JP2573158B2 - Replacement method of single-phase three-wire watt-hour meter and transformer device used in this method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for replacing a watt-hour meter and a transformer device used in the method, and more particularly to a method for replacing a single-phase three-wire watt-hour meter without a power failure at a load side. The present invention relates to a method and a transformer device used in the method.

[0002]

2. Description of the Related Art As is well known, watt-hour meters are legally required to be replaced after a certain period of time has passed. Conventionally, such watt-hour meters are replaced by temporarily stopping power supply to customers. Had been However, with the spread of various home appliances, there are many troubles due to power outages,
In recent years, it has been impossible to replace the watt hour meter with such a power failure. Therefore, in the related art, in order to prevent a power failure from occurring when replacing the watt hour meter, the power supply side wiring and the load side wiring are connected by a bypass cable, and thereafter, the watt hour meter is replaced, or The replacement of the watt hour meter is performed using various devices proposed in Japanese Patent Application Laid-Open Nos. 3-9423, 3-26457, 3-28468, and the like.

[0003]

However, in the above-mentioned method using the bypass cable, the power supply wiring arranged outside the house and the load wiring arranged inside the house are connected. For this reason, very long cables have to be used and therefore a quick replacement of the watt-hour meter is not possible. Further, in the devices described in Japanese Patent Publication No. 3-9432 and Japanese Utility Model Publication No. 3-26457, when a power meter that has been used in the past is already attached to the power meter, a power failure occurs. The watt-hour meter can be easily replaced without a power supply, but when the device is mounted on the watt-hour meter, a power failure cannot be avoided, and at least it cannot be used at the present stage. Further, in the device described in Japanese Utility Model Laid-Open No. 3-28468, it is necessary to provide a part for attaching a terminal unit to a new watt-hour meter, and it is necessary to change the structure of the conventional watt-hour meter. Has the same problems as the device described in (1).

Accordingly, the present invention has been proposed to solve the problems of the above-described conventional technology, and does not involve a power failure when replacing the watt hour meter.
An object of the present invention is to provide a method for replacing a watt-hour meter without changing the structure of the watt-hour meter and using a long cable, and a transformer device used in this method.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above-mentioned object, and a first invention is a method for replacing a single-phase three-wire watt-hour meter, comprising An intermediate portion of the winding constituting the transformer, wherein a connection terminal formed at one end of the winding constituting the transformer is connected to the load-side first phase wiring connected to the watt hour meter to be replaced. Is connected to the load-side second-phase wiring connected to the watt-hour meter, and is connected to the other end of the winding constituting the transformer. Is connected to the load-side third-phase wiring connected to the watt-hour meter, and thereafter, one of the terminals of the power-supply-side first-phase to third-phase wiring connected to the watt-hour meter is connected. Terminals of two power-supply-side wirings and ends of load-side first to third-phase wirings connected to the watt-hour meter The terminals of one load-side wiring corresponding to the specific power-supply-side wiring are detached from the wattmeter and connected externally, and the terminals of the other power-supply-side wiring and the terminals of the load-side wiring are also connected to this terminal. The method is characterized in that the method further comprises a step of sequentially removing the power meter from the watt-hour meter and connecting the power meter externally in the same manner as the method. In addition, a step performed after the step of connecting the one end side connection terminal, the neutral line connection terminal, and the other end side connection terminal constituting the transformer to the load side first to third phase wirings may be, for example, a power supply. Disconnect the terminal of the first phase wiring on the load side and the terminal of the first phase wiring on the load side from the watt hour meter and connect them externally. Then, remove the second phase wiring on the power source side and the second phase wiring on the load side from the watt hour meter. In order from the first phase wiring to the third phase wiring, the terminal of the power source side third phase wiring and the terminal of the load side third phase wiring are removed from the wattmeter and connected externally. Not only the method of performing the above, but also the method of detaching the terminals of the power-supply side and the load-side first phase wiring in order from the terminals of the power-supply side and the load-side third phase wiring and connecting them externally. Power supply side and load side second
Remove each terminal of the phase wiring from the watt hour meter and connect it externally,
Next, a method of removing the terminals of the power-side and load-side third-phase wiring from the watt-hour meter and externally connecting the terminals may be used.
At least, before removing the specific power supply side to be removed from the watt hour meter and the specific load side wiring corresponding thereto from the watt hour meter, the other power supply side wiring and the load side wiring are interposed via the watt hour meter. Alternatively, the steps may be performed in any order as long as it is connected to the outside and energized. Further, a second invention is a transformer device used in the above method, wherein the housing has an outer shape formed in a rectangular parallelepiped shape, a single-turn transformer housed in the housing, and the housing One end side connection terminal disposed on the left and right sides of the front of the transformer and connected to one end of the winding constituting the transformer, respectively, and a neutral terminal connected to an intermediate portion of the winding constituting the transformer. And a first connector and a second connector each having a wire connection terminal and the other end side connection terminal connected to the other end of the winding constituting the transformer. Things.

