Cable theft prevention device

Abstract

To provide a cable theft prevention device that detects a sign of cutting of a cable before the cable itself is cut, issues a warning to a thief or contacts security departments to capture the thief, and thereby deterring theft before the cable is actually cut.SOLUTION: A cable theft prevention device 10 includes: a plurality of theft-sign detection conductive wires 6a, 6b, 6c that are disposed at both end portions of a cable 1 formed by bundling a plurality of electric wires 3 each having a metallic core wire 2a covered with an insulating layer 2b; detection circuits 30a, 30b, 30c ... that detect disconnection according to a change in voltage or current based on the theft-sign disconnection accompanying intentional cutting start of the cable 1; and a notification circuit 40 that outputs a disconnection signal on the basis of the detection of disconnection. The device also includes an activation circuit that activates a first crime prevention instrument 90 comprising a remotely controlled drone, or activates the first crime prevention instrument 90 and a second crime prevention instrument 90 such as a disconnection-signal receiving terminal, a monitoring instrument, an alarm instrument, or a warning lighting instrument in response to the disconnection signal.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an anti-theft device for cables used to detect and prevent theft of cables, particularly trunk cables, in solar power plants, construction sites, etc. in advance. [Background technology]

[0002] In order to realize a carbon-free society, in addition to rooftop solar power generation for homes, solar power generation is also being carried out in vast mountainous areas, wilderness, fallow land, and abandoned farmland. Many large-scale commercial solar power plants have been established, such as so-called mega solar power plants with a capacity of 1000 kW or more and high-voltage solar power plants with a capacity of 50 kW or more.

[0003] In such a commercial solar power plant 100, as shown in Fig. 6, solar panel modules 102, each of which has a plurality of solar cell element cells 101, each approximately 10 cm square, arranged lengthwise and widthwise, are combined in series to form parallel arrays 103, and sunlight is converted into electricity. For each array 103, thin cables 104 made of twisted metal core wires, such as copper, with excellent conductivity, are used to collect current and make the voltage uniform at terminal boxes 105 equipped with solar power collection panels via cable terminals 104a and 104b. From each terminal box 105, a thick trunk cable 106, in which multiple twisted metal core wires made of copper are bundled and covered with a sheath, is buried underground, in a trench, or protected by a tube, and the power is combined at collection box 107 equipped with a DC collection panel via cable terminals 106a and 106b. The power is then converted to AC via a DC-to-AC converter 108, also known as a power conditioner (PCS), and supplied.

[0004] Commercial solar power plants are built in vast areas such as mountainous regions where there are no permanent security guards, making them difficult to see, even during the day, and even more so at night. This, combined with the fact that the price of metals, especially copper, is rising sharply, means that trunk cables, which can steal large amounts of copper from large diameter cables at once, are stolen to the tune of tens of billions of yen each year, with the aim of reselling the copper core wires in larger diameter cables rather than smaller diameter cables.

[0005] The relevant government ministries, police and non-life insurance companies have issued warnings that there have been many cases of thefts in which trunk cable 106 has been cut near cable terminals 106a and 106b, which are located near terminal box 105 and collection box 107 and have their sheaths stripped off in order to connect to these collection boards, and the trunk cable 106 itself has been taken away.

[0006] Similarly, at construction sites such as buildings constructed with reinforced concrete and where main electrical cables are being installed, trunk cables have been stolen at night.

[0007] 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, and when the first power supply means supplies current to the switch means, the sounding means is supplied with current from the second power supply means and becomes energized, causing the sounding means to emit a sound." Such alarm devices sound an alarm when the conductor, i.e., the cable itself, is cut, but even if the alarm stops the theft once it is cut, not only does it take time and money to repair, but 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 increasing the damage. Not only main cables but also thin cables are susceptible to similar damage.

