JP2020051951A - Single-phase three-wire electronic watt-hour meter - Google Patents

Single-phase three-wire electronic watt-hour meter Download PDF

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JP2020051951A
JP2020051951A JP2018182950A JP2018182950A JP2020051951A JP 2020051951 A JP2020051951 A JP 2020051951A JP 2018182950 A JP2018182950 A JP 2018182950A JP 2018182950 A JP2018182950 A JP 2018182950A JP 2020051951 A JP2020051951 A JP 2020051951A
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君夫 津田
Kimio Tsuda
君夫 津田
尚明 倉田
Naoaki Kurata
尚明 倉田
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Osaki Electric Co Ltd
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Abstract

To provide an electronic watt-hour meter with which it is possible to prevent the occurrence of a fault or an accident by taking an appropriate measure when an abnormal voltage is measured.SOLUTION: When, on a first voltage appearing between one voltage line terminal 1S and a neutral line terminal 2S of a terminal unit 2, or a second voltage appearing between the other voltage line terminal 3S and the neutral line terminal 2S, a voltage between two voltage lines P1, P3 is watched by a control unit 5 which is a monitoring unit, first and second circuit breakers 6a, 6b are opened by the control unit 5. Therefore, even when a 200 V of voltage between the two voltage lines P1, P3 is mistakenly applied between the voltage line terminal 1S, 3S and the neutral line terminal 2S by an incorrect connection of a single-phase three-wire power distribution line to the terminal unit 2, e.g., one of two voltage lines P1, P3 is inadvertently connected to the neutral line terminal 2S, said voltage is quickly disabled from being applied to loads 11a, 11b, 11c by the opening control of the first or second circuit breakers 6a, 6b.SELECTED DRAWING: Figure 1

Description

本発明は、単相三線式配電線が端子部に接続される単相三線式電子式電力量計に関するものである。   The present invention relates to a single-phase three-wire electronic wattmeter in which a single-phase three-wire distribution line is connected to a terminal.

従来、例えば、特許文献１に開示された電子式電力量計がある。この電子式電力量計は、電流計および開閉器を備え、契約電力を超える電流が電流計に計測された場合、開閉器を開いて需要家への電力供給を停止する。また、開閉器を開いた後に開放時間設定値を経過したときは、開閉器を自動投入する。また、自動投入した回数をカウントし、カウント値が回数制限値に到達したときは自動投入を停止して、開閉器を開放状態に維持する。   Conventionally, for example, there is an electronic watt-hour meter disclosed in Patent Document 1. This electronic wattmeter includes an ammeter and a switch, and when a current exceeding the contracted power is measured by the ammeter, the switch is opened to stop supplying power to the customer. When the opening time set value has elapsed after opening the switch, the switch is automatically turned on. Also, the number of times of automatic closing is counted, and when the count value reaches the number limit value, the automatic closing is stopped and the switch is maintained in the open state.

特許第５４９４４６２号公報Japanese Patent No. 5494462

上記従来の電子式電力量計は、契約電力を超える電流が電流計に計測された場合、開閉器を開いて需要家への電力供給を停止するが、異常な電圧が計測される場合には何ら対処をしない。   When the current exceeding the contracted power is measured by the ammeter, the conventional electronic wattmeter stops the power supply to the customer by opening the switch, but when an abnormal voltage is measured. No action is taken.

本発明は、電子式電力量計において異常な電圧が計測される場合、適切な対処を行って故障や事故が発生するのを未然に防止する電子式電力量計を提供することを目的とする。   An object of the present invention is to provide an electronic watt-hour meter that takes appropriate measures to prevent a failure or an accident from occurring when an abnormal voltage is measured by the electronic watt-hour meter. .

