WO2003065055A2 - Magnetic field detection system for an electricity meter - Google Patents
Magnetic field detection system for an electricity meter Download PDFInfo
- Publication number
- WO2003065055A2 WO2003065055A2 PCT/SI2003/000003 SI0300003W WO03065055A2 WO 2003065055 A2 WO2003065055 A2 WO 2003065055A2 SI 0300003 W SI0300003 W SI 0300003W WO 03065055 A2 WO03065055 A2 WO 03065055A2
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- WO
- WIPO (PCT)
- Prior art keywords
- magnetic field
- field density
- measuring device
- threshold
- density
- Prior art date
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Classifications
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- 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
- Measuring device for example an electric energy meter, adapted for avoiding fraudulent use through an application of an interefering magnetic field
- the invention concerns a measuring device, for example an electric energy meter, adapted for avoiding fraudulent use through an application of an interefering magnetic field within a sealed measuring device casing with field density above a certain threshold so that the fraudulent use is signalled, and preferably, is indicated in an automatically non-erasable manner.
- a measuring device for example an electric energy meter
- an electric energy meter When in use, an electric energy meter, may be improperly manipulated by means of an interefering magnetic field which penetrates a sealed measuring device casing and influences measuring accuracy and its full functionality. This influence is tried to be reduced by avoiding the use of ferromagnetic materials for some components or by increasing the distance of vital measuring device components from the positions on its casing, suitable to exert influence with an interefering magnetic field.
- the first measure has an unfavourable effect on the operating life of the measuring device and the second measure on its dimension. Additional ferromagnetic screens or shields may be inserted or even a cast steel casing used, yet harmful influence of the interefering magnetic field is merely reduced. In the first place, electricity distributors lack a possibility to prove the fraudulent measuring device use through an application of an interefering magnetic field or at least to detect that such fraudulent use is proceeding.
- the technical problem to be solved by the present invention is to propose a measuring device - for example an electric energy meter, adapted for avoiding fraudulent use through an application of an interefering magnetic field - that will indicate presence of a magnetic field within a sealed measuring device casing, said magnetic field having field density above a certain threshold, the indication of such detection, however, should be preferably non-erasable in an automatic manner.
- a measuring device for example an electric energy meter, adapted for avoiding fraudulent use through an application of an interefering magnetic field and according to the preferred first variant a measuring device of the invention characterized in that at least one magnetic field density threshold detector is placed within a sealed measuring device casing and that the magnetic field density threshold detector is connected to an automatically non-erasable indicating device, so that thereby an automatically non-erasable indication of a detection of a magnetic field with field density above a threshold field density is performed.
- the first variant of the measuring device of the invention is proposed in eight embodiments, features whereof are characterized in dependent claims 2 to 9.
- a measuring device for example an electric energy meter, adapted for avoiding fraudulent use through an application of an interefering magnetic field and according to the second variant the measuring device of the invention characterized in that at least one magnetic field density threshold detector constructed as a sealed reed switch is placed within a sealed measuring device casing and that the magnetic field density threshold detector is connected to a voltage source in series with a parallelly connected warning acoustic source and warning light source so that said warning sources indicate whether magnetic field with a field density above the threshold field density is present within the measuring device casing.
- the measuring device by the invention adapted for avoiding fraudulent use through an application of an interefering magnetic field, makes it possible according to the embodiments of the first variant to prove it beyond ambiguity whether its interior was exposed to an interfering magnetic field with such field density that the functioning of the measuring device was incorrect or disturbed.
- Figs. 1, 2a, 2b, 4a, 4b, 5, 6, 7 and 8 a measuring device adapted for avoiding fraudulent use through an application of an interefering magnetic field in seven embodiments according to the first variant of the invention
- Fig. 3 a measuring device adapted for avoiding fraudulent use through an application of an interefering magnetic field in an embodiment according to the second variant of the invention.
- a measuring device of the invention for example an electric energy meter, for avoiding fraudulent use through an application of an interefering magnetic field (Figs. 1, 2a, 2b, 4a, 4b and 5-8) is adapted in a way to indicate, whether inside a sealed casing C of the measuring device a magnetic field with field density above a threshold field density has been detected, and this indication is automatically non-erasable.