[0006]

According to the method for replacing a single-phase three-wire watt-hour meter according to the first aspect of the present invention, the specific power supply side connected to the watt-hour meter to be replaced and the specific load-side wiring corresponding thereto are connected. Before being removed from the watt-hour meter, the other power-supply-side wiring and the load-side wiring are energized via a watt-hour meter or externally connected, and the load-side first phase through Since the one-side connection terminal, the neutral line connection terminal, and the other-side connection terminal constituting the single-turn transformer are connected to the third-phase wiring, the specific power supply-side wiring and the load corresponding thereto are connected. Even if the side wiring is removed from the watt hour meter, the power is also supplied to the specific load side wiring by the transformer. Terminals and loads of first to third phase wiring All of the first phase line to the third phase wiring terminal can be removed. Further, according to the transformer device of the second invention, since the first and second connectors are provided on the left and right sides of the front of the housing, a plurality of transformer devices are connected in parallel via a cable. This makes it possible to effectively avoid the occurrence of a power failure even when the load demand is high and the capacity of one transformer device is not sufficient. In particular, this transformer device not only has the first and second connectors as described above, but also has a housing shaped into a rectangular parallelepiped, so that a plurality of transformer devices can be stacked upward. Therefore, it is possible to effectively cope with a case where there is not enough space for installing a plurality of transformer devices.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. Prior to the description of the method of replacing the watt hour meter according to the present embodiment, first, the wiring state of the watt hour meter will be briefly described. As shown in FIG. 1, the watt-hour meter 1 is a single-phase three-wire watt-hour meter.
The power-supply first-phase to third-phase wirings 2, 3, and 4 are respectively provided via terminals (not shown), and correspond to the power-supply-side first to third-phase wirings 2, 3, and 4, respectively. The first to third phase wirings 5, 6 and 7 on the load side are connected via terminals (not shown). These power-supply first-phase to third-phase wirings 2, 3, and 4 and load-side first-phase to third-phase wirings 5, 6,
Each terminal 7 is connected to the watt-hour meter 1 by two screws 8, 8, respectively. The load-side first-phase to third-phase wirings 5, 6, and 7 are connected to a main breaker 9 (service) provided indoors (in FIG. 1, a dashed-dotted line separates the outdoor and indoor areas). The main breaker 9 is further connected to first to third sub-breakers 10, 11, and 12 connected to an outlet (not shown) or an electric light.

In the present embodiment, the replacement work of the watt hour meter 1 in the above-described wiring state is performed in accordance with FIGS.
, A connection cable 14 connected to the transformer device 13, and a relay connector 15 shown in FIG. As shown in FIG. 2, the transformer device 13 has a single-turn transformer built in a housing 16 having an outer shape formed into a rectangular parallelepiped and having a plurality of heat radiation holes 16a formed on an upper surface thereof. On the left and right sides of the front, connectors 17 and 18 (first and second connectors constituting the present invention) and a handle 19 to be gripped when carrying the transformer device 13 are formed. I have. As shown in FIG. 3, one of the connectors 17, 18 formed on the front left and right of the transformer device 13 is connected to one end of a winding 19 constituting the single-turn transformer. (One end side connection terminal) 17a, 18
a, second connection terminals (neutral connection terminals) 17b, 18b connected to the intermediate portion of the winding 19, and a third connection terminal (other end) connected to the other end of the winding 19 Side connection terminal) 1
7c, 18c, and the first to third connection terminals 17a, 17b, 17c (18a, 18b,.
8c) is formed at a position corresponding to the vertex of the equilateral triangle. Around the one of the connectors 17 and 18, a cylindrical portion 22a having a cylindrical shape made of a synthetic resin and having the one connector 17 (18) disposed therein.
And four screws 20, 21 formed integrally with the base end of the cylindrical portion 22 a on the front plate 16 a of the housing 16.
A protection member 22 (a protection member provided on the right side is not shown) composed of fixing portions 22b and 23b fixed by
25 are attached. These caps 24 and 25 are for protecting the one connector 17 and 18 when not in use, and have one ends fixed to the fixing portions 22b and 23b via the screws 20 and 21. It is mounted via chains 26,27.

