JP7012961B2 - Electric fence monitoring device - Google Patents

Description

The present invention relates to an electric fence monitoring device, and more particularly to an electric fence monitoring device in which a current measuring device is provided on the electric fence to identify a leaked or poorly energized part of the electric fence.

Electric fences are laid around the outer edge of areas that should be isolated from the outside as a measure to prevent the escape of grazing livestock and to prevent wild animals from invading cultivated land. The electric fence includes a plurality of posts (posts) erected on the ground at intervals, and conductive wires stretched over at predetermined intervals in the height direction of the posts. In this way, when the electric fence is stretched around the outer edge of the area to be isolated, the electric fence has a loop shape. On the other hand, in addition to the loop-shaped electric fence, there is also a line-shaped electric fence having a start point and an end point, and there is also an electric fence in which the fence branches in the middle of the start point and the end point and has a plurality of end points.

Posts are embedded in the ground at intervals of approximately 3-5 m. In addition, the number of wires stretched on the boss and the distance between the wires differ depending on the type of animal that is prevented from passing by the electric fence. Is stretched. Then, a high voltage is applied to the wire from the power supply device, and when the animal touches the wire, an electric shock can give the animal a feeling of psychological fear, so that the animal will not approach the electric fence thereafter. Such electric fences are cheaper than physical fences such as barbed wire, stone walls, and net fences, and can reliably prevent animals from moving over fences in recent years. It is widely used.

A power supply device that energizes a wire with a high voltage at regular time intervals is connected to a battery such as a 100 V AC power supply or a lead storage battery to supply the wire with a high voltage of several thousand volts. In recent years, some power supplies are connected to solar panels. The power supply has a power supply terminal and a ground terminal, the power supply terminal is connected to a wire, and the ground terminal is connected to a ground rod embedded in the ground. When the wire is connected to the power supply terminal of the power supply device, a high voltage (high voltage pulse) of several thousand volts, specifically 5000V to 8000V, is applied to the wire. If the post is conductive, the wires are laid and stretched over an insulating insulator attached to the post. Also, if the post is made of insulating material, the wires are stretched directly to the post.

The wire is laid so as to be insulated from the ground, and a voltage of several thousand volts is applied to the wire at a low frequency at regular intervals, for example, at intervals of 0.75 seconds or more. At this time, if the wire is completely isolated from the ground, the voltage of the wire fluctuates greatly, but the current value flowing through the wire does not occur or is extremely small. This is because a device operated by electricity applied to the wire is not connected to the tip of the wire, so that almost no current flows through the wire.

However, since the electric fence is installed outdoors, the wire may be broken due to wind, rain, fallen trees, and snowfall, and weeds growing on the ground may touch the wire and cause an electric leakage. When the wire is broken, no voltage is applied to the wire and the function of the electric fence is lost. When an electric leakage occurs in the wire, the voltage of the wire drops and the function of the electric fence is impaired. Other causes of impaired electric fence function include poor wire connection and poor wire continuity.

Therefore, there is a proposal to detect disconnection or leakage of the electric fence wire by monitoring the voltage applied to the electric fence wire (see, for example, Patent Document 1). In the voltage measuring device for an electric fence disclosed in Patent Document 1, the voltage measured by the voltage measuring unit is transmitted to an external voltage monitoring terminal by the wireless communication unit via a wireless LAN to monitor the voltage.

Patent No. 6161901

Japanese Unexamined Patent Publication No. 2011-30452

Japanese Unexamined Patent Publication No. 2009-14583

Utility model registration No. 3073508

However, in the method of detecting the disconnection or leakage of the electric fence wire proposed in Patent Document 1, when the voltage applied to the wire drops due to the electric leakage, the entire electric fence is connected to the wire, so that the wire of the entire electric fence is connected. The voltage drops. Therefore, even if there are a plurality of voltage measuring units on the electric fence, there is a problem that the same voltage drop signal is transmitted from many voltage measuring units at the same time, and the leakage point cannot be identified.

For example, consider a case where the first voltage sensor is located closest to the power supply device, the second voltage sensor is located at a predetermined distance from the first voltage sensor, and the third voltage sensor is provided at the farthest location. Even if there is no leakage in the wire, the wire has impedance, and the voltage drop occurs as the distance from the power supply device increases. Therefore, when the measured value of the first voltage sensor is 8000V, the measured value of the second voltage sensor is 7900V and the measured value of the third voltage sensor is 7800V. The voltage drop is large.

Here, an experiment was conducted assuming a case where electric leakage due to weeds occurred in the section between the second voltage sensor and the third voltage sensor, and the measured values of each voltage sensor were verified. The measurement results when the leakage was slight were that the measured value of the first voltage sensor was 7000 V, the measured value of the second voltage sensor was 6900 V, and the measured value of the third voltage sensor was 6800 V. Further, the measurement results when the leakage was increased were that the measured value of the first voltage sensor was 2000 V, the measured value of the second voltage sensor was 1900 V, and the measured value of the third voltage sensor was 1800 V. In this way, when an electric leakage occurs in the wire, the measured value of the voltage sensor decreases as the electric leakage increases, but the tendency of the voltage drop according to the distance from the power supply device is the same as when there is no electric leakage. The location of the occurrence could not be identified.

