A single-phase electric energy meter, a three-phase metering device and a metering method

Abstract

The application discloses a single-phase electric energy meter, a three-phase metering device and a metering method. The single-phase electric energy meter can be used alone, the first end of a voltage sampling circuit of the single-phase electric energy meter is connected to a power line, a switch is used to switch the second end of the voltage sampling circuit to be connected to a zero line, the two ends of the voltage sampling circuit are connected to a live line and the zero line respectively, and voltage collection is realized. The single-phase electric energy meter can also be used together with another single-phase electric energy meter, the signal output interface of one single-phase electric energy meter is connected to the signal input interface of the other single-phase electric energy meter, the one single-phase electric energy meter is connected to a live line and the zero line, the other single-phase electric energy meter is connected to two live lines, and the voltage sampling circuit of the one single-phase electric energy meter is switched to be connected to the zero line and the voltage sampling circuit of the other single-phase electric energy meter is switched to be connected to the signal input interface through the switch, so that the other single-phase electric energy meter can obtain a zero line voltage reference, the one single-phase electric energy meter can receive the electric energy information of the other single-phase electric energy meter, and the total electric energy of three live lines can be calculated, and three-phase metering is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric energy metering, in particular to a single-phase electric energy meter, a three-phase metering device and a metering method. BACKGROUND

[0002] An electric energy meter is an instrument for measuring electric energy, also known as an electric meter, a kilowatt-hour meter, etc. It detects voltage and current through a metering circuit and displays the amount of electricity and / or the cost corresponding to the amount of electricity on a display screen. An electric energy meter includes a single-phase electric energy meter and a three-phase electric energy meter. The single-phase electric energy meter is used for active energy metering, and the three-phase electric energy meter is used for measuring the electric energy output (or load consumption) in a three-phase alternating current circuit.

[0003] Due to the large difference between the metering schemes of the single-phase electric energy meter and the three-phase electric energy meter, in the prior art, the single-phase electric energy meter and the three-phase electric energy meter are two different electric energy meters designed separately. The single-phase electric energy meter cannot be used for three-phase metering, which increases the work of electric energy meter research and development, testing, acceptance and management. SUMMARY

[0004] To solve the problem that the single-phase electric energy meter cannot be used for three-phase metering, the present application provides a single-phase electric energy meter that can be used for three-phase metering, a three-phase metering device using the single-phase electric energy meter and a metering method of the three-phase metering device.

[0005] According to an aspect of an embodiment of the present application, a single-phase electric energy meter is disclosed. The single-phase electric energy meter includes a metering module, a switch, a signal input interface, a signal output interface and a control module. The metering module is used to collect voltage information and current information and measure electric energy information. The metering module has two voltage sampling circuits. The first ends of the two voltage sampling circuits are respectively used to connect a first power supply wire and a second power supply wire, and the second ends of the two voltage sampling circuits are both connected to the switch. The switch is used to switch the second ends of the two voltage sampling circuits to be connected to the second power supply wire or to be connected to the signal input interface. The signal input interface is used to connect to the signal output interface of another single-phase electric energy meter. The signal output interface is used to connect to the signal input interface of another single-phase electric energy meter and to the second power supply wire. The control module is connected to the metering module to receive the electric energy information measured by the metering module, and the control module receives the electric energy information of another single-phase electric energy meter or sends the electric energy information to another single-phase electric energy meter.

[0006] In an exemplary embodiment, the control module receives the electric energy information of another single-phase electric energy meter through the signal input interface, or sends the electric energy information to another single-phase electric energy meter through the signal output interface.

[0007] In an example embodiment, the switch is connected to the control module, and switches the second end of the voltage sampling circuit to be connected to the second power line or the signal input interface based on a control signal of the control module.

[0008] In an example embodiment, the metering module comprises two current sampling circuits and two metering units connected to a voltage sampling circuit, a current sampling circuit and the control module respectively, the two current sampling circuits are used to collect current information of the first power line and the second power line respectively, and at least one of the metering units obtains power information of the first power line or the second power line based on information of the corresponding current sampling circuit and voltage sampling circuit.

