JP2019120532A - Distribution line inspection system - Google Patents

Abstract

To provide a distribution line inspection system capable of inspecting erroneous wire connection and a pattern thereof in addition to erroneous wiring with a simple configuration.SOLUTION: A distribution line inspection system comprises a plurality of resistance adders (11) and a measurement device (13). Each of the resistance adders (11) has first and second resistors (37 and 39) uniquely combined, resistance values of which are different for each resistance adder (11). The measurement device (13) includes three voltage application terminals (49), two current sensors (45), a computation unit (71) for identifying the resistance adder (11) connected to a watt-hour meter (105) via a distribution line (109) on the basis of the amplitude of current detected by the current sensors (45) and determining erroneous wire connection of the distribution line (109) and a pattern thereof, and a display unit (67) for displaying the identification result and the determination result obtained from the computation unit (71).SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to a distribution line inspection system used to inspect miswiring and misconnections of distribution lines installed in a building having a plurality of rooms, such as apartments and apartments and apartment buildings and tenant buildings.

  In a building such as an apartment house, a plurality of watt-hour meters according to the number of rooms (the number of dwelling units) are often installed at one place in a state of being housed in the same instrument panel. When performing centralized management of such watt-hour meters, it is necessary to extend a distribution line connecting the distribution board provided for each room and the watt-hour meter in a building, and the distribution lines are drawn for a long time. Distribution lines may be incorrectly wired. If the distribution line is miswired, the watt-hour meter will measure the amount of power in the room to be accommodated and the amount of power in the other room, resulting in an incorrect charge for the electricity usage charge. .

  Therefore, in order to prevent occurrence of such erroneous charging, a system has been proposed which inspects incorrect wiring of distribution lines.

  For example, Patent Document 1 discloses a wiring route inspection system including a transmitter and a receiver. In this wiring route inspection system, when the transmitter is connected to the outlet installed in the house, the inspection signal is sent to the distribution line using the current from the commercial power source, and the receiver is It is connected to the load side of the watt-hour meter, detects the inspection signal from the current flowing through the distribution line, and displays the code represented by the inspection signal on the display. According to such a wiring route inspection system, the worker checks which residence the distribution line of the watt-hour meter to be inspected is wired to by checking the code displayed on the display of the receiver. be able to.

Unexamined-Japanese-Patent No. 2010-002243

  By the way, when connecting a distribution line to a power meter and a distribution board, it may be mistakenly connected by human error. For example, when using a single-phase three-wire distribution line as a distribution line connecting a power meter and a distribution board, the first voltage line or the second voltage line may be provided on one side of the power meter and the distribution board. Misconnections (connection errors of distribution line terminals) can occur in a plurality of patterns in which the first and second voltage lines are reversely connected or the first and second voltage lines are reversely connected. If the distribution line is incorrectly connected, the electricity meter will measure a value different from the amount of power used, resulting in an incorrect charge for the electricity usage fee.

  In the wiring route inspection system of Patent Document 1, in addition to the dwelling unit to which the distribution line of the watt-hour meter is wired, the presence or absence of the erroneous connection as described above can be checked, but the erroneous connection It is not possible to check what kind of pattern it is. In addition, the wiring route inspection system adopts communication technology for exchanging a string code between the transmitter and the receiver through the distribution line, and the system configuration of the transmitter and the receiver is complicated, and the system It is expensive itself.

  The technique of the present disclosure has been made in view of the foregoing, and an object thereof is to provide a distribution line inspection system capable of inspecting misconnections and patterns thereof in addition to miswirings with a simple configuration. It is.

  In order to achieve the above object, in the technology of the present disclosure, a plurality of resistors constituting a combination of unique (unique) resistance values are added to the primary side of the distribution board, and the resistance values of the respective resistors are added. Currents of various magnitudes are detected on the secondary side of the watt-hour meter via the distribution line, and it is possible to inspect the miswiring and misconnection of the distribution line from the combination of the magnitudes of the currents flowing in the distribution line.

  Specifically, the technology of the present disclosure inspects incorrect wiring and erroneous wiring in a single-phase three-wire distribution line that respectively connects a plurality of distribution boards and a power meter provided for each of the distribution boards. Intended for distribution line inspection system.

  A distribution line inspection system according to the technology of the present disclosure includes a plurality of resistance adders connected to the primary side of a distribution board, and a measuring device connected to the secondary side of a power meter. The resistive adder has first and second resistances added between different distribution lines. The resistance value of the first resistor and the second resistor is different in each resistor adder, and the combination of the resistance values in the first and second resistors is different for each resistor adder. Then, the measuring device includes a voltage application terminal for applying a predetermined voltage to the distribution line, and at least two current sensors for detecting the magnitudes of the currents flowing in the different distribution lines by application of the voltage by the voltage application terminals, and the currents Based on the magnitude of the current detected by the sensor, the resistance adding device connected to the connected watt-hour meter via the distribution line is identified and the presence or absence of misconnection of the distribution line and the misconnection pattern are determined It has an operation part and a display part which displays the decision result by the operation part.

  In this configuration, the distribution line inspection system includes a plurality of resistance adders and a measuring device. The resistor adding device is configured to add first and second resistances between different distribution lines when connected to the primary side of the distribution board. These first and second resistors form a circuit with the three distribution lines. The resistance values of the first and second resistors are different from each other, and are also different for each resistor adding device to form a unique combination. The resistor adder is installed in association with each distribution board to which a distribution line to be inspected is connected.

  On the other hand, the measuring device includes a voltage application terminal for applying a voltage to the distribution line, at least two current sensors for detecting a current flowing in the distribution line, and an operation unit for identifying a resistance addition device and determining misconnection. It has a display part which displays an identification result and a determination result. The current sensor is connected to the primary side of the distribution board, and is mounted on the distribution board side relative to the connection point of the voltage application terminals in the distribution line. The magnitude of the current flowing in the circuit including the distribution line and the first and second resistors is detected. The magnitude of the current detected by the current sensor varies in accordance with the resistance value of the resistor added between the distribution lines by the resistor adder.

  The calculation unit utilizes the fact that the current detected by the current sensor changes for each resistance adding device, since the resistance values of the first and second resistors form a unique combination, and the detection is performed by the current sensor Based on the current, the resistive adder at the distribution board to which the current sensor attached distribution line is connected is identified. At this time, if the distribution line is correctly wired, the resistance adding device installed in relation to the distribution board to which the distribution line should be connected is identified, but the distribution line is incorrectly wired. A resistor adder other than the resistor adder installed in association with the distribution board to which the distribution line should be connected is identified. Therefore, the worker confirms that the identified resistance adding device is installed in relation to which distribution board based on the identification result displayed on the display unit, whereby the distribution line is incorrect. You can check if it is wired.

  In addition, since the calculation unit has resistance values of the first resistance and the second resistance that are different from each other, the resistance added between the distribution lines may be the first resistance or the second resistance. Based on the current detected by the current sensor, the current is detected based on the fact that the magnitude of the current detected by the current sensor is changed depending on whether it is a first resistance and a second resistance connected in series. Whether or not there is a misconnection in the distribution board of the connection destination of the distribution line to which the sensor is attached and the pattern of the misconnection are determined. At this time, if the distribution line is correctly connected, the current sensor attached to any distribution line detects a current having a magnitude corresponding to the correct connection relationship between the first resistance and the second resistance with respect to the distribution line. However, if the distribution line is incorrectly connected, a second resistance or a first resistance and a second resistance connected in series are added between the distribution lines to which the first resistance should be added. Or at least one current sensor to distribute a first resistance and a first resistance and a second resistance connected in series between distribution lines to which a second resistance should be added. A current of a different magnitude than when the wires are correctly connected is detected. Since the combination of the magnitudes of the currents detected by the current sensor when there is a misconnection of the distribution line differs depending on the misconnection pattern, the computing unit erroneously responds to the combination of the magnitudes of the currents detected by the current sensor The pattern of wire connections can be determined. Therefore, the worker can check the presence or absence of the incorrect connection by checking the determination result displayed on the display unit, and can check even the incorrect connection pattern if there is an incorrect connection.