このために本発明は、
単相三線式配電線の２本の電圧線が接続される２つの電圧線端子および１本の中性線が接続される１つの中性線端子を有する端子部と、配電線から端子部を介して負荷へ供給される電力量を計量する計量部と、配電線および負荷間の接続を開閉して配電線から負荷への電力供給を断続する開閉器とを備える単相三線式電子式電力量計において、
一方の電圧線端子および中性線端子間の電圧を測定する第１の電圧測定部と、他方の電圧線端子および中性線端子間の電圧を測定する第２の電圧測定部と、第１の電圧測定部で測定される第１の電圧および第２の電圧測定部で測定される第２の電圧を監視する監視部と、第１の電圧または第２の電圧に２本の電圧線間の電圧が監視部によって監視されると開閉器を開く制御部とを備えることを特徴とする。 For this purpose, the present invention
A terminal portion having two voltage line terminals to which two voltage lines of a single-phase three-wire type distribution line are connected and one neutral line terminal to which one neutral line is connected, and a terminal portion from the distribution line. Single-phase three-wire electronic power, comprising: a measuring unit for measuring the amount of power supplied to a load via a switch; and a switch for opening and closing the connection between the distribution line and the load to interrupt the power supply from the distribution line to the load. In the meter,
A first voltage measuring unit for measuring a voltage between one of the voltage line terminals and the neutral terminal, a second voltage measuring unit for measuring a voltage between the other voltage line terminal and the neutral terminal, A monitoring unit that monitors the first voltage measured by the voltage measuring unit and the second voltage measured by the second voltage measuring unit; and a first voltage or a second voltage between two voltage lines. And a control unit that opens the switch when the voltage of the power supply is monitored by the monitoring unit.

本構成によれば、端子部における一方の電圧線端子および中性線端子間に現れる第１の電圧、または、他方の電圧線端子および中性線端子間に現れる第２の電圧に、２本の電圧線間の電圧が監視部によって監視されると、制御部によって開閉器が開かれる。したがって、単相三線式配電線の端子部への誤接続や、単相三線式配電線自体のトランスへの誤接続等により、端子部における電圧線端子および中性線端子間に誤って２本の電圧線間の電圧が印加されても、その電圧は開閉器の開制御によって負荷に印加されなくなる。このため、電子式電力量計において異常な電圧が計測される場合、電子式電力量計が適切な対処を行って故障や事故が発生するのを未然に防止することが可能になる。   According to this configuration, the first voltage appearing between the one voltage line terminal and the neutral terminal in the terminal portion or the second voltage appearing between the other voltage line terminal and the neutral terminal is two When the voltage between the voltage lines is monitored by the monitoring unit, the control unit opens the switch. Therefore, due to erroneous connection of the single-phase three-wire distribution line to the terminal or erroneous connection of the single-phase three-wire distribution line to the transformer, two terminals are mistakenly inserted between the voltage line terminal and the neutral line terminal in the terminal part. Is applied to the load by the switch open control. Therefore, when an abnormal voltage is measured by the electronic watt-hour meter, the electronic watt-hour meter can take appropriate measures to prevent a failure or an accident from occurring.

また、本発明は、表示部を備え、制御部が、第１の電圧または第２の電圧に２本の電圧線間の電圧が監視部によって監視されると表示部を表示させることを特徴とする。   Further, the present invention includes a display unit, wherein the control unit displays the display unit when the voltage between the two voltage lines is monitored by the monitoring unit at the first voltage or the second voltage. I do.

本構成によれば、電子式電力量計において異常な電圧が計測される場合、制御部によって表示部が表示させられることで、電子式電力量計の設置作業者等に異常な電圧の発生が認識される。このため、設置作業者等は、異常な電圧の発生を認識することで、単相三線式配電線の端子部への誤接続を速やかに正したり、単相三線式配電線自体のトランスへの誤接続を速やかに正したりする等の適切な対処を迅速に行うことが可能になる。   According to this configuration, when an abnormal voltage is measured by the electronic watt-hour meter, the display unit is displayed by the control unit, so that an abnormal voltage is generated for the installer of the electronic watt-hour meter. Be recognized. Therefore, by recognizing the occurrence of abnormal voltage, the installer or the like can quickly correct the incorrect connection of the single-phase three-wire distribution line to the terminal, It is possible to promptly take appropriate measures such as quickly correcting an erroneous connection.

本発明によれば、異常な電圧が計測される場合、適切な対処を行って故障や事故が発生するのを未然に防止することが可能な電子式電力量計を提供することが出来る。   ADVANTAGE OF THE INVENTION According to this invention, when an abnormal voltage is measured, an appropriate measure can be taken and the electronic watt-hour meter which can prevent a failure or an accident from occurring can be provided.

本発明の一実施の形態による単相三線式電子式電力量計の概略構成を示すブロック図である。1 is a block diagram illustrating a schematic configuration of a single-phase three-wire electronic wattmeter according to an embodiment of the present invention.

次に、本発明による単相三線式電子式電力量計を実施するための形態について説明する。   Next, an embodiment for implementing a single-phase three-wire electronic wattmeter according to the present invention will be described.