- This magnetic field density threshold detector is connected to an automatically non-erasable indicating device 3a; 3b; 3d; 2e'; 5f; 3g, 3g'; lh', lh", so that hereby an automatically non-erasable indication of detection of the magnetic field with field density above threshold field density is performed.
- a release la', la is used as the magnetic field density threshold detector la', la", said release being implemented as a ferromagnetic flexible strip fixed at one end.
- the ferromagnetic flexible strip Under the influence of the transversal magnetic field - in figures illustrated by a horseshoe magnet M - with field density above the threshold field density the ferromagnetic flexible strip is bent enough so that its supporting part 2a', 2a" is drawn away from below an end of an indicating drop strip 3a, related to said release la', la".
- the drop strip 3 a is rotatingly (arrow Aa) fastened at its other end and functions as an indicator of a detected magnetic field with field density above the threshold field density.
- the drop strip 3a may be provided with a label "xyz” (ATTENTION - MAGNET) and may be in an initial position before dropping covered with a warning plate 4a which may also be provided with a label “XYZ” (MAGNET PROTECTED); after dropping the drop strip 3 a remains in the new position and is visible through a front panel FP of the casing C. Both labels are in a warning colour.
- xyz ATTENTION - MAGNET
- XYZ MAGNET PROTECTED
- a release lb in the form of a ferromagnetic flexible strip fixed at one end is used as the magnetic field density threshold detector lb like in the first embodiment.
- the ferromagnetic flexible strip of the release lb is gradually twisted around its axis, so that it may be bent under the force in a magnetic field from different directions. Influenced by the magnetic field with field density above the threshold field density the supporting part 2b is drawn away from below the indicating strip 3b (Fig.
- the magnetic field density threshold detector Id is constructed as a sealed reed switch Id (Fig. 4a).
- the sealed reed switch Id is connected to a voltage source in series with a protecting resistor 2d and an indicating working resistor 3d.
- the sealed reed switch Id closes contacts and the indicating working resistor 3d, visible through a window in a front face plate FP of the measuring device (Fig. 4b), permanently changes its colour after a short time and fuses.
- the coloured working resistor 3d functions as an indicator indicating that a magnetic field with field density above the threshold field density has been detected.
- the magnetic field density threshold detector le is constructed as a sealed reed switch le (Fig. 5).
- the sealed reed switch le is connected to a voltage source in series with a fuse 2e and its contacts are closed under the influence of the magnetic field with field density above the threshold field density. At the same time the fuse 2e is fused. In this way detection of the magnetic field with field density above the threshold field density is recorded.
- the sealed reed switch le is shunted by a light emitting diode le ⁇ which shines when the magnetic field is below the threshold value
- the fuse 2e is shunted by a light emitting diode 2e', which shines after the magnetic field with field density above the threshold field density has been detected and the fuse 2e has fused.
- the magnetic field density threshold detector If is constructed as a sealed reed switch If (Fig. 6).
- the sealed reed switch If is connected to a voltage source in series with a protecting resistor 2f and a heating working resistor 3f.
- the contacts of the sealed reed switch If close under the influence of the magnetic field with field density above the threshold field density.
- the heating working resistor 3 f warms up a nearby positioned bimetallic strip 4f so far that it is drawn away from below an end of an indicating drop strip 5f.
- the indicating drop strip 5f is rotatingly fastened at its other end, so that it drops rotatingly in the direction of the arrow Af.
- the lowered indicating drop strip 5f indicates that the magnetic field with field density above the threshold field density has been detected.
- the magnetic field density threshold detector is constructed as a magnetic field sensor lg, the output of which is connected to the input of an hysteretic level detector 2g, the output of which is connected to the input of a read-only memory 3g, e. g. an EEPROM (Fig. 7).
- a magnetic field sensor lg a Hall sensor, a magneto- transistor, a magnetoresistor sensor and similar sensors may be used.
- a momentary presence of the magnetic field with field density above the threshold field density is indicated by shining of a light emitting diode 2g' connected to the detector 2g, at least single excess of the threshold field density, however, is stored in the read-only memory 3g and permanently indicated by permanently shining of a light emitting diode 3g' which is connected to the read-only memory 3g.
