JP5871132B2 - Power measurement unit and distribution board - Google Patents

Description

  Embodiments described herein relate generally to a power measurement unit that measures power consumption and a distribution board using the power measurement unit.

  Conventionally, in a distribution board for houses, a plurality of branch breakers are electrically connected along a conductive bar, and a load is connected to each branch breaker. Since the single-phase three-wire AC power is supplied through the main breaker, the conductive bar has three conductive bars, a neutral electrode and a pair of voltage electrodes. By switching the connection of the branch breaker to these three conductive bars, it is possible to supply AC power having a voltage corresponding to a 100V load and a 200V load.

  Some of such distribution boards include a power measurement unit that measures the power consumption for each load connected to each branch breaker and the power consumption of the entire house.

  In the power measuring unit, the current flowing from each branch breaker to the load side is detected by the current detection means, and the power is calculated from the detected current and the voltage of the load. Since the load voltage may be 100 V or 200 V, for example, the switch of the power measurement unit is switched to set the voltage of the load connected to each branch breaker or display it on the screen. The voltage of the load connected to each branch breaker is set.

Japanese Patent No. 4737050

  However, in the power measurement unit, it is necessary to set the voltage of the load connected to each branch breaker, and the setting becomes complicated when the number of branch breakers increases. In addition, there is a possibility that an error may occur when setting, and accurate power measurement may not be possible.

  The problem to be solved by the present invention is to provide a power measuring unit and a distribution board that do not require setting of the voltage of the load connected to the branch breaker, can be accurately set, and can accurately measure power. is there.

  The power measurement unit of the embodiment includes a voltage detection unit, a current detection unit, and a calculation unit. The voltage detection means detects a voltage from a conductive bar that supplies a single-phase three-wire AC power supply. The current detection means detects the current flowing from the branch breaker connected to the conductive bar to the load side, and detects the current detected by the 100 V load and the 200 V load with respect to the phase of the voltage detected by the voltage detection means. Install so that the phase is opposite. The calculation unit holds in advance information on the phase of the 100V load current detected by the current detection unit and the phase of the 200V load current detected by the current detection unit with respect to the voltage phase detected by the voltage detection unit. The calculation unit determines a load voltage from the phase of the voltage detected by the voltage detection unit and the phase of the current detected by the current detection unit, and calculates power based on the determined voltage of the load.

  According to the present invention, the current detection unit is installed so that the phase of the current detected by the load of 100 V and the load of 200 V is opposite to the phase of the voltage detected by the voltage detection unit, and the voltage detection is performed. Since the calculation unit holds in advance information on the phase of the 100V load current detected by the current detection unit and the phase of the 200V load current detected by the current detection unit with respect to the voltage phase detected by the unit, The load voltage is automatically determined from the phase of the voltage detected by the detection means and the phase of the current detected by the current detection means, and the power can be calculated based on the determined load voltage, and connected to the branch breaker. This eliminates the need to set the load voltage, and makes accurate measurement of power without error.

It is a schematic diagram of the electric current detection by the electric power measurement unit which shows one Embodiment. It is a wave form diagram which shows the relationship between the voltage detected by the electric power measurement unit, and the electric current for every voltage of the detected load. It is a block diagram of an electric power measurement unit. It is a perspective view of the conductive bar and branch breaker of a distribution board using an electric power measurement unit. It is a perspective view which shows the internal structure of a distribution board. It is a perspective view of a distribution board.

  Hereinafter, an embodiment will be described with reference to FIGS. 1 to 6.

  As shown in FIGS. 5 and 6, the distribution board 10 has a casing 11 installed on the wall surface. In the casing 11, a main breaker 12, a plurality of conductive bars 13, a plurality of branch breakers 14, a power measuring unit 15, and the like are arranged. A branch side device section 16 is configured by the conductive bar 13, the plurality of branch breakers 14, the power measurement unit 15, and the like.

  The branch side device unit 16 has a mounting plate 20 attached to the housing 11. On the mounting plate 20, a conductive bar 13, a plurality of branch breakers 14, a power measuring unit 15, and the like are integrally mounted. In the mounting plate 20, a conductive bar 13 is horizontally disposed in the central area in the vertical direction of the mounting plate 20 along the left-right direction, and a plurality of branch breakers 14 are horizontally disposed on the upper and lower sides of the conductive bar 13 arrangement region. It is mounted side by side in the direction.

  4 and 5, the conductive bar 13 supplies a single-phase three-wire AC power source from the main breaker 12 to the plurality of branch breakers 14 and the power measuring unit 15, and the neutral pole N A conductive bar 13a for a pair and conductive bars 13b and 13c for a pair of voltage electrodes L1 and L2 are used. These three conductive bars 13a, 13b, and 13c are arranged so as to overlap each other with an interval in the front-rear direction when viewed from the front surface of the distribution board 10.

