KR20200104508A - Clamp mounted electric power measuring apparatus - Google Patents

Abstract

The present invention relates to a clamp-mounted power measurement apparatus capable of effectively blocking electrical noise infiltrating from the outside. According to one embodiment of the present invention, the power measurement apparatus comprises: a body having an opened front surface, including a wire contact unit being provided on an upper portion of the rear surface thereof and allowing a wire to be inserted thereinto, and a pressing unit insertion groove formed on the upper surface thereof; a wire pressing member inserted into the pressing unit insertion groove, and provided with a wire fixing unit being provided on an upper portion of the rear surface thereof and allowing a wire to be inserted thereinto; a spring which is arranged on a lower side of the wire pressing member, and vertically moves the wire pressing member in accordance with the thickness of a power measurement wire inserted into the wire contact unit; a cover inserted into the front surface of the body; a sensor fixing unit provided on a lower portion of the front surface of the wire pressing member; and a shielding member which is provided on at least one of the wire pressing member and the sensor fixing unit, and blocks infiltration of electrical noise.

Description

Clamp mounted electric power measuring apparatus

The embodiment relates to a clamp-mounted power measuring apparatus having a structure capable of measuring both current and voltage and effectively blocking electrical noise penetrating from the outside.

The content described in this section merely provides background information on the embodiment and does not constitute the prior art.

In general, a smart grid (intelligent power grid) has a basic concept of building a system in which power providers and consumers exchange power usage information in real time in both directions by grafting information and communication technology to the power grid.

However, in disseminating the smart grid system, due to the cost problem that occurs when the existing distribution system is excluded and replaced with a smart grid system as a whole, and errors due to the analog data processing method of the existing current measuring devices. The activation of the smart grid system is delayed.

Currently, the method used in power measurement devices is a method of measuring the current flowing through a conductor using a current sensor and calculating the consumed power from the current sensor. Recently, a method of measuring the current flowing through a conductor using a Hall sensor has been widely used.

However, since the method of calculating the power value by converting the current value does not measure the actual voltage applied to the wire, an error may occur in the calculated power value.

In addition, electrical noise that penetrates from the outside may occur in the power measurement device and the target wire, and thus an error may occur in the calculated power value. Therefore, improvement is needed.

Accordingly, the embodiment relates to a clamp-mounted power measuring apparatus having a structure capable of measuring both current and voltage and effectively blocking electrical noise penetrating from the outside.

The technical problem to be achieved by the embodiment is not limited to the technical problem mentioned above, and other technical problems that are not mentioned will be clearly understood by those of ordinary skill in the technical field to which the embodiment belongs from the following description.

One embodiment of the power measurement device, the front is opened, the body is provided with a wire contact portion into which the wire is inserted in the upper rear, and a pressing portion insertion groove is formed on the upper surface; A wire pressing member inserted into the pressing part insertion groove and provided with a wire fixing part into which the wire is inserted in an upper rear portion; A spring disposed under the wire pressing member and moving the wire pressing member up and down according to the thickness of the power measuring wire inserted into the wire contact part; A cover inserted into the front surface of the body; A sensor fixing part provided at a lower front surface of the wire pressing member; And a shielding member provided on at least one of the wire pressing member and the sensor fixing part and shielding the penetration of electrical noise.

The shielding member includes: a first shield provided on the wire pressing member and disposed to surround the wire fixing portion; A second shield provided on the wire pressing member and disposed to surround the sensor fixing part; And a third shield disposed on one side of the sensor fixing part.

The first shield may include: a first cell disposed in a circumferential direction on a front surface of the wire pressing member and surrounding a part of a side surface of the wire fixing portion; And a second cell bent from the first cell and disposed above the wire pressing member, and surrounding an upper surface of the wire fixing part.

The second shield may include: a first part disposed in a circumferential direction on a rear surface of the wire pressing member and surrounding a part of a side surface of the sensor fixing part; And a second part bent from the first part and disposed under the wire pressing member, and surrounding an upper surface of the sensor fixing part.

The third shield may be disposed at a lower front surface of the wire pressing member to face the first part, and may surround a part of a side surface of the sensor.