The connection cable 14 connects the single-turn transformer housed in the transformer device 13 to the load-side first to third phase wirings 5, 6, and 7. As shown in FIG. 2, first to third lead wires 30, 31, 32 covered with an insulator (not shown) which are color-coded red, white, and black, respectively, are connected to an insulator 33. The connection portion 34 is formed at one end, and is connected to one end of the lead wires 30, 31, 32 in the connection portion 34. , The first connection terminals 17a,
The other connector 38 is formed of three connection terminals 35, 36, 37 connected to 18a, the second connection terminals 17b, 18b, and the third connection terminals 17c, 18c, respectively. The connecting portion 34 is formed of a synthetic resin, and has a cylindrical fitting portion 34a which is fitted into the cylindrical portion 22a of the protection member 22 at the tip. Also, at the other end of the connection cable 14,
The first to third lead wires 30, 31, 32 are exposed, and the other ends of these lead wires 30, 31, 32 are connected to load-side first to third phase wires 5, 6, 7, respectively. The first to third connection plates 40, 41, 42 in which the through holes 40a, 41a, 42a are formed are fixed in order to facilitate the electrical connection.

The relay connector 15 connects the terminals of the power-supply first-phase to third-phase wirings 2, 3, and 4 and the load-side first to third-phase wirings 5, 6, and 7, respectively. As shown in FIG. 4, a main body 45 formed of an insulating material into a substantially rectangular parallelepiped shape, and three first to fourth main bodies 45 formed in a direction orthogonal to the length direction of the main body 45 are formed. The first to third grooves 49, 50, 51, and the first to third grooves 49, 50, 51 are provided on the bottom surface of the first to third grooves 49, 50, 51, and are provided with two screw holes (not shown). Third
And two screws 5 on the upper surfaces of the first to third plate-like conductors 52, 53, 54, respectively.
First to sixth holding plates 57, 58, 59, 6 which are fixed via plates 5, 56 and formed into a plate shape by a conductor such as copper.
0, 61, and 62.

Hereinafter, a method of replacing the watt hour meter 1 shown in FIG. 1 will be described in detail using the transformer device 13, the connection cable 14, and the relay connector 15. In this embodiment, the power-supply-side first-phase wiring 2 and the load-side first-phase wiring 5 fixed to the watt-hour meter 1 with screws 8, 8 are removed, and then the power-supply-side second-phase wiring is removed. 3 and the load-side second-phase wiring 6, and finally, the work will be performed in the order of removing the power-supply-side third-phase wiring 4 and the load-side third-phase wiring 7. Therefore, first, one connector 17 of the transformer device 13 shown in FIG.
The first to third connection plates 40, 41, 42 constituting the connection cable 14 are attached to the connection cable 14.
Are connected to the first to third phase wirings 5, 6 and 7 on the load side. At this time, as shown in FIG. 5, the first connection terminal 17a electrically connected to the first connection terminal 17a connected to one end of a transformer (not shown) housed in the housing 16 of the transformer device 13 Is connected to the load-side third-phase arrangement 7, and the second connection plate 41 electrically connected to the second connection terminal 17b connected to the intermediate portion of the transformer, The third connection plate 41 connected to the load-side second phase wiring 6 and electrically connected to the third connection terminal 17c connected to the other end of the winding 19 is connected to the load-side first phase. Each is connected to the phase wiring 5.