[0009] In an example embodiment, the voltage sampling circuit comprises a first voltage dividing resistor and a second voltage dividing resistor, the first voltage dividing resistor is connected between the switch and the second voltage dividing resistor, the other end of the second voltage dividing resistor is used to connect to the first power line or the second power line, and the corresponding metering unit is connected to the junction of the first voltage dividing resistor and the second voltage dividing resistor.

[0010] In an example embodiment, the two metering units are configured to send current information to the control module, and the control module determines electricity stealing based on a difference between the current information sent by the two metering units. According to an aspect of the present application, a three-phase metering device is disclosed, which comprises two single-phase electric energy meters as described above, and a signal output interface of a first single-phase electric energy meter is connected to a signal input interface of a second single-phase electric energy meter.

[0011] In an example embodiment, the three-phase metering device further comprises a connector, and the signal input interface of the second single-phase electric energy meter is connected to the signal output interface of the first single-phase electric energy meter through the connector.

[0012] According to an aspect of the present application, a metering method of a three-phase metering device is disclosed, which comprises:

[0013] Switching the second end of the voltage sampling circuit of a first single-phase electric energy meter to be connected to a second power line, the corresponding first power line of the first single-phase electric energy meter being a live wire, and the corresponding second power line being a zero line;

[0014] Switching the second end of the voltage sampling circuit of a second single-phase electric energy meter to be connected to a signal input interface, the corresponding first power line and the corresponding second power line of the second single-phase electric energy meter both being live wires.

[0015] The control module of one of the first and the second sends power information to the control module of the other;

[0016] The control module of the other receives the power information sent by the control module of one of the first and the second, and calculates total power of the two single-phase electric energy meters.

[0017] In an exemplary embodiment, the metering method further comprises:

[0018] The control module of one of the first and the second sends current information to the control module of the other;

[0019] The control module of the other receives the current information sent by the control module of one of the first and the second, and determines electricity stealing according to the difference between the current information of the second power wire corresponding to the first and the current information of each first power wire.

[0020] The embodiments of the present application have at least the following beneficial effects:

[0021] The technical scheme provided by the present application, the single-phase electric energy meter is provided with a switching switch, a signal input interface and a signal output interface, the second end of the voltage sampling circuit is connected to the switching switch, the single-phase electric energy meter can be used for single-phase metering alone, at this time, the second end of the voltage sampling circuit is switched to the neutral wire through the switching switch, so that the two ends of one voltage sampling circuit are connected to the live wire and the neutral wire respectively, voltage collection is realized, so that single-phase metering can be realized. The single-phase electric energy meter can also be used together, the signal output interface of one single-phase electric energy meter is connected to the signal input interface of another single-phase electric energy meter, the one single-phase electric energy meter is connected to the live wire and the neutral wire, the other single-phase electric energy meter is connected to the two live wires, the second end of the voltage sampling circuit of the one single-phase electric energy meter is switched to the neutral wire through the switching switch, and the second end of the voltage sampling circuit of the other single-phase electric energy meter is switched to the signal input interface, so that the other single-phase electric energy meter can obtain the neutral wire voltage reference, and then the electric energy information of the two live wires can be metered, and the one single-phase electric energy meter meters the electric energy information of the live wire, at the same time, one single-phase electric energy meter can receive the electric energy information sent by the other single-phase electric energy meter and calculate the total electric energy of the three live wires, so that three-phase metering is realized.

[0022] It should be understood that the foregoing general description and the following detailed description are only exemplary, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings incorporated into the specification and forming a part thereof illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0024] Figure 1is a schematic diagram of a single-phase electric energy meter according to an exemplary embodiment.

[0025] Figure 2 is a schematic diagram of a single-phase electric energy meter according to another exemplary embodiment.

[0026] Figure 3 is a circuit block diagram of a single-phase electric energy meter according to an exemplary embodiment.

[0027] Figure 4 is a schematic diagram of a three-phase metering device according to an exemplary embodiment.

[0028] Figure 5 is Figure 4 is an exploded structural schematic diagram of the three-phase metering device shown.

[0029] Figure 6 is a schematic diagram of a three-phase metering device according to another exemplary embodiment.

[0030] Figure 7 is a circuit block diagram of a three-phase metering device according to an exemplary embodiment.

