KR20070113101A - Earth leakage breaker - Google Patents

Abstract

An earth leakage breaker is provided to secure the insulating length of a terminal conductor of each phase by having an insulating barrier member which supports the terminal conductors of each phase at isolated positions. An earth leakage breaker includes terminal conductors of R, T, S phases(2R,2S,2T), and a terminal conductor of a N phase(2N). The terminal conductors of the R, T, S phases have core penetrating parts which are curved and U-shaped, and are inserted and arranged along the inner peripheral part of a ring-shaped core of a zero phase current transformer(7). The terminal conductor of the N phase is separated into two conductive parts(2N-1a,2N-1b) which are divided into both front and rear sides of the ring-shaped core and are located not to be overlapped with a wiring path of the terminal conductors of the R, S, T phases. Connecting ends(2N-2) of the divided conductive parts are coupled to each other at the inner center of the ring-shaped core.

Description

Earth leakage breaker {EARTH LEAKAGE BREAKER}

Fig. 1 is a schematic structural diagram of an embodiment of the present invention applied to a four-pole earth leakage breaker, in which (a) is an exploded perspective view showing a state before assembling the main circuit terminal conductors of each phase to the image current transformer, and (b) is an assembled state. Floor plan.

Figure 2 is a perspective view of the configuration of the four-pole earth leakage breaker equipped with the assembly of Figure 1 (b) in the body case.

3 is a perspective view of (b) of FIG.

FIG. 4 is a cross-sectional view showing the arrangement of terminal conductors and insulation barriers of respective phases inserted into the annular core of the video current transformer in FIG. 3; FIG.

Fig. 5 is a perspective view showing an assembling step of assembling the rear-side split conductors of the R and T-phase terminal conductors and the N-phase terminal conductors to the annular core of the video current transformer from the state shown in Fig. 1A.

Fig. 6 is a perspective view showing an assembling step in which all the divided conductors of the assembling step N-phase terminal conductor of Fig. 5 are assembled and screwed together.

FIG. 7 is a perspective view showing a wiring structure of a main circuit terminal conductor applied to a three-pole earth leakage breaker using the terminal conductors of R, S, and T phases in FIG. 1 as common components; FIG.

8 is a plan view of FIG.

9 is a perspective view showing the assembling structure of the three-pole earth leakage breaker;

Fig. 10 is a plan view showing a conventional assembling structure of a main circuit terminal conductor assembled to a video current transformer of a three-pole earth leakage breaker;

FIG. 11 is a plan view showing an assembling structure of a main circuit terminal conductor applied to a 4-pole earth leakage breaker using the terminal conductor of FIG. 10 as a common component; FIG.

(Explanation of symbols for the main parts of the drawing)

1: body case of breaker

2R, 2S, 2T: Terminal conductors on R, S and T phases

2R-1, 2S-1, 2T-1: U-shaped conductor

2N: N-phase terminal conductor

2N-1a, 2N-1b: split conductor

2N) -2: Connection end

7: Current transformer

10: fastening screw

11, 12: square frame (insulation barrier)

Technical field

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth leakage circuit breaker applied to a low voltage distribution system, and more particularly, to a wiring structure of a main circuit conductor (primary conductor) for an image current transformer mounted in a circuit breaker.

Background technology

The earth leakage circuit breaker described in the head is equipped with a video current transformer which detects leakage current of the main circuit with the main circuit as the primary conductor, in addition to the overcurrent protection function components similar to the wiring breaker. The main circuit conductors connected to the load-side terminals of each pole arranged in the terminal block of the circuit board are connected through the ring-shaped core of the video current transformer and dragged therein.

In addition, there are three-pole leakage circuit breakers applied to three-phase three-wire circuits, and four-pole leakage circuit breakers applied to three-phase four-wire circuits, and the four-pole circuit breaker corresponds to the neutral line. Since the phase portion is added, the number of main circuit conductors (primary conductors) passing through the annular core of the image current transformer becomes one more than that of a three-pole breaker.

In this case, the terminal conductor penetrating through the annular core as the primary conductor of the video current transformer is used for the three-pole earth leakage breaker and the four-pole earth leakage breaker in order to reduce the component cost and to make the circuit breaker compact. The wiring structure which standardized and comprised the conductor into two types of expanded dimension components is known (for example, refer patent document 1).

