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WO2004095893A1 - Appareil et procede de surveillance de l'etat d'une cloture - Google Patents

Appareil et procede de surveillance de l'etat d'une cloture Download PDF

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Publication number
WO2004095893A1
WO2004095893A1 PCT/NZ2004/000076 NZ2004000076W WO2004095893A1 WO 2004095893 A1 WO2004095893 A1 WO 2004095893A1 NZ 2004000076 W NZ2004000076 W NZ 2004000076W WO 2004095893 A1 WO2004095893 A1 WO 2004095893A1
Authority
WO
WIPO (PCT)
Prior art keywords
fence line
monitoring apparatus
signal
fence
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/NZ2004/000076
Other languages
English (en)
Inventor
Richard Lloyd Johnston
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gallagher Group Ltd
Original Assignee
Gallagher Group Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gallagher Group Ltd filed Critical Gallagher Group Ltd
Priority to GB0523737A priority Critical patent/GB2416105B/en
Priority to AU2004231810A priority patent/AU2004231810B2/en
Publication of WO2004095893A1 publication Critical patent/WO2004095893A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05C—ELECTRIC CIRCUITS OR APPARATUS SPECIALLY DESIGNED FOR USE IN EQUIPMENT FOR KILLING, STUNNING, OR GUIDING LIVING BEINGS
    • H05C3/00—Other circuits or apparatus
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05C—ELECTRIC CIRCUITS OR APPARATUS SPECIALLY DESIGNED FOR USE IN EQUIPMENT FOR KILLING, STUNNING, OR GUIDING LIVING BEINGS
    • H05C1/00—Circuits or apparatus for generating electric shock effects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections

