JPH0323578Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Application of the Invention) The present invention relates to an electronic watt-hour meter with a structure capable of short-circuiting the power supply side wiring connected to the terminal fitting and the load side wiring without causing a power outage to the load. It is something.

(Background of the idea) It is stipulated that electricity meters must be replaced after a certain period of time. Conventionally, when replacing a watt-hour meter, the power supply side wiring and load-side wiring connected to the terminal fittings of the watthour meter were removed before work was performed, resulting in a power outage to the load during that time.

In addition, in order to avoid a power outage during the replacement of the watt-hour meter, as shown in FIG. Attach the short-circuit terminals 5 to each other by penetrating the coating, and connect the terminal fittings 2 between 1S and 1L and 2S.
-2L and 3S-3L are short-circuited,
Connecting between the short circuit terminals 5 with the electric wire 6,
Traditionally done. However, this method has a problem in that it is time-consuming.

(Purpose of the invention) The purpose of the invention is to solve the above-mentioned problems and automatically connect the power supply side wiring and the load side wiring without causing a power outage to the load and by separating the meter body from the base. An object of the present invention is to provide an electronic watt-hour meter that can be short-circuited.

(Characteristics of the invention) In order to achieve the above object, the present invention provides a base having a terminal block with a meter body separably attached to the meter body, and a through-type current transformer protruding into the inside of the base. is provided in the base, and is inserted into the primary conductor penetration part of the feed-through current transformer when the meter body is attached to the base, and centered around the fulcrum when the meter body is separated from the base. A movable contact for a primary current circuit that rotates and comes out of the primary conductor penetration part of the feed-through current transformer, a movable contact for a short circuit that rotates together with the movable contact for the primary current circuit, and a movable contact for a short circuit that rotates together with the movable contact for the primary current circuit, and when the meter body is installed, A primary current circuit of the through-type current transformer is formed between a terminal fitting connected to the power supply side wiring and a terminal fitting connected to the load side wiring by contacting the movable contact for the primary current circuit, and A fixed contact is provided that comes into contact with the movable short circuit contact when the main body is separated to form a short circuit between the terminal fitting connected to the power supply side wiring and the terminal fitting connected to the load side wiring. It is characterized in that the movable contact for the primary current circuit and the movable contact for the short circuit are switched in accordance with the attachment and detachment of the meter body.

(Embodiment of the invention) Figures 1 to 4 show a single-phase, two-wire electronic watt-hour meter that is an embodiment of the invention. The figures show the separated state of the instrument body.

The meter body 10 of the electronic watthour meter includes a base 11
It is separably fixed to the instrument body receiving portion 12 of the instrument body with a sealing screw (not shown). A through-type current transformer 13 provided in the meter body 10 projects inside the base 11, and a primary conductor through-hole 14 is located inside the base 11.

An insulating terminal block 17 of a terminal board 16 is fixed to a guard 15 welded to the base 11. The terminal block 17 has a wire insertion hole 18.
and a terminal fitting 20 having a terminal screw 19 is fitted. 1S and 2S of the terminal fittings 20 are connected to power supply side wiring (not shown), and 1L and 2L of the terminal fittings 20 are connected to load side wiring (not shown). The terminal fitting 20 is connected to a movable conductor 22 by an internal wiring 21.

The movable conductor 22 is rotatably supported by a fulcrum shaft 24 on a fulcrum shaft support member 23 fixed to the base 11 . The movable conductor 22 has a primary current circuit movable contact 25 and a short circuit movable contact 2 which are divided into two.
6, and when the instrument body 10 is attached to the base 11, the primary current circuit movable contact 25
is inserted through the primary conductor penetration portion 14 of the feed-through current transformer 13 and comes into contact with the fixed contact 27 . In this state,
The short circuit movable contact 26 is located outside the feedthrough current transformer 13 and does not come into contact with the fixed contact 27.

FIG. 2 shows the electrical connections when the meter body 10 is installed. Fixed contact 27 is 1S of terminal fitting 20
The internal wiring 21 is connected to 1L of the terminal fitting 20.
connected to. Therefore, the 1S-
A primary current circuit movable contact 25 is inserted between 1L and a primary current circuit of the feedthrough current transformer 13 is formed. The terminal fitting 20 between 2S and 2L is short-circuited from the beginning by a known terminal shorting piece 28 within the terminal block 17. 1S and 2S of terminal fitting 20
is a mating terminal 2 such as a plug terminal or a blade terminal.
It is connected to the voltage transformer 31 via 9 and 30. .

Therefore, the load voltage between 1S and 2S of the terminal fitting 20 is applied to the primary side of the potential transformer 31,
Since the load current flowing through 1S-1L of the terminal fittings 20 passes through the primary side of the feedthrough current transformer 13, the amount of power consumed by the load is measured.