When the connection work between the transformer device 13 and the load-side first to third phase wirings 5, 6, 7 via the connection cable 14 is completed, the power device 1 is then fixed to the watt-hour meter 1. The power-supply-side first-phase wiring 2 and the load-side first-phase wiring 5 are removed, and the respective terminals are attached to the relay connector 15 for external connection, as shown in FIG. That is, the terminal of the power-supply-side first phase wiring 2 is connected to the first holding plate 57 shown in FIG. 4, and the terminal of the load-side first phase wiring 5 is connected to the fourth holding plate 60 by two screws 55. , 56, and are externally connected by the first plate-shaped conductor 52 to be energized. Then, when this work is completed, next, the power-supply-side second-phase wiring 3 and the load-side second-phase wiring 6 fixed to the watt-hour meter 1 are removed.
Each terminal is connected to the relay connector 1 as shown in FIG.
5 for external connection. That is, the terminal of the power-supply-side second-phase wiring 3 is connected to the second holding plate 58 shown in FIG.
Then, the terminals of the load-side second-phase wiring 6 are fixed by the fifth holding plate 61 via the two screws 55 and 56, respectively, and are externally connected by the second plate-shaped conductor 53 and energized. Finally, the power-supply-side third-phase wiring 4 and the load-side third-phase wiring 7 fixed to the watt-hour meter 1 are removed, and their terminals are connected to the relay connector 15 as shown in FIG. Attach and connect externally. In other words, the terminals of the power-supply-side third phase wiring 4 are connected to the third holding plate 59 shown in FIG. , 56, and are externally connected by the third plate-shaped conductor 54 to be energized.

According to the above-described method, the terminals of the power supply-side first-phase to third-phase wirings 2, 3, and 4 and the load-side first phase are connected to the watt hour meter 1 without any power failure on the load side. All the terminals of the phase to third phase wirings 5, 6, 7 are removed. After that, a new watt-hour meter (not shown) is attached to a predetermined mounting position, and thereafter, the respective terminals on the power supply side and the load side are replaced with the new watt-hour meter again in the same manner as described above. .

In the above-mentioned method, the power supply side first phase wiring 2 to the third phase wiring 4 attached to the watt hour meter 1, and correspondingly, the load side first phase wiring 5 to the third phase wiring 7
The terminals are replaced in the relay connector 15 in the order described above. However, the order is not limited to this order as long as at least the power-supply-side wiring to be removed from the watt-hour meter 1 and the load-side wiring correspond to each other. You may go in.

Further, when the watt hour meter 1 is replaced by the above-described method, if the power demand of the customer is so large that one transformer device 13 cannot cope with it, as described above,
Since this transformer device 13 is provided with two connectors 17 and 18 as shown in FIG. 2, the first and second transformer devices 13A and 13A are provided as shown in FIG.
B are connected in parallel by a connection cable 70 and used. The connection cable 70 has one end connected to a first connection terminal 18a constituting the connector 18 provided in the first transformer device 13A, and the other end connected to the second transformer device 13A.
B, the first connection terminal 1 that constitutes the connector 17
7a and one end of the first cable 70a
The second connection terminal 18b of the connector 18 provided in the transformer device 13A is connected to the second connection terminal 18b, and the other end is provided in the second transformer device 13B to constitute the connector 17
Cable 70b connected to the connection terminal 17b
And one end is connected to a third connection terminal 18c constituting the connector 18 provided in the first transformer device 13A, and the other end is provided to the connector 17 provided in the second transformer device 13B.
And a third cable 70c connected to the third connection terminal 17c. As described above, by connecting the two transformer devices 13A and 13B in parallel using the connection cable 70, even the watt hour meter attached to the customer who has a high power demand can use the watt hour meter 1 without a power failure. Can be replaced.

[0016]

As is clear from the above description of the embodiment of the present invention, according to the method for replacing a single-phase three-wire watt-hour meter according to the present invention, the identification method connected to the watt-hour meter to be replaced Before removing the power supply side and the specific load side wiring corresponding to the power supply side from the wattmeter, the other power supply side wiring and the load side wiring should be energized by being connected via a watthour meter or externally connected. And one end side connection terminal, a neutral line connection terminal, and the other end side connection terminal which constitute a single-turn transformer are connected to the load-side first-phase to third-phase wirings, respectively. Therefore, even if the specific power-supply-side wiring and the corresponding load-side wiring are removed from the wattmeter, power is also supplied to the specific load-side wiring by the transformer. Without the power meter All terminals of the phase lines to third phase line terminal and the load side first phase wiring to the third phase wiring can be removed. Therefore, according to this method, it is not necessary to use a long cable and to change the structure of the conventional watt-hour meter, unlike the conventional method of replacing the watt-hour meter. Further, according to the transformer device of the second invention, since the first and second connectors are provided on the left and right sides of the front of the housing, a plurality of transformer devices are connected in parallel via a cable. This makes it possible to effectively avoid the occurrence of a power failure even when the load demand is high and the capacity of one transformer device is not sufficient. In particular, in this transformer device,
In addition to having the first and second connectors as described above, the housing is formed in the shape of a rectangular parallelepiped, so that a plurality of transformer devices can be stacked upward. Therefore, it is possible to effectively cope with a case where there is not enough space for installing a plurality of transformer devices.

