JPH0211106B2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a terminal structure for a power meter.

[Technical background of the invention and its problems]

Wire connections on the power supply side and the load side of a socket-type watthour meter are made as shown in FIGS. 6 and 7. That is, by connecting the electric wires 27 on the power supply side and the load side to the terminals on the base 1 of the electricity meter, the contacts 3 on the base 1 side and the meter body 16
The power supply side and the load side are connected through the blade-shaped contact 18 of the meter body 16, the CT transformer 21, the blade-shaped contact 19 of the meter body 16, and the contact 4 on the base 1 side.

The meter body 16 side and the base 1 side are integrated by inserting the blade contacts 18, 19, 23 into the contacts 3, 4, 5, and separated by separating the former from the latter. Ru.

In this separated state, the power supply side and the load side are disconnected, and the load side enters a power outage state. At the end of the verification period or when a power meter breaks down, the meter main body 16 is removed and replaced, but the power is cut off until the meter main body 16 is removed and a new meter main body is installed.

When such a power outage occurs, problems occur such as the timer settings of video or audio products being canceled and the set recordings becoming impossible, and the stored contents of electronic devices such as personal computers being lost.

[Purpose of the invention]

The present invention aims to provide a terminal structure for a watt-hour meter that prevents a power outage on the load side when the meter main body of the watt-hour meter is replaced.

[Summary of the invention]

The present invention provides a terminal box to which an electric wire from the outside is connected, a base having three contacts each formed of a pair of opposing tongue pieces having elastic force, and each contact of the base. A watt-hour meter comprising three blade-shaped contacts arranged so as to be insertable between the tongue pieces of the base and a meter body having a measuring part for measuring the electric power supplied to the base, wherein the contact of the base Among the two contacts, which are connected to the power supply side and the load side, respectively, and which form a current path by contact with the blade-shaped contact, are arranged between respective tongues of the two contacts, which respond to the advance and retreat of the blade-shaped contact, and The meter body of the watt-hour meter is equipped with a movable contact that contacts each tongue to connect the power supply side and the load side before the contact between the blade contact and each tongue is released. When separating the base, the movable contact and the contact are connected to maintain the connection between the power supply side and the load side to prevent a power outage on the load side, causing problems such as loss of memory contents of electronic devices, etc. This is the terminal structure of the watt-hour meter that prevents this from occurring.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 4.

In this embodiment, a base 1 has a meter body 16 incorporating a measuring section for measuring electric power, and a terminal for connecting the meter body 16 between a power supply side and a load side.
It is composed of.

The base 1 is formed of a terminal box 26 to which electric wires on the power supply side and load side are connected, and a connection part to which the meter main body 16 is attached. The electric wire is connected to the terminal screw 15 of this terminal box 26,
Terminal fittings 12, 13, 14, lead wires 9, 10,
11 and contacts 3, 4, and 5 in this order.

The contacts 3, 4, and 5 are arranged facing each other,
It consists of a pair of tongues that have elasticity. Blade-like contacts 18, 19, 23 of the meter main body 16 are inserted into contact between the tongue pieces of each of the contacts 3, 4, 5.

The blade contacts 18, 19, and 23 penetrate through the insulating bottom portion 17 of the meter body 16 and are attached thereto. The portions projecting outward from the insulating bottom 17 are contacted by the contacts 3, 4, 5 of the base. That is, when the meter main body 16 is moved toward the base 1 side and the two are brought into alignment, the blade-shaped contacts 18, 19, 23 are press-fitted between the tongues of the contacts 3, 4, 5 and are in contact. Become.

Further, the blade-like contacts 18 and 19 have insulating parts 18a and 19a at the tips and an insulating bottom part 17.
The side is a conductive part.

On the other hand, the inside of the meter body 16 of the blade-shaped contacts 18, 19, 23 is connected to a power metering section. This measuring section includes a through-type CT transformer 21 that detects current from a current line 20 between the blade contacts 18 and 19, and a PT transformer connected between the blade contacts 18 and 23.
It is composed of a transformer 22 and the like.

As shown in FIG. 2, the current path is formed such that one end on the power supply side is connected to one end on the load side via the contact 3, the blade contacts 18, 19, and the contact 4.

Furthermore, movable contacts 7 and 8 are attached to the base 1 and can be inserted into and brought into contact between the respective tongues of the contacts 3 and 4. The movable contacts 7 and 8 are configured to enter the contacts 3 and 4 from a direction opposite to the direction in which the blade contacts 18 and 19 enter.

That is, the movable contacts 7 and 8 are connected to the insulating plate 2
The guide members 7a, 8a passing through the insulating plate 2 and the movable contacts 7, 8 of the guide members 7a, 8a
The guide members 7a, 8a are inserted between the movable contacts 7, 8.
A coiled spring 6 that always biases the contacts 3 and 4 in the direction of the contacts 3 and 4, and a shorting piece 24 that electrically connects and integrates both the guide members 7a and 8a on the back side of the insulating plate 2, The contacts are biased in the 3 and 4 directions.