Further, due to the conductivity of the ground around the voltage sensor, the voltage measurement value of the voltage sensor far from the power supply device may be displayed higher. In addition to this, the voltage at the end far from the power supply of the electric fence may rise above the voltage at other parts due to the influence of reflected waves, making it difficult to identify the leakage point by monitoring only the voltage. rice field.

An object of the present invention is an electric fence capable of identifying a leakage point of a wire by measuring a current flowing through a wire of the electric fence when an electric leakage occurs in the electric fence regardless of whether it is a loop shape or a linear shape. Is to provide a monitoring device for.

According to one form, a plurality of posts erected on the ground at predetermined intervals, a conductive wire stretched over the multiple posts, and a wire connected to the wire in one place. An electric fence monitoring device equipped with a power supply that applies a high voltage and that gives an electric shock to an animal that touches the wire. At least two currents that measure the current flowing through the wire at a predetermined position. It is equipped with a measuring device and a management device that receives a signal transmitted from the current measuring device. The current measuring device includes a current sensor that measures the current flowing through the wire and a current measurement value measured by the current sensor in advance. A trigger signal generator that generates a trigger signal and inputs it to the transmitter when the set threshold is exceeded, and a transmitter that transmits the trigger signal and current measurement value to the outside when the trigger signal is input from the trigger signal generator. And, the trigger signal transmitted from another current measuring device is directly received, or the command signal from the management device that has received the trigger signal is received, and the received signal is input to the transmitting device of its own current measuring device. A receiving device for transmitting the current measured value measured by the current sensor of the current measuring device to the outside is provided, the management device is equipped with a display, and when the current measured value transmitted from each current measuring device is received, it is received. A monitoring device for an electric fence is provided, which is characterized in that a leakage point in the electric fence can be visually recognized by displaying a plurality of current measurement values on a display.

According to the electric fence monitoring device of the present invention, when an electric leakage occurs in the electric fence, if the current measurement values measured by each current measuring device are compared in the management device, the leakage point can be determined from the magnitude of the current measurement value. Can be identified. As a result, even if the voltage applied to the wire drops in the entire wire, there is an effect that the leakage point of the wire can be quickly identified. In addition, it becomes possible to accurately grasp the situation such as electric leakage and disconnection, and maintenance and maintenance can be performed promptly. Further, there is an effect that the seriousness of the electric leakage can be determined from the magnitude of the detected current change.

(A) is an explanatory diagram showing the structure of a general electric fence, and (b) is a structural diagram showing the detailed structure of the power supply portion of the electric fence shown in (a). (A) is an explanatory diagram showing the flow of electric current when an animal tries to invade the electric fence shown in FIGS. 1 (a) and 1 (b) and comes into contact with a wire and receives an electric shock. It is explanatory drawing which shows the flow of the electric current when the weed touches the electric fence shown in FIGS. 1A and 1B, and the electric leakage occurs. (A) is a plan view showing the structure of the first embodiment of the electric fence monitoring device of the present invention, and (b) is a block configuration diagram showing an example of the internal configuration of the current measuring device shown in (a). be. (A) is a perspective view showing the structure of an example of a current sensor used in the current measuring device shown in FIG. 3 (a), and (b) is a current used in the current measuring device shown in FIG. 3 (a). It is a perspective view which shows the structure of another example of a sensor. It is a top view which shows the structure of the 2nd Embodiment of the electric fence monitoring apparatus of this invention. It is a top view which shows the structure of the 3rd Embodiment of the electric fence monitoring apparatus of this invention. (A) is a block diagram showing a structural example of the current measuring device in the embodiment in which the voltage measuring device and the communication device are provided in the current measuring device, and (b) is a voltage measuring device independently provided in the monitoring device of the electric fence. It is a block diagram which shows the structural example of the voltage measuring apparatus of the said Example. It is a top view which shows the structure of the 4th Embodiment of the electric fence monitoring apparatus of this invention. It is a top view which shows the structure of the 5th Embodiment of the electric fence monitoring apparatus of this invention. (A) is a plan view showing the structure of the sixth embodiment of the electric fence monitoring device of the present invention, and (b) is a plan view showing the structure of the seventh embodiment of the electric fence monitoring device of the present invention. FIG. 3C is a plan view showing the structure of an eighth embodiment of the electric fence monitoring device of the present invention.

Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings based on specific examples. A conventional electric fence will be described as an example.

FIG. 1A shows the structure of a general electric fence 10. The electric fence 10 is installed to prevent wild animals A from invading the area R such as cultivated land from the outside and eating the cultivated crops. In the electric fence 10, a plurality of posts 1 are erected on the ground at predetermined intervals along the boundary of the region R isolated from the outside, and the conductive wires 2 are hung on the plurality of posts 1 and stretched. Will be set up. When the post 1 is made of metal or the like and has conductivity, the wire 2 is hung through an insulator such as an insulator. FIG. 1A shows a state in which the wire 2 is stretched on the post 1 erected along the boundary of the rectangular region R.

