JPH06300737A - Discharging apparatus for overhead-wire running machine - Google Patents

Abstract

PURPOSE:To discharge a voltage induced in an overhead-wire running machine to an overhead wire by a small discharging current. CONSTITUTION:A conductive roller 25 brings a conductive ring 29 mounted on, and attached to, a roller shaft 26 via an insulating ring 28 into contact with an overhead wire 2 by the tractive force of a coil spring 35. A fixed conductive ring 31 which is brought into edge sliding contact with the conductive ring 29 is connected to a resistor 37 for discharging via a lead wire 36, and the resistor 37 is attached so as to come into electric contact with a running- machine body 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead line inspection device that runs on an overhead line to detect flaws on the overhead line, and a discharge of an airborne vehicle that runs on the overhead line to perform maintenance on the overhead line. Regarding the device.

[0002]

2. Description of the Related Art For example, overhead power transmission lines such as ACSR are often laid through mountainous areas, and are frequently damaged by lightning. The degree of the damage varies from slight to the extent that the wire cannot be left as it is, for example, a part of the wire is broken. The breakage of the wires forming the overhead wire may cause corona discharge, and may reduce the tensile strength of the overhead wire, resulting in breakage or the like. Therefore, conventionally, an inspection apparatus has been developed which automatically detects flaws in the overhead wire over the entire length (Japanese Patent Laid-Open Nos. 64-73248 and 63-2341).
No. 49).

By the way, an overhead wire inspection device has a structure in which wheels run on the overhead wire, and the wheels are usually made of rubber or other insulating material in order to increase the adhesiveness with the overhead wire. For this reason, since the overhead wire inspection device cannot be grounded via the overhead wire, the inspection device body is electrostatically induced by the adjacent overhead wire, and its potential becomes high. On the other hand, this type of inspection apparatus is equipped with various electric circuits, and if the electric potential of the apparatus main body becomes high, this electric circuit is adversely affected and causes a failure or the like.

As a countermeasure, conventionally, wheels for traveling are formed of conductive rubber, or a mechanism for electrically contacting an overhead wire with the main body of the apparatus is provided, and an induced voltage induced in the main body of the apparatus is passed through the overhead wire. Is being discharged.

5 and 6 show side views of such a contact mechanism. In FIG. 5, the leaf spring 1 is attached to a part of the apparatus main body 10 so that the leaf spring 1 is always in contact with the upper surface of the overhead wire 2. Further, in FIG. 6, the slide shaft 10a is attached to the apparatus main body 10, and the spring 10b is sandwiched so as to push down the slide shaft 10a, while the slide shaft 10a is inserted.
A conductive roller 9 is attached to the lower end of the via a leaf spring 8. The electrically conductive roller 9 is constantly pressed against the overhead wire 2 by the force of the spring 10b with an appropriate pressure, whereby the apparatus body 10 is electrically connected to the overhead wire 2.

[0006]

However, since dust adheres to the surface of the overhead wire or an oxide film is formed on the surface of the overhead wire, which forms an insulating layer, the leaf spring or the conductive roller is simply contacted with the overhead wire. Even if it is done, the induced voltage of the apparatus main body may be discharged only intermittently. For this reason, the discharge current becomes large, which may adversely affect the electric circuit as described above.

The present invention has been made to solve the above-mentioned problems, and is directed to an overhead line traveling machine capable of discharging while suppressing the voltage induced in the traveling machine body of the overhead line traveling machine to a small discharge current. An object is to provide a discharge device.

[0008]

A discharge device for an overhead wire traveling machine according to the present invention is mounted on a traveling machine main body, is in contact with an overhead wire, and is a conductive roller that rolls during traveling of the overhead wire traveling machine, It is characterized by including a discharging resistor connected between the conductive roller and the main body of the traveling machine.

[0009]

The voltage induced in the main body of the traveling machine is applied to the conductive roller through the discharging resistor and discharged by the overhead wire.
Therefore, since the discharge current can be suppressed and the discharge current can be suppressed, the adverse effect on the electric circuit can be prevented.

[0010]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 3 is a side view showing an embodiment in which the discharge device of the present invention is applied to an overhead line inspection device, and FIG. 4 is a front view thereof.
The overhead line inspection device shown in FIG. 3 and FIG.
Front and rear wheels 20 are provided to support 0 on the overhead line 2 and to roll while contacting the overhead line 2. These wheels 20 are frame plates 19 and 19 fixed to a frame 11 described later.
Is rotatably mounted on.

As shown in FIG. 4, a deep groove 21 is formed in the center of the wheel 20, and a shallow groove 22 is formed around the deep groove 21. The distance between the wheels 20, 20 is preferably set larger than the length of the obstacle so that both the wheels 20, 20 do not roll on the obstacle at the same time.

The apparatus main body 10 includes a frame 11, a coil mounting frame 12 provided on the upper portion of the frame, a control circuit box 13 suspended at the lower portion, and a frame on the open side of the frame 11 (on the left side in FIG. 4). And a fall prevention wire 14 that binds the upper and lower sides of the. A drive motor 17 that drives the wheels 20 via a chain 16a is attached to the front surface of the frame 11. Further, an obstacle sensor 15 for detecting an obstacle such as a damper attached to the overhead wire 2 is provided at the center of the frame 11. When the obstacle sensor 15 detects an obstacle, the obstacle sensor 15 sends a detection signal to the control circuit in the control circuit box 13 so that the coil mounting frame 12 having a left-right split structure is opened leftward and rightward to retract. .