[0031] Reference signs are explained as follows:

[0032] single-phase electric energy meter 100; 1, meter housing; 2, switch; 3, signal input interface; 4, signal output interface; 5, control module; 61, first incoming line terminal; 62, second incoming line terminal; 63, first outgoing line terminal; 64, second outgoing line terminal; 71, first communication isolation module; 72, second communication isolation module; 81, display module; 82, indicator light; 83, key; 84, communication interface; 101, first; 102, second; connector 9. DETAILED DESCRIPTION

[0033] While the present application can be susceptible to various modifications and alternative forms, the drawings illustrated and the specification describe in detail only a few of the specific embodiments of the present application, and the intention is to be taken as an exemplification of the principles of the application and the following detailed description is not intended to limit the present application to one or more particular embodiments. If clear from the context, the singular includes the plural and singular / plural variants.

[0034] Accordingly, an element recited in the specification as a means for performing a function shall be understood as encompassing all means well known to those skilled in the art for performing the function, including one specially built to perform the function in addition to one that is monofunctional. Furthermore, to the extent that the term "including" is used in either the detailed description or the claims, such term is intended to be interpreted to be equivalent to "comprising" encompassing the recited steps or elements. Accordingly, an element recited in the specification as a means for performing a function shall be understood as encompassing all means well known to those skilled in the art for performing the function, including one specially built to perform the function in addition to one that is monofunctional. Furthermore, to the extent that the term "including" is used in either the detailed description or the claims, such term is intended to be interpreted to be equivalent to "comprising" encompassing the recited steps or elements.

[0035] In addition, the terms "first", "second", etc. are used herein only to describe different instances, and do not imply or suggest relative importance or a number of the technical features indicated. Thus, the features defined with "first", "second" can explicitly or implicitly include one or more features.

[0036] In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0037] It should be noted that in the embodiments of the present application, the words "exemplary" or "for example" or "for instance" or the like are used herein to mean "an example of" or "an example", not "preferred" or "advantageous over other embodiments". In the embodiments of the present application, any embodiment or design scheme described as "exemplary" or "for example" or "for instance" should not be interpreted as being more preferred or advantageous over other embodiments or design schemes. Rather, the use of "exemplary" or "for example" or "for instance" is intended to present the relevant concept in a specific manner.

[0038] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings. Example embodiments, may, however, be implemented in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The accompanying drawings are included to provide a conceptual understanding of the application and are provided along with the description in order to provide a thorough understanding of the application. The same reference numerals in different drawings denote the same or similar components, and repetitive description on them will be omitted.

[0039] The present application provides a single-phase electric energy meter, which can be used alone as a single-phase metering, and can also be used together as a three-phase metering. The single-phase electric energy meter of the present application will be described in detail below with some specific embodiments as examples in combination with the accompanying drawings of the present specification.

[0040] Referring to Figures 1 to 3As shown, the single-phase electric energy meter 100 of the present application comprises a meter shell 1, a metering module, a switch 2, a signal input interface 3, a signal output interface 4, and a control module 5. The metering module is configured to collect voltage information and current information and measure electric energy information, and has two voltage sampling circuits, the first ends of the two voltage sampling circuits are configured to be connected to a first power supply wire and a second power supply wire respectively, and the second ends of the two voltage sampling circuits are connected to the switch 2. The switch 2 is configured to switch the second ends of the two voltage sampling circuits to be connected to the second power supply wire, or to be connected to the signal input interface 3. The signal input interface 3 is configured to be connected to a signal output interface of another single-phase electric energy meter. The signal output interface 4 is configured to be connected to a signal input interface of another single-phase electric energy meter and to the second power supply wire. The control module 5 is connected to the metering module to receive electric energy information measured by the metering module, and the control module 5 receives electric energy information of another single-phase electric energy meter or sends electric energy information to another single-phase electric energy meter.

[0041] In one exemplary embodiment, the control module 5 receives electric energy information of another single-phase electric energy meter through the signal input interface 3, or sends electric energy information to another single-phase electric energy meter through the signal output interface 4. That is, in this one exemplary embodiment, the connection of the second power supply wire corresponding to another single-phase electric energy meter is realized through the signal input interface 3, and the interaction of electric energy information with another single-phase electric energy meter is realized through the signal input interface 3 or the signal output interface 4.

