WO2004017077A1 - Apparatus for detecting tampering with a utility meter - Google Patents
Apparatus for detecting tampering with a utility meter Download PDFInfo
- Publication number
- WO2004017077A1 WO2004017077A1 PCT/GB2003/003371 GB0303371W WO2004017077A1 WO 2004017077 A1 WO2004017077 A1 WO 2004017077A1 GB 0303371 W GB0303371 W GB 0303371W WO 2004017077 A1 WO2004017077 A1 WO 2004017077A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- magnetic field
- detection
- utility meter
- meter
- electronic utility
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/061—Details of electronic electricity meters
- G01R22/066—Arrangements for avoiding or indicating fraudulent use
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
- G01R11/24—Arrangements for avoiding or indicating fraudulent use
Definitions
- the present invention relates to utility meters and more particularly to apparatus for detecting tampering with such meters.
- Meters for measuring consumption of gas and electricity are well known and many rely on electromagnetic or electronic principles. Such meters can be tampered with by applying magnets to the meter in order to reduce or actually stop the registration of consumption. This has resulted in proposals to provide the meters or at least the active part of such meters with magnetic shields. However, in response to this, persons wishing to tamper with meters have resorted to using stronger and stronger magnets.
- an abnormally high magnetic field is detected, this fact is preferably recorded by the meter in some convenient fashion, e.g. by noting the date and time of the occurrence.
- the removal of the abnormally high magnetic field can also be detected and recorded.
- the apparatus utilises a ferrite core provided with a coil which is used to provide a sense signal which can be evaluated.
- Fig 1. shows a block diagram of a utility meter provided with apparatus according to the present invention.
- Fig 2. shows a diagrammatic representation of apparatus according to the present invention.
- the preferred embodiment of the present invention is an electricity meter which may be either a conventional electromagnetic meter or a more modern electronic meter which utilises a current transformer in order to detect consumption of electricity. It will be appreciated that this is simply an example of a utility which could be metered and that the present invention is capable of being utilised with different types of meter for recording the consumption of different flowing substances.
- Fig 1. shows a block diagram of an electricity meter where it is assumed it is an electronic meter.
- Electronic meters differ from traditional electromechanical meters in that electronic meters do not use a meter system with a disc which rotates and which is driven at a rate dependent upon the current drawn. Instead, electronic meters measure electricity consumption by detecting current utilising a current detector 10 in the form of a current transformer whose output is fed to a computation section which is preferably constituted by a microprocessor 11. The result of the computation is then recorded and periodically stored in a memory 12.
- the electronic meter may be provided with communication means well known in the art to allow for the meter to be read remotely through a communication link. Thus far the meter is standard.
- the current detection can be affected by the presence of a high external magnetic field.
- the present invention is designed to detect the presence of such a field and to cause the presence of such a field to be recorded by the meter and preferably also to be indicated to the user in the hope of deterring tampering with the meter.
- the indication can be any suitable visible and/or audible indication such as flashing a display or flashing a red light. It is preferred to record the commencement and cessation of the existence of the abnormally high magnetic field so that the utility provider can take appropriate steps.
- the presently preferred arrangement for detecting the magnetic field is represented in Fig 1. by the magnetic field detector 20 whose output is fed to a computation circuit 21.
- the circuit 21 includes a comparator for comparing the output from the magnetic field detector with a threshold level which is chosen to indicate the presence of the abnormally high magnetic field.
- the circuit 21 outputs a signal to the memory 12 and records the date and time of the commencement and cessation of the existence of the abnormally high magnetic field. Additionally, if desired, the circuit 21 also triggers an indicator 22. If one now refers to Fig 2., this shows the preferred arrangement for detecting magnetic fields. It consists of an inductance L constituted by a ferrite core provided with a coil.
- One end of the coil is earthed via a resistor and this end constitutes the output from the detector.
- the other end of the coil constitutes the input to the detector and is fed with a waveform from a signal generator 23 which is shown in Figl..
- the signal generator outputs a square wave which will normally result in the output of the coil being a somewhat saw toothed waveform due to the inductance L.
- the slopes of the saw tooth are determined by the inductance value of the coil L and the ferrite core and coil are arranged to saturate at a predetermined level of external magnetic field.