A power supply device 3 that applies a high voltage to the wire 2 is connected to the wire 2 stretched on the post 1 erected around the region R. Normally, the power supply device 3 is connected to the wire 2 at one connection point 4, but when a plurality of power supply devices 3 are connected to the wire 2 at a plurality of connection points 4, one wire of the power supply device 3 is connected. There may be a plurality of connection points 4 to 2. The power supply device 3 of this example is connected to an AC power supply 5, for example, a commercial power supply 5 of 100 V, and is converted into a high voltage (for example, 8000 V) pulsed alternating voltage inside the power supply device 3. The power supply device 3 has a + terminal 31 and a-terminal 32, and the + terminal 31 is connected to a connection point 4 with a wire 2 by a feeder line 34. Further, the-terminal 32 is grounded by the ground wire 35.

FIG. 1B shows a detailed structure of a connection portion between the power supply device 3 and the wire 2 of the electric fence 10 shown in FIG. 1A. The wire 2 is hung on the post 1 in a plurality of stages via a wire holder 6 such as an insulator, and the + terminal 31 of the power supply device 3 is a feeding line 34 and is a connection point to one of the plurality of stages of the wire 2. It is connected by 4. The wires 2 in the other stages that are not connected to the power supply device 3 are connected to the wires 2 connected to the power supply device 3 by the connection line 2A, and the same voltage is applied to the wires 2 in the plurality of stages. The power supply device 3 is erected on the ground G by a support column 8, and a ground rod 30 is embedded in the ground G in the vicinity of the power supply device 3. A required number of ground rods 30 are embedded in the ground rod 30 according to the power supply device 3, and each ground rod 30 is connected by a connecting rod 30C. The ground rod 30 is connected to the − terminal 32 of the power supply device 3 by the ground wire 35. Reference numeral 33 is an on / off switch of the power supply device 3.

FIG. 2A shows an electric shock when an animal A such as a wild boar tries to invade the region R from the outside and comes into contact with the wire 2 on the electric fence 10 shown in FIGS. 1A and 1B. It is explanatory drawing which shows the flow of the electric current of. For example, when the nose of the animal A touches the wire 2, a shocking pulse current flows from the nose of the animal through the body to the ground G as shown by a thick line. The current flowing through the ground G is recovered by the ground rod 30 and the ground wire 35, and returns to the power supply device 3. Animal A is shocked by this current path and cannot approach the electric fence 10 thereafter.

FIG. 2B is an explanatory diagram showing the current flow when the weed W growing on the ground G touches the electric fence 10 shown in FIGS. 1A and 1B and an electric leakage occurs. Weeds are manually removed from the area R such as cultivated land, but when weeds W grow outside the area R, the grown weeds W may touch the wire 2 of the electric fence 10. Then, a current flows from the wire 2 to the ground G through the weed W as shown by a broken line, and an electric leakage occurs from the ground rod 30 back to the power supply device 3. When an electric leakage occurs in the wire 2, the voltage of the wire 2 drops, and the animal exclusion ability of the electric fence 10 is impaired. Therefore, the present invention provides an electric fence monitoring device capable of reliably identifying an electric leakage location and removing the cause of the electric leakage when an electric leakage occurs in the electric fence 10 due to weeds W or the like.

FIG. 3A shows the structure of the first embodiment of the electric fence monitoring device 20 of the present invention. Since the structure of the electric fence 10 is the same as the structure of the general electric fence 10 described with reference to FIG. 1A, the same components are designated by the same reference numerals and the description thereof will be omitted. The electric fence 10 is provided with a plurality of posts 1 erected around the region R, wires 2 stretched over the plurality of posts 1, and a power supply device 3 for applying a high voltage to the wires 2. ..

In the first embodiment, current measuring devices 21 are provided at predetermined locations of the wire 2 stretched around the region R, for example, at four locations in this embodiment so that the current flowing through the wire 2 can be measured. I have to. The intervals at which the current measuring devices 21 are provided are arbitrary, but they can be provided at equal lengths of the wires 2. Further, the wire 2 is attached to the wire 2L of the first section located on the left side from the connection point 4 to the wire of the power supply device 3 to the position P which is electrically farthest from the wire, and the wire 2R of the second section located on the right side. When separated, at least one current measuring device 21 may be installed for each of the wire 2L in the first section and the wire 2R in the second section, and the number of installations differs between the first section and the second section. May be.

FIG. 3B shows an example of the structure of each current measuring device 21. The current flowing through the wire 2 is measured by the current sensor 21S. Inside the current measuring device 21, there are a trigger signal generator 22, a receiving device 23 and a transmitting device 24, and an antenna 7 is provided in the receiving device 23 and the transmitting device 24. It is connected.