[0008] [Patent Document 1] Utility Model Registration No. 3209446 Summary of the Invention [Problem to be solved by the invention]

[0009] To provide an anti-theft device for a cable that detects signs of cable cutting before the cable itself is cut, issues a warning to the thief, contacts various security stations to capture the thief, and causes the thief to abandon the theft before the cable is cut. [Means for solving the problem]

[0010] The cable theft prevention device made to achieve the above object is: a plurality of theft detection conductive wires disposed 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 that detects a break in the cable based on a change in voltage or current of the theft-premonition detection conductive line due to an initiation of intentional cutting of the cable; a notification circuit that issues a disconnection signal based on the detection of the disconnection; The device has an operating circuit that operates a first security device consisting of a drone in response to the disconnection signal, or operates the first security device and at least one second security device consisting 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 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 is made up of 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 that surrounds the cable. It is characterized by:

[0011] In this cable anti-theft device, for example, the drone is equipped with a speaker and / or a camera.

[0012] In this cable anti-theft device, for example, the drone is remotely controlled.

[0013] In this cable anti-theft device, the plurality of theft detection conductive wires are preferably arranged at equal intervals along the cable.

[0014] The cable anti-theft device may have one or more separate theft sign detection conductive wires wound around the cable in the circumferential direction and covered with an insulator to detect the theft sign breakage.

[0015] In this cable anti-theft device, the theft sign detection conductive wire and the cable may be exposed near both ends of the cable.

[0016] In this 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.

[0017] It is even more preferable that this cable anti-theft device be one in which the detection circuit and the notification circuit are connected via a switch circuit via a relay circuit that energizes the circuit to emit the break signal upon detection of the break.

[0018] In this cable anti-theft device, a delay circuit for preventing erroneous activation may be connected to the activation circuit.

[0019] The cable anti-theft device may include a deactivation timer or deactivation circuit connected to the activation circuit. [Effects of the Invention]

[0020] The cable theft prevention device of the present invention detects signs of theft before the core wire of the cable itself is cut by the theft, and can give psychological pressure to make the thief give up the theft while it takes time to cut the core wire, or can send a security guard to catch the thief.

[0021] This cable theft prevention device can be installed on an existing cable after the fact, and because it has a simple configuration, it can be easily installed using the current cable installation method.

[0022] This cable anti-theft device can be selectively installed inexpensively and efficiently at locations where the cable is likely to be cut during theft, making it highly cost-effective.

[0023] This cable anti-theft device can reliably detect signs of theft and does not cause false activation of alarm devices or the like. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a schematic perspective view showing a theft sign detection conductive wire and its connection destination, which are part of a cable theft prevention device to which the present invention is applied, and a cable to be theft prevention target. [Figure 2] 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. [Figure 3] FIG. 10 is a circuit diagram of another embodiment of an anti-theft device for a cable to which the present invention is applied. [Figure 4] 10 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. [Figure 5] 10 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. [Figure 6] FIG. 1 is a schematic diagram showing the basic configuration of a conventional solar power plant. DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, embodiments for carrying out the present invention will be described in detail, but the scope of the present invention is not limited to these embodiments.

[0026] One embodiment of the cable theft prevention device of the present invention will be described with reference to Figure 1, which is a schematic perspective view showing the theft prediction detection conductive wire that forms part of it, its connection destination, and the trunk cable that is the object to be prevented from theft, and Figure 2, which is a block diagram showing an outline of the configuration.

[0027] As shown in FIG. 1, the cable anti-theft device 10 is used to prevent theft of a cable 1, such as a trunk cable, which is made by bundling multiple electric wires 3, each having a metal core wire 2a made of multiple twisted metal wires such as copper wires and covered with an insulating layer 2b, with a restraining tape 4 or restraining thread (not shown) and covering the cable with a sheath 5, by detecting a theft-premonition disconnection caused by the cutting of a theft-premonition detection conductive wire before the metal core wire 2a of the cable 1 is cut.

