JP2020160017A - Detection display device for electric field around electric wire - Google Patents

Abstract

To provide a detection display device for an electric field around an electric wire which allows for visual confirmation as to whether voltage is applied to an overhead wire such as a trolley wire using no voltage detector, does not require a cable for grounding and is hardly affected by thunder-bolt and a ground fault accident.SOLUTION: The detection display device for an electric field around an electric wire has electric field detection means and display means. The electric field detection means comprises: an inner electrode and an outer electrode arranged concentrically at a predetermined interval; an electric field detection circuit detecting whether an electric field is generated around a detection target electric wire by detecting a DC voltage generated by electric charges induced in the inner electrode and the outer electrode by an electric field around an electric wire penetrating the inside of the inner electrode; and a battery supplying power. The electric field detection circuit is provided between the inner electrode and the outer electrode. Each of the inner electrode and the outer electrode is formed of an insulating material and provided on outer circumferential surfaces or inner circumferential surfaces of two semi-cylindrical members configured to be expandable and closable.SELECTED DRAWING: Figure 1

Description

The present invention relates to an electric field detection display device for an electric wire that detects and displays an electric field generated by applying a voltage to the electric wire, and particularly determines whether or not a voltage is applied to an overhead electric wire such as a trolley wire or a catenary overhead wire of an electric railway. It relates to an electric field detection display device that detects and displays.

A DC voltage of about 1500 V is applied from a substation to a train line (power line) as a transmission line in a DC feeder system for railways. In train lines (power lines) and substations, construction is done after stopping power transmission to the power lines, but it is not possible to tell whether or not voltage is applied just by looking at the power lines. In addition, construction of overhead wires on railway tracks is often carried out at night when trains do not run.

A voltage detector is known as a device for measuring the DC voltage of a train line in a DC feeder system. Conventional voltage detectors include contact type voltage detectors and non-contact type voltage detectors, but it is desirable to use non-contact type voltage detectors for high-voltage power lines from the viewpoint of ensuring safety. As an invention relating to a non-contact type voltage detector, for example, there is one described in Patent Document 1.

However, if a non-contact type voltage detector is used in a section where multiple power lines are congested, it may react to the electric field of adjacent power lines. Therefore, whether or not a voltage is applied to the power line of interest. It is difficult to know exactly.
On the other hand, it has an electro-optical layer (electrometry layer) and an electrode layer whose optical characteristics change when an electric field is applied, and is arranged outside the insulating layer on the outer periphery of the power wire core wire to form a DC or AC potential applied to the core wire. An invention relating to an energization display medium has been proposed in which the optical characteristics of an electro-optical layer are changed by an electric field so that the presence or absence of energization of a power line can be visually recognized (Patent Document 2).

Japanese Unexamined Patent Publication No. 2016-27332 Japanese Unexamined Patent Publication No. 2004-271179 Japanese Unexamined Patent Publication No. 2018-124073

Since the energization display medium described in Patent Document 2 is mounted directly on the power line to be detected, there is no risk of false detection in the congested section of a plurality of power lines, but electricity is generated by the electric field accompanying the energization of the power line. The optical characteristics of the optical layer are changed to enable visual recognition, and the display does not switch only when the applied voltage of the power line becomes zero.

Therefore, by applying the principle of electronic paper as a display medium using electrophoretic particles, one hemisphere has a positively charged body and the other hemisphere has a negatively charged body, and the charged particles are colored in different colors. An invention relating to a pressurized / non-pressurized detection display device has been proposed in which a sheet is attached to the surface of an electric wire in a medium to display whether or not a DC voltage is applied to the electric wire (Patent Document 3). However, in the invention of Patent Document 3, since a grounding wire (cable) for setting the detection indicator to the grounding potential is required, if there is a lightning strike or a ground fault in the electric wire, the grounding wire is used. A large current may flow through it. Further, since it is necessary to add a grounding wire to the power line, there is a problem that the cost is increased and the electric wire is congested.

