JP4040142B2 - Flashing indicator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flashing indicator that indicates that a lightning strike has occurred on a support that supports a power transmission line.
[0002]
[Prior art]
In order to prevent lightning strikes on the power transmission and distribution line, an overhead ground line is installed above the power line. When the overhead ground wire is not shielded and lightning strikes the power line, the potential of the power line rises significantly and exceeds the insulation capacity of the insulator, and a flash current flows into the ground through the steel tower that supports the transmission line. In addition, when a lightning strikes directly on the tower, the potential of the tower rises significantly, and the so-called reverse flash current may occur, exceeding the insulation capacity of the insulator. Once a discharge path is formed due to these flashing accidents, a current during power transmission may flow into the ground along the discharge path, and a safe power transmission state may not be maintained. For this reason, it is necessary to promptly find the tower where the flash accident occurred and take repair measures.
[0003]
A flashing indicator is known as a device for detecting a lightning-powered tower. For example, Japanese Utility Model Registration No. 2529349 discloses a flashing indicator that detects a lightning strike current, causes a flash lamp to emit light, uses a decrease in mechanical strength, and opens a lid by a spring force to display a display cloth. It is disclosed. Japanese Utility Model Publication No. 4-79268 discloses a flashing indicator that detects a lightning strike current, operates an internal circuit, operates a solenoid by a built-in power supply to open a lid of the display, and displays a display cloth. Yes.
[0004]
[Problems to be solved by the invention]
The flashing indicator of the utility model registration No. 2529349 described above operates irreversibly, and once the display unit performs display operation, it cannot be used thereafter. I had to change or replace parts. On the other hand, the flashing indicator disclosed in Japanese Utility Model Publication No. 4-79268 is reversible, but the performance of the internal power supply deteriorates due to the frequency of operation, ambient temperature, and aging, and the certainty of the operation is lost. There was a risk of being caught.
[0005]
In addition, the conventional flashing indicator uses an air-core coil as a current transformer serving as a lightning current detection sensor. Since the air-core coil has a small output current and is not stable, the flashing indicator sometimes malfunctions. Also, changing the output current with an air-core coil requires the trouble of adjusting the number of turns of the coil, changing the resistance on the output side, or finely adjusting the distance between the tower to which the flashing indicator is attached and the coil. Operation is required.
[0006]
The present invention has been made to solve these various problems. It does not require an internal power supply, can be easily reset and used repeatedly after a display operation, and a stable output current can be obtained in the coil that is the detection sensor, and the output current can be changed with a simple operation. You can make it in, and it is an object of maintenance and maintenance to provide easy blende fault indicator.
[0007]
[Means for Solving the Problems]
A flashing indicator to which the present invention is applied to achieve the above object will be described below with reference to the drawings corresponding to the embodiments.
[0008]
As shown in FIGS. 1 and 2, the flashing indicator of the present invention is fixed to a container 3 with a lid 2 that houses a display medium 1, and either the lid 2 or the container 3. It has a solenoid 5 engaged on one side and a detection coil 11 for detecting a lightning strike current, and the output of the detection coil 11 is connected as a drive source of the solenoid 5, and the engagement is released by the drive of the solenoid 5, and the lid The display medium 1 is exposed (see FIG. 3) by opening 2. As shown in FIG. 4, the magnetic material 13 can be inserted into and removed from the hollow core 12 of the detection coil 11.
[0009]
Similarly, as shown in FIG. 1, the lid 2 and the container 3 are connected by a coil spring 6, and the cloth that is the display medium 1 is stored in a space in the center of the coil spring 6 in a folding manner.
[0010]
Hollow of the core 12 of the detection coil 11, the magnetic material 13 that allows insertion and removal, it is possible to adjust the output current of the detection coil 11.
As a circuit 20 in which the output of the detection coil 11 is connected as a drive source of the solenoid 5, as shown in FIG. 5, the rectifier circuit 21 that rectifies the output current of the detection coil 11 and the output current of the rectifier circuit 21 are charged. It has the capacitor | condenser 22, and it is comprised so that the solenoid 5 may operate | move with the discharge current. The presence of the circuit 20 causes the solenoid 5 to be driven with current energy derived from a lightning strike current, and the flashing indicator itself does not have to have a special operating power source.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing a main part of an operation standby state of a flashlight display to which the present invention is applied, FIG. 2 is a cross-sectional view showing a state during operation, and FIG. 3 is an overall perspective view showing a state after operation. is there.
[0012]
The whole flashing indicator has a solenoid 3, a coil spring 6, a display cloth 1, and a circuit 20 housed in a container 3 fitted with a lid 2, and a detection coil 11 housed in a coil case 10 via the circuit 20. Connected to the solenoid 5. The container 3 is attached to the coil case 10, and the coil case 10 is attached in close contact with an appropriate portion of the transmission line tower 30 where the lightning strike current is to be detected.
