US20100315063A1 - Meter device and method of testing a cut neutral conductor - Google Patents
Meter device and method of testing a cut neutral conductor Download PDFInfo
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- US20100315063A1 US20100315063A1 US12/482,944 US48294409A US2010315063A1 US 20100315063 A1 US20100315063 A1 US 20100315063A1 US 48294409 A US48294409 A US 48294409A US 2010315063 A1 US2010315063 A1 US 2010315063A1
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- conductor
- meter
- gap
- coupled
- lead conductor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
-
- 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
- G01R11/04—Housings; Supporting racks; Arrangements of terminals
Definitions
- the subject matter disclosed herein relates to device for testing electrical service, and in particular to a device for electrical meters that allows the independent testing of electrical measurements made by the electrical meter.
- Electrical meters are used to provide a measurement of the amount of electrical power consumed by a customer. Electrical meters are typically installed by a utility at a customers facility adjacent the location where the electrical power line enters the building. Electrical meters typically have an interface, such as an electronic display or a set of dials for example, that allows both the customer and the utility to review the amount of electrical power measured by the meter. The electrical meters are periodically (e.g. monthly) read by the utility to determine how much the customer should be billed. The meters may be read by sending personnel to each meter to record the measurements, or the data may be transmitted electronically to the utility. It should be appreciated that it is desirable that the electrical meter accurately measure the amount of electrical power consumed.
- a meter device having a base.
- the base includes a first phase conductor and a second phase conductor extending therethrough.
- a housing is coupled to the base.
- a first stab is arranged in the housing and is electrically coupled to the first phase conductor.
- a second stab is arranged in the housing and is electrically coupled to the second phase conductor.
- a first lead conductor is electrically coupled between the first stab and the first phase conductor.
- a second lead conductor is electrically coupled between the second stab and the second phase conductor.
- a first insulation member covers the first lead conductor, the first insulation member having a first gap.
- a first cover is movably coupled to the first insulation member.
- a second cover is movably coupled to the second insulation member.
- a meter device having a housing with a wall.
- a base is coupled to the housing.
- a first phase leg conductor is coupled to the base.
- a neutral conductor is coupled to the base.
- a first lead conductor having a first and second end is electrically coupled to the first phase leg conductor, the first lead conductor having a first loop portion extending through the wall.
- a first insulation member is disposed over the first lead conductor and extends from a first end to the first loop portion.
- a second insulation member is disposed over the first lead conductor and extends from a second end to the first loop portion, wherein the first insulation member and the second insulation member define first gap therebetween.
- a first cover is movably coupled to the first lead conductor.
- a neutral terminal is coupled to the wall, the neutral terminal being electrically coupled to the neutral conductor.
- a method of checking a neutral conductor on an electrical meter having at least one phase conductor includes the step of removing the electrical meter from a meter socket.
- a meter adapter is installed having at least one lead conductor electrically coupled to the at least one phase conductor and a neutral terminal.
- the electrical meter is installed on the meter adapter.
- An induction meter is coupled to the at least one lead conductor.
- a first measurement of electrical power is measured with the induction meter.
- the neutral terminal is coupled to an external neutral.
- a second measurement of electrical power is measured with the induction meter. A deviation is determined between the first measurement and the second measurement.
- FIG. 1 is a first perspective view illustration of a meter device in accordance with an embodiment of the invention
- FIG. 2 is top plan view illustration of the meter device of FIG. 1 ;
- FIG. 3 is a first side view illustration of the meter device of FIG. 1 ;
- FIG. 4 is a bottom view illustration of the meter device of FIG. 1 ;
- FIG. 5 is a second side view illustration of the meter device of FIG. 1 ;
- FIG. 6 is a second perspective view illustration of the meter device of FIG. 1 with covers arranged in a first position;
- FIG. 7 is a perspective view illustration of the meter device of FIG. 1 installed with a load inducer
- FIG. 8 is another perspective view illustration of the meter device of FIG. 1 with an induction meter attached;
- FIG. 9 is another perspective view illustration of the meter device of FIG. 1 with an external neutral attached.