- the magnetic field density threshold detector and at the same time the automatically non-erasable indicating device are constructed as only one or several ferromagnetic material foils lh', lh" fastened inside the casing C (Fig. 8).
- the foils lh', lh” may be magnetized.
- a change in the magnetic moment of said nonresilient ferromagnetic material foils due to a changed curvature or magnetization thereof - it may be detected also through the casing C of the measuring device casing C by means of a magnetic flux meter - proves that a magnetic field with field density above the threshold field density has been detected at least once.
- the magnetic field density threshold detector and at the same time the automatically non-erasable indicating device is constructed as a layer of such medium that on its surface contour fields of equal magnetic field density become visible, and at the same time magnetical hard bodies are arranged below said layer (not shown).
- the measuring device of the invention is put to use with the unmagnetized magnetical hard bodies of said arrangement. When a magnetic field appears within the measuring device casing, the magnetical hard bodies get magnetized - thereafter they maintain the acquired magnetic moment - and on the surface of said layer contour fields of the magnetical hard bodies situated below the surface become visible.
- the measuring device for example an electric energy meter, according to the second variant of the invention for avoiding fraudulent use through an application of an interefering magnetic field (Fig. 3) is adapted in a way to provide indication whether inside the casing C of the measuring device an interefering magnetic field with field density above the threshold field density is detected.
- At least one magnetic field density threshold detector lc constructed as a sealed reed switch lc, for example in direction of three coordinate axes, which may respond to an interefering magnetic field Be in different directions.
- the sealed reed switch lc is connected to a voltage source in series with a parallelly connected warning acoustic source 3 c' and warning light source 3 c". They warn of a presence of a magnetic field with field density above the threshold field density.
- the functioning of the measuring device adapted by the invention for avoiding fraudulent use through an application of an interefering magnetic field, is certainly evident from the above disclosure, however, it must be explained that as a threshold value for a magnetic field density, established inside the sealed casing of the measuring device, the value is taken which still allows correct and undisturbed functioning of the measuring device functioning and which is deduced from instructions of international or national standards.
Abstract
In a measuring device, adapted for avoiding fraudulent use through an application of an interefering magnetic field, a magnetic field density threshold detector (1a', 1a'') is constructed as a release (1a', 1a'') made as a ferromagnetic flexible strip which is fixed at one end and which, influenced by the magnetic field with a field density above threshold field density, is drawn away from below an end of an indicating drop strip (3a), which is rotatingly fastened at its other end and which indicates whether magnetic field with a field density above threshold field density has been detected.In preferred embodiments of the measuring device it is possible to prove beyond ambiguity whether its interior was exposed to an interfering magnetic field with such field density that the functioning of the measuring device was incorrect or disturbed.
Description
Measuring device, for example an electric energy meter, adapted for avoiding fraudulent use through an application of an interefering magnetic field
The invention concerns a measuring device, for example an electric energy meter, adapted for avoiding fraudulent use through an application of an interefering magnetic field within a sealed measuring device casing with field density above a certain threshold so that the fraudulent use is signalled, and preferably, is indicated in an automatically non-erasable manner.
When in use, an electric energy meter, may be improperly manipulated by means of an interefering magnetic field which penetrates a sealed measuring device casing and influences measuring accuracy and its full functionality. This influence is tried to be reduced by avoiding the use of ferromagnetic materials for some components or by increasing the distance of vital measuring device components from the positions on its casing, suitable to exert influence with an interefering magnetic field. The first measure has an unfavourable effect on the operating life of the measuring device and the second measure on its dimension. Additional ferromagnetic screens or shields may be inserted or even a cast steel casing used, yet harmful influence of the interefering magnetic field is merely reduced. In the first place, electricity distributors lack a possibility to prove the fraudulent measuring device use through an application of an interefering magnetic field or at least to detect that such fraudulent use is proceeding.
The technical problem to be solved by the present invention is to propose a measuring device - for example an electric energy meter, adapted for avoiding fraudulent use
through an application of an interefering magnetic field - that will indicate presence of a magnetic field within a sealed measuring device casing, said magnetic field having field density above a certain threshold, the indication of such detection, however, should be preferably non-erasable in an automatic manner.
