JP6676882B2 - Power metering system - Google Patents

Description

  The present invention relates to a power metering system that measures the amount of power consumed at each customer's house.

  Conventionally, watt-hour meters have been installed on the outer wall surface of each customer's house, and meter readers regularly visit the customer's house to read the indicated value of the watt-hour meter. At this time, the meter reader visually inspects not only the meter reading but also the area around the watt-hour meter to confirm whether there is power theft or whether there is any damage to the meter. In addition, in order to eliminate the need for such meter reading, smart meters that have a communication function and transmit digitally measured power to a power company have recently become widespread.

  On the other hand, there is known a power usage monitoring device that can detect unauthorized use of power from the primary side (power supply side) of a power meter, that is, can detect power theft (for example, see Patent Document 1). . This device measures the total amount of electric power supplied from the transformer to the entire customer with a watt-hour meter, and preliminarily sets the estimation range of the amount of electric power that the entire customer receiving power from the transformer receives in a predetermined period. It is stored in the estimated power storage unit. Then, the power amount measured for a predetermined period measured by the watt hour meter is compared with the estimated range of the power amount stored in the estimated power storage unit, and when the measured power amount exceeds the estimated range of the power amount, it is determined that there is an abnormality. I do.

JP 2012-168127 A

  By the way, when replacing a conventional watt-hour meter with a smart meter or when replacing a meter regularly, it is necessary to visit each customer's home and perform work on the customer's premises. However, since the situation is different depending on each customer's house, replacement work may not only be difficult, but also may impose a burden on the customer or impair convenience.

  In addition, installing a smart meter eliminates the need for meter readers to visit each customer's home for meter reading, but it is still necessary to check the area around the smart meter to check for instrument damage or theft. Remains. On the other hand, the device disclosed in Patent Literature 1 can detect power theft, but cannot confirm whether the instrument is damaged or not. For this reason, even if a smart meter is installed, the amount of visiting work may not be reduced, and the cost may not be reduced.

  Accordingly, an object of the present invention is to provide a power metering system that is easy to install and that can reduce the amount of visiting work.

In order to solve the above-mentioned problem, the invention according to claim 1 is provided on a power pole or a low-voltage distribution board, a plurality of service lines connected to each customer's house and a low-voltage line on a power supply side are connected, and the service line is connected. A metering device that detects the power flowing to the customer's house side through the meter, and calculates the amount of power supplied to each customer's house, and is connected to the metering device so as to be freely communicable with the customer's house received from the metering device. A charge calculating device for calculating the electric power rate of each customer's house based on the supplied power amount, wherein the metering device or the charge calculating device has a resistance value of the service line from the measuring device to the customer's house. Calculating the amount of power consumed from the metering device to the customer's house based on the calculated power amount, and subtracting the power amount from the supplied power amount to obtain a true power consumption amount, Rates computing device, before Calculating a power rate of said each customer house based on said true power consumption and power rate menu for each demand house a power metering system, characterized in that.

  According to the present invention, the amount of power supplied to each customer's house is calculated by the metering device, the amount of power consumed in the service line from the metering device to the customer's house is calculated by the subtraction means, and the amount of power is calculated from the amount of power supplied. Is subtracted. Then, based on the supplied power amount (true power consumption amount) after the subtraction, the power calculation device calculates the power fee.

  According to a second aspect of the present invention, in the power metering system according to the first aspect, an end of the service line on the customer premises side of the service drop is connected to a home wiring of the customer premises via a connecting device so as to be freely connected to and separated from the customer premises. The connection device includes a measuring terminal for measuring a voltage and an insulation resistance of the drop wire and the home wiring.

  According to the first aspect of the present invention, since the metering device is installed on a utility pole or a low-voltage distribution board (in the case of an underground area), an electric power meter (smart meter) is installed at each customer's house. Not only can it be installed easily and inexpensively, but there is no risk of burdening the customer or impairing the convenience. In addition, there is no need to visit each customer's home for inspection and maintenance.In addition, by conducting inspections of the weighing device when conducting patrol inspections on telephone poles, low-voltage distribution boards, distribution lines, etc. The presence or absence of damage can be checked, and the amount of visit work can be reduced.

  On the other hand, the amount of power consumed by the service line from the metering device to the customer's house is subtracted from the supplied power amount, and the power rate is calculated based on the supplied power amount, that is, the true power consumption amount. Even if they are installed on telephone poles or low-voltage distribution boards, there is no disadvantage to consumers.

