JP2014153296A - Remote meter-reading device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a remote meter-reading device capable of easily detecting that a cover has been opened by mischief or the like.SOLUTION: A measurement part for measuring electric energy supplied from a power undertaker via a power transmission network, and consumed by a client side and a communication part for transmitting the measurement result of the measurement part to the outside are stored in a case 10. Terminals 2a to 2c and 3a to 3c are disposed outside the case 10. The terminals 2a to 2c are used for connecting a primary side power line to the measurement part, and the terminals 3a to 3c are used for connecting a secondary side power line to the measurement part. A terminal cover 20 for covering the terminals 2a to 2c and 3a to 3c is attached to the case 10. A detection switch 9a detects whether or not the terminal cover 20 is attached to the case 10. The case 10 is configured such that a body 30 is combined with a cover 40. A screw 50 with which the body 30 is connected to the cover 40 in a combined state is disposed in a region covered by the terminal cover 20.

Description

  The present invention relates to a remote meter reading device.

  Conventionally, there has been a remote meter-reading device that measures the amount of electric power used by a consumer and transmits the measured value to the outside by communication (for example, see Patent Document 1). In the remote meter-reading apparatus of patent document 1, the measurement element for measuring electric energy, the measurement part which integrates the electric energy measured by the measurement element, the display part which displays the integration result of a measurement part, and the integration result A communication control unit that communicates to the outside by communication is housed inside the watt-hour meter. The outer shell of the watt-hour meter is composed of a base, a glass cover, a terminal box, and a terminal cover. A measurement element, a weighing unit, a display unit, and a communication control unit are attached to the base. The terminal box is provided with an input terminal for taking in a signal to be measured from the outside and a communication terminal for outputting a measurement signal. After checking the weighing accuracy of the weighing unit at a certification body, etc., the measuring element, weighing unit, display unit and communication control unit are covered with a glass cover and sealed so that the weighing unit cannot be touched from the outside. Yes. In addition, a terminal cover that covers the input terminal and the communication terminal is attached to the terminal box.

JP 2002-8174 A

  In the above remote meter reading device, since the meter reading is performed, the opportunity for the meter reader to go to the installation site of the measuring device is reduced, and even if the glass cover or terminal cover is removed due to fraud or mischief, the meter meter will notice There was a possibility that it was left behind as it was.

  The present invention has been made in view of the above problems, and an object thereof is to provide a remote meter-reading device that can easily detect that a cover has been opened due to mischief or the like.

  The remote meter-reading apparatus of this invention is provided with a measurement part, a communication part, a case, a terminal, a terminal cover, and a detection part. The metering unit measures the amount of power that is supplied through the power transmission network from a power provider that supplies power to the customer through the power transmission network and consumed by the consumer. The communication unit transmits the measurement result of the measurement unit to the outside. The case accommodates at least the measuring unit inside. The terminal is arranged in a state of being exposed to the outside of the case, and is used for connecting the primary and secondary power lines to the measuring unit. The terminal cover is attached to the case so as to cover the terminal. The detection unit detects whether the terminal cover is attached to the case. The case is configured by combining a plurality of members. A coupling member for coupling members in a state where a plurality of members are combined is provided in an area covered by the terminal cover.

  In order to open the case by mischief or the like, it is necessary to remove the coupling member. However, since the coupling member is disposed in an area covered with the terminal cover, it is necessary to first remove the terminal cover from the case. When the terminal cover is removed, the detection unit can detect that the terminal cover has been removed. Based on the detection result of the detection unit, the terminal cover has been removed, or the terminal cover has been removed and the case has been removed. Both can be detected. Therefore, when the case is opened due to mischief or the like, it is possible to avoid a situation where the case is left without noticing that the case has been opened. In addition, it is possible to detect that either one or both of the region covered with the terminal cover and the internal region of the case are exposed with only one detection unit. Therefore, it is not necessary to provide a means for detecting whether or not the case is opened separately from the detection unit for detecting whether or not the terminal cover is attached to the case, and the cost can be reduced.

The remote meter-reading apparatus of this embodiment is shown, (a) is a front view, (b) is a right side view, (c) is a sectional view seen from the right side, and (d) is a bottom view. The measuring unit which comprises the remote meter-reading apparatus same as the above is shown, (a) is a front view, (b) is a right side view, (c) is a bottom view. The state which connected the power line to the remote meter-reading apparatus same as the above is shown, (a) is the front view which abbreviate | omitted partly, (b) is the BB sectional drawing which abbreviate | omitted partly. It is a block diagram of the remote meter-reading apparatus same as the above.

