JP7613784B1 - Cable anti-theft device - Google Patents

Abstract

To provide an anti-theft device for a cable which detects a sign of cable cutting before the cable itself is cut, issues a warning to the thief, contacts various security stations and catches the thief, thereby causing the thief to give up the theft before the cable is cut.
SOLUTION
The cable anti-theft device 10 comprises one or more theft sign detection conductive wires 6a, 6b, 6c covered with an insulator that are attached along the longitudinal direction of the cable 1 near at least both connection ends of the cable 1 and that detect a theft-premonition break that accompanies the start of intentional cutting of the cable 1, detection circuits 30a, 30b, 30c... that detect the break by a change in voltage and/or current based on the theft-premonition break, a notification circuit 40 that issues a break signal based on the detection of the break, and an operation circuit 60 that operates the security device 90 based on the break signal.
[Selected figure] Figure 2

Description

The present invention relates to a cable theft prevention device that is used to detect and prevent theft of cables, particularly main cables, in solar power plants, construction sites, etc. in advance.

In order to realize a carbon-free society, in addition to rooftop solar power generation for home use, solar power generation is also being carried out in vast mountainous areas, wilderness areas, fallow land, and abandoned farmland. Many large-scale commercial solar power plants, such as so-called mega solar power plants with a capacity of 1,000 kW or more and high-voltage solar power plants with a capacity of 50 kW or more, have been established.

In such a commercial solar power plant 100, as shown in FIG. 6, solar panel modules 102, each of which has a solar cell element cell 101 of about 10 cm square arranged lengthwise and widthwise, are combined in series to form a parallel array 103, and sunlight is converted into electricity. For each array 103, a thin cable 104 made of a twisted metal core wire such as copper with excellent conductivity collects electricity through cable terminals 104a and 104b at a terminal box 105 equipped with a solar power collector board, and the voltage is made uniform. From each terminal box 105, a thick trunk cable 106 bundles multiple twisted metal core wires made of copper, covers them with a sheath, and is buried underground, buried in a trench, or protected by a tube, and the electricity is combined at a collector box 107 equipped with a DC collector board through cable terminals 106a and 106b, and then converted to AC through a DC-AC converter 108, also called a power conditioner (PCS), and supplied.

Commercial solar power plants are built in vast areas of land, such as mountainous regions, where there are no resident security guards, making them difficult to see, even during the day, and even more so at night. Combined with the fact that the price of metals, especially copper, has been soaring, trunk cables, which can steal large amounts of copper from large cables at once, are stolen annually to the tune of tens of billions of yen, with the aim of reselling the copper core wires in larger cables rather than smaller cables.

Relevant government agencies, police, and non-life insurance companies have warned that there have been frequent incidents of thefts in which trunk cables 106 are cut near cable terminals 106a and 106b, which are exposed above ground and have their sheaths stripped off in order to connect to the terminal box 105 and assembly box 107, and the entire trunk cable 106 is then taken away.

Similarly, trunk cables have been stolen at night at construction sites, such as buildings constructed of reinforced concrete and where main electrical cables are being installed.

In order to prevent theft of cables at solar power plants and the like and to reduce economic losses due to the suspension of power generation caused by theft, Patent Document 1 discloses an alarm device which is used for crime prevention, and which has "a first power supply means which supplies a first current to a conductor, sounding means which issues an alarm, a second power supply means which supplies a second current to the sounding means, and switch means which is turned ON/OFF in response to the first current or the second current, the first power supply means being connected to earth via the conductor and supplying current to the switch means when the conductor is cut, the second power supply means being connected to the switch means via the sounding means, the sounding means being supplied with current from the second power supply means and being energized when the first power supply means supplies current to the switch means, causing the sounding means to sound an alarm." Such alarm devices sound an alarm when the conductor, i.e. the cable itself, is cut, but if the cable is cut, even if the alarm stops the theft, it will take time and money to repair it. In addition, in remote mountainous areas, thieves may take advantage of the fact that security guards cannot arrive immediately and continue their theft, stealing the cut main cable, further expanding the damage. Not only main cables, but thin cables are also susceptible to similar damage.

