Power consumption measurement method

Abstract

To provide a method of accurately measuring the amount of power consumed by a consumer provided with a watt-hour meter using the watt-hour meter.SOLUTION: A noise filter 3 is installed in or near a watt-hour meter 1 coupled to an electric line 2 connecting a supplier supplying electricity and a consumer consuming the electricity to remove or reduce noise affecting the power consumption measurement by the watt-hour meter 1. In particular, a ferrite core 3 may be preferably installed on the electric line 2.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for accurately measuring the amount of electricity (amount of electricity used, amount of electricity consumed) used by a consumer in which an electricity meter (integrating electricity meter, wattmeter) is installed, using the electricity meter. [Background technology]

[0002] There are various types of electricity meters, including mechanical electricity meters, electronic electricity meters, and smart meters, but all of them are connected to the electric wires that connect suppliers, such as electric power companies, that supply electricity to consumers, such as homes, offices, and factories that consume electricity.

[0003] The above-mentioned watt-hour meters have the problem that they are affected by noise caused by electromagnetic waves generated by the operation of various electrical appliances, and are unable to accurately measure the amount of electricity used. In particular, watt-hour meters are often installed outdoors, and if an outdoor unit is installed nearby, there is a problem that operating a heating / cooling device causes errors in the watt-hour meter's measurements due to electromagnetic waves generated from the outdoor unit.

[0004] There are two types of noise: normal mode noise and common mode noise. First, normal mode noise is noise that travels in opposite directions on the positive and negative sides of the power supply, and is a mode in which it returns to the power supply via the load. On the other hand, common mode noise is noise that travels in the same direction on the positive and negative sides of the power supply, and is a mode in which leaked noise returns to the power supply via the ground.

[0005] In order to eliminate noise generated in the above-mentioned electricity meters, it has been proposed to use a current input device in which an input current is converted to a voltage by a shunt resistor and output, in the current input portion of the electricity meter, the current input device having a ferrite core for eliminating common mode noise contained in the input current as a fixed component in the path through which the input current flows before being converted to a voltage signal by the shunt resistor (see, for example, Patent Document 1 below).

[0006] It has also been proposed to reduce power consumption in homes and businesses by installing an electromagnetic wave absorber in a distribution board or switchboard, which is made up of a soft magnetic material that absorbs electromagnetic waves, a laminated member that shields electromagnetic waves in a higher frequency band than the soft magnetic material, and an adhesive material (see, for example, Patent Document 2 below). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2009-188320 A [Patent Document 2] JP 2018-156981 A Summary of the Invention [Problem to be solved by the invention]

[0008] However, according to the knowledge gained by the inventors of the present invention, it is not the occurrence of the above-mentioned noise that causes the amount of electricity used to increase, but rather the occurrence of the above-mentioned noise that prevents the electricity meter from accurately measuring the amount of electricity used.

[0009] Therefore, an object of the present invention is to provide a method for accurately measuring the amount of power used by a watt-hour meter. [Means for solving the problem]

[0010] The present invention has been proposed to solve the above problems, and has the following configuration. In the following, the numbers and symbols shown in the drawings attached to this application will be described together to assist in understanding the configuration of the present invention.

[0011] The method for measuring the amount of electric power used according to claim 1 is a method for accurately measuring the amount of electric power used by a consumer in which a watt-hour meter (1) is installed, using the watt-hour meter (1). the law of nature A noise filter (3) is installed in or near a watt-hour meter (1) connected to an electric wire (2) connecting a supplier that supplies electricity to a consumer that consumes the electricity, and noise that affects the measurement of the amount of electricity used by the watt-hour meter (1) is removed or reduced. This is a method for measuring the amount of electric power used, characterized in that when there are multiple electric wires (2), a noise filter (3) is installed collectively for the multiple electric wires. .

[0012] The method for measuring the amount of electricity used according to claim 2 is a method for accurately measuring the amount of electricity used by a consumer in which an electricity meter (1) is installed, by using the electricity meter (1). A noise filter (3) is installed in or near the electricity meter (1) connected to an electric wire (2) connecting an electricity supplier and a consumer who consumes the electricity, and noise that affects the measurement of the amount of electricity used by the electricity meter (1) is removed or reduced. A method for measuring the amount of electricity used, with the power meter (1) as the boundary the supplier side and The customer side The method is to install noise filters (3) on both sides.

[0013] Claim 3 The method for measuring the amount of electricity used according to claim 1 or 2 The method for measuring the amount of electric power used is described in any one of the above, in which a ferrite core (3) is used as the noise filter (3).

[0014] Claim 4 The method for measuring the amount of electricity used according to the present invention is as follows: 3 This is a method for measuring the amount of electric power used, in which a split type ferrite core (3) is used as the ferrite core (3). Effect of the Invention

[0015] Since the method for measuring the amount of electric power usage according to the present invention is configured as described above, it can achieve the following effects.

