JPH0337143B2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains]

The present invention relates to a terminal device for a watt-hour meter that interconnects the watt-hour meter and power supply side and load side wiring.

[Prior art and its problems]

A watt-hour meter is installed between the power supply side wiring drawn from the distribution line and the load-side wiring of the power consumer to measure the amount of power supplied to the load side. In some cases, electricity meters may be temporarily removed for periodic replacement or inspection and repair at the location. However, in conventional watt-hour meters, a terminal block is built into the watt-hour meter body that directly connects the power supply side wiring and load-side wiring, so when simply removing the watt-hour meter, the power supply side Since the interconnection between the wiring and the load-side wiring is disconnected, the load side will experience a power outage, even if only temporarily, which will disrupt the lives of ordinary household customers, and further disrupt business operations for customers such as companies. This may lead to undesirable situations such as being forced to completely stop the operation. In addition, by making a bypass connection between the power supply side wiring and the load side wiring in advance using temporary auxiliary wiring when removing the watt-hour meter,
It is possible to replace the watt-hour meter without causing a power outage on the load side, but in this case, you will be forced to work with dangerous live wires, which poses work safety issues such as the risk of electric shock. .

[Purpose of the invention]

This invention has been made in consideration of the above points, and solves the above-mentioned problems, and eliminates the need for a power outage to the load on the consumer side when replacing a watt-hour meter.
Another object of the present invention is to provide a terminal device for a watt-hour meter configured so that the watt-hour meter can be replaced safely and easily without the risk of electric shock.

[Key points of the invention]

In order to achieve the above object, the present invention has a terminal block interposed between the main body of a watthour meter and external wiring and detachably coupled to the main body, and the terminal block is an insulated terminal block. and a first fixed terminal metal row arranged side by side on the surface of the terminal block facing the main body and removably connected to the pull-out terminal on the main body side, and a first fixed terminal metal row facing the first fixed terminal metal row. a second fixed terminal metal row arranged in parallel on the opposite side of the terminal block and connected to the power supply and load side wiring, and the first
and a fixed terminal fitting corresponding to the current circuit on the main body side in the second fixed terminal fitting row, and in the "metering" position, the fixed terminal fitting corresponds to the first and second fixed terminal fitting row. By connecting the matching terminal fittings for continuity and rotating them from the "Measuring" position to the "Replacement" position, the current-carrying path leading to the current circuit on the main body side is cut off, and at the same time, the power supply side wiring and the load side wiring are connected. It is equipped with a drum-shaped switching switch that short-circuits between When measuring the power consumption on the load side by forming an energizing path leading to the current and voltage circuits of By rotating it to the "replacement" position, the current circuit leading to the current circuit on the main body side is cut off, and at the same time, the power supply side wiring and the load side wiring are short-circuited to bypass the current circuit on the watt-hour meter main body side. The structure is such that work such as replacing the main body of the watt-hour meter can be performed without power outage on the load side.