[0013]
The solenoid 5 is a latching type that is always suctioned, and is attached to a chassis 4 that is integral with the container 3. A pivot lever 7 connected to the plunger 9 is pivotally supported by the chassis 4, and a tip rod 8 of the pivot lever 7 is detachably engaged with a latch rod 16 attached to the lid 2. Further, the latch rod 17 attached to the lid 2 is loosely fitted in the latch hole 18 attached to the container 3.
[0014]
On the other hand, a coil spring 6 is connected to the chassis 4 and the lid 2 and is sandwiched in a compressed state. Further, a display blanket 1 having a length approximately equal to the length when the coil spring 6 is extended is connected to the chassis 4 and the lid 2 at both ends in the space of the central portion of the coil spring 6 and stored in a folding screen. It has been.
[0015]
The detection coil 11 is wound around a rectangular bobbin (winding core) 12 as shown in FIG. A plurality of plate-like magnetic materials 13 are inserted into the hollow of the bobbin 12, and these can be removed, and an arbitrary number of magnetic materials 13 can be inserted to adjust the output current of the detection coil 11. ing. The detection coil 11 is housed in the coil case 10, and a lead wire is led out from a hole formed in the side surface of the case 10 and connected to the circuit 20. Both ends of the case 10 are covered with end plates 14.
[0016]
The circuit 20 shown in FIG. 5 has an input connected to the output of the detection coil 11, has a varistor 23, a rectifier circuit 21, a capacitor 24, a relay 25, and a capacitor 22, and an output connected to the solenoid 5. The varistor 23 absorbs a surge voltage from the output voltage of the detection coil 11 and obtains a stable voltage. The rectifier circuit 21 performs full-wave rectification with a diode assembled in a bridge. The capacitor 24 stores the output current of the rectifier circuit 21. The capacitor 22 also stores the output current of the rectifier circuit 21, but has a larger capacity than the capacitor 24.
[0017]
As shown in FIG. 3, this flashing indicator is attached to the transmission line tower 30. When a lightning strike current flows through the tower 30 due to a lightning strike or the like, a magnetic field is generated around it, and the magnetic field is detected by the detection coil 11 and the current is detected. Is output.
[0018]
This output current flows into the circuit 20, is rectified by the rectifier circuit 21, is stored in the capacitor 24 and the capacitor 22, and then the current flows through the coil of the relay 25. Therefore, since the relay 25 is turned on, an output current flows through the solenoid 5. At this time, even if the lightning strike current has already stopped, a current sufficient to operate the solenoid 5 flows due to the amount of electricity stored in the capacitor 22.
[0019]
When a current flows through the solenoid 5, the plunger 9 of the solenoid 5 is pushed from the state shown in FIG. 1, and the rotating lever 7 rotates counterclockwise, so that the tip rod 8 is engaged with the latch rod 16. The latch 2 is released and the latch of the lid 2 is released. Here, the lid 2 is pushed by the repulsive force of the spring 6 in the compressed state, and the latching rod 17 comes out of the latching hole 18 (see FIG. 2). The lid 2 drops and hangs until the spring 6 is fully extended, and the folding folding of the display cloth 1 extends and spreads, and the display cloth 1 can be visually recognized from a distance through between the filaments of the coil spring 6 (see FIG. 3).
[0020]
The flashing indicator in this display state is reset by the following procedure. Since the capacitor 22 of the circuit 20 has already been discharged, the solenoid 5 manually returns the turning lever 7 in the clockwise direction, so that the plunger 9 before operation is in a suction state. Then, holding the hanging lid 2 manually, aligning the latching rod 17 with the latching hole 18 and inserting the lid 2 into the container 3, the latching rod 16 pushes the tip rod 8, and the pivot lever 7 After a slight rotation, the hooks 16 and the tip hooks 8 are engaged with each other, and the hooks 17 are loosely fitted into the hooking holes 18 so that the lid 2 is stably fitted into the container 3. At this time, the coil spring 6 is compressed, and at the same time, the display cloth 1 is folded and stored by folding. That is, the flashing indicator returns to the initial state shown in FIG.
[0021]
As described above, this flashing indicator is operated in a manner that the returning operation of the display cloth 1 is linked with the operation of returning the coil spring 6, that is, the operation of filling the lid 2 into the container 3, and thus the display cloth 1 is wound up. This eliminates the need for unnecessary work and makes it very easy to complete the reset.
[0022]
Further, in this flashing indicator, since the magnetic material 13 is inserted into the hollow of the bobbin 12 of the detection coil 11, the sensitivity of the detection coil to the lightning current flowing through the tower 30 is increased, and the solenoid 5 is connected from the detection coil 11. Sufficient current can be obtained for operation, and no special power source for operating the solenoid 5 is required.
[0023]
Further, since the number of magnetic members 13 inserted into the bobbin 12 can be freely adjusted, the output current of the detection coil 11 can be easily changed. The shape of the bobbin 12 may be not only the illustrated rectangle but also a circle, and the magnetic material 13 to be inserted into the hollow may be not only a plate but also a plurality or a single rod. In addition to adjusting the number of insertions of the magnetic material 13, the output current of the detection coil 11 can be changed by adjusting the insertion depth of the magnetic material 13.
