JPH06310018A - Earth leakage breaker - Google Patents

Abstract

PURPOSE:To increase insulating effect of a primary conductor and improve reliability of an earth leakage breaker by installing a primary conductor insulating part in side face insulating parts which cover both side faces of a zero-phase current transformer. CONSTITUTION:A zero-phase current transformer 10 is inserted between both side insulating parts 17a, 17b. A primary conductor 9s is inserted in hole insulating parts 18a, 18b which are set in the hole 10a of the transformer 10 and while right and left primary conductors 9R, 9T being inserted in the hole 10a in both sides of the insulating parts 18a, 18b, the insulating parts 17a, 17b are fixed by snaps by both stopping parts 20a, 20b. The primary insulator 16 composed in this way is fixed in a case 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for insulating a primary conductor in a zero-phase current transformer portion of an earth leakage breaker.

[0002]

2. Description of the Related Art FIG. 19 shows, for example, JP-A-3-233824.
2 is a sectional view showing a conventional earth leakage breaker disclosed in Japanese Patent Publication No.
Reference numeral 0 is a perspective view of an essential portion showing a zero-phase current detection portion of FIG. In the figure, 1 is a case made of mold resin, 2
Similarly, 3 is a cover, 3 is a fixed contact that is integral with the terminal plate 3a on the power source side, 4 is a movable contact that opens and closes with respect to it,
Reference numeral 5 is an opening / closing mechanism that drives the movable contactor 4 to open and close, 6 is an overcurrent trip mechanism that operates by detecting overload current and short-circuit current, and 7 is a heater conductor 6a of the movable contactor 4 and the overcurrent trip mechanism 6. Is a fixed conductor for connecting to one end of the conductor, 9 is a conductor whose one end is brazed to the trip coil and the terminal plate 8 is integrally molded to the other end, and 10 is a zero-phase current transformer using the conductor 9 as a primary conductor. The lead line 10a is drawn out. Reference numeral 13 is a gate-shaped case accommodating the amplification section 11 for amplifying the secondary output of the zero-phase current transformer 10, and reference numeral 12 is an earth leakage trip mechanism which operates by receiving the output of the amplification section 11.

A current flows from the terminal plate 3a through the fixed contact 3, the movable contact 4, the fixed conductor 7, the heater conductor 6a and the conductor 9 to the terminal plate 8. The fixed conductor 7 has a movable contact whose one end opens and closes. 4 is in sliding contact with the heater conductor 6a, and the other end thereof is overlapped with the heater conductor 6a and fastened to the case 1 by a screw 14.

Further, the primary conductor 9 is formed into a shape shown in the drawings for each phase of R, S and T by punching and bending from a copper strip (9R and 9T are symmetrical), and an overcurrent trip mechanism. The heater conductor 6a of 6 is integrally joined by brazing. The heater conductor 6a and the fixed iron core 6d are the pins 6
It is crimped by e. The armature 6b is rotatably supported by the case 1 via the arms protruding left and right, but a return spring 6c is stretched between the armature 6b and the fixed iron core 6d, and the armature 6b is rotated clockwise in FIG. Is always energized.

When the primary conductor 9 is U-shaped in this way, the zero-phase current detecting portion can be downsized, so that the case 1 can be downsized and the leakage breaker can be downsized in the power supply load direction. The U-shaped primary conductor 9 makes the zero-phase current transformer 10 susceptible to magnetic influence.

Therefore, in order to solve such a problem,
The primary conductor 9 was insulated by winding the tape 15 around the primary conductor 9 as shown in FIG. 21, or by heat-shrinking a heat-shrinkable synthetic resin (not shown) to cover the primary conductor 9.

[0007]

In the conventional earth leakage circuit breaker, as described above, the primary conductor 9 is formed in the U-shaped primary conductor 9 in order to prevent the zero-phase current transformer 10 from being magnetically affected. Since taping is performed or heat-shrinkable synthetic resin is heat-shrinked for coating, there is a problem that taping work and heat-shrinking work take time and workability is poor.

The present invention has been made in order to solve the above problems, and it is possible to obtain a highly reliable earth leakage circuit breaker having a large primary conductor insulating effect by a simple work of mounting a primary conductor insulating member. With the goal.