Utility Model Registration No. 3209446

The present invention has been made to solve the above problems, and aims to provide an anti-theft device for cables that detects signs of cable cutting before the cable itself is cut, and issues a warning to the thief or contacts various security stations to apprehend the thief, thereby causing the thief to give up the theft before the cable is cut.

In order to achieve the above object, a cable theft prevention device is provided ,
a plurality of theft sign detection conductive wires arranged at both ends of a cable formed by bundling a plurality of electric wires each having a metal core wire covered with an insulating layer;
a detection circuit for detecting a break in the conductive wire based on a change in voltage or current caused by a break in the conductive wire due to an indication of theft caused by an initiation of intentional cutting of the cable ;
a notification circuit that issues a disconnection signal based on the detection of the disconnection;
and an operating circuit for operating at least one of a disconnection signal receiving terminal, a monitoring device, an alarm device, a warning lighting device, a recording device, and a street light extinguisher in response to the disconnection signal ,
The plurality of theft sign detection conductive wires are made of enameled wires covered with an insulator, and
are arranged at equal intervals along the longitudinal direction of the cable,
Or,
The cable includes one or more components arranged at equal intervals along the longitudinal direction of the cable, and one or more components having a circular or spiral portion surrounding the cable.
It is characterized by:

In this cable anti-theft device, it is preferable that the multiple theft detection conductive wires are arranged at equal intervals along the cable.

The cable anti-theft device may have a separate theft detection conductive wire that is attached circumferentially around the cable, detects the theft-premonition wire breakage, and is covered with an insulator.

In this cable anti-theft device, the theft sign detection conductive wire and the cable may be exposed near both ends of the cable .

In the cable anti-theft device, the plurality of theft sign detection conductive wires may be connected to individual detection circuits or may be connected collectively to one detection circuit .

The cable anti-theft device may have a delay circuit connected to the activation circuit to prevent malfunction.

The cable anti-theft device may include a deactivation timer or deactivation circuit connected to the activation circuit.

The cable theft prevention device of the present invention can detect signs of theft before the cable's core wire itself is cut by the thief, and can apply psychological pressure to the thief to discourage the theft while it takes time to cut the core wire, or can dispatch security guards to apprehend the thief.

This cable anti-theft device can be retroactively installed on existing cables, and because it has a simple structure, it can be easily installed using the current cable installation method.

This cable anti-theft device is highly cost-effective because it can be selectively, cheaply and efficiently installed in locations where the cable is likely to be cut in the event of theft.

This cable anti-theft device can reliably detect signs of theft and does not cause false alarms or other devices to go off.

1 is a schematic perspective view showing a theft sign detection conductive wire and its connection destination that form part of a cable theft prevention device to which the present invention is applied, and a cable to be theft prevention target. 1 is a schematic block diagram showing the configuration of one embodiment of an anti-theft device for a cable to which the present invention is applied; FIG. 11 is a circuit diagram of another embodiment of an anti-theft device for a cable to which the present invention is applied. 1 is a schematic perspective view showing another theft sign detection conductive wire and its connection destination that form part of a cable theft prevention device to which the present invention is applied, and a cable to be theft prevention target. FIG. 1 is a schematic perspective view showing another theft sign detection conductive wire and its connection destination that form part of a cable theft prevention device to which the present invention is applied, and a cable to be theft prevention target. FIG. FIG. 1 is a schematic diagram showing a basic configuration of a conventional solar power plant.

The following describes in detail the embodiments of the present invention, but the scope of the present invention is not limited to these embodiments.

One embodiment of the cable anti-theft device of the present invention will be described with reference to FIG. 1, which is a schematic perspective view showing the theft sign detection conductive wire and its connection destination, which are part of the device, and the trunk cable, which is the object to be prevented from theft, and FIG. 2, which is a block diagram showing the outline of the configuration.