The sensor may include a Hall sensor measuring a current value on the wire; A voltage measurement sensor measuring a voltage value on the wire; And a distance measurement sensor that measures a distance from the center of the wire.

The power measurement device used in the smart distribution panel of the embodiment measures the power value more precisely by using a Hall sensor that measures current, a voltage measurement sensor that measures voltage, and a distance measurement sensor that measures the thickness of the wire. Since they are installed in the form of clamps on wires installed between a plurality of loads, compared to the conventional smart distribution board, the volume can be minimized, and installation is simple, so maintenance and installation costs are reduced.

Since the power measuring device of the embodiment measures both current and voltage, it is possible to measure more precise and accurate power values than conventional power measuring devices that measure only one of current and voltage.

The shielding member of the embodiment can very effectively shield the inflow of electrical noise from the outside to the electric wire to be measured and the sensors mounted on the sensor fixing unit, thereby significantly reducing the occurrence of errors in power measurement.

1 is a schematic diagram showing the configuration of a smart distribution board according to an embodiment.
2 is a schematic diagram showing an apparatus for measuring power according to an embodiment.
3 is a side view showing a power measurement device according to an embodiment.
4 is an exploded view of FIG. 3.
5A is a cross-sectional view of FIG. 3.
5B is a perspective view showing a first shield according to an embodiment.
5C is a perspective view showing a second shield according to an embodiment.
7 is a view showing a pressing member of an embodiment.
8 is a view for explaining a combination of a pressing member and a sensor fixing unit according to an embodiment.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. Since the embodiments can be modified in various ways and have various forms, specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the embodiments to a specific type of disclosure, and should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the embodiments.

Terms such as "first" and "second" may be used to describe various elements, but the elements should not be limited by the terms. The terms are used for the purpose of distinguishing one component from another component. In addition, terms specifically defined in consideration of the configuration and operation of the embodiment are only for describing the embodiment, and do not limit the scope of the embodiment.

In the description of the embodiment, in the case of being described as being formed on "on or under" or "on or under" of each element, the upper (up) or lower (on or under) ) Includes both elements in direct contact with each other or in which one or more other elements are indirectly formed between the two elements. In addition, when expressed as “up (up)” or “on or under”, the meaning of not only an upward direction but also a downward direction based on one element may be included.

In addition, relational terms such as "top/top/top" and "bottom/bottom/bottom" used below do not necessarily require or imply any physical or logical relationship or order between such entities or elements, It may be used to distinguish one entity or element from another entity or element.

1 is a schematic diagram showing the configuration of a smart distribution board according to an embodiment. 2 is a schematic diagram showing an apparatus for measuring power according to an embodiment.

As shown in Figs. 1 and 2, the smart distribution board of the embodiment includes a plurality of sensor units 120 installed in the form of clamps on wires respectively installed between the distribution panel 100 and a plurality of loads, and an electronic watt hour meter 140. , And a computer server 160.

The sensor units 200 are connected to each other in a series manner, and are respectively installed between the distribution panel 100 and a plurality of loads, for example, lighting, outlets, air conditioners and other electric devices, and from the smart distribution panel 100 to each load. Measure the current and voltage values to calculate the amount of power supplied.

The electronic watt hour meter 140 is integrally provided with a multi-power meter 142 that displays the branch power consumption output from each sensor unit 120, and measures and displays the integrated power consumption used through the distribution panel 100, and , The branch power usage and the integrated power usage are transmitted to the computer server 160.

Meanwhile, the embodiment describes that the electronic watt hour meter 140 and the multiple power meter 142 are provided integrally, but the electronic watt hour meter 140 and the multiple power meter 142 may be configured separately.

In this case, the electronic watt hour meter 140 may be a product that is generally used, and the multi-power meter 142 is connected to the sensor units 120 in a series manner and is a branch output from each sensor unit 120 The power usage is measured and transmitted to the computer server 160.

The computer server 160 monitors the integrated power usage and branch power usage transmitted by being connected to the electronic power meter 140, stores the power usage in a database (DB) not shown, and stores other communication devices connected via a wired or wireless network. For example, the power usage information may be provided to a power provider or power consumer's smartphone, tablet PC, laptop, etc.