  In addition, the plurality of branch breakers 14 are attached to the mounting plate 20 on the upper stage side and the lower stage side of the conductive bar 13 with the directions opposite to each other, and are electrically connected to the conductive bar 13.

  The branch breaker 14 includes a case 23 and a circuit interruption unit (not shown) disposed in the case 23.

  The case 23 is made of an insulating synthetic resin and has a narrow width when viewed from the front surface of the case 23 and is elongated in the vertical direction. A breaker handle 24 for manually operating the circuit breaker unit is arranged on the front side of the case 23, and one end side in the longitudinal direction when viewed from the front side of the case 23 is electrically connected to the conductive bar 13 A connecting portion 25 is formed, and an electric wire connecting portion 27 for connecting a pair of electric wires 26 from the load side is formed on the other end side.

  The power supply side connecting portion 25 is formed with three grooves 28a, 28b, 28c into which the respective conductive bars 13a, 13b, 13c are inserted, and two of the three grooves 28a, 28b, 28c have three. Terminals that are electrically connected to two of the two conductive bars 13a, 13b, and 13c are disposed. When the load side connected to the branch breaker 14 is 100 V, the conductive bar 13a for the neutral electrode N and one of the conductive bars 13b and 13c for the pair of voltage electrodes L1 and L2 are connected. As described above, in the case of 200 V, the grooves in which the terminals are arranged are different or switched so as to be connected to the pair of conductive bars 13b and 13c for the voltage electrodes L1 and L2. For example, when the load side is 100V, the upper branch breaker 14 is connected to the conductive bar 13a for the neutral electrode N and the conductive bar 13b for the voltage electrode L1, and the lower branch breaker 14 is When the load side is 100 V, they are connected to the conductive bar 13a for the neutral electrode N and the conductive bar 13c for the voltage electrode L2.

  The electric wire connecting portion 27 has a pair of insertion holes 29 into which a pair of electric wires 26 connected to the load side are inserted. In these insertion holes 29, there are provided locking terminals for preventing the inserted electric wires 26 from coming off in an electrically connected state.

  The circuit breaker unit can open and close the connection circuit between the terminal of the power supply side connection portion 25 and the locking terminal of the wire connection portion 27, and opens and closes the connection circuit according to the operation of the breaker handle 24, The connection circuit is automatically opened when an overcurrent exceeding a set value flows in the closed state of the connection circuit.

  As shown in FIG. 5, the power measurement unit 15 includes a plurality of sensor units 32 and a power measurement unit 33.

  The sensor unit 32 includes a sensor unit 32a arranged along the juxtaposing direction of the plurality of branch breakers 14 on the upper stage side, and a sensor unit 32b arranged along the juxtaposing direction of the plurality of branch breakers 14 on the lower stage side. Have.

  The sensor unit 32 has a case 35 that is formed horizontally. The case 35 is provided with a plurality of insertion holes 36 through which one of the predetermined wires 26 of the pair of wires 26 connected to each branch breaker 14 is inserted along the longitudinal direction. In addition, a plurality of insertion grooves 37 through which the other electric wire 26 is inserted are provided.

  In the case 35, for example, a plurality of current detection means 38 configured by a CT (Current Transformer) and outputting detection signals corresponding to currents flowing through the electric wires 26 inserted through the insertion holes 36 are arranged. . At the end of the case 35, a connector 39 for outputting the detection signal detected by each current detection means 38 to the power measuring unit 33 is disposed.

  The power measuring unit 33 is mounted on the mounting plate 20 along with the plurality of branch breakers 14 on the lower side of the conductive bar 13, and is electrically connected to the conductive bar 13 in the same manner as the branch breaker 14. It is configured to operate upon supply. From the power measuring unit 33, a pair of cables (not shown) having a connector electrically connected to the connector 39 of each sensor unit 32 is derived.

  As shown in FIG. 3, the power measuring unit 33 is a voltage detecting unit 41 that detects a voltage from the conductive bar 13, a voltage detecting unit 41, and a calculation unit that obtains detection signals from the current detecting units 38 and calculates power. 42, and an output unit 43 that outputs the calculation result of the calculation unit 42 to a device such as a home gateway installed outside the distribution board 10.

  FIG. 1 shows a schematic diagram of current detection by the power measurement unit 15.

  In the figure, R100 indicates a 100V load, and R200 indicates a 200V load. Although AC power is supplied to these loads R100 and R200 through the branch breaker 14, the branch breaker 14 is not shown.