  According to the second aspect of the present invention, the drop wire and the in-home wiring can be freely connected to and separated from each other, and the connection device is provided with a measurement terminal. Therefore, the drop wire and the in-home wire are separated, and a voltage measuring device or an insulation measurement resistor is brought into contact with the measurement terminal. Only by this means, it is possible to easily and quickly measure the voltage and insulation resistance of the service line and the house wiring.

1 is a schematic configuration diagram illustrating a power metering system according to an embodiment of the present invention. It is a figure which shows the electric pole periphery of the power metering system of FIG. It is an enlarged view which shows the periphery of the lead-in arm of the telephone pole of FIG. FIG. 2 is a schematic configuration block diagram of a charge server of the power metering system of FIG. 1. FIG. 5 is a data configuration diagram of a customer database of the fee server in FIG. 4. It is a figure which shows the periphery of the connection apparatus of the power metering system of FIG.

  Hereinafter, the present invention will be described based on the illustrated embodiment.

  FIG. 1 is a schematic configuration diagram showing a power metering system 1 according to an embodiment of the present invention. The power metering system 1 is a system that measures the amount of power consumed in each customer's house H to calculate a power rate, and mainly includes a metering device 2, a fee server (charge calculating device) 3, and a connection device 4. Each of the weighing devices 2 and the fee server 3 are communicably connected. Here, in this embodiment, a case of a non-grounded area will be mainly described. Also, in FIG. 1, only the weighing device 2 and the like for one electric pole 101 are shown, but the same configuration is applied to all electric poles 101 and all customer houses H in the distribution network.

  The weighing device 2 is disposed on each utility pole 101, and as shown in FIGS. 1 and 2, a plurality of service lines 102 connected to each customer house H and a low-voltage line 103 on the power supply side are connected. This is a device that detects the power flowing to the customer house H through the interface and calculates the amount of power supplied to each customer house H. The weighing device 2 includes a terminal unit 21 disposed at both ends of the lead-in arm 104 of the utility pole 101, and a power calculation device 22 disposed below the terminal unit 21.

  As shown in FIG. 3, the terminal unit 21 includes a plurality of drop-in terminal boxes 23. To each drop-in terminal box 23, a low-voltage line 103 from a transformer (power supply side) 105 disposed above or below the drop-in arm 104 (upper in FIG. 2) is connected. One end of each line (each phase) 102a-102c of the drop line 102 is connected to 23a-23c. The other end of each of the lines 102a to 102c of the drop-in line 102 is connected to each line (each phase) 201a to 201c of the house wiring 201 of the customer house H as described later. Here, reference numeral 106 in FIGS. 1 and 2 denotes a messenger that is installed between the utility poles 101 and supports and holds the drop wire 102.

  In addition, each drop-in terminal box 23 has a detection function of detecting power flowing to the customer house H via the drop-in wire 102. That is, when the voltmeter and the ammeter are provided, and the power from the low-voltage line 103 flows through the service line 102 via the service terminal box 23 and is supplied to the customer house H, the voltage value and the current value of the power are provided. And measure

  On the other hand, the terminal unit 21 (each of the lead-in terminal boxes 23) is communicably connected to the power calculation device 22 via the signal line 24. Then, the power detected by each drop-in terminal box 23 (voltage value and current value as detection results) is transmitted to the power calculation device 22 in real time as a signal.

  The power calculation device 22 calculates the amount of power supplied to each customer house H based on the detection result from the terminal unit 21. That is, the supply power (W) is calculated from the voltage value and the current value detected by the drop-in terminal box 23, and the power supply for the time axis (each time) is obtained by constantly performing such calculation. Then, the supply power amount (Wh) is calculated based on the supply power and the duration thereof, that is, the supply power is temporally integrated. Such an operation is performed for each drop-in terminal box 23, that is, for each customer house H. Here, not only the active power but also the reactive power may be calculated and measured.