The sensor unit 120 is a power measurement device including a Hall sensor 122, a voltage measurement sensor 123, a distance measurement sensor 124, a control unit 126, and a power communication unit 128. Hereinafter, the terms of the sensor unit 120 and the power measuring device may be used interchangeably and refer to the same components.

The power measurement device of the embodiment measures the current value of each load through the Hall sensor 122, measures the voltage value of each load through the voltage measurement sensor 123, and measures the power value from the measured current value and voltage value. Yields

The Hall sensor (Hall Effect Current Sensor) 122 measures the current value on the wire, and the voltage measurement sensor 123 measures the voltage value on the wire by measuring the distribution and strength of the electric field formed around the wire. , The distance measuring sensor (Photo Sensor Potentiometer, 124) measures the distance from the center of the wire.

As shown in FIGS. 4 and 8, the Hall sensor 122 and the voltage measurement sensor 123 may be provided on a sensor fixing unit such that an arrangement area is separated from each other on the same plane and electrically insulated from each other.

The control unit 126 converts the measured current value and voltage value into a digital signal through an ADC (Analog to Digital Convertor), and the current value and voltage value converted into a digital signal through a measurement correction algorithm to which the measured distance value is applied. And calculate the power value from these values.

The power communication unit 128 supplies power to the sensors 122, 123 and 124, and transmits the power value calculated by the control unit 126 to the multiple power meter 142 of the electronic watt hour meter.

The power measuring device, that is, the sensor unit 120, is installed in the form of a clamp that can be attached and detached on the wires respectively installed between the distribution board 100 and a plurality of loads, and can be used by being fixed to the position of the measuring wire, for example Up to 60 sensor units 120 are connected in series so that communication between the sensor units 120 is possible.

3 is a side view showing a power measurement device according to an embodiment. 4 is an exploded view of FIG. 3. 5A is a cross-sectional view of FIG. 3. 5B is a perspective view showing the first shield 510 according to an embodiment. 5C is a perspective view showing a second shield 520 according to an embodiment. 7 is a view showing a pressing member of an embodiment. 8 is a view for explaining a combination of a pressing member and a sensor fixing unit according to an embodiment.

As shown in FIGS. 3 to 8, the power measuring device of the embodiment has a front open as the sensor unit 120, and a “C”-shaped wire contact part 12 in which a wire is inserted and fixed at the upper rear side. It may include a body 10 in which the pressing portion insertion groove 14 is formed on the upper surface.

In addition, the power measuring device is inserted into the pressing part insertion groove 14 of the body 10, and a sensor fixing part 22 for fixing the sensor at the lower front side is provided, and a wire is inserted and fixed at the upper rear side. "It may include a wire pressing member 20 provided with a shape-shaped wire fixing portion 26.

In addition, the power measuring device is disposed under the wire pressing member 20 inserted into the body 10, and according to the thickness of the power measuring wire inserted into the wire contact portion 12, the wire pressing member 20 It may include a spring 30 to move up and down, and a cover 40 inserted and fixed to the front of the body 10.

The spring 30 is disposed between the body 10 and the wire pressing member 20 inserted into the body 10, as shown in FIGS. 4 and 5A, to press the wire pressing member 20 When the spring 30 is contracted, and when the pressure on the wire pressing member 20 is released, the spring 30 is expanded and fixed to the target wire for measuring power.

A spring fixing groove 28 is provided on the lower surface of the wire pressing member 20 as shown in FIG. 5A, and a through hole 29 for measuring the distance of the distance measuring sensor 124 is provided in the center thereof. , A spring fixing guide 15 corresponding to the spring fixing groove 28 is protruded on the bottom surface of the body 10.

In the body 10, as shown in FIG. 6, a fixing groove 16 that prevents inclination when the wire pressing member 20 is inserted is located on the circumferential surface of the pressing part insertion groove 14. It is provided, and the front of the wire pressing member 20 is provided with a protrusion 24 inserted into the fixing groove 16 of the body.

As shown in FIG. 6, a data communication connector connection groove 18 is provided on the front upper and lower surfaces of the opened body 10, and a position corresponding to the connector connection groove 18 is provided on the cover 40 In the connector connection portion 44 is formed to protrude from the top to the bottom.

