JP4690680B2 - Electricity meter - Google Patents

Description

  The present invention relates to a watt-hour meter that measures the amount of power used.

  Generally, when electricity is supplied from an electricity supplier to an electricity consumer, the electricity meter measures and displays the amount of power used by the consumer.

  FIG. 4 is a block diagram showing an example of a conventional watt-hour meter.

  The watt-hour meter 1 is an electronic watt-hour meter. The watt-hour meter 1 measures the amount of power supplied from the power supply facility 2 to the load 3.

  The input terminal 4 of the watt-hour meter 1 is connected to the power supply facility 2 via the distribution line 5. When wired normally, the input terminal 4 can energize one end of the power line 5a included in the distribution line 5 and one end of the internal conductor 6a, and one end of the power line 5b included in the distribution line 5 and one end of the internal conductor 6b. And one end of the neutral wire 5c included in the distribution line 5 and one end of the internal conductor 6c can be energized.

  The output terminal 7 of the watt-hour meter 1 is connected to the load 3 via the distribution line 8. When wired normally, the output terminal 7 can energize one end of the power line 8a included in the distribution line 8 and the other end of the internal conductor 6a, and one end of the power line 8b included in the distribution line 8 and the internal conductor 6b. The other end can be energized, and one end of the neutral wire 8c included in the distribution line 8 and the other end of the internal conductor 6c can be energized.

  That is, the input terminal 4 and the output terminal 7 of the watt hour meter 1 are connected by the internal conductors 6 a to 6 c of the watt hour meter 1.

  Inside the watt hour meter 1, the voltage detection unit 9 detects a voltage component with respect to the power supplied from the power supply facility 2 to the load 3 as an electric signal from the input terminal 4. For example, the voltage detection unit 9 detects the voltage between the internal conductor 6a and the internal conductor 6c and the voltage between the internal conductor 6b and the internal conductor 6c.

  The current detection unit 10 detects a current component as an electrical signal from the inner conductor 6a and the inner conductor 6b.

  The power calculation unit 11 performs multiplication of the voltage value detected by the voltage detection unit 9 and the current value detected by the current detection unit 10 based on the electrical signal of the voltage component and the electrical signal of the current component, Find the power value.

  The central processing unit 12 accumulates the calculated power values and obtains the amount of power used.

  The display unit 13 displays the amount of power used.

  For example, in the single-phase three-wire distribution system, as shown in FIG. 5, a potential difference (for example, 100 V) between the power line 5a and the neutral line 5c and between the power line 5b and the neutral line 5c. There is a potential difference between the power line 5a and the power line 5b that is twice the rating (for example, 200V).

An electronic watt-hour meter disclosed in Japanese Patent Application Laid-Open No. 2004-138494 determines whether the phase sequence of the voltage of multiphase power supplied from the outside is a normal phase sequence or a reverse phase sequence, and the determination Display the results. As a result, the operator can know whether the phase sequence is connected so as to be normal.
JP 2004-138494 A

  In the conventional watt-hour meter 1 as described above, an abnormal voltage is applied to the internal devices and internal circuits of the watt-hour meter 1 due to miswiring of the worker performing the installation. Internal circuit may fail.

  Moreover, in the conventional watt-hour meter 1, a protection circuit for suppressing an abnormal voltage may be provided between the input terminal 4 and the internal device and internal circuit. In the conventional watt-hour meter 1 provided with the protection circuit, erroneous measurement may be performed by the operation of the protection circuit.

  For example, in a single-phase three-wire distribution system, when an operator mistakenly wires the power line 5a and the neutral line 5c in reverse, a voltage twice the rated voltage is applied to the voltage detection unit 9. become. When the protection circuit operates in this state, it is difficult for an operator to find an abnormality at the time of attachment, and the watt-hour meter 1 may be operated with incorrect wiring.

  In the electronic watt hour meter disclosed in the above Japanese Patent Application Laid-Open No. 2004-138494, it is displayed whether the phase sequence of the voltage of the multiphase power is the normal phase sequence or the reverse phase sequence. However, no consideration has been given to miswiring between the power line 5a and the neutral line 5c.

