Cable anti-theft device

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 to capture the thief, and makes the thief 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 occurs when the cable 1 is intentionally cut; detection circuits 30a, 30b, 30c, etc. 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.

Description

[Technical field]

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

[0002] 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 1000kW or more and high-voltage solar power plants with a capacity of 50kW or more, have been established.

[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 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, electricity is collected and voltage is made uniform in a terminal box 105 equipped with a solar power assembly board via cable terminals 104a and 104b using a thin cable 104 made of a twisted metal core wire such as copper having excellent conductivity, and the electricity is collected from each terminal box 105 via cable terminals 106a and 106b using a thick trunk cable 106 in which a plurality of twisted metal core wires made of copper are bundled and covered with a sheath, and buried underground, buried in a trench, or protected by a tube. The electricity is then combined in an assembly box 107 equipped with a DC assembly board via cable terminals 106a and 106b, and is converted to AC through a DC-AC converter 108, also called a power conditioner (PCS), and supplied.

[0004] 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. This, combined with the fact that the price of metals, especially copper, has been rising sharply, has resulted in trunk cables being stolen annually to the tune of tens of billions of yen, with thieves aiming to resell the copper core wires in larger cables rather than smaller cables, and thus stealing large amounts of copper from larger cables at one time.

[0005] The relevant government agencies, police, and non-life insurance companies have issued warnings about the frequent occurrence of thefts in which trunk cable 106 is cut near cable terminals 106a and 106b, which are exposed above ground and have their sheaths stripped off in order to be connected to terminal box 105 and assembly box 107, and the entire trunk cable 106 is taken away.

[0006] Similarly, at construction sites, such as buildings constructed of reinforced concrete and under construction 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 that is used for crime prevention, and has "a first power supply means for supplying a first current to a conductor, sounding means for issuing an alarm, a second power supply means for supplying 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 an 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, and the sounding means sounds 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, and in remote mountain areas, thieves may take advantage of the fact that security guards cannot arrive immediately and continue their theft, stealing the cut main cable, which can lead to further 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 which detects signs of cable cutting before the cable itself is cut, issues a warning to the thief, contacts various security stations, and captures the thief, causing the thief to give up the theft before the cable is cut. [Means for solving the problem]

[0010] The cable theft prevention device achieved in order to achieve the above object is 、 metal core wire of Covered with an insulating layer It becomes electric wire of Multiple A few bunches Sleeping Cable The multiple A number of theft detection conductive wires, The theft prediction detection conductive line associated with the start of intentional cutting of the cable Based on theft warning signs Ta Voltage or A detection circuit that detects a disconnection based on a change in current; a notification circuit that issues a disconnection signal based on the detection of the disconnection; The disconnection signal is transmitted to the disconnection signal receiving terminal, the monitoring device, the alarm device, the warning lighting device, the recording device, and Street light extinguisher At least one of the following security devices and an actuation circuit for actuating the And, 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:

[0011] In this cable anti-theft device, the plurality of theft detection conductive wires are preferably arranged at equal intervals along the cable.

[0012] The cable anti-theft device may further include a separate theft sign detection conductive wire that is attached in the circumferential direction of the cable, detects the theft sign breakage, and is covered with an insulator and has one or more turns.

[0013] The anti-theft device for this cable is Both ends of the cable The theft prediction detection conductive wire and the cable may be exposed near a portion of the theft prediction detection conductive wire and the cable.

[0014] This cable anti-theft device is before Note Multiple Theft detection conductive wire but, Individual Detection circuit Connected to One detection circuit has one The circuits may be connected together.

[0016] In this cable anti-theft device, a delay circuit for preventing false activation may be connected to the activation circuit.

[0017] The anti-theft device of this cable is a stop timer connected to the activation circuit. or It may also have a stop circuit. Effect of the Invention

[0018] The cable theft prevention device of the present invention detects signs of theft before the cable core wire itself is cut by the thief, and can give psychological pressure to the thief to give up the theft while it takes time to cut the core wire, or can dispatch a security guard to capture the thief.

[0019] This cable theft prevention device can be retroactively installed on an existing cable, and because it has a simple configuration, it can be easily installed using the current cable installation method.

[0020] This cable anti-theft device can be selectively, inexpensively and efficiently installed at locations where the cable is likely to be cut during theft, making it highly cost-effective.

[0021] This cable anti-theft device can reliably detect signs of theft and does not cause false activation of alarm devices or the like. [Brief description of the drawings]

[0022] [Figure 1]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. [Diagram 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; [Diagram 3] FIG. 11 is a circuit diagram of another embodiment of an anti-theft device for a cable to which the present invention is applied. [Figure 4] 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. [Diagram 5] 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. [Figure 6] FIG. 1 is a schematic diagram showing a basic configuration of a conventional solar power plant. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] 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.