As shown in FIG. 6, the body 10 has coupling grooves 13 that are coupled and fixed to each other when the cover 40 is coupled to each other, and the cover 40 has the coupling grooves ( The coupling protrusion 46 is provided at a position corresponding to 13).

The sensor fixing part 22 is provided with a cable passage 23 through which a cable for supplying power and data communication to the sensor is inserted for sensor operation, as shown in FIG. 8.

As described above, the power measurement device used in the smart distribution panel of the embodiment includes a Hall sensor 122 that measures current, a voltage measurement sensor 123 that measures voltage, and a distance measurement sensor 124 that measures the thickness of a wire. It is to measure the power value more precisely by using it.Since it is installed in the form of clamps on live wires (wires) installed between the distribution panel and a plurality of loads, the volume can be minimized compared to the conventional smart distribution panel, and the installation is simple and maintained. Maintenance and installation costs are reduced.

In addition, since the power measuring device of the embodiment measures both current and voltage, it is possible to measure more precise and accurate power values than the conventional power measuring device that measures only any one of current and voltage.

Hereinafter, the shielding member 500 of the embodiment will be described in detail with reference to FIGS. 4, 5A to 5C, and 8.

The shielding member 500 is provided on at least one of the wire pressing member 20 and the sensor fixing part 22 and may shield the penetration of electrical noise. Here, the electrical noise is an electric field that may cause an error in the measurement of power flowing into the wires and sensors 122, 123, 124 from an external source other than the wire to be measured by being mounted on the wire pressing member 20 , Electromagnetic waves and other similar things.

A plurality of power measurement devices may be disposed adjacent to each other. Accordingly, any one power measuring device may receive electrical noise from another power measuring device in an adjacent location.

Since electrical noise affects the power measurement device and causes an error in the measured power value different from the actual value, in an embodiment, a shielding member 500 made of an electrically conductive material such as metal may be provided to block electrical noise.

The shielding member 500 according to the embodiment may include a first shield 510 and a second shield 520. The first shield 510 may be provided on the wire pressing member 20 and may be disposed to surround the wire fixing part 26. The second shield 520 may be provided on the wire pressing member 20 and may be disposed to surround the sensor fixing part 22.

5A and 5B, the first shield 510 serves to shield electrical noise coming from the outside with respect to the wire mounted on the wire pressing member 20, and the first cell 511 and the first It may include two cells (512). In this case, the first shield 510 may be disposed inside the wire pressing member 20.

The first cell 511 may be disposed in a circumferential direction on the front surface of the wire pressing member 20 and may be disposed to surround a part of a side surface of the wire fixing part. The first cell 511 may be formed in a cylindrical shape with an open portion so as to correspond to the shape of the wire pressing member 20 that is generally cylindrical. In this case, the open portion of the first cell 511 may be positioned to correspond to a portion overlapping the “C”-shaped wire fixing portion 26.

The second cell 512 may be bent from the first cell 511 and disposed above the wire pressing member, and may be disposed to surround an upper surface of the wire fixing part. The second cell 512 may be provided in a disk shape so as to correspond to the shape of the wire pressing member 20 that is generally cylindrical.

The first shield 510 and the wire pressure member 20 may be integrally formed. For example, the first shield 510 made of a metal material and the wire pressure member 20 made of a non-metal material are used in an insert injection method. It can also be formed integrally.

As shown in FIGS. 5A and 5C, the second shield 520 serves to shield electrical noise from the outside with respect to the sensors mounted on the sensor fixing part 22, and the first part 521 and A second part 522 may be included.

The first part 521 may be disposed in a circumferential direction on the rear surface of the wire pressing member 20 and may be provided to surround a part of the side surface of the sensor fixing part 22. The first part 521 may be formed in a cylindrical shape with an open portion so as to correspond to the shape of the wire pressing member 20 that is generally cylindrical.

In this case, the open portion of the first part 521 may be positioned to correspond to an opening (see FIGS. 4 and 8) formed in the wire pressing member 20 so that the sensor fixing part 22 is inserted.

The second part 522 may be bent from the first part 521 and disposed under the wire pressing member 20, and may be provided to surround the upper surface of the sensor fixing part 22. The second part 522 may be provided in a disk shape so as to correspond to the shape of the wire pressing member 20 that is generally cylindrical.