- FIG. 10 is a flow diagram illustration of a method of detecting a severed neutral conductor.
- FIGS. 1-6 An exemplary embodiment of a meter device 20 is illustrated in FIGS. 1-6 .
- the meter device 20 includes a base 22 coupled to a housing 24 .
- the base 22 includes a first pair of first phase conductors 26 , a second pair of second phase conductors 28 and a neutral conductor 30 .
- the conductors 26 , 28 , 30 extend from a bottom surface 34 .
- the base 22 and conductors 26 , 28 , 30 are generally adapted to interface with a standard electrical meter socket 32 ( FIG. 7 ), such as those used by electrical utilities on residential and commercial buildings for example.
- the housing 24 includes a first wall 36 , with a second wall 38 extending about its periphery.
- the walls 36 , 38 define an interior portion 40 .
- a plurality of standoffs 42 extends from the first wall 36 into the interior portion 40 .
- Each of the standoffs 42 includes an opening 43 to allow wires and conductors to pass through.
- the conductors 26 , 28 , 30 extend through the standoffs 42 into the interior portion 40 .
- the first phase conductors 26 are coupled to stabs 44 , 45 .
- the second phase conductors 28 are coupled to stabs 46 , 47 .
- the neutral conductor 30 is coupled to a stab 48 .
- each of the stabs 44 , 45 , 46 , 47 , 48 are adapted to interface with corresponding conductors (not shown) in an electrical meter 50 ( FIG. 7 ).
- a wire 52 electrically connects the neutral stab 48 to a neutral terminal 54 mounted on the outer surface of the second wall 38 .
- the meter device 20 also includes a first lead conductor 56 and a second lead conductor 58 .
- the first lead conductor 56 and second lead conductor 58 allow and operator to take measurements of electrical power with the electrical meter 50 installed.
- the first lead conductor 56 includes a first end 60 electrically coupled to the stab 44 .
- the first lead conductor 56 extends from the first end 60 through an opening 62 in the second wall 38 .
- the first lead conductor 56 then loops, forming a first middle portion 64 and reenters the interior portion 40 through a second opening 70 in second wall 38 .
- a second end 68 of the first lead conductor 56 passes through an opening 43 in the standoffs 42 and connects to the first phase conductor 26 in the base 22 opposite the stab 44 .
- a first insulation member 72 is disposed over the first lead conductor 56 adjacent the first end 60 .
- the first insulation member 72 ends through the opening 62 and over a portion of the middle portion 64 .
- a second insulation member 74 is disposed over the first lead conductor 56 adjacent the second end 68 .
- the first and second insulation members 72 , 74 are made from an electrically insulating material.
- the first and second insulation members 72 , 74 cooperate to define a gap 76 in the middle portion 64 .
- an electrically conductive first coil 78 is disposed in the gap 76 .
- the coil 78 may be made from a suitable electrically conductive material such as copper for example.
- a first cover member 80 is disposed about the first insulation member 72 .
- the first cover member 80 is moveable between a first position shown in FIG. 6 and a second position shown in FIG. 1 . When arranged in the second position, the first cover member 80 substantially covers the gap 76 .
- the first cover member 80 is sized to cover the gap 76 and a portion of the first and second insulation members 72 , 74 when in the second position.
- the first cover member 80 is made from an electrically insulating material, such as rubber for example.
- the second lead conductor 58 is arranged in a substantially identical manner as the first lead conductor 56 .
- the second lead conductor 58 includes a first end 82 electrically coupled to stab 46 .
- the second lead conductor 58 extends therefrom through an opening 84 in second wall 38 forming a second middle portion 86 .
- the second lead conductor 58 re-enters the interior portion 40 through an opening 88 .
- a second end 90 extends through opening 43 in one of the standoffs 42 and is connected to the first phase conductor 26 opposite the stab 46 .