[0042] It can be understood that the control module 5 can also receive electric energy information of another single-phase electric energy meter or send electric energy information to another single-phase electric energy meter through other ways. For example, the control module 5 is integrated with a wireless communication module, such as a Bluetooth module, a 4G module, etc., to receive electric energy information of another single-phase electric energy meter or send electric energy information to another single-phase electric energy meter through a wireless communication mode.

[0043] In detail, the control module 5 can be, for example, an MCU (Microcontroller Unit) or the like.

[0044] In one exemplary embodiment, the switch 2 is connected to the control module 5, and the switch 2 switches the second ends of the two voltage sampling circuits to be connected to the second power supply wire or to be connected to the signal input interface 3 based on a control signal of the control module 5. Of course, in other embodiments, the switch 2 can also be controlled through other ways, for example, a button is arranged on the meter shell 1 to control the switch 2 through the button; for another example, a touch screen is arranged on the meter shell 1 to control the switch 2 through the touch screen.

[0045] Understandably, the first power supply wire can be either a live wire or a neutral wire; similarly, the second power supply wire can also be either a live wire or a neutral wire. When the single-phase energy meter 100 is used for single-phase metering, one of the first and second power supply wires should be a live wire, and the other should be a neutral wire. When the single-phase energy meter 100 is used for three-phase metering, both the first and second power supply wires can be live wires. In this case, for another single-phase energy meter used in conjunction with the single-phase energy meter 100, one of the corresponding first and second power supply wires should be a live wire, and the other should be a neutral wire. Of course, the first and second power supply wires cannot both be neutral wires.

[0046] The first ends of the two voltage sampling circuits are respectively connected to the first input terminal 61 and the second input terminal 62. One voltage sampling circuit is connected to the first power supply wire through the first input terminal 61, and the other voltage sampling circuit is connected to the second power supply wire through the second input terminal 62. The first input terminal 61 and the second input terminal 62 are mounted on the meter case 1. At the same time, the meter case 1 is also provided with a first output terminal 63 corresponding to the first input terminal 61 and a second output terminal 64 corresponding to the second input terminal 62. The first output terminal 63 and the second output terminal 64 are used to connect the load, respectively.

[0047] like Figure 1 , Figure 2 As shown, in Figure 1 In the illustrated embodiment, the first input terminal 61 and the second input terminal 62 are located on the same side of the watch case 1, while the first output terminal 63 and the second output terminal 64 are located on the opposite side of the watch case 1. Figure 2 In the embodiment shown, the first incoming terminal 61, the second incoming terminal 62, the first outgoing terminal 63, and the second outgoing terminal 64 are all located on the same side of the case 1.

[0048] See next. Figure 3As shown, in detail, the metering module includes two voltage sampling circuits, two current sampling circuits and two metering units. For the convenience of description, the two voltage sampling circuits are referred to as first voltage sampling circuit and second voltage sampling circuit respectively, the two current sampling circuits are referred to as first current sampling circuit and second current sampling circuit respectively, and the two metering units are referred to as first metering unit and second metering unit respectively. The control module 5 is connected to the first metering unit (metering A) and the second metering unit (metering B). The first metering unit is connected to the first voltage sampling circuit and the first current sampling circuit; the first end of the first voltage sampling circuit is connected to the first line terminal 61 to connect the first power line, and the second end of the first voltage sampling circuit is connected to the switch 2; the first current sampling circuit is connected to the first line terminal 61 and the first line terminal 63, and is used to collect the current information of the first power line. The second metering unit is connected to the second voltage sampling circuit and the second current sampling circuit; the first end of the second voltage sampling circuit is connected to the second line terminal 62 to connect the second power line, and the second end of the second voltage sampling circuit is connected to the switch 2; the second current sampling circuit is connected to the second line terminal 62 and the second line terminal 64, and is used to collect the current information of the second power line.

