JPH10321116A - Leakage current detecting structure of earth leakage breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the necessity of bending L-shaped conductors further after being inserted into a through hole of a zero phase current transformer, and solve a problem such as an insulating member is damaged by sandwiching a ZCT to detect a leakage current by two unitized members by integrally molding plural conductors from a resin, and constituting so that the two unitized members are electrically connected to each other in a through hole of the ZCT. SOLUTION: Divided parts of a conductir R:1b, a conductor S:2b and a conductor T:3b are formed as the conductor R end lx, the conductor S end 2x and the conductor T end 3x formed into a shape fittable to the mutually opposing divided parts, and are molded into a single part by a resin B:8b while keeping a mutual clearance. After the conductor ends 1x, 2x and 3x and the conductor ends 1y, 2y and 3y are fitted and joined together by using, for example, an arc spot welder, a joining part is insulated by slicone and expoxy or the like. They can be fitted to a prescribed receptacle by an output pin 31p, and three conductors of RST can be always arranged in a fixed position. An insulating material can be omitted, and external appearance and insulating performance are also improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leakage current detecting structure for a leakage breaker including a zero-phase current transformer (abbreviated as ZCT) housed in a case of the leakage breaker and a conductor penetrating therethrough.

[0002]

2. Description of the Related Art A conventional zero-phase current transformer and a conventional assembling sequence of a conductor passing through a through hole of the zero-phase current transformer are shown in FIGS.
19. In FIG. 18, reference numeral 31b denotes a conductor R in which the output line 31s is covered with an insulating material 40 such as vinyl and silicon.
After bending the conductor 34, the conductor S35, and the conductor T36 at right angles, one end 34m of the conductor R, one end 35m of the conductor S, and one end 36m of the conductor T pass through the through-hole of the zero-phase current transformer 31b with the output line 31s.

FIG. 19 shows respective conductors R, S, and R of FIG.
One end 34m, 35m, 36m of T is further bent to form a U-shape, and the zero-phase current transformer 31b and the respective conductors 34, 3
5 and 36 have been assembled.

[0004]

In the above-mentioned prior art, the L-shaped conductor, which is a separate component from the zero-phase current transformer, needs to be bent after passing through the through-hole of the zero-phase current transformer. The following disadvantages have occurred. When bending the conductor, the insulation could be damaged or broken. When bending a conductor penetrating a zero-phase current transformer, the zero-phase current transformer hindered processing, and the conductor sometimes did not conform to dimensions.

[0005] Since the position of the conductor passing through the zero-phase current transformer is not constant, the position of other components connected to both ends of the conductor cannot be fixed in advance. Since the position of each conductor passing through the zero-phase current transformer is not stable, the voltage generated in the zero-phase current transformer when a current flows through the conductor is different, and the equilibrium characteristics are varied. An object of the present invention is to provide a structure in which a conductor can be easily assembled at a fixed position with respect to a zero-phase current transformer.

[0006]

According to the present invention, there is provided a ZCT for detecting a leakage current, a unitized member formed by integrally molding a plurality of conductors with a resin, and a plurality of conductors integrally formed by a resin. The other unitized member, and the one unitized member and the other unitized member form the ZCT
And a conductor of one unitized member and a conductor of the other unitized member are electrically connected in the through hole of the ZCT.

According to a second aspect of the present invention, in the first aspect, the ZCT is formed integrally with one of the unitized members. A third aspect of the present invention is the structure according to the first or second aspect, wherein the conductor of one unitized member and the conductor of the other unitized member are connected by fitting and joining in a through hole of the ZCT. .

According to a fourth aspect of the present invention, in the first, second and third aspects, the conductor of one unitized member and the conductor of the other unitized member are connected via a separate member in the through hole of the ZCT. It is the structure which did. The invention of claim 5 is the invention of claim 4
In another embodiment, the separate member has a conductor structure in which a plurality of ends insulated in the through hole have round rod shapes.