Definitions

  • This invention relates to an improved method and apparatus for detecting faults or changes in the condition of an electrified fence.
  • the present invention may be adapted to monitor the condition of the fence both during periods of energisation of the fence and periods in which the fence is not energised.
  • the present invention may also be adapted to monitor the condition of an electrified security fencing in preferred embodiments.
  • Electrified security fences are often deactivated during daylight hours when the area the fence protects is normally accessible to authorised personnel and in some instances the general public, who could inadvertently come in contact with electrified wires of the fence.
  • the fence is not electrified, there is the potential for materials to be stacked against and in contact with the fence or for vehicles to be parked in contact or in close proximity to the electrified wires.
  • the potential for an unauthorised person to cut, damage or otherwise tamper with the fence line without being exposed to a high voltage pulse from the lines they are tampering with.
  • One current method of monitoring the state of an electric fence is through monitoring the type, form or parameters associated with the particular electric fence pulses or alternating current waveforms driven through the electrified wires. Changes in the parameters of these signals or transmissions will indicate a change in the impedance of the fence wire, as a consequence of a change in the condition of the fence wire.
  • monitoring the voltages on the high voltage electrification line or deterrent wire does not necessarily allow the condition of the fence line to be monitored when the fence is not energised.
  • these types of monitoring approaches are susceptible to false alarms caused by gradual changes in the condition of the fence. These gradual changes can be caused by vegetation growth slowly coming into contact with the deterrent wire or through gradual changes in the physical condition of the fence, all of which can change the impedance of the deterrent wire or line and subsequently trigger false alarms.
  • An alternative approach to the above is to provide an additional wire in the fence through which a low voltage direct current signal is transmitted. Tampering with the fence may result in this 'tamper evident' wire or line being cut with the subsequent interruption of the DC signal driven down the line being indicative of tampering occurring with the fence.
  • a separate low voltage tamper line may not necessarily be cut or damaged at the same time at which a high voltage deterrent or live wire is cut or tampered with.
  • the use of a relatively low voltage DC electrical signal can cause electrolysis effects and result in degradation of the quality of connections to the DC line. This degradation will subsequently change the impedance of the line involved and hence again potentially trigger a false alarm being detected.
  • a monitoring apparatus adapted to monitor the condition of a fence line, said apparatus including
  • an interface adaptor having a connection to a fence line to be monitored, said interface adaptor having a connection to the reference signal generator which provides isolation of the reference signal generator from the fence line, wherein ' said interface adaptor is configured to place a reference signal generated by the reference signal generator on the fence line at a point remote from the location of an electric load present on said fence line, and
  • a detection system adapted to receive a translated signal from the interface adapter, said detection system having a connection to the interface adapter which provides isolation of the detection system from the fence line,
  • the detection system is adapted to indicate the condition of the fence line monitored through the state of at least one parameter associated with the translated signal.
  • the present invention is adapted to provide a monitoring apparatus and method which can be used to monitor the condition and state of an electric fence line.
  • the electric fence line monitored is adapted to carry high voltage pulses or high voltage alternating currents to serve as a deterrent against an unauthorised person wishing to breach the fence.
  • the present invention may be used to monitor the condition of such electrified lines and also indicate whether such lines have developed a fault, or have been tampered with in such a way that they can no longer effectively carry the electrical transmissions required.
  • the present invention includes a reference signal generator.
  • This component is adapted to generate a reference signal to in turn be placed on the fence line to be monitored.
  • an electrical reference signal may be generated with known characteristics where the condition and physical properties of the fence line will in turn alter or modify these characteristics to result in a translated signal. Placing the reference signal on the fence line will immediately result in the production of the translated signal propagating along the fence line due to the physical characteristics and condition of the fence line. The degree of alteration or modification of the reference signal as measured in or presented by the translated signal produced will then provide an indication as to the condition or state of the fence line monitored.
  • references to a translated signal as discussed above do not relate to a simple D.C. offset applied to a reference signal.
  • a relatively low voltage reference signal may be produced by the reference signal generator.
  • the reference signal applied may have a voltage which is below the threshold of sensation for the average person.
  • the voltage of the reference signal may preferably be within or below a safe voltage value as defined in existing published electric fence standards.
  • the voltage of the reference signal applied maybe between 1 -200 volts, and preferably between 1 -42 volts.
  • a relatively low voltage reference signal ensures that the transmission of the reference signal to the fence line will not cause safety concerns or issues for persons in the vicinity of the fence line who potentially may come into contact with same.
  • the present invention may be adapted to monitor the condition of a fence line without necessarily having the same fence line energised by high voltage electrical pulses. The use of a low voltage reference signal will then allow the fence line to be monitored without causing safety concerns to those in the vicinity of the line.
  • the reference signal may be formed from an alternating current or sinusoidal waveform type signal.
  • AC waveforms have distinct and easily measured electrical properties or parameters and can also be easily generated using existing signal generation components.
  • a relatively low power AC reference signal may be employed to achieve the aims of the present invention while minimising the energy consumption costs associated with operating the monitoring apparatus.
  • a reference signal may be generated using known electrical signal generation circuitry and components well known in the art.