[0049] When the single-phase electric energy meter 100 is used for single-phase metering, the first power line is the firewire and the second power line is the zero line, the signal input interface 3 and the signal output interface 4 of the single-phase electric energy meter 100 no longer function, the switch 2 switches the second end of the first voltage sampling circuit and the second voltage sampling circuit to the zero line, at this time, the first end of the first voltage sampling circuit is connected to the firewire and the second end is connected to the zero line, the first voltage sampling circuit collects the voltage information between the firewire and the zero line, and the voltage sampling reference is the input voltage of the second line terminal 62; at the same time, the first current sampling circuit collects the current information of the firewire, the first metering unit obtains the electric energy information of the firewire based on the current information collected by the first current sampling circuit and the voltage information collected by the first voltage sampling circuit, and sends the electric energy information of the firewire to the control module 5. At the same time, the two ends of the second voltage sampling circuit are connected to the zero line, the second voltage sampling circuit no longer functions as a voltage sampling circuit, while the second current sampling circuit collects the current information of the zero line, and the second metering unit no longer functions as an electric energy information metering unit, but sends the current information of the zero line to the control module 5.

[0050] In the case that the first incoming line terminal 61, the second incoming line terminal 62, the first outgoing line terminal 63 and the second outgoing line terminal 64 of the single-phase electric energy meter 100 are correctly connected, the live line current is equal to the neutral line current. However, some users may commit electricity stealing behavior, for example, connecting the neutral line of a load directly to ground without connecting to the second outgoing line terminal 64 of the single-phase electric energy meter 100. In order to determine the electricity stealing situation, further, in an exemplary embodiment, the first metering unit and the second metering unit are configured to send current information to the control module 5, and the control module 5 determines the electricity stealing situation according to the difference between the current information sent by the first metering unit and the second metering unit.

[0051] In more detail, the first voltage sampling circuit includes a first voltage dividing resistor R3 and a second voltage dividing resistor R7, the first voltage dividing resistor R3 is connected between the switch 2 and the second voltage dividing resistor R7, the other end of the second voltage dividing resistor R7 is connected to the first incoming line terminal 61 to connect the first power line, the first metering unit is connected to the junction of the first voltage dividing resistor R3 and the second voltage dividing resistor R7, and the voltage value is obtained by obtaining the voltage division of the second voltage dividing resistor R7. It can be understood that the resistance value of the second voltage dividing resistor R7 can be set to be much smaller than the resistance value of the first voltage dividing resistor R3, so as to convert a large voltage into a small voltage for facilitating voltage measurement.

[0052] Similarly, the second voltage sampling circuit includes a first voltage dividing resistor R4 and a second voltage dividing resistor R8, the first voltage dividing resistor R4 is connected between the switch 2 and the second voltage dividing resistor R8, the other end of the second voltage dividing resistor R8 is connected to the second incoming line terminal 62 to connect the second power line, and the second metering unit is connected to the junction of the first voltage dividing resistor R4 and the second voltage dividing resistor R8. The voltage value is obtained by obtaining the voltage division of the second voltage dividing resistor R8. It can be understood that the resistance value of the second voltage dividing resistor R8 can be set to be much smaller than the resistance value of the first voltage dividing resistor R4, so as to convert a large voltage into a small voltage for facilitating voltage measurement.

[0053] In detail, the first current sampling circuit is a manganin resistor R12, and the two ends of the manganin resistor R12 are connected to the first incoming line terminal 61 and the first outgoing line terminal 63 respectively, as described above, the first incoming line terminal 61 is used to connect the first power line, and the first outgoing line terminal 63 is used to connect the load.

[0054] Similarly, the second current sampling circuit is a manganin resistor R10, and the two ends of the manganin resistor R10 are connected to the second incoming line terminal 62 and the second outgoing line terminal 64 respectively, as described above, the second incoming line terminal 62 is used to connect the second power line, and the second outgoing line terminal 64 is used to connect the load.

[0055] It can be understood that the resistance of the manganese-copper resistor R12 and the manganese-copper resistor R10 is small, for example, 150-200 micro ohms. By obtaining the voltage of the manganese-copper resistor R12 and the manganese-copper resistor R10, for example, 20 millivolts, and dividing the voltage of the manganese-copper resistor R12 by the resistance of the manganese-copper resistor R12, the current value of the first power line (fire wire) is obtained. The voltage of the manganese-copper resistor R10 is divided by the resistance of the manganese-copper resistor R10, and the current value of the second power line (zero line) is obtained.