Said technical problem is solved by a measuring device, for example an electric energy meter, adapted for avoiding fraudulent use through an application of an interefering magnetic field and according to the preferred first variant a measuring device of the invention characterized in that at least one magnetic field density threshold detector is placed within a sealed measuring device casing and that the magnetic field density threshold detector is connected to an automatically non-erasable indicating device, so that thereby an automatically non-erasable indication of a detection of a magnetic field with field density above a threshold field density is performed.
The first variant of the measuring device of the invention is proposed in eight embodiments, features whereof are characterized in dependent claims 2 to 9.
Said technical problem is also solved by a measuring device, for example an electric energy meter, adapted for avoiding fraudulent use through an application of an interefering magnetic field and according to the second variant the measuring device of the invention characterized in that at least one magnetic field density threshold detector constructed as a sealed reed switch is placed within a sealed measuring device casing and that the magnetic field density threshold detector is connected to a voltage source in series with a parallelly connected warning acoustic source and warning light source so that said warning sources indicate whether magnetic field with a field density above the threshold field density is present within the measuring device casing.
The measuring device, by the invention adapted for avoiding fraudulent use through an application of an interefering magnetic field, makes it possible according to the embodiments of the first variant to prove it beyond ambiguity whether its interior was exposed to an interfering magnetic field with such field density that the functioning of the measuring device was incorrect or disturbed.
The invention will now be disclosed in detail by way of description of embodiments thereof and with reference to the accompanying drawings representing in: Figs. 1, 2a, 2b, 4a, 4b, 5, 6, 7 and 8 a measuring device adapted for avoiding fraudulent use through an application of an interefering magnetic field in seven embodiments according to the first variant of the invention, and Fig. 3 a measuring device adapted for avoiding fraudulent use through an application of an interefering magnetic field in an embodiment according to the second variant of the invention.
A measuring device of the invention, for example an electric energy meter, for avoiding fraudulent use through an application of an interefering magnetic field (Figs. 1, 2a, 2b, 4a, 4b and 5-8) is adapted in a way to indicate, whether inside a sealed casing C of the measuring device a magnetic field with field density above a threshold field density has been detected, and this indication is automatically non-erasable.
Within the sealed casing C of the measuring device at least one magnetic field density threshold detector la', la"; lb; Id; le; If; lg, 2g; lh', lh" is placed. This magnetic field density threshold detector is connected to an automatically non-erasable indicating device 3a; 3b; 3d; 2e'; 5f; 3g, 3g'; lh', lh", so that hereby an automatically non-erasable
indication of detection of the magnetic field with field density above threshold field density is performed.
In the first embodiment (Fig. 1) of the measuring device according to the first variant of the invention a release la', la" is used as the magnetic field density threshold detector la', la", said release being implemented as a ferromagnetic flexible strip fixed at one end. Under the influence of the transversal magnetic field - in figures illustrated by a horseshoe magnet M - with field density above the threshold field density the ferromagnetic flexible strip is bent enough so that its supporting part 2a', 2a" is drawn away from below an end of an indicating drop strip 3a, related to said release la', la". The drop strip 3 a is rotatingly (arrow Aa) fastened at its other end and functions as an indicator of a detected magnetic field with field density above the threshold field density. The drop strip 3a may be provided with a label "xyz" (ATTENTION - MAGNET) and may be in an initial position before dropping covered with a warning plate 4a which may also be provided with a label "XYZ" (MAGNET PROTECTED); after dropping the drop strip 3 a remains in the new position and is visible through a front panel FP of the casing C. Both labels are in a warning colour.
In the second embodiment (Fig. 2a and 2b) of the measuring device according to the first variant of the invention a release lb in the form of a ferromagnetic flexible strip fixed at one end is used as the magnetic field density threshold detector lb like in the first embodiment. Preferably, the ferromagnetic flexible strip of the release lb is gradually twisted around its axis, so that it may be bent under the force in a magnetic field from different directions. Influenced by the magnetic field with field density above the threshold field density the supporting part 2b is drawn away from below the indicating strip 3b (Fig. 2a) which, acted upon by a force of a spring 4b, slides in a direction of an arrow Ab past a window 5b in a front face plate FP of the measuring device. Within the window 5b a loud coloured warning field 6b of the strip 3b remains,
indicating (label X) that a magnetic field with field density above the threshold field density has been detected (Fig. 2b).