  • a reference signal generator may be implemented through the use of a microprocessor adapted to produce a square wave signal which can subsequently be shaped or formed into a standard sine wave alternating current signal by various signal filtering components or systems.
  • a microprocessor adapted to produce a square wave signal which can subsequently be shaped or formed into a standard sine wave alternating current signal by various signal filtering components or systems.
  • signals and other types of signal generation systems may also be employed and reference to the above only throughout this specification should in no way be seen as limiting.
  • the present invention may also include an interface adapter which is adapted to interface the other remaining components of the monitoring apparatus with the fence line to be monitored.
  • the adapter may provide isolated connections to other components of the apparatus where these connections provide such components with electrical isolation from the electric fence line monitored.
  • the interface adapter may be adapted to place the reference signal on the fence line at a position remote from the location of an electrical load on the same fence line.
  • the monitoring apparatus may be located at the return or terminating end of the fence line monitored. This location on the fence line may be defined as the opposite end of the line to an energiser used to transmit high voltage pulses along the line, or alternatively the opposite end to any other type of electrical load placed on the same line as the monitoring apparatus.
  • the impedance of the electrical load remote from the monitoring apparatus may be substantially greater than the impedance of the fence line to be monitored.
  • An electrical load located remote from the return end of the fence line monitored may be formed from a capacitive, inductive or resistive load if required depending on the specific implementation with which the present invention is employed.
  • the remote electrical load involved may form an inductive load to an alternating current signal. This selection can be made so that the resistive impedance of the fence line (formed by the length of fence, bad joints etc.), has less effect on the overall impedance of the monitored system, while the inductive component is the dominant component of the impedance.
  • changes in the resistive impedance of the system may be discriminated from the end of line inductance. This provides improvements to immunity against variances in fence installations over existing resistive sensing systems.
  • any other type of electrical load may also be employed in conjunction with the present invention and reference to the load being provided through an electrical fence energiser only should in no way be seen as limiting.
  • the interface adapter placing a reference signal at a terminating end of a fence line where the electric fence energiser involved is located at the opposite end of such a fence line.
  • This configuration of the invention allows the entire length of the fence line to be monitored, but again those skilled in the art should appreciate that location of components of the present invention at one, or the extreme opposite ends only of a fence line should in no way be seen as essential.
  • the interface adapter may be formed from or include an electrical transformer.
  • a transformer can be used to block the relatively high voltage electrical pulses normally transmitted along the electric fence line during standard operation to prevent damage to other components employed in conjunction with the present invention.
  • the isolated windings of such a transformer may be used to allow a reference signal to be applied to, for example, the primary winding and be induced onto the fence line through the secondary windings of the transformer.
  • a translated signal present on the fence line (due to the induction of the reference signal onto same) may be induced across the secondary windings of the transformer onto the primary windings to subsequently be detected or received by a detection system.
  • the interface adaptor may also include protection or limiting components if required.
  • protection components may be used to protect further elements of the monitoring apparatus provided from high energy pulses or signals present on the fence line monitored. Such protection components may damp out or dissipate the energy present in such pulses or signals prior to further components of the monitoring apparatus being exposed to same.
  • a transformer used as or in an interface adaptor may also be insulated to a specific standard or degree to cope with a high voltage pulses transmitted along the fence line and thereby allowing the transformer to subsequently protect the remaining components of the monitoring apparatus employed from damage.
  • a transformer employed in conjunction with the present invention may be provided through a high voltage insulated electrical transformer. Such a transformer is normally specifically adapted to be used with electric fences carrying high voltage pulses typically in the order of 6-10 kV, and can provide approximately 20 kV of isolation between a primary and secondary windings.
  • interface adapter which again provide the same degree of isolation may also be used in conjunction with the present invention.
  • optical isolation systems and adapters may be used to present a reference signal to the fence line and subsequently retrieve a translated signal from the same fence line if required.
  • electrical transformers only throughout the specification should in no way be seen as essential in the implementation of the present invention.
  • the present invention may include a detection system adapted to receive a translated signal and a subsequently indicate the condition of the fence line monitored.
  • a detection system may preferably provide an indication of the fence line's condition through an alarm buzzer, warning light or any other type of alert signal which is triggered through the detection of a fault in the fence line or through the detection of tampering having occurred to the fence line.
  • the alarm signal of a detection system may be used to control or operate further independent equipment or devices.
  • the detection system may be provided with a connection to the primary winding of an interfacing transformer where the secondary winding of the transformer is connected to the fence line.
  • the connection to the primary winding may then allow an induced translated signal to be read or received from the primary winding where this translated signal is used as an input to the detection system.
  • the detection system is adapted to investigate or consider the state of at least one parameter associated with a received translated signal.
  • an amplitude, level, power or energy value associated with a particular parameter may be investigated to determine the state of the fence line monitored.
  • Those skilled in the art should appreciate that many different and varied parameters such as voltage, current, signal frequency or phase angle may all be employed if required in various embodiments to indicate the state of the fence line.