Embodiments of the Invention FIG. 1 is a perspective view of the configuration of a terminal device according to an embodiment of the invention, FIG. 2 is a configuration diagram of a drum type switching switch, and FIGS. FIGS. 4 and 5, which are diagrams showing the switching operation of the type switching switch, respectively show a circuit diagram of the watt-hour meter in use and a state in which the watt-hour meter main body and the terminal device are separated. First, in Figure 1, 1 is the main body of the electricity meter, 2
are terminal blocks 3a and 3b constituting the terminal device;
4a and 4b show the power supply side wiring, and 4a and 4b show the load side wiring.
Here, the power meter main body 1 has a current element 1a, a voltage element 1b, and a power integration and display mechanism (not shown) built in its main body case.
Further, on the lower surface side of the main body case, lead-out terminals 5a to 5c, which serve as pin terminals drawn out from each of the above-mentioned elements, are arranged side by side. On the other hand, the terminal block 2 includes an insulating terminal block 2a made of a resin molded product, and a lead-out terminal 5 on the main body side.
A first fixed terminal metal row consisting of fixed terminal metal fittings 6a to 6c arranged on the upper side of the terminal block 2a facing the terminal blocks 2a to 5c; A second fixed terminal metal row consisting of fixed terminal metal fittings 7a to 7c arranged on the lower side and connected to the power supply side wirings 3a, 3b and the load side wirings 4a, 4b, and the first and second fixed terminal metal fittings. Fixed terminal fittings 6a, 6b and 7 in the row
It is an assembly with a drum type switching switch 8 which is interposed between terminal blocks 2a and 7b and fitted into an opening hole of the terminal block 2a. Reference numeral 9 denotes a tightening screw for fastening the lead-out terminal on the main body side and the external wiring on the power source and load side, which are inserted into each of the above-mentioned fixed terminal fittings. In addition, 6c and 7c of the fixed terminal metal fittings mentioned above.
It is a terminal fitting with an integral structure. The detailed structure of the drum type switching switch 8 described above is shown in FIG. 2. That is, the switching switch 8 is a drum body 81 made of an insulating material.
and half-doughnut-shaped sliding contact members 82 and 83 mounted on the front and rear of the circumference of the drum body 81 with a phase shift of 180 degrees from each other. A groove 84 is opened for inserting a tool to rotate the drum body 81. Further, on the circumferential surface of the drum body 81, notching grooves 85 and 86 are opened at predetermined positions at different positions, and a notching pin with a biasing spring is disposed on the terminal block side facing the notching grooves. It is equipped with a notching mechanism consisting of 87. Note that 88 is a mark engraved on the periphery of the drum body 81 to indicate the operating position, and the "Measure" mark indicated on the terminal block 2a side shown in FIG.
Perform the switching operation of the switching switch according to the "replacement" mark position as described later. Furthermore, the fixed terminal fittings 6a, 7a and the wide terminal fitting 7b are opposed to the circumferential surface of the sliding contact member 82 of the switching switch, and the fixed terminal fitting 6b is opposed to the circumferential surface of the sliding contact member 83. The wide terminal fittings 7b are located thereon, and a sliding contact 10 is attached to the tip of each fixed terminal fitting to make contact with the contact members 82, 83 on the switch side. Next, the operation of the switching switch described above will be explained. That is, as shown in Fig. 3a and b, the switch 8
is in the "measuring" position, between the fixed terminal fittings 6b and 7b via the contact members 82 and 83, and between the fixed terminal fittings 6b and 7.
A conductive state is established between the two terminals and b. In response, rotate the switch 8 in the direction of arrow P to move the drum body 81 from the above-mentioned "weighing" position to the "replacement" position.
When the contact member 82 rotates towards the position, at an intermediate position in the rotation process, the contact member 82 contacts the terminal fittings 6a, 7a, 7b.
At the "replacement" position, it is disconnected from the terminal fitting 6a and short-circuited between the terminal fittings 7a and 7b. On the other hand, when the contact member 83 rotates from the "measuring" position to the "replacement" position, the terminal metal fitting 6a, which had been electrically connected,
and 7b are now disconnected. Next, the usage state of the watt-hour meter with the above configuration and the operation when replacing the watt-hour meter will be explained. First, in the operating state of the electricity meter in which the main body 1 is connected to the terminal block 2, as shown in FIG.
.about.6c, and the drum-type switching switch 8 is set in the "weighing" position shown in FIG. Therefore, a current-conducting path is formed between the power supply side wiring 3a, 3b and the load side wiring 4a, 4b, passing through the terminal block 2 and the main body 1's current and voltage elements 1a, 1b, and in this state, the current is passed to the load side. The amount of power supplied is measured by the main body 1. On the other hand, when disconnecting the watt-hour meter from the external wiring for periodic replacement of the watt-hour meter, inspection and repair, etc., first manually operate the drum-type switching switch 8 to remove the drum body 81 as shown in FIG. Rotate from the "weighing" position to the "replacement" position. As a result, the positions of the contact members 82 and 83 of the switch 8 are switched, and at the same time, as shown in FIG. A short circuit is formed that bypasses the main body 1 by shorting between the power supply side wiring 3a and the load side wiring 4a without interrupting the power supply to the load side. Next, tighten screws 9 of the fixed terminal fittings 6a to 6c that fasten the drawer terminals 5a to 5c on the main body side.
By loosening, the connection between the main body 1 of the watthour meter and the terminal block 2 can be broken, and the main body 1 can be removed while continuing power supply to the load side. Note that in order to connect a separately prepared main body to the terminal block 2 in place of the watt-hour meter main body removed in the above operation, reverse the procedure of the above-described removal operation and connect the corresponding lead-out terminals 5a to 5c on the main body side. Connect the terminal block 2 and main body 1 by inserting it into the fixed terminal fittings 6a to 6c on the terminal block side, then tighten the screws 9 to firmly fix the pull-out terminal to the fixed terminal fittings on the terminal block side, and then attach the terminal block to the fixed terminal fittings 6a to 6c on the terminal block side. The switching operation is performed by rotating the shape switching switch 8 in the direction of arrow Q from the "exchange" position shown in FIG. 3 to the "measurement" position. As a result, the watt-hour meter returns to the operating state shown in FIG. 4, and begins to measure the amount of power consumed on the load side. As is clear from the explanation of the above embodiment, when the main body 1 of the watt-hour meter is removed from the terminal block 2 during periodic replacement, inspection and repair, etc. of the watt-hour meter, the power supply to the load side is maintained. The main body 1 and the terminal block 2 can be separated. Moreover, in this removal operation process, there is no need to connect auxiliary wiring using dangerous live wire work as described above, and there is no need to switch the drum-type switching switch and connect the lead-out terminal on the main body side and the terminals that connect to it. The power meter replacement work can be carried out safely and quickly by simply attaching and detaching the fixed terminal fittings on the block side. In the drum type switching switch 8, the contact members 82, 83 and the contact 10 attached to the mating fixed terminal fitting slide and rub against each other each time the switch is rotated, so that the surface of the contact member The dust, oxide film, etc. that adhere to or generate on the surface are removed and cleaned, making it possible to maintain a highly contactable and energized state. The illustrated embodiment is an example of a watt-hour meter used in a single-phase, two-wire power distribution circuit.
It goes without saying that the present invention can be similarly applied to single-phase three-wire, three-phase three-wire, three-phase four-wire, and other watthour meters.