  In such a distribution line inspection system, the combined resistance value by the series connection of the first resistance and the second resistance is different from the resistance value of the first and second resistances of each resistance adder, and each resistance adder Are preferably different.

  According to this configuration, the combined resistance value of the first resistor and the second resistor of each resistor adder is made different from the first resistor and the second resistor of each resistor adder, so that each resistor adder is unique. Because the distribution line is misconnected, the first resistance and the first resistance connected in series between the distribution lines to which the first resistance or the second resistance should be added are connected. When a resistance of 2 is added and a current of a magnitude corresponding to the combined resistance value flows, the magnitude of the current detected by the current sensor is detected by the current sensor when the distribution line is correctly connected. Can be distinguished from the magnitude of the Thereby, it is possible to inspect in detail the miswiring and miswiring of the distribution line, and if there is miswiring, how the wiring is wrong or if there is miswiring, the distribution line You can do an exhaustive check of how each connection is incorrect.

  Also, the computing unit identifies the resistive adder connected via the distribution line to the watt-hour meter to which the measuring device is connected based on the ratio of the magnitudes of the currents detected by the respective current sensors, and It is preferable to determine the presence or absence of a wire misconnection and the pattern of a wire misconnection.

  When the voltage is applied by the voltage application terminal in a state where the resistive adder is connected to the primary side of the distribution board, the magnitude of the current flowing through the distribution line is not limited to the resistance value of the first and second resistors. The resistance value of the distribution line itself also affects. Therefore, the magnitude of the current detected by the current sensor varies due to the influence of the resistance value of the distribution line itself. In the above configuration, the identification of the resistor adding device and the determination of the misconnection of the distribution line are performed based on the ratio of the magnitudes of the currents detected by the respective current sensors. It can be suppressed that the resistance value of the distribution line itself is reflected in the determination of the incorrect wire connection, and the identification and the determination can be performed with high accuracy.

  For the first resistor, it is preferable that the resistors having the same resistance value in each resistor adder be used, and in the second resistors, resistors having resistance values different from each other be used in each resistor adder.

  According to this configuration, the first resistor has the same resistance value in each resistor adder, and only the resistance value of the second resistor is made different. Therefore, the resistance value of the second resistor of each resistor adder is Setting resistance values of the first resistor and the second resistor in each resistor adder relatively simply by providing variation with the number of resistor adders with a value different from that of the resistor 1 it can.

  In addition, the technology of the present disclosure relates to miswiring and misconnection in N (N is an integer of 3 or more) distribution lines that respectively connect a plurality of distribution boards and a watt-hour meter provided for each of the distribution boards. It also covers distribution line inspection systems for inspection.

  A distribution line inspection system according to the technology of the present disclosure includes a plurality of resistance adders connected to the primary side of a distribution board, and a measuring device connected to the secondary side of a power meter. The resistive adder has first to (N-1) resistances added between the distribution lines different from each other. The resistances of the first to (N-1) resistors are different from each other in each resistor adding device, and the combination of the resistance values in the first to (N-1) resistors is different for each resistor adding device. And a measuring device detects the magnitude | size of the electric current which flows into a mutually different distribution line by the voltage application terminal which applies a voltage to a distribution line, and the application of the voltage by the voltage application terminal. At least (N-1) pieces of current sensors And a computing unit that determines the presence / absence and pattern of misconnection and a resistor adder connected via a distribution line to the watt-hour meter at the connection destination based on the magnitude of the current detected by the current sensor, and And a display unit that displays the determination result of the calculation unit.

  In this configuration, the distribution line inspection system includes a plurality of resistance adders and a measuring device. The resistive adder is configured to add first to (N-1) th resistances between different distribution lines when connected to the primary side of the distribution board. These first to (N-1) resistors form a circuit together with a plurality of distribution lines. The resistance values of the first to (N-1) resistors are different from each other, and are also different for each resistor adding device to form a unique combination. The resistor adder is installed in association with each distribution board to which a distribution line to be inspected is connected.

  On the other hand, the measuring device includes a voltage application terminal for applying a voltage to the distribution line, at least (N-1) current sensors for detecting the current flowing in the distribution line, and identification of a resistor adder and determination of misconnection. It has an operation part to perform, and a display part which displays an identification result and a judgment result. When the resistance adding device is attached to the primary side of the distribution board and is attached to the distribution board side relative to the connection point of the voltage application terminals in the distribution line, a plurality of current sensors are applied by application of voltage by the voltage application terminals The current flowing in the circuit including the distribution line and the first to (N-1) th resistances is detected. The current detected by the current sensor varies in accordance with the resistance value of the resistor added between the distribution lines by the resistor adder.

  The calculation unit uses the fact that the current detected by the current sensor changes for each resistance adding device, since the resistance values of the first to (N−1) th resistances form a unique combination, Based on the current detected by the sensor, to identify a resistor adding device in the distribution board to which the current sensor is attached and to which the distribution line is connected. At this time, if the distribution line is correctly wired, the resistance adding device installed in relation to the distribution board to which the distribution line should be connected is identified, but the distribution line is incorrectly wired. A resistor adder other than the resistor adder installed in association with the distribution board to which the distribution line should be connected is identified. Therefore, the worker confirms that the identified resistance adding device is installed in relation to which distribution board based on the identification result displayed on the display unit, whereby the distribution line is incorrect. You can check if it is wired.

  In addition, since the calculation unit has resistance values different from the first resistance to the (N−1) th resistance, it is possible to determine whether the resistance added between the distribution lines is the first resistance, Based on the current detected by the current sensor, utilizing the fact that the current detected by the current sensor changes depending on whether the resistance is 2 or the first resistance and the second resistance connected in series with each other. It is determined whether or not there is a misconnection in the distribution board of the connection destination of the distribution line to which the current sensor is attached and a pattern of the misconnection. At this time, if the distribution line is correctly connected, the current sensor attached to any of the distribution lines detects a current having a magnitude according to the correct connection relationship of the first to the (N-1) th resistors with respect to the distribution line However, if the distribution lines are incorrectly connected, the first to the (N-1) th resistances are placed between the distribution lines to which the first to the (N-1) th resistances should be added. Among them, a resistance different from the corresponding resistance and a number of resistances connected in series are added, so that at least one current sensor detects a current having a magnitude different from that in the case where the distribution line is correctly connected. Since the combination of the magnitudes of the currents detected by the current sensor when there is a misconnection of the distribution line differs depending on the misconnection pattern, the computing unit erroneously responds to the combination of the magnitudes of the currents detected by the current sensor The pattern of wire connections can be determined. Therefore, the worker can check the presence or absence of the incorrect connection by checking the determination result displayed on the display unit, and can check even the incorrect connection pattern if there is an incorrect connection.