As shown in FIG. 1, the cable anti-theft device 10 is used to prevent the theft of a cable 1, such as a trunk cable, which is made by bundling multiple electric wires 3, each of which has a metal core wire 2a made of multiple twisted metal wires such as copper wires and is covered with an insulating layer 2b, with a restraining tape 4 or a restraining thread (not shown) and covering it with a sheath 5, by detecting a theft-premonition disconnection by cutting the theft-premonition detection conductive wire before the metal core wire 2a of the cable 1 is cut.

As shown in FIG. 2 , the cable anti-theft device 10 comprises a power source 20 for driving the cable anti-theft device 10 itself, a timer 24 connected to the power source 20 as necessary and switching ON/OFF according to time periods, anti-theft detection conductive wires 6 a, 6 b, 6 c... which are attached in parallel with the cable 1 near the exposed part of the cable 1, extend to a range where a theft-premonition break should be detected and are folded back to detect a theft-premonition break around the terminal of the cable 1 prior to the start of cutting of the cable 1 itself at the start of the theft of the _{cable 1, and other ends 6 a2 , 6 b2 , 6 c... of the anti-theft detection conductive wires 6 a , 6 b , 6 c... connected to the power} source. and _c2 ... and detect a wire break that is a sign of the theft by a change in voltage and/or current based on the detection of a wire break that is a sign of the theft; a notification circuit 40 connected to the detection circuits 30a, 30b, 30c... and issuing a wire break signal based on the detection of a wire break that is a sign of the theft; a delay circuit 50 connected to the notification circuit 40 as necessary to prevent malfunction; an operation circuit 60 connected to the notification circuit 40 or the delay circuit 50 installed as necessary, and operating at least one of the security devices 90 selected from a wire break signal receiving terminal, a monitoring device, a warning lighting device 91a, an alarm device 91b, a recording device, and a street light extinguisher in response to the wire break signal; and a stop circuit 70 connected to the operation circuit 60 as necessary, for stopping the operation of the security device 90 when the risk of the theft is averted after the detection of a sign of the theft.

In the cable theft prevention device 10, when a thief tries to steal a cable 1, the anti-theft detection conductive wires _6a , _6b , _6c , ... existing on the outer periphery of the cable are cut before the thief cuts the metal core wire 2a in the cable 1, so that the cable can be detected as an anti-theft before the cable is actually stolen.

The theft prediction detection conductive wires _6a , _6b , _6c ... are, for example, enameled wires. Enameled wires are soft copper wires or alumina wires with a diameter of 0.025 to 3.2 mm, on which an insulating coating of varnish containing a polymeric compound with a thickness of about 0.003 to 0.035 mm is baked. Examples of polymeric compounds include polyvinyl formal, polyurethane, polyamide-imide, polyester, and polyamide. If the theft prediction detection conductive wires _6a , _6b , _6c ... are thinner than this range, there is a risk of malfunction due to accidental cutting, and if they are thicker than this range, there is a risk that a thief will recognize the theft prediction detection conductive wires _6a , _6b , _6c ... and will avoid these parts and cut only the cable 1, making it impossible to detect the theft prediction disconnection.

The anti-theft detection conductive wires _6a , _6b , _6c ... may be the same color or a similar color as the insulating layer 2b and/or sheath 5 covering the metal core wire 2a in the electric wire 3, so that a thief would not cut the cable 1 by avoiding the anti-theft detection conductive wires 6a _{, 6b} , _6c... , or they may be a conspicuous color different from that of the insulating layer 2b and/or the sheath 5 so that a thief would recognize that the anti-theft device 10 of the cable is activated and would give up on the theft.

Each of the theft sign detection conductive wires 6a, 6b, 6c... is individually connected to the detection circuits 30a, 30b, 30c.... When at least one of the theft sign detection conductive wires 6a, 6b, 6c... is intentionally cut, the detection circuits 30a, 30b, 30c... detect a change in the current and/or voltage flowing through the theft sign detection conductive wires 6a, 6b, 6c..., making it possible to detect at which end of which cable the cable cutting is about to begin.

More specifically, the cable anti-theft device 10 is configured with a circuit as shown in Figure 3.

