JPS61167318A - Overhead ground wire icing ice preventive device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a method for removing ice and snow adhering to an overhead ground wire connected to a plurality of support towers when ice and snow have formed on the overhead ground wire. This invention relates to an overhead ground wire icing and snow prevention device.

[Prior Art] In cold regions, ice buildup on overhead power transmission lines can cause interphase short circuits or ground faults, and even collapse of steel towers due to wind pressure loads on electric wheels covered with ice and snow.

Conventionally, therefore, current has been forcibly passed through power transmission lines when ice and snow accumulate, raising the temperature of the transmission lines and melting snow using Joule heat. In other words, for power lines, people patrol and find places where ice and snow have formed, for example, 2
In the case of electrical power lines, some methods have been adopted in which a current twice the normal current is forced to flow through one line for a short period of time.

[Problems to be Solved by the Invention] However, the reality is that such ice and snow removal is not performed on ground lines.

This is because the ground wire is connected to the ground potential, so in order to remove ice and snow using the method described above, current must be passed through each span, making the process extremely large-scale. This is because it is actually extremely difficult. Therefore,
Until now, no effective measures have been taken to remove ice and snow from ground lines.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide an overhead ground wire ice and snow prevention device that can eliminate the above-mentioned problems and effectively remove ice and snow adhering to the ground wire.

[Means for Solving the Problems] In the present invention, the overhead ground wire is connected to the support tower via an insulator, and is always connected to the ground. This can be constructed, for example, by supporting a steel tower as a support tower with an insulator having excellent insulation strength and by using appropriate switching means (for example, a circuit breaker).

In this invention, as described above, a switch means is provided at a plurality of locations on the overhead ground wire and is normally closed but is opened when necessary to connect the overhead ground wire to the ground potential at a specific point; A detection means for detecting icing and snow on the ground wire, a power source for supplying power to the overhead ground wire when ice and snow have formed on the overhead ground wire, and a detection signal from the detection means, and the detection signal is provided in advance. A central control unit is provided which provides an output signal to the switch means for opening the switch means of the required interval and provides an output signal to the power supply for driving the power supply when a predetermined value is exceeded.

Detection means for detecting icing and snow on overhead ground wires include, for example, load cells that detect icing and snow based on changes in tension due to the adhesion of icing and snow, and load cells that have a similar structure to the ground wire and that detect icing and snow when icing and snow occur. An ice and snow sampler that generates an electrical signal is used. Preferably, an ITV camera is used in conjunction with these detection means, and it is also possible to connect the ITV camera to a monitor TV to monitor ice and snow with human eyes.

[Operation] In the present invention, when the detection means as described above detects ice and snow, the central control device compares the value of the detection signal from the detection means with a predetermined value, and sets the set value. When crossing the ground, an output signal for opening the switch means is given to the switch means, and an output signal for driving the power supply is given to the power supply, thereby supplying power to the overhead ground wire and removing ice and snow adhering to the overhead ground wire. Melt snow.

[Description of Embodiment] FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram of the embodiment shown in FIG. 1.

Referring to FIG. 1, a plurality of steel towers 1a, 1 as support towers
b, an optical fiber composite overhead ground wire 2 is connected to 1 cnm. The optical fiber composite overhead ground wire 2 is supported by the steel towers 1a, 1b, and 1c via an insulator such as an insulator, and therefore is normally kept floating from the ground potential. However, for each tower 1al 1bl lj, the connection lines 3b, 3c to the ground potential are connected to the optical fiber composite overhead ground wire 2 via a normally closed switch SW. Therefore, for example, if all the other SWs are opened except for one 5W 3b, the optical fiber composite overhead ground wire 2 will be connected to the ground potential at the steel tower 1b. In this embodiment, as will be described, in order to conduct current to the optical fiber composite overhead ground wire at the location where the ice and snow have formed, the steel tower 1a is located near the overhead ground wire where the ice and snow have formed.
, 1b, and 1c, all but one SW are opened, and a current is caused to flow between the power supply and the ground potential.

At the steel tower 1b, a load cell 4 is attached to the optical fiber composite overhead ground wire 2, and an icing and snow sampler 5 is attached to the steel tower 1b. This load cell 4 detects the tension of the overhead ground wire 2, and outputs an electric signal corresponding to fluctuations in the tension of the overhead ground wire 2 caused by the occurrence of ice and snow. In addition, the icing and snow sampler 5 has the same material and structure as the overhead ground wire 112, and is configured so that when icing and snow occurs on the overhead ground wire 2, icing and snow will similarly occur, and It is configured to generate an electrical signal when ice and snow accretion exceeds a certain amount. In addition, in Figure 1,
Although the ice and snow sampler 5 is shown only on the steel tower 1b, it is similarly arranged on the other steel towers 1a and lc.