  Hereinafter, an embodiment of a remote meter reading device according to the present invention will be described with reference to the drawings.

  The remote meter-reading apparatus of this embodiment is installed in the consumer who receives supply of electric power from an electric power provider through a power transmission network, is used for measuring the electric energy consumed by the consumer, and transmitting the measurement result to the outside. .

  FIG. 4 is a block diagram of the remote meter reading device 1. The remote meter reading device 1 includes terminal units 2 and 3, a current / voltage measuring unit 4, a measuring unit 5, a display unit 6, a communication unit 7, an opening / closing unit 8, and a detection unit 9.

  The terminal unit 2 is a primary side terminal to which the power line 100 from the power transmission network is connected. The distribution form from the power transmission network to the customer is a single-phase three-wire system. The power line 100 is composed of three electric wires 102 of the L1 phase, the L2 phase, and the neutral phase, and the terminal portion 2 has a three-pole terminal. (See FIG. 3 (a)).

  The terminal unit 3 is a secondary side terminal to which the power line 101 to the customer side is connected. Similarly to the power line 100, the power line 101 includes three electric wires 102 of the L1 phase, the L2 phase, and the neutral phase, and the terminal portion 3 includes a three-pole terminal (see FIG. 3A).

  The current / voltage measuring unit 4 measures an input current input from the terminal unit 2 using, for example, a current transformer (not shown). The current / voltage measuring unit 4 obtains, for example, a voltage between the L1 phase and the neutral phase and a voltage between the L2 phase and the neutral phase by dividing the voltage between the L1 phase and the neutral phase with a voltage dividing resistor (not shown). Measure the input voltage between each phase based on the measured voltage.

  The measuring unit 5 measures the amount of electric power supplied from the power company and consumed by the consumer based on the input current and the input voltage measured by the current / voltage measuring unit 4.

  The display unit 6 includes a liquid crystal display, for example, and displays the amount of power obtained by the measuring unit 5 and the like.

  The communication unit 7 communicates with an external device (for example, a management device of a power provider or a HAN (Home Area Network) controller in a consumer) via a power line 100 connected to the terminal unit 2 by a power line communication method. Communicate. For example, the communication unit 7 transmits the amount of power obtained by the weighing unit 5 to an external device through power line carrier communication. As a transmission method for power line communication, for example, there are transmission methods such as HD-PLC, G3-PLC, and PRIME. Further, the communication method of the communication unit 7 is not limited to the power line carrier communication method, and short-range wireless such as ZigBee or wireless communication using a mobile phone network such as 3G may be used.

  The opening / closing part 8 is composed of a relay connected in the middle of the internal wiring connecting the terminal part 2 and the terminal part 3, and when a shut-off command is input from the communication part 7, the relay is turned off and the customer side Shut off the power supply to For example, when a certain customer has been behind with electricity for a long period of time, or when an unauthorized use of electric power is discovered at a certain customer, an interruption command is transmitted to the remote meter reading device 1 from the management device of the electric power company. When the communication unit 7 receives the cutoff command transmitted from the management device, the switching unit 8 turns off the relay, and the power supply to the customer side is cut off.

  The detection unit 9 detects whether or not a terminal cover 20 described later is attached to the case 10.

  Next, the structure of the remote meter reading device 1 will be described with reference to FIGS. In the following description, the vertical and horizontal directions are defined with reference to the orientation shown in FIG. 1A, and the left side in FIG. This direction is defined for convenience of explanation, and the actual mounting direction is not limited to the above direction.

  As shown in FIG. 1, the outer shell of the remote meter reading device 1 includes a case 10 and a terminal cover 20.

  The case 10 is formed in a horizontally long rectangular parallelepiped shape by combining the rear body 30 and the front cover 40.

  Each of the body 30 and the cover 40 is made of a synthetic resin molded product, and is formed in a shape that divides the case 10 into two in the front-rear direction. On the rear end edges of the upper, lower, left and right side plates provided in the cover 40, step portions 41 are provided on the inner surfaces of the corresponding side plates of the body 30 from the inside. A through hole (not shown) is provided in the step portion 41 of the upper plate of the cover 40, and a protrusion 31 that fits into the through hole is provided on the upper plate of the body 30. Further, the lower side plate of the body 30 is partially provided with a screw base 32 positioned above the step portion 41, and the lower side plate of the cover 40 has a surface of the screw base 32. A strip-shaped plate piece 42 that is in contact with the (lower surface) from the outside is integrally provided. A screw hole is provided in the screw receiving base 32, and a hole through which a screw for screwing into the screw hole is provided in the plate piece.