[0009]

An earth leakage circuit breaker according to the present invention is provided with a side surface insulating portion that covers both side surfaces of a zero-phase current transformer, and a zero-phase current transformer provided on each side surface insulating portion. The primary conductor insulating member includes a hole insulating portion protruding toward the hole. Further, the earth leakage circuit breaker according to the present invention is one in which a plurality of primary conductors are arranged in a row in a hole of a zero-phase current transformer, and at least the zero-phase current transformer of an intermediate primary conductor except for the primary conductors on both end sides is arranged. A primary conductor insulating member is provided which has an insulating partition wall portion which covers the portion of the container which is inserted through the hole and is located between the primary conductors. Further, the earth leakage circuit breaker according to the present invention has a primary conductor which is inserted into the hole of the zero-phase current transformer in a planar U-shape, and has a planar U-shape covered with the U-shaped portion of the primary conductor. In addition, the primary conductor insulating member having an openable portion is provided on the entire length of the inner surface of the plane U-shaped portion.

[0010]

According to the present invention, the primary conductor inserted into the hole of the zero-phase current transformer can be insulated by the hole insulating portion of the primary conductor insulating member, the insulating partition wall, or the U-shaped outer surface. All that is required is to attach an insulating member.

[0011]

【Example】

Example 1. An embodiment of the present invention will be described with reference to FIGS. 1 is a perspective view showing the vicinity of a zero-phase current transformer, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a view of the figure from below, and FIG. 4 is an exploded perspective view showing a primary conductor insulating member of FIG. The same or corresponding parts as those of the conventional device are designated by the same reference numerals and the description thereof will be omitted.

In the figure, reference numeral 16 is a primary conductor insulating member made of a molded product of an electrically insulating material.
b, and cylindrical hole insulating portions 18a and 18b provided on the inner surfaces of the both side surface insulating portions 17a and 17b and projecting toward the hole 10a of the zero-phase current transformer 10. 1
Denoted at 9a and 19b are recesses provided on the inner surfaces of the insulating portions 17a and 17b on both side surfaces, respectively, to secure a space through which the left and right primary conductors 9R and 9T pass. Reference numerals 20a and 20b denote locking portions provided on both side insulating portions 17a and 17b, respectively. By locking one claw 20b, both side insulating portions 17a and 17b are provided.
Snap 7b. Reference numerals 21a and 21b are ribs for interphase insulation provided on the outer surfaces of both side insulating portions 17a and 17b, respectively.

The insulating portions 17a and 17b on both side surfaces are separated as shown in FIG. 4, and the zero-phase current transformer 10 is inserted between them. Both-hole insulating portions 18a fitted in the holes 10a of the zero-phase current transformer 10,
The primary conductor 9S is inserted into the inside of 18b, and the hole insulating portion 18
The left and right primary conductors 9 are provided in the holes 10a on both sides of a and 18b.
With R and 9T inserted, both side insulating parts 17a, 17
B is snapped on by both locking portions 20a and 20b.
The primary conductor insulating member 16 thus mounted is shown in FIGS.
Finally, it is fixed in the case 1 as shown in FIG.

Thus, in the state of being fixed in the case 1, the central primary conductor 9S is held in the hole insulating portions 18a, 18b and insulated from the left and right primary conductors 9R, 9T, so that three primary conductors are provided. 9R, 9S, and 9T are in a state of being held in an insulating state with respect to each other.

As shown in FIGS. 1 and 2, the side surface insulating portion 17a.
The zero-phase current transformer 10 is connected to the terminal plate 8 by the recess 19a.
The primary conductors 9R, 9S, and 9T are completely isolated from the adjacent poles, and the primary conductors 9R, 9S, and 9T are also completely isolated from the adjacent poles. In addition, the zero-phase current transformer 10 is isolated from the relay portion side by the side surface insulating portion 17b and the recess 19b thereof, and the primary conductors 9R, 9S, and 9T are also completely isolated from the adjacent poles. The electrodes are also separated by 21b.

As in the above embodiment, both locking portions 20a, 20
If both side insulating parts 17a and 17b are stopped by snap-fastening b, the primary conductor insulating member 16 can be easily attached, and the unit can be assembled into the state shown in FIG. 1 to facilitate the assembly. At this time, if the terminal plates 8 are brazed to the primary conductors 9R, 9S, 9T in the final step of unitizing, the assembly can be easily performed.