[Brief description of the drawings]

FIG. 1 is a wiring diagram schematically illustrating an example of a wiring state of a watt hour meter.

FIG. 2 is a perspective view showing a transformer device and a connection cable.

FIG. 3 is a circuit diagram showing an electric circuit of the transformer device.

FIG. 4 is a perspective view showing the relay connector in a partially exploded manner.

FIG. 5 is a diagram illustrating a transformer device and load-side first to third phases;
It is a circuit diagram which shows the state which connected the phase wiring typically.

FIG. 6 is a diagram illustrating terminals of a power-supply-side first-phase wiring and a load-side first
It is a circuit diagram which shows the state after connecting the terminal of a phase wiring with a relay connector typically.

7 is a circuit diagram schematically showing a state after the terminals of the power-supply-side second-phase wiring and the terminals of the load-side second-phase wiring have been connected to the relay connector from the state shown in FIG. 6; .

8 is a circuit diagram schematically showing a state after the terminals of the power-supply-side third-phase wiring and the terminals of the load-side third-phase wiring have been connected to the relay connector from the state shown in FIG. 7; .

FIG. 9 is a circuit diagram schematically showing a state in which two transformer devices are connected in parallel.

[Description of sign]

 DESCRIPTION OF REFERENCE NUMERALS 1 power meter 2 power-supply first phase wiring 3 power-supply second phase wiring 4 power-supply third phase wiring 5 load-side first phase wiring 6 load-side second phase wiring 7 load-side third phase wiring 13 transformer device 16 Housing 17 One connector (first connector) 18 One connector (second connector) 17a First connection terminal (one-side connection terminal) 17b Second connection terminal (neutral connection terminal) 17c Third Connection terminal (other connection terminal) 18a First connection terminal (one connection terminal) 18b Second connection terminal (neutral connection terminal) 18c Third connection terminal (other connection terminal) 19 winding

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Noboru Goto 1 Kibuki-cho, Kasugai-shi, Aichi Chubu Seiki Co., Ltd. (56) References New edition of Electrical Engineering, Handbook Page 1224 1.3.2

Claims (2)

(57) [Claims] An end-side connection terminal formed at one end of a winding constituting a single-turn transformer is connected to a load-side first-phase wiring connected to a watt-hour meter to be replaced. A neutral line connection terminal connected to an intermediate portion of the winding constituting the transformer is connected to the load-side second phase wiring connected to the watt-hour meter, and is formed at the other end of the winding constituting the transformer. Connecting the other end side connection terminal to the load-side third phase wiring connected to the watt hour meter, and thereafter, connecting the power supply side first to third phases connected to the watt hour meter One of the terminals of the power supply side wiring among the terminals of the wiring, and the terminals of the first to third phase wirings on the load side connected to the watt-hour meter, corresponding to the specific power supply side wiring. Remove the terminals of one load-side wiring from the wattmeter and connect them externally, and A method for replacing a single-phase three-wire watt-hour meter, comprising a step of sequentially removing the terminals and the terminals of the load-side wiring from the watt-hour meter in the same manner as this method and connecting them externally. 2. A method for replacing a single-phase three-wire watt-hour meter, comprising: a housing having a rectangular parallelepiped outer shape; and a single-turn transformer housed in the housing. And one end side connection terminal disposed on the left and right sides of the front surface of the housing and connected to one end of a winding constituting the transformer, respectively, and connected to an intermediate portion of the winding constituting the transformer. First and second connectors respectively having a neutral wire connection terminal and a second end connection terminal connected to the other end of the winding constituting the transformer. A transformer device characterized by the above-mentioned.