  According to the above-described distribution line inspection system, in addition to the erroneous wiring, the presence of the erroneous connection can be inspected with a simple configuration, and if there is an erroneous connection, the pattern of the erroneous connection can also be inspected. As a result, even one or a small number of workers can efficiently inspect the incorrect wiring and the incorrect connection of the distribution line, and the incorrect connection or incorrect wiring found in the inspection can be identified on the display unit. And correct based on the determination result quickly and reliably.

It is a conceptual diagram which shows the wiring system of an apartment house. It is a conceptual diagram which shows the wiring relationship of the watt-hour meter of a collective instrument panel, and the electricity distribution panel of each dwelling unit. It is a conceptual diagram which shows the connection relation of a watt-hour meter and a distribution board. It is a schematic diagram showing composition of a distribution line inspection system. It is a figure which shows the structure of the resistive adder which comprises a distribution line test | inspection system. It is a figure which shows the resistance circuit which a resistive adder has. It is a figure which shows the structure of the measuring device which comprises a distribution line test | inspection system. It is a block diagram which shows the component of a measuring device roughly. It is a conceptual diagram which shows a mode that a distribution line is test | inspected using a distribution line test | inspection system in the wiring relation (There is incorrect wiring in the 101st room, the 102nd room) of the power meter of a collective instrument panel and the distribution board of each dwelling unit. It is a conceptual diagram which shows a mode that a distribution line is test | inspected using a distribution line test | inspection system in the wiring relation (There is a miswiring in the 102nd room and the 103rd room) of the power meter of a collective instrument panel and the distribution board of each dwelling unit. It is a conceptual diagram which shows a mode that a distribution line is test | inspected using a distribution line test | inspection system in the connection relation (normality) of a wattmeter and a distribution board. It is a conceptual diagram which shows a mode that a distribution line is test | inspected using a distribution line test | inspection system in the connection relation (there is a misconnection of a 1st voltage pole and a neutral pole) of a power meter and a distribution board. It is a conceptual diagram which shows a mode that a distribution line is test | inspected using a distribution line test | inspection system in the connection relation (with incorrect connection with a 1st voltage electrode and a 2nd voltage electrode) of a wattmeter and a distribution board. It is a conceptual diagram which shows a mode that a distribution line is test | inspected using a distribution line test | inspection system in the connection relation (with incorrect connection with a neutral pole and a 2nd voltage electrode) of a wattmeter and a distribution board. It is a conceptual diagram which shows a mode that a distribution line is test | inspected using a distribution line test | inspection system in the connection relation (with 3 voltage poles with a misconnection) of a power meter and a distribution board. It is a conceptual diagram which shows a mode that a distribution line is test | inspected using a distribution line test | inspection system in the connection relation (with 3 voltage poles with a misconnection) of a power meter and a distribution board.

  Hereinafter, exemplary embodiments will be described in detail based on the drawings.

  The distribution line inspection system according to this embodiment is used to inspect miswiring and misconnection of a distribution line installed in a building having a plurality of rooms such as apartment buildings and apartment buildings such as apartment buildings and apartments. Below, the case where it uses for the inspection of the distribution line of an apartment house is mentioned as an example, and the said distribution line inspection system is mentioned and demonstrated.

  The conceptual diagram of the power distribution system 111 of the apartment complex 100 is shown in FIG. In FIG. 2, the conceptual diagram of the wiring relationship of the watt-hour meter 105 of the collective instrument panel 103 and the electricity distribution panel 103 of each dwelling unit 101 is shown. Further, FIG. 3 shows a conceptual diagram of a connection relationship between the watt-hour meter 105 and the distribution board 103. As shown in FIG. In addition, in FIG.1 and FIG.2, the three distribution lines 109 are abbreviate | omitted and represented by one line.

  In the apartment complex 100, as shown in FIG. 1, a plurality of dwelling units 101 exist, and a distribution board 103 is installed in each dwelling unit 101. In addition, watt-hour meters 105 (a plurality of watt-hour meters 105 according to the number of dwelling units) for integrating and measuring the power consumed by each dwelling unit 101 are installed at one place in a state housed in the same collective instrument panel 107 ing.

  Each watt-hour meter 105 in the collective instrument panel 107 and the distribution board 103 of the corresponding dwelling unit 101 are connected in a one-to-one relationship by a distribution line 109 installed in the building, as shown in FIG. A single-phase three-wire distribution system using three distribution lines 109 is adopted for the distribution system 111 of the apartment house 100. Each of the watt-hour meters 105 is connected to the power system 115 directly, for example, via a transformer installed in an electric room or a hand hole (not shown) or through a lead-in wire 113.

  The power system 115 is an AC power system compatible with a single-phase three-wire system, in which a power company supplies power to consumers. The electric power drawn from the electric power system 115 into the multiple dwelling unit 100 through the lead-in line 113 is supplied to the distribution board 103 of each dwelling unit 101 after passing through each electric power meter 105. Distribution board 103 is a circuit installation corresponding to a single-phase three-wire system and accommodates various breakers such as a wiring breaker and an earth leakage breaker (not shown), and the power supplied from power system 115 is stored in dwell unit 101 It is comprised so that it may distribute to loads, such as an electric equipment, via the branch line laid down.

  The distribution lines 109 are three ungrounded first voltage lines 121 and second voltage lines 123, and a neutral line 125 grounded. Hereinafter, when the first voltage line 121, the second voltage line 123, and the neutral line 125 are not distinguished from one another, they are referred to as a distribution line 109. As shown in FIG. 3, one end of each of the first voltage line 121, the second voltage line 123, and the neutral line 125 is connected to the secondary side of the watt-hour meter 105, and the first voltage line 121 is connected. The other ends of the second voltage line 123 and the neutral line 125 are connected to the primary side of the distribution board 103, respectively.

  The first voltage line 121 electrically connects the terminal 127 of the first voltage pole (L 1) in the watt-hour meter 105 and the terminal 129 of the first voltage pole (L 1) in the distribution board 103. The neutral wire 125 electrically connects the terminal 131 of the neutral electrode (N) in the watt-hour meter 105 and the terminal 133 of the neutral electrode (N) in the distribution board 103. The second voltage line 123 electrically connects the terminal 135 of the second voltage pole (L 2) in the watt-hour meter 105 and the terminal 137 of the second voltage pole (L 2) in the distribution board 103.

  The terminals of the watt-hour meter 105 and the distribution board 103 have identification displays for each corresponding voltage pole. As identification display, color-coded display, symbol display, etc. are used. In color-coded display, for example, red marks are attached to terminals 127 and 129 of the first voltage pole, white marks are attached to terminals 131 and 133 of the neutral pole, and black is attached to terminals 135 and 137 of the second voltage pole. Marked. In the symbol display, for example, the terminals 127 and 129 of the first voltage pole are assigned the number “1”, the terminals 131 and 133 of the neutral pole are assigned the number “2”, and the terminal 135 of the second voltage pole , 137 are assigned the number "3".

  The first voltage line 121, the second voltage line 123, and the neutral line 125 are color-coded with respect to the identification display of the terminals 127 to 137. Specifically, the first voltage line 121 is covered with a red insulator. The second voltage line 123 is covered with a black insulator. The neutral wire 125 is covered with a white insulator. As a result, the correspondence between the first voltage line 121, the second voltage line 123 and the neutral line 125 and the terminals 127 to 137 of the voltage poles to which these distribution lines 109 should be connected can be visually understood. ing.