  Further, each power calculation device 22 is communicably connected to the charge server 3 via the communication line 25, and transmits the calculation result to the charge server 3 periodically at a predetermined timing, for example, monthly or daily. Here, the calculation result may be any data as long as the power rate can be calculated in the charge server 3, and varies depending on the type of contract with each customer. For example, data indicating power supply with respect to a time axis, a predetermined time of day, Data indicating the amount of power supplied for each band includes the total amount of power supplied for one month. In addition, in this embodiment, in order to calculate a later-described service wire power consumption in the fee server 3, the current value (the voltage value as necessary) detected in each service terminal box 23 is also transmitted to the fee server 3. .

  Further, the calculation result is transmitted for each drop-in terminal box 23, that is, for each customer house H. That is, when transmitting the calculation result, the meter number of the weighing device 2 (power calculation device 22) is transmitted, and the terminal box number of the drop-in terminal box 23 and the calculation result are associated and transmitted. Note that power is supplied from the transformer 105 to the power calculation device 22 via the low-voltage line 103.

  The charge server 3 is a server that is provided in the facility of the power company and calculates a power charge based on the amount of power supplied from the metering device 2. As shown in FIG. It includes a house database 32, a usage calculation task (subtraction means) 33, a charge calculation task 34, and a central processing unit 35 for controlling these.

  The communication unit 31 is an interface for communicating with each weighing device 2, another device, a server, and the like. The customer database 32 is a database that stores information (customer information) about each customer, and as shown in FIG. 5, for each contract number 321, a customer name 322, an address 323, a telephone pole number 324, an instrument number. 325, terminal box number 326, contract type 327, subtraction condition 328, last month's usage 329, and other 32a are stored.

  The contract number 321 stores a number for identifying a contract with the customer, the customer name 322 stores the name and name of the customer, and the address 323 stores the customer's house H of the customer. Is stored, and the telephone pole number 324 stores the identification information of the telephone pole 101 that draws the service line H into the customer house H. The instrument number 325 stores the identification information of the weighing device 2 (terminal unit 21) to which the service line 102 is connected to the customer house H. The terminal box number 326 stores the identification information of the customer house H. The identification information of the drop-in terminal box 23 to which the drop-in wire 102 is connected (information indicating which terminal box of the instrument number 325 is) is stored.

  The contract type 327 stores the type of contract content of the power rate menu with which this customer has contracted with the power company, for example, “metered light A”, “low-voltage power”, “family time plan 1”, and the like. The power rate can be calculated from this information. The subtraction condition 328 stores conditions necessary for calculating and subtracting the amount of power consumed by the service line 102 from the service terminal terminal box 23 to the customer house H in the usage amount calculation task 33. Specifically, the resistance value of the service wire 102 provided from the service terminal terminal box 23 of the target weighing device 2 to the customer house H (the connection device 4 that is the property demarcation point of the customer house H and the power company) is stored. Have been. In the last month usage amount 329, the power consumption amount of the last month is stored.

  The use amount calculation task 33 is based on the resistance value of the service wire 102 from the service terminal H to the customer house H, and determines the amount of power (service service consumption) between the service terminal H and the service house H based on the resistance value of the service wire 102 from the service terminal H to the customer house H. This is a task program for calculating the amount of power and subtracting the amount of power from the amount of supplied power. That is, since the amount of power supplied by the metering device 2 includes the amount of power consumed by the service line 102, this amount of power is subtracted from the amount of supplied power to obtain the true amount of power consumed at the customer house H. I do. At this time, the amount of power consumed by the service line 102 is calculated based on the resistance value of the service line 102.

  For example, when the calculation result that is the supplied power amount is received from the metering device 2 (the power calculation device 22), the customer information of the instrument number 325 and the terminal box number 326 that are the same as the instrument number and the terminal box number received at the same time is demanded. The customer database 32 is searched, and the subtraction condition 328 of the customer information is acquired. Next, based on the resistance value of the subtraction condition 328, the current value received from the measuring device 2, and the duration of the current value, the power is consumed in the service line 102 from the service terminal box 23 to the customer house H. Calculate the power amount. Subsequently, by subtracting this power amount from the corresponding supplied power amount, the true power consumption amount consumed at the customer house H, excluding the power amount consumed by the service line 102, is calculated. Such an operation is performed for all supplied power amounts.

  The charge calculation task 34 is a task program that calculates a power charge for the current month based on the amount of power consumed in the customer house H. That is, based on the supplied power amount (true power consumption amount) calculated by the usage amount calculation task 33 and the power rate menu of the contract type 327 of the customer house H, the power rate for the current month is calculated.