As shown in FIG. 3, the wheels 20 at the front and rear of the device are configured to be simultaneously driven with each other via a chain 16b. Further, a camera 18b is attached so as to cover the overhead line 2 from above, and a camera 18b supported and fixed below the overhead line 2 photographs the overhead line 2 and the rear surface of the overhead line 2 projected on the mirror 18. Is configured to. While the vehicle 20 is traveling, the rotation speed of the wheel 20 is controlled by the control circuit box 13
Coil mounting frame 1 counted by the control circuit inside
When the flaw detection coil in 2 detects damage to the overhead wire or breaks in the strands, the control circuit calculates at which position on the overhead wire the scratch is present by the wheel rotation speed and records the result. The camera 18b is operated and controlled so as to take a picture of a damaged state or a broken wire.

As shown in FIGS. 3 and 4, the overhead line inspection device having the above-described structure has the discharge device 2 in front of the traveling direction.
3 is attached. That is, the discharge device 23 is fixed to the frame plate 19 and attached to the mounting plate 24 protruding forward in the traveling direction.

FIG. 1 is an enlarged sectional view of the discharge device 23. The discharge device 23 includes a conductive roller 25. The conductive roller 25 is rotatably attached to the center of a roller shaft 26 via ceramic bearings 27, 27, and a conductive ring fitted on the insulating ring 28 and fixed by screws. 29 and roller shaft 2
6 has an insulating ring 30 movably fitted in the square bar portion 26a at the tip end of 6 through a square hole, and a fixed conductive ring 31 fitted on the insulating ring 30 and fixed by screws. ing. A bolt portion 26b projects from the square rod portion 26a of the roller shaft 26, and a leaf spring 32 is attached to the bolt portion 26b and a tightening nut 33 is screwed.
Therefore, the insulating ring 30 is always pressed by the leaf spring 32 toward the other insulating ring 28, so that one end surface of the fixed conductive ring 31 is pressed against the facing end surface of the conductive ring 29.

A roller arm 34 is provided on the base side of the roller shaft 26.
It is fixed by penetrating to the tip of. The roller arm 34 is rotatably supported by the mounting plate 24. The base of the roller shaft 26 is supported by one end of the coil spring 35, and the other end of the coil spring 35 is fixed above the mounting plate 24. The coil spring 35 applies a pulling force to the roller shaft 26 in the radial direction to rotate the roller arm 34, so that the conductive ring 29 of the conductive roller 25 is connected to the overhead wire 2.
Are pressed against. Since the conductive ring 29 and the fixed conductive ring 31 are mounted on the roller shaft 26 via the insulating rings 28 and 30, as described above, the conductive roller 25 must be mounted while being reliably insulated from the apparatus body 10. become.

One end of a lead wire 36 is connected and fixed to the screw fixing the fixed conductive ring 31. A discharge resistor 37 is connected to the other end of the lead wire 36. The discharging resistor 37 is electrically connected and fixed to the frame side of the device body 10. FIG. 2 is an equivalent circuit showing the relationship between the discharge device 23, the device body 10 and the overhead wire 2 described above. In FIG. 2, 3 indicates a power transmission line,
C ₁ indicates the capacitance generated between the power transmission line 3 and the device body 10, and C ₂ indicates the capacitance between the device body 10 and the overhead wire 2 (GW).

Next, the operation of the discharge device 23 of the present invention will be described. When the overhead wire inspection device runs on the overhead wire 2, the conductive roller 25 rolls because it is pressed against the overhead wire 2. Dust may have adhered to the overhead wire 2 during this run,
When an oxide film is formed or the conductive roller 25 is brought into a non-contact state with the overhead line 2 due to vibration, the power transmission line 3
When (see FIG. 2) is held in a hot line state, a large induced voltage is generated in the apparatus body 10 due to the electrostatic capacitance C ₁ .
Therefore, a discharge is generated between the device body 10 and the overhead wire 2. That is, the discharge current is the device body 10 and the discharge resistor 3
7, lead wire 36, fixed conductive ring 3 of conductive roller 25
1 and the route of the conductive ring 29, and is discharged to the overhead line 2. In this embodiment, since the discharging resistor 37 is inserted, the discharging current can be suppressed small.

Therefore, even if the power transmission line 3 is in a live state, the control circuit in the control circuit box 13 can be operated normally and the flaw detection operation can be accurately performed. In addition, although the discharge device 23 of the present invention is applied to the overhead wire inspection device in the above-described embodiments, it is also applied to an aerial vehicle for maintenance and inspection of the overhead wire and a wire drawing device for extending the overhead wire. be able to.

[0020]

As described above, according to the present invention,
Since the conductive roller attached to the main body of the traveling machine is brought into contact with the overhead wire to roll it, and a discharging resistor for suppressing the discharge current is connected between the main body of the traveling machine and the conductive roller, the discharge current is suppressed. As a result, it is possible to reduce the influence on the electric circuit of the overhead line traveling machine even if the power transmission line or the like is in a live state.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of a discharge device according to the present invention.

FIG. 2 is an equivalent circuit showing the relationship between the discharge device of the present invention and the device body or the like.

FIG. 3 is a side view of an overhead wire inspection device including the discharge device of the present invention.

FIG. 4 is a front view of the overhead line inspection apparatus.

FIG. 5 is a view showing a conventional contact mechanism between an apparatus body and an overhead wire.

FIG. 6 is a view showing another conventional contact mechanism between the apparatus main body and the overhead wire.

[Explanation of symbols]

 2 Overhead wire 10 Device main body 13 Control circuit box 23 Discharge device 25 Conductive roller 37 Resistor for discharge

Claims (1)

[Claims] 1. An overhead wire traveling machine that travels on an overhead wire, a conductive roller that is attached to a traveling machine body of the overhead wire traveling machine, abuts against the overhead wire, and rolls when the overhead wire traveling machine travels. And a discharge resistor connected between the conductive roller and the main body of the traveling machine, a discharging device for an overhead line traveling machine.