[0028] As shown in FIG. 2, the cable anti-theft device 10 comprises a power supply 20 for driving the cable anti-theft device 10 itself, a time meter 24 connected to the power supply 20 as needed and switching ON / OFF according to time periods, and a theft sign detection conductive wire 6 attached in parallel with the cable 1 near the exposed part of the cable 1, extending to a range where a theft sign disconnection should be detected and folded back, for detecting a theft sign disconnection 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. a 6 b 6 c ...and theft detection conductive wire 6 connected to the power supply a 6 b 6 c One end side of 6 a1 6 b1 6 c1 Other end side 6 a2 6 b2 6 c2the detection circuits 30a, 30b, 30c, etc., which are connected to each other by ... and detect a wire break that indicates a theft by a change in voltage and / or current based on the wire break that indicates a theft; a notification circuit 40, which is connected to the detection circuits 30a, 30b, 30c, etc., and issues a wire break signal based on the detection of the wire break that indicates a theft; a delay circuit 50, which is connected to the notification circuit 40 as needed to prevent malfunction; an operation circuit 60, which is connected to the notification circuit 40 or the delay circuit 50 installed as needed, and which operates at least one security device 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, which is connected to the operation circuit 60 as needed, and which stops the operation of the security device 90 when the risk of theft is averted after the detection of a sign of the theft.

[0029] The cable theft prevention device 10 detects the theft sign detection conductive wire 6 on the outer periphery of the cable before the thief cuts the metal core wire 2a in the cable 1 when the thief steals the cable 1. a 6 b 6 c ...is cut first, so it can be detected as a sign of theft before the cable is actually stolen.

[0030] Theft detection conductive wire 6 a 6 b 6 c ... is, for example, an enameled wire. An enameled wire is a 0.025 to 3.2 mm diameter soft copper wire or alumina wire with an insulating coating of varnish containing a polymer compound, approximately 0.003 to 0.035 mm thick, baked on it. Examples of polymer compounds include polyvinyl formal, polyurethane, polyamide-imide, polyester, and polyamide. Theft detection conductive wire 6 a 6 b 6 c If the wire is thinner than this range, it may be accidentally cut and cause a malfunction. If the wire is thicker than this range, a thief may a 6 b 6 c Since the system recognizes ..., there is a risk that this part will be avoided and only cable 1 will be cut, making it impossible to detect the break that is a sign of theft.

[0031] Theft detection conductive wire 6 a 6 b 6 c ...is a theft detection conductive wire 6 a 6 b 6 c To avoid cutting the cable 1 by avoiding the ..., the color may be the same or similar to the insulating layer 2b and / or sheath 5 that covers the metal core wire 2a in the electric wire 3, or it may be a conspicuous color different from the insulating layer 2b and / or sheath 5 so that a thief will recognize that the cable's anti-theft device 10 is activated and will give up on theft.

[0032] Each of the theft warning detection conductive wires 6a, 6b, 6c, etc. is individually connected to a detection circuit 30a, 30b, 30c, etc., so that when at least one of the theft warning detection conductive wires 6a, 6b, 6c, etc. is intentionally cut, the detection circuits 30a, 30b, 30c, etc. detect a change in the current and / or voltage flowing through the theft warning detection conductive wires 6a, 6b, 6c, etc., and it becomes possible to detect at which end of which cable the cable cutting is about to begin.

[0033] More specifically, the cable anti-theft device 10 is configured with a circuit as shown in FIG.

[0034] A power supply 20, for example a 100V commercial alternating current (AC) power supply, is used as the power source for the cable anti-theft device 10. A wattmeter 21 and a fuse 22 are connected to the power supply 20. No-fuse breakers (NFB) 23a and 23b are also connected to the power supply 20, and an hour meter 24, which is controlled to turn on and off as needed so that the anti-theft device 10 is stopped only when a security guard or worker is present, is connected to the power supply 20, and a fuse 25, a wattmeter 26, and a reset circuit 27 are connected as needed.

[0035] The power supply 20 is connected to one end 6 of the theft detection conductive wires 6a, 6b, 6c, etc. a1 6 b1 6 c1The other end of each theft detection conductive wire 6a, 6b, 6c, a2 6 b2 6 c2 are connected to the detection circuits (X1) 30a, (X2) 30b, and (X3) 30c.

