JPS6024653B2 - Protection method and device for power transmission line towers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to protection of power transmission line towers during abnormal situations.

Recently, in response to the difficulty in locating power plant sites, the use of power generation ships has been planned or put into practical use.

Overhead power transmission lines, as shown in Figure 1, are used to transmit power from the power generation ship, but when the power generation ship is shaken significantly due to a typhoon or tsunami, the slack of the overhead power transmission lines ) alone cannot absorb the amount of relative displacement between the ship and the land, and there is a risk that excessive wire tension will be applied to the tower, causing the tower to collapse. In other words, both power transmission lines and steel towers have the same safety factor if they comply with the standards, but there are many cases where towers are damaged due to margins and other factors.

Further, from the viewpoint of current capacity, the size of the electric wire becomes large, and if the strength of the electric wire is matched, the steel tower becomes uneconomical in many cases.

In Figure 1, 1 is the land area, 2 is the water surface, 3 is the power generation ship, 4 is the steel tower, 5 is the power transmission line, 6 is the insulator, 7 is the jumper wire, and 8 is the sag.For safety reasons, the sag is 8. cannot be made large.

Therefore, the present invention was made with the focus on the fact that in the event of the above-mentioned abnormality when a power-generating ship is used, it is easier to restore the system by disconnecting the electric wire side first, and there is less damage to related equipment. The present invention provides a method and device for predicting the effects of excessive tension and safely and reliably cutting the glenoid crab part.

In other words, if, for example, the ship is on the left side in Figure 1, the steel tower will also become intrusive, the slack of the wires will be reduced, and excessive tension will be applied to the wires. As a result, as shown in Figure 2, the steel tower 4 with less tolerance
Excessive stress occurs in one of the main pillars. This stress is detected by the load detection device 11 (for example, a resistance wire strain gauge is attached to the main pillar material, or a tension meter is installed as a connecting member), and when this detected signal reaches a preset reference value. 3, an operating output is generated from the output control device 13 shown in FIG.
is activated to separate the insulator 6 from the steel tower 4. It goes without saying that the above reference value set in advance is a value set in consideration of the safety level of the steel tower 4.

In addition, as an example of a device for cutting and holding electric wires, as shown in FIG. It is something that explodes.

Since the long insulator 6'' is weak against heat and shock loads, the electric wire can be separated.

Note that if the jumper part 7 is made of European aluminum stranded wire, the wire will break under a low load, so the entire device will operate reliably.

In addition, as an example of separating the power transmission line from the steel tower, as shown in FIG. 5, there is a connection fitting 15 which has grooves 14 with pin holes at both ends and grooves 16.

The connecting fitting 15 is a replacement for the turtle line cutting device 12 in FIG. 2, and the tensile force that causes the connecting fitting 15 to break is
This corresponds to the tensile force set in consideration of safety. In addition, the connecting fittings shown in FIG. Item 19 can be freely released by hand using a rope, etc., but if it is difficult to do so, use a lever or other appropriate means.
You just need to be able to release it freely with your hands.

In this way, by pulling out the workpiece 19 from the two-part holder 18, the two-part holder 18 can be easily separated. Similar to the connecting fitting 15 in FIG. 5, this connecting fitting is also preferably provided at the same position as the glans cutting device 12 in FIG. 2. In any case, it is important that the tensile force for disconnection remains unchanged over a long period of time in the area where the power transmission line is disconnected from the steel tower, so it is desirable to use corrosion-resistant materials.

As described above, since the present invention disconnects the power transmission line within the limit strength of the steel tower, damage can be kept to a minimum and restoration work is relatively easy, which is extremely effective.

Although the present invention has been described as an example of a transmission line tower connected to a power generation ship, the present invention is not limited thereto, and the present invention is applicable to a landscaping steel tower for lowering CV cables, which is heavy and has a large impact when it collapses. This method can also be applied to steel towers in earthquake-prone areas where there is a risk of the towers leaning due to ground deformation.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a power transmission line from a power generation ship, Figure 2 is an installation diagram of a tower protection device showing an embodiment of the present invention, and Figure 3 is a diagram of a tower protection device showing an embodiment of the present invention. Block Diagram,
FIG. 4 is a front view showing an embodiment of the power transmission line separation device according to the present invention, FIG. 5 is a front view showing another embodiment of the power transmission line separation device, and FIG. FIG. 6 is a plan view showing another embodiment of the device, and FIG. 6 is a front view thereof. The numbers used in the diagram are commonly used: 1 is the land area, 2 is the water surface, 3 is the power generation ship, 4 is the steel tower, 5 is the power line, 6
is the insulator, 6' is the retaining clamp, 6'' is the trunk insulator, 7 is the jumper wire, 8 is the slackness, 10 is the main pillar of the steel tower, 11 is the load detection device, 12 is the flea line cutting device, 13 is the output control device, 1
2 is an explosive element, 15 is a connecting fitting, 16 is a groove, 17 is a ball plate, 18 is a two-part holder, and 19 is a workpiece. Figure 2 Figures 3 Figures 4 Figures Old 5 Figures Outside 6 Figures

Claims (1)

[Claims] 1. Protection of a transmission line tower, characterized by detecting an external force acting on the tower, and releasing the restraint of the transmission line on the tower when the external force reaches a reference value. Method. 2. The method for protecting a power transmission line tower according to claim 1, wherein the external force acting on the tower is determined by detecting strain in the tower member using a resistance wire strain gauge. 3. The method for protecting a power transmission line tower according to claim 1, wherein the external force acting on the power transmission tower is detected by a tension meter inserted at a point where the power transmission line is tied to the tower. 4. The method for protecting a power transmission line tower according to claim 1, 2 or 3, wherein the power transmission line is released from the power transmission line by blowing up the restraint part. 5. A load detection device that detects the force applied to the steel tower, an output control device that generates an operating output when the detection signal of the load detection device reaches a reference value, and a signal sent by the operating output of the output control device. A protection device for a transmission line tower, characterized in that it is equipped with a release means for releasing a restraining portion of an electric wire. 6. The power transmission line tower protection device according to claim 5, wherein the load detection device is a resistance wire strain gauge attached to the tower member. 7. The protection device for a power transmission line tower according to claim 5, wherein the load detection device is a tension meter inserted at a point where the power transmission line is tied to the tower. 8. The power transmission line tower protection device according to claim 5, 6, or 7, wherein the solving means is an explosive element attached to an insulator and detonated by the operating output of the output control device. 9. A protection device for a power transmission line tower, characterized in that a connecting fitting is inserted into the power transmission line's restraint part to the tower to release the restraint when the tension exceeds a standard value. 10 A power transmission line tower, characterized in that a connection fitting with a removable wood material fitted to the outside of a two-part holder that is in close contact with both sides of a wedge plate is inserted into a tie-down part of a power transmission line to the tower. Protective device.