  The connection device 4 is disposed in each customer house H and connects the service line 102 and the house wiring 201 of the customer house H so as to be freely connected to and separated from each other. As shown in FIG. Is connected to the house wiring 201 of the customer house H via the connection device 4. That is, the wiring hole H1a is formed in the outer wall H1 of the customer house H, and one end of the house wiring 201 is exposed from the wiring hole H1a. A pedestal 41 of the connection device 4 is disposed on an outer wall H1 around one end of the in-home wiring 201, and a connection device main body 42 is installed on the pedestal 41.

  The connection device main body 42 has a circuit breaker inside, and the switch 43 can operate the circuit breaker. Further, three drop-in wire measurement terminals (measurement terminals) 44a to 44c and in-home wiring measurement terminals (measurement terminals) 45a to 45c are provided, and the drop-in wire measurement terminals 44a to 44c are connected to the respective wires 102a to 102c of the drop wire 102. Are connected, and the wires 201a to 201c of the home wiring 201 are connected to the home wiring measurement terminals 45a to 45c. When the switch 43 is in a steady state, the lines 102a to 102c of the service line 102 are electrically connected to the lines 201a to 201c of the house wiring 201, and when the switch 43 is operated to turn on the circuit breaker, the service line 102 and the house wiring 201 are connected. Is disconnected.

  Further, a cover (not shown) for covering the connection device main body 42 is detachably provided, and by removing this cover, the drop-in wire measuring terminals 44a to 44c and the in-home wiring measuring terminals 45a to 45c are exposed to the outside. Then, a voltage measuring instrument (tester) or a probe of an insulation measuring resistor or the like is brought into contact with the drop-in measuring terminals 44a to 44c or the home-wiring measuring terminals 45a to 45c, so that the voltage and the insulation resistance of the drop-in 102 and the home wiring 201 are measured. Can be measured.

  In addition, a display for uniquely identifying the customer is provided on the connection device 4 or in the vicinity thereof, so that it is possible to prevent a user from confusing the customer house H.

  Next, the operation of the power metering system 1 having such a configuration will be described.

  First, when electricity is used in each customer house H, the voltage value and the current value of the power are measured by the drop-in terminal box 23 of the corresponding metering device 2, and the voltage signal and the current signal are transmitted to the power calculation device 22. Sent in real time. Subsequently, the power calculation device 22 calculates the amount of power supplied to each customer house H, and transmits the calculation result and the current value used for the calculation to the fee server 3 at a predetermined timing. Then, the usage amount calculation task 33 is activated in a predetermined period, the amount of power consumed in the service line 102 from the service terminal box 23 to the customer house H is calculated, and the power amount is subtracted from the supplied power amount. Thus, the true power consumption is calculated. Subsequently, the charge calculation task 34 is started, and the power charge for the current month is calculated based on the true power consumption in the customer house H.

  On the other hand, the patrol person M who patrols the utility pole 100, the distribution line 110, and the like also inspects each of the weighing devices 2 at that time, and confirms whether the weighing devices 2 are damaged, whether there is power theft, and the like. When it is determined whether the cause of the power failure is on the power supply side (electric power company side) or the customer's house H, the circuit breaker of the connection device 4 is opened, and the service line 102 and the house wiring 201 are disconnected. Then, the voltage of the drop-in wire 102 and the in-home wiring 201 is measured by bringing a tester probe or the like into contact with the drop-in wire measuring terminals 44a to 44c and the in-home wiring measuring terminals 45a to 45c.

  As described above, according to the power metering system 1, since the metering device 2 is disposed on the utility pole 101, the power meter (smart meter) can be installed easily and inexpensively as compared with a case where a power meter (smart meter) is installed at each customer house H. In addition to this, there is no risk of burdening the customer or impairing the convenience. In addition, it is not necessary to visit each customer's house H at the time of inspection and maintenance of the watt hour meter, and the inspection of the metering device 2 can be performed at the same time as patrol inspection of the electric pole 101, the distribution line 110, and the like. Thus, it is possible to confirm the presence or absence of instrument damage or theft, and to reduce the amount of visit work.

  In addition, since the power computing device 22 is shared by a plurality of drop-in terminal boxes 23 and one power computing device 22 computes the amount of electric power supplied to a plurality of customer houses H, the cost of the metering device 2 can be reduced. The size can be reduced.