[0056] Please refer to Figure 3 As shown in the figure, since the metering unit is measuring strong current when working, and the control module 5 can only withstand weak current, communication isolation is needed between the metering unit and the control module 5. In Figure 3 In the embodiment shown in the figure, the single-phase electric energy meter 100 further includes a first communication isolation module 71 and a second communication isolation module 72, wherein the first communication isolation module 71 is arranged between the control module 5 and the first metering unit, and the second communication isolation module 72 is arranged between the control module 5 and the second metering unit. Strong and weak current isolation is realized through the first communication isolation module 71 and the second communication isolation module 72. The specific implementation form of the first communication isolation module 71 and the second communication isolation module 72 is prior art, which will not be described here.

[0057] Please refer to Figure 1 and Figure 2 As shown in the figure, the single-phase electric energy meter 100 further includes a display module 81 for displaying electric energy and other related information. In detail, the display module 81 can be, for example, a liquid crystal display screen, and the watch case 1 is provided with a window exposing the display interface of the display module 81.

[0058] In addition, the single-phase electric energy meter 100 further includes an indicator light 82, a button 83, and a communication interface 84, wherein the indicator light 82 is used to indicate communication and electric energy pulse information, the button 83 is used to control the display of the display module 81, and the communication interface 84 is an external communication interface, so that the control module 5 can send the metered electric energy information to the upper computer. The control module 5 can send the metered electric energy information to the upper computer through 485 or Ethernet communication mode. The upper computer can be an electronic device in communication connection with multiple single-phase electric energy meters, so as to collect the electric energy information metered by multiple single-phase electric energy meters through the upper computer.

[0059] Next, please refer to Figures 4 to 7As shown, the application also provides a three-phase metering device, which comprises two single-phase electric energy meters, and a signal output interface 4 of a first one 101 of the two single-phase electric energy meters is connected to a signal input interface 3 of a second one 102 of the two single-phase electric energy meters, so that the single-phase electric energy meter as the first one 101 can send electric energy information to the single-phase electric energy meter as the second one 102, and the single-phase electric energy meter as the second one 102 can receive the electric energy information of the single-phase electric energy meter as the first one 101.

[0060] As described above, the sending or receiving of the electric energy information between the two single-phase electric energy meters can be realized through wired communication, for example, the signal input interface 3 of the second one 102 is connected to the signal output interface 4 of the first one 101 through a connector, at this time, the signal input interface 3 of the second one 102 and the signal output interface 4 of the first one 101 are used as the electric energy information transmission interface while realizing the connection of the voltage sampling circuit of the second one 102 to the zero line. The sending or receiving of the electric energy information between the two single-phase electric energy meters can also be realized through wireless communication, for example, the control module 5 is integrated with a Bluetooth module, a 4G module, etc., to realize the receiving of the electric energy information of another single-phase electric energy meter or the sending of the electric energy information to another single-phase electric energy meter.

[0061] As shown in Figure 5 As shown in Figure 5 In the embodiment shown, the two single-phase electric energy meters are connected through wired communication, and the three-phase metering device further comprises a connector 9, and the signal input interface 3 of the second one 102 of the two single-phase electric energy meters is connected to the signal output interface 4 of the first one 101 through the connector 9.

[0062] In detail, the connector 9 can be any connector that can connect the two single-phase electric energy meters, for example, the signal input interface 3 and the signal output interface 4 of the single-phase electric energy meter have a jack, and the connector 9 is a connector with multiple pins that are adapted to the jack of the signal input interface 3 and the signal output interface 4.

[0063] Of course, one of the signal input interface 3 and the signal output interface 4 of the single-phase electric energy meter can be provided with a pin, and the other one has a jack that is adapted to the pin, and the signal input interface 3 of the second one 102 is connected to the signal output interface 4 of the first one 101 through the pin and the jack, at this time, the connector can not be provided.

[0064] Wherein, for the first one 101, the voltage sampling circuit is composed of the voltage dividing resistor R3 and the voltage dividing resistor R7, the voltage sampling circuit is composed of the voltage dividing resistor R4 and the voltage dividing resistor R8, the manganese copper resistor R12 is used as a current sampling circuit, and the manganese copper resistor R10 is used as another current sampling circuit. For the second one 102, the voltage sampling circuit is composed of the voltage dividing resistor R1 and the voltage dividing resistor R5, the voltage sampling circuit is composed of the voltage dividing resistor R2 and the voltage dividing resistor R6, the manganese copper resistor R11 is used as a current sampling circuit, and the manganese copper resistor R9 is used as another current sampling circuit.