[0036] The theft detection conductive wires 6a, 6b, 6c, etc. are attached near the end of a trunk cable 106 (see FIG. 6), for example, as cable 1. This trunk cable 106 is made up of a plurality of electric wires 3, each of which has a metal core 2 made of twisted metal wires 2a and covered with an insulating layer 2b, bundled with holding tape 4 and covered with a sheath 5 (see FIG. 1), and is buried underground or in a trench or protected by a tube except for the vicinity of the end, and is connected to a solar power collecting panel in a terminal box 105 via cable terminal 106a, and is also connected to a DC collecting panel in a collecting box 107 via cable terminal 106b (see FIG. 6). Since the terminal box 105 and the assembly box 107 are installed on the ground (not shown), the vicinity of these cable terminals 106a and 106b protrude 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, and the metal core wire 2a is connected to these assembly boards inside the terminal box 105 and the assembly box 107. Such exposed electric wire 3 portions of the cable 106 are easy places for thieves to cut.

[0037] Therefore, the theft detection conductive wires 6a, 6b, 6c... are attached along the cable longitudinal direction to the insulating layer 2b on the metal core wire 2a in the exposed electric wire 3 of the trunk cable 106 as this type of cable 1 (see FIG. 1). The theft detection conductive wires 6a, 6b, 6c... may be attached to the insulating layer 2b on the metal core wire 2a and installed within the holding tape 4, holding thread, or sheath 5, or they may be attached and installed on the holding tape 4, holding thread, or sheath 5, and may be used as appropriate. For example, of the theft detection conductive wires 6a, 6b, 6c..., the theft detection conductive wire 6a is attached along the cable longitudinal direction to the exposed portion of the insulating layer 2b on the metal core wire 2a in the electric wire 3. The theft detection conductive wire 6a is preferably attached near the cable terminals 106a and 106b (see FIG. 6), which is the range where theft-prevention disconnection should be detected, for example, over several meters from the cable terminals 106a and 106b to the point where the cable begins to be buried underground, buried in a trench, or protected by a tube, or if necessary, over the entire cable 1. The theft detection conductive wires 6b, 6c, etc. are also attached to the exposed portion of the insulating layer 2b on the metal core wire 2a in the electric wire 3.

[0038] The detection circuits (X1) 30a, (X2) 30b, (X3) 30c... are connected in parallel and then in series with the first switch circuits (X1) 32a, (X2) 32b, (X3) 32c... when they are turned on. 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, etc. detects a break in the theft warning detection conductive wire 6a, 6b, 6c, etc., a relay circuit (not shown) recognizes the break signal and turns off the corresponding first switch circuit (X1) 32a, (X2), 32b, (X3), 32c, etc. In response, when the current is interrupted, the notification circuit (X6) 40a is activated. The notification circuit (X6) 40a is connected to another relay circuit (not shown) so that when it detects a theft warning break, it turns on another switch circuit (X6) 41a.

[0039] The detection circuits (X1) 30a, (X2), 30b, (X3), 30c, etc. are connected in parallel with the second switch circuits 34a, 34b, 34c, etc., when they are turned off. When the first switch circuits (X1) 32a, (X2), 32b, (X3), 32c, etc. are turned off, the first switch circuits (X1) 32a, (X2), 32b, (X3), 32c, etc. and the second switch circuits 34a, 34b, 34c, etc. are connected by relay circuits or self-holding circuits (not shown) that are linked together so that the corresponding second switch circuits 34a, 34b, 34c, etc. are turned on. When any of the second switch circuits 34a, 34b, 34c, etc. is turned ON, and current flows through at least one of the second switch circuits 34a, 34b, 34c, etc., the notification circuit (X7) 40b operates in response. 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 wire break that is a sign of theft.

[0040] Although the figure shows an example in which the first switch circuits (X1) 32a, (X2) 32b, (X3) 32c, etc. and the second switch circuits 34a, 34b, 34c, etc. are connected in parallel, it is also possible to use the first switch circuits (X1) 32a, (X2) 32b, (X3) 32c, etc. but not use the second switch circuits 34a, 34b, 34c, etc.