  When the distribution line 109 is correctly connected, the ground voltage of the neutral line 125 is 0 V, and the first voltage pole (L1) and the neutral pole (N), and the second voltage pole (L2) An alternating voltage of 100 V is generated between the) and the neutral pole (N). The voltage between the first voltage pole (L1) and the neutral pole (N) and the voltage between the second voltage pole (L2) and the neutral pole (N) are opposite in phase. is there. Therefore, an alternating voltage of 200 V is generated between the first voltage pole (L1) and the second voltage pole (L2).

  That is, the distribution system 111 forms three different phases by the combination of the distribution lines 109. The first phase is a 100V phase (L1-N phase) consisting of a combination of a first voltage pole (L1) and a neutral pole (N). The second phase is a 100 V phase (L2-N phase) opposite to the first phase consisting of a combination of the second voltage pole (L2) and the neutral pole (N). The third phase is a 200 V phase (L1-L2 phase) which is a combination of the first voltage pole (L1) and the second voltage pole (L2).

  The distribution line 109 is erroneously wired to the distribution board 103 of the dwelling unit 101 different from the dwelling unit 101 planned for the distribution line 109 due to an artificial error in the laying work, or the incorrect voltage pole terminal 127 to 137 It may happen to be connected to If the distribution line 109 is miswired or miswired, the corresponding watt-hour meter 105 measures a value different from the amount of power used, resulting in an incorrect charge for the power usage fee. In addition, since the period until the miswiring or misconnection of the distribution line 109 is detected is long, the guarantee amount tends to be large.

  The distribution line inspection system 10 according to this embodiment is a system for inspecting the miswiring and misconnection of the distribution line 109 after the completion of the collective housing 100 in order to prevent such an erroneous charge of the electricity bill.

  Hereinafter, the configuration of the distribution line inspection system 10 will be described with reference to FIGS. 4 to 8 respectively. FIG. 4 is a schematic configuration diagram of the distribution line inspection system 10. FIG. 5 is a schematic block diagram of the resistance adding device 11. As shown in FIG. FIG. 6 is a circuit diagram of the resistor circuit 29 included in the resistor adding device 11. FIG. 7 is a schematic block diagram of the measuring device 13. FIG. 8 is a block diagram of the components of the measuring device 13. In FIG. 4, the plurality of resistor adders 11 are simplified in size with one exception.

  Distribution line inspection system 10 is provided with a plurality of resistance adders 11 and measuring instruments 13 as shown in FIG. 4. In this embodiment, an aspect in which twenty five resistance adders 11 are provided will be described as an example. In each resistance adding device 11, identification numbers “001” to “025” (shown below each resistance adding device 11 in FIG. 4) are written.

  The resistor adder 11 is a functional module connected to the primary side of the distribution board 103. As shown in FIG. 5, the resistance adding device 11 includes an apparatus main body 15 and three lead attachments 17 provided on the apparatus main body 15. The lead attachment 17 is composed of a cable 19 extending from the device body 15 and a connection terminal 21 of the alligator clip type (alligator clip type) provided at the tip of the cable 19.

  The three lead attachments 17 are connected to the first lead attachment 23 connected to the terminal 129 of the first voltage pole (L1) and the terminal 133 of the neutral pole (N) in the distribution board 103. 2 and the third lead attachment 27 connected to the terminal 137 of the second voltage pole (L2). The first to third lead attachments 23, 25 and 27 are color-coded according to the color corresponding to the corresponding voltage pole of the cover portion of the cable 19 and the connection terminal 21, and the terminals 129 and 133 of the voltage pole to be connected , 137 can be visually understood.

  A resistance circuit 29 is built in the device body 15. The resistance circuit 29 is, as also shown in FIG. 6, a first wire 31 connected to the cable 19 of the first lead attachment 23, a second wire 33 connected to the cable 19 of the second lead attachment 25, and , A third resistor 35 provided between the end of the first wire 31 and the end of the second wire 33, and a second wire 35 connected to the cable 19 of the third lead attachment 27; A second resistor 39 is provided between 33 and the third wiring 35.

  When the resistive adder 11 is connected to the primary side of the distribution board 103, the first wiring 31 is connected to the terminal 129 of the first voltage pole (L1) of the distribution board 103 via the terminal 129. Are electrically connected to the distribution line 109. The second wiring 33 is electrically connected to the distribution line 109 connected to the terminal 133 via the terminal 133 of the neutral pole (N) in the distribution board 103. The third wire 35 is electrically connected to the distribution line 109 connected to the terminal 137 of the second voltage pole (L 2) of the distribution board 103 via the terminal 137.

  The first resistor 37 is then added between the distribution line 109 connected to the terminal 129 of the first voltage pole (L1) and the distribution line 109 connected to the terminal 133 of the neutral pole (N). Ru. Also, the second resistor 39 is added between the distribution line 109 connected to the terminal 133 of the neutral pole (N) and the distribution line 109 connected to the terminal 137 of the second voltage pole (L2). Ru. Thus, the resistor adding device 11 forms a circuit for inspection of the distribution line 109 by connecting the distribution lines 109 with each other via the first resistor 37 and the second resistor 39.

  The resistance values of the first resistor 37 and the second resistor 39 are different in each resistor adding device 11. And the combination of the resistance value in these 1st resistance 37 and the 2nd resistance 39 is different for every resistance adder 11, and it is set so that the combination of a unique (unique) resistance value may be comprised. . Further, the combined resistance value by the series connection of the first resistor 37 and the second resistor 39 is different from the resistance value of the first resistor 37 and the second resistor 39 of each resistor adding device 11, and the resistance addition It is different for every vessel 11.

  In this embodiment, resistors having the same resistance value are used as the first resistors 37 in the respective resistor adders 11. Further, for the second resistor 39, resistors having resistance values different from each other in each resistor adding device 11 are used. The resistance values of the first resistor 37 and the second resistor 39 are set, for example, in the range of 100Ω to 10000Ω.

  The resistance value of the first resistor 37 is set to about the middle of the second resistor 39 in all the resistor adders 11. The resistance value of the first resistor 37 in this embodiment may be, for example, a value between the resistance value of the twelfth largest second resistor 39 and the resistance value of the thirteenth largest second resistor 39 or 13 The magnitude is set to be between the resistance value of the second largest resistance 39 and the resistance value of the 14th largest second resistance 39.

  The resistance value of the second resistor 39 is such that there is a difference of 100 Ω or more with the resistance value of the first resistor 37, preferably 150 Ω or more, more preferably 200 Ω or more It is set. The resistance value of the second resistor 39 is preferably 150 Ω or more, more preferably 200 Ω or more so that there is a difference of 100 Ω or more between the resistance values of the second resistors 39. Set to make a difference.

  The measuring instrument 13 is a functional module connected to the secondary side of the watt-hour meter 105. The measuring device 13 is configured to be battery-powered, and as shown in FIG. 7, the device body 41, three lead attachments 43 for voltage application provided on the device body 41, and two current sensors 45. And The lead attachment 43 is for applying a voltage to the distribution line 109, and a cable 47 extending from the device main body 41 and an alligator clip type (alligator clip type) voltage application terminal provided at the tip of the cable 47 And the VA terminal 49.

  The three lead attachments 43 are connected to the first lead attachment 51 connected to the terminal 127 of the first voltage pole (L1) and the terminal 133 for the neutral pole (N) in the watt-hour meter 105. 2 and the third lead attachment 55 connected to the terminal 135 of the second voltage pole (L2). These first to third lead attachments 51, 53, 55 are color-coded according to the color corresponding to the corresponding voltage pole of the cover portion of the cable 47 and the voltage application terminal 49, and the terminal 127 of the voltage pole to be connected The correspondence with 131, 135 is visually understood.