Next, the assembling structure of the three-pole earth leakage breaker is taken as an example, and the wiring structures of the terminal conductors corresponding to the three poles and the four poles disclosed in Patent Document 1 are shown in FIGS. 10 and 11, respectively. do.

First, in FIG. 9, 1 denotes a main body case of a circuit breaker (the cover is omitted as a molded resin case), and 2R, 2S, and 2T are arranged left and right at the load side terminal block 1a of the main body case 1 to the inside of the case. Terminal conductors on each of R, S and T wired, 3 is the opening and closing mechanism part of the main circuit contact point, 4 is the arcuate device of the current interrupting part, 5 is the operation handle, 6 is the overcurrent exclusion device, 7 is the image Current transformer, 8 is a ground fault detection circuit, 9 is a trip coil unit, and as shown in FIG. 10, the conductors 2R-1, 2S-1, 2T- connected to the terminal part of the terminal conductors 2R, 2S, 2T of each phase are shown. 1) was bent into a U-shape and then routed through the annular core of the image current transformer 7 to the inside of the main body case 1, and the conductors 2R-1, 2S-1, and 2T of each phase were An overcurrent excluding device (bimetal heater) is connected to the rear end of -1).

Here, the terminal conductors 2R and 2S are U-shaped conductor components having opposite shapes in the same development dimensions, and are U-shaped conductors 2R-1 and 2S- at a portion penetrating the annular core of the image transformer 7. 1) is inserted and placed so as to face from the reverse direction. Further, the terminal conductor 2T sets the length of the conductor 2T-1 to be longer than the terminal conductors 2R and 2S, and overlaps the inside of the conductor 2S-1 in the same direction as the terminal conductor 2S. It is laid out to list.

On the other hand, in the wiring structure applied to the four-pole earth leakage breaker shown in FIG. 11, the N-phase terminal conductor 2N corresponding to the neutral wire of the three-phase four-wire circuit is added to the right end side of the terminal block 1a. It is. Here, the terminal conductors 2R and 2N arranged at both ends of the terminal block 1a include U-shaped conductor components whose shapes are reversed in the same developed dimensions as the terminal conductor 2T in FIG. 10, and the terminal conductors 2S. 2T, a conductor component having the same shape as the terminal conductors 2R and 2S in Fig. 10 is adopted, and the conductors 2R-1 and 2N-1 of the terminal conductors 2R and 2N are connected to the terminal conductors 2S and 2T. They are arranged so as to overlap inside the conductors 2S-1 and 2T-1.

Patent Document 1: Japanese Patent Laid-Open No. 6-215682 (Fig. 1, Fig. 2)

By the way, the wiring structure of the terminal conductor mentioned above has the same problem as the following description. That is, in Fig. 10, the conductor 2S-1 of the terminal conductor 2S and the conductor 2T-1 of the terminal conductor 2T overlap in and out in the conductor thickness direction at the annular core through portion of the image current transformer 7. In addition, in FIG. 11, the conductors of the terminal conductors 2R / 2S and 2T / 2N overlap each other in the conductor thickness direction. Therefore, the dimension (d) of the front-back direction occupied by the terminal conductor of each phase including the video current transformer 7 becomes large, and the other parts (overcurrent exclusion apparatus, opening / closing mechanism part, current interruption part, etc.) accommodated in the main body case 1 by that much increase. ) Is limited in securing a space for accommodating), thereby increasing the external size of the circuit breaker.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and an object thereof is to share parts of a terminal conductor at three poles and four poles with respect to a main circuit terminal conductor (primary conductor) on the load side inserted into a current transformer. It is an object of the present invention to provide an earth leakage circuit breaker that is improved so that compactness can be achieved by minimizing the depth dimension occupied by an assembly of a terminal conductor including a video current transformer.

In order to achieve the above object, according to the present invention, a multi-pole earth leakage breaker equipped with a contact opening / closing part of a main circuit and a video current transformer having a main circuit as a primary conductor is provided in the main body case. In the case where the terminal conductor is passed through the annular core of the video current transformer and wired into the main body case,

Except for the N-phase terminal conductor corresponding to the neutral line of the main circuit, the R, S and T-phase terminal conductors bend the core through portion in a U-shape, and then the image current transformer The N-terminal conductor is divided into two conductor parts, and the divided conductor parts are divided into the front and rear sides of the annular core, and the other R, S, and T phases are inserted and arranged along the inner circumference. Place them on the same plane with the positions so as not to overlap the wiring paths of the terminal conductors, and the connecting end portions are connected to each other back and forth at the inner circumferential center position of the annular core (claim 1). The wiring structure is configured in the same manner as in the following description.