【Effect of the invention】

As described above, according to the present invention, there is provided a terminal block that is interposed between the main body of the watthour meter and the external wiring and is removably connected to the main body, and the terminal block is an insulated terminal block. and a first fixed terminal metal row arranged side by side on the surface of the terminal block facing the main body and removably connected to the pull-out terminal on the main body side, and a first fixed terminal metal row facing the first fixed terminal metal row. a second fixed terminal metal row arranged in parallel on the opposite side of the terminal block and connected to the power supply and load side wiring, and the first
and a fixed terminal fitting corresponding to the current circuit on the main body side in the second fixed terminal fitting row, and in the "metering" position, the fixed terminal fitting corresponds to the first and second fixed terminal fitting row. By connecting the matching terminal fittings for continuity and rotating them from the "Measuring" position to the "Replacement" position, the current-carrying path leading to the current circuit on the main body side is cut off, and at the same time, the power supply side wiring and the load side wiring are connected. By configuring the terminal device of the watt-hour meter with a drum-shaped switching switch that short-circuits between Moreover, the switching switch is installed at a predetermined part of the peripheral surface of the main body made of an insulating material. Connected to a fixed terminal fitting that corresponds to the current circuit,
It consists of a sliding contact that is constantly in contact with the circumferential surface of the drum body and moves on the circumferential surface when the drum body rotates, and is used to control each movement of the drum body in the "weighing" position and the "replacement" position. By installing a notching mechanism that regulates the position, the drum body can be reliably rotated to the "weighing" position and the "replacement" position and the position can be regulated, allowing for safe and reliable watt-hour meter replacement work. The replacement work efficiency can be improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the configuration of a terminal device according to an embodiment of the present invention showing a separated state from the power meter main body, FIG. 2 is a structural diagram of the drum type switching switch in FIG. 1, and FIGS. b is a configuration diagram of the switching operation of the drum-type switching switch shown in FIG. 2, and FIGS. 4 and 5 are connection circuit diagrams of the watt-hour meter in a usage state and a disconnected state, respectively. In the figure,
1: Main body of electricity meter, 2: Terminal block, 2a:
Terminal block, 3a, 3b: Power supply side wiring, 4a, 4b:
Load side wiring, 5a, 5b, 5c: Output terminals on the main body side, 6a, 6b, 6c: Fixed terminal fittings forming the first fixed terminal fitting row, 7a, 7b, 7c: Second
Fixed terminal fittings constituting the fixed terminal fitting row, 8:
Drum type switching switch, 81: Drum body, 82,
83: Sliding contact member, 85, 86: Notching groove of notching mechanism, 87: Notching pin, 8
8: Mark for displaying operating position, P, Q: Direction of rotation operation of switching switch.

Claims (1)

[Claims] 1 A terminal device that connects external wiring on the power supply side and load side to a watt-hour meter, which is interposed between the main body of the watt-hour meter and the external wiring and is detachably connected to the main body. The terminal block has an insulated terminal block and a first fixed terminal metal row arranged in parallel on the opposite surface of the main body on the terminal block and removably connected to the lead-out terminal on the main body side. and the first
a second fixed terminal fitting row that is arranged in parallel on the opposite side of the terminal block and connected to the power supply and load side wiring; The fixed terminal fittings corresponding to the current circuit on the main body side are interposed between each other, and in the "measuring" position, the terminal fittings corresponding to each other between the first and second fixed terminal fitting rows are interposed. A drum-shaped switch that connects continuity and cuts off the energized path leading to the current circuit on the main body side by rotating from the "measurement" position to the "replacement" position, and at the same time short-circuits between the power supply side wiring and the load side wiring. The switching switch is equipped with a drum body having a movable contact member attached to a predetermined part of the circumferential surface of the main body made of an insulating material, and the first and second fixed terminal fittings. a sliding contact that is connected to a fixed terminal fitting corresponding to the current circuit on the main body side of the column, is in constant contact with the circumferential surface of the drum body, and moves on the circumferential surface when the drum body rotates; What is claimed is: 1. A terminal device for a watt-hour meter, comprising a notching mechanism for regulating the operating positions of the drum body, ie, a "measuring" position and a "replacement" position.