  As the current sensor 45, an electromagnetic induction type current sensor called a CT (Current Transformer) sensor is used. The current sensor 45 is configured of a cable 57 connected to the device main body 41 and a sensor main body 59 provided at the tip of the cable 57. The sensor main body 59 has a structure of a one-touch clamp type (clip type), and has a circuit storage portion 61 for storing a circuit including a magnetic core and a detection coil, and pivots around one end with respect to the circuit storage portion 61 It comprises a lid portion 63 which is attached as much as possible, and detects the current flowing in the distribution line 109 which has passed through the hollow portion 65 formed between the circuit storage portion 61 and the lid portion 63.

  The device body 41 includes a display unit 67 formed of a liquid crystal display or the like, a power switch 69 and a measurement switch 71 on the front. Further, although not shown, a status indicator lamp such as a power indicator comprising an LED (Light Emitting Diode) indicating the power ON / OFF status is also provided on the front of the device body 41. Furthermore, as shown in FIG. 8, the device main body 41 includes an arithmetic unit 73 including a central processing unit (CPU), and an EEPROM (electrically erasable programmable read-only memory) electrically connected to the arithmetic unit 73. A memory 75, a voltage supply unit 77 electrically connected to the lead attachment 43, and a replaceable drive battery 79 are incorporated.

  The memory 75 has a resistance between the distribution lines 109 based on the current detected by each current sensor 45, that is, a resistance between the first voltage line 123 and the neutral line 125, and a neutral line 125. A program for calculating the resistance value to the second voltage line 127 is stored. In addition to the memory 75, the display unit 67, the measurement switch 71, the status display lamp, and the voltage supply unit 77 are also electrically connected to the calculation unit 73.

  The voltage supply unit 77 applies a predetermined potential to the first to third lead attachments 51, 53, 55, and applies a predetermined voltage set in advance to each of the distribution lines 109. For example, a potential of about +10 V is applied to the first lead attachment 51, a potential of 0 V is applied to the second lead attachment 53, and a potential of about -10 V is applied to the third lead attachment 55, As the specified voltage, a DC voltage of 10 V is applied between the first voltage line 123 and the neutral line 125 and between the neutral line and the second voltage line 127, respectively.

  Arithmetic unit 73 causes voltage supply unit 77 to apply a voltage to each distribution line 109 when measurement switch 71 is pressed (ON), and according to the program read from memory 75, the resistance value between distribution lines 109 A resistance value calculation process is performed to calculate (the resistance value between the first voltage line 123 and the neutral line 125 and the resistance value between the neutral line 125 and the second voltage line 127). Hereinafter, for the sake of convenience, the resistance value between the first voltage line 123 and the neutral line 125 will be referred to as “the resistance value between L1 and N”, and the resistance between the neutral line 125 and the second voltage line 127. The value is referred to as "N-L2 resistance value".

  In the resistance value calculation process, the distribution board 103 is connected to the watt-hour meter 105 to which the first to third lead attachments 51, 53, 55 of the measuring instrument 13 are connected, and the distribution line 109 installed normally. When the resistor adder 11 is installed, a resistance value corresponding to the first resistor 37 is calculated as the L1-N resistance value, and a resistance value corresponding to the second resistance 39 is calculated as the N-L2 resistance value. It is calculated. The calculation unit 73 calculates the L1-N resistance value and the N-L2 resistance value based on the ratio of the current detected by each current sensor 45. As a result, it is suppressed that the resistance value of the distribution line 109 itself is reflected in the calculation of the L1-N resistance value and the N-L2 resistance value, and the connection of the resistance adding device 11 to the distribution board 103 causes the first The resistance values of the resistors respectively added between the voltage line 123 and the neutral line 125 and between the neutral line 125 and the second voltage line 127 are accurately calculated.

  Furthermore, the calculation unit 73 is connected to the watt-hour meter 105 to be inspected via the distribution line 109 based on the calculated two resistance values (the resistance value between L1-N and the resistance value between N-L2). Identify the resistor adder 11 The resistance values of the first resistor 37 and the second resistor 39 included in the resistor adder 11 constitute a unique combination, and the combined resistance value of the series connection of the first resistor 37 and the second resistor 39 is Since the resistance value of the first resistor 37 and the resistance value of the second resistor 39 in any of the resistor adders 11 are different from each other and are different for each of the resistor adders 11, the resistance value between L1 and N and between N2 and L2 If the resistance value is known, the resistor adder 11 corresponding to the two resistance values can be identified.

  At this time, if the distribution line 109 is correctly wired, the resistance adding device 11 installed in association with the distribution board 103 to which the distribution line 109 should be connected is identified. On the other hand, when the distribution line 109 is miswired, the resistance addition device 11 different from the resistance addition device 11 installed in relation to the distribution board 103 to which the distribution line 109 should be connected is identified Be done.

  In addition, based on the calculated two resistance values, the computing unit 73 determines the presence or absence of misconnection in the distribution board 103 of the distribution line 109 connected to the watt-hour meter 105 to be inspected and the misconnection pattern. Do. Since the resistance values of the first resistor 37 and the second resistor 39 are different from each other, if the L1-N resistance value and the N-L2 resistance value are known, the difference between the two resistance values (different ways) It is possible to determine whether or not there is a misconnection according to and, if there is a misconnection, specify the pattern of the misconnection.

  At this time, if the distribution line 109 is correctly connected, a first resistance value between the first voltage line 121 to which the first resistor 37 should be added and the neutral line 123 is set as the L1-N resistance value. The resistance of the second resistor 39 is measured as the N-L2 resistance between the neutral wire 123 and the second voltage wire 125 to which the resistance of the resistor 37 is measured and to which the second resistor 39 should be added. The value is measured. On the other hand, if the distribution line 109 is erroneously connected, the L1-N resistance value is set between the first voltage line 121 and the neutral line 123 to which the first resistor 37 should be added. The resistance value of the resistance different from the resistance 37 of 1 is measured, or the resistance value between the neutral line 123 to which the second resistance 39 should be added and the second voltage line 125 is as an N-L2 resistance value The resistance value of a resistor different from that of the second resistor 39 may be measured.

  Then, the calculation unit 73 outputs the above-described identification result of the resistance adding device 11 and the determination result of the incorrect wire connection to the display unit 67. The display unit 67 displays the identification numbers “001” to “025” of the resistance adding device 11 and the presence / absence of incorrect connection and the incorrect connection pattern as the identification result and the determination result by the operation unit 73. Here, since there are five patterns in single-phase three-wire erroneous wire connection, the following display, for example, can be considered as the display of the presence or absence of incorrect wire connection and the pattern of incorrect wire connection.

  If there is no incorrect connection, "normal" is displayed. When the first voltage line 121 and the neutral line 123 are reversely connected due to incorrect connection, "L1-N reverse connection" is displayed. When the first voltage line 121 and the second voltage line 125 are reversely connected by incorrect connection, "L1-L2 reverse connection" is displayed. When the neutral wire 123 and the second voltage wire 125 are reversely connected due to incorrect connection, “N−L2 reverse connection” is displayed. The first voltage line 121 is the distribution board 103 at the neutral terminal 133, the neutral line 123 is the distribution board 103 at the second voltage electrode terminal 137, and the second voltage line 125 is the distribution board In the case where each of the terminals 129 of the first voltage pole is shifted and connected at 103, "L1-N-L2 incorrect connection 1" is displayed. The first voltage line 121 is shifted to the terminal 1237 of the second voltage pole, the neutral line 123 to the terminal 129 of the first voltage pole, and the second voltage line 125 to the terminal 137 of the first voltage pole. When it has been connected, it is displayed as "L1-N-L2 incorrect connection 2".

