JP2000304798A - Device for displaying damage of electric line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for displaying damage of electric line capable of accurately displaying whether damage to a transmission line due to lightening has occurred or not without the need for an operating power source. SOLUTION: The charging means of a control means 3 is charged with a voltage generated by a voltage generating means 1 on the basis of a lightening current which flows by lightening. By the activation of a damage detecting means 2 in the case that a lightening with a long waveform duration which damages transmission lines, a display means 4 is driven by a voltage charged in the charging means of the control means 3. As a voltage obtained on the basis of a lightening current is used as an operating power source, there is no need for providing a power source.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire damage indicator for indicating whether or not a transmission line has been damaged by a lightning strike.

[0002]

2. Description of the Related Art It is known that a lightning strike on a transmission line may cause damage such as a broken wire on an overhead ground wire at a lightning strike location. If such wire damage occurs, if left as it is, the load on other wires will increase and the wire will break, leading not only to a ground fault or short circuit accident, but also to a change in tension between the tower diameters and Secondary disaster may occur due to electric wires hanging down due to disconnection. Therefore, conventionally, a method of detecting damage to the transmission line by a patrol of the transmission line by a helicopter or a self-propelled machine operated by radio control has been adopted. Helicopter patrols attempt to spot damaged transmission lines by visually inspecting the transmission lines and videotaping them from above the helicopter. The self-propelled machine method uses a radio-controlled operation of a self-propelled machine equipped with a video camera to self-propell on wires between steel towers, and visually inspects the video image to find damaged parts of the transmission line. It is.

[0003]

In such a method using a helicopter patrol and a self-propelled aircraft, it is necessary to perform a detailed visual inspection of the transmission line over a long distance when it is determined whether or not the transmission line has been damaged by lightning. As a result, there is a problem that not only is it not easy to find damage to the transmission line, but also it takes a long time to find damage.

The present invention has been made based on the above-mentioned viewpoint, and an object thereof is to accurately display whether or not a power transmission line has been damaged by a lightning strike. An object of the present invention is to provide an easy wire damage indicator.

[0005]

According to the present invention, there is provided an indicator for indicating whether or not a transmission line has been damaged by a lightning strike, wherein a voltage is generated based on a lightning current flowing by the lightning strike on the transmission line. Voltage generating means, damage detecting means that is activated when the power line receives a lightning strike having a long waveform duration that damages the power line, and charging means charged by the voltage generating means, The above object is achieved by an electric wire damage indicator having control means for outputting a charging voltage of the charging means by operation of the detecting means, and display means driven by the output of the control means.

According to such a configuration, when a lightning strike occurs on the transmission line, the voltage generating means generates a voltage based on the lightning current flowing thereby, and the charging means of the control means is charged with this voltage. Then, when the lightning strike has a long waveform duration that damages the transmission line, the damage detection means operates, and the display means is driven by the voltage charged in the charging means. Damaging the transmission line is a high-energy lightning, that is, a lightning with a large amount of charge given by the product of the lightning current and its duration. Even if the peak value of the lightning current is high, if the waveform duration is short, the charge amount does not increase, so that no damage is caused to the transmission line. On the other hand, when the waveform duration is long even when the peak value is low as well as when the peak value is high, the charge amount increases,
Damage to the transmission line, such as wire erosion or wire breakage. In the present invention, the damage detection means is activated and the display means is driven in the case of such a lightning strike having a long waveform duration that damages the transmission line, so that it is possible to accurately indicate that the transmission line has been damaged by the lightning strike. can do. Moreover,
Since a voltage obtained based on the lightning current is used as an operation power supply, there is no need to provide a power supply.

[0007]

FIG. 1 is a structural view showing an example of an embodiment of the present invention, and FIG. 2 is a front view of the structure of FIG.

In the drawing, 1 is an induction coil as voltage generating means, 2 is a reed switch as damage detecting means,
Reference numeral 3 denotes control means, and 4 denotes display means.

The induction coil 1, the reed switch 2 and the control means 3 are housed in a main body case 5 made of resin.
The main body case 5 is joined to a main body member 8 having a protruding cylindrical portion 6 on one surface and a storage recess 7 formed on the other surface, and to the other surface of the main body member 8 to close the storage recess 7. And a back plate member 9. The cylindrical portion 6 of the main body member 8 has an open free end surface, and the control means 3 is accommodated therein. The induction coil 1 and the reed switch 2
It is stored in the storage recess 7 closed by the back plate member 9. Such a main body case 5 is fixed such that the outer surface of the back plate member 9 is in close contact with the main column member 10 of the power transmission tower with the outer surface of the back plate member 9 as a mounting surface.

