Used power consumption measuring method

Abstract

Provided is a method for accurately measuring, in an electricity meter, an amount of electricity used by a user provided with the electricity meter. The method for measuring the amount of used electricity is characterized in that a noise filter (3) is arranged on or near an electricity meter (1) connected to electric wires (2) connecting a supplier supplying power and a user consuming the power, noise which affects the measurement of the amount of used electricity by the electricity meter (1) is removed or reduced, and when there are a plurality of electric wires (2), the electric wires (2) are connected to the electricity meter (1), and the electric wires (2) are connected to the electricity meter (1). The noise filter (3) is provided together with the plurality of electric wires (2). Preferably, the noise filter is provided on both the supplier side and the user side with the electricity meter (1) as a boundary, and a ferrite core (3) is provided on the electric wire (2).

Description

Technical Field

[0001] This application relates to a method for accurately measuring the electricity used (electricity used / electricity consumed) of a user who has installed an electricity meter (cumulative meter / wattmeter). Background Technology

[0002] Electricity meters include various types such as mechanical meters, electronic meters, and smart meters, but regardless of the type, they are all connected to the power lines that connect the power suppliers, such as power companies, to the users, such as households, offices, and factories that consume electricity.

[0003] Such electricity meters are susceptible to noise from electromagnetic waves generated by the operation of various electrical products, making it impossible to accurately measure electricity consumption. In particular, since most electricity meters are installed outdoors, if an outdoor unit is located nearby, the electromagnetic waves generated by the heating and cooling system can cause measurement errors.

[0004] Here, the noise mentioned above includes two types: constant-mode noise and common-mode noise. First, constant-mode noise refers to noise that travels in opposite directions on the positive and negative sides of the power supply, and returns to the power supply via the load. In contrast, common-mode noise refers to noise that travels in the same direction on both the positive and negative sides of the power supply, and returns to the power supply via the ground.

[0005] Therefore, in order to remove the noise generated in the meter as described above, it is proposed to use the following current input device for the current input part of the meter, that is, in a current input device that converts the input current into voltage and outputs it through a shunt resistor, a ferrite core for removing common-mode noise contained in the input current is provided in the fixed part of the path through which the input current flows before being converted into a voltage signal by the shunt resistor (for example, see Patent Document 1 below).

[0006] In addition, it has been proposed to suppress power consumption in residential and commercial premises by placing a soft magnetic body that absorbs electromagnetic waves, a stacked component that shields electromagnetic waves with a higher frequency band than the soft magnetic body, and an electromagnetic wave absorber with adhesive material on a distribution panel or sub-distribution panel (for example, see Patent Document 2 below).

[0007] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2009-188320 Patent Document 2: Japanese Patent Application Publication No. 2018-156981 Summary of the Invention The technical problem that the invention aims to solve However, according to the inventors of this application, it is not the noise mentioned above that causes the increased electricity consumption, but rather that the noise mentioned above hinders the meter from accurately measuring the electricity consumption.

[0008] Therefore, the technical problem to be solved by this application is to provide a method that can accurately measure the amount of electricity used by an electricity meter.

[0009] Means for solving technical problems This application is proposed to solve the aforementioned technical problems and has the following structure. Hereinafter, to aid in understanding the structure of this application, reference numerals and figure marks are included in the accompanying drawings.

[0010] The method for measuring the electricity usage of technical solution 1 is a method for accurately measuring the electricity used by a user who has installed an electricity meter (1) in an electricity meter (1). A noise filter (3) is installed at or near the electricity meter (1) connected to the power supply (2) that connects the power supplier and the user who consumes the power, to remove or reduce noise that affects the measurement of electricity usage of the electricity meter (1). The method for measuring electricity usage is characterized in that, when there are multiple power lines (2), noise filters (3) are installed on all of the power lines together.

[0011] The method for measuring the electricity usage of technical solution 2 is a method for accurately measuring the electricity used by a user who has installed an electricity meter (1) in an electricity meter (1). It is a method for removing or reducing noise that affects the measurement of electricity usage by installing a noise filter (3) on or near the electricity meter (1) connected to the power supply provider and the user who consumes the power. The method is a method of installing a noise filter (3) on both the supplier side and the user side with the electricity meter (1) as the boundary.

[0012] The method for measuring the power consumption of technical solution 3 is the same as the method for measuring the power consumption described in either technical solution 1 or 2, which is to use a ferrite core (3) as a noise filter (3).

