JP2003162952A - Ground-fault interrupter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ground-fault interrupter capable of improving workability in assembly. <P>SOLUTION: The ground-fault interrupter comprises a zero-phase current transformer 11 which is, housed in a case and formed annularly, wound with a secondary coil, and strip primary conductors 12, 14, and 15 which are connected to the terminals arranged with prescribed spaces on both sides in penetration direction through a partition 13 of the case after penetrating the annular part of the zero-phase current transformer 11, while both end sides of outer two phases portions 12 and 14 are bent at the penetration part to be parallel to the side surface of the zero-phase current transformer 11. Both primary conductors 12 and 14 of two phases portions are divided at a prescribed position on any one end side arranged to be parallel to the side surface of the zero-phase current transformer 11. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground fault circuit breaker that operates a circuit breaker by detecting a ground fault in a primary conductor, and more particularly to an arrangement of primary conductors.

[0002]

2. Description of the Related Art A zero-phase current transformer and a primary conductor must detect a weak leakage current from a vector sum of primary currents including a starting rush current (about 6 times the rated current) of a motor load or the like. Since it is required to improve the output characteristics and the balance characteristics with high sensitivity and to be integrated into the housing of the earth leakage breaker, the small size is also an important factor.

6 to 8 are shown in, for example, Japanese Patent Laid-Open No. 9-921.
It is the top view which shows the structure of this kind of conventional earth leakage circuit breaker currently disclosed by Unexamined-Japanese-Patent No. 27 grade | etc., A front view which fractures | ruptures a part, and a side view. In the figure, 1 is a zero-phase current transformer 2, 3, in which an annular secondary winding (not shown) is wound.
Reference numeral 4 denotes a band-plate-shaped primary conductor that penetrates the annular portion of the zero-phase current transformer 1 and is connected between terminals (not shown) arranged at predetermined intervals on both sides in the penetration direction. The phase components 2 and 4 are bent from the penetrating portion and are arranged parallel to the side surface of the zero-phase current transformer 1.

Although not shown, each primary conductor 2,
In the penetrating portions 3, 4 are insulated from each other by winding a flexible insulating tape or covering them with an insulating resin member.

[0005]

The conventional earth leakage circuit breaker is constructed as described above, and the primary conductors 2, 3, 4 penetrate the annular portion of the zero-phase current transformer 1 in order to improve the equilibrium characteristics. In the portion, as shown in FIG. 7, as close as possible, the gap between the primary conductors 2, 3, 4 and the zero-phase current transformer 1 (indicated by d in FIG. 6) becomes small in order to reduce the size. Are arranged on both sides, as shown in FIG.
However, there is a problem in that it is difficult to insert and the assembly workability is deteriorated.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an earth leakage circuit breaker capable of improving assembly workability.

[0007]

The earth leakage circuit breaker according to claim 1 of the present invention is a zero-phase current transformer in which a secondary winding is wound, which is housed in a housing and formed in an annular shape, and a zero-phase current transformer. The two parts of the outer two phases are bent from the penetrating part and are connected to each other through the annular part of the sink device and on both sides in the penetrating direction through the partition walls of the housing, and are connected to each other at predetermined intervals. In an earth leakage circuit breaker having a strip plate-shaped primary conductor arranged in parallel with each side surface of a phase current transformer, both primary conductors for two phases are arranged in parallel with each side surface of a zero-phase current transformer. In addition, the division is made at a predetermined position on one end side.

The earth leakage circuit breaker according to a second aspect of the present invention is the earth leakage circuit breaker according to the first aspect, wherein the two primary conductors for the two phases are on the terminal side corresponding to the partition wall of the housing and from the bent portion. It is designed to be divided at a position closer to the inner diameter of the zero-phase current transformer.

The earth leakage circuit breaker according to claim 3 of the present invention is the leakage breaker according to claim 1 or 2, wherein the two primary conductors for two phases are divided on the side different from the side to which the load is connected. Is.

According to a fourth aspect of the present invention, there is provided an earth leakage circuit breaker, which is housed in a housing, has a ring shape, and has a secondary winding wound around it. A primary conductor for each phase in a ground fault circuit breaker including a strip plate-shaped primary conductor that is connected to each terminal that is disposed at a predetermined interval through partition walls of the housing on both sides in the penetration direction Are arranged so that the number of parts facing the zero-phase current transformer is equal.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1. 1 shows a configuration of a zero-phase current transformer of an earth leakage circuit breaker according to Embodiment 1 of the present invention. (A) is a plan view, (B) is a partially cutaway front view, and (C) is 1 is a side view, FIG. 2 is a diagram showing a method of inserting the first primary conductor in FIG. 1, FIG. 3 is a diagram showing a method of inserting the second primary conductor in FIG. 1, and FIG. 4 is a third primary conductor in FIG. It is a figure which shows the insertion method of.