- a third insulation member 92 is disposed over the second lead conductor 58 adjacent the first end 82 and a fourth insulation member 94 is disposed over the second lead conductor 58 adjacent the second end 90 .
- the third and fourth insulation members 92 , 94 cooperate to define a gap 96 in the middle portion 86 .
- a second coil 98 is disposed in the gap 96 and a second cover member 100 is movably disposed over the third insulation member 92 .
- the second cover member 100 is movable between a first position ( FIG. 6 ) and a second position ( FIG. 1 ).
- the second cover member 100 is sized to span the gap 96 and a portion of the third insulation member 92 and the fourth insulation member 94 while in the second position.
- the lead conductors 56 , 58 are electrically coupled to the first phase conductor 26 and the second phase conductor 28 and that electrical current flowing through the phase conductors 26 , 28 also flow through the respective lead conductors 56 , 58 . This provides advantages in measuring the individual phases separately. It should further be appreciated that while the embodiments described herein refer to a two-phase electrical meter, the claimed invention should not be so limited. A single-phase meter device 20 is also contemplated and would be substantially similar to that described herein however, only a single-phase conductor would be used with a single lead conductor for example.
- FIGS. 7-8 one method of operating the meter device 20 is illustrated. It is desirable to test the accuracy of the measurements made by the electrical meter 50 without entering the building or facility that the electrical meter 50 is connected. First, the electrical meter 50 is removed and the meter device 20 installed in the meter socket 32 . The electrical meter 50 is then installed on the meter device 20 . It should be appreciated that since the phase conductors 26 , 28 provide a direct electrical connection from the electrical meter 50 to the meter socket 32 , the electrical meter 50 may measure the flow of electrical current as if it were installed in the meter socket 32 .
- a load inducer 102 includes a first cable 106 coupled to the neutral terminal 54 and a second cable 108 coupled to one of the coils 78 , 98 .
- a second cable 108 coupled to one of the coils 78 , 98 .
- one of the cover members 80 , 100 is moved from the second position to the first position to expose the underlying coil 78 , 98 .
- the cover member for the electrical phase not being tested remains in the second position covering the respective coil.
- the electrical meter 50 may be electrically isolated from the building or load by placing insulators 104 ( FIG. 4 ) over the phase conductors 26 , 28 .
- the load inducer 102 simulates a known quantity of load or flow of electrical current. With the load inducer 102 installed and operating, the operator can test the meter potentials and dial rotation. This provides the advantage of allowing the operator to validate the meter readings and determine if the electrical meter 50 has been tampered with or if there is a malfunction.
- the electrical meter 50 is coupled to the customers load such that the electrical meter 50 is measuring the electrical power consumed.
- An induction meter 110 is coupled to one of the lead conductors 56 , 58 . Since the lead conductors 56 , 58 are electrically coupled to the phase conductors 26 , 28 , the induction meter 110 can measure the electrical current flowing into the connected building. By measuring for a time period, such as with a stopwatch 112 for example, the operator may determine the electrical power consumed and compare this measurement with that measured by the electrical meter 50 . Similar to the embodiment of FIG.
- the performance of the electrical meter may be validated and tampering or malfunctions determined without requiring the operator to enter the building the electrical meter 50 is connect to. It should be appreciated that the testing could be performed on each electrical phase by connecting the induction meter 110 to each lead conductor 56 , 58 sequentially.
- One other potential source of errors in the electrical meter 50 occurs when a neutral conductor has been severed or cut within the building to which the electrical meter 50 is connected.
- the method 114 starts in block 116 and proceeds to block 118 where the electrical meter 50 is removed.
- the meter device 20 is installed in block 120 and the electrical meter 50 installed on the meter device 20 in block 122 in a similar manner to that as described herein above.
- An induction meter 110 is installed on one of the lead conductors 56 , 58 in block 124 .
- the electrical current is measured with the induction meter for a time period (as measured with stop watch 112 for example) in block 130 .