The current measured value IM from the current sensor 21S is input to the trigger signal generator 22. A threshold value T is set in advance in the trigger signal generator 22, and the current measured value IM is compared with the threshold value T. The trigger signal generator 22 outputs the trigger signal TS when the input current measured value IM exceeds the threshold value T. The threshold value T is not a fixed value and may be changed. The trigger signal generator 22 does not output the trigger signal TS when the input current measurement value IM exceeds the threshold value T only once, but measures the current when the input current measurement value exceeds the threshold value T a plurality of times or continuously. The trigger signal TS can be output when the value IM continues to exceed the threshold value T. Further, when the current sensor 21S uses the H-type coil, the trigger signal TS can be output to the trigger signal generator 22 by the magnitude of the electric power generated by the H-type coil due to the current flowing through the wire at the time of electric leakage. .. Further, if the current flowing through the wire at the time of electric leakage is not so large, the power generated by the H-type coil is not large, so the power generated by the H-type coil is stored in a capacitor provided in the trigger signal generator 22 (not shown). When the electric power stored in the capacitor reaches a predetermined amount, the trigger signal generator 22 can output the trigger signal TS.

The trigger signal TS output from the trigger signal generator 22 is input to the transmission device 24. When the trigger signal TS is input to the transmission device 24, the transmission device 24 transmits the trigger signal TS and the current measurement value IM measured by the current sensor 21S to the outside together with the direction in which the current flows. A unique number is assigned to each current measuring device 21, and the transmitting device 24 also includes the unique number assigned to the current measuring device 21 when transmitting the trigger signal TS and the current measured value IM to the outside. Send. Although power is required when each current measuring device 21 transmits the trigger signal TS, the current measured value IM, and the unique number to the outside, it is possible to appropriately reduce the power consumption of each current measuring device 21. Since it can be done, the explanation is omitted here.

On the other hand, in the current measuring device 21 in which the current measured value IM measured by the current sensor 21S does not exceed the threshold value T, the trigger signal generating device 22 does not generate the trigger signal TS, so that the transmitting device 24 does not operate. Therefore, when the trigger signal TS, the current measurement value IM, and the unique number are transmitted from the trigger signal generation device 22 of at least one current measurement device 21, the other current measurement device 21 that does not transmit the trigger signal TS also also transmits the trigger signal TS, the current measurement value IM, and the unique number. If the current measurement value IM and the unique number are not transmitted, it is difficult to identify the leakage point of the wire. Therefore, when the trigger signal TS is transmitted from a certain current measuring device 21, the current measured value IM and the unique number are also transmitted from the other current measuring device 21 that has not transmitted the trigger signal TS.

In this case, the receiving device 23 of the other current measuring device 21 that has not transmitted the trigger signal TS can receive the trigger signal TS, and the other current measuring device 21 can transmit the current measured value IM and the unique number. Further, the management device 25 that has received the trigger signal TS transmits a command to transmit the current measurement value IM and the unique number to the other current measurement device 21 that has not transmitted the trigger signal TS, thereby transmitting the other current measurement device. It is also possible to have 21 transmit the current measurement value IM and the unique number. In this way, when at least one current measuring device 21 among the plurality of current measuring devices 21 transmits a transmission of the trigger signal TS together with the current measurement value IM and the unique number, the other current measurement that does not transmit the trigger signal TS is performed. The current measurement value IM and the unique number are also transmitted from the device 21 to the outside, and all of them are received by the management device 25.

The management device 25 compares the current measured values IM received from all the current measuring devices 21, and calculates the current value flowing through the wire 2 between the adjacent current measuring devices 21 from the comparison result. When the currents flowing through the two compared current measuring devices 21 have the same direction, the current value flowing through the wire 2 is the difference between the compared current measured values IM. On the other hand, when the currents flowing through the two compared current measuring devices 21 are in opposite directions, the current values flowing through the wire 2 are the sum of the compared current measured values IM. Since the position of the current measuring device 21 can be specified by the received unique number, the management device 25 can specify the place where the current value flowing through the wire 2 is large as the electric leakage point. The management device 25 can be configured to output an earth leakage alarm when the current measurement value IM is received from all the current measurement devices 21. Further, a display may be provided in the management device 25 to display which current measuring device 21 is connected to the wire 2 in which the electric leakage occurs. Further, when an electric leakage occurs, the management device 25 displays only the current measured value IM and the unique number from each current measuring device 21 on the display, and the manager who sees the display identifies the leakage point. It can also be.

FIG. 4A shows an example structure of the current sensor 21S used in the current measuring device 21 shown in FIG. 3A. In the current sensor 21S of this example, the magnetic core 41 is arranged around the cable 2, and the cable 2 penetrates the magnetic core 41. A winding 42 is wound around the magnetic core 41, and both ends of the winding 42 are connected by a resistor 43. When an alternating current flows through the cable 2, a magnetic flux is generated, and a current flows through the magnetic core 41, so that a voltage is generated across the resistor 43. By measuring this voltage, the AC current value flowing through the cable 2 can be measured.