  When the case 10 is assembled, the operator first fits the protrusion 31 of the body 30 into the hole provided in the step 41 of the cover 40, butts the opening of the body 30 and the cover 40, The part 41 is brought into contact with the inner surface of the side plate of the body 30 from the inside. At this time, the plate piece 42 of the cover 42 enters the recess 33 on the lower side of the screw receiving table 32, and the plate piece 42 comes into contact with the surface (lower surface) of the screw receiving table 32. In this state, the operator screwes the screw 50 passed through the hole of the plate piece 42 into the screw hole provided in the screw receiving base 32, and couples the body 30 and the cover 40. Here, in this embodiment, the screw 50 constitutes a coupling member that couples a plurality of members constituting the case 10 (in this embodiment, the body 30 and the cover 40). The coupling member is not limited to a screw, and an appropriate coupling member such as a rivet may be used.

  Inside the case 10 are two circuit boards 60 on which an electric circuit including a current / voltage measuring unit 4, a measuring unit 5, a display unit 6, a communication unit 7, an opening / closing unit 8 and a detection unit 9 is formed. 61 is stored. A panel portion of the display unit 6 is disposed on the front surface of the case 10 (that is, the front surface of the cover 40).

  As shown in FIGS. 2 and 3, on the lower surface of the body 30, a plate-shaped terminal block 11 having a thickness dimension in the front-rear direction that is thinner than the body 30 and whose front surface is located behind the case 10 protrudes downward. Is provided. The body 30 formed separately from the terminal block 11 may be fixed to the terminal block 11, or the terminal block 11 and the body 30 may be integrally formed.

  Six holes 12 are provided in the front surface of the terminal block 11 side by side in the left-right direction. A lower portion of each hole 12 is connected to a hole 13 formed upward from the lower surface of the terminal block 11. A terminal plate 14 is disposed on the rear end face of each hole 12. In the terminal plate 14, two screw holes 14 a are formed side by side at a portion corresponding to the hole 13 for inserting an electric wire, and a terminal screw 15 is screwed into each screw hole 14 a. When the installer peels off the insulation coating at the tip of the electric wire 102 to expose the core wire 103 and inserts the exposed core wire 103 into the hole 13, and then screws the terminal screw 15, the core wire 103 of the electric wire 102 is connected to the terminal screw 15. And the core wire 103 is electrically connected to the terminal plate 14. Here, the terminal plate 14 and the two terminal screws 15 arranged in each hole 12 constitute a screw terminal. As shown in FIG. 2 (a), the three sets of screw terminals on the left side are three-pole terminals 2a, 2b, and 2c that constitute the primary side terminal portion 2, and the three sets of screw terminals on the right side are secondary It becomes the three-pole terminals 3a, 3b, 3c constituting the terminal part 3 on the side. These terminals 2 a to 2 c and 3 a to 3 c are arranged in a state of being exposed to the outside of the case 10.

  The terminal cover 20 is made of a synthetic resin molded product. The terminal cover 20 includes a front plate 20a formed such that the lower side of the rectangular plate is bent obliquely rearward, a pair of side plates 20b protruding from the left and right side edges of the front plate 20a, respectively, A bottom plate 20c that projects rearward from the lower edge of the plate 20a is integrally provided. The bottom plate 20c is provided with a groove 20d for introducing the power lines 100 and 101 from the outside. The front plate 20a of the terminal cover 20 is provided with through holes 21 through which screws (not shown) for fixing the terminal cover 20 to the case 10 are inserted. A counterbore 21a is provided around the through hole 21 to receive a screw head. The terminal block 11 is provided with a hole 16 at a position facing the through hole 21 (position overlapping the through hole 21 when viewed from the front), and a nut (not shown) is disposed on the rear side of the hole 16. . Thus, after the installer covers the terminal cover 20 over the terminal block 11 so as to cover the terminal portions 2 and 3, a screw is passed through the through hole 21 and the hole 16, and this screw is inserted into the rear side of the hole 16. Then, the terminal cover 20 is coupled to the case 10 with screws. After fixing the terminal cover 20 to the case 10 with screws, the installer performs sealing by attaching a tape or the like to the counterbore 21a so that the terminal cover 20 is not removed due to mischief or the like. As shown in FIG. 1, when the terminal cover 20 is attached to the case 10, screws 50 for connecting the body 30 and the cover 40 are covered with the terminal cover 20.

