JPH031823Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a structure for periodically replacing electric metering/measuring equipment such as a watt-hour meter without interruption.

(Prior art) Power is normally supplied from the power distribution line (hereinafter referred to as the power supply side) to the electricity consumer (hereinafter referred to as the load side) via a watt-hour meter, but this watt-hour meter must be replaced regularly. I have to. Conventionally, at the time of such replacement, a so-called power outage state occurred in which the power supply side and the load side were disconnected, albeit temporarily. In other words, electricity meters were constructed by completely separating these wirings from their terminals.

(Problem that the invention aims to solve) A power outage that occurs as described above will disrupt daily life if the load side is a general household, and will completely stop the functions of factories, hospitals, etc. This includes the problem of having to operate an emergency in-house power generator.

Therefore, the purpose of the present invention is to short-circuit the power supply side lead-in wiring and the load-side lead-out wiring when the watt-hour meter is removed, and to supply power to the load side through the bypass path caused by this short circuit without going through the watt-hour meter. This is an uninterruptible replacement structure for watt-hour meters, etc. that allows the watt-hour meter to be replaced without a power outage by separating the power supply side lead-in wiring and the load-side lead-out wiring at the same time as the meter is installed. It's on offer.

(Means for solving the problem) In order to achieve the above purpose, the uninterruptible replacement structure of the watt-hour meter, etc. according to the present invention has the power supply side lead-in wiring connected to the terminal of the power metering/measuring device such as the watt-hour meter. The input side adapter terminal connected to the input side adapter terminal and the output side adapter terminal connected to the load side lead-out wiring are configured to removably connect the built-in adapter in a mutually insulated state, and the adapter terminal is formed on each adapter terminal of the adapter. a pin receiving hole; a connecting pin that is connected to and projects from the terminal of the terminal, and that is inserted into the pin receiving hole of the corresponding adapter terminal to electrically connect the terminal of the terminal and the adapter terminal; A short circuit is constantly pressed by a spring biasing force toward the side that contacts a pair of input side adapter terminals and an output side adapter terminal, and a short circuit is fixed to this short circuit, and the short circuit is fixed to the pair of input side adapter terminals by the spring biasing force. When it is in contact with the output side adapter terminal, it rushes into the pin receiving hole, and when it is pressed by the connecting pin inserted into this pin receiving hole and retreats from this pin receiving hole, it resists the spring biasing force. A cam protrusion that separates the short circuit from the input side and output side adapter terminals.

(Example) Hereinafter, the details of the present invention will be explained based on the drawings.

Figure 1 is a front view of the present invention applied to a power meter with AC three-phase three-wire wiring.The power meter A consists of a power meter body 1 and a terminal 2 connected to it. 2 is connected to an adapter 3, and the power supply side lead-in wire 4 and the load-side lead-out wire 5 are connected to the adapter 3, so that the power supply side → adapter 3 → terminal 2 → watt-hour meter body 1 → terminal 2 → adapter 3 →Electrification across the load side is ensured, and electricity meter A performs measurement operation. Note that a rubber gasket 6 shown in FIG. 2 is sandwiched between the terminal 2 and the adapter 3.

As shown in FIGS. 2 and 4b, the terminal 2 has a terminal body 2a made of an insulating resin molded product.
Three input side terminal terminals 7 arranged horizontally and three output side terminal terminals 8 arranged horizontally are inserted in a mutually insulated state. Pin receiving holes 9 are provided in the lower half of these terminals 7 and 8.
(Conventionally, the power supply side and load side wiring was connected to this hole) is opened, and the connecting pin 10 inserted from the bottom into this pin receiving hole 9 is connected to the terminal terminals 7 and 8 from the front side. It is fixed with a set screw 11 screwed in from the top. Therefore, the front surface of the terminal body 2a is opened so that the terminals 7 and 8 are exposed, and this opening is normally covered with a cover 2b. The connecting pin 10 projects downward from the terminal 2 when connected to the terminals 7 and 8, and is provided for connection to the adapter 3.

As shown in FIGS. 2 to 4, the adapter 3 is
The adapter body 3a, which is an insulating resin molded product, has three input side adapter terminals 12 connected in a straight line up and down to the input side terminal terminal 7, and three output side adapter terminals connected in a straight line up and down to the output side terminal terminal 8. 13 are inserted horizontally in a mutually insulated state. A pin receiving hole 14 is opened in the upper half of each adapter terminal 12, 13, and the terminal terminal 7,
The connecting pin 10 fixed at 8 can be inserted in a fitted manner. As shown in FIG. 4a, the connecting pin 10 inserted into the pin receiving hole 14
are pressed and fixed with setscrews 15 screwed into the front surfaces of the adapter terminals 12 and 13, whereby the terminals 2 and the adapter 3 are interconnected both mechanically and electrically.

In addition, a crimp terminal 6 for wiring connection is attached to the lower end of each adapter terminal 12, 13 with a set screw 17, and the power supply side lead-in wiring 4 is connected to the crimp terminal 6 of the input side adapter terminal 12, and the output A load side lead wire 5 is connected to the crimp terminal 16 of the side adapter terminal 13. In order to connect the connection pin 10 and each wiring 4, 5, the adapter body 3a
The front side of the terminal body 2a is opened like the terminal body 2a, and this front side opening is normally closed with a cover 3b.