[0016] As described above, according to the knowledge obtained by the inventor of the present invention, while noise caused by electromagnetic waves and the like prevents the watthour meter from accurately measuring the amount of power used, the method for measuring the amount of power used described in claim 1 can remove or reduce the noise that affects the measurement of the amount of power used by the watthour meter (1) by installing a noise filter (3) on or near the watthour meter (1). Therefore, the method for measuring the amount of power used described in claim 1 can solve the problem that the present invention aims to solve, which is to provide a method for accurately measuring the amount of power used by the watthour meter.

[0017] Since the noise that affects the watt-hour meter (1) often travels through the electric wire (2), 1 As in the method for measuring the amount of electric power used described above, by installing a noise filter (3) on the electric wire (2), it is possible to effectively remove or reduce noise that affects the measurement of the amount of electric power used by the watt-hour meter (1).

[0018] In addition, according to the knowledge of the inventor of the present invention, when there are a plurality of electric wires (2), 1 As in the method of measuring the amount of electric power used described above, by installing noise filters (3) individually for the multiple electric wires (2), it is possible to effectively remove or reduce normal mode noise in particular.

[0019] In addition, according to the knowledge of the inventor of the present invention, when there are a plurality of electric wires (2), 1 As in the method for measuring the amount of electric power used described above, by collectively installing a noise filter (3) for the plurality of electric wires (2), it is possible to effectively remove or reduce, in particular, common mode noise.

[0020] Here, even if a noise filter (3) is installed only on one side of the watt-hour meter (1), that is, on the supplier side that supplies electricity or on the consumer side that consumes the electricity, the noise generated in the watt-hour meter (1) can be removed or reduced to a certain extent. 2As described in the method of measuring the amount of power used, it has been found that installing noise filters (3) on both ends can ensure the elimination or reduction of noise.

[0021] Generally, various known components such as coils, capacitors, and ferrite cores are used as noise filters (3). From the viewpoint of ease of attachment to electric wires, 3 or 4 As in the method for measuring the amount of electric power used described above, it is preferable to use a ferrite core, particularly a split type ferrite core. [Brief description of the drawings]

[0022] [Figure 1] 1 is a schematic diagram showing an embodiment of a method for measuring the amount of power consumption according to the present invention; [Diagram 2] 1 is a schematic diagram showing an embodiment of a method for measuring the amount of power consumption according to the present invention; [Diagram 3] FIG. 2 is a partially enlarged explanatory view of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for measuring the amount of power usage according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0024] There are various types of watt-hour meters, such as mechanical watt-hour meters, electronic watt-hour meters, and smart meters, but in any case, they are connected to an electric wire (2) that connects a supplier such as an electric power company that supplies electricity to consumers such as homes, offices, and factories that consume electricity, as shown in Figures 1 and 2. The method for measuring the amount of electricity used according to the present invention can be implemented regardless of the type of watt-hour meter as described above.

[0025] The method for measuring the amount of electricity used according to the present invention is a method for accurately measuring the amount of electricity used by a consumer in which an electricity meter (1) is installed, using the electricity meter. As shown in Figures 1 and 2, a noise filter (3) is installed in or near the electricity meter (1) connected to an electric wire (2) connecting an electricity supplier to a consumer who consumes the electricity, and the method removes or reduces noise that affects the measurement of the amount of electricity used by the electricity meter (1).

[0026] According to the knowledge gained by the inventors of the present invention, the electricity meter (1) is affected by noise due to electromagnetic waves etc. generated by the operation of various electrical appliances, which prevents the electricity meter (1) from accurately measuring the amount of electricity used. According to the method of measuring the amount of electricity used of the present invention, by installing a noise filter (3) on or near the electricity meter (1), it is possible to remove or reduce the noise that affects the measurement of the amount of electricity used by the electricity meter (1).

[0027] Since noise that affects the watt-hour meter (1) often travels through the electric wires (2), as shown in Fig. 1, by installing a noise filter (3) on the electric wires (2), it is possible to effectively remove or reduce the noise that affects the measurement of the amount of electricity used by the watt-hour meter (1). In addition, in this case, it is preferable to install the noise filter (3) as close to the watt-hour meter (1) as possible. That is, even if the noise filter (3) is installed in a location far from the watt-hour meter (1), noise will enter the electric wires (2) between the noise filter (3) and the watt-hour meter (1) and be transmitted to the watt-hour meter (1), thereby affecting it.