[0024] One embodiment of the cable anti-theft device of the present invention will be described with reference to Figure 1, which is a schematic oblique view showing a theft sign detection conductive wire that forms part of it, its connection destination, and a trunk cable that is the object to be prevented from theft, and Figure 2, which is a block diagram showing the general configuration.

[0025] 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 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 restraining thread (not shown) and covering it with a sheath 5, by detecting theft-premonition disconnection by cutting the theft-premonition detection conductive wire before the metal core wire 2a of the cable 1 is cut.

[0026] 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 which is connected to the power source 20 as necessary and switches ON / OFF according to time periods, and a theft sign detection conductive wire 6 which is attached in parallel with the cable 1 near the exposed part of the cable 1, extends to a range where a theft sign disconnection should be detected and is folded back, and detects a theft sign disconnection around the terminal of the cable 1 prior to the start of cutting of the cable 1 itself when the theft of the cable 1 starts. 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 6, the other end of a2 6 b2 6 c2 the detection circuits 30a, 30b, 30c, etc., which are connected to the detection circuits 30a, 30b, 30c, etc. and detect a wire break that is a sign of the theft from 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, etc., 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.

[0027] The cable theft prevention device 10 detects the theft sign detection conductive wire 6 on the outer periphery of the cable 1 before the thief cuts the metal core wire 2a in 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.

[0028] Theft Prevention Electromagnetic Wire 6 a 6 b 6 c The wires are, for example, enameled wires. Enameled wires are made by baking an insulating coating of varnish made of a polymeric compound with a thickness of about 0.003 to 0.035 mm onto soft copper wire or alumina wire with a diameter of 0.025 to 3.2 mm. Examples of the polymeric compound include polyvinyl formal, polyurethane, polyamide-imide, polyester, and polyamide. Theft Prediction 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 accidentally cut the wire. a 6 b 6 c Since the security camera recognizes ..., there is a risk that this part will be avoided and only cable 1 will be cut, making it impossible to detect the breakage that is a sign of theft.

[0029] Theft Prevention Electromagnetic Wire 6 a 6 b 6 c ...is a theft detection conductive wire 6 a 6 b 6 c In order 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 covering the metal core wire 2a in the electric wire 3, or the color may be intentionally made a conspicuous color different from the insulating layer 2b and / or sheath 5 so that a thief would recognize that the cable's anti-theft device 10 is activated and would give up on theft.

[0030] Each of the theft sign detection conductive wires 6a, 6b, 6c, etc. is individually connected to the detection circuits 30a, 30b, 30c, etc., so that when at least one of the theft sign detection conductive wires 6a, 6b, 6c, etc. is intentionally cut, the detection circuits 30a, 30b, 30c, etc. can detect a change in the current and / or voltage flowing through the theft sign detection conductive wires 6a, 6b, 6c, etc., and thereby it becomes possible to detect at which end of which cable the cable cutting is about to begin.

[0031] More specifically, the cable anti-theft device 10 is configured with a circuit as shown in FIG.

[0032] A power source 20, for example a 100V commercial alternating current power source (AC power source), 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 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 / off as necessary so as to stop the operation of the anti-theft device 10 only when a security officer or worker is present is connected, and a fuse 25, a wattmeter 26, and a reset circuit 27 are connected as necessary.

[0033] One end 6 of the theft detection conductive wires 6a, 6b, 6c... a1 6 b1 6 c1 The other end of each of the theft detection conductive wires 6a, 6b, 6c is branched at 6 a2 6 b2 6 c2 are connected to detection circuits (X1) 30a, (X2) 30b, and (X3) 30c.

[0034] The theft prediction detection conductive wires 6a, 6b, 6c, etc. are attached near the end of a trunk cable 106 (see FIG. 6) as, for example, a cable 1. This trunk cable 106 is made up of a plurality of electric wires 3, each of which has a metal core wire 2 made of multiple twisted metal wires 2a and is covered with an insulating layer 2b, bound 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 a cable terminal 106a, and is also connected to a DC collecting panel in a collecting box 107 via a 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 are exposed 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 portion of the cable 106 is a place that is easy for a thief to cut.

[0035] Therefore, the theft detection conductive wires 6a, 6b, 6c, etc. are attached to the insulating layer 2b on the metal core wire 2a in the exposed electric wire 3 of the trunk cable 106 as such a cable 1 along the cable longitudinal direction (see FIG. 1). The theft detection conductive wires 6a, 6b, 6c, etc. may be attached to the insulating layer 2b on the metal core wire 2a and installed inside 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 wire 2a in the electric wire 3 along the cable longitudinal direction. 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 breakage should be detected, for example, over several meters from the cable terminals 106a and 106b to the part 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 sign detection conductive wires 6b, 6c, etc. are also attached to exposed parts of the insulating layer 2b on the metal core wire 2a in the electric wire 3.