  • the voltage of the translated signal may be considered to determine whether a fault or tampering event has occurred with respect to the fence line monitored.
  • the voltage of the translated signal may be compared with at least one threshold voltage value, and an alarm condition may be indicated if the measured translated signal or voltage is less than or greater than a specific threshold value.
  • the detection system may be implemented through or at least include one or more comparator circuits.
  • a comparator may be provided with a reference threshold voltage and the voltage of the translated signal as inputs where the output of the comparator (being either voltage high or ground) will indicate whether a fault or tampering condition has occurred.
  • the detection system may also include peak detection circuitry in the case where the original reference signal employed is formed from alternating current waveforms.
  • peak detection circuitry may convert the received alternating current translated signal into a direct current signal with a specific voltage value or parameter. This D.C. signal may then be easily managed or manipulated using standard analogue or digital circuitry.
  • the voltage measured for the translated signal may be compared against two separate and distinct threshold voltage values.
  • the condition of the fence line monitored will be acceptable when the voltage measured resides between an upper and a lower voltage threshold for the received translated signal.
  • Preferably two distinct threshold voltage comparisons are made to monitor situations where the impedance of the fence line monitored has increased or reduced. Either of these two conditions can indicate the presence of a fault in the line or that tampering of the line has occurred.
  • one or more variable threshold parameters may be used in the comparisons made to monitor the state of the fence line involved.
  • the actual threshold parameter to which a comparison is made may be adjusted or modified to take into account gradual changes in the state of the fence line. These changes could be caused by, for example, vegetative growth, gradual oxidation of metallic components of the fence or any other factors which will slowly and gradually change the condition of the fence line.
  • one or more rolling average threshold voltage values may be maintained to track gradual changes in the condition of the fence which do not necessarily indicate tampering or a fault condition.
  • a rolling average of the translated signal may be maintained with the threshold value set at plus or minus 20% of a current rolling average or voltage value.
  • gradual changes in the condition of the fence line may be compensated for by using mechanisms other than the rolling average technique discussed above.
  • the rate of change of voltage, current or other similar electrical parameters associated with the translated signal may be measured and used as a threshold value. A significant rate of change in one of the characteristics of the translated signal will therefore indicate fault or alarm condition, as opposed to changes made through more gradual factors.
  • An upper bound frequency of this signal may be selected depending on the load of the fence line monitored under normal operating conditions. For example, in some instances the normal load of the fence line may be estimated and an additional margin of error of, for example, 20% can be added to this load value to determine a threshold voltage for when the load of the fence increases by approximately 20% or more.
  • a lower threshold voltage value may be selected depending on the impedance of a remote electrical load (preferably being an energiser) on the fence line to be monitored.
  • the frequency of this reference signal may be selected depending on the characteristics and configuration of the fence line to be monitored.
  • An upper bound frequency of this signal will be determined by the potential resonant frequency of the fence line or lines with which the present invention is to be employed. In the vicinity of the resonant frequency the impedance of the line is at its largest. Furthermore, there is the potential for this resonant frequency to shift randomly due to small physical movements in the position of the line caused by wind for example, or through the proximity of metallic objects (such as vehicles) which have a capacitative effect.
  • a lower bound frequency for an alternating current reference signal may be selected to control the remote electrical load (or preferably the energiser output circuitry) impedance placed on the opposite end of the line from the interfacing transformer employed.
  • the reference signal frequency may be selected to ensure that this termination impedance is of a reasonable and easily measured magnitude. Such a manageable terminating impedance will clearly indicate whether a short or open circuit has occurred between the interfacing transformer and the energiser.
  • a reference signal frequency of between 100 Hz to 5 kHz may be employed.
  • the selection of this particular frequency range will allow as high as possible reference signal frequency to be employed without necessarily coming close the resonant frequency of the fence line to be monitored.
  • a reference signal frequency of between 1 kHz - 2 kHz is also preferable in some instances where some common forms or constructions of electric fence energiser output circuits are applied at the terminating end of the fence line monitored.
  • the present invention may provide many potential advantages over the prior art.
  • a monitoring apparatus and method of using same may allow the condition of an electric fence line to be monitored without the need for the fence line to be energised by the high voltage electrical pulses or signals. This allows the condition of the fence line to be monitored even when the fence is turned off during hours when authorised personnel are usually in the vicinity of the fence.
  • the present invention may allow the condition of an electric fence line to be monitored concurrent with the transmission of high voltage pulses or signals down the same electric fence line.
  • the present invention may provide such a monitoring facility both concurrent with the operation of electric fence energiser and also when such an energiser is not used or turned off.
  • a low voltage alternating current reference signal in preferred embodiments also allows authorised personnel to work in the vicinity of and potentially come into contact with the fence line, without health and safety issues.
  • the combination of preferably a high voltage insulated transformer used as an interface adapter and the provision of a low voltage alternating current reference signal protects the electrical components employed by the monitoring apparatus and also limits the voltage of the signals induced or placed onto the fence line.
  • the reference signal may provide minimal power consumption demands for the reference signal generator employed thereby providing a relatively efficient and low power consumption monitoring apparatus.
  • Figure 1 illustrates a block schematic diagram of a monitoring apparatus when interfaced with a fence line in accordance with a preferred embodiment of the present invention