  Next, an operation of inspecting the distribution lines 109 of the multi-family dwelling 100 using the above-described distribution line inspection system 10 will be described with reference to FIGS. FIGS. 9 and 10 are conceptual diagrams showing how the power distribution line 109 is inspected in the wiring relationship between the power meter 105 of the collective instrument panel 107 and the distribution panel 103 of each dwelling unit 101. 11 to 16 are conceptual diagrams showing how the inspection of the distribution line 109 is performed in connection between the wattmeter 105 and the distribution board 103.

  9 and 10, as in FIG. 2, three distribution lines 109 are represented by a single line, and only one voltage application terminal 49 and one current sensor 45 are omitted. Then, as a display example of the display unit 67, a display when the wire connection state is correct is shown. Moreover, in FIG. 11 to FIG. 16, the first voltage line 121 is indicated by a solid line, the neutral line 123 is indicated by a broken line, and the second voltage line 125 is indicated by a two-dot chain line. And as a display example of the display part 67, the display in case the resistance adder 11 installed in the electricity distribution panel 103 of the dwelling unit 101 of a 101st room is identified is shown.

  In order to inspect the distribution lines 109 of the multiple dwelling unit 100 using the distribution line inspection system 10, first, as shown in FIGS. 9 and 10, the plurality of resistance adding devices 11 are arranged on the distribution board 103 of each dwelling unit 101. Install each on the primary side. At this time, as shown in FIGS. 11 to 16, the connection terminal 21 of the first lead attachment 23 of the resistor adder 11 is connected to the terminal 129 of the first voltage electrode of the distribution board 103, and the second lead The connection terminal 21 of the attachment 25 is connected to the terminal 133 of the neutral pole of the distribution board 103, and the third lead attachment 27 is connected to the terminal 137 of the second voltage pole of the distribution board 103.

  Subsequently, the measuring instrument 13 is sequentially connected to the secondary side of each watt-hour meter 105 corresponding to the distribution board 103 in which the resistance adding device 11 is installed, and miswiring and misconnection of the distribution line 109 for each watt-hour meter 105 To check. At this time, for each watt-hour meter 105, the voltage application terminal 49 of the first lead attachment 51 of the measuring instrument 13 is connected to the terminal 127 of the first voltage pole of the watt-hour meter 105, and the second lead attachment The voltage application terminal 49 of 53 is connected to the terminal 131 of the neutral pole of the watt-hour meter 105, and the voltage application terminal 49 of the third lead attachment 55 is connected to the terminal 135 of the second voltage pole of the watt-hour meter 105. . Furthermore, one current sensor 45 is attached to the first voltage line 121, and the other current sensor 45 is attached to the second voltage line 125. Then, in a state where the power switch 69 is pressed (ON) to turn on the power of the measuring instrument 13, the measurement switch 71 is pressed (ON) to inspect the incorrect wiring and the incorrect connection of the distribution line 109.

  In addition, when the number of dwelling units of collective housing 100 exceeds the number of resistance application devices 11 (26 in this embodiment), after collecting resistance application devices 11 from distribution board 103 of dwelling unit 101 after inspection, it is not inspected. The resistance adding device 11 is replaced with the distribution board 103 of another dwelling unit 101, and the above inspection operation is repeated.

  If there is no miswiring in the distribution line 109 installed in the housing unit 100 in the inspection of the miswiring and misconnection of the distribution line 109, the measuring instrument 13 is placed on the secondary side of any of the watt-hour meters 105. Even in the inspection in the connected state, the display unit 67 displays the identification number of the resistance adding device 11 installed in association with the distribution board 103 to which the distribution line 109 should be connected.

  However, when there is a miswiring in the distribution line 109, the identification number of the resistance addition device 11 different from the resistance addition device 11 installed in relation to the distribution board 103 to which the distribution line 109 should be connected. Is displayed.

  For example, as shown in FIG. 9, the watt-hour meter 105 of the dwelling unit 101 of the 101st room is connected to the distribution board 103 of the dwelling unit 101 of the 102nd room due to erroneous wiring of the distribution line 109, and the power amount of the dwelling unit 101 of the 102nd room When the meter 105 is connected to the distribution board 103 of the dwelling unit 101 of the 101st room, the resistance is added when the measuring instrument 13 is connected to the secondary side of the watt-hour meter 105 of the 101st room. The identification number "002" of the resistance adding device 11 installed on the distribution board 103 of the dwelling unit 101 of the 102nd room is displayed on the display unit 67 as the identification number of the device 11. In addition, when the measuring instrument 13 is connected to the secondary side of the watt-hour meter 105 of the dwelling unit 101 of the 102nd room and inspected, the power distribution board 103 of the dwelling unit 101 of the 101st room is identified as the identification number of the resistance adding device 11. The identification number “001” of the installed resistance adding device 11 is displayed on the display unit 67.

  Further, as shown in FIG. 10, the watt-hour meter 105 of the dwelling unit 101 of the 102nd room is connected to the distribution board 103 of the dwelling unit 101 of the 103rd room due to erroneous wiring of the distribution line 109, and the power amount of the dwelling unit 101 of the 103rd room When the meter 105 is connected to the secondary side of the watt-hour meter 105 of the dwelling unit 101 of the 102nd room when the total 105 is connected to the distribution board 103 of the dwelling unit 101 of the 101st room and inspection is performed As the identification number of the resistance adder 11, the identification number "003" of the resistance adder 11 installed on the distribution board 103 of the dwelling unit 101 of the room 103 is displayed on the display unit 67. In addition, when the measuring instrument 13 is connected to the secondary side of the watt-hour meter 105 of the dwelling unit 101 of room 103 and inspected, the distribution board 103 of the dwelling unit 101 of room 102 is identified as the identification number of the resistance adding device 11. The identification number “002” of the installed resistance adding device 11 is displayed on the display unit 67.

  In the inspection of the miswiring and misconnection of the distribution line 109 described above, when the distribution line 109 installed in the housing unit 100 is correctly connected as shown in FIG. 11 and there is no misconnection, any of the power meters Also in the inspection in the state where the measuring instrument 13 is connected to the secondary side of 105, the computing unit 73 calculates the resistance value of the first resistor 37 as the L1-N resistance value, and the N-L2 resistance value. The resistance value of the second resistor 39 is calculated, and “normal” is displayed on the display unit 67 together with the identification number of the resistor adding device 11.

  However, when there is a misconnection in the distribution line 109, the first resistance value between the first voltage line 121 to which the first resistor 37 should be added and the neutral line 123 is set as the L1-N resistance value. The resistance value of the resistance different from that of the resistance 37 is measured, or the resistance value between the neutral line 123 to which the second resistance 39 should be added and the second voltage line 125 is set as the N-L2 resistance value. The resistance value of the resistance different from the resistance 39 of 2 is measured. In this case, the display unit 67 displays a misconnection pattern determined based on the two resistance values (the resistance value between L1 and N and the resistance value between N and L2).

  For example, as shown in FIG. 12, the first voltage line 121 is connected to the terminal 133 of the neutral pole of the distribution board 103 by the misconnection of the distribution line 109, and the neutral line 123 is connected to the third line of the distribution board 103. When connected to the terminal 129 of the 1 voltage pole, the resistance value of the first resistor 37 is calculated as the L1-N resistance value, and the first resistance 37 and the second resistance value are calculated as the N-L2 resistance value. The combined resistance value of the series connection with the resistor 39 is calculated. In this case, “L1-N reverse connection” is displayed on the display unit 67 together with the identification number of the resistance adding device 11.