  The present invention has been made in view of the above circumstances, and detects an incorrect wiring at the time of installation by an operator, prevents an erroneous operation due to an incorrect wiring, and enables safe and appropriate power trading. The purpose is to provide a meter.

  Specific means taken for realizing the present invention will be described below.

The above-described problems include an input terminal connected to the power supply facility via the first distribution line, an output terminal connected to the load via the second distribution line, a connection means for connecting the input terminal and the output terminal, and power Voltage detection means for detecting a voltage value applied to the connection means by the supply facility, current detection means for detecting a current value flowing through the connection means, and power calculation means for obtaining a power value based on the voltage value and the current value Use amount calculation means for accumulating the power value to obtain the amount of power used, determination means for determining whether or not the voltage value belongs to a predetermined voltage allowable range set for detecting erroneous wiring, and use This can be solved by a watt-hour meter comprising display means for displaying an electric energy and displaying an erroneous wiring warning when the voltage value does not belong to the allowable voltage range.
Here, the first distribution line includes a first power line, a second power line, and a neutral line, and the connection means includes a first conductor connected to the first power line when the wiring is normally wired; The second conductor connected to the power line and the third conductor connected to the neutral line, and the allowable voltage range is a rated voltage value between the first power line and the neutral line and the second power line and the neutral line. The voltage detection means includes a first voltage value between the first conductor and the third conductor, and a second conductor and a third conductor. The second voltage value between the first voltage value and the second voltage value is detected, the determination means determines whether the first voltage value and the second voltage value belong to a voltage allowable range, and the display means determines the first voltage value and the second voltage value. When at least one of the two does not belong to the allowable voltage range, an erroneous wiring warning indicating that an erroneous connection of the first distribution line has occurred is displayed.
The determination unit of the watt-hour meter stores warning data including date information when it is determined that the voltage value does not belong to the voltage allowable range. The watt hour meter further includes transmission means for transmitting warning data to the outside.

  In the present invention, erroneous wiring at the time of attachment can be detected, erroneous operation due to erroneous wiring can be prevented, and safe and appropriate power transactions can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts as those in FIG. 4 and FIG.

  FIG. 1 is a block diagram showing an example of a watt-hour meter according to the present embodiment.

  The energy meter 14 includes an input terminal 4, an output terminal 7, internal conductors 6a to 6c, a voltage detection unit 9, a current detection unit 10, a power calculation unit 15, a central calculation unit 16, a display unit 17, a storage unit 18, and a setting unit. 19 and a transmission unit 20 are provided. In addition, the central calculation unit 16 includes a usage amount calculation unit 16a and a determination unit 16b. For the recording unit 18, for example, a nonvolatile memory, a hard disk, or the like is used.

  The watt-hour meter 14 is an electronic watt-hour meter, and measures the amount of power used by consumers.

  The voltage detector 9 detects a voltage component (first voltage value) between the internal conductor 6a and the internal conductor 6c as an electrical signal, and a voltage component (second voltage value) between the internal conductor 6b and the internal conductor 6c. ) As an electric signal and provided to the power calculation unit 15.

  The voltage detection unit 9 may detect the first voltage value and the second voltage value at the input terminal 4.

  The current detection unit 10 detects the current component (first current value) in the internal conductor 6 a as an electrical signal, detects the current component (second current value) in the internal conductor 6 b as an electrical signal, and provides it to the power calculation unit 15. To do.

  The power calculation unit 15 calculates the product of the first voltage value detected by the voltage detection unit 9 and the first current value detected by the current detection unit 10, and the second voltage value and current detected by the voltage detection unit 9. The power value is obtained from the product of the second current value detected by the detection unit 10 and provided to the usage calculation unit 16a of the central calculation unit 16.

  In addition, the power calculation unit 15 provides the first voltage value and the second voltage value to the determination unit 16 b of the central calculation unit 16.

  The usage amount calculation unit 16a receives the power value from the power calculation unit 15, obtains the usage power amount from a value obtained by accumulating the power value, obtains the maximum power amount in a predetermined period, and the like. Measurement data 18 a including the amount of power is provided to the display unit 17, and the measurement data 18 a is stored in the storage unit 18.

