JP3275441B2 - Earth leakage breaker - 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 of insulating a primary conductor in a zero-phase-sequence current transformer of an earth leakage circuit breaker.

[0002]

BACKGROUND ART FIG. 14, for example JP-A 3-233824
FIG. 1 is a cross-sectional view showing a conventional earth leakage breaker disclosed in
5 is a partial perspective view showing a zero-phase current detecting portion of FIG. 14. In the figure, 1 is a case made of a mold resin, 2
Is a cover, 3 is a fixed contact integrated with the terminal plate 3a on the power supply side, 4 is a movable contact that opens and closes with respect thereto,
5 is an opening / closing mechanism for opening and closing the movable contact 4, 6 is an overcurrent tripping mechanism that operates by detecting overload current and short-circuit current, and 7 is a heater conductor 6 a of the movable contact 4 and the overcurrent tripping mechanism 6. A fixed conductor 9 is connected to one end of the conductor, 9 is a conductor whose one end is tripped and brazed to the coil and the other end is integrally formed with a terminal plate 8, and 10 is a zero-phase current transformer having the conductor 9 as a primary conductor. The lead wire 10a is extended. Reference numeral 13 denotes a portal case accommodating an amplifying unit 11 for amplifying the secondary output of the zero-phase current transformer 10, and reference numeral 12 denotes an earth leakage trip mechanism which operates upon receiving the output of the amplifying unit 11.

An electric current flows from the terminal plate 3a to the terminal plate 8 via the fixed contact 3, movable contact 4, fixed conductor 7, heater conductor 6a, and primary conductor 9, and the fixed conductor 7 has a movable contact whose one end is opened and closed. The other end of the heater conductor 6a
And is fastened to the case 1 by screws 14.

The primary conductor 9 is formed in the illustrated shape for each of the R, S and T phases by punching and bending from a copper strip (9R and 9T are symmetrical), and an overcurrent tripping mechanism is provided. 6 and the heater conductor 6a are integrally joined by brazing. The heater conductor 6a and the fixed iron core 6d are
It is caulked by e. Although armature 6b are rotatably supported on the case 1 via the arm projecting to the left and right, between the armature 6b and the fixed iron core 6d is stretched a return spring 6c, clockwise armature 6b Figure 14 Is always energized.

When the primary conductor 9 is formed in a U-shape as described above,
Although zero-phase current detecting portion miniaturization of is the miniaturization of power load direction of the leakage breaker case 1 is reduced can be achieved so attained, electrical of the U-shaped primary conductor 9 and zero-phase current transformer 10
Insulation is a problem.

Therefore, in order to solve such a problem,
As shown in FIG. 16 , the primary conductor 9 was insulated by wrapping a tape 15 around the primary conductor 9 or by covering a heat-shrinkable synthetic resin by heat-shrinking (not shown).

[0007]

In the conventional earth leakage circuit breaker, as described above, in order to secure electrical insulation from the zero-phase current transformer 10 by the U-shaped primary conductor 9, the primary conductor 9
However, since the heat-shrinkable synthetic resin is covered with the heat-shrinkable synthetic resin, the taping operation and the heat-shrinkage operation are troublesome, resulting in poor workability.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and it is an object of the present invention to provide a highly reliable earth leakage circuit breaker having a large effect of insulating a primary conductor by a simple operation of only attaching a primary conductor insulating member. With the goal.

[0009]

An earth leakage circuit breaker according to the present invention is provided with a side insulating portion covering both side surfaces of a zero-phase current transformer, and a zero-phase current transformer provided on the both side insulating portions, respectively. Hole insulation part protruding toward the hole and inner surface of both side insulation parts
And a concave portion through which the left and right primary conductors pass, and a primary conductor insulating member. Further, an earth leakage circuit breaker according to the present invention, in shall plurality of primary conductors in the holes of the zero-phase current transformer is arranged in a horizontal row has been inserted through, placed over the U-shaped portion of the primary conductor Of rubber-based materials
All SANYO having a primary conductor insulation member made of a molded article,
The primary conductor insulating member is the U-shaped portion of the primary conductor
It is a U-shaped, almost tubular member with the same shape as
Tubular member is openable over its entire length inside its U-shape
Having a U-shaped outside of the primary conductor insulating member.
Each primary conductor inserted into the hole of the zero-phase current transformer by the surface
Are insulated .