  In addition, a protrusion 20 e that protrudes rearward and contacts the lower side surface of the case 10 is provided at the upper end portion of the front plate 20 a of the terminal cover 20. On the lower side surface of the case 10, a hole 43 is formed at a portion overlapping the protrusion 20e. Inside the case 10 is housed a push-button type detection switch 9 a that constitutes the detection unit 9 described above, and the push button 9 b of the detection switch 9 a protrudes to the outside through the hole 43. In a state where the terminal cover 20 is attached to the case 10, the internal contact of the detection switch 9a is switched to an on state, for example, by pressing the push button 9b with the protrusion 20e. On the other hand, when the terminal cover 20 is removed from the case 10, the push button 9b is not pushed by the protrusion 20e, so that the internal contact of the detection switch 9a is switched to, for example, an off state.

  Thus, depending on whether or not the terminal cover 20 is attached to the case 10, the on / off of the internal contact of the detection switch 9a is switched. The measuring unit 5 monitors the contact signal of the detection switch 9a, and determines whether the terminal cover 20 is attached to the case 10 based on the contact signal of the detection switch 9a. When the measuring unit 5 determines that the terminal cover 20 has been removed based on the contact signal of the detection switch 9a, the measuring unit 5 sends a notification signal for notifying that the terminal cover 20 has been removed from the communication unit 7 together with the identification information of its own device. Send to the management device of the operator. Upon receiving the notification signal and the identification information from the remote meter reading device 1, the power company management device receives information (for example, the name of the customer, the installation location, etc.) that identifies the transmission source meter reading device 1 and the terminal cover 20 Display on the monitor that it was removed. Therefore, the manager of the electric power company can confirm the status of the terminal cover 20 being removed and the information of the remote meter reading device 1 from which the terminal cover 20 has been removed from the contents displayed on the monitor of the management device. it can.

  As described above, the remote meter-reading device 1 of the present embodiment includes the measuring unit 5, the communication unit 7, the case 10, the terminals 2a to 2c, 3a to 3c, the terminal cover 20, and the detection unit 9. Prepare. The metering unit 5 measures the amount of power that is supplied through the power transmission network from a power company that supplies power to the customer through the power transmission network and is consumed by the consumer. The communication unit 7 transmits the measurement result of the measuring unit 5 to the outside. The case 10 houses at least the measuring unit 5 therein. The terminals 2 a to 2 c and 3 a to 3 c are arranged in a state exposed to the outside of the case 10. The terminal cover 20 is attached to the case 10 so as to cover the terminals 2a to 2c and 3a to 3c. The detection unit 9 detects whether or not the terminal cover 20 is attached to the case 10. The case 10 is configured by combining a plurality of members (in this embodiment, the body 30 and the cover 40). A coupling member (screw 50) for coupling the members in a state where a plurality of members are combined is provided in an area covered by the terminal cover 20.

  By the way, in order to open the case 10 by mischief or the like, it is necessary to remove the coupling member. However, since the coupling member is arranged in an area covered with the terminal cover, it is necessary to first remove the terminal cover 20 from the case 10. . When the terminal cover 20 is removed, the detection unit 9 can detect that the terminal cover 20 has been removed. Therefore, based on the detection result of the detection unit 9, the terminal cover 20 is removed, or the terminal cover It can be detected that any one of the states in which 20 is removed and the case 10 is opened. Therefore, when the case 10 is opened due to mischief or the like, it is possible to avoid a situation where the case 10 is left without being noticed that the case 10 has been opened. In addition, it is possible to detect that either one or both of the region covered with the terminal cover 20 and the internal region of the case 10 are exposed with only one detection unit 9. Therefore, it is not necessary to provide a means for detecting whether or not the case 10 has been opened separately from the detection unit for detecting whether or not the terminal cover 20 has been removed, and the cost can be reduced.

DESCRIPTION OF SYMBOLS 1 Remote meter-reading apparatus 2 Terminal part 2a-2c terminal 3 Terminal part 3a-3c terminal 5 Weighing part 7 Communication part 9 Detection part 9a Detection switch 9b Pushbutton 10 Case 20 Terminal cover 20e Protrusion 30 Body (member)
40 Cover (member)
50 Screw (joint member)
100, 101 power line

Claims (1)

A measuring unit for measuring the amount of power supplied through the power grid and consumed by the consumer from a power provider that supplies power to the customer through the power grid;
A communication unit for transmitting the measurement result of the measurement unit to the outside;
A case for storing at least the measuring unit therein;
A terminal which is arranged in an exposed state on the outside of the case, and is used to connect the power line on the primary side and the secondary side to the measuring unit;
A terminal cover that is attached to the case so as to cover the terminal, and a detection unit that detects whether or not the terminal cover is attached to the case,
The case is configured by combining a plurality of members,
A remote meter-reading device, wherein a coupling member for coupling the members in a state where a plurality of the members are combined is provided in an area covered by the terminal cover.

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