Further, as shown in FIG. 1, an ITV camera 6 is installed on the steel tower 1G. The ITV camera 6 is provided to monitor ice and snow that has formed on the optical fiber composite overhead ground wire 2, and is connected to a monitor TV (not shown), so that the monitor TV cannot be monitored by a person. This makes it possible to check for ice and snow.

In the embodiment shown in FIG. 1, a load cell 4 and an icing/snow sampler 5 as detection means detect icing/snow, and in order to pass current to the portion of the optical fiber composite overhead ground wire 2 where icing/snow has occurred, a power source is used. 8 and a central control unit 9.

The central control device 9 receives detection signals from the load cell 4 and the ice/snow sampler 5, compares the detection signals with a predetermined value, and determines whether the detection signal from the detection means exceeds the predetermined value. Leaving the SW installed on the tower on the far end side from the power supply side of the part of ground wire 2 where ice and snow have formed, install the other SWs.
W are all closed and an output signal for driving the power supply 8 is given to the power supply 1i8.

In FIG. 1, reference numeral JB indicates an optical fiber connection section, and 18 indicates a terminal device.As will be described later, the terminal device 1LS is connected to S based on a command signal from the central control device 9.
It has the function of outputting a drive signal to open W, and transmitting detection signals from the load cell 4 and the ice/snow sampler 5 to the central controller 9.

Next, with reference to FIG. 2, which is a block diagram of the embodiment shown in FIG. 1, the connection and operation of each component of this embodiment will be explained. In the structure of this embodiment, a three-core optical fiber 11.
2.13 is used as a transmission line. In FIG. 2, connection boxes JB1b I3 and JBlc are provided in the middle of this optical fiber transmission line 11, 12, 13. These connection boxes JBlb and JBIC correspond to the connection boxes provided on the steel towers 1b and 1c in the configuration shown in FIG.

In the connection box JBlb, a terminal device 14 is connected to the transmission line 12 by an optical fiber.

A load cell 4 and an icing sampler 5 are connected to the terminal device 114 via electro-optical converters 15 and 16, respectively. In FIG. 2, all broken lines indicate lines for transmitting optical signals, and solid lines indicate lines for transmitting electrical signals.

On the other hand, the terminal @1f14 also has an electrical-optical converter 17.
A meteorological data detection device 18 is connected via. As the weather data detection device 18, for example, a thermometer, an anemometer, a wind vane, a rain gauge, etc. can be used. However, the meteorological data detection device @18 is provided to confirm the detection of the icing and snow condition in the O-docel 4 and the icing sampler 5 as the icing and snow detecting means,
This is not an essential configuration of this invention.

The terminal device 14 is connected to the load cell 4, the icing sampler 5, and the weather data detection device @18 as described above, and provides detection signals from each detection means to the central control device 9 via the transmission line 12. .

Further, the terminal device 14 itself is connected to a solar cell 19 and is configured to be driven by the solar cell 19. Furthermore, the terminal device 14 includes an optical-to-electrical converter 20.
It is connected to a circuit breaker 21 as an SW in FIG. 1 via. The circuit breaker 21
is normally closed and is configured to be opened based on a drive signal from the terminal device F14.

Similarly, in the connection box JBIC, the terminal device 24
are connected to the transmission line 11 so as to be able to exchange signals. A load cell 26 is connected to the terminal device f24 via an electro-optic converter 25. This is similar to the configuration on the connection part JBlb side. Also,
The terminal equipment @ 24 is connected to an ITV via an optical-to-electrical converter 27.
A camera 6 is connected, which ITV camera 6 is connected to the transmission line 13 via an optical switch 28 .

The ITV camera 6 is driven by a control signal issued by a terminal device 24 based on a command signal from a central control device 9, and is connected to a monitor TV via an optical switch 28 and a transmission line 13.
An image signal is given to 29.

The terminal device 24 has a solar cell 3 similar to the terminal device 114.
1, an optical-to-electrical converter 32, and a circuit breaker 33 are connected.

Transmission lines 11.12 are connected to the central control unit l! 9, while the central control unit 9 is connected to a power source 8 for supplying current to the ground wire. When the detection signal from each terminal device is larger than a predetermined value, the central control device 9
A drive signal is given to the power source 8 to drive the power source 8.