- the amount of electrical power consumed may be determined from knowing the voltage, current and time.
- an external neutral conductor is connected by attaching an electrical cable 126 to the neutral terminal 54 .
- the opposite end of the electrical cable 126 is placed in electrical contact with a known ground, such as a pipe 128 for example, to create an external neutral conductor.
- Method 114 then proceeds to block 136 where the deviation between the measurements with and without the external neutral connected is determined.
- query block 138 it is determined whether the deviation or error in the measurements is beyond a threshold. If the deviation is greater than the threshold, then method 114 proceeds to block 140 where it is determined that the neutral conductor has been severed. After it has been determined that the neutral conductor was severed, or if query block 138 returns a negative (e.g. the measurements are similar), then the method 113 stops in block 142 .
- the method 114 may be repeated for each electrical phase by moving the induction meter 110 from the first lead conductor 56 to the second lead conductor 58 and repeating steps described herein.
Abstract
Description
- The subject matter disclosed herein relates to device for testing electrical service, and in particular to a device for electrical meters that allows the independent testing of electrical measurements made by the electrical meter.
- Electrical meters are used to provide a measurement of the amount of electrical power consumed by a customer. Electrical meters are typically installed by a utility at a customers facility adjacent the location where the electrical power line enters the building. Electrical meters typically have an interface, such as an electronic display or a set of dials for example, that allows both the customer and the utility to review the amount of electrical power measured by the meter. The electrical meters are periodically (e.g. monthly) read by the utility to determine how much the customer should be billed. The meters may be read by sending personnel to each meter to record the measurements, or the data may be transmitted electronically to the utility. It should be appreciated that it is desirable that the electrical meter accurately measure the amount of electrical power consumed.
- Periodically, it is desirable to test the measurements of the electrical meter to ensure that the measurements are accurate. Measurements by the meter could vary for a number of reasons, such as meter component failure, tampering or a broken or cut neutral conductor for example. To make these measurements, the utility typically needs access to the customer's circuit breaker panel. As a result, the testing needed to be scheduled when the customer was available to allow access to the facility. Often resulting in an inconvenience for the customer and the utility.
- While existing devices and methods for checking the accuracy of electrical meters are suitable for their intended purposes, improvements may be made in allowing testing of the electrical meter location without entering a customer's facility.
- According to one aspect of the invention, a meter device is provided having a base. The base includes a first phase conductor and a second phase conductor extending therethrough. A housing is coupled to the base. A first stab is arranged in the housing and is electrically coupled to the first phase conductor. A second stab is arranged in the housing and is electrically coupled to the second phase conductor. A first lead conductor is electrically coupled between the first stab and the first phase conductor. A second lead conductor is electrically coupled between the second stab and the second phase conductor. A first insulation member covers the first lead conductor, the first insulation member having a first gap. A second insulation member covering the second lead conductor, the second insulation member having a second gap. A first cover is movably coupled to the first insulation member. A second cover is movably coupled to the second insulation member.
- According to another aspect of the invention, a meter device is provided having a housing with a wall. A base is coupled to the housing. A first phase leg conductor is coupled to the base. A neutral conductor is coupled to the base. A first lead conductor having a first and second end is electrically coupled to the first phase leg conductor, the first lead conductor having a first loop portion extending through the wall. A first insulation member is disposed over the first lead conductor and extends from a first end to the first loop portion. A second insulation member is disposed over the first lead conductor and extends from a second end to the first loop portion, wherein the first insulation member and the second insulation member define first gap therebetween. A first cover is movably coupled to the first lead conductor. A neutral terminal is coupled to the wall, the neutral terminal being electrically coupled to the neutral conductor.
- According to yet another aspect of the invention, a method of checking a neutral conductor on an electrical meter having at least one phase conductor is provided. The method includes the step of removing the electrical meter from a meter socket. A meter adapter is installed having at least one lead conductor electrically coupled to the at least one phase conductor and a neutral terminal. The electrical meter is installed on the meter adapter. An induction meter is coupled to the at least one lead conductor. A first measurement of electrical power is measured with the induction meter. The neutral terminal is coupled to an external neutral. A second measurement of electrical power is measured with the induction meter. A deviation is determined between the first measurement and the second measurement.