[0036] The detection circuits (X1) 30a, (X2) 30b, (X3) 30c... are connected in parallel, and beyond them, the first switch circuits (X1) 32a, (X2) 32b, (X3) 32c... are connected in series 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., the corresponding first switch circuit (X1) 32a, (X2), 32b, (X3), 32c, etc. is turned OFF via a relay circuit (not shown) that recognizes the break signal. In response to this, when the current is cut off, the notification circuit (X6) 40a is activated. The notification circuit (X6) 40a is connected to a relay circuit (not shown) so that it turns ON another switch circuit (X6) 41a when it detects a theft warning break.

[0037] The detection circuits (X1) 30a, (X2) 30b, (X3) 30c... are connected in parallel with 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 together so that the corresponding second switch circuits 34a, 34b, 34c... are turned ON. When any of the second switch circuits 34a, 34b, 34c, etc. are turned ON, that is, when a 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 as to turn on another switch circuit (X7) 41b when it detects a theft-premonition wire break.

[0038] Although 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 is illustrated, 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.

[0039] If necessary, the notification circuit 40c may be connected to either the notification circuit (X6) 40a, which notifies the next device of the theft-premonition wire breakage 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 the theft-premonition wire breakage when at least one of the second switch circuits 34a, 34b, 34c, etc. is turned ON, via a relay circuit. In this case, 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 when the notification circuit (X6) 40a or the notification circuit (X7) 40b detects the theft-premonition wire breakage in response to the operation of either the notification circuit (X6) 40a or the notification circuit (X7) 40b. Therefore, even if the switch circuit (X7) 41b does not operate due to some malfunction and no current flows, the switch circuit (X8) 41c allows current to flow.

[0040] Even if these notification circuits (X6) 40a, (X7), 40b, (X8) 40c are activated, 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 malfunctions due to voltage fluctuations, voltage dips, voltage interruptions, and the like, regardless of the detection of breaks in the theft indication detection conductive wires 6b, 6c, etc. The delay circuit (T1) 50a is designed so that another switch circuit (T1) 51a is turned ON via a relay circuit when the notification circuit (X6) 40a continues to operate for a predetermined time, for example, 1 to 60 seconds, after it starts operating.

[0041] 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,..., 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 a warning lighting device 91a and an alarm device 91b, so that a current flows and the device is actuated when another switch circuit (X6) 41a or (X7) 41b and another switch circuit (T1) 51a are turned ON.

[0042] 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 target such as a moving 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, or owner company 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 be a light-out device that turns off street lights that illuminate the area around the cable 1 at night, making it difficult for a thief to act in the dark.

[0043] As shown in Fig. 1, the theft sign detection conductive wires 6a, 6b, 6c, etc. are attached in parallel to the cable. However, as shown in Fig. 4, in addition to or instead of being attached in parallel to the cable, a single annular theft sign 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 connected to the switch circuits 33a and 35a via a relay circuit. A plurality of annular theft sign detection conductive wires 7a may be arranged in a row. This allows theft to be detected as a theft sign disconnection even when the metal core wire 2a pulls apart the electric wire 3 covered with the insulating layer 2b (see Fig. 3).

[0044] Also, as shown in Fig. 5, the cable may be wound in a spiral shape as the 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 disconnection to be detected by a single detection circuit 31a (see Fig. 3).

[0045] The operation of the cable anti-theft device 10 will now be described with reference to FIG.

[0046] First, the power supply 20 is turned on to activate the cable anti-theft device 10. At this time, the hour meter 24 is set to keep 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 cable that is a sign of theft, even if the power is intentionally turned off during work so that monitoring or work can be performed only while a supervisor or worker is present.

[0047] First, when the cable anti-theft device 10 is turned on, a current flows through the theft sign detection conductive wires 6a, 6b, 6c, . . .

[0048] 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 flows. The notification circuit (X6) 40a determines that there is no theft warning wire break, because current is flowing. As a result, the switch circuit (X6) 41a does not operate, and remains OFF. On the other hand, the second switch circuits 34a, 34b, 34c, etc. all remain OFF, and the current is cut off. The notification circuit (X7) 40b determines that there is no disconnection due to the absence of current, and as a result, the switch circuit (X7) 41b does not operate and remains OFF.

[0049] 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.

[0050] When a thief starts to cut the cable 1 at an exposed portion 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 disconnected 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 disconnection, 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 to allow current to flow. On the other hand, when the first switch circuit (X1) 32a turns OFF, the second switch circuit 34a turns ON. As a result, the notification circuit (X7) 40b turns ON the switch circuit (X7) 41b via the relay circuit to allow current to flow.