In the third embodiment (Fig. 4a and 4b) of the measuring device according to the first variant of the invention the magnetic field density threshold detector Id is constructed as a sealed reed switch Id (Fig. 4a). The sealed reed switch Id is connected to a voltage source in series with a protecting resistor 2d and an indicating working resistor 3d. Under the influence of the magnetic field with field density above the threshold field density the sealed reed switch Id closes contacts and the indicating working resistor 3d, visible through a window in a front face plate FP of the measuring device (Fig. 4b), permanently changes its colour after a short time and fuses. In this way the coloured working resistor 3d functions as an indicator indicating that a magnetic field with field density above the threshold field density has been detected.
In the fourth embodiment of the measuring device according to the first variant of the invention the magnetic field density threshold detector le is constructed as a sealed reed switch le (Fig. 5). The sealed reed switch le is connected to a voltage source in series with a fuse 2e and its contacts are closed under the influence of the magnetic field with field density above the threshold field density. At the same time the fuse 2e is fused. In this way detection of the magnetic field with field density above the threshold field density is recorded. Preferably, the sealed reed switch le is shunted by a light emitting diode le\ which shines when the magnetic field is below the threshold value, and the fuse 2e is shunted by a light emitting diode 2e', which shines after the magnetic field with field density above the threshold field density has been detected and the fuse 2e has fused.
In the fifth embodiment of the measuring device according to the first variant of the invention the magnetic field density threshold detector If is constructed as a sealed
reed switch If (Fig. 6). The sealed reed switch If is connected to a voltage source in series with a protecting resistor 2f and a heating working resistor 3f. The contacts of the sealed reed switch If close under the influence of the magnetic field with field density above the threshold field density. Then the heating working resistor 3 f warms up a nearby positioned bimetallic strip 4f so far that it is drawn away from below an end of an indicating drop strip 5f. The indicating drop strip 5f is rotatingly fastened at its other end, so that it drops rotatingly in the direction of the arrow Af. The lowered indicating drop strip 5f indicates that the magnetic field with field density above the threshold field density has been detected.
In the sixth embodiment of the measuring device according to the first variant of the invention the magnetic field density threshold detector is constructed as a magnetic field sensor lg, the output of which is connected to the input of an hysteretic level detector 2g, the output of which is connected to the input of a read-only memory 3g, e. g. an EEPROM (Fig. 7). As the magnetic field sensor lg a Hall sensor, a magneto- transistor, a magnetoresistor sensor and similar sensors may be used. A momentary presence of the magnetic field with field density above the threshold field density is indicated by shining of a light emitting diode 2g' connected to the detector 2g, at least single excess of the threshold field density, however, is stored in the read-only memory 3g and permanently indicated by permanently shining of a light emitting diode 3g' which is connected to the read-only memory 3g.
In the seventh embodiment of the measuring device according to the first variant of the invention the magnetic field density threshold detector and at the same time the automatically non-erasable indicating device are constructed as only one or several ferromagnetic material foils lh', lh" fastened inside the casing C (Fig. 8). The foils lh', lh" may be magnetized. A change in the magnetic moment of said nonresilient ferromagnetic material foils due to a changed curvature or magnetization thereof - it
may be detected also through the casing C of the measuring device casing C by means of a magnetic flux meter - proves that a magnetic field with field density above the threshold field density has been detected at least once.
In the eighth embodiment of the measuring device according to the first variant of the invention the magnetic field density threshold detector and at the same time the automatically non-erasable indicating device is constructed as a layer of such medium that on its surface contour fields of equal magnetic field density become visible, and at the same time magnetical hard bodies are arranged below said layer (not shown). The measuring device of the invention is put to use with the unmagnetized magnetical hard bodies of said arrangement. When a magnetic field appears within the measuring device casing, the magnetical hard bodies get magnetized - thereafter they maintain the acquired magnetic moment - and on the surface of said layer contour fields of the magnetical hard bodies situated below the surface become visible.