  On the other hand, the power consumed by the service line H from the metering device 2 to the customer house H is subtracted from the supplied power, and the power fee is calculated based on the supplied power after subtraction, that is, the true power consumption. For this reason, even if the metering device 2 is disposed on the utility pole 101 distant from the customer house H, there is no disadvantage to the customer.

  Further, in the customer's house H, the service line 102 and the in-home wiring 201 can be freely connected to and separated from each other via the connection device 4, and the connection device 4 includes measurement terminals 44 a to 44 c and 45 a to 45 c. For this reason, it is possible to easily and quickly measure the voltage between the drop wire 102 and the home wire 201 simply by separating the drop wire 102 and the home wire 201 and applying a tester probe or the like to the measurement terminals 44a to 44c and 45a to 45c. Become. In addition, since the connection device 4 only includes the circuit breaker and the measurement terminals 44a to 44c and 45a to 45c, it is possible to reduce the size and weight, and to compare the power meter (smart meter) to the case where the electricity meter (smart meter) is installed in the customer's house H. No installation space is required, and handling and maintenance are easy.

  Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above-described embodiment, and even if there is a design change or the like within a range not departing from the gist of the present invention, the present invention is not limited thereto. Included in the invention. For example, in the above embodiment, the case of the non-grounded area has been described. However, in the case of the grounded area, the measuring device 2 is provided in the low-voltage distribution board.

  Further, although the terminal unit 21 and the power calculation device 22 are separate bodies, they may be integrally formed, or may be integrally formed by including the terminal unit 21 in the lead-in arm 104. Further, the existing / existing drop-in terminal box may be provided with a detection function for detecting the electric power flowing to the customer house H side. In addition, each metering device 2 and the charge server 3 can communicate freely via the communication line 25, but power line communication (Power Line Communication) may be performed via a distribution line 110 provided on the electric pole 101.

  Further, the charge server 3 is provided with a use amount calculation task 33 as a subtraction means, but the power calculation device 22 of each weighing device 2 is provided with a subtraction means, and the consumption between the drop-in terminal box 23 and the customer house H is provided. The supplied power amount obtained by subtracting the power amount to be supplied may be transmitted to the fee server 3. That is, the resistance value of the drop line 102 is stored in the power calculation device 22, and the supply power is calculated from the voltage value and the current value detected by the drop line terminal box 23 as described above. The power consumed by the service line 102 is calculated from the resistance value. Then, this power is subtracted from the supplied power, the supplied power is temporally integrated to calculate the total supplied power, or data indicating the supplied power with respect to the time axis is created and transmitted to the charge server 3. I do. In this case, the fee server 3 calculates the power fee as the received power amount as the true power consumption.

DESCRIPTION OF SYMBOLS 1 Power metering system 2 Metering device 21 Terminal unit 22 Power calculator 23 Drop-in terminal box 3 Charge server (charge calculator)
32 Consumer database 33 Usage calculation task (subtraction means)
4 Connecting devices 44a to 44c Drop-in wire measurement terminals (measurement terminals)
45a-45c Measurement terminal for home wiring (measurement terminal)
DESCRIPTION OF SYMBOLS 101 Utility pole 102 Service line 103 Low-voltage line 201 In-house wiring H Consumer house M Patrol

Claims (2)

A plurality of service lines connected to each customer house and a low-voltage line on the power supply side are connected to a telephone pole or a low-voltage distribution board, and the power flowing to the customer house side via the service line is detected, and A metering device that calculates the amount of power supplied to each customer's home;
A fee calculation device that is communicably connected to the weighing device and calculates a power fee of each customer premises based on the supplied power amount of each customer premises received from the weighing device,
The metering device or the charge calculating device calculates an amount of power consumed between the metering device and the customer's house based on a resistance value of the drop line from the metering device to the customer's house, Subtraction means for subtracting the amount from the supplied power amount to obtain a true power consumption amount,
The fee calculation device calculates the power rate of each customer house based on the true power consumption of each customer house and a power rate menu ,
A power metering system, characterized in that: An end of the service line on the customer house side of the drop-in wire is connected to a house wiring of the customer house via a connection device so as to be freely connected and separated,
The connection device includes a measurement terminal for measuring the voltage and insulation resistance of the drop wire and the home wiring,
The power metering system according to claim 1, wherein:

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