JPS591383Y2 - Kakusenyou damper - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an overhead wire damper for preventing gear roping vibration.

Conventionally, various methods have been attempted to prevent short-circuit accidents between lines due to low-frequency (0.1 to IHz) large-amplitude gearropping in multi-conductor overhead lines.

For example, the upper and lower overhead lines may be designed with sufficient lateral offset to prevent short circuits between each overhead line, or an insulator such as an interphase link may be inserted between each overhead line to force each overhead line to Short-circuit accidents are prevented by maintaining the spacing between overhead wires, and by constructing split towers for lines where accidents are likely to occur, and by increasing the spacing between overhead wires.

However, design methods that provide sufficient offset and methods that include split towers increase construction costs, and methods that use interphase links simply maintain the mutual spacing between each overhead line mechanically, so it is not an active prevention method. It does not have a vibration effect.

Thus far, there has been no effective damper that has natural vibrations that are compatible with low frequency vibrations such as gearropping.

In view of this point, the present invention provides a damper for an overhead line that prevents vibration of a multi-conductor overhead line by consuming the energy of low-frequency, large-amplitude vibrations during gearropping.

The principle of the present invention is to convert vibrations during gear roping into rotational motion, and to absorb this rotational motion by the torsional force of the rod, thereby preventing this low frequency vibration.

The conversion of low frequency vibrations into rotational motion is carried out by rods with eccentric weights attached to the spacers between the overhead wires.

The present invention will be described in detail below with reference to the illustrated embodiments.

Although this embodiment describes the case where the present invention is applied to a horizontal two-conductor overhead line, the present invention can be similarly applied to a four-conductor arrangement or the like.

1 and 2 schematically show one embodiment of the damper for overhead lines of the present invention.

A damper 1 is installed between two horizontally arranged overhead wires 2, 3, and is provided with spacers 4, 5, 6 for keeping the distance between the overhead wires 2, 3 constant.

These spacers 4, 5.6 are formed from rigid elongated members, at each end of which clamps 7.7', 8.8' and 9,9' are provided, by means of which the overhead lines 2, It is fixed at 3.

The damper 1 also includes a rod 10 having a length so as to resonate with low frequency vibrations of gear lopping, and eccentric weights 11 and 12 are fixed to both ends of the rod 10.

This rod 10 is provided in a through hole 4a provided approximately in the center of the spacer 4,5.6 in parallel relation to the overhead wires 2,3,
5a and 5a, and is fixed to the spacer 4 at the part where the rod penetrates the central spacer 4,
The other penetrating portions of the rods are free to move relative to the spacers 5,6.

The rod is made of a rigid material such as metal, plastic, rubber, etc., either singly or compositely, and is preferably made of stranded steel wire, which has a high strength against torsional force.

In such a damper 1, during gear lopping, the overhead wires 2 and 3 vibrate at a low frequency in the longitudinal direction of the paper (vertical direction in the installed state) in FIG. Since the rod 10, whose length is set so as to resonate at this vibration frequency, receives rotational force from the eccentric weights 11 and 12 at both ends of the rod 10, which draws a substantially elliptical trajectory within the rod.

Since the rod 10 is fixed to the spacer 4, this rotational force becomes a stress in a direction that twists the rod portion between this fixed portion and the eccentric weights 11, 12.

When this torsional stress acts on the rod 10, torsional stress is generated inside the rod 10, which causes gear roping energy loss.

Therefore, if the length of the rod 10 and the moment of inertia of the eccentric weights 11 and 12 are appropriately set in accordance with the frequency of the overhead line vibration specific to the area where the construction is to be carried out, vibrations due to gear roping can be suppressed.

FIG. 3 shows another embodiment of the present invention, which differs from the previous embodiment in that an energy absorption mechanism is provided between the spacers 5, 6 and the rod 10.

That is, friction plates 13 and 14 are provided at both ends of the rod 10 and rotate together with the rod 10 in the circumferential direction.
By pressing 3.14 against the surfaces of the spacers 5 and 6 with elastic bodies 15 and 16, the surfaces of the spacers 5 and 6 and the friction plate 13°1
4 to cause friction loss.

By providing the friction plate in this manner, more vibration energy can be consumed.

In FIG. 3, the same parts as in FIG. 1 are designated by the same reference numerals, and their explanation will be omitted.

In the embodiment described above, the rod 10 has three spacers 4.5.
However, since the rod 10 may be short for relatively high frequencies, the portion to the left of line A--A in FIG. 1 may be omitted.

Furthermore, since it is necessary to make the rod long for relatively low frequencies, the rod may be supported by four or more spacers.

Furthermore, the eccentric weights 11, 12 may be mounted on the rod 10 at both ends of the rod 10, i.e. on the inside of the spacers 5, 6 rather than on the outside, and the number of eccentric weights may be one, three or more.

Further, the mounting position of the friction plate is not particularly limited.

According to the damper for overhead lines of the present invention, it is possible to not only maintain a constant distance between overhead lines, but also to consume the vibration energy of the overhead lines, thereby effectively preventing gear lopping, and thus short-circuiting the overhead lines. Accidents can be prevented, and offset construction and split towers are not required, so it is economical.

Also, even if the rod has a long length necessary to resonate with low-frequency vibrations, its end passes through one spacer and is supported by this spacer, so the weight of the eccentric weight causes the rod to It does not bend and therefore does not impede gearropping prevention.

[Brief explanation of drawings]

Fig. 1 is a plan view of an embodiment in which the damper of the present invention is applied to a parallel two-conductor overhead line, Fig. 2 is a front view of the damper of Fig. 1, and Fig. 3 is a plan view showing another embodiment of the present invention. It is a diagram. 1... Damper, 2, 3... Overhead line, 4
, 5.6... Spacer, 4 a , 5 a ,
5 a...Through hole, 7.7', 8.8', 9.
9'... Clamp, 10... Rod,
11, 12... Eccentric weight, 13°14...
...Friction plate, 15.16...Elastic body.

Claims (1)

[Scope of utility model registration request] at least two spacers that hold a plurality of overhead wires at a constant interval; one end fixed to the one spacer, the other end penetrating the other spacer and movably supported so as to extend approximately in the line direction of the overhead wires; A damper for an overhead line, comprising a rigid rod positioned in parallel and having a length that resonates with low frequency vibration, and an eccentric weight attached to the rod.