The measuring device, for example an electric energy meter, according to the second variant of the invention for avoiding fraudulent use through an application of an interefering magnetic field (Fig. 3) is adapted in a way to provide indication whether inside the casing C of the measuring device an interefering magnetic field with field density above the threshold field density is detected.
Within the casing C of the measuring device there is at least one magnetic field density threshold detector lc constructed as a sealed reed switch lc, for example in direction of three coordinate axes, which may respond to an interefering magnetic field Be in different directions. The sealed reed switch lc is connected to a voltage source in series with a parallelly connected warning acoustic source 3 c' and warning light source
3 c". They warn of a presence of a magnetic field with field density above the threshold field density.
The functioning of the measuring device, adapted by the invention for avoiding fraudulent use through an application of an interefering magnetic field, is certainly evident from the above disclosure, however, it must be explained that as a threshold value for a magnetic field density, established inside the sealed casing of the measuring device, the value is taken which still allows correct and undisturbed functioning of the measuring device functioning and which is deduced from instructions of international or national standards.
Claims
1. Measuring device, for example an electric energy meter, adapted for avoiding fraudulent use through an application of an interefering magnetic field, characterized in that at least one magnetic field density threshold detector (la', la"; lb; Id; le; If; lg, 2g; lh', lh") is placed within a sealed casing (C) of the measuring device, and that a magnetic field density threshold detector (la', la"; lb; Id; le; If; lg, 2g; lh', lh") is connected to an automatically non-erasable indicating device (3a; 3b; 3d; 2e'; 5f; 3g, 3g'; lh', lh"), so that hereby an automatically non-erasable indication of detection of the magnetic field with field density above threshold field density is performed.
2. Measuring device as recited in claim 1, characterized in that the magnetic field density threshold detector (la1, la") is constructed as a release (la', la") made as a ferromagnetic flexible strip fixed at one end and which, influenced by the magnetic field with field density above the threshold field density, is drawn away from below an end of an indicating drop strip (3a), which is related to said release (la1, la") and which is rotatingly fastened at its other end and which indicates whether magnetic field with field density above threshold field density has been detected.
3. Measuring device as recited in claim 1, characterized in that the magnetic field density threshold detector (lb) is constructed as a release (lb) made as a ferromagnetic flexible strip fixed at one end and which, influenced by the magnetic field with field density above threshold field density, is drawn away from below an indicating strip (3b) which, acted upon by a force of a spring (4b) slides past a window (5b) in a front face plate (FP) of the casing (C), so that within the window (5b) a warning field (6b) remains, indicating whether magnetic field with field density above threshold field density has been detected.
4. Measuring device as recited in claim 1, characterized in that the magnetic field density threshold detector (Id) is constructed as a sealed reed switch (Id) connected to a voltage source in series with an indicating working resistor (3d) and which is closed under the influence of the magnetic field with a field density above threshold field density, causing the indicating working resistor (3d) to permanently change its colour, thereby indicating whether magnetic field with field density above threshold field density has been detected.
5. Measuring device as recited in claim 1, characterized in that the magnetic field density threshold detector (le) is constructed as a sealed reed switch (le) connected to a voltage source in series with a fuse (2e) and which is closed under the influence of the magnetic field with field density above threshold field density, causing the fuse (2e) to burn out, thereby indicating whether magnetic field with field density above threshold field density has been detected.
6. Measuring device as recited in claim 1, characterized in that the magnetic field density threshold detector (If) is constructed as a sealed reed switch (If) connected to a voltage source in series with a heating working resistor (3f) and which is closed under the influence of the magnetic field with field density above threshold field density, causing the heating working resistor (3f) to heat up a nearby positioned bimetallic strip (4f) which, when heated up, is drawn away from below an end of an indicating drop strip (5f) which is rotatingly fastened at its other end and which indicates whether magnetic field with field density above threshold field density has been detected.
7. Measuring device as recited in claim 1, characterized in that the magnetic field density threshold detector (lg, 2g) is constructed as a magnetic field sensor (lg), the output of which is connected to the input of a hysteretic level detector (2g), the output of which is connected to the input of a read-only memory (3g) indicating whether magnetic field with field density above threshold field density has been detected.