[0010]

In the present invention, the primary conductor inserted into the hole of the zero-phase current transformer can be insulated by the hole insulating portion, the insulating partition portion, or the U-shaped outer surface of the primary conductor insulating member. It is only necessary to mount an insulating member.

[0011]

[Embodiment 1] One embodiment of the present invention will be described with reference to FIGS. 1 is a perspective view showing the vicinity of the 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 reference numerals are given to the same or corresponding parts as those of the conventional one, and the description is omitted.

In FIG. 1, reference numeral 16 denotes a primary conductor insulating member made of a molded product of an electric insulating material, and a pair of left and right plate-like side insulating portions 17a and 17 covering both side surfaces of the zero-phase current transformer 10, respectively.
b, and cylindrical hole insulating portions 18a, 18b provided on the inner surfaces of the both side insulating portions 17a, 17b, respectively, and projecting toward the hole 10a of the zero-phase current transformer 10. 1
Reference numerals 9a and 19b denote recesses provided on the respective inner surfaces of the insulating portions 17a and 17b on both sides 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.
7b is snapped. Reference numerals 21a and 21b denote inter-phase insulating ribs provided on the outer surfaces of the insulating portions 17a and 17b, respectively.

[0013] The zero-phase current transformer 10 is inserted between both side insulating parts 17a and 17b as shown in FIG. A two-hole insulating portion 18a fitted in the hole 10a of the zero-phase current transformer 10,
18b, the primary conductor 9S is inserted through the hole insulating portion 18b.
a, right and left primary conductors 9 in holes 10a on both sides of
R, 9T are inserted, and both side insulating parts 17a, 17
b is snapped 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.

In the state fixed in the case 1, the central primary conductor 9S is held in the hole insulating portions 18a and 18b and is insulated from the left and right primary conductors 9R and 9T. 9R, 9S, 9T are in a state where they are kept insulated from each other.

As shown in FIGS. 1 and 2, a recess 19a is provided.
That side insulating portion 17 a more zero-phase current transformer 10 is isolated from the terminal plate 8 side. Further, the interphase insulating ribs 21a provided on the outer surface of the side insulating portion 17a also isolate the poles of the primary conductors 9R, 9S, 9T . Further, the side surface insulating portion 17 more zero-phase current transformer 10 to the b having a recess 19b is isolated from the relay unit side. Furthermore , the poles of the primary conductors 9R, 9S, 9T are also isolated by the interphase insulating rib 21b provided on the outer surface of the side surface insulating portion 17b .

As in the above embodiment, both locking portions 20a, 20
If the insulating portions 17a and 17b on both sides are stopped by snapping of b, the mounting of the primary conductor insulating member 16 is easy, 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 soldered to the primary conductors 9R, 9S, 9T in the last step of unitization, assembly can be easily performed.

Embodiment 2 FIG. In the first embodiment, the cylindrical body is shown as the hole insulating portions 18a and 18b. However, as shown in FIGS. 5 and 6, for example, a hole 22a and a pair of U -shaped walls 23a protruding on both left and right sides of the hole 22a.
7 and 8, a hole 22b and a pair of parallel walls 23b protruding on both left and right sides of the hole 22b.
And the hole 22c as shown in FIGS.
And a T-shaped wall 23c projecting below the hole 22c.

Embodiment 3 FIG. Next, another embodiment of the present invention FIGS. 11 to 13 for. Figure 11 is a perspective view showing the periphery ZCT, 1
2 is a perspective view showing a primary conductor insulation member of FIG. 11, FIG. 13 is a perspective view showing an insulating tube 11, omitted the description are denoted by the same reference numerals in the conventional ones identical or corresponding parts . In the figure, reference numeral 28 denotes a primary conductor insulating member made of a molded product of a rubber-based material such as silicon rubber, which has a flat U-shape to be covered on U-shaped portions of left and right primary conductors 9R and 9T, and has a flat U-shape. Openable portion 28a over the entire inner surface of the portion
have. Reference numeral 29 denotes an insulating cylinder that covers the central primary conductor 9S, and may be made of the same material as the primary conductor insulating member 28.

A part 28a capable of opening the primary conductor insulating member 28
After covering the U-shaped portions of the left and right primary conductors 9R and 9T, and covering the insulating tube 29 on the central primary conductor 9S, inserting it into the hole of the zero-phase current transformer 10, the primary conductor insulating member 28 and Each primary conductor 9R, 9S,
9T is insulated and interphase insulated by the U-shaped primary conductor insulating member 28. In addition, even if there is no central insulating cylinder 29, each primary conductor 9R,
9S, 9T insulation is provided.