Further, the movable contacts 7 and 8 are electrically connected by both guide members 7a and 8a and a shorting piece 24.

Next, the operation of one embodiment configured as described above will be explained.

First, a so-called usage state in which the meter body 16 is integrally attached to the base 1 will be described. As shown in FIG. 4, the blade contact 18 of the meter body 16,
19 is press-fitted between the tongues of the contacts 3 and 4 of the base 1. Due to this contact between the two, the power source side and the load side are electrically connected via the meter body 16, and power is supplied to the load, and the amount of power used is measured by a measuring section within the meter body 16. Although not shown in FIG. 4, the blade-shaped contact 23 is also brought into contact with the contact 5 at the same time as these contact, and voltage is detected.

On the other hand, in this state, the movable contacts 7 and 8 of the base 1 are pushed by the tip insulating parts 18b and 19b of the blade contacts 18 and 19 and withdrawn from between the contacts 3 and 4, and the contact state is It has been canceled.

In this way, when the watt-hour meter is in use, the movable contacts 7 and 8 are out of contact with the contacts 3 and 4.

Now, in this state, when the meter body 16 is removed from the base 1 for the purpose of repair etc., the blade contact 1
Before the movable contacts 8, 19 are separated from the tongues of the contacts 3, 4, the movable contacts 7, 8 come into contact with the contacts 3, 4, electrically connecting both the contacts 3, 4.
Thereby, the power supply side and the load side are electrically connected via the contactor 3, the movable contactor 8, the guide member 8a, the shorting piece 24, the guide member 7a, the movable contactor 7, and the contactor 4. That is, before the meter body 16 and the base 1 are completely electrically separated, the power supply side and the load side are electrically connected by the movable contacts 7, 8, etc., so that the load side does not experience a power outage. has been done.

In addition, in this embodiment, the blade-shaped contacts 18, 19
Although the insulating parts 18b and 19b are provided at the tips of the movable contacts 18b and 19b, it is only necessary to maintain the insulating state between the blade-like contacts 18 and 19 and the movable contacts 7 and 8. An insulating part may be provided, or another insulating member may be interposed between both contacts.

In addition, when stopping the power supply, if a member having blade-shaped insulators 25, 25 as shown in FIG. The movable contacts 7, 8 are retracted by the insulators 25, 25, and the contacts 3, 4 are not connected and power is not supplied.

〔Effect of the invention〕

Since the present invention is configured in this manner, when the meter main body is removed from the base for repairs or the like, it is possible to maintain the energized state between the power supply side and the load side, and there is no need to cause a power outage on the load side. Further, by removing the meter body from the base, the energized state can be maintained automatically, which has the effect of improving work efficiency.

[Brief explanation of drawings]

1 to 4 are for explaining one embodiment of the present invention, in which FIG. 1 is an exploded perspective view, FIG. 2 is a circuit diagram showing an electrical connection state, and FIGS. 3 and 4. are partial configuration diagrams showing different electrical connection states, respectively;
FIG. 5 is a partial configuration diagram showing a modified example, FIGS. 6 and 7 are for explaining a conventional example, FIG. 6 is an exploded perspective view, and FIG. 7 is a circuit diagram showing an electrical connection state. It is. DESCRIPTION OF SYMBOLS 1... Base, 2... Insulating plate, 3, 4, 5... Contact, 6... Spring, 7, 8... Movable contact, 7a, 8a
...Guide member, 9, 10, 11...Lead wire, 1
2, 13, 14...Terminal fitting, 15...Terminal screw, 1
6...Meter body, 17...Insulating bottom, 18, 19,
23...blade contact, 18a, 19a...conductive part, 1
8b, 19b...Insulating part, 20...Current line, 21...
CT transformer, 22... PT transformer, 24... shorting piece, 25... blade insulator, 26... terminal box, 27... electric wire.

Claims (1)

[Claims] 1. A terminal box to which the electric wires on the power supply side and the load side are connected, and a base having three contacts, each consisting of a pair of tongues arranged facing each other and possessing elastic force, and each contact on this base. A watt-hour meter comprising three blade-shaped contacts arranged so as to be insertable between the tongue pieces of the base and a meter body having a measuring part for measuring the electric power supplied to the base, wherein the contact of the base Among the two contacts, which are connected to the power supply side and the load side, respectively, and which form a current path by contact with the blade-shaped contact, are arranged between respective tongues of the two contacts, which respond to the advance and retreat of the blade-shaped contact, and A terminal structure for a watt-hour meter characterized by comprising a movable contact that contacts each tongue and connects a power supply side and a load side before the contact between the blade-shaped contact and each tongue is released. .