8. Measuring device as recited in claim 1, characterized in that the magnetic field density threshold detector and at the same time the automatically non-erasable indicating device are constructed as a ferromagnetic material foil (lh', lh") fastened inside the casing (C), a change in the foil magnetic moment indicating whether magnetic field with field density above threshold field density has been detected.
9. Measuring device as recited in claim 1, characterized in that the magnetic field density threshold detector and at the same time the automatically non-erasable indicating device is constructed as a layer of such medium that contour fields of equal magnetic field density become visible on its surface, and as an arrangement of magnetical hard bodies, which is placed below said layer, and the appearance of said layer surface indicates whether magnetic field has been detected.
10. Measuring device, for example an electric energy measuring device, adapted for avoiding fraudulent use through an application of an interefering magnetic field, characterized in that at least one magnetic field density threshold detector (lc) constructed as a sealed reed switch (lc) is placed within a sealed casing (C) measuring device, and that a magnetic field density threshold detector (lc) is connected to a voltage source in series with a parallelly connected warning acoustic source (3 c1) and warning light source (3 c") so that said warning sources indicate whether magnetic field with field density above threshold field density is present within the casing (C) of the measuring device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2003238703A AU2003238703A1 (en) | 2002-01-31 | 2003-01-30 | Magnetic field detection system for an electricity meter |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SI200200022A SI21151A (en) | 2002-01-31 | 2002-01-31 | Meter, for example power meter, adapted to prevent misuse by interfering magnetic fields |
| SIP-200200022 | 2002-01-31 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| WO2003065055A2 true WO2003065055A2 (en) | 2003-08-07 |
| WO2003065055A3 WO2003065055A3 (en) | 2004-03-18 |
| WO2003065055B1 WO2003065055B1 (en) | 2004-04-22 |
Family
ID=27656695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/SI2003/000003 WO2003065055A2 (en) | 2002-01-31 | 2003-01-30 | Magnetic field detection system for an electricity meter |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU2003238703A1 (en) |
| SI (1) | SI21151A (en) |
| WO (1) | WO2003065055A2 (en) |
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| CN102565475A (en) * | 2012-01-18 | 2012-07-11 | 福建省电力有限公司三明电业局 | Electricity stealing prevention device for electric energy meter |
| US8305232B2 (en) | 2009-11-19 | 2012-11-06 | Silver Spring Networks, Inc. | Utility network interface device configured to detect and report abnormal operating condition |
| US8368555B2 (en) | 2009-11-19 | 2013-02-05 | Silver Spring Networks, Inc. | Utility network interface device configured to detect and report abnormal operating condition |
| US8423637B2 (en) | 2010-08-06 | 2013-04-16 | Silver Spring Networks, Inc. | System, method and program for detecting anomalous events in a utility network |
| CN103257257A (en) * | 2013-05-03 | 2013-08-21 | 山东菲达电器有限公司 | Electricity larceny prevention low-voltage measuring cabinet |
| ITRM20130229A1 (en) * | 2013-04-17 | 2014-10-18 | Bitron Spa | DETECTED OR MEASURED MEASUREMENT EQUIPMENT. |
| EP2980591A1 (en) * | 2014-07-30 | 2016-02-03 | Sagemcom Energy & Telecom Sas | Meter such as an electric meter |
| CN105425004A (en) * | 2015-12-23 | 2016-03-23 | 深圳市金正方科技股份有限公司 | Electric energy measuring equipment and method and device for detecting electricity stealing event of same |
| WO2017182087A1 (en) * | 2016-04-21 | 2017-10-26 | Consejo Superior De Investigaciones Cientificas (Csic) | Device for detecting fraud in meters and related method |
| CN110658486A (en) * | 2019-09-27 | 2020-01-07 | 杭州海兴电力科技股份有限公司 | Antimagnetic detection device of secondary electric power metering equipment |