In this embodiment, the induction coil 1 is wound around an air-core rectangular bobbin 11 and is housed in a housing recess 7 of a main body case 5 so as to generate a voltage by a lightning current flowing through a main pillar 10 of a steel tower. ing. Needless to say, a magnetic core can be provided on the square bobbin 11 as needed. As shown in FIG. 2, the reed switch 2 is provided apart from the induction coil 1 so as not to be affected by a magnetic field from the induction coil 1, and receives a magnetic field generated by a lightning current flowing through the main pillar 10 of the tower. As described above, is housed in the housing recess 7 of the main body case 5. The reed switch 2 is used when a lightning strike with a long waveform duration that damages the power transmission line is performed.
It is configured to close in response to a magnetic field generated by a lightning current flowing to zero. The transmission line has a charge of 20
If the temperature exceeds -30 coulombs, the wire will be damaged, and if the electric charge is further increased, the wire will be melted.
The reed switch 2 is configured to be turned on by a magnetic field generated by a lightning current having a waveform duration that gives a Coulomb charge. As is common in summer lightning, even when the peak value is high, the waveform duration of the lightning current is several tens to several hundreds of microseconds.
In this case, since the waveform duration is extremely short, the charge amount is 20 coulombs or less, and the transmission line is not damaged. In such a case, since the waveform duration of the lightning current is short, it is not possible to respond to the magnetic field generated thereby, and the reed switch 2 is not turned on. On the other hand, as seen in winter lightning, the wave duration of the lightning current is several tens of seconds, despite the peak value being as low as several tenths of the peak value often seen in summer lightning. If the length is extremely long, for example, up to several hundred msec, the electric charge becomes a large value of 20 to 30 coulombs or more, and wire damage and wire fusing occur in the transmission line. In such a case, the duration of the lightning current waveform is long, so that the reed switch 2 is turned on in response to the magnetic field generated thereby.

The control means 3 charges a capacitor 22 described later with the voltage generated in the induction coil 1 and
Is closed, the charging voltage is output to the display means 4. Such a control means 3 has a configuration as shown in FIG.

FIG. 3 is a circuit diagram showing an example of the control means 3 of FIG. 1. The control means 3 includes a first protection circuit 12, a rectification circuit 13, a charging circuit 14 as charging means, and a second protection circuit 15. . The first protection circuit 12 has a parallel connection of a bipolar diode 16 for overvoltage prevention and a surge absorbing element 17 such as a varistor. The first protection circuit 12 inputs a voltage generated in the induction coil 1 and supplies the voltage to the rectifier circuit 13. There are positive and negative types of lightning, but in any case, the peak value is suppressed by the bipolar diode 16 and the overvoltage is prevented from flowing into the subsequent circuit, The surge absorbing element 17 prevents the surge from flowing into the subsequent circuit. The rectifier circuit 13 is a bridge rectifier circuit including four diodes 18, 19, 20, and 21, and supplies a rectified voltage to the charging circuit 14. Charging circuit 14
Has a parallel connection of a capacitor 22 to which a rectified voltage is supplied from the rectifier circuit 14 and a resistor 23, one output terminal of which is connected to one end of a solenoid 35 of the display means 4, and the other output terminal of which is connected to The reed switch 2 is connected to one end. The other end of the reed switch 2 is connected to the other end of the solenoid 35 of the display means 4. The second protection circuit 15 has a surge absorbing element 24 such as a varistor connected in parallel to the reed switch 2 to prevent a surge from flowing into a subsequent circuit. When a voltage is generated in the induction coil 1, the control means 3 charges the capacitor 22 of the charging circuit 14 via the first protection circuit 12 and the rectification circuit 13 according to the time constant of the resistor 23. If the reed switch 2 does not turn on because the lightning current waveform duration is short, the capacitor 2
The charging voltage of 2 discharges through the resistor 23. On the other hand, if the waveform duration of the lightning current is long enough to damage the transmission line, the charging voltage of the capacitor 22 is applied to the solenoid 35 of the display means 4 by turning on the reed switch 2.

The display means 4 includes a cylindrical display case 26 having one end open, a display cover 27 for closing the open end of the display case 26, and a driving means for opening the display cover 27. 28.