The present invention has been made by paying attention to the above-mentioned problems, and it is possible to visually confirm whether or not a voltage is applied to an overhead electric wire such as a trolley wire without using a voltage detector. It is an object of the present invention to provide an electric field detection display device for electric wires.
Another object of the present invention is to provide an electric field detection display device for an electric wire which does not require a ground wire and is not easily affected by a lightning strike or a ground fault.

In order to achieve the above object, the present invention
An electric field detection display device for an electric wire having an electric field detecting means for detecting whether or not an electric field is generated around the electric wire to be detected and a display means capable of displaying the detection result by the electric field detecting means.
The electric field detecting means
The inner and outer electrodes arranged concentrically at predetermined intervals,
By detecting the DC voltage generated by the electric charge induced in the inner electrode and the outer electrode by the electric field around the electric field penetrating the inside of the inner electrode, it is detected whether or not an electric field is generated around the electric field to be detected. Electric field detection circuit and
A battery that supplies electric power for operating the electric field detection circuit and the display means, and
With
The electric field detection circuit is arranged between the inner electrode and the outer electrode, while the display means is arranged outside the outer electrode.
The inner electrode is provided on the outer peripheral surface of two semi-cylindrical members formed of an insulating material and configured to be expandable and occluded.
The outer electrode is provided on the outer peripheral surface or the inner peripheral surface of two semi-cylindrical members formed of an insulating material and configured to be expandable and occluded.

According to the electric field detection display device having the above configuration, the display means arranged outside the outer electrode displays according to whether or not an electric field is generated around the electric wire to be detected. It is possible to visually check whether or not voltage is applied to the electric wire without using an electric field, and it is possible to make it less susceptible to lightning strikes and ground faults because no ground wire (cable) is required. .. Further, since the electric field detection circuit is arranged between the inner electrode and the outer electrode, these electrodes function as a shield, and the electric field detection circuit is affected by the electric field generated by applying a voltage to the electric wire. It is possible to make it difficult to receive and improve the operation accuracy, and it is possible to block the electromagnetic noise that jumps in from the outside and prevent the malfunction of the electric field detection circuit.

Here, preferably, the display means is arranged outside the outer electrode.
As a result, the visibility of the display means is improved.
Further, the battery is a rechargeable and dischargeable secondary battery.
The electric field detecting means includes an energy converting means arranged outside the outer electrode and converting light energy into electric energy, and a charging circuit for charging the secondary battery with the electric energy converted by the energy converting means. Is configured to include.
According to such a configuration, since an energy conversion means for converting light energy into electric energy and a charging circuit for charging the secondary battery with the converted electric energy are provided, an electric field detection display is provided for a long period of time without replacing the battery. It becomes possible to operate the device.

Further, preferably, electric power is generated by utilizing the voltage fluctuation between the pair of the first electrode and the second electrode arranged concentrically at predetermined intervals and the electrodes of the first electrode and the second electrode. It is configured to include a second charging circuit.
According to such a configuration, since a charging circuit that generates electric power by utilizing the voltage fluctuation between a pair of electrodes placed in an electric field generated around the electric wire to be detected is provided, it is provided for a long period of time without replacing the battery. It becomes possible to operate the electric field detection display device.

Further, preferably, the display means is a lamp capable of emitting light, and is configured to be lit or blinking when the electric field detection circuit detects that no electric field is generated around the electric wire to be detected. ..
When the electric wire to be detected is a trolley wire of an electric railway or an overhead wire, in general, the time when no voltage is applied to the electric wire is shorter than the time when the electric wire is applied, so that no electric field is generated. By lighting or blinking when it is detected, the power consumption associated with the lighting of the display means can be reduced and the battery life can be extended. It also has a fail-safe function because it is configured to indicate that the display means is extinguished and an electric field is generated in the event of a failure.