When replacing the instrument body 10, loosen the sealing screw (not shown) and as shown in Fig. 3,
Remove the meter body 10 from the meter body receiving portion 12 of the base 11. At this time, the primary current circuit movable contact 25 receives a rotational force in the counterclockwise direction around the fulcrum shaft 24 from the primary conductor penetration part 14 of the feedthrough current transformer 13,
It slides on the fixed contact 27 and finally the fixed contact 2
It's off from 7. The movable contact 26 for the short circuit also rotates counterclockwise together with the movable contact 25 for the primary current circuit, and the movable contact 25 for the primary current circuit rotates counterclockwise together with the movable contact 25 for the primary current circuit.
7, it contacts the fixed contact 27. As a result, the short circuit movable contact 26 is inserted between 1S and 1L of the terminal fitting 20, and a short circuit is formed as shown in FIG. 4. At the same time, since the fitting terminals 29 and 30 are uncoupled, the instrument body 10
The electrical connection between the terminal fitting 20 and the terminal fitting 20 is cut off.
After that, replace it with a new meter body 10.

According to this embodiment, the power supply side wiring and the load side wiring can be automatically short-circuited by simply separating the meter body 10 from the base 11 without causing a power outage to the load. Further, since a separate shorting device and shorting work are not required, work efficiency can be improved.

The present invention can be applied not only to single-phase two-wire meters but also to other types of electronic watt-hour meters.

(Effects of the invention) As explained above, according to the invention, a meter body is separably attached to a base provided with a terminal block, and a through-type current transformer is attached to the meter body and protrudes into the inside of the base. is provided in the base, and is inserted into the primary conductor penetration part of the feed-through current transformer when the meter body is attached to the base, and centered around the fulcrum when the meter body is separated from the base. A movable contact for a primary current circuit that rotates and comes out of the primary conductor penetration part of the feed-through current transformer, a movable contact for a short circuit that rotates together with the movable contact for the primary current circuit, and a movable contact for a short circuit that rotates together with the movable contact for the primary current circuit, and when the meter body is installed, A primary current circuit of the through-type current transformer is formed between a terminal fitting connected to the power supply side wiring and a terminal fitting connected to the load side wiring by contacting the movable contact for the primary current circuit, and A fixed contact is provided that comes into contact with the movable short circuit contact when the main body is separated to form a short circuit between the terminal fitting connected to the power supply side wiring and the terminal fitting connected to the load side wiring. Therefore, the movable contact for the primary current circuit and the movable contact for the short circuit can be switched according to the attachment or detachment of the meter body.
By separating the meter body from the base and without causing a power outage to the load, the power supply side wiring and the load side wiring can be automatically short-circuited.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a circuit diagram showing the electrical connection of an embodiment of the present invention, Figure 3 is a cross-sectional view showing the instrument body of an embodiment of the invention in a separated state, and Figure 4 is the instrument body of an embodiment of the invention. FIG. 5 is a circuit diagram showing electrical connections in a separated state, and FIG. 5 is a wiring diagram showing connections when short-circuiting a conventional watt-hour meter. 10... Instrument body, 11... Base, 12...
Instrument body receiving part, 13... Through-type current transformer, 14...
Primary conductor penetration part, 16... terminal board, 17... terminal block, 20... terminal fitting, 22... movable conductor, 24... fulcrum shaft, 25... movable contact for primary current circuit, 26... short circuit Movable contact for 27...
Fixed contact, 29, 30...Mating terminal, 31...Instrument transformer.

Claims (1)

[Scope of utility model registration request] A meter body is separably attached to a base provided with a terminal block, a through-type current transformer protruding into the inside of the base is provided on the meter body, and the meter body is attached to the base. In this state, the primary conductor is inserted through the primary conductor through-hole of the through-type current transformer, and when the meter body is separated from the base, the primary conductor rotates around the fulcrum and comes out of the primary conductor through-hole of the through-type current transformer. A movable contact for a current circuit, a movable contact for a short circuit that rotates together with the movable contact for the primary current circuit, and a movable contact for a short circuit that rotates together with the movable contact for the primary current circuit, and when the instrument body is installed, it contacts the movable contact for the primary current circuit and is connected to the power supply side wiring. A primary current circuit of the through-type current transformer is formed between the terminal fitting connected to the load side wiring and the terminal fitting connected to the load side wiring, and when the meter body is separated, it contacts the movable contact for short circuit, and the power supply An electronic watt-hour meter comprising a fixed contact that forms a short circuit between the terminal fitting connected to the side wiring and the terminal fitting connected to the load side wiring.