FIG. 4B shows the structure of another example of the current sensor 21S used in the current measuring device 21 shown in FIG. 3A. In the current sensor 21S of this example, the magnetic core 41 is arranged around the cable 2, and the cable 2 penetrates the magnetic core 41. A Hall element 44 is incorporated in a part of the magnetic core 41, and the Hall element 44 converts a magnetic field generated around a current flowing through the cable 2 into a voltage by the Hall effect. Since the voltage output from the Hall element 44 is small (several tens of mV), the value of the current (direct current, alternating current, pulse current) flowing through the cable 2 can be measured by amplifying the voltage with the power supply 45 and the amplifier 46.

Further, although not shown, there are also a current measuring device in which an H-shaped coil is arranged in the vicinity of the cable and a current measuring device using an induced current generated in the H-shaped coil is provided, and a current measuring device in which a circuit directly connected to the cable is provided. Therefore, the current measuring device is not particular about the type as long as it can measure the current flowing through the wire.

FIG. 5 shows the structure of the second embodiment of the electric fence monitoring device 20 of the present invention, and the structure of the electric fence 10 is the same as the structure of the electric fence 10 described with reference to FIG. 3A. be. The second embodiment is different from the first embodiment in that the current measuring devices 21 are provided at six points of the wire 2 stretched around the region R. That is, in the second embodiment, the three current measuring devices 21 are provided on the wire 2L of the first section located on the left side from the connection point 4 of the power supply device 3 to the wire 2 to the position P which is electrically farthest from the wire 2. The wire 2R in the second section located on the right side is also provided with three current measuring devices 21. The electric fence 10 is not fixed, and the wire length is extended or shortened by changing the surrounding area R. In the second embodiment, the number of current measuring devices 21 is increased as compared with the first embodiment, but it is also possible to decrease the number. Then, if the length of the wire 2 is changed, the position of the position P that is electrically farthest from the connection point 4 of the power supply device 3 to the wire 2 also changes. The position P, the first section, and the second section in the electric fence 10 are for convenience for explaining the structure of the electric fence 10.

FIG. 6 shows the structure of the third embodiment of the electric fence monitoring device 20 of the present invention. In the third embodiment, the structure of the electric fence 10 is different from the structure of the electric fence 10 described with reference to FIG. 3 (a). In the third embodiment, the arrangement of the post 1 of the electric fence 10 is the same as that of the first embodiment, but the wire 2 is located on the left side of the position P which is the farthest electrically from the power supply device 3. It is divided into two sections, a wire 2L in the section and a wire 2R in the second section located on the right side. The + terminal 31 of the power supply device 3 is branched into two, connected to the wire 2L of the first section at the connection point 4L via the on / off switch 33L, and is connected to the wire 2R of the second section at the connection point 4R via the on / off switch 33R. It is connected to the. The wire 2L in the first section and the wire 2R in the second section are not connected at the position P which is electrically farthest from the power supply device 3.

The arrangement of the four current measuring devices 21 is the same as that of the first embodiment, and two are arranged on the wire 2L in the first section and two on the wire 2R in the second section. In the electric fence monitoring device 20 of the third embodiment, when one wire 2L or 2R of the electric fence 10 is separated from the power supply device 30 by the on / off switches 33L and 33R, it is installed on the wire that is not energized. The power of the alarm generator 22 and the transmitter 23 of the current measuring device 21 is turned off. The division of the wire 2 is not limited to two, and the wire 2 may be divided into three or more places around the region R. Further, in addition to the embodiment in which the wire 2 in one electric fence 10 is partially separated from the power supply device 30, when there is an adjacent electric fence 10, each electric fence 10 is independently separated from the power supply device 30. The structure is possible.

Here, an embodiment in which a voltage measuring device is incorporated in addition to the current measuring device 21 will be described in the electric fence monitoring device 20. As shown in FIG. 7A, the voltage measuring device may be provided inside each current detecting device 21 as a voltage measuring device 27, or as shown in FIG. 7B, a single voltage measuring device. As 27, it may be attached to the wire 2 of the electric fence 10.

When the voltage measuring device 27 is built in each current measuring device 21, the voltage sensor 27S is connected to each current measuring device 21 as shown in FIG. 7 (a), and the voltage measured value measured by the voltage sensor 27S. The VM is input to the current measuring device 21. The voltage measuring device 27 built in the current measuring device 21 is connected to the receiving device 23 and the transmitting device 24. Further, a threshold RV is set in the voltage measuring device 21, and when the voltage measured value VM falls below the threshold TV, the voltage measuring device 21 passes the voltage measured value through the transmitting device 24 regardless of the current measured value IM. The VM can be transmitted to the outside.

When the voltage measuring device 27 is related to the current detection operation of the current measuring device 21, the trigger signal TS received by the receiving device 23 is input to the voltage measuring device 27. Then, when the trigger signal TS is input from the receiving device 23, the voltage measuring device 27 may be able to transmit the voltage measured value VM to the outside through the transmitting device 24. By doing so, when the management device 25 receives the current measurement value IM from each current detection device 21, it can also receive the measurement voltage value VM of the wire at the position of each current detection device 21, so that the accuracy of the leakage determination can be improved. improves.