Example 2. In the first embodiment, the hole insulating portion 18
Although a cylindrical body is shown as a and 18b, for example, as shown in FIGS. 5 and 6, one formed with a hole 22a and a pair of U-shaped walls 23a protruding to the left and right sides of the hole 22a, FIG. As shown in FIG. 8, it comprises a hole 22b and a pair of parallel walls 23b projecting to the left and right sides of the hole 22b. As shown in FIGS. 9 and 10, the hole 22c and the T protruding below the hole 22c. It may be configured with the letter wall 23c.

Example 3. Next, another embodiment of the present invention will be described with reference to FIGS. 11 is a perspective view showing the vicinity of the zero-phase current transformer, FIG. 12 is a plan view of FIG. 11 (however, the zero-phase current transformer is a cross section), and FIG. 13 is an exploded perspective view of FIG.
FIG. 14 is a perspective view showing an assembling process, and the same or corresponding parts as those of the conventional one are designated by the same reference numerals and the description thereof will be omitted. In the figure, reference numeral 24 is a primary conductor insulating member made of a molded product of an electrical insulating material, which is a box-shaped insulating partition wall portion 24a for covering the central primary conductor 9S in the hole 10a of the zero-phase current transformer 10 and is connected to this. Left and right primary conductors 9R,
The bent portion 24b is bent to the 9T side.

From the disassembled state shown in FIG. 13, the left and right primary conductors 9R and 9T are connected to the zero-phase current transformer 10 as shown in FIG.
Of the zero-phase current transformer 1 in the direction of arrow 25 by covering the central primary conductor 9S with the primary conductor insulating member 24.
0 hole 10a. Figure 11 assembled in this way,
In the state shown in FIG. 12, the insulating partition wall portion 24a of the primary conductor insulating member 24 insulates each of the primary conductors 9R, 9S, 9T, and the bent portion 24b separates the relay conductor portion and provides interphase insulation.

Example 4. In Example 3 described above, FIG.
As shown in FIG. 11, when the corner member 26 made of a molded product of an electrically insulating material is provided, by covering the corner member 27 of each of the left and right primary conductors 9R and 9T shown in FIG. Isolation and interphase insulation are ensured.

Example 5. Next, another embodiment of the present invention will be described with reference to FIGS. 16 is a perspective view showing the vicinity of the zero-phase current transformer, FIG. 17 is a perspective view showing the primary conductor insulating member of FIG. 16, and FIG. 18 is a perspective view showing the insulating cylinder of FIG. Alternatively, the corresponding parts are designated by the same reference numerals and the description thereof is omitted. In the figure, 28 is a primary conductor insulating member made of a molded product of a rubber-based material such as silicone rubber, and has a planar U-shape and is covered with the U-shaped portions of the left and right primary conductors 9R and 9T. An openable portion 28a is provided along the entire length of the inner surface of the portion. Reference numeral 29 denotes an insulating cylinder that covers the central primary conductor 9S and may be made of the same material as that of the primary conductor insulating member 28.

A portion 28a capable of opening the primary conductor insulating member 28.
And the primary cylinders 9R and 9T are covered with U-shaped portions and the insulating cylinder 29 is covered with the central primary conductor 9S, and then inserted into the hole of the zero-phase current transformer 10, the primary conductor insulating member 28 and The insulating cylinder 29 allows the primary conductors 9R, 9S,
9T is insulated, and the primary conductor insulating member 28 is also U-shaped for interphase insulation. In addition, the insulating tube 29 at the center
Even if there is no primary conductor insulation member 28, each primary conductor 9
The R, 9S and 9T are insulated.

Example 6. In each of the above embodiments, the three-pole type has been described, but it is needless to say that the four-pole type and the two-pole type can be applied as they are or by slightly modifying them, and the same effect can be obtained.

[0024]

As described above, according to the present invention, it is possible to obtain a highly reliable one having a large primary conductor insulating effect by a simple operation only by mounting the primary conductor insulating member.

[Brief description of drawings]

FIG. 1 is a perspective view of essential parts showing a first embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a view of FIG. 2 seen from below.

4 is an exploded perspective view showing the primary conductor insulating member of FIG. 1. FIG.

FIG. 5 is a partial perspective view showing a second embodiment of the present invention.

FIG. 6 is a front view of FIG.