  Further, as shown in FIG. 13, the first voltage line 121 is connected to the terminal 137 of the second voltage pole of the distribution board 103 by the misconnection of the distribution line 109, and the second voltage line 125 is divided. When connected to the terminal 129 of the first voltage pole of the board 103, the resistance value of the second resistor 39 is calculated as the L1-N resistance value, and the first resistance is calculated as the N-L2 resistance value. The resistance value of 37 is calculated. In this case, the display unit 67 displays “L1-L2 reverse connection” together with the identification number of the resistance adding device 11.

  Further, as shown in FIG. 14, the neutral wire 123 is connected to the terminal 137 of the second voltage pole of the distribution board 103 by the misconnection of the distribution line 109, and the second voltage line 125 is the distribution board 103. When it is connected to the terminal 133 of the neutral pole, the combined resistance value by series connection of the first resistor 37 and the second resistor 39 is calculated as the L1-N resistance value, and it is between N-L2 The resistance value of the second resistor 39 is calculated as the resistance value. In this case, the display unit 67 displays “N−L2 reverse connection” together with the identification number of the resistance adding device 11.

  Further, as shown in FIG. 15, the first voltage line 121 is connected to the terminal 133 of the neutral pole of the distribution board 103 by the misconnection of the distribution line 109, and the neutral line 123 is connected to the third line of the distribution board 103. When the second voltage line 125 is connected to the terminal 137 of the second voltage pole and the second voltage line 125 is connected to the terminal 129 of the first voltage pole of the distribution board 103, the second resistance The resistance value of the resistor 39 is calculated, and the combined resistance value by the series connection of the first resistor 37 and the second resistor 39 is calculated as the resistance value between N and L2. In this case, the display unit 67 displays "L1-N-L2 incorrect connection 1" together with the identification number of the resistance adding device 11.

  Further, as shown in FIG. 16, the first voltage line 121 is connected to the terminal 137 of the second voltage pole of the distribution board 103 by the miswiring of the distribution line 109, and the neutral line 123 is connected to the distribution board 103. When the second voltage line 125 is connected to the terminal 133 of the neutral pole of the distribution board 103, the first resistance value between L1 and N is set. A combined resistance value by series connection of the resistor 37 and the second resistor 39 is calculated, and the resistance value of the first resistor 37 is calculated as the resistance value between N and L2. In this case, the display unit 67 displays “L1−N−L2 incorrect connection 2” together with the identification number of the resistance adding device 11.

  In the inspection of the distribution line 109 using the distribution line inspection system 10 as described above, the worker can use any of the distribution of the identified resistance adding devices 11 based on the identification result displayed on the display unit 67 of the measuring device 13. By checking whether it is installed in association with the board 103, it can be checked whether or not the distribution line 109 is miswired. In addition, by checking the determination result displayed on the display unit 67 of the measuring instrument 13, the presence or absence of the incorrect connection can be confirmed, and if there is an incorrect connection, even the pattern of the incorrect connection can be checked. As a result, even one or a small number of workers can efficiently check the incorrect wiring and the incorrect connection of the distribution line 109 together, and the incorrect connection or incorrect wiring found in the inspection is displayed on the display unit 67. It is possible to correct quickly and reliably based on the identification result and the determination result.

  As described above, the preferred embodiments have been described as examples of the technology disclosed herein. However, the technology disclosed herein is not limited to this, and is also applicable to embodiments in which changes, replacements, additions, omissions, and the like are made as appropriate. Further, among the components described in the attached drawings and the detailed description, components which are not essential for solving the problem may be included. Therefore, the fact that those non-essential components are described in the attached drawings and the detailed description should not immediately mean that those non-essential components are essential.

  For example, the above-described embodiment may be configured as follows.

  In the distribution line inspection system 10, the measuring instrument 13 has a card socket on which a recording medium such as an SD card is mounted, and records the inspection result of the distribution line 109 in the recording medium mounted on the card socket. May be

  For example, as the inspection result of the distribution line 109, the display content on the display unit 67 and the connection state of each distribution line 109 are recorded for each dwelling unit 101, that is, for each power meter 105 corresponding to each dwelling unit 101. Ru. The connection status of the distribution line 109 is recorded as "o" or "x" whether the symbol of the voltage pole to which the distribution line 109 is connected and whether the connection of the distribution line 109 to the terminal of the voltage pole is correct or incorrect . That is, when the distribution line 109 is correctly connected, it is recorded as "L1: ○ N: ○ L2: ○", and the first voltage line 121 and the neutral line 123 are reversely connected. Is recorded as “L1: × N: × L2: ○”. In addition, when the incorrect connection of the distribution line 109 is found in the inspection and the incorrect connection of the distribution line 109 is corrected after the measurement instrument 13 detects the incorrect connection of the distribution line 109 again, the display contents on the display unit 67 and the respective distribution lines It is preferable to record the connection state of 109. Furthermore, the measuring device 13 may be able to display the inspection result of the distribution line 109 recorded on the recording medium on the display unit 67.

  According to such a configuration, since the inspection result of the distribution line 109 recorded in the recording medium can be viewed by the operator collectively on the display unit 67, the inspection of the distribution line 109 connected to the plurality of power meters 105 is performed. It is possible to easily check the dwelling unit 101 (electric energy meter 105) to which the distribution line 109 with incorrect wiring or misconnection is connected even after finishing the above, and the inspection work of the distribution line 109 can be smoothly performed become. In addition, since the inspection result of the distribution line 109 recorded in the recording medium can also be confirmed by a person who is not the operator after the inspection operation, it can be used for checking a third party for inspection omission or the like.

  In the above embodiment, although the single-phase three-wire distribution line 109 is inspected by the distribution line inspection system 10, the present invention is not limited to this, the distribution-line inspection system 10 also inspects a three-phase three-wire distribution line. It can be used. Further, the distribution line inspection system 10 may be configured to be used to inspect miswiring and misconnection in the three-phase four-wire distribution line 109.

  For example, in the distribution line inspection system 10 for inspecting miswiring and misconnection in the distribution line 109 of four wires, the first to third added between the different distribution lines 109 in the resistance circuit 29 of each resistance adding device 11 The three current sensors 45 detect the currents flowing in the different distribution lines 109 by the three current sensors 45, and the resistance values between the different distribution lines 109 from the currents detected by the respective current sensors 45. Calculation of the resistance addition device 11 in the operation unit 73 of the measuring device 13 based on the three resistance values, the presence or absence of misconnection of the distribution line 109, and the determination of the pattern when there is misconnection It is possible to

  Further, in the above embodiment, the measuring device 13 calculates the resistance value between L1 and N and the resistance value between N and L2 from the current detected by each current sensor 45, and then calculates the resistance value between L1 and N and N. If the measuring instrument 13 identifies the resistance adding device 11 connected via the distribution line 109 based on the resistance value between -L2 and if there is incorrect connection of the distribution line 109 or incorrect connection, the pattern is determined However, it is not limited to this. The measuring device 13 has a resistance value between the first resistance 37 and the second resistance 39 of each resistance adder 11 and a resistance between L1 and N depending on whether the distribution line 109 is correctly connected or incorrectly connected. The data indicating the correspondence relationship between the value and the magnitude of the current detected by the current sensor 45 according to the resistance value between N and L 2 is stored in advance in the memory 75, and the magnitude of the current detected by the current sensor 45 In the case where there is an identification of the resistance adding device 11, presence or absence of a misconnection of the distribution line 109, or a misconnection, the pattern may be determined.