図１は、本発明の一実施の形態による単相三線式電子式電力量計１の概略構成を示すブロック図である。単相三線式電子式電力量計１は、端子部２、計量部３、表示部４および制御部５を備える。   FIG. 1 is a block diagram showing a schematic configuration of a single-phase three-wire electronic watt-hour meter 1 according to one embodiment of the present invention. The single-phase three-wire electronic wattmeter 1 includes a terminal unit 2, a measuring unit 3, a display unit 4, and a control unit 5.

端子部２は、単相三線式配電線の２本の電圧線Ｐ１，Ｐ３が接続される２つの電圧線端子１Ｓ，３Ｓ、および１本の中性線Ｐ２が接続される１つの中性線端子２Ｓを有する。電圧線端子１Ｓは、電力量計１の内部において、第１の開閉器６ａおよび第１の電流計７ａを介して負荷端子１Ｌに接続され、他方の電圧線端子３Ｓは、電力量計１の内部において、第２の開閉器６ｂおよび第２の電流計７ｂを介して負荷端子３Ｌに接続されている。また、中性線端子２Ｓは、電力量計１の内部において、短絡線９を介して負荷端子２Ｌに接続されている。また、電圧線端子１Ｓおよび中性線端子２Ｓ間には第１の電圧計８ａが接続され、電圧線端子３Ｓおよび中性線端子２Ｓ間には第２の電圧計８ｂが接続されている。第１の電圧計８ａは、一方の電圧線端子１Ｓおよび中性線端子２Ｓ間の電圧を測定する第１の電圧測定部、第２の電圧計８ｂは、他方の電圧線端子３Ｓおよび中性線端子２Ｓ間の電圧を測定する第２の電圧測定部を構成する。   The terminal unit 2 includes two voltage line terminals 1S and 3S to which two voltage lines P1 and P3 of a single-phase three-wire distribution line are connected, and one neutral line to which one neutral line P2 is connected. It has a terminal 2S. The voltage line terminal 1S is connected to the load terminal 1L via the first switch 6a and the first ammeter 7a inside the watt hour meter 1, and the other voltage line terminal 3S is connected to the watt hour meter 1. Inside, it is connected to the load terminal 3L via the second switch 6b and the second ammeter 7b. The neutral terminal 2S is connected to the load terminal 2L via the short-circuit line 9 inside the wattmeter 1. A first voltmeter 8a is connected between the voltage line terminal 1S and the neutral terminal 2S, and a second voltmeter 8b is connected between the voltage line terminal 3S and the neutral terminal 2S. The first voltmeter 8a measures a voltage between one voltage line terminal 1S and the neutral line terminal 2S, and the second voltmeter 8b measures the voltage between the other voltage line terminal 3S and the neutral line terminal 2S. A second voltage measuring unit that measures the voltage between the line terminals 2S is configured.

２本の電圧線Ｐ１，Ｐ３および１本の中性線Ｐ２はトランス１０に接続されており、電力量計１の電圧線端子１Ｓおよび中性線端子２Ｓ間並びに電圧線端子３Ｓおよび中性線端子２Ｓ間にはトランス１０からそれぞれ単相１００Ｖが印加され、電圧線端子１Ｓおよび電圧線端子３Ｓ間には単相２００Ｖが印加される。また、需要家では、負荷端子１Ｌおよび負荷端子２Ｌ間並びに負荷端子３Ｌおよび負荷端子２Ｌ間にそれぞれ１００Ｖ負荷１１ａおよび１１ｂが接続され、負荷端子１Ｌおよび負荷端子３Ｌ間に２００Ｖ負荷１１ｃが接続される。   Two voltage lines P1, P3 and one neutral line P2 are connected to the transformer 10, and are connected between the voltage line terminal 1S and the neutral line terminal 2S of the watt hour meter 1, and between the voltage line terminal 3S and the neutral line. A single-phase 100V is applied between the terminals 2S from the transformer 10, and a single-phase 200V is applied between the voltage line terminals 1S and the voltage line terminals 3S. In the consumer, 100V loads 11a and 11b are connected between the load terminals 1L and 2L and between the load terminals 3L and 2L, respectively, and a 200V load 11c is connected between the load terminals 1L and 3L. .