[0065] In addition, the application also provides a metering method of the three-phase metering device, which comprises:

[0066] The switch 2 of the first one 101 of the two single-phase electric energy meters is switched to connect the second end of the voltage sampling circuit to the second power line (the second incoming line terminal 62), and the first power line corresponding to the first one 101 is the live wire, and the second power line is the zero line;

[0067] The switch 2 of the second one 102 of the two single-phase electric energy meters is switched to connect the second end of the voltage sampling circuit to the signal input interface 3, and the first power line and the second power line corresponding to the second one 102 are both live wires;

[0068] The control module 5 of the first one 101 is configured to send the electric energy information to the control module 5 of the second one 102;

[0069] The control module 5 of the second one 102 is configured to receive the electric energy information sent by the control module 5 of the first one 101, and calculate the total electric energy metered by the two single-phase electric energy meters.

[0070] At this time, the voltage sampling reference of the first one 101 of the two single-phase electric energy meters is the input voltage of the second incoming line terminal 62, the signal output interface 4 of the first one 101 is enabled, the signal input interface 3 of the second one 102 of the two single-phase electric energy meters communicates with the signal output interface 4 of the first one 101, the electric energy information of the first one 101 is sent to the control module 5 of the second one 102, the voltage sampling reference of the second one 102 is also the input voltage of the second incoming line terminal 62 of the first one 101, the signal input interface 3 of the second one 102 is enabled, the input voltage of the second incoming line terminal 62 of the first one 101 is input through the signal output interface 4 of the first one 101, and then through the signal input interface 3 of the second one 102, so that the voltage sampling circuit of the second one 102 is connected to the second incoming line terminal 62 of the first one 101, so as to realize voltage acquisition.

[0071] In the above embodiment, the second 102 is taken as the host, and the total electric energy is calculated by the control module 5 of the second 102. At this time, the first 101 transmits the measured electric energy information to the second 102 through the signal output interface 4. It can be understood that in other embodiments, the first 101 can also be taken as the host, and the total electric energy is calculated by the control module 5 of the first 101. At this time, the second 102 transmits the measured electric energy information to the first 101 through the signal output interface 4.

[0072] That is, the electric energy information of one of the three live lines is measured by the first 101 of the two single-phase electric energy meters, the electric energy information of the other two live lines is measured by the second 102 of the two single-phase electric energy meters, and the total electric energy information of the three live lines is measured by the second 102, so that three-phase measurement is realized.

[0073] Further, in an exemplary embodiment, the metering method further comprises:

[0074] The control module 5 of the first 101 is configured to send the current information of the second power supply line to the control module 5 of the second 102;

[0075] The control module 5 of the second 102 is configured to receive the current information sent by the control module 5 of the first 101, and determine the electricity stealing situation according to the difference between the current information of the second power supply line (zero line current information) sent by the control module 5 of the first 101 and each live line current information.

[0076] In detail, the current information sent by the control module 5 of the first 101 can include zero line current information and live line current information, the current information sent by the metering module of the second 102 includes two live line current information, and the control module 5 of the second 102 determines the difference between each live line current information and the zero line current information. If the difference reaches a preset difference threshold, it is considered that there is a risk of electricity stealing. At this time, the control module 5 of the second 102 can further perform the operation of sending the judgment result of the risk of electricity stealing to the upper computer and alarming.

[0077] In the above embodiment, the second 102 is taken as the host, and the total electric energy is calculated by the control module 5 of the second 102. At this time, the first 101 transmits the measured electric energy information to the second 102 through the signal output interface 4. It can be understood that in other embodiments, the first 101 can also be taken as the host, and the total electric energy is calculated by the control module 5 of the first 101. At this time, the second 102 transmits the measured electric energy information to the first 101 through the signal output interface 4.

[0078] It is to be understood that the application is not limited to the precise construction already described above and shown in the drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is limited only by the claims that follow.