  The setting unit 19 receives a setting of a predetermined voltage allowable range based on the rated voltage, and stores setting data 18b including the set voltage allowable range in the storage unit 18.

  For example, a range of plus 10% to minus 10% of the rated voltage is set as the voltage allowable range for the first voltage value. Similarly, a range of plus 10% to minus 10% of the rated voltage is set as a voltage allowable range for the second voltage value.

  The determination unit 16 b periodically receives the first voltage value and the second voltage value from the voltage detection unit 9 via the central calculation unit 16.

  The determination unit 16 b determines whether both the first voltage value and the second voltage value belong to the voltage allowable range represented by the setting data 18 b stored in the storage unit 18. Thereby, it is determined whether the voltage value between the internal conductor 6a and the internal conductor 6c and the voltage value between the internal conductor 6b and the internal conductor 6c are out of the range used in the rating. Done.

  If the determination unit 16b determines that both the first voltage value and the second voltage value belong to the allowable voltage range, the determination unit 16b notifies the display unit 17 that the wiring is normal.

  On the other hand, when the determination unit 16b determines that at least one of the first voltage value and the second voltage value does not belong to the allowable voltage range, the determination unit 16b notifies the display unit 17 that the wiring is incorrect. In addition, when the determination unit 16b determines that at least one of the first voltage value and the second voltage value detected by the voltage detection unit 9 does not belong to the allowable voltage range, information indicating that the wiring is incorrect. The storage unit 18 stores warning data 18c including the date and time information when the erroneous wiring is detected.

  The transmission unit 20 receives a transmission request from an external device via a network, and transmits the measurement data 18a and the warning data 18c stored in the storage unit 18 to the external device.

  When the display unit 17 receives a notification that the wiring is normal from the determination unit 16b, the display unit 17 displays the amount of power used, the maximum amount of power in a predetermined period, and the like based on the measurement data 18a from the usage amount calculation unit 16a. .

  On the other hand, the display unit 17 displays a warning regarding incorrect wiring when receiving a notification of incorrect wiring from the determination unit 16b.

  FIG. 2 is a diagram illustrating an example of the relationship between the voltage value and the wiring when the rated voltage is 100V.

  In normal wiring, the power line 5a and the internal conductor 6a, the power line 5b and the internal conductor 6b, and the neutral line 5c and the internal conductor 6c are connected. However, in FIG. 2, the power line 5b and the internal conductor 6c are connected, and the neutral line 5c and the internal conductor 6b are connected, resulting in erroneous wiring.

  In this case, since the voltage value between the inner conductor 6a and the inner conductor 6c exceeds the allowable voltage range, the watt-hour meter 14 detects an incorrect wiring and displays that it is an incorrect wiring.

  FIG. 3 is a flowchart showing an example of the operation of the watt-hour meter 14.

  In step S1, the voltage detector 9 detects the first voltage value and the second voltage value.

  In step S <b> 2, the determination unit 16 b determines whether both of the two voltage values detected by the voltage detection unit 9 belong to the set voltage allowable range.

  When both of the two voltage values belong to the allowable voltage range, in step S3, the display unit 17 displays the measurement data 18a because it is a normal wiring. Thereafter, the process returns to step S1.

  On the other hand, when at least one of the two voltage values belongs to the voltage allowable range, in step S4, the display unit 17 displays a warning indicating that the wiring is incorrect.

  In the present embodiment described above, the watt-hour meter 14 measures the amount of power used. In the watt-hour meter 14, a warning is displayed on the display unit 17 when an abnormal voltage is applied to the internal device or the internal circuit due to an incorrect wiring of the installation contractor.

  Therefore, it is possible to prevent damage to the internal devices and internal circuits of the watt-hour meter 14, to prevent inappropriate weighing operation, and to prevent accidents and incorrect operation and measurement due to incorrect wiring of the installer. It is possible to realize safe and appropriate power trading.