[0051] 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.

[0052] When the notification circuit (X8) 40c, which is a backup circuit, is activated, the switch circuit (X8) 41c is turned ON and energized.

[0053] 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 necessary, are ON, electricity is supplied to the operating circuit 60, which is a flicker relay circuit, and the operating circuit 60 operates to operate security devices 90, such as an alarm device 91b, a warning lighting device 91a, and a disconnection signal receiving terminal 91c.

[0054] 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.

[0055] For example, 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 the thief will report the crime if the theft is not stopped immediately, thereby giving the thief a sense of danger and discouraging him from continuing the theft.

[0056] Alternatively, the warning lighting device 91 recognizes, by means of the operating circuit 60, which cable 1 is near the theft sign detection conductive wire 6a that the thief is trying to steal, and illuminates the vicinity of the cable 1 that is about to be cut with a searchlight or illuminates a target such as a moving thief with a tracking light that tracks the target with a camera, thereby scaring the thief away and making him give up continuing the theft.

[0057] 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 make him give up on continuing the theft.

[0058] 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 reports where in the vast solar power plant the theft is about to occur to the disconnection signal receiving terminal 91c of the solar power plant's security company, management company, owner company, or police by wireless or wired communication, or reports via the internet or wirelessly to the mobile phone or tablet of the monitor or security guard. This allows the security guard or police to rush to the scene immediately, leading to the arrest of the thief.

[0059] 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 of the thief and provide 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 him from continuing the theft.

[0060] If necessary, the security device 90 can be a streetlight extinguisher that turns off the streetlights that illuminate a solar power plant or a construction site at night, making it dark and making it difficult for a thief to commit a theft, and can also buy time for a security guard or the like to rush to the scene and capture the thief.

[0061] When the theft risk 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.

[0062] 2 and 3 show an example in which each of the theft sign detection conductive wires 6a, 6b, 6c, etc. is connected to the detection circuits (X1) 30a, (X2) 30b, (X3) 30c, etc., but the theft sign detection conductive wires 6a, 6b, 6c, etc. may be connected together into one wire and connected to only one detection circuit (X1) 30a. In this case, when any of the theft sign 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 can simplify the configuration of the cable anti-theft device 10.

[0063] In the above example, a thief cuts the exposed portion of insulating layer 2b on metal core wire 2a in electric wire 3. However, if such exposed portion is housed in terminal box 105 or assembly box 107 (see FIG. 6) which is difficult to destroy, anti-theft detection conductive wires 6a, 6b, 6c, etc. may be attached to sheath 5.

[0064] The multiple theft sign 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 sign detection conductive wires 6a, 6b, 6c, etc. will be broken 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.

[0065] Although an example has been given in which a thick trunk cable 106 is targeted as the cable 3, 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 and the solar power collector panel of the terminal box.

[0066] The anti-theft device 10 for the trunk cable can also be used for cables at a construction site, such as a building constructed of reinforced concrete and where the main electric cables are being installed. In this case, once the construction of the building has been completed, including the interior, the trunk cable will no longer be stolen, so the anti-theft device 10 for the cable may be made removable and reused. [Industrial Applicability]

[0067] The cable theft prevention device of the present invention is attached to cables to be prevented from being stolen 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 the cable is cut, thereby minimizing damage. [Explanation of symbols]

[0068] 1 is a cable, 2a is a metal core wire, 2b is an insulating layer, 3 is an electric wire, 4 is a retaining tape, 5 is a sheath, 6 a 6 b 6 c ...and 7 a 8 a 6 is theft detection conductive wire, a1 6 b1 6 c1 ...and 7 a1 8 a1 6 is one end of the theft detection conductive wire, a2 6 b2 6 c2 ...and 7 a2 8 a2indicates the other end of the theft prediction detection conductive wire, 10 indicates an anti-theft device of the cable, 20 indicates a power source, 21 indicates a wattmeter, 22 indicates a fuse, 23a and 23b indicate no-fuse breakers, 24 indicates an hour meter, 25 indicates a fuse, 26 indicates a wattmeter, 27 indicates a reset circuit, 30a, 30b, 30c, 30d,... and 31a indicate detection circuits, 32a, 32b, 32c, 32d,... and 33a, as well as 34a, 34b, 34c, 34d,... and 35a indicate switch circuits, 40, 40a, 40b, and 40c indicate notification circuits, 41a, 41b, and 41c indicate switch In the drawings, 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

1. 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. 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.

3. An anti-theft device for a cable as described in claim 1, characterized in that the multiple theft detection conductive wires are connected to individual detection circuits or connected together to a single detection circuit.

4. 2. The anti-theft device for a cable according to claim 1, further comprising a delay circuit connected to said activation circuit for preventing erroneous activation.

5. 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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