On the other hand, when the independent voltage measuring device 27 is attached to the wire 2, the receiving device 28 and the transmitting device 29 are built in the voltage measuring device 27 as shown in FIG. 7 (b). The receiving device 28 can receive the trigger signal TS transmitted from each current measuring device 21, and the transmitting device 29 can transmit the measured voltage measured value VM to the outside. The reason for providing the receiving device 28 is that the voltage measuring device 27 does not need to measure the voltage of the wire 2 when the electric fence 10 is in the normal state. The voltage measuring device 27 measures the voltage of the wire 2 because an electric leakage occurs in the electric fence 10 and a trigger signal TS is transmitted from one of the current measuring devices 21 and received by the receiving device 28 in the electric fence 10. Only in the case of an abnormal condition is sufficient.

FIG. 8 is a plan view showing the structure of the fourth embodiment of the electric fence monitoring device 20 of the present invention. In the fourth embodiment, the arrangement of the post 1 causes the wire 2 to be stretched around the region R in an arc shape. The power supply device 3 is connected to an extension wire 2E drawn from one post 1A for power supply connection at a connection point 4. In this embodiment, five current measuring devices 21A to 21E are provided, and the current measuring device 21A is provided in a portion between the connection point 4 of the extension wire 2E and the post 1A. Further, the current measuring devices 21B and 21C are provided on the wires 2 located on both sides of the post 1A, and the current measuring devices 21D and 21E are provided at positions where the arc-shaped wires 2 are substantially divided into three equal parts. However, the position of the current measuring devices 21D and 21E on the wire 2 is not limited.

In the electric fence monitoring device 20 of the fourth embodiment, the current value flowing through the entire electric fence 10 can be measured by the current measurement value detected by the current measuring device 21A. Further, from the current measurement values detected by the current measuring devices 21B and 21C, it can be seen whether the leakage flows more in the right direction or the left direction with respect to the post 1A. Further, the current measurement values detected by the current measuring devices 21D and 21E indicate which current measuring device 21 the portion of the wire 2 between the current measuring devices 21 causes the leakage.

In the fourth embodiment, for example, a case where an electric leakage occurs in the entire portion of the electric fence 10 is considered, but since the flowing current value differs depending on the structure of the electric fence 10, the magnitude of the current value is described as a level. .. In addition, each current measuring device 21 can also measure the direction of the flowing current. The current flowing in the current measuring device 21A is level 27, the current flowing in the current measuring device 21B in the direction of the arrow is level 17, the current flowing in the current measuring device 21C in the direction of the arrow is level 10, and the current flowing in the current measuring device 21D is in the direction of the arrow. The current flowing through the current measuring device 21E is defined as level 8, and the current flowing through the current measuring device 21E in the direction of the arrow is defined as level 4. In this case, it can be seen that there is a level 9 leakage current between the current measuring device 21B and the current measuring device 21D, and there is a level 6 leakage current between the current measuring device 21C and the current measuring device 21E. On the other hand, since the directions of the currents flowing through the current measuring device 21D and the current measuring device 21E are opposite to each other, there is a total level 12 leakage current between the current measuring device 21D and the current measuring device 21E, and the leakage in this section occurs. It turns out to be the most serious. In this way, by comparing the current detection values of the current measuring devices 21A to 21E, it is possible to identify the leakage point and the location where the leakage is large.

FIG. 9 is a plan view showing the structure of the fifth embodiment of the electric fence monitoring device 20 of the present invention. In the fifth embodiment, three regions R1, R2, and R3 to be protected by the electric fence 10 are adjacent to each other, and there are three loop-shaped electric fences 10 around each region R1, R2, R3. The wire 2 of the electric fence 10 in the adjacent portion of the regions R1, R2, and R3 is a shared wire 2D. Further, a voltage is applied from one power supply device 3 to all three loop-shaped electric fences 10 around the regions R1, R2, and R3. It should be noted that the illustration of the management device is omitted in this figure.

Two current measuring devices 21 are provided on the electric fence 10 surrounding the region R1, but since the region R2 and the region R3 have the shared wire 2D, one current measuring device is provided in the portion of the shared wire 2D. Only 21 is provided. Further, a voltage measuring device 27 is provided on the wire 2 at the portion farthest from the power supply device 3. As described above, when the areas to be protected by the electric fence 10 are adjacent to each other, the wire 2 in the adjacent portion and the current measuring device can be used in common. Reference numeral 9 in FIG. 9 indicates a door, and the door 9 can be opened when going back and forth between the areas R1 to R3.

FIG. 10A is a plan view showing the structure of the sixth embodiment of the electric fence monitoring device 20 of the present invention. The electric fence described so far has a loop shape, but the electric fence of the sixth embodiment has a line shape having a start end (the side to which the power supply device 3 is connected) and an end (free end). When the electric fence has a line shape, the current measuring device 21 can be provided on the wires 2 stretched on the post 1 arranged between the start end and the end at intervals close to equal intervals. In this embodiment, when there is a difference in the current measured values of the plurality of current measuring devices 21, the section between the current measuring devices 21 having the largest difference indicates the maximum leakage point.