A power source 20, for example a 100V commercial alternating current (AC) power source, is used as the power source for the cable anti-theft device 10. A power meter 21 and a fuse 22 are connected to the power source 20. No-fuse breakers (NFB) 23a and 23b are also connected to the power source 20, and an hour meter 24 that is controlled to be turned on and off to stop the anti-theft device 10 from operating only when a security guard or worker is present is connected as necessary, and a fuse 25, a power meter 26, and a reset circuit 27 are connected as necessary.

One ends _6a1 , _6b1 , _6c1 ... of the theft indication detection conductive wires 6a, 6b, 6c... branch out from the power source 20. The other ends _6a2 , _6b2 , _6c2 ... of the theft indication detection conductive wires 6a, 6b, 6c... are connected to detection circuits (X1) 30a, (X2), 30b, (X3), 30c....

The theft detection conductive wires 6a, 6b, 6c, etc. are attached near the end of a trunk cable 106 (see FIG. 6) as cable 1, for example. This trunk cable 106 is made up of multiple electric wires 3, each of which has a metal core 2 made of multiple twisted metal wires 2a and is covered with an insulating layer 2b, bundled with a restraining tape 4 and covered with a sheath 5 (see FIG. 1), and is buried underground, buried in a trench, or protected by a tube except for the vicinity of the end, and is connected to a solar power collector panel of a terminal box 105 via a cable terminal 106a, and is also connected to a DC collector panel of a collector box 107 via a cable terminal 106b (see FIG. 6). Since the terminal box 105 and assembly box 107 are installed on the ground (not shown), the vicinity of these cable terminals 106a and 106b are above ground for connection, and the sheath 5 is stripped to expose the electric wire 3 together with the insulating layer 2b of the metal core wire 2a, while the metal core wire 2a is connected to these assembly boards inside the terminal box 105 and assembly box 107. Such exposed electric wire 3 portions of the cable 106 are places that are easy for thieves to cut.

Therefore, the theft detection conductive wires 6a, 6b, 6c, etc. are attached to the insulating layer 2b on the metal core 2a in the exposed electric wire 3 of the trunk cable 106 as such a cable 1 along the cable length (see Figure 1). The theft detection conductive wires 6a, 6b, 6c, etc. may be attached to the insulating layer 2b on the metal core 2a and installed in the holding tape 4, holding thread, or sheath 5, or may be attached and installed on the holding tape 4, holding thread, or sheath 5, and may be used appropriately. For example, of the theft detection conductive wires 6a, 6b, 6c, etc., the theft detection conductive wire 6a is attached to the exposed part of the insulating layer 2b on the metal core 2a in the electric wire 3 along the cable length. The theft sign detection conductive wire 6a is preferably attached near the cable terminals 106a and 106b (see FIG. 6), which is the range where theft sign disconnection should be detected, for example, over several meters from the cable terminals 106a and 106b to the part where it begins to be buried underground, buried in a trench, or protected by a tube, or over the entire cable 1 if necessary. Theft sign detection conductive wires 6b, 6c, etc. are also attached to the exposed part of the insulating layer 2b on the metal core 2a in the electric wire 3.

The detection circuits (X1) 30a, (X2) 30b, (X3) 30c... are connected in parallel with the first switch circuits (X1) 32a, (X2) 32b, (X3) 32c... in the ON state, and are connected in series. The detection circuits (X1) 30a, (X2) 30b, (X3) 30c... and the first switch circuits (X1) 32a, (X2) 32b, (X3) 32c... are connected by a relay circuit (not shown). When any of the detection circuits (X1) 30a, (X2) 30b, (X3) 30c... detects a break in the theft warning detection conductive wire 6a, 6b, 6c..., the corresponding first switch circuit (X1) 32a, (X2) 32b, (X3) 32c... is turned OFF via the relay circuit (not shown) which recognizes it as a break signal. Correspondingly, if the current is cut off, the notification circuit (X6) 40a is set to operate. The notification circuit (X6) 40a is connected to a relay circuit (not shown) so that if it detects a theft-premonition wire break, it turns on another switch circuit (X6) 41a.