Further, preferably, the emission color of the display means is green or blue.
Here, "green or blue" means that in addition to green and blue, an intermediate color between green and blue is included. Generally, green or blue is safely recognized, red is dangerous, and yellow is caution. Therefore, when the display means (LED lamp) is turned on, if red or yellow is turned on, danger, that is, voltage is applied. However, by lighting the display means with a green or blue emission color as in the above configuration, it is possible to recognize that the voltage is not applied to the electric wire and it is safe.

According to the present invention, it is possible to realize an electric field detection display device capable of visually confirming whether or not a voltage is applied to an overhead wire such as a trolley wire without using a voltage detector. In addition, there is an effect that an electric field detection display device that does not require a ground wire (cable) and is not easily affected by a lightning strike or a ground fault can be realized.

An embodiment of an electric field detection display device for an electric wire according to the present invention is shown, (A) is a schematic explanatory view showing a usage mode of the electric field detection display device of the embodiment, and (B) is an electric field detection display device of the embodiment. It is a circuit block diagram of. The detailed configuration of the electric field detection unit constituting the electric field detection display device of the embodiment is shown, (A) is a perspective view showing the appearance of the upper part of the electric field detection unit, and (B) is the appearance of the lower part of the electric field detection unit. The bottom view shown, (C) is a side view showing the appearance of the side surface of the electric field detection unit, and (D) is a cross-sectional side view showing a specific example of the cross-sectional structure of the electric field detection unit. It is a perspective view which shows the state which opened the outer electrode of the electric field detection part which constitutes the electric field detection display device of embodiment. The detailed configuration of the power sensor unit constituting the electric field detection display device of the embodiment is shown, (A) is a perspective view showing the appearance of the upper part of the power sensor unit, and (B) is the appearance of the side surface of the power sensor unit. FIG. 5C is a perspective view showing a state in which the outer electrode of the power sensor unit is opened. It is a circuit block diagram which shows the specific example of the electric field detection circuit which comprises the electric field detection display device of embodiment.

Hereinafter, an embodiment of an electric field detection display device for an electric wire according to the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of an electric field detection display device for an electric wire according to the present invention, and FIG. 1A shows a usage mode of the electric field detection display device of the embodiment.

The electric field detection display device 10 of the present embodiment has an insertion hole in which an overhead electric wire 20 such as a trolley wire or an insulator wire to be detected is inserted in the center, and has an LED lamp for display on the surface. Similar to a known electric wire protection tube made of an insulating material, it has a substantially cylindrical shape and is configured to be expandable along the axial direction, and is suspended by insulators 21A and 21B as shown in FIG. 1 (A). It is attached to the overhead wire 20 that has been lowered.
Further, the electric field detection display device 10 of the present embodiment is composed of an electric field detection unit 11A and a power sensor unit 11B, each of which has a cylindrical shape, and the electric field detection unit 11A and the power sensor unit 11B can be combined with each other. ..

2 and 3 show a detailed configuration of the electric field detection unit 11A constituting the electric field detection display device 10 of the present embodiment, and FIG. 2 (A) shows the upper part of the electric field detection unit 11A and FIG. 2 (B). 2 shows the lower part of the electric field detection unit 11A, FIG. 2C shows the side surface of the electric field detection unit 11A, and FIG. 2D shows an example of the cross-sectional structure of the electric field detection unit 11A. Further, FIG. 3 shows a state in which the outer electrode of the electric field detection unit 11A is opened.

As shown in FIG. 2A, the electric field detection unit 11A has a solar panel (a solar panel) as an energy conversion means for converting light energy into electrical energy on a flat end portion 12a formed on the upper surface of the cylindrical main body 12. A solar cell) 13 is provided. Further, as shown in FIG. 2B, for example, three LED lamps 14A, 14B, and 14C are arranged in a row in the circumferential direction at the lower part of the main body surface.

In the electric field detection display device 10 of the present embodiment, green (or blue) is selected as the emission color of the LED lamps 14A, 14B, 14C, and when the electric field detection unit 11A detects an electric field (pressurized state), the LED is used. The lamps 14A, 14B, 14C are turned off, and the LED lamps 14A, 14B, 14C are turned on (including blinking) when the electric field is not detected (no pressurization state).