- the ambient magnetic field can be registered and this will provide a datum level to which an offset indicative of the abnormally high magnetic field will be added.
- the above detector could be utilised with a magnetic shield for the meter. If the magnetic field detector were located outside the shield, then this would result in someone wishing to tamper with the meter would have to utilise a sufficiently high magnetic field which would inevitably be detected by detector circuit.
- the detector coil provided with the ferrite core will be able to detect both alternating and direct magnetic fields and that because ferrite materials are easy to form, the ferrite core can be made to detect omni-directional magnetic fields.
- various modifications to the circuitry are envisaged and various components of the meter may be shared with the magnetic field detector.
- the microprocessor may be utilised to evaluate the output of the detector. This may require a separate A/D channel being available.
- it is possible to modify the current transformer or power supply transformer for an electronic meter by adding an extra winding which will be supplied with the detection waveform. This, however, may require some additional computation for the actual meter reading so as to avoid false readings due to the presence of the detection waveform.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03787861A EP1532457A1 (en) | 2002-08-15 | 2003-08-04 | Apparatus for detecting tampering with a utility meter |
NZ538200A NZ538200A (en) | 2002-08-15 | 2003-08-04 | Apparatus for detecting tampering with a utility meter |
AU2003252966A AU2003252966B2 (en) | 2002-08-15 | 2003-08-04 | Apparatus for detecting tampering with a utility meter |
IL166819A IL166819A (en) | 2002-08-15 | 2005-02-10 | Apparatus for detecting tampering with a utility meter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0219035.3 | 2002-08-15 | ||
GB0219035A GB2391948B (en) | 2002-08-15 | 2002-08-15 | Apparatus for detecting tampering with a utility meter |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004017077A1 true WO2004017077A1 (en) | 2004-02-26 |
Family
ID=9942394
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2003/003371 WO2004017077A1 (en) | 2002-08-15 | 2003-08-04 | Apparatus for detecting tampering with a utility meter |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP1532457A1 (en) |
CN (1) | CN1688887A (en) |
AU (1) | AU2003252966B2 (en) |
EG (1) | EG23466A (en) |
GB (1) | GB2391948B (en) |
IL (1) | IL166819A (en) |
MY (1) | MY135680A (en) |
NZ (1) | NZ538200A (en) |
WO (1) | WO2004017077A1 (en) |
ZA (1) | ZA200501303B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7644290B2 (en) | 2003-03-31 | 2010-01-05 | Power Measurement Ltd. | System and method for seal tamper detection for intelligent electronic devices |
EP2455767A1 (en) * | 2010-11-18 | 2012-05-23 | General Electric Company | Method, device and computer program product for magnetic tamper detection in a meter |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2409528B (en) * | 2003-12-24 | 2007-04-25 | Polymeters Response Internat L | Apparatus for detecting tampering with a utility meter |
FR2909452B1 (en) * | 2006-11-30 | 2009-02-20 | Actaris Sas Soc Par Actions Si | ELECTRIC ENERGY METER COMPRISING AT LEAST ONE INDUCTIVE TYPE CURRENT MEASURING SENSOR AND SENSOR THEREFOR |
DE102013219796A1 (en) * | 2013-09-30 | 2015-04-16 | Continental Automotive Gmbh | Pulse generator for a device for operating data acquisition, gear arrangement with a pulse generator, tachograph arrangement and method for generating an output signal for a device for operating data acquisition in a vehicle |
NO3071986T3 (en) | 2013-11-18 | 2018-06-02 | ||
US11650234B2 (en) | 2021-07-28 | 2023-05-16 | Honeywell International Inc. | Classification of magnet tampering conditions on a metering device |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2728896A1 (en) * | 1977-06-03 | 1978-12-07 | Landis & Gyr Ag | Electricity meter unauthorised magnetic interference detector - undergoes permanent change in magnetic field using either magnetically-operated leaf microswitch or resonant circuit |