- These and other advantages and features will become more apparent from the following description taken in conjunction with the drawings.
- The subject matter, which is regarded as the invention, is particularly pointed out and distinctly claimed in the claims at the conclusion of the specification. The foregoing and other features, and advantages of the invention are apparent from the following detailed description taken in conjunction with the accompanying drawings in which:
-
FIG. 1 is a first perspective view illustration of a meter device in accordance with an embodiment of the invention; -
FIG. 2 is top plan view illustration of the meter device ofFIG. 1 ; -
FIG. 3 is a first side view illustration of the meter device ofFIG. 1 ; -
FIG. 4 is a bottom view illustration of the meter device ofFIG. 1 ; -
FIG. 5 is a second side view illustration of the meter device ofFIG. 1 ; -
FIG. 6 is a second perspective view illustration of the meter device ofFIG. 1 with covers arranged in a first position; -
FIG. 7 is a perspective view illustration of the meter device ofFIG. 1 installed with a load inducer; -
FIG. 8 is another perspective view illustration of the meter device ofFIG. 1 with an induction meter attached; -
FIG. 9 is another perspective view illustration of the meter device ofFIG. 1 with an external neutral attached; and, -
FIG. 10 is a flow diagram illustration of a method of detecting a severed neutral conductor. - The detailed description explains embodiments of the invention, together with advantages and features, by way of example with reference to the drawings.
- An exemplary embodiment of a
meter device 20 is illustrated inFIGS. 1-6 . Themeter device 20 includes abase 22 coupled to ahousing 24. Thebase 22 includes a first pair offirst phase conductors 26, a second pair ofsecond phase conductors 28 and aneutral conductor 30. Theconductors bottom surface 34. In the exemplary embodiment, thebase 22 andconductors FIG. 7 ), such as those used by electrical utilities on residential and commercial buildings for example. - The
housing 24 includes afirst wall 36, with asecond wall 38 extending about its periphery. Thewalls interior portion 40. A plurality ofstandoffs 42 extends from thefirst wall 36 into theinterior portion 40. Each of thestandoffs 42 includes anopening 43 to allow wires and conductors to pass through. Theconductors standoffs 42 into theinterior portion 40. Thefirst phase conductors 26 are coupled tostabs second phase conductors 28 are coupled tostabs neutral conductor 30 is coupled to astab 48. In the exemplary embodiment, each of thestabs FIG. 7 ). Awire 52 electrically connects theneutral stab 48 to aneutral terminal 54 mounted on the outer surface of thesecond wall 38. - The
meter device 20 also includes afirst lead conductor 56 and asecond lead conductor 58. As will be discussed in more detail below, thefirst lead conductor 56 andsecond lead conductor 58 allow and operator to take measurements of electrical power with theelectrical meter 50 installed. Thefirst lead conductor 56 includes afirst end 60 electrically coupled to thestab 44. Thefirst lead conductor 56 extends from thefirst end 60 through anopening 62 in thesecond wall 38. Thefirst lead conductor 56 then loops, forming a firstmiddle portion 64 and reenters theinterior portion 40 through asecond opening 70 insecond wall 38. Asecond end 68 of thefirst lead conductor 56 passes through anopening 43 in thestandoffs 42 and connects to thefirst phase conductor 26 in the base 22 opposite thestab 44. Afirst insulation member 72 is disposed over thefirst lead conductor 56 adjacent thefirst end 60. Thefirst insulation member 72 ends through theopening 62 and over a portion of themiddle portion 64. Asecond insulation member 74 is disposed over thefirst lead conductor 56 adjacent thesecond end 68. The first andsecond insulation members - The first and
second insulation members gap 76 in themiddle portion 64. In one embodiment, an electrically conductivefirst coil 78 is disposed in thegap 76. Thecoil 78 may be made from a suitable electrically conductive material such as copper for example. Afirst cover member 80 is disposed about thefirst insulation member 72. Thefirst cover member 80 is moveable between a first position shown inFIG. 6 and a second position shown inFIG. 1 . When arranged in the second position, thefirst cover member 80 substantially covers thegap 76. In one embodiment, thefirst cover member 80 is sized to cover thegap 76 and a portion of the first andsecond insulation members first cover member 80 is made from an electrically insulating material, such as rubber for example. - The