The reason for this is that if the lamp is turned on when an electric field is detected, the LED lamps 14A, 14B, and 14C cannot be turned on when the electric field detection display device 10 fails, so that the LED lamp 14A , 14B, 14C so that the worker who sees the off state cannot determine whether it is in a failure state or a state in which no voltage is applied to the electric field to be detected, and makes a false judgment that no voltage is applied. To do. That is, the fail-safe function works by turning on the LED lamps 14A, 14B, and 14C when the non-pressurized state is detected.
In addition, green (or blue) is generally selected as the emission color because green (or blue) is often recognized as safe, red is dangerous, and yellow is caution, so the LED lamp is used when the electric field is not detected. This is because if the 14A, 14B, and 14C are turned on to emit red or yellow light, it may be mistaken as dangerous, that is, a voltage is applied.

Further, as shown in FIG. 2C, the electric field detection unit 11A has a double cylindrical structure including an inner cylinder 15A and an outer cylinder 15B, and an overhead electric wire 20 to be detected is inserted in the center thereof. The insertion hole 16 is provided, and the outer cylinder 15B is composed of two semi-cylindrical members and can be expanded as shown in FIG.
Further, a plurality of arc-shaped ribs 51 are formed on the inner wall of the outer cylinder 15B at appropriate intervals, and the ribs 51 hold the inner cylinder 15A concentrically with the outer cylinder 15B. It is configured to. Of the plurality of ribs 51, the ribs at both ends also function as side plates that close the openings on the end faces of the outer cylinder 15B to prevent rainwater from entering the inside.

Although not shown, the inner cylinder 15A is also composed of two semi-cylindrical members and can be expanded like the outer cylinder 15B. The diameter of the inner cylinder 15A is approximately half the diameter of the outer cylinder 15B. As described above, the inner cylinder 15A and the outer cylinder 15B made of two semi-cylindrical members are expanded so that the overhead electric wire 20 is inserted into the central insertion hole 16 and the two semi-cylinders are inserted. The electric field detection unit 11A can be mounted on the outer periphery of the overhead electric wire 20 by combining the members with the opening sides facing each other and closing the members.

As shown in FIG. 2D, the outer cylinder 15B has an electrode 53 formed by attaching a copper foil to the entire surface of the two semi-cylindrical members 52a and 52b, and the outer surface of the electrode 53 is made of fluororesin. Insulating film 55 such as is coated as a protective film. The semi-cylindrical members 52a and 52b are formed of an insulating material such as ABS resin.
The inner cylinder 15A also has the same structure as the outer cylinder 15B. The inner cylinder 15A has electrodes 53 formed over the entire outer peripheral surface, whereas the outer cylinder 15B does not have the entire outer peripheral surface, but the solar panel 13 as shown in FIGS. 2A and 2B. The electrode 53 is formed on the surface of the portion of the LED lamps 14A to 14C excluding the arrangement portion. In the following description, the electrode 53 of the outer cylinder 15B will be referred to as an external electrode, and the electrode 53 of the inner cylinder 15A will be referred to as an internal electrode.

Further, as shown in FIG. 3, the electric field detection unit 11A has a power supply voltage on the electric field detection substrate 17 having an electric field detection circuit between the inner cylinder 15A and the outer cylinder 15B and the circuit on the electric field detection substrate 17. A chargeable / dischargeable secondary battery 18A and a charging substrate 19A having a charging circuit for the secondary battery 18A are provided. In this way, by disposing the electric field detection substrate 17 between the inner cylinder 15A and the outer cylinder 15B having electrodes on their respective surfaces, the electrode 53 of the inner cylinder 15A functions as a shield for electric field detection. The circuit on the substrate 17 is less affected by the electric field generated by applying the voltage to the electric field 20 inserted through the electric field detection unit 11A, and the operation accuracy can be improved. In addition, the electrode 53 of the outer cylinder 15B functions as a shield against electromagnetic noise that jumps in from the outside, and malfunction of the circuit on the electric field detection substrate 17 can be prevented.