That is, under normal conditions, current flows from the power supply side lead-in wiring 4 through the crimp terminal 16 and input side adapter terminal 12 to which these are connected, to the connection pin 10,
As a result, the flow passes through the input side terminal terminal 7 and enters the power meter main body 1, and then flows through the output side terminal terminal 8 connection pin 10, the output side adapter terminal 13, and the crimp terminal 16 to the load side lead-out wiring 5.
Power is supplied to the load side, and the amount of power used on the load side is measured by the wattmeter A.

Inside the adapter body 3a, a cavity 18 is formed between the rear cover 3c and the back cover 3c, as shown in FIG. Three short circuits 26 are installed in this empty space 18. Each of these short circuits 26 short-circuits one input side adapter terminal 12 and one output side adapter terminal 13 forming a pair.
It is set so that it is in contact with and separated from it. That is, each short circuit 26 is always connected to the adapter terminals 12, 13 by the biasing spring 27 stretched between it and the back cover 3c.
It is pressed toward the side and remains in contact with these adapter terminals 12 and 13 unless a force is applied that resists this biasing force. Moreover, at both ends of each short circuit 26,
A cam protrusion 28 made of an insulating material is fixedly attached so as to protrude into the pin receiving hole 14 while in contact with the adapter terminals 12 and 13. Therefore, when the cam protrusion 28 is retreated out of the pin receiving hole 14 against the biasing force of the biasing spring 27, the short circuit 26 is separated from the adapter terminals 2, 13.

With this configuration, in the normal state where the electricity meter A is connected to the adapter 3 as shown in FIG. The connecting pin 10 inserted into the cam protrusion 28
By retracting the short circuit 26 outward, the short circuit 26 can be kept separated from the adapter terminals 12 and 13. Therefore, all the electric power is sent through the watt-hour meter A, and there is no problem in metering.
In addition, in order to replace electricity meter A, terminal 2
When removed from the adapter 3, the cam protrusion 28 enters the pin receiving hole 14 from which the connecting pin 10 was removed, as shown in FIG. Side adapter terminal 1
3 to short-circuit them. Therefore, the voltage input to the adapter 3 via the power supply side lead-in wiring 4 is sent directly to the load-side lead-out wiring 5 via the input side adapter terminal 12, the short circuit 26, and the output side adapter 13, so that the amount of electric power is reduced. Even if meter A is removed, the load side remains uninterrupted. Thus, according to the above configuration, the connection pin 10 of the terminal 2 is connected to the input side and the output side adapter terminal 1.
The watt-hour meter can be replaced without any special short-circuiting operation other than the work of inserting and removing the watt-hour meter A into and from the pin receiving holes 14 of 2 and 13, that is, the work of removing and attaching the watt-hour meter A.

(Effects of the invention) As is clear from the above explanation, according to the invention, it is possible to replace the watt-hour meter, etc. while maintaining the load side in an uninterrupted state. This has the effect of not causing any inconvenience to the load side.

In addition, by removing the watt-hour meter, etc., the short circuit automatically shorts the input side adapter terminal and the output side adapter terminal to avoid an uninterrupted state on the load side. Since the short-circuit condition is automatically released by performing the installation work, there is no need to perform any special work to avoid an uninterrupted state on the load side, and the work of replacing the watt-hour meter is easy. It also has the effect of being able to

[Brief explanation of the drawing]

Figure 1 is a front view of the electricity meter in normal use, Figure 2 is an exploded perspective view of the terminal body and adapter, Figure 3 is an exploded perspective view of the adapter body, Figure 4 a,
b is an explanatory diagram of the operation. 1...Power meter body, 2...Terminal, 3...
...Adapter, 4...Power supply side lead-in wiring, 5...Load side lead-out wiring, 7, 8...Terminal terminal, 1
0... Connection pin, 12... Input side adapter terminal,
13...Output side adapter terminal, 14...Pin receiving hole, 26...Short circuit, 27...Biasing spring, 28...
...Cam protrusion, A...Power meter.

Claims (1)

[Scope of Claim for Utility Model Registration] If the terminal of an electric metering/measuring device such as a watt-hour meter is connected to an input side adapter terminal to which a power supply side lead-in wiring is connected and an output-side adapter terminal to which a load side lead-out wiring is connected, A structure for removably connecting an insulated built-in adapter, comprising: a pin receiving hole formed in each adapter terminal of the adapter; A connecting pin that electrically connects the terminal of the terminal and the adapter terminal by being inserted into the pin receiving hole of the adapter terminal, and a spring biasing force that constantly moves the connecting pin to the side that contacts the pair of input side adapter terminal and output side adapter terminal. When the short circuit is pressed and is fixed to this short circuit and is in contact with the pair of input side and output side adapter terminals by the spring biasing force, the short circuit enters the pin receiving hole and the pin A cam protrusion that resists the spring biasing force and separates the short circuit from the input side and output side adapter terminals when pressed by the connecting pin inserted into the receiving hole and retreated from the pin receiving hole. An uninterruptible replacement structure for power meters, etc., characterized by