[0041] If necessary, the notification circuit 40c may be connected via a relay circuit to either a notification circuit (X6) 40a that notifies the next device of a wire break that is a sign of theft when at least one of the first switch circuits (X1) 32a, (X2), 32b, (X3), 32c, etc. is turned OFF, or a notification circuit (X7) 40b that notifies the next device of a wire break that is a sign of theft when at least one of the second switch circuits 34a, 34b, 34c, etc. is turned ON. In this case, the notification circuit (X8) 40c is connected via a relay circuit (not shown) so that when the notification circuit (X6) 40a or the notification circuit (X7) 40b detects a wire break that is a sign of theft, the notification circuit (X8) 41c turns 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.

[0042] Even if these notification circuits (X6) 40a, (X7), 40b, and (X8) 40c are activated, a delay circuit (T1) 50a may be provided in parallel with the first switch circuits (X1) 32a, (X2), 32b, and (X3) 32c and the second switch circuits 34a, 34b, and 34c, as necessary, to prevent malfunctions due to voltage fluctuations, voltage drops, voltage interruptions, or voltage blackouts, regardless of whether the theft detection conductive wires 6b, 6c, or other disconnections have been detected. The delay circuit (T1) 50a is designed to turn on another switch circuit (T1) 51a via a relay circuit if the notification circuit (X6) 40a continues to operate for a predetermined time, e.g., 1 to 60 seconds, after it has started operating.

[0043] An actuation circuit 60, which is a flicker relay (FR) circuit, is provided in parallel with and ahead of the notification circuits (X6) 40a, (X7) 40b, the first switch circuits (X1) 32a, (X2) 32b, (X3) 32c, etc., the second switch circuits 34a, 34b, 34c, etc., 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 current flows and the devices are activated when another switch circuit (X6) 41a or (X7) 41b and another switch circuit (T1) 51a are turned ON.

[0044] The alarm device 91b is, for example, a speaker that issues a warning sound or message to thieves. 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., where a thief is attempting to steal, a tracking light that uses a camera to track and illuminate a moving target such as a thief, a rotating light, or a patrol light (registered trademark). The security device 90 may be a disconnection signal receiving terminal 91c that notifies the security company, management company, or owner of the commercial solar power plant using the cable 1, or the police, or may be 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-extinguisher that turns off street lights that illuminate the area around the cable 1 at night, making it difficult for thieves to move in the dark.

[0045] As shown in FIG. 1, the theft detection conductive wires 6a, 6b, 6c, etc. are attached parallel to the cable. However, as shown in FIG. 4, in addition to or instead of being attached parallel to the cable, a single annular theft detection conductive wire 7a may be used 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 to switch circuits 33a and 35a via a relay circuit. Multiple annular theft detection conductive wires 7a may also be arranged side by side. This allows theft attempts, such as pulling apart the metal core wire 2a and the electric wire 3 covered with the insulating layer 2b, to be detected as a disconnection (see FIG. 3).

[0046] 5, the cable may be spirally wound with a theft sign detection conductive wire 8a, with one end 8a1 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).

[0047] The operation of the cable anti-theft device 10 will now be described with reference to FIG.

[0048] First, power supply 20 is turned on to activate cable anti-theft device 10. At this time, hour meter 24 is set to keep cable anti-theft device 10 in the ON state. Meanwhile, hour meter 24 is set to keep cable anti-theft device 10 in the OFF state for a predetermined period of time so that it will not be detected as an unexpected break in the cable that is a sign of theft, even if power is intentionally turned off during work so that monitoring or work can be carried out only while a supervisor or worker is present.

[0049] First, when the cable anti-theft device 10 is turned on, a current flows through the theft sign detection conductive wires 6a, 6b, 6c, . . .