According to a sixth aspect of the present invention, there is provided the structure according to the fifth aspect, wherein a conductor having a plurality of round end portions is integrally formed of resin. According to a seventh aspect of the present invention, in the resin according to the sixth aspect, the resin formed by integrally molding a plurality of conductors having round rod ends has a guide fitting portion formed on the outer periphery, and the other party has a corresponding guide. This is a structure in which the fitting portions are formed.

According to an eighth aspect of the present invention, in any one of the first to seventh aspects, the output line of the ZCT has a structure in which an output pin fitted to an outlet is formed integrally with the ZCT.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention divides a plurality of conductors, two, three or four, of a through portion of a zero-phase current transformer into two or three conductors so that they can be fitted and joined there. Then, each set is made into a part by using resin molding, and a conductor is fitted and joined at a through portion of the zero-phase current transformer. Hereinafter, the number of conductors will be described as three.

[0012]

【Example】

Example 1 FIGS. 2 and 3 are perspective views of two parts formed by resin molding according to an example of the present invention. In FIG. 2, the conductors R1a, R1a, which correspond to the conductor fragments 34, 35, 36 of FIG.
The conductor R end 1x, the conductor S end 2x, and the conductor T, in which the divided portions of the conductor S2a and the conductor T3a can be fitted with the divided portion of FIG.
End 3x, the zero-phase current transformer 31a and this output pin 31p
At the same time, the resin A8a is used to form one part while maintaining a mutual gap.

In FIG. 3, the conductors 34, 35,
The conductor R1b, the conductor S2b, and the conductor T3b, which correspond to the other segments of the conductor 36, are formed into conductor R ends 1y, S ends 2y, and conductor T ends 3y that can be fitted with the divisions in FIG. The resin B8b is used to form one part while maintaining the same. FIG. 1 is an assembled perspective view of the present invention. Here, the description of the members having the same symbols as those in FIGS. 2 and 3 is omitted. In the figure, the conductor ends 1x, 2x, 3x of FIG. 2 and the conductor end 1 of FIG.
After fitting y, 2y, 3y and joining them by precision welding or soldering using, for example, an arc spot welding machine,
Insulate the joint with silicon or epoxy. This structure can achieve the same function as that of FIG.
The p allows the unit to be fitted into a given outlet and the three conductors of the RST to be always in place.

Embodiment 2 In another embodiment of the present invention, an assembling structure of two resin-molded parts and a zero-phase current transformer is shown in FIG.
FIG. 5 shows the completed drawing. In FIG. 4, conductors R4a and R4b, conductors S5a and S5b, conductors T6a and T6b perform the same functions as conductors 34, 35 and 36 in FIG. 18 in FIG. Each end 4x, 5x, 6x of a conductor is the same end 4y, 5y, 6y
It is a structure that can fit and join with.

In this configuration, the conductor R having the conductor R end 4x has
4a, a conductor S5a having a conductor S end 5x, and a conductor T end 6
x is integrally formed of resin A9a while maintaining a gap between the conductors T6a.
b, a conductor S5b having a conductor S end 5y, and a conductor T end 6y
A certain conductor T6b is molded with the resin B9b while maintaining a gap therebetween, and is combined with the zero-phase current transformer 11b with the output line 11s to obtain the state shown in FIG.

The fitted conductor R end 4x and conductor R end 4y,
Then, after the conductor S end 5x and the conductor S end 5y and the conductor T end 6x and the conductor T end 6y are joined by welding or soldering, the joint is insulated with silicon or epoxy. This structure
The same function as in FIG. 18 can be obtained, and the positional accuracy of the conductors of the unit can be significantly improved as compared with FIG.

Embodiment 3 In the embodiment of the present invention, FIG. 6 shows an assembling structure of a resin-molded two part and a center conductor 11m having a round shaft at both ends, and FIG. FIG. 8 shows a rear perspective view. FIG. 6 shows a zero-phase current transformer 31.
a, output pin 31p of zero-phase current transformer 31a, conductor R11
a, a conductor S12a, and a conductor T13a are integrated with a resin A18a, and a unit formed so that the central conductor 11m inside the zero-phase current transformer 31a is housed in an insulated state; To resin B18
b and the three central conductors 11
1 shows a state where m is assembled. Then, the three types of parts, particularly, both ends of the central conductor 11m are fitted to each other, and FIGS.
Then, both ends of the central conductor 11m are joined and insulated with silicon or the like. This structure can obtain the same function as that of FIG. 18, and can significantly improve the positional accuracy of the conductors of the unit as compared with FIG.