In the figure, 11 is a zero-phase current transformer formed in an annular shape, and a secondary winding is wound along the annular shape, although not shown. 12 penetrates the annular part of the zero-phase current transformer 11,
Both ends are first primary conductors which are bent from this penetrating portion and arranged in parallel along both sides of the zero-phase current transformer 11, and both ends have a leakage breaker on both sides of the zero-phase current transformer 11. Seat portions 12a and 12b, which are respectively connected to one of terminals (not shown) arranged at a predetermined interval via a partition wall 13 formed in the housing of the seat, are formed, and the seat portion 12b is formed. The divided portion 12c is formed in the parallel portion on the side, and the divided portion 1 is formed.
2c has a dimension from the bent portion (indicated by l ₁ in FIG. 1) shorter than the inner diameter dimension of the zero-phase current transformer 11 (indicated by l ₂ in FIG. 1),
That is, it is formed at a position closer to the inner diameter dimension l _{2 of the} zero-phase current transformer 11 from the bent portion.

Reference numeral 14 penetrates the annular portion of the zero-phase current transformer 11,
Both ends are second primary conductors which are bent from this penetrating portion in a direction different from that of the first primary conductor 12 and are arranged in parallel along both sides of the zero-phase current transformer 11. Similar to the first primary conductor 12, seat portions 14a and 14b respectively connected to one of terminals (not shown) are formed, and a split portion 14c is formed in a parallel portion on the seat portion 14b side. ,
Similar to the first primary conductor 12, the split portion 14c is formed so that the dimension l ₁ from the bent portion is shorter than the inner diameter dimension l _{2 of the} zero-phase current transformer 11. Reference numeral 15 denotes a seat portion 15a which penetrates the annular portion of the zero-phase current transformer 11 and is connected to one of terminals (not shown) on both end sides similarly to the first and second primary conductors 12 and 14, respectively. A load is connected to the seat portions 12b, 14b, 15b of the respective primary conductors 12, 14, 15 by the third primary conductor 15b.

Next, a method of assembling the earth leakage breaker according to the first embodiment configured as described above will be described with reference to the drawings. First, although not shown, the first and second primary conductors 1
A flexible insulating tape is wound around the halves of the second and the fourth conductors 15 and the third primary conductor 15 to cover the surface thereof. next,
As shown in FIG. 2 (A), one half of the first primary conductor 12 is moved in the direction indicated by the arrow in the drawing to pass through the annular portion of the zero-phase current transformer 11. Next, after moving the first primary conductor 12 to the position shown in FIG. 3 (B), one half of the second primary conductor 14 is moved in the direction shown by the arrow in the figure as shown in FIG. 3 (A). It is moved and passed through the annular portion of the zero-phase current transformer 11.

Next, after moving both primary conductors 12 and 14 in a straight line in the direction indicated by the arrow in FIG. 3B, the first and second primary conductors 12 are indicated by the arrow in FIG. , 14 are brought into contact with the corresponding halves via the divided portions 12c and 14c, respectively, for example, brazing,
They are integrated by fixing by caulking and welding. Then, the third primary conductor 15 is passed through the annular portion of the zero-phase current transformer 11, and at the penetrating portion, both the first and second primary conductors 12 and 14 are covered with a resin member from above the insulating tape. , The zero-phase current transformer 11 is fixed and integrated, the seats 12a, 14a, 15a are fixed to corresponding terminals, and the seats 12b, 14b, 15b function as terminals to which loads are connected.

As described above, according to the first embodiment, the split portions 12c and 1 are provided in the parallel portions of the first and second primary conductors 12 and 14 arranged along the zero-phase current transformer 11, respectively.
4c is formed, each primary conductor 12, 14, 15
Even if the bent portions are densely packed and the gap with the zero-phase current transformer 11 is narrow even in the bent portion, the insertion into the zero-phase current transformer 11 is facilitated, and the assembling workability can be improved. Since the divided portions 12c and 14c are formed at positions closer to the inner diameter of the zero-phase current transformer 11 from the bent portion, they can be easily inserted in the same posture as that at the time of assembly as shown in FIG. 2 and FIG. Since it is possible to improve the assembling workability, it is needless to say that although not described in the above configuration, the partition walls 13 make the seats 12b, 14 respectively.
Since it is formed on the side where b is connected, the first and second
Connecting portions 12c, 14c of the primary conductors 12, 14 of the
Since the insulation between the primary conductor 15 and the primary conductor 15 is not necessary, and the insulating work such as winding an insulating tape after the connection can be omitted, it is possible to further improve the assembly workability and reduce the cost.