[0013] The method for measuring the amount of electricity used in technical solution 4 is the same as the method for measuring the amount of electricity used in technical solution 3, which is to use a segmented ferrite core (3) as the ferrite core (3).

[0014] Invention Effects The method for measuring the amount of electricity used in this application, being configured as described above, can achieve the following effects.

[0015] As described above, based on the insights gained by the inventors of this application, noise generated by electromagnetic waves and the like hinders the accurate measurement of electricity consumption by an electricity meter. However, the electricity consumption measurement method described in technical solution 1 removes or reduces noise that affects the measurement of electricity consumption by the electricity meter (1) by placing a noise filter (3) at or near the electricity meter (1). Therefore, the electricity consumption measurement method described in technical solution 1 solves the technical problem that this application seeks to solve: providing a method for accurately measuring electricity consumption by an electricity meter.

[0016] Since most of the noise affecting the meter (1) is transmitted to the wire (2), as described in the method for measuring the amount of electricity used in technical solution 1, by setting a noise filter (3) in the wire (2), the noise affecting the measurement of the amount of electricity used in the meter (1) can be effectively removed or reduced.

[0017] Furthermore, based on the insights gained by the inventors of this application, when there are multiple wires (2), as described in the method for measuring the amount of electricity used in technical solution 1, noise filters (3) can be provided for each of the multiple wires (2) to effectively remove or reduce normal noise.

[0018] Furthermore, based on the insights gained by the inventors of this application, when there are multiple wires (2), as described in the method for measuring the amount of electricity used in technical solution 1, by providing a noise filter (3) to all of the multiple wires (2), common-mode noise can be effectively removed or reduced.

[0019] Here, we gain the following insight: even if a noise filter (3) is installed only on the side of the electricity supplier and the side of the user consuming the electricity, with the electricity meter (1) as the boundary, the noise generated in the electricity meter (1) can be removed or reduced to some extent. However, as described in the method for measuring the electricity consumption in technical solution 2, installing a noise filter (3) on both sides can remove or reduce the noise more reliably.

[0020] Generally speaking, various known components such as coils, capacitors, and ferrite cores are used as components for noise filters (3). However, from the point of view of easy installation to wires, as described in the power measurement method of technical solution 3 or 4, ferrite cores, especially split ferrite cores, are preferred. Attached Figure Description

[0021] Figure 1 This is a schematic diagram illustrating one embodiment of the method for measuring the amount of electricity used, as described in this application.

[0022] Figure 2This is a schematic diagram illustrating one embodiment of the method for measuring the amount of electricity used, as described in this application.

[0023] Figure 3 yes Figure 1 A magnified illustration of a portion of the image. Detailed Implementation

[0024] Hereinafter, a method for measuring the amount of electricity used according to an embodiment of this application will be described based on the accompanying drawings.

[0025] Electricity meters include various types such as mechanical meters, electronic meters, and smart meters, but if... Figure 1 As shown in Figure 2, both are connected to the power lines (2) that connect power suppliers such as power companies to users such as households, offices, and factories that consume electricity. Furthermore, the method for measuring electricity consumption in this application can be implemented regardless of the type of electricity meter described above.

[0026] The electricity measurement method of this application is a method for accurately measuring the electricity used by a user who has installed the electricity meter (1) in an electricity meter, such as... Figure 1 As shown in Figure 2, a method is to install a noise filter (3) on or near the electricity meter (1) connected to the power supply (2) that connects the power supplier and the power consumer, and to remove or reduce noise that affects the measurement of electricity consumption by the electricity meter (1).

[0027] According to the inventors of this application, noise caused by electromagnetic waves generated by the operation of various electrical products can prevent the meter (1) from accurately measuring the electricity used. According to the electricity measurement method of this application, by setting a noise filter (3) in or near the meter (1), the noise that affects the measurement of electricity used by the meter (1) can be removed or reduced.

[0028] Since most of the noise affecting the meter (1) is transmitted to the power line (2), therefore, Figure 1 As shown, by installing a noise filter (3) on the wire (2), noise that affects the measurement of electricity usage by the meter (1) can be effectively removed or reduced. Furthermore, it is preferable to install the noise filter (3) as close as possible to the meter (1). That is, even if the noise filter (3) is installed in a location far away from the meter (1), noise can still penetrate the wire (2) between the noise filter (3) and the meter (1) and be transmitted to the meter (1), causing an impact.