計量部３は、単相三線式配電線から端子部２を介して負荷１１ａ，１１ｂ，１１ｃへ供給される電力量を計量する。この計量には、第１，第２の電流計７ａ，７ｂで測定される各電流値、および第１，第２の電圧計８ａ，８ｂで測定される各電圧値が用いられる。表示部４は液晶表示装置から構成され、計量部３で計量された電力量を表示する。制御部５は、第１の開閉器６ａおよび第２の開閉器６ｂを制御し、単相三線式配電線および負荷１１ａ，１１ｂ，１１ｃ間の接続を開閉して、単相三線式配電線から負荷１１ａ，１１ｂ，１１ｃへの電力供給を断続する。つまり、契約電力を超える電流が第１，第２の電流計７ａ，７ｂに計測された場合、第１の開閉器６ａおよび第２の開閉器６ｂを開いて需要家への電力供給を停止する。   The measuring unit 3 measures the amount of power supplied from the single-phase three-wire type distribution line to the loads 11a, 11b, and 11c via the terminal unit 2. For this measurement, each current value measured by the first and second ammeters 7a and 7b and each voltage value measured by the first and second voltmeters 8a and 8b are used. The display unit 4 includes a liquid crystal display device, and displays the amount of power measured by the measuring unit 3. The control unit 5 controls the first switch 6a and the second switch 6b to open and close the connection between the single-phase three-wire distribution line and the loads 11a, 11b, 11c, and to switch the single-phase three-wire distribution line from the single-phase three-wire distribution line. The power supply to the loads 11a, 11b, 11c is interrupted. That is, when a current exceeding the contracted power is measured by the first and second ammeters 7a and 7b, the first switch 6a and the second switch 6b are opened to stop the power supply to the customer. .

本実施形態では、制御部５は、第１の電圧計８ａで測定される第１の電圧および第２の電圧計８ｂで測定される第２の電圧を監視する監視部を構成し、第１の電圧または第２の電圧に２本の電圧線Ｐ１，Ｐ３間の２００Ｖの電圧が監視されると、第１の開閉器６ａおよび第２の開閉器６ｂを開く制御をする。また、制御部５は、第１の電圧または第２の電圧に２本の電圧線Ｐ１，Ｐ３間の２００Ｖの電圧が監視されると、表示部４に接続異常をメッセージ等で表示させる。   In the present embodiment, the control unit 5 configures a monitoring unit that monitors the first voltage measured by the first voltmeter 8a and the second voltage measured by the second voltmeter 8b. When the voltage of 200 V between the two voltage lines P1 and P3 is monitored as the second voltage or the second voltage, control is performed to open the first switch 6a and the second switch 6b. When the 200 V voltage between the two voltage lines P1 and P3 is monitored as the first voltage or the second voltage, the control unit 5 causes the display unit 4 to display a connection abnormality by a message or the like.

このような本実施形態による単相三線式電子式電力量計１によれば、端子部２における一方の電圧線端子１Ｓおよび中性線端子２Ｓ間に現れる第１の電圧、または、他方の電圧線端子３Ｓおよび中性線端子２Ｓ間に現れる第２の電圧に、２本の電圧線Ｐ１，Ｐ３間の２００Ｖの電圧が監視部である制御部５によって監視されると、制御部５によって第１の開閉器６ａおよび第２の開閉器６ｂが開かれる。したがって、中性線端子２Ｓに２本の電圧線Ｐ１，Ｐ３のいずれかを接続してしまう、単相三線式配電線の端子部２への誤接続や、単相三線式配電線自体のトランス１０への誤接続等により、端子部２における電圧線端子１Ｓ，３Ｓおよび中性線端子２Ｓ間に誤って２本の電圧線Ｐ１，Ｐ３間の２００Ｖの電圧が印加されても、その電圧は第１の開閉器６ａおよび第２の開閉器６ｂの開制御によって速やかに負荷１１ａ，１１ｂに印加されなくなる。このため、電子式電力量計１において異常な電圧が計測される場合、電子式電力量計１が適切な対処を行って故障や事故が発生するのを未然に防止することが可能になる。   According to the single-phase three-wire electronic watt-hour meter 1 according to the present embodiment, the first voltage appearing between the one voltage line terminal 1S and the neutral line terminal 2S in the terminal portion 2, or the other voltage. When the voltage of 200 V between the two voltage lines P1 and P3 is monitored by the control unit 5 serving as the monitoring unit, the control unit 5 sets the second voltage appearing between the line terminal 3S and the neutral terminal 2S. The first switch 6a and the second switch 6b are opened. Therefore, either one of the two voltage lines P1 and P3 is connected to the neutral terminal 2S, the erroneous connection of the single-phase three-wire distribution line to the terminal part 2, or the transformer of the single-phase three-wire distribution line itself. Even if a voltage of 200 V between the two voltage lines P1 and P3 is erroneously applied between the voltage line terminals 1S and 3S and the neutral line terminal 2S in the terminal portion 2 due to an erroneous connection to the terminal 10, etc. Due to the opening control of the first switch 6a and the second switch 6b, the load is not immediately applied to the loads 11a and 11b. For this reason, when an abnormal voltage is measured by the electronic watt-hour meter 1, the electronic watt-hour meter 1 can take appropriate measures to prevent a failure or accident from occurring.