In the above structure, the divided portions 12c and 14c of the first and second primary conductors 12 and 14 are respectively seat portions 12b and 1b which are respectively connected to terminals on the side to which a load is connected.
The case of forming on the 4b side has been described, but the seat portion 1 is connected to the terminals on the sides different from the side to which the load is connected.
It may be formed on the side of 2a, 14a. In this case, as compared with the load side on which the connection work with the terminal is frequently performed, the load on each divided portion 12c, 14c by the connection work can be reduced, It is possible to improve reliability.

Embodiment 2. FIG. 5 shows a structure of an earth leakage breaker according to Embodiment 2 of the present invention, (A) is a plan view, (B) is a partially cutaway front view, (C),
(D) is a side view of the main part. In the figure, the same parts as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

Like the first primary conductor 12 in the first embodiment, the numeral 22 penetrates the annular portion of the zero-phase current transformer 11 and both ends are bent from this through-portion so that the zero-phase current transformer 11 has the same shape. First primary conductors arranged in parallel along both sides. Terminals (both not shown) arranged at predetermined intervals via partition walls 13 on both sides of the zero-phase current transformer 11 at both ends. ) Is formed with seat portions 22a and 22b, respectively, and a split portion 22c is formed in a parallel portion on the seat portion 22b side. Both seat portions 22a and 22b are shown in FIG. As shown, they are arranged with a step h.

Similarly to the second primary conductor 14 in the first embodiment, the reference numeral 23 penetrates the annular portion of the zero-phase current transformer 11 so that both ends are in a different direction from the penetrating portion to the first primary conductor 22. The first primary conductor is bent and is arranged in parallel along both sides of the zero-phase current transformer 11, and the zero-phase current transformer 1 is provided at both ends.
Seat portions 23a and 23b, which are connected to one of terminals (not shown) respectively arranged at a predetermined interval via the partition wall 13 on both sides of 1, are formed on the seat portion 23b.
A split portion 23c is formed in the parallel portion on the side, and both seat portions 2
3a and 23b are arranged with a step h as shown in FIG. 5 (C).

Reference numeral 24 penetrates the annular portion of the zero-phase current transformer 11,
As shown in FIG. 5 (D), one end side is bent downward from this penetrating portion and extends along one side of the zero-phase current transformer 11 and then makes a U-turn, and the other end side is bent upward from the penetrating portion. The third primary conductor which is bent along the other side of the zero-phase current transformer 11 and is then bent in a square shape. The zero-phase current transformer 11 is provided at both ends.
Seat portions 24a, 24b, which are respectively connected to one of terminals (not shown) arranged at a predetermined interval via the partition wall 13, are formed on both sides of the seat portions 24a, 24a.
4b is each seat portion 2 of the first and second primary conductors 22 and 23.
Like 2a, 22b and 23a, 23b, they are arranged with a step h. The seats 22b, 23b, 24b on the side to which the load is connected also serve as terminals.

As described above, according to the second embodiment, as shown in FIG. 5B, the primary conductors 22, 23, 24 are closely packed at the penetrating portions, so that the balance characteristic can be improved. As a matter of course, the primary conductors 22, 23, 24 and the zero-phase current transformer 11 are arranged so that the number of opposing portions thereof is equal, that is, the first and second primary conductors 22, 23 are shown in FIG. C) facing each other on the three surfaces indicated by arrows, and the third primary conductor 2
4 are arranged so as to face each other on the three surfaces indicated by arrows in FIG. 5 (D), the respective primary conductors 22, 23, 24
Since the influence of the magnetic field on is also the same, the equilibrium characteristics are further improved.

[0023]

As described above, according to the first aspect of the present invention, the zero-phase current transformer housed in the housing and having the secondary winding wound around the annular shape, and the zero-phase current transformer. Connected to each terminal arranged at a predetermined interval through partition walls of the housing on both sides in the penetrating direction through the annular part of the container, and both ends of the outer two phases are bent from the penetrating part to zero phase. In an earth leakage circuit breaker having a strip plate-shaped primary conductor arranged in parallel with each side surface of a current transformer, both primary conductors for two phases are arranged in parallel with each side surface of a zero-phase current transformer. Since it is divided at a predetermined position on one end side, it is possible to provide the earth leakage breaker capable of improving the assembly workability.

