JPH06233436A - Method for preventing snow damage on overhead transmission line - Google Patents

Abstract

PURPOSE:To provide a method for preventing snow damages on an overhead transmission line whereby the range of a snow-damage preventing effect can be increased. CONSTITUTION:A spiral rod 2 having a heater therein in wound spirally around an overhead transmission line 1, and a power-supply feeding part 11 for feeding a power supply to the heater which comprises a generation part 8 and an electricity storage part 9 for storing the electricity generated by the part 8 is mounted on the overhead transmission line 1, and further, ice and snow coating of the overhead transmission line 1 are prevented by the heat generation of the heater.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snow damage preventing method for an overhead power transmission line, and more particularly to a snow damage preventing method for an overhead power transmission line which can increase the range of the snow damage preventing effect.

[0002]

2. Description of the Related Art In overhead power lines, snow is attached or snow is frozen during snowfall. This is called snow accretion, ice accretion or ice accretion. This snow accretion does not fall from the overhead power transmission line, but it may grow around the overhead power transmission line while growing, forming tube snow. When snow accretion or tube snow occurs, the weight thereof is added to the overhead power transmission line, so that the overhead power transmission line is broken or, in the worst case, the tower is collapsed.

Several methods have been attempted or proposed in order to prevent snow damage on such overhead power transmission lines.

For example, there is a method in which a ring is attached to an overhead power transmission line or a fin-shaped projection is formed on the overhead power transmission line to prevent rotation of snow accretion and prevent formation of snow cylinders.

Further, in order to melt snow, a magnetic body is attached to an overhead power transmission line and heat generated by hysteresis loss is used, or a current transformer for extracting inductive power from the overhead power transmission line is used as a power source. There is also a method in which a heater that generates heat is wound around the overhead power transmission line.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
Each has its problems.

The method of attaching a ring to the overhead power transmission line or forming the fin-shaped projections on the overhead power transmission line is not effective for all types of snow. Also, no effect can be expected for icing.

The method of attaching the magnetic body to the overhead power transmission line is as follows:
The fever is insufficient and it is not practical to use this method.

The method of winding the heater around the overhead power line is as follows.
In order to prevent snow damage over a long span, the length of the heater becomes long. A large amount of electric power is required to supply a long heater with a sufficient heat generation power source for snow melting. The current transformer cannot take out such a large electric power. The method in which the current transformer is used as the power source for heat generation and the heater is wound around the overhead power transmission line is effective only for a length of several meters at most.

Therefore, an object of the present invention is to solve the above problems and to provide a snow damage preventing method for an overhead power transmission line, which can increase the range of the snow damage preventing effect.

[0011]

In order to achieve the above object, the present invention has a power supply section for spirally winding a spiral rod having an internal heater around an overhead power transmission line, and a power supply section for supplying power to the heater. And a power storage unit that stores the electricity, and is attached to the overhead power transmission line to prevent the frost and snow from accumulating on the overhead power transmission line due to the heat generated by the heater.

The power generation section has a solar cell and a current transformer for extracting inductive power from the overhead power transmission line.

The power supply section is provided with a control section for controlling the energization of the heater, and the control section has a thermostat for turning on and off the switch depending on the temperature and a receiving switch for receiving and operating a remote control signal from the ground. Then, the heater is energized from the power generation unit and the power storage unit via these switches.

The heater is made of copper or a copper alloy and exhibits a low resistance value over a long length.

[0015]

With the above structure, since the spiral rod spirally wound around the overhead power transmission line has a built-in heater, the heater is heated by energizing the heater, and this heat is overhead transmitted through the rod. By propagating to the electric wire, it is possible to remove or prevent icing snow from occurring. Since electricity is supplied to the heater from both the power generation unit and the power storage unit, sufficient electric power can be supplied over a long length.

If the power generation section is composed of a solar cell and a current transformer for extracting inductive power from the overhead power transmission line, the amount of power generation increases, so that sufficient power can be supplied over a longer length. It is also possible to generate power with a solar cell while the sun is shining and charge the power storage unit with this to prepare for energization at night.

Further, since the control unit controls the energization of the heater as necessary, the power generation unit can be charged from the power generation unit while the energization is not required.

If the control unit is composed of a thermostat that switches on and off according to the temperature and a receiving switch that operates by receiving a remote control signal from the ground, energization can be automatically controlled according to the temperature. . If desired, the energization can be controlled by remote control.

If the heater is made of copper or copper alloy so that the heater exhibits a low resistance value over a long length, a current can be applied over a long length without burdening the power generation section. You can flush a lot.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, the overhead power transmission line 1 is provided with a spiral rod 2 with a heater on the outer periphery thereof along the line axis direction. Spiral rod 2
A linear body containing a heater (not shown) is spirally wound around the overhead power transmission line 1 along the axis. Therefore,
Like the spiral rod 2, the heater is also spirally wound around the overhead power transmission line 1. The pitch of the spiral rod 2 is formed to be equal to the pitch of a normal wind noise preventing spiral rod. The heater is made of copper wire and has a small resistance value per length.