The detection circuits (X1) 30a, (X2) 30b, (X3) 30c... are connected in parallel to the second switch circuits 34a, 34b, 34c... when they are turned OFF. When the first switch circuits (X1) 32a, (X2) 32b, (X3) 32c... are turned OFF, the first switch circuits (X1) 32a, (X2) 32b, (X3) 32c... and the second switch circuits 34a, 34b, 34c... are connected by relay circuits or self-holding circuits (not shown) that are linked so that the corresponding second switch circuits 34a, 34b, 34c... are turned ON. When any of the second switch circuits 34a, 34b, 34c... is turned ON, and current flows through at least one of the second switch circuits 34a, 34b, 34c..., the notification circuit (X7) 40b operates accordingly. The notification circuit (X7) 40b is connected to a relay circuit (not shown) so that it turns on another switch circuit (X7) 41b when it detects a theft warning wire break.

In addition, an example in which the first switch circuits (X1) 32a, (X2) 32b, (X3) 32c... and the second switch circuits 34a, 34b, 34c... are connected in parallel is illustrated, but it is also possible to use the first switch circuits (X1) 32a, (X2) 32b, (X3) 32c... but not use the second switch circuits 34a, 34b, 34c....

If necessary, the notification circuit 40c may be connected to either the notification circuit (X6) 40a, which notifies the next device of a theft-premonition wire break when at least one of the first switch circuits (X1) 32a, (X2) 32b, (X3) 32c, etc. is turned OFF, or the notification circuit (X7) 40b, which notifies the next device of a theft-premonition wire break when at least one of the second switch circuits 34a, 34b, 34c, etc. is turned ON, via a relay circuit. In this case, when the notification circuit (X8) 40c detects a theft-premonition wire break in response to the operation of either the notification circuit (X6) 40a or the notification circuit (X7) 40b, the notification circuit (X8) 40c is connected to another switch circuit (X8) 41c by a relay circuit (not shown) so that the notification circuit (X8) 41c is turned ON. Therefore, even if the switch circuit (X7) 41b does not operate due to some malfunction and no current flows, the switch circuit (X8) 41c will allow current to flow.

Even if these notification circuits (X6) 40a, (X7) 40b, (X8) 40c are activated, regardless of the detection of a break in the theft warning detection conductive wires 6b, 6c, etc., a delay circuit (T1) 50a is provided in parallel with the first switch circuits (X1) 32a, (X2) 32b, (X3) 32c, etc. and the second switch circuits 34a, 34b, 34c, etc. as necessary to prevent malfunction due to voltage fluctuations, voltage drops, voltage interruptions, etc. The delay circuit (T1) 50a is designed so that if the notification circuit (X6) 40a continues to operate for a predetermined time, for example, 1 to 60 seconds, after it starts operating, another switch circuit (T1) 51a is turned ON via a relay circuit.

An actuation circuit 60, which is a flicker relay (FR) circuit, is provided in parallel with the notification circuits (X6) 40a and (X7) 40b, the first switch circuits (X1) 32a, (X2) 32b, (X3) 32c, ..., the second switch circuits 34a, 34b, 34c, ..., the switch circuit (T1) 51a, the switch circuit (X6) 41a, and the switch circuit (X7) 41b. The actuation circuit 60 is connected to security devices 90, such as warning lighting devices 91a and alarm devices 91b, so that when another switch circuit (X6) 41a or (X7) 41b and another switch circuit (T1) 51a are turned ON, a current flows and the actuation circuit 60 is activated.

The alarm device 91b is, for example, a speaker that issues a warning sound or a warning message to a thief. The warning lighting device 91a is, for example, a searchlight that illuminates the vicinity of the theft sign detection conductive wires 6a, 6b, 6c, etc. that a thief is trying to steal from, a tracking light that uses a camera to track and illuminate a moving target such as a thief, a rotating light, or a Patlite (registered trademark). The security device 90 may be a disconnection signal receiving terminal 91c that notifies the security company, management company, owner company, or police of the commercial solar power plant using the cable 1, or a mobile phone or tablet (not shown) carried by a supervisor or security guard. The security device 90 may be a recording device equipped with a camera, such as a night vision camera, that can record not only during the day but also at night. The security device 90 may also be a light-off device that turns off street lights that illuminate the area around the cable 1 at night, making it difficult for thieves to act in the dark.