WO1989010570A1 (en) * | 1988-04-21 | 1989-11-02 | Omega Electric Limited | Magnetic field detection system |
GB2347225A (en) * | 1999-02-25 | 2000-08-30 | C K Electronics Sdn Bhd | Electric utility meter with means to detect and report theft |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2906621A1 (en) * | 1979-02-21 | 1980-09-04 | Licentia Gmbh | Electricity supply meter with protection against tampering - has device to detect and compensate for the influence of foreign magnetic field using shorted turns |
GB2101782B (en) * | 1981-07-17 | 1985-11-27 | United Gas Ind Plc | Commodity meters |
US4707679A (en) * | 1984-10-22 | 1987-11-17 | Westinghouse Electric Corp. | Magnetic tamper detector |
US4859944A (en) * | 1987-08-25 | 1989-08-22 | Analog Devices, Inc. | Single-winding magnetometer with oscillator duty cycle measurement |
US5086292A (en) * | 1989-10-31 | 1992-02-04 | Iris Systems Inc. | Tamper detection device for utility meter |
US5642046A (en) * | 1994-06-08 | 1997-06-24 | Magknowledge Inc. | Low power magnetometer circuits requiring a single switching cycle |
US5910774A (en) * | 1996-09-18 | 1999-06-08 | Itron, Inc. | Sensor for count and tamper detection |
GB2334338A (en) * | 1998-02-12 | 1999-08-18 | Abb Metering Syst Ltd | Tamper detection in electro-mechanical electricity consumption meters |
US6014025A (en) * | 1998-02-24 | 2000-01-11 | Methode Electronics, Inc. | PWM flux-gate circuit for measuring magnitude and direction of a magnetic field |
US6218831B1 (en) * | 1999-05-19 | 2001-04-17 | Arthur D. Little, Inc. | Low power fluxgate circuit with current balance |
-
2002
- 2002-08-15 GB GB0219035A patent/GB2391948B/en not_active Expired - Lifetime
-
2003
- 2003-08-04 AU AU2003252966A patent/AU2003252966B2/en not_active Expired
- 2003-08-04 WO PCT/GB2003/003371 patent/WO2004017077A1/en not_active Application Discontinuation
- 2003-08-04 CN CN03824303.2A patent/CN1688887A/en active Pending
- 2003-08-04 NZ NZ538200A patent/NZ538200A/en not_active IP Right Cessation
- 2003-08-04 EP EP03787861A patent/EP1532457A1/en not_active Withdrawn
- 2003-08-04 ZA ZA200501303A patent/ZA200501303B/en unknown
- 2003-08-12 EG EG2003080787A patent/EG23466A/en active
- 2003-08-13 MY MYPI20033078A patent/MY135680A/en unknown
-
2005
- 2005-02-10 IL IL166819A patent/IL166819A/en unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2728896A1 (en) * | 1977-06-03 | 1978-12-07 | Landis & Gyr Ag | Electricity meter unauthorised magnetic interference detector - undergoes permanent change in magnetic field using either magnetically-operated leaf microswitch or resonant circuit |
WO1989010570A1 (en) * | 1988-04-21 | 1989-11-02 | Omega Electric Limited | Magnetic field detection system |
GB2347225A (en) * | 1999-02-25 | 2000-08-30 | C K Electronics Sdn Bhd | Electric utility meter with means to detect and report theft |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7644290B2 (en) | 2003-03-31 | 2010-01-05 | Power Measurement Ltd. | System and method for seal tamper detection for intelligent electronic devices |
EP2455767A1 (en) * | 2010-11-18 | 2012-05-23 | General Electric Company | Method, device and computer program product for magnetic tamper detection in a meter |
US8688407B2 (en) | 2010-11-18 | 2014-04-01 | General Electric Company | Method, device and computer program product for magnetic tamper detection in a meter |
Also Published As
Publication number | Publication date |
---|---|
EP1532457A1 (en) | 2005-05-25 |
GB2391948A (en) | 2004-02-18 |
CN1688887A (en) | 2005-10-26 |
MY135680A (en) | 2008-06-30 |
AU2003252966B2 (en) | 2008-07-17 |
AU2003252966A1 (en) | 2004-03-03 |
NZ538200A (en) | 2006-09-29 |
IL166819A (en) | 2010-11-30 |
IL166819A0 (en) | 2006-01-15 |
GB0219035D0 (en) | 2002-09-25 |
ZA200501303B (en) | 2006-10-25 |
GB2391948B (en) | 2006-11-15 |
EG23466A (en) | 2005-10-22 |
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