Embodiment 4: In the embodiment of the present invention, FIG. 9 shows a structural view of three parts molded by resin and a central conductor 11m, FIG. 9 shows a front perspective view of a completed view, and FIG. As shown in FIG. FIG. 9 shows a conductor R11a and a conductor S1.
2a, a unit in which the conductor T13a is integrated with a resin A19a, an output pin 31p, and a zero-phase current transformer 31
c, a unit in which a conductor R11b, a conductor S12b, and a conductor T13b are integrated by a resin B18b, and a three-phase center. This shows a state where the conductor 11m is assembled.

The four types of parts, especially the central conductor 11m
10 and 11 are fitted to each other, and then both ends of the central conductor 11m are joined and insulated with silicon or the like. This structure can obtain the same function as that of FIG. 18, and can significantly improve the positional accuracy of the conductors of the unit as compared with FIG. Embodiment 5: In the embodiment of the present invention, an assembling structure of a resin-molded three-part structure diagram is shown in FIG. 12, a front perspective view of a completed view, and a rear perspective view of FIG. FIG.
Are the zero-phase current transformer 31a and the output pin 3 of the zero-phase current transformer 31a.
1p, conductor R21a, conductor S22a, conductor T2 (not shown)
3a is integrated with resin A28a, and its zero-phase current transformer 31
a unit molded into a shape having a fitting portion 28h fitted with the resin F27 having a fitting portion 27h inside the
The conductor R11b, the conductor S12b, and the conductor T13b are made of resin B1.
8b and three central conductors 1
Resin F2 unitized with 1m and fitted with 27h
7 shows an assembled state.

The three types of parts, especially the central conductor 11m
13 and 14 are fitted to each other, and then both ends of the central conductor 11m are joined and insulated with silicon or the like. With this structure, the same function as that of FIG. 18 can be obtained, the center conductor 11m can be easily fitted, and the positional accuracy of the conductors of the unit can be significantly improved as compared with FIG.

Embodiment 6: In the embodiment of the present invention, the assembled structure of the three-part resin-molded structural drawing is shown in FIG.
FIG. 16 is a front perspective view of the completed drawing, and FIG.
Shown in FIG. 15 shows a state in which the center conductor 11m is joined to a corresponding portion of the conductor R24a, the conductor S25a, and the conductor T26a (not shown) such as the conductor ends 11x and 12x in FIG. 8 and integrated with the fitting portion 29h by the resin A29a. A unit and a zero-phase current transformer 31d which is provided with an output pin 31p, and is formed into a shape with a fitting portion 31h in which the outer periphery of the resin A29a around the central conductor 11m is housed inside the zero-phase current transformer 31d. , Conductor R11b, conductor S12b, conductor T13
2 shows a state in which a unit b is integrated with a resin B18b.

The three types of parts, especially the central conductor 11m
16 and 17 are fitted to each other, and then one end of the central conductor 11m is joined and insulated with silicon or the like. This structure can obtain the same function as that of FIG. 18, and can significantly improve the positional accuracy of the conductors of the unit as compared with FIG.

[0023]

According to the present invention, since resin molding is used without using the insulating material 40 and without bending the conductor at the time of assembly, the insulating material can be omitted, and the appearance quality and the insulation performance between the conductors can be reduced. Since the position of the conductor can be fixed at an ideal position with respect to the zero-phase current transformer, the balance characteristic is improved.

Further, according to the first aspect of the present invention, the case of the zero-phase current transformer can be omitted, and the number of parts can be further reduced. Further, in the inventions according to claims 5 and 6, since the fitting is performed by the round shaft, the work is easy and the number of steps can be reduced. According to the seventh aspect of the present invention, since the guide is provided at the resin fitting portion of the plurality of conductors, the number of steps can be further reduced.

Further, according to the invention of claim 8, each conductor can be always fixed when the output pin of the zero-phase current transformer is fitted into a predetermined outlet.