As shown in Fig. 1, the anti-theft detection conductive wires 6a, 6b, 6c, ... are attached in parallel to the cable, but as shown in Fig. 4, in addition to or instead of being attached in parallel to the cable, a single annular anti-theft detection conductive wire 7a may be provided so as to surround the cable, with one end _7a1 connected to a power source and the other end _7a2 connected to the detection circuit 31a and connected to the switch circuits 33a and 35a via a relay circuit. A plurality of annular anti-theft detection conductive wires 7a may be arranged in a row. This allows theft to be detected as an anti-theft disconnection even when the metal core wire 2a pulls apart the electric wire 3 covered with the insulating layer 2b (see Fig. 3).

5, the cable may be wound in a spiral shape with one end _8a1 of the theft sign detection conductive wire 8a connected to a power source and the other end _8a2 connected to a detection circuit. This simplifies the system by using only one theft sign detection conductive wire 8a and allowing a break in the wire to be detected by a single detection circuit 31a (see FIG. 3).

The operation of the cable anti-theft device 10 is described below with reference to Figure 3.

First, the power source 20 is turned on to activate the cable anti-theft device 10. At this time, the hour meter 24 keeps the cable anti-theft device 10 in the ON state. Meanwhile, the hour meter 24 is set to keep the cable anti-theft device 10 in the OFF state for a specified period of time so that it is not detected as an unexpected break in the wire that is a sign of theft, even if the power is intentionally turned off only while a supervisor or worker is present so that monitoring or work can be performed.

First, when the cable anti-theft device 10 is turned on, current flows through the theft warning detection conductive wires 6a, 6b, 6c, etc.

If such a current flows through the theft warning detection conductive wires 6a, 6b, 6c, etc., the detection circuits (X1) 30a, (X2), 30b, (X3), 30c, etc. will determine that there is no theft warning wire break, and the first switch circuits (X1) 32a, (X2), 32b, (X3), 32c, etc. will not operate. Therefore, the switch circuits (X1) 32a, (X2), 32b, (X3), 32c, etc. will all remain ON, and current will flow. The notification circuit (X6) 40a will determine that there is no theft warning wire break, because current is flowing. As a result, the switch circuit (X6) 41a will not operate, and will remain OFF.
On the other hand, the second switch circuits 34a, 34b, 34c, etc. all remain OFF, and no current flows through them. The notification circuit (X7) 40b determines that there is no disconnection, which is a sign of theft, because no current flows through it. As a result, the switch circuit (X7) 41b does not operate, and remains OFF.

When the switch circuit (X6) 41a and the switch circuit (X7) 41b are OFF, the operating circuit 60, which is a flicker relay circuit, does not work, so security devices 90 such as the alarm device 91b, warning lighting device 91a, and disconnection signal receiving terminal 91c do not operate.

When a thief starts to cut the cable 1 at the exposed part of the insulating layer 2b on the metal core 2a in the electric wire 3, one of the theft sign detection conductive wires 6a, 6b, 6c, etc., for example the theft sign detection conductive wire 6a, is cut and broken before the metal core 2a in the electric wire 3 of the cable 1 is cut. Then, since no current flows to the detection circuit (X1) 30a, it is determined that there is a theft sign break, and the first switch circuit (X1) 32a is changed from ON to OFF via a relay circuit (not shown). As a result, the notification circuit (X6) 40a turns ON the switch circuit (X6) 41a via the relay circuit, causing electricity to flow. On the other hand, when the first switch circuit (X1) 32a is changed to OFF, the second switch circuit 34a is changed to ON. As a result, the notification circuit (X7) 40b turns on the switch circuit (X7) 41b via the relay circuit, causing electricity to flow.

If the notification circuit (X6) 40a continues to operate for a specified time, for example 1 to 60 seconds, preferably 2 to 10 seconds, after it has started operating, it is determined that there is no malfunction and another switch circuit (T1) 51a is turned ON via the relay circuit, allowing electricity to flow.