| EP3537162A4 (en) * | 2016-11-01 | 2020-07-01 | Omron Corporation | Electricity meter and electricity meter fire outbreak location identification method |
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| 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 |
| 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 |
| US4542337A (en) * | 1982-09-30 | 1985-09-17 | Honeywell Inc. | Electro-mechanical anti-tampering device for electric meters |
| US5086292A (en) * | 1989-10-31 | 1992-02-04 | Iris Systems Inc. | Tamper detection device for utility meter |
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Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008078108A3 (en) * | 2006-12-27 | 2008-08-28 | Polymeters Response Internat L | Magnetic field indicator and utility meter incorporating the same |
| WO2008078108A2 (en) * | 2006-12-27 | 2008-07-03 | Polymeters Response International Limited | Magnetic field indicator and utility meter incorporating the same |
| CN101865957B (en) * | 2009-04-14 | 2012-06-27 | 深圳长城开发科技股份有限公司 | Method and device for detecting electric discharge interference and electric energy meter provided with the device |
| US8368555B2 (en) | 2009-11-19 | 2013-02-05 | Silver Spring Networks, Inc. | Utility network interface device configured to detect and report abnormal operating condition |
| WO2011062627A3 (en) * | 2009-11-19 | 2012-01-05 | Silver Spring Networks, Inc. | Utility network interface device configured to detect and report abnormal operating condition |
| US8305232B2 (en) | 2009-11-19 | 2012-11-06 | Silver Spring Networks, Inc. | Utility network interface device configured to detect and report abnormal operating condition |
| US9608887B2 (en) | 2010-08-06 | 2017-03-28 | Silver Spring Networks, Inc. | System, method and program for detecting anomalous events in a utility network |
| US8966069B2 (en) | 2010-08-06 | 2015-02-24 | Silver Spring Networks, Inc. | System, method and program for detecting anomalous events in a utility network |
| US10193778B2 (en) | 2010-08-06 | 2019-01-29 | Itron Networked Solutions, Inc. | System, method and program for detecting anomalous events in a network |
| US8423637B2 (en) | 2010-08-06 | 2013-04-16 | Silver Spring Networks, Inc. | System, method and program for detecting anomalous events in a utility network |
| US9887893B2 (en) | 2010-08-06 | 2018-02-06 | Silver Spring Networks, Inc. | System, method and program for detecting anomalous events in a network |
| CN102565475A (en) * | 2012-01-18 | 2012-07-11 | 福建省电力有限公司三明电业局 | Electricity stealing prevention device for electric energy meter |
| ITRM20130229A1 (en) * | 2013-04-17 | 2014-10-18 | Bitron Spa | DETECTED OR MEASURED MEASUREMENT EQUIPMENT. |
| EP2793033A1 (en) | 2013-04-17 | 2014-10-22 | BITRON S.p.A. | Improved detecting or measuring apparatus |
| CN103257257A (en) * | 2013-05-03 | 2013-08-21 | 山东菲达电器有限公司 | Electricity larceny prevention low-voltage measuring cabinet |
| FR3024549A1 (en) * | 2014-07-30 | 2016-02-05 | Sagemcom Energy & Telecom Sas | COUNTER ELECTRIC COUNTER TYPE |
| EP2980591A1 (en) * | 2014-07-30 | 2016-02-03 | Sagemcom Energy & Telecom Sas | Meter such as an electric meter |
| CN105425004A (en) * | 2015-12-23 | 2016-03-23 | 深圳市金正方科技股份有限公司 | Electric energy measuring equipment and method and device for detecting electricity stealing event of same |
| WO2017182087A1 (en) * | 2016-04-21 | 2017-10-26 | Consejo Superior De Investigaciones Cientificas (Csic) | Device for detecting fraud in meters and related method |
| EP3537162A4 (en) * | 2016-11-01 | 2020-07-01 | Omron Corporation | Electricity meter and electricity meter fire outbreak location identification method |
| CN110658486A (en) * | 2019-09-27 | 2020-01-07 | 杭州海兴电力科技股份有限公司 | Antimagnetic detection device of secondary electric power metering equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2003065055A3 (en) | 2004-03-18 |
| AU2003238703A1 (en) | 2003-09-02 |
| WO2003065055B1 (en) | 2004-04-22 |
| SI21151A (en) | 2003-08-31 |
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