[Brief description of the drawings]

FIG. 1 is an assembled perspective view of Embodiment 1 of the present invention.

FIG. 2 is a perspective view of a divided conductor part integrated with the zero-phase current transformer according to the first embodiment of the present invention.

FIG. 3 is a perspective view of another divided conductor part according to the first embodiment of the present invention.

FIG. 4 is an assembly diagram of a zero-phase current transformer and a divided conductor part according to a second embodiment of the present invention.

FIG. 5 is an assembled perspective view of Embodiment 2 of the present invention.

FIG. 6 is an assembled perspective view of Embodiment 3 of the present invention.

FIG. 7 is an assembled perspective view of a third embodiment of the present invention after fitting.

FIG. 8 is a rear perspective view of FIG. 7;

FIG. 9 is an assembled perspective view of Embodiment 4 of the present invention.

FIG. 10 is an assembled perspective view of the fourth embodiment after fitting.

FIG. 11 is a rear perspective view of FIG. 10;

FIG. 12 is an assembled perspective view of Embodiment 5 of the present invention.

FIG. 13 is an assembled perspective view of Embodiment 5 of the present invention after fitting.

14 is a rear perspective view of FIG.

FIG. 15 is an assembled perspective view of Embodiment 6 of the present invention.

FIG. 16 is an assembled perspective view of Embodiment 6 of the present invention after fitting.

FIG. 17 is a rear perspective view of FIG. 16;

FIG. 18 is a perspective view of the first half of assembling a zero-phase current transformer and a conductor.

FIG. 19 is a perspective view of a zero-phase current transformer and conductor assembly.

[Explanation of symbols]

1a ... conductor R, 1b ... conductor R, 1x ... conductor R end, 1y ...
Conductor R end, 2a conductor S, 3b conductor T, 4x conductor R
End, 5y: Conductor S end, 6a: Conductor T, 8a: Resin A, 1
1a: conductor R, 11m: central conductor, 13y: conductor T end,
23a: conductor T, 27: resin F, 31a: zero-phase current transformer,
34: conductor R, 40: insulating material

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshiaki Kawashima 1-1, Tanabe Nitta, Kawasaki-ku, Kawasaki, Kanagawa Prefecture Inside Fuji Electric Co., Ltd. (72) Inventor Makoto Ogasawara 1, Tanabe Nitta, Kawasaki-ku, Kawasaki, Kanagawa, Japan No. 1 Fuji Electric Co., Ltd.

Claims (8)

[Claims] 1. A ZCT for detecting a leakage current, one unitized member formed by integrally molding a plurality of conductors with a resin, and the other unitized member formed by integrally molding a plurality of conductors with a resin. The ZCT is sandwiched between the one unitized member and the other unitized member, and the conductor of the one unitized member and the conductor of the other unitized member are electrically connected in a through hole of the ZCT. A leakage current detection structure for an earth leakage breaker. 2. The leakage current detecting structure of an earth leakage breaker according to claim 1, wherein the ZCT is integrally formed with one of the unitized members. 3. A conductor according to claim 1, wherein the conductor of one unitized member and the conductor of the other unitized member are connected by fitting and joining in a through hole of the ZCT. Leakage current detection structure of earth leakage breaker. 4. A conductor according to claim 1, wherein the conductor of one unitized member and the conductor of the other unitized member are connected via another member in a through-hole of the ZCT. Leakage current detection structure of the earth leakage circuit breaker. 5. The leakage current detecting structure of a leakage breaker according to claim 4, wherein the separate members are round bar-shaped conductors, each of which is insulated in the through hole. . 6. A leakage current detecting structure for an earth leakage circuit breaker according to claim 5, wherein a conductor having a plurality of round bars at a plurality of ends is integrally formed of resin. 7. A resin-molded resin comprising a plurality of conductors each having a round bar-like end and having a guide-fitting portion formed on the outer periphery thereof. A leakage current detection structure for an earth leakage breaker, wherein a junction is formed. 8. The leakage of the earth leakage breaker according to claim 1, wherein the output line of the ZCT has an output pin fitted with the outlet formed integrally with the ZCT. Current detection structure.