When the notification circuit (X8) 40c, which is a backup circuit, is activated, the switch circuit (X8) 41c turns ON and electricity is applied.

When switch circuit (X6) 41a, switch circuit (X7) 41b, and switch circuit (T1) 51a, as well as switch circuit (X8) 41c, which is provided as needed, are ON, electricity is passed through the operating circuit 60, which is a flicker relay circuit, and the operating circuit 60 operates to operate security devices 90, such as the alarm device 91b, warning lighting device 91a, and disconnection signal receiving terminal 91c.

The security device 90 is preferably installed in a high place such as a utility pole or tower to prevent it from being destroyed by thieves.

For example, the alarm device 91b may emit a loud warning sound from its speaker, such as a siren, aimed at the thief, or a warning message saying that if the theft is not stopped immediately, a report will be made, giving the thief a sense of danger and discouraging him from continuing the theft.

Alternatively, the warning lighting device 91 uses the operating circuit 60 to recognize which cable 1 is near the theft sign detection conductive wire 6a that the thief is attempting to steal, and then uses a searchlight to shine on the area around the cable 1 that is about to be cut, or a tracking light that uses a camera to track and illuminate a moving target such as a thief, thereby scaring the thief away and making him give up on continuing the theft.

Or, the operating circuit 60 recognizes which cable 1 is near the theft sign detection conductive wire 6a that the thief is trying to steal, and turns on a rotating light, preferably a red rotating light, or a Patlite (registered trademark), near the cable 1 that is about to be cut, to give the thief a sense of danger and discourage him from continuing the theft.

Alternatively, the operating circuit 60 recognizes which cable 1 is near the theft sign detection conductive wire 6a that the thief is attempting to steal, and reports where in the vast solar power plant the theft is attempting to occur to the solar power plant's security company, management company, owner company, or police's disconnection signal receiving terminal 91c by wireless or wired communication, or reports via the internet or wirelessly to the mobile phone or tablet of the supervisor or security guard. This allows security guards or police officers to rush to the scene immediately, which can lead to the arrest of the thief.

If necessary, the security device 90 can be a recording device equipped with a camera, such as a night vision camera or a zoom camera, to record the theft by the thief and use the video as evidence of the theft. If necessary, a drone equipped with a speaker and a camera can be remotely operated to intimidate the thief and dissuade him from continuing the theft.

If necessary, the security device 90 can be used as a streetlight extinguisher to turn off the streetlights that illuminate the solar power plant or construction site at night, making it dark and making it difficult for thieves to commit thefts, and can also buy time for security guards to arrive and capture the thief.

When the theft threat is avoided after theft signs are detected, the operation of the security device 90 may be stopped manually, automatically, or remotely by the stop circuit 70. Alternatively, the cable anti-theft device 10 may be returned to its initial state by the reset circuit 27.

Note that in the example shown in Figures 2 and 3, the anti-theft detection conductive wires 6a, 6b, 6c... are each connected to the detection circuits (X1) 30a, (X2) 30b, (X3) 30c..., but the anti-theft detection conductive wires 6a, 6b, 6c... may be connected together into one and connected to only one detection circuit (X1) 30a. In this case, when any of the anti-theft detection conductive wires 6a, 6b, 6c... is cut, a change in voltage or current occurs, which can be detected by the detection circuit (X1) 30a. This can simplify the configuration of the cable anti-theft device 10.

In the above example, a thief cuts the exposed part of the insulating layer 2b on the metal core 2a in the electric wire 3, but if such an exposed part is housed in a terminal box 105 or assembly box 107 (see Figure 6) that is difficult to destroy, theft detection conductive wires 6a, 6b, 6c, etc. may be attached to the sheath 5.

The multiple theft prediction detection conductive wires 6a, 6b, 6c... may be arranged at unequal intervals, but if they are arranged at equal intervals, then regardless of the direction from which cutting of the cable 1 is initiated, one of the theft prediction detection conductive wires 6a, 6b, 6c... will be broken.
The cable anti-theft device 10 may also use a deactivation timer instead of a deactivation circuit connected to the activation circuit.