second lead conductor 58 is arranged in a substantially identical manner as thefirst lead conductor 56. Thesecond lead conductor 58 includes afirst end 82 electrically coupled to stab 46. Thesecond lead conductor 58 extends therefrom through anopening 84 insecond wall 38 forming a secondmiddle portion 86. Thesecond lead conductor 58 re-enters theinterior portion 40 through anopening 88. Asecond end 90 extends through opening 43 in one of thestandoffs 42 and is connected to thefirst phase conductor 26 opposite thestab 46. Similarly athird insulation member 92 is disposed over thesecond lead conductor 58 adjacent thefirst end 82 and afourth insulation member 94 is disposed over thesecond lead conductor 58 adjacent thesecond end 90. The third andfourth insulation members gap 96 in themiddle portion 86. Asecond coil 98 is disposed in thegap 96 and asecond cover member 100 is movably disposed over thethird insulation member 92. Similar to thefirst cover member 80, thesecond cover member 100 is movable between a first position (FIG. 6 ) and a second position (FIG. 1 ). In one embodiment, thesecond cover member 100 is sized to span thegap 96 and a portion of thethird insulation member 92 and thefourth insulation member 94 while in the second position. - It should be appreciated that the
lead conductors first phase conductor 26 and thesecond phase conductor 28 and that electrical current flowing through thephase conductors respective lead conductors phase meter device 20 is also contemplated and would be substantially similar to that described herein however, only a single-phase conductor would be used with a single lead conductor for example. - Referring now to
FIGS. 7-8 , one method of operating themeter device 20 is illustrated. It is desirable to test the accuracy of the measurements made by theelectrical meter 50 without entering the building or facility that theelectrical meter 50 is connected. First, theelectrical meter 50 is removed and themeter device 20 installed in themeter socket 32. Theelectrical meter 50 is then installed on themeter device 20. It should be appreciated that since thephase conductors electrical meter 50 to themeter socket 32, theelectrical meter 50 may measure the flow of electrical current as if it were installed in themeter socket 32. - With the
meter device 20 installed, a number of tests may be performed. In the embodiment illustrated inFIG. 7 , aload inducer 102 includes afirst cable 106 coupled to theneutral terminal 54 and asecond cable 108 coupled to one of thecoils second cable 108, one of thecover members underlying coil electrical meter 50 may be electrically isolated from the building or load by placing insulators 104 (FIG. 4 ) over thephase conductors load inducer 102 simulates a known quantity of load or flow of electrical current. With theload inducer 102 installed and operating, the operator can test the meter potentials and dial rotation. This provides the advantage of allowing the operator to validate the meter readings and determine if theelectrical meter 50 has been tampered with or if there is a malfunction. - Other tests may also be performed. In the embodiment illustrated in
FIG. 8 , theelectrical meter 50 is coupled to the customers load such that theelectrical meter 50 is measuring the electrical power consumed. Aninduction meter 110 is coupled to one of thelead conductors lead conductors phase conductors induction meter 110 can measure the electrical current flowing into the connected building. By measuring for a time period, such as with astopwatch 112 for example, the operator may determine the electrical power consumed and compare this measurement with that measured by theelectrical meter 50. Similar to the embodiment ofFIG. 7 , the performance of the electrical meter may be validated and tampering or malfunctions determined without requiring the operator to enter the building theelectrical meter 50 is connect to. It should be appreciated that the testing could be performed on each electrical phase by connecting theinduction meter 110 to eachlead conductor - One other potential source of errors in the