[0050] 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. determine that there is no theft warning wire break, and the first switch circuits (X1) 32a, (X2), 32b, (X3), 32c, etc. do not operate. As a result, the switch circuits (X1) 32a, (X2), 32b, (X3), 32c, etc. all remain ON, and current is flowing. Because current is flowing, the notification circuit (X6) 40a determines that there is no theft warning wire break. As a result, the switch circuit (X6) 41a does not operate and remains OFF. Meanwhile, the second switch circuits 34a, 34b, 34c, etc. all remain OFF, and no current flows. Since no current flows through the notification circuit (X7) 40b, it determines that there is no wire breakage that signals theft. As a result, the switch circuit (X7) 41b does not operate and remains OFF.

[0051] 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, and therefore the security devices 90, such as the alarm device 91b, the warning lighting device 91a, and the disconnection signal receiving terminal 91c, do not operate.

[0052] When a thief begins to cut the cable 1 at the exposed portion of the insulating layer 2b on the metal core 2a of the electric wire 3, one of the theft warning detection conductive wires 6a, 6b, 6c, etc., such as the theft warning detection conductive wire 6a, is first cut and broken before the metal core 2a of the electric wire 3 of the cable 1 is cut. This prevents current from flowing to the detection circuit (X1) 30a, which determines that a theft warning disconnection has occurred and switches the first switch circuit (X1) 32a from ON to OFF via a relay circuit (not shown). As a result, the notification circuit (X6) 40a switches the switch circuit (X6) 41a ON via the relay circuit, thereby energizing the switch circuit (X6) 41a. Meanwhile, when the first switch circuit (X1) 32a switches OFF, the second switch circuit 34a switches ON. As a result, the notification circuit (X7) 40b switches the switch circuit (X7) 41b ON via the relay circuit, thereby energizing the switch circuit (X7) 41b.

[0053] If the notification circuit (X6) 40a continues to operate for a predetermined time, for example, 1 to 60 seconds, preferably 2 to 10 seconds, after it starts operating, it is determined that there is no malfunction and another switch circuit (T1) 51a is turned ON via the relay circuit, causing electricity to flow.

[0054] When the notification circuit (X8) 40c, which is a backup circuit, is activated, the switch circuit (X8) 41c is turned on and is energized.

[0055] When the switch circuit (X6) 41a, the switch circuit (X7) 41b, the switch circuit (T1) 51a, and the switch circuit (X8) 41c, which is provided as needed, are turned ON, current flows to the operating circuit 60, which is a flicker relay circuit, and the operating circuit 60 operates, causing the security devices 90, such as the alarm device 91b, the warning lighting device 91a, and the disconnection signal receiving terminal 91c, to operate.

[0056] The security device 90 is preferably installed in a high place such as a utility pole or a tower so as to prevent it from being destroyed by thieves.

[0057] For example, the alarm device 91b may emit a loud siren-like warning sound from its speaker at the thief, or a warning message that the thief will be notified if the theft is not stopped immediately, thereby giving the thief a sense of crisis and discouraging him from continuing the theft.

[0058] Alternatively, the warning lighting device 91 uses an operating circuit 60 to recognize which cable 1 is near the theft sign detection conductive wire 6a that the thief is trying to steal, and then uses a searchlight to illuminate 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 and making him give up on continuing the theft.

[0059] Alternatively, 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 make him give up on continuing the theft.

[0060] Alternatively, the operating circuit 60 can recognize which cable 1 is near the theft sign detection conductive wire 6a that the thief is attempting to steal, and then report where in the vast solar power plant the theft is about to occur to the solar power plant's security company, management company, owner company, or police by wireless or wired means, or to the cell phone or tablet carried by the monitor or security guard via the Internet or wirelessly. This allows security guards or police officers to rush to the scene immediately, which can lead to the arrest of the thief.

[0061] 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 situation 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 discourage them from continuing the theft.

[0062] If necessary, the security device 90 can be used as a streetlight extinguisher that turns 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, thereby buying time for security guards or others to arrive and capture the thief.

[0063] Once theft has been avoided after detecting signs of theft, 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.