  In the present embodiment, the voltage value is provided from the voltage detection unit 9 to the determination unit 16b via the power calculation unit 15. However, for example, the voltage value is directly provided from the voltage detection unit 9 to the determination unit 16b. It may be.

  In the present embodiment, erroneous wiring is detected based on whether or not the first voltage value and the second voltage value belong to the allowable voltage range. However, this detection technique can be changed.

  For example, the miswiring may be detected based on whether or not the peak value of the first voltage value and the peak value of the second voltage value belong to the voltage peak value allowable range.

  In addition, the voltage value between the inner conductor 6a and the inner conductor 6b is within an allowable range set based on a voltage value that is twice the rating (for example, a range of plus 10% to minus 10% that is twice the rating). You may detect the case where it does not belong as an incorrect wiring.

  In the present embodiment, each component may be rearranged as long as the same operation can be realized, each component may be freely combined, and each component may be freely divided. Alternatively, some components may be deleted.

  The usage amount calculation unit 16a and the determination unit 16b in the present embodiment may be realized by the central processing unit 16 executing a process specified by a computer program.

  INDUSTRIAL APPLICABILITY The present invention is effective in the field of watt hour meters that measure the amount of power used by consumers when electricity is supplied from electricity suppliers to electricity consumers.

The block diagram which shows an example of the watt-hour meter which concerns on embodiment of this invention. The figure which shows the example of the relationship between a voltage value and wiring. The flowchart which shows the example of operation | movement of the watt-hour meter which concerns on embodiment of this invention. The block diagram which shows an example of the conventional watt-hour meter. The figure which shows an example of a single phase 3 wire type power distribution system.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,14 ... Electricity meter, 2 ... Electric power supply equipment, 3 ... Load, 4 ... Input terminal, 5, 8 ... Distribution line, 5a, 5b, 8a, 8b ... Electric power line, 5c, 8c ... Neutral wire, 6a- 6c ... Internal conductor, 7 ... Output terminal, 9 ... Voltage detection unit, 10 ... Current detection unit, 11, 15 ... Power calculation unit, 12, 16 ... Central calculation unit, 13 ... Display unit, 16a ... Use calculation unit, 16b Determining unit, 17 ... Display unit, 18 ... Storage unit, 18a ... Measurement data, 18b ... Setting data, 18c ... Warning data, 19 ... Setting unit, 20 ... Transmission unit

Claims (2)

An input terminal connected to the power supply facility via the first distribution line;
An output terminal connected to the load via the second distribution line;
Connection means for connecting the input terminal and the output terminal;
Voltage detection means for detecting a voltage value applied to the connection means by the power supply facility;
Current detecting means for detecting a current value flowing through the connecting means;
Power calculating means for obtaining a power value based on the voltage value and the current value;
Usage amount calculating means for accumulating the electric power value to obtain an electric energy consumption;
Determining means for determining whether or not the voltage value belongs to a predetermined voltage allowable range set for erroneous wiring detection;
Displaying the amount of power used, and a display means for displaying an incorrect wiring warning when the voltage value does not belong to the allowable voltage range,
The first distribution line includes a first power line, a second power line, and a neutral line,
The connection means includes a first conductor connected to the first power line, a second conductor connected to the second power line, and a third conductor connected to the neutral line when normally wired. And
The allowable voltage range is set based on a rated voltage value between the first power line and the neutral line and a rated voltage value between the second power line and the neutral line. And
The voltage detection means detects a first voltage value between the first conductor and the third conductor and a second voltage value between the second conductor and the third conductor;
The determining means determines whether the first voltage value and the second voltage value belong to the voltage allowable range;
The display means is the erroneous wiring warning indicating that an erroneous connection of the first distribution line has occurred when at least one of the first voltage value and the second voltage value does not belong to the allowable voltage range. It is displayed, and
The determination means stores warning data including date and time information determined that the voltage value does not belong to the voltage allowable range,
A watt-hour meter further comprising transmission means for transmitting the warning data to the outside . The watt-hour meter according to claim 1,
A watt hour meter further comprising setting means for accepting a setting operation of the allowable voltage range.

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