electrical meter 50 occurs when a neutral conductor has been severed or cut within the building to which theelectrical meter 50 is connected. Referring now toFIGS. 9 - 10 , amethod 114 of detecting or validating a severed neutral conductor will be described. Themethod 114 starts inblock 116 and proceeds to block 118 where theelectrical meter 50 is removed. Themeter device 20 is installed inblock 120 and theelectrical meter 50 installed on themeter device 20 inblock 122 in a similar manner to that as described herein above. - An
induction meter 110 is installed on one of thelead conductors block 124. The electrical current is measured with the induction meter for a time period (as measured with stop watch 112 for example) inblock 130. The amount of electrical power consumed may be determined from knowing the voltage, current and time. Next, inblock 132, an external neutral conductor is connected by attaching anelectrical cable 126 to theneutral terminal 54. The opposite end of theelectrical cable 126 is placed in electrical contact with a known ground, such as apipe 128 for example, to create an external neutral conductor. - With the external neutral in place, the operator once again measures the electrical current for a period of time in
block 134.Method 114 then proceeds to block 136 where the deviation between the measurements with and without the external neutral connected is determined. Inquery block 138, it is determined whether the deviation or error in the measurements is beyond a threshold. If the deviation is greater than the threshold, thenmethod 114 proceeds to block 140 where it is determined that the neutral conductor has been severed. After it has been determined that the neutral conductor was severed, or ifquery block 138 returns a negative (e.g. the measurements are similar), then the method 113 stops inblock 142. Themethod 114 may be repeated for each electrical phase by moving theinduction meter 110 from thefirst lead conductor 56 to thesecond lead conductor 58 and repeating steps described herein. - While the invention has been described in detail in connection with only a limited number of embodiments, it should be readily understood that the invention is not limited to such disclosed embodiments. Rather, the invention can be modified to incorporate any number of variations, alterations, substitutions or equivalent arrangements not heretofore described, but which are commensurate with the spirit and scope of the invention. Additionally, while various embodiments of the invention have been described, it is to be understood that aspects of the invention may include only some of the described embodiments. Accordingly, the invention is not to be seen as limited by the foregoing description, but is only limited by the scope of the appended claims.
Claims (18)
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US12/482,944 US7852064B1 (en) | 2009-06-11 | 2009-06-11 | Meter device and method of testing a cut neutral conductor |
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US12/482,944 US7852064B1 (en) | 2009-06-11 | 2009-06-11 | Meter device and method of testing a cut neutral conductor |
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US20100315063A1 true US20100315063A1 (en) | 2010-12-16 |
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US9612270B2 (en) * | 2015-03-10 | 2017-04-04 | Cooper Technologies Company | Metering continuity tester |
US20160294188A1 (en) * | 2015-03-30 | 2016-10-06 | Sonnenbatterie Gmbh | Energy supply system and conductor loop enclosure |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4271390A (en) * | 1978-10-05 | 1981-06-02 | Canu John C | Electric watt-hour meter testing device |
US5617020A (en) * | 1995-06-07 | 1997-04-01 | Regents Of The University Of California | Microelectromechanical-based power meter |
US7274187B2 (en) * | 2002-06-27 | 2007-09-25 | Elster Electricity, Llc | Electrical-energy meter |
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JP2010510500A (en) | 2006-11-24 | 2010-04-02 | ジェミナ アセット マネージメント (6) ピーティーワイ リミテッド | Power monitoring system |
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4271390A (en) * | 1978-10-05 | 1981-06-02 | Canu John C | Electric watt-hour meter testing device |
US5617020A (en) * | 1995-06-07 | 1997-04-01 | Regents Of The University Of California | Microelectromechanical-based power meter |
US7274187B2 (en) * | 2002-06-27 | 2007-09-25 | Elster Electricity, Llc | Electrical-energy meter |
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