[0024]
In order to investigate the influence of the number of inserted magnetic members 13 on the output current of the detection coil 11, a test circuit device shown in FIG. 6 was created and measured. This test circuit includes a high voltage power supply 31, a manual switch 32, capacitors 33 and 34, a solenoid switch 35, a waveform adjusting coil 36, and a resistor 37. In this test circuit, when the manual switch 32 is turned on, the capacitors 33 and 34 are charged from the high voltage power supply 31. Next, when the manual switch 32 is turned off and the solenoid switch 35 is turned on to discharge the capacitors 33 and 34, a simulated lightning current flows through the angle member 30A equivalent to the steel tower material. The simulated lightning current is converted into a voltage by the shunt resistor 38 and can be observed with an oscilloscope (not shown). A detection coil 11 housed in the coil case 10 shown in FIG. 4 is attached to the angle member 30A, and an output current is obtained by detecting a simulated lightning current. A circuit 20 shown in FIG. 5 is connected to the detection coil 11. In FIG. 5, the output of the circuit 20 is connected to the solenoid 5, but here it is for measuring the output energy, so it is connected to an oscilloscope (not shown) instead of the solenoid 5. Therefore, the output electric energy after passing through the circuit 20 from the detection coil 11 can be observed with an oscilloscope.
[0025]
The results of measuring the output electrical energy after passing through the circuit 20 from the detection coil 11 with an oscilloscope by changing the number of the magnetic members 13 inserted into the hollow of the bobbin 12 of the detection coil 11 with this test circuit device. 7 shows. As the magnetic material 13, a permalloy magnetic material was used. The simulated lightning current was an impulse current of 800 A, the impulse wavefront length / wavetail length was 8/20 μs, and was observed with an oscilloscope. The size of the angle member 30A is L65 × 65. Further, the detection coil 11 was measured for windings of 4, 6, 10, and 12 respectively.
[0026]
【The invention's effect】
As described above in detail, the flashing indicator to which the present invention is applied can be easily used after being returned to the initial state by a simple operation after the display operation. Since a stable high output current is obtained in the detection coil which is a lightning current sensor, no special power source for operating the flashing indicator itself is required. In addition, the output current of the detection coil can be changed with a simple operation. Therefore, adjustment, maintenance, and maintenance of the flashing indicator become very easy.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a main part of an operation standby state of a flashing indicator to which the present invention is applied.
FIG. 2 is a cross-sectional view showing a state during operation of a flashing indicator to which the present invention is applied.
FIG. 3 is an overall perspective view showing a state after the operation of the flashing indicator to which the present invention is applied.
FIG. 4 is a detailed perspective view of a detection coil used in a flashing indicator to which the present invention is applied.
FIG. 5 is a circuit diagram of a flashing indicator to which the present invention is applied.
FIG. 6 is a circuit diagram of an apparatus for evaluating the performance of a flashing indicator to which the present invention is applied.
FIG. 7 is a diagram showing the results of performance evaluation of a flashing indicator to which the present invention is applied.
[Explanation of symbols]
1 is a display cloth, 2 is a lid, 3 is a container, 4 is a chassis, 5 is a solenoid, 6 is a coil spring, 7 is a rotating lever, 8 is a tip rod, 9 is a plunger, 10 is a coil case, 11 is a detection coil, 12 is a bobbin, 13 is a magnetic material, 14 is an end plate, 16 is a latching rod, 17 is a latching rod, 18 is a latching hole, 19 is a circuit, 21 is a rectifier circuit, 22 is a capacitor, and 23 is Varistor, 24 is a capacitor, 25 is a relay, 30 is a transmission line tower, 31 is a high voltage power source, 32 is a manual switch, 33 is a capacitor, 34 is a capacitor, 35 is a solenoid switch, 36 is a coil for adjusting a waveform, 37 is a resistor , 38 is a shunt resistor, and 30A is an angle material.

Claims (3)

A container with a lid for storing a display medium, a solenoid fixed on one side of the lid and the container, and a solenoid hooked on the other side, and a magnetic material can be inserted into and removed from the hollow of the winding core was, and a detection coil for detecting the lightning current, the output of the detection coil is connected as a drive source for the solenoid, is the display medium by said engagement is released the lid by the drive of the solenoid opens A flashing indicator characterized by exposure.     2. The flashlight according to claim 1, wherein the lid and the container are connected by a coil spring, and the cloth which is the display medium is stored in a space at the center of the coil spring in a folding manner. display. As circuits that will be connected as a drive source of the detection output is the solenoid coil, a rectifier circuit for rectifying the output current of the detection coil, and a capacitor to be charged to the output current of the rectifier circuit, the discharge current 2. The flashing indicator according to claim 1, wherein the solenoid operates.

Images