CN1637390B - Apparatus for detecting tampering with a utility meter - Google Patents
Apparatus for detecting tampering with a utility meter Download PDFInfo
- Publication number
- CN1637390B CN1637390B CN 200410103677 CN200410103677A CN1637390B CN 1637390 B CN1637390 B CN 1637390B CN 200410103677 CN200410103677 CN 200410103677 CN 200410103677 A CN200410103677 A CN 200410103677A CN 1637390 B CN1637390 B CN 1637390B
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- CN
- China
- Prior art keywords
- magnetic field
- utility meter
- coil
- instrument
- detector
- 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.)
- Expired - Fee Related
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- 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
Abstract
A utility meter, for detecting magnetic field in the utility meter and indicating the existence of super magnetic field, comprises a device for detecting utility tampering and a device for indicating the detection results, wherein a device is provided for at least part of the utility meter for shielding magnetic field, and a coil is provided for at least part of the shielding device which forms a magnetic field detector with the coil for detecting the existence of magnetic initiated from the outside of the meter.
Description
Technical field
The present invention relates to utility meter (utility meter), particularly relate to the equipment of this instrument of tamper detection.
Background technology
Be used to measure the instrument of the coal gas and the consumption of electricity as everyone knows, and many this kind instrument are according to the principle work of electromagnetism or electricity.Come this instrument is distorted by instrument being applied magnetic force, thus the record that reduces or in fact stop to consume.This causes a kind of suggestion, be this instrument or at least the sensing part of instrument electromagnetic screen is provided.The sensing part of instrument can be, for example, current transformer, instrument power transducer, is used for the relay that latchs of long-range pulse output relay that reads and/or pre-payment instrument.Yet,, want the people who distorts instrument to bring into use more and more stronger magnetic force in response to this shielding.
The application of the magnetic reed switch (reed switch) that is used to detect the external magnetic field has been arranged.But this detecting device is somewhat expensive, has the polarization sensitive of height and the stray magnetic field triggering that can be produced accidentally.Have several patents, the centreless transducer is used in its suggestion, so that instrument is avoided the influence of outside D.C. magnetic field.But this kind current inductor is influenced by AC magnetic field.US5343143 and FR2800167 disclose this kind current sensing means, and this current sensing means uses a magnetic shielding to prevent external action and improves magnetic flux chain (flux linkage).US4894610 has disclosed the coil of one group of two series connection and has eliminated the influence of external action field.GB2353598 has disclosed the application that the series coil that uses on the PCB is eliminated the influence of external field.But all these equipment all can not make metering circuit avoid the influence in strong or high degree of polarization applied field, wherein should be strong or the high degree of polarization applied field by wanting that the slack-off appropriator (fraudster) of instrument operation is arranged.
Summary of the invention
One object of the present invention is exactly to overcome the problem that relates in the prior art, and a kind of alternative of monitoring magnetic field in utility meter is provided, and there is superpower magnetic field in indication simultaneously.
When detecting a superpower magnetic field, preferably adopt some easy modes by instrument, for example write down the date and time of its generation, write down this fact.Similarly, can detect and write down the elimination of this ultrastrong magnetic field.This makes the supplier of public utilities (utility) can take suitable measure during this period, and it may comprise the utility service cost of raising.
Preferentially, this equipment uses a kind of shield assembly with a coil, and this coil is used to provide the induced signal that can calculate.
Owing in order to make the sensing part of external magnetic field induction utility meter, must at first make shield assembly saturated, use so this shield assembly can be used as the detecting device that detects ultrastrong magnetic field.
Description of drawings
In order more easily to understand the present invention, below in conjunction with accompanying drawing embodiments of the invention are described, accompanying drawing is as follows:
Fig. 1 shows the block scheme that has according to the utility meter of equipment of the present invention;
Fig. 2 shows according to the diagram of equipment of the present invention and represents;
Fig. 3 shows employed sensing element in the utility meter in the first embodiment according to the invention;
Fig. 4 shows according to second embodiment of the present invention.
Detailed Description Of The Invention
The preferred embodiments of the present invention are ammeters, and it can be a traditional electromagnetism instrument, also can be the more modern electronic instruments that a use current transformer detects electric quantity consumption.It should be noted that this only is a gageable utility example, and the present invention can use in dissimilar instrument, is used for writing down the consumption of different stream materials.
With reference to the accompanying drawings 1, it shows the block scheme of an ammeter, supposes that wherein it is an electronic instrument.Because electronic instrument does not use the instrument system that has disk, wherein disk depends on the speed rotation that sucks electric current (drawn current) with one and is driven, so electronic instrument is different from traditional electric mechanical instrument.Otherwise ammeter is measured consumption of electric by using current detector 10 to detect electric current in the mode of current transformer, and the output of current transformer is input to calculating section 11, and this calculating section 11 preferably is made up of microprocessor 11.Write down result calculated then and it is periodically stored in the storer 12.In addition, ammeter also can have the communicator of knowing in this area, allows to come the long-range ammeter that reads by communication link.Just make the ammeter standardization thus.