  • FIG. 2 shows a block schematic diagram of components employed in the construction of a monitoring apparatus as configured in accordance with a further embodiment of the present invention.
  • Figure 3a shows a block schematic diagram of components employed in construction of the detection system discussed with respect to figure 1 ;
  • Figure 3b shows a block schematic diagram of components employed in the fence isolation and protection system employed in the apparatus discussed with respect to figure 1 ;
  • Figure 4a & 4b show voltage versus time waveform plots for a translated signal in figure 3a as received by the detection system discussed in figure 2, and a rectified translated signal 3b.
  • FIG. 1 shows a block schematic diagram of a monitoring apparatus when interfaced with a fence line in accordance with a preferred embodiment of the present invention.
  • the components of the monitoring apparatus are shown within the dotted outline illustrated.
  • the monitoring apparatus consist of and incorporates a reference signal generator, showing this embodiment as a low voltage AC wave generator (1).
  • the monitoring apparatus also includes an interface adapter, which is provided in this embodiment by a high voltage isolation transformer (2) which preferably includes protection components.
  • the last major component employed in the monitoring apparatus is a detection system, shown in this embodiment as a detection circuit (3).
  • the wave generator (1 ) and detection circuit (3) are provided with direct electrical connections to the primary windings of the isolation transformer (2). Conversely the secondary windings of the transformer (2) are connected to live (4) and ground (5) for an electric fence line. An electric fence energiser (6) is located at the opposite end of the line.
  • the isolation transformer (2) isolates the wave form generator (1) and detection circuit (3) from these pulses and thereby from damage by these high voltage pulses.
  • the wave form generator (1) Through its connection to the primary windings of the transformer (2) the wave form generator (1) generates a reference signal which is induced over the transformer onto the fence line.
  • a 24 volt alternating current wave form is applied as the reference where this signal has a frequency of approximately 1-2 kHz.
  • the induced reference signal is then modified by the characteristics or condition of the fence line and the electric fence energiser to subsequently produce a translated signal present on the fence line.
  • Figure 2 shows a block schematic diagram of components employed in the construction of a monitoring apparatus as configured in accordance with a further embodiment of the present invention.
  • a monitoring apparatus (11) is again provided.
  • the apparatus is connected to a fence system (4, 5) through a fence isolation and protection unit (2), again implemented through a high voltage isolation transformer.
  • the majority of the signal processing and signal generation functions of the monitoring apparatus (11) are implemented through use of a microprocessor (17).
  • the microprocessor (17) is used to generate an alternating current square wave signal which is subsequently supplied to a further sine wave filter wave monitor (18) for smoothing or modification into a sine wave signal.
  • the filtered sign wave (destined to form the reference signal required) is then subsequently supplied to a gain control amplifier (19) which fine tunes the voltage amplitude of the signal to provide a consistent, reproducible reference signal.
  • the microprocessor again controls the operation of the gain controlling amplifier (19) through the additional feedback loop shown.
  • the microprocessor (17) also receives a signal from signal measurement circuitry (13) for subsequent consideration and detection of any abnormal fence conditions. If problems with the state of the fence are detected by the microprocessor (17) a series of light emitting diode indicators (20) may be lit by the microprocessor. In addition, control signals to other independent electrical equipment or components can be transmitted by the microprocessor through relay output connections (21).
  • Figure 3a shows a block schematic diagram of components employed in construction of the detection circuit discussed with respect to figure 1.
  • the detection circuit (3) includes an input stage which feeds into an operational amplifier (7).
  • the amplifier boosts the voltage of the translated signal received to a level which can be easily managed and manipulated by the remaining components of the detection circuit (3).
  • the amplified signal is supplied to a peak detection system (8) which produces a DC electrical signal from the AC translated signal. This peak signal has a voltage proportional to the amplitude peaks of the source AC translated signal.
  • This peak signal is lastly supplied as an input to a pair of comparators (9 & 10).
  • the first comparator (9) tests the input voltage against an upper threshold voltage value. If the input voltage is higher than the upper threshold voltage, the output line of the comparator sends an alarm signal to a warning buzzer (not shown). Conversely with the second comparator, the peak translated signal voltage is compared against a lower threshold voltage value and an alarm condition is indicated if the input voltage is below this lower threshold voltage.
  • Figure 3b shows a block schematic diagram of components employed in the fence isolation protection system discussed with respect to the monitoring apparatus of figure 1.
  • the isolation and protection system includes an insulated transformer (11) with one winding connected to the fence line to be monitored (not shown). The remaining winding of the transformer (11) is connected to a pair of damping resistances (12) and a current blocking diode (13). A pair of output terminals (14) are provided to link the isolation and protection system to other components of the monitoring apparatus which require protection from high voltage pulses transmitted along the fence line monitored.
  • the combination of the resistances (12) and current blocking diode (13) serve to damp out and dissipate the energy of pulses transferred across the transformer (11) and also provide a current blocking rectification facility through the diode (13).
  • Figure 4a & 4b show voltage versus time waveform plots for a translated signal, in figure 4a and a peak signal in figure 4b.
  • the peak detection circuit employed in the detection circuit modifies the alternating current waveform of the original translated signal (shown in figure 4a) to a straight, flat DC voltage signal as shown with respect to figure 4b.
  • Figure 4b also shows the upper and lower threshold voltage values which indicate whether an alarm condition has been detected using the supplied translated signal.
  • a DC value in the middle or between these two voltage thresholds will indicate a normal or acceptable condition for the fence line monitored whereas a voltage outside of this accepted band will trigger the indication of an alarm condition.