  The single-phase three-wire AC power supply has a neutral pole N and a pair of voltage poles L1 and L2. Between the voltage pole L1 and the neutral pole N and between the neutral pole N and the voltage pole L2 100V, and the voltage between the voltage electrode L1 and the voltage electrode L2 is 200V.

  When a 100V load R100 is connected to the branch breaker 14, the upper branch breaker 14 is connected to the voltage pole L1 and the neutral pole N, and the lower branch breaker 14 is connected to the neutral pole N and the voltage pole. 100V AC power is connected to L2 and supplied to the load R100.

  When a 200V load R200 is connected to the branch breaker 14, the branch breaker 14 is connected to the voltage electrode L1 and the voltage electrode L2, and 200V AC power is supplied to the load R200.

  In the branch breaker 14 to which the 100V load R100 is connected, the current detection means 38 is installed at the wiring location on the voltage electrode L1, L2 side with respect to the load R100. That is, in the upper branch breaker 14 to which the 100V load R100 is connected, the current detection means 38 is installed at the wiring location between the load R100 and the voltage electrode L1, and the 100V load R100 is connected. In the lower branch breaker 14, a current detection means 38 is installed at a wiring location between the load R100 and the voltage electrode L2.

  In the branch breaker 14 connected to the 200V load R200, the current detection means 38 is installed at the wiring location between the load R200 and the voltage electrode L2.

  The installation of each current detection means 38 depends on the location of the branch breaker 14 and the voltage of the load among the pair of electric wires 26 connected to the branch breaker 14 so as to be installed at the wiring location determined as described above. One of the predetermined electric wires 26 is inserted into the insertion hole 36 of the sensor portion 32, that is, the current detection means 38. That is, of the pair of electric wires 26 connected to the upper branch breaker 14 for the load R100 of 100V, one electric wire 26 connected to the voltage pole L1 side passes through the current detection means 38 and then to the branch breaker 14. Connected. Of the pair of electric wires 26 connected to the lower branch breaker 14 for the load R100 of 100V, one electric wire 26 connected to the voltage electrode L2 side is connected to the branch breaker 14 after passing through the current detection means 38. The Of the pair of electric wires 26 for the 200V load R200, one electric wire 26 connected to the voltage electrode L2 side is connected to the branch breaker 14 after passing through the current detecting means 38.

  Thus, according to each of the upper branch breaker 14 to which the 100V load R100 is connected, the lower branch breaker 14 to which the 100V load R100 is connected, and the branch breaker 14 to which the 200V load R200 is connected. The current detection means 38 is installed at a predetermined wiring location.

  By installing the current detection means 38 at a predetermined wiring location, a 100V load R100 and a 200V load R200 with respect to the phase of the voltage detected by the voltage detection means 41, as shown in FIG. Thus, the phase of the current detected by the current detection means 38 is reversed. That is, the phase of the current of the 100V load R100 detected by the current detection unit 38 is in the same direction with respect to the phase of the voltage detected by the voltage detection unit 41, and the phase of 200V detected by the current detection unit 38 The phase of the current of the load R200 is reversed.

  Then, the calculation unit 42 includes information on the phase of the current of the 100V load R100 and the phase of the current of the 200V load R200 detected by the current detection unit 38 with respect to the phase of the voltage detected by the voltage detection unit 41, current detection unit Information such as whether 38 detects the current flowing through the load connected to the upper branch breaker 14 or the current flowing through the load connected to the lower branch breaker 14 is stored in advance. Therefore, the load voltage can be determined from the phase of the voltage detected by the voltage detection means 41 and the phase of the current detected by the current detection means 38, and the power can be calculated based on the determined load voltage.

  Next, the power measurement operation by the power measurement unit 15 will be described.

  For example, when power is used in a 100V load R100 connected to the upper branch breaker 14, the current flowing through the load R100 is detected by the current detection means 38 installed on the voltage pole L1 side with respect to the load R100. Then, the detected detection signal is input to the calculation unit 42. Then, since it is known that the calculation unit 42 is a detection signal from the current detection means 38 that detects the current flowing through the load connected to the branch breaker 14 on the upper stage side, as shown in FIG. If the phase of the detection signal from the current detection means 38 is in the same direction with respect to the phase of the voltage detected by the means 41, it is determined that the load is R100 of 100V, and power is supplied at a voltage of 100V. Calculate.