FIG. 4 shows a detailed configuration of the power sensor unit 11B constituting the electric field detection display device 10 of the present embodiment. FIG. 4A shows the upper part of the power sensor unit 11B, and FIG. 4B shows the power sensor. The side surface of the portion 11B, FIG. 4C shows a state in which the outer electrode of the power sensor portion 11B is opened.
The power sensor unit 11B has a structure similar to that of the electric field detection unit 11A. Specifically, as shown in FIG. 4C, it has a double cylindrical structure composed of an inner cylinder 15A and an outer cylinder 15B, each of which is configured to be expandable, and the inner cylinder 15A and the outer cylinder are formed. A conductor layer made of copper foil constituting the electrode 54 (outside) and the electrode 54 (inside) of FIG. 1 is formed over the entire outer surface of 15B. The electrode provided on the outer cylinder 15B may be an inner peripheral surface.

The cross-sectional structures of the inner cylinder 15A and the outer cylinder 15B are the same as those of the electric field detection unit 11A, and the electrodes (54) formed by sticking copper foil on the entire surfaces of the semi-cylindrical members 52a and 52b as in FIG. 2D. The outer surface of the electrode is coated with a thin insulating film 55 having a thickness of 1 mm or less and made of a synthetic resin such as fluororesin as a protective film.
On the other hand, as shown in FIG. 4C, a secondary battery 18B and a charging substrate 19B thereof are provided between the inner cylinder 15A and the outer cylinder 15B of the power sensor unit 11B.

FIG. 1B shows a circuit configuration diagram of the electric field detection display device 10 of the present embodiment.
In FIG. 1B, the same parts as those shown in FIGS. 3 and 4 are designated by the same reference numerals. As shown in FIG. 1 (B), the electrode 53 (inside) of the inner cylinder 15A of the electric field detection unit 11A and the electrode 53 (outside) of the outer cylinder 15B are connected to the electric field detection substrate 17 by lead wires 31 and 32. The LED lamps 14A to 14C are connected by the lead wire 33.

Further, the electric field detection substrate 17 is connected to the charging substrate 19A of the electric field detection unit 11A and the charging substrate 19B of the power sensor unit 11B. Further, the solar panel 13 and the secondary battery 18A are connected to the charging board 19A, and the internal electrodes 54 (inside) and the external electrodes 54 (outside) of the power sensor unit 11B are connected to the charging board 19B by the lead wires 34 and 35. Is connected.

In FIG. 1B, the internal electrode 53 (inside) and the external electrode 53 (outside) of the electric field detection unit 11A, the internal electrode 54 (inside) and the external electrode 54 (outside) of the power sensor unit 11B are electrically connected. Although the electrodes are separated from each other, the electrodes 53 (inside) and 53 (outside) and the electrodes 54 (inside) and 54 (outside) may be electrically connected, and by electrically connecting the electrodes. The area of the electrode that detects the electric field can be increased to improve the detection accuracy of the electric field detecting substrate 17 and the power generation capacity of the charging substrate 19B.

Even if the electric wire 20 to be detected allows a DC current to flow, the DC current flowing through the electric wire 20 contains a pulsating current (AC component) because the alternating current is rectified and flows in a substation or the like, and the internal electrode. Since the voltage between the electrodes of the capacitor having the 54 (inside) and the external electrode 54 (outside) as terminal electrodes fluctuates due to the above pulsating current, the charging substrate 19B generates electric power by utilizing this voltage fluctuation and is secondary. It is configured to charge the battery 18B. Then, the power supply voltage of the secondary battery 18B charged by the charging board 19B is supplied to the electric field detection board 17 via the lead wire 36.

FIG. 5 shows a configuration example of an electric field detection circuit on the electric field detection substrate 17 constituting the electric field detection display device 10 of the present embodiment.
As shown in FIG. 5, the electric field detection circuit integrates the current detector 71 in which a pair of input terminals are connected to the external electrode 53 (outside) and the internal electrode 53 (inside), and the output of the current detector 71. A circuit 72 and a drive circuit 73 for passing a current that receives the output of the integrating circuit 72 and lights the LED lamps 14A to 14C are provided.