According to a second aspect of the present invention, in the first aspect, both primary conductors for two phases are connected to the corresponding partition terminals of the housing on the respective terminal sides, and the zero phase change is made from the bent portion. Since it is configured to be divided at positions closer to the inner diameter of the sink, it is possible to provide an earth leakage breaker capable of further improving assembly workability.

Further, according to claim 3 of the present invention, in claim 1 or 2, both primary conductors for two phases are divided on the side different from that to which the load is connected. It is possible to provide an earth leakage breaker capable of improving reliability as well as reliability.

According to a fourth aspect of the present invention, the zero-phase current transformer housed in the housing and formed in an annular shape around which the secondary winding is wound, and the annular portion of the zero-phase current transformer are provided. In a ground fault circuit breaker including a strip plate-shaped primary conductor that is respectively connected between terminals arranged at predetermined intervals through partition walls of the housing on both sides in the penetrating direction, a primary conductor of each phase, Since it is arranged so that the number of parts facing the zero-phase current transformer is equal, it is possible to provide the earth leakage breaker capable of improving the equilibrium characteristics.

[Brief description of drawings]

1 shows a configuration of a zero-phase current transformer of an earth leakage circuit breaker according to Embodiment 1 of the present invention, (A) is a plan view, (B) is a partially cutaway front view, (C). Is a side view.

FIG. 2 is a diagram showing a method of inserting the first primary conductor in FIG.

FIG. 3 is a diagram showing a method of inserting the second primary conductor in FIG.

FIG. 4 is a diagram showing a method of inserting the third primary conductor in FIG.

FIG. 5 shows a configuration of a zero-phase current transformer of an earth leakage circuit breaker according to Embodiment 2 of the present invention, (A) is a plan view, (B) is a partially cutaway front view, and (C). , (D) are side views of the main part.

FIG. 6 is a plan view showing the configuration of a conventional zero-phase current transformer of an earth leakage circuit breaker.

FIG. 7 is a front view showing the structure of a zero-phase current transformer of the earth leakage circuit breaker in FIG. 6 with a part broken away.

8 is a side view showing the configuration of a zero-phase current transformer of the earth leakage breaker in FIG.

FIG. 9 is a diagram for explaining that it is difficult to insert the primary conductor in FIG.

[Explanation of symbols]

11 zero-phase current transformer, 12, 22 first primary conductor, 12
c, 14c division part, 13 partition wall, 14, 23 second
Primary conductor, 15, 24 Third primary conductor.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Miyake Nobuaki             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. (72) Inventor Junichi Ota             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. (72) Inventor Kanehiro Kawakami             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. (72) Inventor Ryasu Baba             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. F-term (reference) 5G030 XX12 YY03

Claims (4)

[Claims] 1. A zero-phase current transformer, which is housed in a housing and has a secondary winding wound around an annular shape, and the housing, which penetrates an annular portion of the zero-phase current transformer, on both sides in the penetrating direction. Connected between each terminal arranged at a predetermined interval through the partition wall of the body,
In addition, in the earth leakage circuit breaker provided with strip-shaped primary conductors, both ends of which are outside two phases are bent from the penetrating portion and are respectively arranged parallel to the side surfaces of the zero-phase current transformer, Both of the primary conductors are divided at a predetermined position on one end side which is arranged in parallel with the side surface of the zero-phase current transformer. 2. Both primary conductors for two phases are divided at the corresponding terminal side from the partition wall of the housing and at a position closer to the inner diameter of the zero-phase current transformer from the bent portion. The earth leakage breaker according to claim 1. 3. The earth leakage breaker according to claim 1, wherein the two primary conductors for the two phases are divided on the side different from the side to which the load is connected. 4. A zero-phase current transformer, which is housed in a housing and formed in an annular shape around which a secondary winding is wound, and the housing which penetrates the annular portion of the zero-phase current transformer and is located on both sides in the penetration direction. In a ground fault circuit breaker comprising a strip plate-shaped primary conductor connected between terminals arranged at predetermined intervals via a partition wall of the body, the primary conductor of each phase is the zero-phase current transformer. An earth leakage circuit breaker, characterized in that it is arranged so that the number of parts facing each other is equal.