But well-known, the appearance of strong external magnetic field will influence the detection of electric current.The present invention is designed bucking current sensing element or any similar sensing part, makes it avoid conventional external field influence, and detects superpower existence, and it is invalid that this superpower field often makes self shield.This makes the existence of this kind field by the ammeter record, and preferably is instructed to stop the user who distorts ammeter to hope.This indication can be any indication of seeing and/or hearing of being fit to, and for example flicker shows or the flicker red light.Preferably can write down beginning and end that ultrastrong magnetic field exists, thereby utility supplier can take adequate measures.
Represent to be used to detect the existing preferred embodiment in magnetic field in Fig. 1 with magnetic field detector 20, wherein the output with magnetic field detector 20 is input to counting circuit 21.Counting circuit 21 comprises the output and the threshold value comparer relatively that are used for magnetic field detector, and wherein this threshold value is selected to indicate the existence of ultrastrong magnetic field.Counting circuit 21 is to storer 12 signals of output and write down the date and time of the beginning and the end of ultrastrong magnetic field.And if necessary, circuit 21 is gone back trigger indicator 22.
Referring now to Fig. 2,, Fig. 2 shows the preferred embodiment that is used to detect magnetic field.This device comprises an inductance L that is made of the iron core with a coil.
Iron core according to the present invention is made of at least a portion of magnetic shielding, and this magnetic shielding is used for the part (if not all) of shielding instrument element, and its work is subjected to the influence of strong external magnetic field.Coil preferably directly is wrapped on the part of this shielding, and Fig. 3 shows an exemplary embodiments of this device.
Fig. 3 shows an inductive switch element 25 and shielding 26, and wherein inductive switch element 25 can use in the public utilities ammeter, avoids the influence of strong external magnetic field and shield 26 protection switches 25.Only shield a part of 26 and need have a coil 27, and shield 26 and coil 27 be combined to form as shown in Figure 2 inductance L.
According to present embodiment, the shielding 26 of protection inductive switch element 25 is formed by main body 26a and extension 26b.The in fact L-shaped shape of extension 26b, and before arranging with L shaped shape, it stretches out from main body 26a.Preferably, have only the critical component of L shaped shape expansion 26a to have magnetic detection device, wherein this magnetic detection device comprises coil 27.
One end of this coil passes through a resistance eutral grounding, and should hold the output terminal that constitutes detecting device.The other end of this coil constitutes the input end of this magnetic detector, and imports a waveform from the signal generator shown in Fig. 1 23.In the present embodiment, fast-changing signal of signal generator output, square-wave signal for example, because the existence of inductance L, it is an approximate asymptote (or zigzag) waveform that this square-wave signal causes the output of coil usually.The rising of sawtooth wave and fall time is by the inductance value L of coil L decision, and will shield and be processed on the predeterminated level in magnetic field externally saturated with coil.In fact, owing to the sensing part for induction instrument, shielding 26 itself must be earlier saturated, so can relatively correctly detect saturated.And, because indication will appear when the screening ability of shielding suffers damage, so this device can detect the existence of strong external magnetic field.This saturated inductance value that greatly reduces, and the reduction of inductance value has increased the pace of change of current output waveform slope, thus between the period of saturation, square wave can be sent to output terminal from input end more accurately.It should be understood that and to select the magnetic sensor circuit made with different saturated material specially, make it can not detect occasioned stray magnetic field.The average that the output of coil is input in the counting circuit 21 is determined circuit, and it should be understood that average under the normal condition will be far smaller than the output average when the saturated ultrastrong magnetic field of coil is existed.The output of computation of mean values circuit then.By adopting a comparator circuit to come to export simply and predetermined threshold value compares, can realize this calculating at an easy rate.
Fig. 4 is an alternative embodiment of the invention, shows induction current transformer 35, and it can use in a utility meter.Shielding 26 protection current transformers 35 are avoided the influence of strong external magnetic field.As above an embodiment is described, only need provide coil 27 for shielding a part of 26, shielding 26 and coil 27 be combined to form the inductance L shown in Fig. 2.The details of current transformer itself wherein is not described, but in the present embodiment, current transformer links to each other with a primary conductor, and secondary output end as shown in FIG. is provided.
In the present embodiment, form shielding 26, make it that main body 26a and an extension 26b be arranged according to the mode similar to previous embodiment.In this specific embodiment, extension 26b is the shape of " L ", and it forms and makes an arm of extension extend out from main body 26a, and another arm of extension has the magnetic detection device that comprises coil 27.
Preferably, when an instrument is built into a magnetic field detector circuit merging, after instrument is made the back initial start-up, the magnetic field around will writing down, and this will provide a reference level, be added with a skew that is used to indicate ultrastrong magnetic field on it.