The current detector 71 flows when a voltage is applied to the electric wire 20 to be detected and a charge is induced in the external electrode 53 (outside) and the internal electrode 53 (inside) by an electric field generated around the electric wire 20. It detects the current. For example, as shown in FIG. 5, the feedback resistor Rf, the positive power supply voltage Vcc, and the negative power supply connected between the operational motor AMP1 and the inverting input terminal (-) and the output terminal of the operational capacitor AMP1. It is equipped with resistors R1 and R2 that divide the difference voltage of voltage −Vcc to generate a reference potential (bias voltage), and the external electrode 53 (outside) is a non-inverting input to the inverting input terminal (-) of the operational amplifier AMP1. An internal electrode 53 (inside) is connected to each of the input terminals of the terminal (+).

Further, the operational amplifier AMP1 is driven by a positive power supply voltage Vcc and a negative power supply voltage −Vcc, and is configured to operate as a bipolar amplifier capable of discriminating the polarity of the electric field. Then, due to the virtual grounding characteristic of the operational amplifier AMP1, the non-inverting input terminal (+) and the inverting input terminal (-) have the same potential, and a potential difference is generated between the external electrode 53 (outside) and the internal electrode 53 (inside). It is designed not to let you.

In the current detector 71 shown in FIG. 5, since the external electrode 53 (outside) and the internal electrode 53 (inside) are connected to the input terminal of the operational capacitor AMP1, an electric field detection circuit including the current detector 71 is placed in the electric field. When installed, electric charges having different polarities are induced in the external electrode 53 (outside) and the internal electrode 53 (inside), and the current generated when the electric charges move is detected. At this time, the virtual grounding characteristic of the operational amplifier AMP1 prevents a potential difference from occurring between the external electrode 53 (outside) and the internal electrode 53 (inside), so that the electric field detection circuit has a predetermined thickness. It can be regarded as operating as a metal plate.

The integration circuit 72 after the current detector 71 is a circuit for time-integrating the current value detected by the current detector 71, and is an input resistor Ri, an operational amplifier AMP2, a feedback capacitance (integration capacitance) Cf, and a series resistance R3. , R4 is provided, and the voltage divided by the resistors R3 and R4 is applied to the non-inverting input terminal (+) of the operational amplifier AMP2. Since the electric field to be measured in this integrating circuit 72 is due to the DC voltage, the current value is calculated by the following equation (1). Here, I is the current value, t is the time, ε is the dielectric constant, s is the electrode area, and E (t) is the electric field strength.

……（１）
式（１）より、電流Ｉの積分値は、電極面積ｓと電界強度Ｅ（ｔ）に比例することが分かる。

…… (1)
From the equation (1), it can be seen that the integrated value of the current I is proportional to the electrode area s and the electric field strength E (t).

The current detector 71 and the integrator circuit 72 are not limited to the circuit shown in FIG. 5, and as described in, for example, Japanese Patent Application Laid-Open No. 2018-115882, the current detection in FIG. 5 By replacing the feedback resistor Rf of the device 71 with a capacitor and omitting the integrating circuit 72, it is possible to configure the circuit as an integrated circuit having a current detection function and an integrating function. Further, the integrator circuit 72 shown in FIG. 5 may be configured as a digital integrator by using a semiconductor integrated circuit such as an MPU (Micro Processing Unit) or a DSP (Digital Signal Processor). The same applies to the current detector 71.

Although the invention made by the present inventor has been specifically described above based on the embodiment, the present invention is not limited to the above embodiment. For example, the electric field detection substrate 17 is provided with a switch capable of short-circuiting between the external electrode 53 (outside) and the internal electrode 53 (inside), and when a charge bias occurs between the electrodes due to noise or the like, a short circuit occurs. The switch may be turned on to reset the charge bias and prevent a decrease in measurement accuracy. Further, instead of turning on the LED lamps 14A, 14B, 14C when the electric field is not detected, the LED lamps 14A, 14B, 14C may be turned on when the electric field is detected. Further, in the above embodiment, the LED lamps 14A, 14B, 14C are provided on the outer surface of the outer cylinder 15B, but they may be provided at another location such as the side portion of the outer cylinder 15B or the inner cylinder 15A.