  Further, when power is used with a 100V load R100 connected to the lower branch breaker 14, the current flowing through the load R100 is detected by the current detection means 38 installed on the voltage electrode L2 side with respect to the load R100. Then, the detected detection signal is input to the calculation unit 42. In this case, the phase of the current between the neutral electrode N and the voltage electrode L2 is opposite to the phase of the current between the voltage electrode L1 and the neutral electrode N. Since the current detection means 38 is installed on the L2 side, the phase of the current detected by the current detection means 38 is installed on the voltage pole L1 side with respect to the load R100 connected to the upper branch breaker 14. The phase in the same direction as the phase of the current detected by the current detection means 38 is obtained. Since it is known that the calculation unit 42 is a detection signal from the current detection means 38 that detects the current flowing in the load connected to the lower branch breaker 14, the voltage detection is performed as shown in FIG. If the phase of the detection signal from the current detection means 38 is in the same direction with respect to the phase of the voltage detected by the means 41, it is determined that the load is R100 of 100V, and power is supplied at a voltage of 100V. Calculate.

  Further, when power is used with a 200V load R200 connected to the branch breaker 14, the current flowing through the load R200 is detected and detected by the current detection means 38 installed on the voltage pole L2 side with respect to the load R200. The detected signal is input to the calculation unit 42. Then, since the calculation unit 42 is known to be a detection signal from the current detection means 38 that detects the current flowing through the load connected to the branch breaker 14 on the upper stage side or the lower stage side, as shown in FIG. If the phase of the detection signal from the current detection unit 38 is opposite to the phase of the voltage detected by the voltage detection unit 41, it is determined that the load R200 is 200V, and power is supplied at a voltage of 200V. Calculate.

  In this way, in the power measurement unit 15, the current detection unit 38 is set so that the phase of the current detected by the 100 V load and the 200 V load is opposite to the phase of the voltage detected by the voltage detection unit 41. The calculation unit 42 holds in advance information on the phase of the current of the 100V load R100 and the phase of the current of the 200V load R200 detected by the current detection means 38 with respect to the voltage phase detected by the voltage detection means 41. Thus, the calculation unit 42 automatically determines the load voltage from the phase of the voltage detected by the voltage detection means 41 and the phase of the current detected by the current detection means 38, and determines the load of the determined load. Power can be calculated based on voltage. Therefore, the setting work of the voltage of the load connected to the branch breaker 14 becomes unnecessary, and there is no setting mistake and accurate power measurement can be performed.

  Although FIG. 2 shows the case where the phase of the voltage and the phase of the current are the same, even if the phase is slightly shifted due to the influence of the load circuit, the calculation unit 42 can determine the voltage of the load.

  Further, the phase of the current of the 100V load R100 detected by the current detection means 38 is opposite to the phase of the voltage detected by the voltage detection means 41, and the 200V load R200 detected by the current detection means 38. The phases of the currents may be in the same direction. In this case, in the branch breaker 14 on the upper stage side to which the 100V load R100 is connected, the current detection means 38 is installed at the wiring location between the load R100 and the neutral electrode N, and the 100V load R100 is connected. In the lower branch breaker 14, the current detection means 38 is installed at the wiring location between the load R100 and the neutral electrode N, and in the branch breaker 14 connected to the 200V load R200, What is necessary is just to install the electric current detection means 38 in the wiring place between R200 and the voltage pole L1.

  Further, when CT is used for the current detection means 38, there is a direction in which the direction of the current is detected by the CT detection coil, so that a load of 100V and a load of 200V with respect to the phase of the voltage detected by the voltage detection means 41 The direction in which the direction of the current is detected by the CT detection coil may be changed so that the phase of the current detected in step 1 is reversed.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

10 Distribution board
13 Conductive bar
14 Branch breaker
15 Power measurement unit
38 Current detection means
41 Voltage detection means
42 Calculation unit

Claims (2)

Voltage detecting means for detecting voltage from a conductive bar that supplies single-phase three-wire AC power;
The current flowing from the branch breaker connected to the conductive bar to the load side is detected, and the phase of the current detected by the 100 V load and the 200 V load is opposite to the phase of the voltage detected by the voltage detecting means. Current detection means installed to be;
Information on the phase of the 100V load current detected by the current detection means and the phase of the 200V load current detected by the current detection means with respect to the phase of the voltage detected by the voltage detection means is stored in advance, and the voltage detected by the voltage detection means A calculation unit that determines the voltage of the load from the phase of the current and the phase of the current detected by the current detection means, and calculates power based on the determined voltage of the load;
An electric power measurement unit comprising: A conductive bar for supplying AC power in a single-phase three-wire system;
A plurality of branch breakers connected to the conductive bar so as to be connected according to the voltage on the load side;
A power measuring unit according to claim 1;
A distribution board characterized by comprising:

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