[0064] 2 and 3 show an example in which the theft detection conductive wires 6a, 6b, 6c, etc. are each connected to the detection circuits (X1) 30a, (X2) 30b, (X3) 30c, etc. However, the theft detection conductive wires 6a, 6b, 6c, etc. may be connected together into a single wire and connected to only one detection circuit (X1) 30a. In this case, when any of the theft detection conductive wires 6a, 6b, 6c, etc. is cut, a change in voltage or current occurs, which can be detected by the detection circuit (X1) 30a. This simplifies the configuration of the cable anti-theft device 10.

[0065] In the above example, a thief cuts the exposed portion of the insulating layer 2b on the metal core wire 2a in the electric wire 3. However, if such an exposed portion is housed in a terminal box 105 or a collection 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.

[0066] The multiple theft warning detection conductive wires 6a, 6b, 6c, etc. may be arranged at uneven intervals, but if they are arranged at equal intervals, one of the theft warning detection conductive wires 6a, 6b, 6c, etc. will break regardless of the direction from which cutting of the cable 1 is initiated. The cable anti-theft device 10 may also use a deactivation timer instead of a deactivation circuit connected to the activation circuit.

[0067] Although an example has been given in which a thick-diameter trunk cable 106 is targeted as the cable 3, the cable anti-theft device 10 can also be used for a thin-diameter cable connecting solar panel modules 102 together within the array 103, or for a thin-diameter cable 104 connecting the array 103 to the solar power collector panel of the terminal box.

[0068] Furthermore, the trunk cable anti-theft device 10 can also be used for cables at a construction site, such as a building constructed of reinforced concrete and where main electrical cables are being installed. In this case, once the construction of the building is complete, the trunk cable will no longer be stolen, so the cable anti-theft device 10 may be made removable and reused. [Industrial Applicability]

[0069] The cable theft prevention device of the present invention is attached to cables to be prevented 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. [Explanation of symbols]

[0070] 1 is a cable, 2a is a metal core wire, 2b is an insulating layer, 3 is an electric wire, 4 is a holding tape, 5 is a sheath, 6 a 6 b 6 c ...and 7 a 8 a Theft detection conductive wire, 6 a1 6 b1 6 c1 ...and 7 a1 8 a1 is one end of the theft detection conductive wire, 6 a2 6 b2 6 c2 ...and 7 a2 8 a2indicates 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 wattmeter, 22 is a fuse, 23a and 23b are no-fuse breakers, 24 is an hour meter, 25 is a fuse, 26 is a wattmeter, 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. 10 is a switch circuit, 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-diameter cable, 104a and 104b are cable terminals, 105 is a terminal box, 106 is a thick-diameter main cable, 106a and 106b are cable terminals, 107 is a collection box, and 108 is a DC to AC converter.

Claims

1. a plurality of theft detection conductive wires disposed 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 that detects a break in the cable based on a change in voltage or current of the theft-premonition detection conductive line due to an initiation of intentional cutting of the cable; a notification circuit that issues a disconnection signal based on the detection of the disconnection; The device has an operating circuit that operates a first security device consisting of a drone in response to the disconnection signal, or operates the first security device and at least one second security device consisting 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 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 is made up of 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 that surrounds the cable.

1. A cable theft prevention device comprising:

2. The cable theft prevention device according to claim 1, characterized in that the drone is equipped with a speaker and / or a camera.

3. The cable theft prevention device according to claim 1, wherein the drone is remotely controlled.

4. 2. The anti-theft device for a cable according to claim 1, wherein the theft sign detection conductive wire and the cable are exposed near both ends of the cable.

5. 2. The anti-theft device for a cable according to claim 1, wherein the plurality of theft sign detection conductive wires are connected to individual detection circuits or are connected together to one detection circuit.

6. 2. The cable theft prevention device according to claim 1, wherein a delay circuit for preventing erroneous operation is connected to said activation circuit.

7. 2. The cable anti-theft device according to claim 1, further comprising a stop timer or a stop circuit connected to said activation circuit.

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