FIG. 7 is a partial perspective view showing a second embodiment of the present invention.

8 is a front view of FIG. 7. FIG.

FIG. 9 is a partial perspective view showing a second embodiment of the present invention.

FIG. 10 is a front view of FIG. 9.

FIG. 11 is a perspective view of a main part showing a third embodiment of the present invention.

FIG. 12 is a plan view of FIG. 11.

FIG. 13 is an exploded perspective view of FIG. 11.

FIG. 14 is a perspective view showing an assembling process.

FIG. 15 is a perspective view showing Embodiment 4 of the present invention.

FIG. 16 is a perspective view of a main part showing a fifth embodiment of the present invention.

17 is a perspective view showing a primary conductor insulating member of FIG.

FIG. 18 is a perspective view showing the insulating cylinder of FIG. 16.

FIG. 19 is a sectional view showing a conventional one.

20 is a perspective view of relevant parts showing a zero-phase change detection part of FIG. 19;

FIG. 21 is a main part perspective view showing a different conventional example.

[Explanation of symbols]

 1 Base 6a Heater conductor 8 Terminal board 9R Primary conductor 9S Primary conductor 9T Primary conductor 10 Zero-phase current transformer 10a Zero-phase current transformer hole 16 Primary conductor insulating member 24 Primary conductor insulating member 28 Primary conductor insulating member 17a Side insulating part 17b Side insulating portion 18a Hole insulating portion 18b Hole insulating portion 19a Recessed portion 19b Recessed portion 20a Locking portion 20b Locking portion 24a Insulating partition wall portion 24b Bent portion 28a Releasable portion 29 Insulating cylinder

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[Procedure amendment]

[Submission date] August 6, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

When the primary conductor 9 is U-shaped in this way, the zero-phase current detecting portion can be downsized, so that the case 1 can be downsized and the leakage breaker can be downsized in the power supply load direction. U-shaped primary conductor 9 and zero-phase current transformer 1
Zero electrical insulation is a problem .

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

[0007]

In the conventional earth leakage breaker, as described above, the U-shaped primary conductor 9 and the zero-phase current change.
In order to ensure electrical insulation from the container 10, the primary conductor 9 is taped or a heat-shrinkable synthetic resin is heat-shrinked and coated, so that the taping work and the heat-shrinking work are troublesome. There was a problem that workability was poor.

Claims (8)

[Claims] 1. A primary comprising a side surface insulating portion covering both side surfaces of the zero-phase current transformer, and a hole insulating portion provided on each side surface insulating portion and protruding toward a hole of the zero-phase current transformer. A ground fault circuit breaker comprising a conductor insulating member, wherein each of the primary conductors inserted into the hole of the zero-phase current transformer is insulated by the hole insulating portion. 2. The earth leakage breaker according to claim 1, wherein the hole insulating portion has a cylindrical shape, a T shape, and a parallel plate shape. 3. The earth leakage breaker according to claim 1, wherein recesses for passing the left and right primary conductors are provided on the inner surface of the side surface insulating portion to insulate the left and right primary conductors from the relay portion and the back terminal. 4. The earth leakage breaker according to claim 1, wherein both side insulating parts are snap-fastened. 5. The earth leakage breaker according to claim 1, wherein after the primary conductor is assembled with the primary conductor insulating member, the terminal plate is brazed to the primary conductor. 6. A structure in which a plurality of primary conductors are arranged in a row in a row in a zero-phase current transformer, wherein the primary conductors in the middle excluding the primary conductors at both ends are inserted into at least the holes in the zero-phase current transformer. And a primary conductor insulating member having an insulating partition wall portion that is located between the primary conductors and that is insulated from the primary conductors that are inserted into the holes of the zero-phase current transformer by the insulating partition wall portion. Earth leakage circuit breaker. 7. A zero-phase current transformer having a primary conductor inserted through a hole in a plane U shape, wherein the primary conductor has a plane U shape and is covered with a U shape portion. A primary conductor insulating member having a releasable portion over the entire length of the inner side surface of the ring-shaped portion, and the U-shaped outer surface of the primary conductor insulating member insulated the primary conductors inserted into the holes of the zero-phase current transformer. Characteristic earth leakage breaker. 8. The earth leakage breaker according to claim 7, wherein the intermediate primary conductor is covered with an insulating cylinder.