Embodiment 6 FIG . In each of the embodiments described above, the three-pole type has been described. However, the four-pole type and the two-pole type can be dealt with as they are or by slightly deforming them, and the same effect can be naturally obtained.

[0021]

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

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing a first embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a view of FIG. 2 as viewed from below.

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

FIG. 5 is a view for explaining another example of the hole insulating portion according to the present invention.
A summary perspective view of a fit.

FIG. 6 is a front view of FIG. 5;

FIG. 7 illustrates still another example of the hole insulating portion according to the present invention.
A summary perspective view of order.

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

FIG. 9 illustrates still another example of the hole insulating portion according to the present invention.
A summary perspective view of order.

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

FIG. 11 is a perspective view of a main part showing Embodiment 3 of the present invention.

FIG. 12 is a perspective view showing a primary conductor insulating member of FIG. 11;

FIG. 13 is a perspective view showing the insulating cylinder of FIG. 11;

FIG. 14 is a cross-sectional view showing a conventional one.

FIG. 15 is a perspective view of a main part showing a zero-phase current detection part of FIG. 14;

FIG. 16 is a perspective view of a main part showing a different conventional example.

[Explanation of symbols]

 DESCRIPTION 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 Hole of zero-phase current transformer 16 Primary conductor insulation member 28 Primary conductor insulation member 17a Side insulation part 17b Side insulation part 18a Hole insulating part 18b Hole insulating part 19a Depression 19b Depression 20a Locking part 20b Locking part 28a Openable part 29 Insulating cylinder

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-5-81995 (JP, A) JP-A-5-82006 (JP, A) JP-A-53-85338 (JP, A) JP-A-63-85338 184543 (JP, U) Japanese Utility Model Hei 2-92642 (JP, U) Japanese Utility Model 62-2754 (JP, Y1) Japanese Utility Model 62-26907 (JP, Y1) (58) Fields surveyed (Int. ⁷ , DB name) H01H 83/02

Claims (6)

(57) [Claims] And 1. A zero-phase side insulating part both side surfaces covering each current transformer, the hole insulating portion penetrating these sides the insulating portion provided on at least one with ZCT of holes, both sides the inner surface of the side insulation portions of at least the relay portion side of the insulating portion
Comprising a primary conductor insulating member set eclipse Te becomes a part of the primary conductor and a recess let through, the primary conductors inserted through the hole of the ZCT by the hole insulating portions insulate each said opposite sides of the zero-phase primary conductor is inserted through Ri by the surface insulating unit current transformer relay portion side, and the terminal plate
An earth leakage breaker characterized by being isolated from a side . 2. A side insulating portion covering both side surfaces of the zero-phase current transformer, a hole insulating portion provided on each of the two side insulating portions and projecting toward a hole of the zero-phase current transformer, and both side surfaces. A primary conductor insulating member comprising a concave portion provided on the inner surface of the insulating portion and through which the left and right primary conductors pass, wherein the hole insulating portion insulates the primary conductor inserted into the hole of the zero-phase current transformer, zero-phase current transformer primary conductor Ri by <br/> on both side surfaces insulating portion is inserted through having a recess relay portion side Contact
An earth leakage breaker characterized by being isolated from a terminal board side . 3. The earth leakage breaker according to claim 1, wherein the insulating portions on both sides are snapped. 4. The earth leakage breaker according to claim 1, wherein a terminal plate is provided at one end of the primary conductor by brazing. 5. An earth leakage circuit breaker in which a plurality of primary conductors are arranged in a horizontal line and inserted through a hole of a zero-phase current transformer, wherein a central axis of the hole of the zero-phase current transformer and said primary conductor are connected to each other. An earth leakage breaker having a primary conductor inserted in a hole of the zero-phase current transformer in a U-shape when viewed in a plane including a line of a plurality of primary conductors in a horizontal row, wherein the U-shaped primary conductor A primary conductor insulating member made of a molded article of a rubber-based material to be covered on the shaped portion, wherein the primary conductor insulating member is a U-shaped substantially tubular member having the same shape as the U-shaped portion of the primary conductor. However, this tubular member has an openable portion over its entire length inside the U-shape, and the primary-conductor insulating member has a U-shaped outer surface that is inserted through the hole of the zero-phase current transformer. An earth leakage breaker characterized by insulated conductors. 6. The earth leakage breaker according to claim 5, wherein an insulating cylinder is covered on the intermediate primary conductor.