Claims

1. A single phase electricity meter, characterised in that, The single-phase electric energy meter comprises: a metering module for collecting voltage information and current information and metering electric energy information, having two voltage sampling circuits, first ends of the two voltage sampling circuits being used for connecting a first power supply wire and a second power supply wire respectively, and second ends of the two voltage sampling circuits being connected to a switching switch; the switching switch for switching the second ends of the two voltage sampling circuits to be connected to the second power supply wire or switching the second ends of the two voltage sampling circuits to be connected to a signal input interface; the signal input interface for connecting a signal output interface of another single-phase electric energy meter; a signal output interface for connecting a signal input interface of another single-phase electric energy meter and connecting to the second power supply wire; a control module connected to the metering module to receive electric energy information metered by the metering module, and the control module receiving electric energy information of another single-phase electric energy meter or sending the electric energy information to another single-phase electric energy meter.

2. The single-phase electric energy meter according to claim 1, characterized in that, The control module receives electric energy information of another single-phase electric energy meter through the signal input interface or sends the electric energy information to another single-phase electric energy meter through the signal output interface.

3. The single-phase electric energy meter according to claim 1, characterized in that, The switching switch is connected to the control module, and the switching switch switches the second ends of the two voltage sampling circuits to be connected to the second power supply wire or switches the second ends of the two voltage sampling circuits to be connected to the signal input interface based on a control signal of the control module.

4. The single-phase electric energy meter according to any one of claims 1 to 3, characterized in that, The metering module comprises two current sampling circuits and two metering units connected to one voltage sampling circuit, one current sampling circuit and the control module respectively, the two current sampling circuits are used for collecting current information of the first power supply wire and the second power supply wire respectively, and at least one metering unit obtains electric energy information of the first power supply wire or the second power supply wire based on information of the corresponding current sampling circuit and voltage sampling circuit.

5. The single-phase electric energy meter according to claim 4, characterized in that, The voltage sampling circuit comprises a first voltage dividing resistor and a second voltage dividing resistor, the first voltage dividing resistor is connected between the switching switch and the second voltage dividing resistor, the other end of the second voltage dividing resistor is used for connecting the first power supply wire or the second power supply wire, and the corresponding metering unit is connected to the connection position of the first voltage dividing resistor and the second voltage dividing resistor.

6. The single-phase electric energy meter according to claim 4, characterized in that, The two metering units are configured to send current information to the control module, and the control module judges electricity stealing based on a difference value of the current information sent by the two metering units.

7. A three-phase metering device, characterized by The single-phase electric energy meter comprises two single-phase electric energy meters, a signal output interface of a first single-phase electric energy meter is connected to a signal input interface of a second single-phase electric energy meter.

8. The three-phase metering device of claim 7, wherein, The single-phase electric energy meter further comprises a connector, and the signal input interface of the second single-phase electric energy meter is connected to the signal output interface of the first single-phase electric energy meter through the connector.

9. A method of metering a three-phase metering device as claimed in claim 7, characterized in that, The switching switch of a first single-phase electric energy meter in two single-phase electric energy meters is switched to connect the second end of the voltage sampling circuit to the second power supply wire, the corresponding first power supply wire of the first single-phase electric energy meter is a live wire, and the corresponding second power supply wire is a zero line; the switching switch of a second single-phase electric energy meter in two single-phase electric energy meters is switched to connect the second end of the voltage sampling circuit to the signal input interface, and the corresponding first power supply wire and the corresponding second power supply wire of the second single-phase electric energy meter are both live wires. ​ The control module of one of the first and second single-phase electric energy meters sends electric energy information to the control module of the other single-phase electric energy meter; The control module of the other single-phase electric energy meter receives the electric energy information sent by the control module of one of the first and second single-phase electric energy meters, and calculates the total electric energy metered by the two single-phase electric energy meters.

10. The metrology method of claim 9, wherein, Further comprising: The control module of one of the first and second single-phase electric energy meters sends current information to the control module of the other single-phase electric energy meter; The control module of the other single-phase electric energy meter receives the current information sent by the control module of one of the first and second single-phase electric energy meters, and judges the electricity stealing situation according to the difference between the current information of the second power line corresponding to the first single-phase electric energy meter and the current information of each first power line.

Images