  In short, the distribution line inspection system 10 includes N (N is an integer of 3 or more) distribution lines 109 each of which connects the plurality of distribution boards 103 and the watt-hour meter 105 provided for each of the distribution boards 103. When applied to a system for inspecting miswiring and miswiring, a plurality of resistance adders 11 connected to the primary side of the distribution board 103 and a measuring instrument connected to the secondary side of the power meter 103 13, and the resistor adding device 11 has first to (N-1) th resistors added between different distribution lines 109, and resistances of the first to (N-1) th resistors. The values differ from one another for each resistance adding device 11, and the combination of resistance values in the first to the (N-1) th resistances is different for each resistance adding device 11, and the measuring device 13 Application of voltage by voltage application terminal 49 which applies voltage and voltage application terminal 49 Thus, at least (N-1) current sensors 45 for detecting currents flowing in different distribution lines 109, and based on the currents detected by the current sensors 45 to the connected power quantity meter 105 via the distribution lines 109 A computing unit 73 for identifying the presence or absence of misconnection of the distribution line 109 and the misconnection pattern while identifying the connected resistance adding device 11, and a display unit 67 for displaying the identification result and the determination result by the computing unit 73 As long as it has it.

  In the above embodiment, a CT sensor is used as the current sensor 45, but the present invention is not limited to this. The CT sensor is only an example of the current sensor 45, and a Hall element type sensor or another type of sensor can be adopted as the current sensor 45 as long as the sensor can detect the current flowing through the distribution line 109.

  Further, in the above embodiment, the measuring instrument 11 uses the first to third lead attachments 51, 53, 55 to connect between the first voltage line 123 and the neutral line 125, and the neutral line and the second voltage line. Although the DC voltage is applied as the specified voltage between 127 and 127, the present invention is not limited to this. The specified voltage applied between the first voltage line 123 and the neutral line 125 and between the neutral line 125 and the second voltage line 127 may be a DC voltage or an AC voltage. However, from the viewpoint of eliminating the influence of the reactance component such as the distribution line 109, a DC voltage is preferable.

  Moreover, although the said embodiment gave and demonstrated the structure provided with 25 resistance addition devices 11 about the distribution line test | inspection system 10 as an example, it does not restrict to this. The resistance adder 11 may have 24 or less, and the resistance values of the first resistor 37 and the second resistor 39 of the resistor circuit 29 differ from each other to form a unique combination, and these two resistors If the value can be detected by the current sensor 45, 26 or more may be provided.

  Further, in the above embodiment, the misconnection of the distribution line 109 is determined by the direction of the current detected by the current sensor 45, the resistance value between the first voltage line 121 and the neutral line 123, the neutral line 123, Although the inspection is performed based on the resistance value between the two voltage lines 125, it is not limited thereto. The misconnection of the distribution line 109 is inspected using the resistance value between the first piezoelectric wire 121 and the second piezoelectric wire 125 in addition to or in place of either of the above two resistance values. Alternatively, the inspection may be performed based on only the resistance value between the distribution lines 109.

  As described above, the technology of the present disclosure is a distribution line inspection used to inspect miswirings and misconnections of distribution lines laid in a building having a plurality of rooms such as apartment buildings and apartment buildings and tenant buildings. Useful for the system.

DESCRIPTION OF SYMBOLS 10 Distribution line inspection system 11 Resistance attachment 13 Measuring device 15, 41 Device main body 17, 43 Lead attachment 19, 47, 57 Cable 21 Connection terminal 23, 51 1st lead attachment 25, 53 2nd lead attachment 27, 55 Third lead attachment 29 resistance circuit 31 first wiring 33 second wiring 35 third wiring 37 first resistance 39 second resistance 45 current sensor 49 voltage application terminal 59 sensor main body 61 circuit housing portion 63 lid portion DESCRIPTION OF SYMBOLS 65 Hollow part 67 Display part 69 Power switch 71 Measurement switch 73 Arithmetic part 77 Voltage supply part 79 Battery 100 Collective house 101 Housing unit 103 Distribution board 105 Electric energy meter 107 Collecting instrument panel 109, 115 Distribution line 111 Distribution system 113 Drop line 115 Power System 121 first voltage line 1 23 Neutral Wire 125 Second Voltage Wire 127, 129 First Voltage Pole Terminal 131, 133 Neutral Pole Terminal 135, 137 Second Voltage Pole Terminal

Claims (5)

A distribution line inspection system for inspecting miswiring and misconnection in a single-phase three-wire distribution line respectively connecting a plurality of distribution boards and a watt-hour meter provided for each of the distribution boards,
A plurality of resistor adders connected to the primary side of the distribution board;
A measuring device connected to the secondary side of the electricity meter;
The resistor adder has first and second resistors added between the different distribution lines,
The resistance values of the first resistor and the second resistor are different for each of the resistor adders, and the combination of the resistance values of the first and second resistors is different for each of the resistor adders.
The measuring device includes: a voltage application terminal for applying a predetermined voltage to the distribution line; and at least two current sensors for detecting magnitudes of currents flowing in the distribution lines different from each other by application of a voltage by the voltage application terminal; Based on the magnitude of the current detected by the current sensor, the resistance adding device connected to the watt-hour meter at the connection destination via the distribution line is identified, and the presence or absence of misconnection of the distribution line and misconnection A distribution line inspection system comprising: a calculation unit that determines the pattern of (1); and a display unit that displays the identification result and the determination result by the calculation unit. In the distribution line inspection system according to claim 1,
The combined resistance value by the series connection of the first resistance and the second resistance is different from the resistance value of the first and second resistances of the respective resistance adders, and is different for each resistance adder. Distribution line inspection system characterized in that. In the distribution line inspection system according to claim 1 or 2,
The calculation unit identifies the resistive adder connected to the watt-hour meter to which the measuring device is connected via the distribution line based on the ratio of the magnitudes of the currents detected by the current sensors. A distribution line inspection system characterized by determining presence or absence of misconnection of the distribution line and a pattern of misconnection. In the distribution line inspection system according to any one of claims 1 to 3,
For the first resistor, the same resistance value is used in each of the resistor adders,
The distribution line inspection system according to the present invention, wherein resistances different in resistance value are used in the respective resistance adding devices for the second resistance. Distribution line inspection for inspecting mis-wiring and mis-wiring in N (N is an integer of 3 or more) distribution lines respectively connecting a plurality of distribution boards and a watt-hour meter provided for each of the distribution boards A system,
A plurality of resistor adders connected to the primary side of the distribution board;
A measuring device connected to the secondary side of the electricity meter;
The resistive adder has first to (N-1) resistances added between the distribution lines different from one another.
The resistance values of the first to (N-1) resistors differ from one another in each of the resistor adders, and the combination of the resistance values in the first to (N-1) resistors is for each of the resistor adders. Different,
The measuring device includes a voltage application terminal for applying a voltage to the distribution line, and at least (N-1) pieces of currents for detecting magnitudes of currents flowing through the distribution line different from each other by application of a voltage by the voltage application terminal. Identify the sensor and the resistive adder connected to the watt-hour meter at the connection destination via the distribution line based on the magnitude of the current detected by the current sensor, and presence or absence of misconnection of the distribution line A distribution line inspection system comprising: a calculation unit that determines a pattern of misconnection and a display unit that displays the identification result and the determination result by the calculation unit.

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