FIG. 10B is a plan view showing the structure of the seventh embodiment of the electric fence monitoring device 20 of the present invention. The electric fence of the seventh embodiment also has a line shape having a start end and an end, but the difference from the electric fence of the sixth embodiment is that the wire 2 is branched at a branch point 2D in the middle and two ends. It is a point to prepare. The wire 2 includes a base wire 2B provided from the start end to the branch point 2D, and two branch wires 2E provided at the tip of the branch point 2D. In this embodiment, one current measuring device 21 is provided on the branch point 2D side near the connection point 4 of the power supply device 3 of the base wire 2B, and one is provided at each of the two branch wires 2E near the branch point 2D. It is provided one by one. In this structure, it is possible to identify which branch wire 2E the leakage has occurred by comparing the measured values of the current measuring device 21 provided on the branch wire 2E.

FIG. 10 (c) is a plan view showing the structure of the eighth embodiment of the electric fence monitoring device 20 of the present invention. The electric fence of the eighth embodiment is a point where the line-shaped wire 2 is branched at a branch point 2D in the middle and has two ends, as in the seventh embodiment. The same applies to the point that the wire 2 includes a base wire 2B provided from the start end to the branch point 2D and two branch wires 2E provided at the tip of the branch point 2D. The eighth embodiment differs from the seventh embodiment in that the current measuring device 21 is provided only on one of the two branch wires 2E near the branch point 2D. In this structure, when the current measuring device 21 provided on the base wire 2B detects the current and the current measuring device 21 provided on the branch wire 2E detects the current, it is determined whether or not an electric leakage has occurred in the branch wire 2E. Can be identified.

By the way, the current measuring device 21 needs some kind of power supply. Generally, when measuring the current with a tester or the like, a current of 30 to 40 mA is required at a voltage of 9 V. Assuming that the current measuring device 21 needs the same current as the tester, if the current measuring device 21 is constantly operated with six AA dry batteries, the batteries will be consumed in 3 to 4 days, and the current measurement will be performed. become unable.

Therefore, there are two conceivable methods for extending the battery life when the current measuring device 21 is operated by a battery. One is a method of reducing the standby power consumption of the current measuring device 21. In this method, an H-shaped coil is prepared and placed along the wire 2. A backflow prevention diode is provided at the tip of the coil, and operational amplifiers are provided at both ends of the coil. When an electric leakage occurs in the wire during standby, a large amount of current flows through the wire and an electromotive force is generated in the coil due to the induction. It is stored in a built-in capacitor, and the stored power is used to operate a current measurement circuit via an electric current to measure current. Further, it is also possible to count the number of times the electromotive force is generated, and when the count reaches a predetermined number, operate the current measurement circuit with the battery to measure the current. In this method, the current consumption of the battery can be suppressed to 150 μA or less. The other method is to operate the current sensor at regular intervals. With this method, it is not possible to monitor the leakage of the electric fence in real time, but it is possible to save power. Then, if the current measurement circuit outputs a trigger signal when a current exceeding the threshold value is detected a predetermined number of times or more, power saving can be achieved.

The measurement results of the current value of the wire include (a) when the current value exceeds the normal range, (b) when the current value can be measured from a place where no current value is generated, and (c) from a certain value. It may be 0. In the case of (a), the electric leakage becomes severe due to the contact with grass, etc., and in the cases of (b) and (c), the electric fence is consciously turned off, and the wire is broken due to an accident or the like. This is the case when the connection is cut off in the middle. In the cases of (b) and (c), when the power is consciously turned off, the current sensor recognizes this and waits unless this state changes, and the current measurement is not performed. On the contrary, when the energization of pulse electricity is started by the power supply device of the electric fence, the monitoring mode of the electric fence may be entered.

By the operations (a) to (c), the actual operating time and the transmission time of the current sensor can be reduced, and an efficient and power-saving system can be constructed. Further, since only the maximum value of the wave height of the current waveform is required at the time of current measurement, further power saving can be achieved by providing a peak hold circuit so as not to perform current measurement other than necessary.

Further, the reason why the voltage sensor is used together with the electric fence monitoring device is that the current sensor does not function in the electric fence monitoring device unless a voltage is applied to the electric fence. Therefore, if the current sensor attached near the end of the wire, which is the farthest from the power supply, also has a built-in voltage sensor, it is possible to check whether the required voltage is applied to the end and the electric fence is functioning. Become.

As described above, the electric fence monitoring device of the present invention can be used for the maintenance and management of a relatively large-scale electric fence, but at the same time, it can also be used for the management of small-scale electric fences dispersed in the area. The economic value is great.