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  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Insects & Arthropods (AREA)
  • Environmental Sciences (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Animal Husbandry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Selective Calling Equipment (AREA)

Abstract

L'invention concerne un appareil de surveillance conçu pour surveiller l'état d'une ligne de clôture (4) et comprenant un générateur de signal de référence (1) et un adaptateur d'interface (2) configuré de manière à placer un signal de référence sur une ligne de clôture. Cet adaptateur d'interface présente une connexion au générateur de signal de référence assurant l'isolation dudit générateur par rapport à la ligne de clôture, l'adaptateur d'interface plaçant un signal de référence sur la ligne de clôture à distance de l'emplacement d'une charge électrique (6) présente sur la ligne de clôture. L'appareil de surveillance comporte également un système de détection (3) permettant de recevoir un signal translaté provenant d'adaptateur d'interface, ce système de détection ayant une connexion à l'adaptateur d'interface assurant l'isolation du système de détection de la ligne de clôture. Le système indique l'état de la ligne de clôture sous surveillance au moyen de l'état d'un paramètre associé à un signal translaté reçu par le système de détection.
PCT/NZ2004/000076 2003-04-22 2004-04-20 Appareil et procede de surveillance de l'etat d'une cloture Ceased WO2004095893A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB0523737A GB2416105B (en) 2003-04-22 2004-04-20 Fence condition monitoring apparatus and method
AU2004231810A AU2004231810B2 (en) 2003-04-22 2004-04-20 Fence condition monitoring apparatus and method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ525455 2003-04-22
NZ525455A NZ525455A (en) 2003-04-22 2003-04-22 Fence condition monitoring apparatus and method