To supply power to this heater, a power supply unit 11 including a power generation unit 8, a power storage unit 9, and a control unit 10 is provided at one end of the spiral rod 2. The power generation unit 8, the power storage unit 9, and the control unit 10 are attached to the overhead power transmission line.

The power generation section 8 is for generating power for heating the heater, and is composed of a solar cell 6 and a current transformer 7. The current transformer 7 extracts induced power from the transmission current of the overhead power transmission line 1. The solar cell 6 is attached to the battery 5 described later.

The power storage unit 9 has a function of storing electricity generated by the power generation unit 8 and a function of energizing the heater together with the power generation unit 8. Power storage unit 9 is composed of rechargeable battery 5. The battery 5 is attached to the overhead power transmission line 1 by a fixture 11. Also, this battery 5
The solar cell 6 is attached to the surface of the. The current transformer 7 and the solar cell 6 are connected to the battery 5 so that they can be charged from both sides.

The control unit 10 is composed of a control device 3 attached to the overhead power transmission line 1 by an attachment 12 and an antenna 4 provided in the control device 3. The control device 3 has a built-in thermostat that switches on and off according to the temperature and a reception switch that operates by receiving a remote control signal from the ground (both not shown). The antenna 4 can receive a remote control signal by radio waves and transmit it to the reception switch. In the control device 3, the heater and the battery 5 are connected via a thermostat and a receiving switch. The power generation unit 8 and the power storage unit 9 are configured to be able to energize the heater via the control unit 10.

In the control device 3, if the thermostat and the receiving switch are in parallel, automatic switching by temperature and remote operation can be performed independently. If the thermostat and the receiving switch are in series, it becomes possible to energize when automatic switching due to temperature and remote operation overlap.

When there is snow on the overhead power transmission line 1 due to snowfall in winter, or when there is a possibility of such snowfall, an automatic monitoring device or a person on the ground wirelessly activates the reception switch. A current flows through the heater due to the operation of the reception switch. Electricity is supplied to the heater from both the power generation unit 8 and the power storage unit 9,
Moreover, since the heater exhibits a low resistance value over a long length, it is possible to supply sufficient electric power over a long length. Therefore,
The temperature of the heater rises, and this heat is propagated to the overhead power transmission line 1 via the spiral rod 2. The temperature of the overhead power transmission line 1 rises, and snow accretion on the overhead power transmission line 1 is melted. Of course, if the temperature rises before snowfall occurs, snowfall can be prevented in advance. The thermostat may be turned off before the temperature of the overhead power transmission line 1 rises more than necessary.

During the daytime, the battery 5, the solar cell 6, and the current transformer 7 can be energized. At night, electricity is supplied from the battery 5 and the current transformer 7. Further, the battery 5 can be charged from both the solar cell 6 and the current transformer 7 without the need for energization.

Since it is difficult for the heater to generate sufficient heat only with the current transformer 7, the energization time of the heater depends on the capacity of the battery 5. For example, considering the snowfall time in Tokyo, the capacity of the battery 5 is set so that the energization can be continued for at least 10 hours.

[0030]

The present invention exhibits the following excellent effects.

(1) Since the heater is energized from both the power generation unit and the power storage unit, sufficient electric power can be obtained and snow damage to the overhead power transmission line can be prevented over a long span.

(2) The spiral rod, the power generation unit, the power storage unit, and the control unit may be installed once and then left as they are, and there is no need to remove them in summer and replace the battery, which is simple.

(3) Since the heater is built in the spiral rod and the spiral rod is spirally wound around the overhead power transmission line, it is also effective in preventing wind noise.

(4) Since remote control from the ground is possible,
The operation can be started in any situation, and flexible operation becomes possible.

[Brief description of drawings]

FIG. 1 is a partial side view of an overhead power transmission line showing an embodiment of the present invention.

[Explanation of symbols]

 1 Overhead Transmission Line 2 Spiral Rod 6 Solar Cell 7 Current Transformer 8 Power Generation Section 9 Power Storage Section 10 Control Section 11 Power Supply Section

Claims (4)

[Claims] 1. An overhead power transmission line comprising a spiral rod having a heater inside, which is spirally wound around an overhead power transmission line, and a power supply unit for supplying power to the heater is composed of a power generation unit and a power storage unit for storing the electricity. A method for preventing snow damage to an overhead power transmission line, which comprises mounting and preventing heat from a heater to prevent ice from accumulating on the overhead power transmission line. 2. The method for preventing snow damage to an overhead power transmission line according to claim 1, wherein the power generation unit includes a solar cell and a current transformer that extracts inductive power from the overhead power transmission line. 3. The power supply unit is provided with a control unit for controlling energization of a heater, and the control unit includes a thermostat for turning on and off the switch according to temperature and a receiving switch for receiving a remote control signal from the ground to operate. The method for preventing snow damage to an overhead power transmission line according to claim 1, wherein the heater is energized from the power generation unit and the power storage unit via these switches. 4. The snow damage prevention method for an overhead power transmission line according to claim 1, wherein the heater is made of copper or a copper alloy and exhibits a low resistance value over a long length.