Further, in the above embodiment, the secondary batteries 18A and 18B are provided in the electric field detection unit 11A and the power sensor unit 11B, respectively, but the secondary battery 18B on the power sensor unit 11B side is omitted and the charging substrate 19B is used. The secondary battery 18A on the electric power detection unit 11A side may be configured to be rechargeable.
Further, in the above-described embodiment, the embodiment in which the solar panel 13 for charging the secondary battery 18A is provided in the electric field detection unit 11A has been described, but the solar panel 13 may be omitted, and the piezoelectric panel 13 may be omitted instead of the solar panel 13. It is also possible to provide an element or the like that generates electricity by vibration or wind power.

Further, in the above embodiment, the case where it is applied to the electric field detection display device for detecting whether or not a voltage is applied to the electric wire transmitting direct current has been described as an example, but the electric field detection display device for the electric wire of the present invention has been described. Can also be used to detect whether or not a voltage is applied to an electric wire that transmits alternating current. Further, the detection target of the electric field detection display device is not limited to overhead electric wires, and the present invention can also be used for electric wires that transmit direct current or alternating current in a substation.

10 Electric field detection display device 11A Electric field detection unit 11B Power sensor unit 13 Solar panel (energy conversion means)
14A, 14B, 14C LED lamp (display means)
15A Inner cylinder 15B Outer cylinder 53 (outer), 54 (outer) Outer electrode 53 (inner), 54 (inner) Inner electrode 17 Electric field detection board 18A, 18B Secondary battery 19A, 19B Charging board 20 Overhead wire

Claims (6)

An electric field detection display device for an electric wire having an electric field detecting means for detecting whether or not an electric field is generated around the electric wire to be detected and a display means capable of displaying the detection result by the electric field detecting means.
The electric field detecting means
The inner and outer electrodes arranged concentrically at predetermined intervals,
By detecting the DC voltage generated by the electric charge induced in the inner electrode and the outer electrode by the electric field around the electric field penetrating the inside of the inner electrode, it is detected whether or not an electric field is generated around the electric field to be detected. Electric field detection circuit and
A battery that supplies electric power for operating the electric field detection circuit and the display means, and
With
The electric field detection circuit is arranged between the inner electrode and the outer electrode.
The inner electrode is provided on the outer peripheral surface of two semi-cylindrical members formed of an insulating material and configured to be expandable and occluded.
The electric field detection display of an electric wire is characterized in that the outer electrode is provided on an outer peripheral surface or an inner peripheral surface of two semi-cylindrical members formed of an insulating material and configured to be expandable and occluded. apparatus. The electric field detection display device for an electric wire according to claim 1, wherein the display means is arranged outside the outer electrode. The battery is a rechargeable and dischargeable secondary battery.
The electric field detecting means includes an energy converting means arranged outside the outer electrode and converting light energy into electric energy, and a charging circuit for charging the secondary battery with the electric energy converted by the energy converting means. The electric field detection display device for an electric wire according to claim 1 or 2, wherein the device comprises. A second charging circuit that generates electric power by using a pair of first and second electrodes arranged concentrically at predetermined intervals and voltage fluctuations between the first and second electrodes. The electric field detection display device for an electric wire according to any one of claims 1 to 3, wherein the electric field detection display device is provided. The display means is a lamp capable of emitting light, and is characterized in that the electric field detection circuit is configured to light up or blink when it detects that no electric field is generated around the electric wire to be detected. The electric field detection display device for an electric wire according to any one of claims 1 to 4. The electric field detection display device for an electric wire according to claim 5, wherein the emission color of the display means is green or blue.

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