In the embodiment shown in FIG. 2, when ice and snow occur on the τ ground wire on the left side of the connection point indicated by JBlb, the load cell 4 and the ice and snow sampler 5 send a detection signal in response to the ice and snow to the terminal device 14. give. This detection signal is given from the terminal device 14 to the central II control device 9 via the transmission line 12. The central control m' @ station 9 compares the value of the detection signal with a predetermined value, and if the detection signal is large, the terminal device circuit breaker 21 other than the terminal device 14 is
The terminal device other than the terminal device 14 gives a command signal to leave the circuit breaker 21 open and open the other circuit breakers, thereby causing the terminal device other than the terminal device 14 to give a drive signal to the circuit breaker M to open the circuit breaker 21 but leave the circuit breaker 21 open. will be opened. At the same time, the central control unit 9 drives the power supply 8 and therefore the connection JBlb
The more left-hand ground wire portion is electrically connected to the ground potential by the circuit breaker 21, ie, connected to the ground potential at the connection line 3b in FIG. Therefore, in the configuration shown in FIG. 1, a current is applied from the power source 8 to the overhead ground wire 2 on the left side of the portion to which the connection line 3b is connected, and the adhered ice and snow are melted and removed.

In this way, in this embodiment, each steel tower 1a...1
A load cell 4 or an icing sampler 5, etc. as a detection means is placed at G to detect the icing and snow condition, and also to connect the ground potential and the overhead ground wire 2 at each steel tower 1a...1G section. A switch SW is provided, and when ice and snow occur, the switch SW is turned on so as to pass current to the area where ice and snow occur.
By opening W and passing current from the power source 8, snow melting current can be applied as needed, regardless of the original power supply line.

Note that the load cell 4g3 and the icing sampler 5, which serve as icing detection means, do not necessarily have to be installed in each terminal device 114, 24, and only one of them may be provided.

In addition, since the ice and snow conditions can be visually confirmed through the monitor television 29, it is preferable to connect the ITV camera 6 to each terminal device @14.24, but this is not an essential configuration. However, it is also possible to provide the output from the IT camera 6 to the central control unit w9 and use it as a detection signal.

Furthermore, the weather data detection device 18, as mentioned above,
Although it detects the aim and wind speed, it is an essential component of the present invention because it is used to confirm the validity of the detection signal indicating the icing and snow condition detected by the load cell 4, icing sampler 5, etc. I would like to point out that this is not the case.

Furthermore, in the embodiment described above, the transmission lines 11, 12 .
Although an optical fiber is used as No. 13, the present invention can be used for an overhead ground wire other than an optical fiber composite overhead ground wire (OPGW), and in that case, a power line can be used instead of the optical fiber as the transmission line. is also possible.

[Effects of the Invention] As described above, according to the present invention, an overhead structure is configured such that it can be connected to a plurality of support towers in a state where it is electrically floating from the support tower via an insulator. A ground wire, a switch means provided at multiple locations on the overhead ground wire, which is normally closed and opened as necessary to connect to the ground potential at a specific point, and an overhead ground wire. a detection means for detecting icing and snow on the overhead ground wire, a power source for supplying power to the overhead ground wire when ice and snow occurs on the overhead ground wire, and a detection signal from the detection means, the detection signal being predetermined. When the specified value is exceeded, the normally closed switch means is interposed;
In addition, since it is equipped with a central control device that supplies an output signal to the power supply to drive the power supply, it is possible to melt and remove ice and snow that has formed on the ground wire by flowing current only to the necessary parts of the ground wire. .

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an embodiment of the present invention. FIG. 2 is a block diagram of the embodiment shown in FIG. In the figure, 1'a, 1b, and Ic are steel towers as support towers, 2 is an optical fiber composite overhead ground wire, 3b and 3c are connection lines with the ground potential, 4 is a load cell as a detection means, and 5 is a An ice and snow sampler is used as a detection means, 6 is an ITV camera as a detection means, 8 is a power supply, 9 is a central control unit, 21.33 is a circuit breaker, and SW is a switch.

Claims (3)

[Claims] (1) An overhead ground wire that is electrically floating from the support tower via an insulator and connected to multiple support towers, and an overhead ground wire that is installed at multiple locations on the above-mentioned overhead ground wire and is normally closed. , a switch means that is opened when necessary and connects the overhead ground wire to the ground potential only at a specific point; a detection means that detects snow and ice accreting on the overhead ground wire; a power supply for supplying power to the overhead ground wire; and a detection signal from the detection means, and when the detection signal exceeds a predetermined value, an output signal for opening the switch means is sent to the switch. and a central controller for providing an output signal to the power supply to drive the power supply. (2) The overhead ground line icing and snow prevention device according to claim 1, wherein a load cell is used as the detection means. (3) The overhead ground line icing and snow prevention device according to claim 1, wherein an icing sampler is used as the detection means.