The display case 26 has a bottom 26a, and the bottom 26a is fixed to the free end surface of the cylindrical portion 6 of the main body case 5. A cylinder member 29 protrudes from the bottom 26a at the center of the display case 26. An annular case permanent magnet 30 is provided on the inner periphery of the free end of the cylinder member 29. A piston 3 (to be described later) of the driving means 28 is provided inside the member 29.
9 are slidably housed. An engagement cylindrical member 31 engaged to receive a free end portion of the cylinder member 29 of the display unit case 26 is provided at a central portion of the inner surface of the display unit cover 27.
An annular lid permanent magnet 32 is provided on the engagement cylindrical member 31 so as to correspond to the case permanent magnet 30 of the cylinder member 29. The case permanent magnet 30 and the cover permanent magnet 32 are magnetized so as to be attracted to each other, and the display unit cover 27 closes the display unit case 26 by the magnetic attraction force of both. The display unit case 26 further houses a display body 33. The display body 33 includes a coil-shaped display spring 33a, one end of which is fixed to the display unit case 26 and the other end of which is a free end, and a display such as a red color provided to cover the wire surface of the display spring 33a. And a cloth 33b. The display body 33 is housed around the cylinder member 29 and urges the display unit cover body 27 in the opening direction. The urging force of the display body 33 is much weaker than the magnetic attraction force between the case permanent magnet 30 and the lid permanent magnet 32. Therefore, the display unit cover 27 is not opened by the urging force of the display body 33. .
The display cover 27 is connected to the display case 2 via a chain 34.
6.

The driving means 28 includes a solenoid 35 excited by the control means 3, a plunger 36 movably held by the solenoid 35, and a plunger biasing spring 37 for biasing the plunger 36 in a direction protruding from the solenoid 35. And a plunger attracting magnet 38 that attracts the plunger 36 in the most retracted state against the urging force of the plunger urging spring 37, and engages with the plunger 36 to push the display unit cover 27 outward by projecting the plunger 36. And a projecting piston 39. The solenoid 35 is held on the outer end surface of the bottom 26 a of the display case 26 so as to be stored in the cylindrical portion 6 of the main body case 5. The plunger 36 is connected to the piston 3 in the cylinder member 29 through an opening 40 formed in the bottom 26a of the display case 26.
9 is engaged. The piston 39 has the inner peripheral surface of the case permanent magnet 30 and the inner peripheral surface of the cylinder member 29 as sliding surfaces, and the plunger 36 protrudes from the solenoid 35 to push the front cover 27 outward. Has become. When the solenoid 35 is excited by the control unit 3, the driving unit 28 cancels the magnetic force of the plunger attracting magnet 38, and causes the plunger 36 to project together with the urging force of the plunger urging spring 37. Thus, the piston 39 is moved to open the display cover 27 as shown in FIG. FIG. 4 is a view showing a state in which the display means 4 is operated.

FIG. 5 is a diagram for explaining the operation of the electric wire damage indicator having the structure shown in FIG. 1. 50 is an electric wire damage indicator described in FIG. 1, 51 is a power transmission line tower, and 52 is an overhead ground wire of the transmission line. . Hereinafter, the operation of the configuration of FIG. 1 will be described with reference to FIG.

The electric wire damage indicator 50 is a main pillar 1 of the steel tower 51.
0 as described above. Wire damage indicator 50
Is attached, for example, if a lightning strike S occurs on the overhead ground wire 52, the lightning current Is flows on the overhead ground wire 52 and also shunts to the steel tower 51, and the shunted lightning current Is1 is transmitted to the wire damage indicator 50. Flows to the ground through the fixed main pillar 10. When the lightning current Is1 flows through the main pillar member 10, a voltage is generated in the induction coil 1 of the electric wire damage indicator 50, whereby the capacitor 22 of the control means 3 is charged. If the waveform duration of the lightning current Is due to the lightning strike S is long enough to damage the overhead ground wire 52, the tower 51
Similarly, the lightning current Is1 flowing through the main pillar 10 has a longer waveform duration, so that the reed switch 2 is closed in response to the magnetic field generated thereby, and the charging voltage of the capacitor 22 is applied to the solenoid 35 of the display means 4. Given. Thereby, the plunger 36 of the display means 4 protrudes from the solenoid 35, and the display unit cover 27 is pushed outward by the piston 39 against the magnetic attraction force of the case permanent magnet 30 and the cover permanent magnet 32. In combination with the urging force of the display 33, as shown in FIG. 4, the display unit cover 27 is opened to expose the display 33, and damage to the transmission line is displayed.

Since the resistance value of the tower in the transmission line is ten times or more larger than that of the overhead ground wire, the lightning current shunted to each tower is greatly attenuated. Therefore, the lightning current shunted to the tower nearer to the lightning strike location becomes larger, and the lightning current becomes smaller as the farther to the tower, the electric wire damage indicator 50 provided on the tower 51 nearer to the lightning strike operates, and the lightning strike location is identified. can do.