[0028] According to the findings of the inventor of the present invention, when there are multiple electric wires (2) as shown in Fig. 1, it is possible to effectively remove or reduce, particularly normal mode noise, by individually installing noise filters (3) for the multiple electric wires (2). Specifically, in the case of a single-phase three-wire power distribution system, which is currently mainstream in ordinary households, the electric wire (2) consists of two voltage wires (2a) on both sides and one neutral wire (2b) sandwiched between them, and a noise filter (3) is installed individually for the three electric wires. Of course, in the case of a single-phase two-wire power distribution system, the electric wire consists of one voltage wire and one neutral wire, and a noise filter is installed individually for the two electric wires.

[0029] In addition, according to the findings of the inventors of the present invention, when there are multiple electric wires (2) as shown in Fig. 2, it is possible to effectively remove or reduce especially common mode noise by collectively installing a noise filter (3) for the multiple electric wires (2). Specifically, in the case of a single-phase three-wire power distribution system, the electric wires (2) are composed of two voltage wires (2a) and one neutral wire (2b) as described above, and a noise filter (3) is collectively installed for the three electric wires. Of course, in the case of a single-phase two-wire power distribution system, the electric wires are composed of one voltage wire and one neutral wire, and a noise filter is collectively installed for the two electric wires.

[0030] Of course, as shown in Figures 1 and 2, when there are multiple electric wires (2), the noise filters (3) may be installed individually for the multiple electric wires (2) and also the noise filter (3) may be installed collectively for the multiple electric wires (2). In this way, both normal mode noise and common mode noise can be effectively removed or reduced, which is preferable.

[0031] According to the knowledge of the inventors of the present invention, it is possible to remove or reduce noise generated in the watt-hour meter (1) to some extent by installing a noise filter (3) only on one of the sides, the supplier side that supplies electricity and the consumer side that consumes the electricity, with the watt-hour meter (1) as the boundary, but it has been found that installing a noise filter (3) on both sides can remove or reduce noise more reliably as shown in Figures 1 and 2. Also, the more noise filters (3) installed, the more reliably the noise generated in the watt-hour meter (1) can be removed or reduced more. In Figure 1, one noise filter (3) is installed on both the supplier side and the consumer side with the watt-hour meter (1) as the boundary for each of the three electric wires (2), and in Figure 2, four noise filters (3) are installed on both the supplier side and the consumer side with the watt-hour meter (1) as the boundary, but the number is not particularly limited.

[0032] Generally, various known components such as coils, capacitors, and ferrite cores are used as noise filters. From the viewpoint of ease of attachment to an electric wire (2), it is preferable to use a ferrite core (3) as the noise filter (3) used in the method for measuring electric power consumption according to the present invention, as shown in FIGS. 1 and 2.

[0033] Ferrite cores are available in various shapes, but by using a ring-shaped ferrite core with an inner diameter that fits tightly against the electric wire, the generation of magnetic flux can be suppressed and noise can be more reliably removed or reduced. However, it is difficult to attach such a ferrite core to the electric wire. Therefore, by using a split ferrite core (3) as shown in Figure 3, it is easy to attach it to the electric wire (2). Also, if a gap occurs between the electric wire (2) and the ferrite core (3), the electric wire (2) can be wound around the ferrite core (3) to bring them into close contact.

[0034] When the inventors of the present invention compared the values ​​indicated by the electricity meter as the amount of electricity used in the same facility during the same season, they found that there was a significant difference in the measurement results of the amount of electricity used before and after implementing the method for measuring the amount of electricity used in accordance with the present invention, as shown in Table 1 below.

[0035] [Table 1] [Explanation of symbols]

[0036] 1 Energy meter 2 electric wire 2a Voltage line 2b Neutral wire 3 Noise filter (ferrite core)

Claims

1. A method for accurately measuring the amount of electricity used by a consumer in which a watt-hour meter is installed, comprising the steps of: installing a noise filter in or near the watt-hour meter, which is connected to an electric wire connecting a supplier that supplies electricity to a consumer that consumes the electricity; and removing or reducing noise that affects the measurement of the amount of electricity used by the watt-hour meter.

2. 2. The method for measuring the amount of electric power used according to claim 1, further comprising the step of installing a noise filter on said electric wire.

3. 3. The method for measuring the amount of electric power used according to claim 2, wherein, when there are a plurality of electric wires, the noise filters are individually installed for the plurality of electric wires.

4. 3. The method for measuring an amount of electric power usage according to claim 2, wherein, when there are a plurality of electric wires, the noise filter is collectively installed for the plurality of electric wires.

5. 2. The method for measuring the amount of electric power used according to claim 1, characterized in that the noise filter is installed on both the supplier side that supplies electricity and the consumer side that consumes the electricity, with the electricity meter as the boundary between them.

6. 6. The method for measuring an amount of electric power consumption according to claim 1, wherein a ferrite core is used as the noise filter.

7. 7. The method for measuring an amount of electric power consumption according to claim 6, wherein a split type ferrite core is used as the ferrite core.

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