An example has been given in which a thick trunk cable 106 is targeted as the cable 3, but the cable theft prevention device 10 can also be used for a thin cable connecting the solar panel modules 102 together within the array 103, or for a thin cable 104 connecting the array 103 to the solar power collector panel of the terminal box.

The anti-theft device 10 for the main cable can also be used for cables at a construction site, such as a building constructed of reinforced concrete and where the main electrical cables are being installed. In this case, once the construction of the building is complete, the main cable will no longer be stolen, so the anti-theft device 10 for the cable can be made removable and reused.

The cable theft prevention device of the present invention is attached to cables that need to be protected from theft in solar power plants, construction sites, etc., and is used to prevent cable theft by issuing a warning to thieves and contacting various security stations, causing them to abandon the theft before cutting the cable, thereby minimizing damage.

Reference numeral 1 denotes a cable, 2a denotes a metal core wire, 2b denotes an insulating layer, 3 denotes an electric wire, 4 denotes a retaining tape, 5 denotes a sheath, _6a , _6b , _6c, ... and _7a and _8a denote theft sign detection conductive wires, _6a1 , _6b1 , _6c1 , ... and _7a1 and _8a1 denote one end of the theft sign detection conductive wire, _6a2 , _6b2 , _6c2, ... and _7a2 and 8a denote one end of the theft sign detection conductive wires, _a2 is the other end of the theft prediction detection conductive wire, 10 is the theft prevention device of the cable, 20 is a power source, 21 is a power meter, 22 is a fuse, 23a and 23b are no-fuse breakers, 24 is an hour meter, 25 is a fuse, 26 is a power meter, 27 is a reset circuit, 30a, 30b, 30c, 30d, ... and 31a are detection circuits, 32a, 32b, 32c, 32d, ... and 33a, as well as 34a, 34b, 34c, 34d, ... and 35a are switch circuits, 40, 40a, 40b, and 40c are notification circuits, 41a, 41b, and 41c are switch circuits. In the figure, the reference numerals 50 and 50a are delay circuits, 51a is a switch circuit, 60 is an operation circuit, 70 is a stop circuit, 90 is a security device, 91a is a warning lighting device, 91b is an alarm device, 91c is a disconnection signal receiving terminal, 100 is a solar power plant, 101 is a solar cell, 102 is a solar panel module, 103 is an array, 104 is a thin cable, 104a and 104b are cable terminals, 105 is a terminal box, 106 is a thick trunk cable, 106a and 106b are cable terminals, 107 is a collection box, and 108 is a DC to AC converter.

Claims (5)

a plurality of theft sign detection conductive wires arranged at both ends of a cable formed by bundling a plurality of electric wires each having a metal core wire covered with an insulating layer;
a detection circuit for detecting a break in the conductive wire based on a change in voltage or current caused by a break in the conductive wire due to an indication of theft caused by an initiation of intentional cutting of the cable ;
a notification circuit that issues a disconnection signal based on the detection of the disconnection;
and an operating circuit for operating at least one of a disconnection signal receiving terminal, a monitoring device, an alarm device, a warning lighting device, a recording device, and a street light extinguisher in response to the disconnection signal ,
The plurality of theft sign detection conductive wires are made of enameled wires covered with an insulator, and
are arranged at equal intervals along the longitudinal direction of the cable,
Or,
The cable includes one or more components arranged at equal intervals along the longitudinal direction of the cable, and one or more components having a circular or spiral portion surrounding the cable.
13. An anti-theft device for a cable, comprising: 2. The anti-theft device for a cable according to claim 1, wherein the anti-theft detection conductive wire and the cable are exposed near both ends of the cable . 2. The anti-theft device for a cable according to claim 1, wherein the plurality of theft detection conductive wires are connected to individual detection circuits or are connected together to one detection circuit . The cable anti-theft device according to claim 1, characterized in that a delay circuit is connected to the activation circuit to prevent malfunction. 2. The anti-theft device for a cable according to claim 1, further comprising a stop timer or a stop circuit connected to said activation circuit.

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