また、本実施形態による単相三線式電子式電力量計１によれば、電子式電力量計１において端子部２に異常な電圧が計測される場合、制御部５によって表示部４に接続異常が表示させられることで、電子式電力量計１の設置作業者等に異常な電圧の発生が認識される。このため、設置作業者等は、この異常な電圧の発生を認識することで、単相三線式配電線の端子部２への誤接続を速やかに正したり、単相三線式配電線自体のトランス１０への誤接続を速やかに正したりする等の適切な対処を迅速に行うことが可能になる。   Further, according to the single-phase three-wire electronic wattmeter 1 of the present embodiment, when an abnormal voltage is measured at the terminal unit 2 in the electronic wattmeter 1, the control unit 5 causes the display unit 4 to have an abnormal connection. Is displayed, the operator of the electronic watt-hour meter 1 or the like recognizes the occurrence of an abnormal voltage. Therefore, by recognizing the generation of the abnormal voltage, the installer or the like can quickly correct the erroneous connection of the single-phase three-wire distribution line to the terminal portion 2 or can fix the single-phase three-wire distribution line itself. It is possible to quickly take appropriate measures such as quickly correcting an erroneous connection to the transformer 10.

なお、上記の実施形態では、電圧線端子１Ｓまたは３Ｓと中性線端子２Ｓとの間に現れる第１の電圧または第２の電圧に２本の電圧線Ｐ１，Ｐ３間の電圧が監視されると、制御部５によって第１の開閉器６ａおよび第２の開閉器６ｂの双方が開かれる場合について、説明した。しかし、第１の開閉器６ａおよび第２の開閉器６ｂの双方ではなく、２本の電圧線Ｐ１，Ｐ３間の電圧が監視される一方の電圧線端子１Ｓまたは３Ｓと中性線端子２Ｓとの間だけを開くように構成してもよい。   In the above embodiment, the voltage between the two voltage lines P1 and P3 is monitored for the first voltage or the second voltage appearing between the voltage line terminal 1S or 3S and the neutral line terminal 2S. The case where both the first switch 6a and the second switch 6b are opened by the control unit 5 has been described. However, not both the first switch 6a and the second switch 6b, one of the voltage line terminals 1S or 3S for monitoring the voltage between the two voltage lines P1 and P3 and the neutral line terminal 2S and It may be configured to open only between the spaces.

また、上記の実施形態では、電力量を表示する表示部４に接続異常がメッセージ等で表示させられる場合について説明したが、表示部４とは別にランプ等を設け、接続異常が検出された場合にそのランプ等を単に光らせるように構成してもよい。   Further, in the above-described embodiment, the case where the connection abnormality is displayed by a message or the like on the display unit 4 that displays the electric energy has been described. However, a lamp or the like is provided separately from the display unit 4 so that the case where the connection abnormality is detected. Alternatively, the lamp or the like may be simply lit.