In addition, the first part 521 may be disposed on the wire pressing member 20 such that an upper surface of the first part 521 and one side surface of the second part 522 face a lower surface and a side surface of the sensor fixing part 22.

The second shield 520 and the wire pressing member 20 may be integrally formed. For example, a second shield 520 made of a metal material and the wire pressing member 20 made of a non-metal material are used in an insert injection method. It can also be formed integrally.

4, 5A and 8, the third shield 530 is one side of the sensor fixing part 22 in order to shield electrical noise coming from the outside with respect to the sensors mounted on the sensor fixing part 22. Can be placed on

For example, the third shield 530 may be disposed to face the first part 521 under a front surface of the wire pressing member, and may be provided to surround a part of a side surface of the sensor.

For example, the third shield 530 may be manufactured to form a part of the sensor fixing part 22. The third shield 530 is made of an electrically conductive material, and for example, the third shield 530 made of a metal material and the sensor fixing part 22 made of a non-metal material may be integrally formed using an insert injection method. .

The shielding member 500 of the embodiment can very effectively shield the inflow of electrical noise from the outside to the electric wire to be measured and the sensors mounted on the sensor fixing part 22, thereby significantly reducing the occurrence of errors in power measurement. .

Referring to FIG. 5A, in order to shield electrical noise at an open portion of the wire fixing portion 26, a shielding means other than the shielding portion may be further provided.

Such a shielding means, for example, can be easily mounted outside the power measuring device after mounting the wire to be measured to the wire fixing part 26, and is made of an electrically conductive material that can be easily removed from the power measuring device if necessary. It can be provided. More specifically, such a shielding means may be a metallic foil.

As described above with respect to the embodiment, only a few are described, but other various types of implementation are possible. The technical contents of the above-described embodiments may be combined in various forms unless they are technologies incompatible with each other, and may be implemented as a new embodiment through this.

10: body
20: wire pressure member
30: spring
40: cover
100: distribution board
120: sensor unit
140: power meter
160: server
500: shielding member
510: first shield
511: first cell
512: second cell
520: second shield
521: Part 1
522: second part
530: third shield

Claims (6)

A body having an open front surface, an electric wire contact portion into which an electric wire is inserted in an upper rear portion, and a pressing portion insertion groove formed on an upper surface thereof;
A wire pressing member inserted into the pressing part insertion groove and provided with a wire fixing part into which the wire is inserted in an upper rear portion;
A spring disposed under the wire pressing member and moving the wire pressing member up and down according to the thickness of the power measuring wire inserted into the wire contact part;
A cover inserted into the front surface of the body;
A sensor fixing part provided at a lower front surface of the wire pressing member; And
A shielding member provided in at least one of the wire pressing member and the sensor fixing part and shielding the penetration of electrical noise
Power measurement device comprising a. The method of claim 1,
The shielding member,
A first shield provided on the wire pressing member and disposed to surround the wire fixing part;
A second shield provided on the wire pressing member and disposed to surround the sensor fixing part; And
A third shield disposed on one side of the sensor fixing part
Power measurement device comprising a. The method of claim 2,
The first shield,
A first cell disposed in a circumferential direction on a front surface of the wire pressing member and surrounding a part of a side surface of the wire fixing part; And
A second cell bent from the first cell and disposed above the wire pressing member, and surrounding the upper surface of the wire fixing portion
Power measurement device comprising a. The method of claim 2,
The second shield,
A first part disposed in a circumferential direction on a rear surface of the wire pressing member and surrounding a part of a side surface of the sensor fixing part; And
A second part bent from the first part and disposed under the wire pressing member and surrounding the upper surface of the sensor fixing part
Power measurement device comprising a. The method of claim 4,
The third shield,
The power measurement device, characterized in that it is disposed to face the first part in the lower front of the wire pressing member, and surrounds a part of the side surface of the sensor. The method of claim 1,
The sensor,
A Hall sensor measuring a current value on the wire;
A voltage measurement sensor measuring a voltage value on the wire; And
Distance measurement sensor measuring the distance from the center of the wire
Power measurement device comprising a.

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