On the other hand, when the duration of the lightning current Is caused by the lightning strike S is short and the overhead ground wire 52 is not damaged,
The reed switch 2 is not turned on, and the electric charge charged in the capacitor 22 is discharged through the resistor 23.

When the display means 4 is reset, the plunger 36 is attracted by the plunger attracting magnet 38 when the piston 39 is depressed.
Then, the display 33 may be stored in the display case 26 and closed with the display cover 27. Since the display cover 27 is coupled to the display case 26 by magnetic attraction,
The display case 26 can be closed very easily.

[0021]

As described above, according to the present invention, a lightning strike having a long waveform duration, which charges a charging means with a voltage generated by a voltage generating means based on a lightning current flowing due to a lightning strike and damages a transmission line. When the damage detecting means is activated when there is, the display means is driven by the voltage charged in the charging means, so that it is possible to accurately display the damage of the transmission line due to lightning strike, and Since an operating power supply is unnecessary, an electric wire damage indicator which is extremely easy to maintain can be provided.

Further, since the voltage generating means and the damage detecting means are provided so as to operate by the lightning current flowing in the tower of the transmission line, it is possible to provide an electric wire damage indicator which makes it easy to identify a lightning strike location.

Further, since the plunger and the piston are driven by the solenoid excited by the voltage of the charging means to indicate the electric wire damage, after the display operation is performed, there is no need to replace any parts and reuse. In addition, since the display case and the display cover are connected using the magnetic attraction force, the display unit can be reset very easily.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an example of an embodiment of the present invention.

FIG. 2 is a front view of the configuration of FIG. 1 viewed from the direction of arrow A.

FIG. 3 is a circuit diagram illustrating an example of a control unit of FIG. 1;

FIG. 4 is a view showing a state in which the display means of FIG. 1 is operated.

FIG. 5 is an operation explanatory view of the electric wire damage indicator having the configuration of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Induction coil 2 Reed switch 3 Control means 4 Display means 5 Main body case 10 Main column material 22 Capacitor 26 Display part case 27 Display part cover 30 Case permanent magnet 32 Cover permanent magnet 33 Display 33a Display spring 35 Solenoid 36 Plunger 37 Plunger biasing spring 38 Plunger attracting magnet 39 Piston

Continued on the front page (72) Inventor Minoru Watanabe 885-26 Fujikin, Tsurugashima-shi, Saitama F-term (reference) 2G036 AA22 AA25 AA27 BB20 CA08

Claims (5)

[Claims] 1. A display for displaying whether or not a transmission line is damaged by a lightning strike, comprising: voltage generating means for generating a voltage based on a lightning current flowing due to a lightning strike on the transmission line; Damage detecting means that operates when the power line receives a lightning strike with a long waveform duration that causes damage, and charging means that is charged by the voltage generating means.
An electric wire damage indicator comprising: a control unit that outputs a charging voltage of the charging unit when the damage detection unit operates; and a display unit that is driven by an output of the control unit. 2. A main body case made of resin provided so that a mounting surface thereof is in close contact with a steel tower of the power transmission line, the main body case having the voltage generating means and a voltage generating means for operating by a lightning current flowing through the steel tower. The electric wire damage indicator according to claim 1, wherein the damage detecting means is housed and arranged, and the control means is housed. 3. The wire damage indicator according to claim 1, wherein the voltage generating means is an induction coil, and the damage detecting means is a reed switch. 4. The display means is provided on a side opposite to a mounting surface of the main body case, the display section case having an open end face for housing a display body, and the display section is provided by a magnetic attraction force between the display section case. A display unit lid for closing an open end face of the unit case, and a solenoid that is excited by an output of the control unit, and the display unit lid is closed against a magnetic attraction force when the solenoid is excited. The electric wire damage indicator according to claim 2, further comprising: a driving unit that opens to expose the display body. 5. A plunger movably held by the solenoid, a plunger urging spring for urging the plunger in a direction protruding from the solenoid, and a urging force of the plunger urging spring. A plunger attracting magnet that attracts the plunger in the most retracted state, and a piston that engages with the plunger and pushes out the display unit cover outward by projecting the plunger; and energizing the solenoid. 5. The electric wire according to claim 4, wherein the plunger attracts the magnetic force of the plunger to cancel the magnetic force so that the plunger projects, and the display body has a display spring that urges the display unit cover in the opening direction. Damage indicator.