１…単相三線式電子式電力量計
２…端子部
３…計量部
４…表示部
５…制御部
６ａ，６ｂ…開閉器
７ａ，７ｂ…電流計
８ａ，８ｂ…電圧計
９…短絡線
１０…トランス
１１ａ，１１ｂ，１１ｃ…負荷
１Ｓ，３Ｓ…電圧線端子
２Ｓ…中性線端子
Ｐ１，Ｐ３…電圧線
Ｐ２…中性線 DESCRIPTION OF SYMBOLS 1 ... Single-phase three-wire electronic watt-hour meter 2 ... Terminal part 3 ... Metering part 4 ... Display part 5 ... Control part 6a, 6b ... Switch 7a, 7b ... Ammeter 8a, 8b ... Voltmeter 9 ... Short-circuit wire 10 ... Transformers 11a, 11b, 11c ... Load 1S, 3S ... Voltage line terminal 2S ... Neutral terminal P1, P3 ... Voltage line P2 ... Neutral line

Claims (2)

単相三線式配電線の２本の電圧線が接続される２つの電圧線端子および１本の中性線が接続される１つの中性線端子を有する端子部と、前記配電線から前記端子部を介して負荷へ供給される電力量を計量する計量部と、前記配電線および前記負荷間の接続を開閉して前記配電線から前記負荷への電力供給を断続する開閉器とを備える単相三線式電子式電力量計において、
一方の前記電圧線端子および前記中性線端子間の電圧を測定する第１の電圧測定部と、他方の前記電圧線端子および前記中性線端子間の電圧を測定する第２の電圧測定部と、前記第１の電圧測定部で測定される第１の電圧および前記第２の電圧測定部で測定される第２の電圧を監視する監視部と、前記第１の電圧または前記第２の電圧に２本の前記電圧線間の電圧が前記監視部によって監視されると前記開閉器を開く制御部とを備えることを特徴とする単相三線式電子式電力量計。 A terminal portion having two voltage line terminals to which two voltage lines of a single-phase three-wire type distribution line are connected and one neutral line terminal to which one neutral line is connected; A measuring unit for measuring the amount of electric power supplied to the load via the unit, and a switch for opening and closing the connection between the distribution line and the load to intermittently supply power from the distribution line to the load. In a phase three-wire electronic wattmeter,
A first voltage measuring unit for measuring a voltage between one of the voltage line terminals and the neutral terminal, and a second voltage measuring unit for measuring a voltage between the other voltage line terminal and the neutral terminal A monitoring unit that monitors the first voltage measured by the first voltage measurement unit and the second voltage measured by the second voltage measurement unit; and the first voltage or the second voltage A single-phase three-wire electronic watt-hour meter, comprising: a control unit that opens the switch when a voltage between the two voltage lines is monitored by the monitoring unit. 表示部を備え、
前記制御部は、前記第１の電圧または前記第２の電圧に２本の前記電圧線間の電圧が前記監視部によって監視されると前記表示部を表示させる
ことを特徴とする請求項１に記載の単相三線式電子式電力量計。 Equipped with a display,
The said control part makes the said display part display, when the voltage between two said voltage lines is monitored by the said monitoring part by the said 1st voltage or the said 2nd voltage. The single-phase three-wire electronic wattmeter described.
JP2018182950A 2018-09-27 2018-09-27 Single-phase three-wire electronic watt-hour meter Pending JP2020051951A (en)

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CN115598566A (en) * 2022-12-13 2023-01-13 麦田能源有限公司（Cn） Method and device for checking electric meter wiring, processor and electronic equipment

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JP2004286687A (en) * 2003-03-25 2004-10-14 Tokyo Keiki Kogyo Kk Watthour meter
JP2006071600A (en) * 2004-09-06 2006-03-16 Toshiba Corp Watthour meter
JP2009222432A (en) * 2008-03-13 2009-10-01 Toshiba Corp Watt-hour meter
JP2015117994A (en) * 2013-12-18 2015-06-25 大崎電気工業株式会社 Watthour meter
JP2016217742A (en) * 2015-05-14 2016-12-22 オムロン株式会社 Electric energy calculation system

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JP2004286687A (en) * 2003-03-25 2004-10-14 Tokyo Keiki Kogyo Kk Watthour meter
JP2006071600A (en) * 2004-09-06 2006-03-16 Toshiba Corp Watthour meter
JP2009222432A (en) * 2008-03-13 2009-10-01 Toshiba Corp Watt-hour meter
JP2015117994A (en) * 2013-12-18 2015-06-25 大崎電気工業株式会社 Watthour meter
JP2016217742A (en) * 2015-05-14 2016-12-22 オムロン株式会社 Electric energy calculation system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115598566A (en) * 2022-12-13 2023-01-13 麦田能源有限公司（Cn） Method and device for checking electric meter wiring, processor and electronic equipment
CN115598566B (en) * 2022-12-13 2023-05-09 麦田能源有限公司 Ammeter wiring inspection method and device, processor and electronic equipment

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