with a hole toward the center of the spacer, and is formed on both sides of the pedestal portion and protrudes at an angle that matches the opening direction of the inner angle forming the polygon of the spacer frame. and a coupling piece that can be fitted onto the inner surface of the shaped steel, and each of the shaped steel having a U-shaped cross section is fitted and connected to the coupling piece of the joint member so that its opening face faces the ground side. A clamp connection is formed in the frame, and the hole in each base part has a middle part bent in the longitudinal direction of the electric wire, and has a stopper below the clamp connection for locking in the hole in the base part. A spacer for a multi-conductor power transmission line, in which a rod is spring-biased toward the center of the spacer and fixed with a small gap so that it can swing.