Publications (1)

Publication Number Publication Date
WO2004095893A1 true WO2004095893A1 (fr) 2004-11-04

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PCT/NZ2004/000076 Ceased WO2004095893A1 (fr) 2003-04-22 2004-04-20 Appareil et procede de surveillance de l'etat d'une cloture

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AU (1) AU2004231810B2 (fr)
GB (1) GB2416105B (fr)
NZ (1) NZ525455A (fr)
WO (1) WO2004095893A1 (fr)
ZA (1) ZA200509220B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007012090A1 (fr) * 2005-07-22 2007-01-25 Sean Hurly Regulateur d'energie de sortie pour electrificateur de cloture
WO2009006646A1 (fr) * 2007-07-02 2009-01-08 Nedsis Bv Système de surveillance de clôture électrique
WO2010062200A1 (fr) * 2008-11-26 2010-06-03 Gallagher Group Limited Améliorations apportées à des dispositifs d'excitation
US9642230B2 (en) 2013-03-15 2017-05-02 Electric Guard Dog, Llc Systems and methods of providing enhanced electric fence diagnostics
WO2021162825A1 (fr) * 2020-02-14 2021-08-19 TransGard LLC Générateur d'impulsions électriques réglable pour un élément électrifié

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US4297633A (en) * 1975-12-23 1981-10-27 The University Of Melbourne Electric fence monitoring system with energizer, responder and receiver
US5651025A (en) * 1991-05-17 1997-07-22 Gallagher Electronics Limited Method and apparatus pertaining to communication along an electric fence line

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ZA925549B (en) * 1991-04-23 1994-01-24 Christopher Graham Jenkinson A method and apparatus for monitoring a transmission line
FR2813977A1 (fr) * 2000-09-12 2002-03-15 Lacme Systeme de controle pour cloture electrique

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US4297633A (en) * 1975-12-23 1981-10-27 The University Of Melbourne Electric fence monitoring system with energizer, responder and receiver
US5651025A (en) * 1991-05-17 1997-07-22 Gallagher Electronics Limited Method and apparatus pertaining to communication along an electric fence line

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DATABASE WPI Derwent World Patents Index; Class S01, AN 1994-176649, XP002904872 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007012090A1 (fr) * 2005-07-22 2007-01-25 Sean Hurly Regulateur d'energie de sortie pour electrificateur de cloture
WO2009006646A1 (fr) * 2007-07-02 2009-01-08 Nedsis Bv Système de surveillance de clôture électrique
WO2010062200A1 (fr) * 2008-11-26 2010-06-03 Gallagher Group Limited Améliorations apportées à des dispositifs d'excitation
US9642230B2 (en) 2013-03-15 2017-05-02 Electric Guard Dog, Llc Systems and methods of providing enhanced electric fence diagnostics
US9839104B2 (en) 2013-03-15 2017-12-05 Electric Guard Dog, Llc Systems and methods of providing enhanced electric fence diagonstics
WO2021162825A1 (fr) * 2020-02-14 2021-08-19 TransGard LLC Générateur d'impulsions électriques réglable pour un élément électrifié

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ZA200509220B (en) 2006-08-30
AU2004231810A1 (en) 2004-11-04
GB2416105B (en) 2006-05-24
NZ525455A (en) 2006-01-27
AU2004231810B2 (en) 2008-11-20
GB2416105A (en) 2006-01-18

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