(1) With respect to the N-phase terminal conductor described above, the connecting end portions of the divided conductor parts are screwed together at the inner circumferential side of the annular core of the video current transformer and connected to each other (claim 2).

(2) The terminal conductors of R, S, and T phases are used as common components of 3-pole and 4-pole specifications, and in the 4-pole breaker, the terminal portion of the N-phase conductor is parallel to the terminal portion of each of the R, S, and T phase conductors. To the left and right ends of the main body case terminal block so as to constitute (claim 3).

(3) An annular core of the video current transformer is provided with an insulating barrier member which is inserted into the core before and after and is supported at an isolated position between the respective phase terminal conductors (claim 4). Consists of a bisecting rectangular frame, and puts the rectangular frame in the front and rear of the annular core before and after the phase terminal conductors are assembled in the video current transformer to isolate and support the conductors of each phase. (Claim 5).

Implement the invention  Best form for

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described based on the Example shown to FIG. 1 thru | or FIG. In addition, in the figure of an Example, the member corresponding to FIGS. 9-11 is attached | subjected with the same code | symbol, and the description is abbreviate | omitted.

First, the wiring structure of the primary conductor applied to the video current transformer of the 4-pole earth leakage breaker is shown in FIGS. In this embodiment, with respect to the main body case 1 of the ground fault circuit breaker shown in Fig. 2, the terminal block 1a on the load side thereof has terminal conductors 2N, corresponding to N phases, R phases, S phases, and T phases in order from the left. 2R, 2S, and 2T are arranged, and a conductor connected to the terminal portion thereof is routed through the annular core of the video current transformer 7 and into the main body case.

Here, the terminal conductors 2R, 2S, and 2T corresponding to the R, S, and T phases are common components applicable to a three-pole earth leakage breaker, and each terminal conductor has a portion that penetrates the annular core of the image transformer 7. It is bent in a U shape. That is, the U-phase terminal conductor 2R and the T-phase terminal conductor 2T extend their transverse directions in the transverse direction from the terminal portion toward the image current transformer 7 from the terminal portion, It is bent in a U shape in the opposite direction to each other. In contrast, the S-phase terminal conductor 2S has its conductor 2S-1 extending in the longitudinal direction from the terminal portion and its intermediate portion is bent in a U-shape, and shown in FIGS. 1B and 3. In the assembled state shown, conductors 2R-1, 2S-1, and 2T-1 of each phase are arranged on the same plane.

On the other hand, the conductor of the N-phase terminal conductor 2N is divided into a conductor 2N-1a on the front side connected to the terminal portion and a conductor 2N-1b on the rear side, and the wiring path thereof. 3 is formed so as to bypass the upper side of the terminal conductors 2R, 2S so as not to overlap with the terminal conductors of R, S, and T phases before and after, and to be arranged on the same plane as the terminal conductors of the other phases in the assembled state. (See FIG. 1B). Further, tab-shaped connecting ends 2N-2 are formed at the ends of the split conductors 2N-1a and 2N-1b so as to be inserted into the core inner circumference of the video current transformer 7 and face each other. The screw hole through which the fastening screw 10 passes is opened in the plate surface of the opening.

In addition, in the illustrated embodiment, the image current transformer (I) is an insulating barrier member that separates and supports the terminal conductor of each phase inserted into the annular core of the video current transformer 7 at a predetermined position, separately from each terminal conductor component described above. Before and after 7), the rectangular frames 11 and 12 sandwiched in the annular core are prepared.

Next, the sequence of assembling work for assembling each of the above components to the video current transformer 7 will be described with reference to FIGS. 1A, 5 and 6. First, from the disassembled state of Fig. 1A, the terminal conductors 2R and 2T U-shaped conductors 2R-1 and 2T-1 are inserted into the annular core of the video current transformer 7 from left and right. . Next, the rear-side split conductor 2N-1b of the N-phase terminal conductor 2N is superimposed on the rear side of the annular core, and the connecting end 2N-2 is fitted into the inner circumferential center of the annular core. Subsequently, on the rear side of the split conductor 2N-1b, the rectangular frame 12 of the insulating barrier member is inserted into the inner circumference of the annular core to surround the connection end 2N-2 of the split conductor 2N-1b. All. The state of this assembly step is shown in FIG.