In addition, be, the magnetic test coil with shield assembly can detect AC magnetic field and D.C. magnetic field with should be appreciated that, and make shield assembly can detect omnidirectional magnetic field.
Relate to the shielding that is applied to on-off element 25 or current transformer 35 although it should be understood that above described two embodiment, utility meter can comprise arbitrary in one or more these two elements.And utility meter can comprise that these two elements and/or any other are subjected to the element of external magnetic field induction.In addition, shielding can be applied in the part of whole utility meter or utility meter.And, also can provide shielding by some induction regions for instrument.
Imagine the various changes of this circuit, and each assembly of instrument can be shared with magnetic field detector.For example, do not use a comparer that is in threshold value, can use microprocessor to calculate the output of detecting device.This just needs an available independent A/D channel.And, by adding an additional coils that is provided detection waveform on it, can change the current transformer or the supply convertor of an electronic instrument, and not have the detecting device iron core of a separation.But this may need to be used for some additional calculations that read of actual instrument, and the mistake that causes with the appearance of avoiding owing to detection waveform reads.
Claims (5)
1. utility meter, comprise a device and a device that is used to indicate described testing result that is used to detect public utilities consumption, wherein the part of described at least utility meter has a shield assembly that is used for armoured magnetic field, and wherein the part of described at least shield assembly is equipped with a coil, the described part of wherein said shield assembly and described coil form a detector for magnetic field, and this detector for magnetic field is used for detecting the existence in a magnetic field of initiating from the outside of described instrument.
2. utility meter as claimed in claim 1 comprises the memory storage that is used to store described magnetic field detection result.
3. utility meter as claimed in claim 2, wherein said detector for magnetic field is used to indicate the elimination in described magnetic field.
4. utility meter as claimed in claim 1 comprises a real-time clock and a memory storage that is used for storing date and/or time, wherein on described date and/or time durations the detection in described magnetic field has taken place.
5. as the described utility meter of any one claim in the above-mentioned claim, wherein said detector for magnetic field comprises a waveform generator that detection waveform is applied to described coil.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0330057.1 | 2003-12-24 | ||
| GB0330057A GB2409528B (en) | 2003-12-24 | 2003-12-24 | Apparatus for detecting tampering with a utility meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1637390A CN1637390A (en) | 2005-07-13 |
| CN1637390B true CN1637390B (en) | 2010-04-28 |
Family
ID=31503204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410103677 Expired - Fee Related CN1637390B (en) | 2003-12-24 | 2004-12-24 | Apparatus for detecting tampering with a utility meter |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN1637390B (en) |
| GB (1) | GB2409528B (en) |
| MY (1) | MY138974A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103592484B (en) * | 2013-11-04 | 2016-04-20 | 江苏林洋能源股份有限公司 | A kind of electricity anti-theft method for anti-strong magnet, electronic electric energy meter being produced to error effect |
| PT3071986T (en) * | 2013-11-18 | 2018-04-05 | E Distribuzione S P A | Electricity meter with fault detection mechanism and fault detection method |
| CN113589010A (en) * | 2021-07-30 | 2021-11-02 | 万安裕高电子科技有限公司 | Intelligent ammeter capable of preventing strong magnetic interference |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5486755A (en) * | 1994-12-27 | 1996-01-23 | General Electric Company | Electronic meter having anti-tampering magnetic shield |
| CN2305674Y (en) * | 1997-06-20 | 1999-01-27 | 卢真达 | Energy saving electric meter for preventing frandulent use of electricity |
| GB2334338A (en) * | 1998-02-12 | 1999-08-18 | Abb Metering Syst Ltd | Tamper detection in electro-mechanical electricity consumption meters |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5910774A (en) * | 1996-09-18 | 1999-06-08 | Itron, Inc. | Sensor for count and tamper detection |
| GB2391948B (en) * | 2002-08-15 | 2006-11-15 | Pri Ltd | Apparatus for detecting tampering with a utility meter |
-
2003
- 2003-12-24 GB GB0330057A patent/GB2409528B/en not_active Expired - Lifetime
-
2004
- 2004-11-25 MY MYPI20044883 patent/MY138974A/en unknown
- 2004-12-24 CN CN 200410103677 patent/CN1637390B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5486755A (en) * | 1994-12-27 | 1996-01-23 | General Electric Company | Electronic meter having anti-tampering magnetic shield |
| CN2305674Y (en) * | 1997-06-20 | 1999-01-27 | 卢真达 | Energy saving electric meter for preventing frandulent use of electricity |
| GB2334338A (en) * | 1998-02-12 | 1999-08-18 | Abb Metering Syst Ltd | Tamper detection in electro-mechanical electricity consumption meters |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2409528B (en) | 2007-04-25 |
| GB2409528A (en) | 2005-06-29 |
| CN1637390A (en) | 2005-07-13 |
| MY138974A (en) | 2009-08-28 |
| GB0330057D0 (en) | 2004-02-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100428 Termination date: 20141224 |
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| EXPY | Termination of patent right or utility model |