[0029] Based on the insights obtained by the inventors of this application, such as Figure 1As shown, when there are multiple wires (2), noise filters (3) can be installed on each of the multiple wires (2) to effectively remove or reduce normal noise. Specifically, in the case of a single-phase three-wire distribution system, which is currently the mainstream in general households, where the wire (2) consists of two voltage lines (2a) on both sides and a neutral line (2b) sandwiched between the two voltage lines (2a), noise filters (3) are installed on each of the three wires. Of course, in the case of a single-phase two-wire distribution system, where the wire consists of one voltage line and one neutral line, noise filters are installed on each of the two wires.

[0030] Furthermore, based on the insights obtained by the inventors of this application, such as Figure 2 As shown, when there are multiple wires (2), common-mode noise can be effectively removed or reduced by installing noise filters (3) on all of them. Specifically, in the case of a single-phase three-wire distribution system, where the wires (2) consist of two voltage lines (2a) and one neutral line (2b) as described above, noise filters (3) are installed on all three wires. Of course, in the case of a single-phase two-wire distribution system, where the wires consist of one voltage line and one neutral line, noise filters are installed on both lines.

[0031] Of course, such as Figure 1 As shown in Figure 2, when there are multiple wires (2), noise filters (3) can be installed on each of the multiple wires (2) and also installed together. This is the preferred method as it can effectively remove or reduce both normal mode noise and common mode noise.

[0032] Based on the insights gained by the inventors of this application, the following insights are obtained: even if a noise filter (3) is installed only on the side of the electricity supplier and the side of the user consuming the electricity, with the electricity meter (1) as the boundary, it is possible to remove or reduce the noise generated in the electricity meter (1) to some extent, but if Figure 1 As shown in Figure 2, installing noise filters (3) on both sides can more reliably remove or significantly reduce noise. Furthermore, the more noise filters (3) installed, the more reliably noise can be removed or reduced at the meter (1). Figure 1 In the middle, with the electricity meter (1) as the boundary, noise filters (3) are installed on both the supplier's side and the user's side of the three wires (2). Figure 2 In the middle, with the electricity meter (1) as the boundary, four noise filters (3) are set on both the supplier side and the user side, but their number is not specifically limited.

[0033] Generally, various known components such as coils, capacitors, and ferrite cores are used as noise filters. However, from the viewpoint of easy installation onto the wire (2), a noise filter (3) used in the power measurement method involved in this application is, for example... Figure 1 As shown in Figure 2, a ferrite core is preferred (3).

[0034] Here, various shapes of ferrite cores are available, but by using a toroidal ferrite core with an inner diameter that closely matches the size of the wire, the generation of magnetic flux can be suppressed, thus more reliably removing or further reducing noise. However, this type of ferrite core is difficult to install in the wire. Therefore, if using... Figure 3 The segmented ferrite core (3) shown can be easily installed on the wire (2). Furthermore, if there is a gap between the wire (2) and the ferrite core (3), the wire (2) can be wound around and tightly attached to the ferrite core (3).

[0035] As for the electricity consumption in the same facility during the same season, the inventors of this application compared the values ​​indicated by the electricity meters. Before and after implementing the electricity consumption measurement method involved in this application, as shown in Table 1 below, there were significant differences in the measurement results of electricity consumption.

[0036] [Table 1]

[0037] Explanation of reference numerals in the attached figures 1. Electricity meter 2. Wires 2a voltage line 2b Neutral line 3. Noise filter (ferrite core)

Claims

1. A method of measuring used electric power for accurately measuring used electric power of a user provided with an electric meter in the electric meter, characterized by providing a noise filter at the electric meter or in the vicinity thereof connected to an electric line connecting a supplier of supplied electric power and the user consuming the electric power, removing or reducing noise affecting measurement of used electric power in the electric meter, and providing the noise filter to the plurality of electric lines in the case where a plurality of electric lines exist.

2. A method of measuring used electric power for accurately measuring used electric power of a user provided with an electric meter in the electric meter, characterized by providing a noise filter at the electric meter or in the vicinity thereof connected to an electric line connecting a supplier of supplied electric power and the user consuming the electric power, removing or reducing noise affecting measurement of used electric power in the electric meter, and providing the noise filter to the plurality of electric lines in the case where a plurality of electric lines exist.

3. The method of measuring used electric power according to claim 1 or 2, characterized by using a ferrite core as the noise filter.

4. The method of measuring used electric power according to claim 3, characterized by using a split type ferrite core as the ferrite core. ​ ​ ​ ​

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