1 Post 2 Wire 3 Power supply 6 Wire holder 7 Antenna 10 Electric fence 20 Monitoring device 21 Current measuring device 21S Current sensor 22 Trigger signal generator 23, 28 Receiving device 24, 29 Transmitting device 25 Management device 27 Voltage measuring device 30 Earth Rod 33, 33L, 33R On / off switch 34 Feed line 35 Earth line A Animal TS Trigger signal G Ground R Area (cultivated land)
W weeds

Claims (15)

A plurality of posts erected on the ground at predetermined intervals, a conductive wire stretched over the plurality of posts, and a high voltage applied to the wire by connecting to the wire at one place. An electric fence monitoring device provided on an electric fence that is equipped with a power supply device that gives an electric shock to an animal that touches the wire.
It comprises at least two current measuring devices for measuring the current flowing through the wire at a predetermined position, and a management device for receiving a signal transmitted from the current measuring device.
The current measuring device includes
A current sensor that measures the current flowing through the wire, and
A trigger signal generator that generates a trigger signal and inputs it to the transmitter when the current measurement value measured by the current sensor exceeds a preset threshold value.
When the trigger signal is input from the trigger signal generator, a transmission device that transmits the trigger signal and the current measurement value to the outside, and a transmission device.
The trigger signal transmitted from another current measuring device is directly received, or the command signal from the management device that has received the trigger signal is received, and the received signal is input to the transmitting device of the own current measuring device to self. A receiving device that transmits the current measured value measured by the current sensor of the current measuring device to the outside is provided.
The management device is provided with a display, and when a current measurement value transmitted from each current measurement device is received, a plurality of received current measurement values are displayed on the display so that the leakage point in the electric fence can be visually recognized. An electric fence monitoring device characterized by this. The management device compares a plurality of received current measurement values, identifies the current measurement device having the largest value of the compared multiple current measurement values as the closest to the leakage point, and displays it on the display. The electric fence monitoring device according to claim 1. The management device compares a plurality of received current measurement values, calculates the current flowing through the wire between the adjacent current measurement devices, and determines that the leakage point is located in the portion of the wire having the largest current flow value. The electric fence monitoring device according to claim 1, wherein the electric fence is specified. The current measuring device measures the current flowing through the wire at predetermined time intervals, and when the current measurement value exceeds the threshold value, continues to measure the current flowing through the wire within the reference time, and measures the current even after the reference time has elapsed. The monitoring device for an electric fence according to any one of claims 1 to 3, wherein the trigger signal generator generates a trigger signal when the value exceeds the threshold value. A voltage measuring device is attached to the current measuring device.
The voltage measuring device is connected to the receiving device and the transmitting device, and is configured to be able to transmit a voltage measured value.
The voltage measuring device transfers the voltage measured value to the management device by the device device when the receiving device receives the trigger signal, every predetermined time, and when the voltage measured value falls below another threshold value. The electric fence monitoring device according to any one of claims 1 to 4, wherein the electric fence is configured to transmit. The current measuring device is given a unique number and is given a unique number.
At the time of transmission, the transmitting device transmits the unique number to the management device.
The management device according to any one of claims 1 to 5, wherein the management device identifies the received current measurement value and the current measurement device that has transmitted the voltage measurement value by the received unique number. Electric fence monitoring device. The electric fence according to any one of claims 1 to 6, wherein the electric fence has a structure including a start end to which the power supply device is connected and an end to which nothing is connected to the wire. Monitoring device. The wire of the electric fence is a base wire located between the start end and the branch point of the wire, and a plurality of branch wires having one end connected to the branch point and the other end connected to nothing. The electric fence monitoring device according to any one of claims 1 to 6, wherein the structure is formed from an electric fence. The electric fence is an electric fence provided in a loop shape along the boundary of an area isolated from the outside, and the power supply device is characterized in that it has a structure connected to one place of the loop-shaped wire. The electric fence monitoring device according to any one of claims 1 to 6. The loop-shaped wire is divided into a wire in a first section located on the left side from a connection point of the power supply device to the wire to a position electrically farthest from the wire, and a wire in a second section located on the right side. The electric fence monitoring device according to claim 9, wherein the current measuring device is provided at least one for each of the wire in the first section and the wire in the second section. The power supply device is connected to the wire of the first section and the wire of the second section so as to be able to independently supply power to the wire of the first section and the wire of the second section.
When a high voltage is applied from the power supply device to only one of the wire in the first section and the wire in the second section, the wire in the section to which the high voltage is not applied is provided. The electric fence monitoring device according to claim 9, wherein the current measuring device has stopped functioning. The electric fence according to claim 9, wherein N is an integer of 2 or more, and there are N regions to be isolated and they are adjacent to each other, and a common wire is stretched at the boundary portion of each region. Monitoring device. The electric fence monitoring device according to any one of claims 1 to 12, wherein the threshold value preset in the current measuring device can be changed. The electric fence monitoring device according to any one of claims 1 to 13, wherein one of the current measuring devices is provided in the power supply device. The electric fence monitoring device according to any one of claims 1 to 14, wherein the current measuring device measures a current flowing through the wire at predetermined time intervals.

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