Next, on the front side of the video current transformer 7, the split conductor 2N-1a of the terminal conductor 2N is overlaid on the annular core, and the tab-shaped connecting end 2N-2 is inserted into the core inner circumference. At the ends of the connection ends 2N-2. Subsequently, the fastening screw 10 is screwed from the front to the butt portion of the connecting end 2N-2 to interconnect the split conductors 2N-1a on the front side and the split conductors 2N-1b on the rear side. . The state of this assembly step is shown in FIG.

From this assembling step, the U-shaped conductor 2S-1 of the S-phase terminal conductor 2S is then inserted into the gap remaining between the inner circumference of the annular core and the connecting end 2N-2, Finally, the assembled frame of FIG. 3 is completed by fitting the square frame 11 into the inner circumference of the annular core from the front.

Next, arrangement | positioning of the terminal conductor of each phase inserted in the annular core of the video current transformer 7, and the insulation barrier member are shown in FIG. As can be seen from this figure, the connecting end 2N-2 of the N-phase terminal conductor is located at the inner circumferential center of the annular core, and the conductors of each of R, S, and T phases surround the connecting end 2N-2. (2R-1, 2S-1, 2T-1) are arranged along the core inner circumference and left and right, and are separated by an insulating barrier member so that the conductors do not contact each other.

In the above-described assembly structure, as shown in Fig. 1B, the terminal conductors of the respective phases inserted into the video current transformer 7 and pulled on the front and rear sides thereof are arranged on the same surface without overlapping back and forth. Thereby, compared with the wiring structure shown in FIG. 11, the depth dimension d of the conductor containing an image transformer can be reduced.

In addition, although the N-phase terminal conductor 2N is arrange | positioned at the left end side of the main body case terminal block 1a shown in FIG. 2, in contrast to this, the N-phase terminal conductor 2N is reversely opposite to the right end of the terminal block 1a. It is also possible to arrange the load side terminals in the order of R, S, T, and N phases. In this case, the terminal conductor 2N is shaped like symmetry with the example shown.

Next, the primary conductor wiring structure of the image transformer 7 applied to the three-pole earth leakage breaker using the above-described R, S, T phase terminal conductors 2R, 2S, and 2T as common components is shown in FIGS. do. Also in this assembly structure, the depth dimension of a terminal conductor assembly is the same as the dimension (d) shown to Fig.1 (b).

According to the above configuration, when the terminal conductors of R, S, and T phases which are inserted into the annular core of the video current transformer and inserted into the three-pole earth leakage breaker are used as common components, and are applied to the four-pole earth leakage breaker, R, The wiring structure of S and T phase is employ | adopted as it is, and it can respond simply by adding an N-phase terminal conductor to this. In addition, since the N-phase terminal conductors are arranged so that the conductors of each phase are arranged on the same plane so that the conductors of the phases are arranged so as not to overlap the terminal conductors of the other phase in the conductor thickness direction, the depth of the wiring structure of the terminal conductor including the video current transformer occupies. The dimension can be kept to a minimum and the storage space of other functional parts mounted in the same main body case can be expanded.

In addition, the N-phase terminal conductor is divided into two conductor parts, placed at both front and rear sides of the annular core, and the connecting end is screwed against the inner circumference center of the annular core of the video current transformer, thereby assembling the terminal conductor. The insulating barrier member which improves the property and which is inserted into the inner circumferential hole of the core before and after the ring-shaped core of the image current transformer and supports it in the position which isolate | separated between terminal conductors of each phase is made to contact | connect the terminal conductor of each phase. It can be stably supported at a predetermined position without any concern, and the insulation creepage distance of each phase conductor terminal can be ensured.

Claims (5)

A multi-pole earth leakage circuit breaker equipped with a contact opening and closing part of a main circuit and a video current transformer having a main circuit as a primary conductor. The terminal conductor of each pole arranged in the load side terminal block of the main body case passes through an annular core of the video current transformer. In wiring in the body case, Except for the N-phase terminal conductors corresponding to the neutral line of the main circuit, the R, S, and T-terminal conductors are bent in a U-shape through the core through portions thereof, and then inserted into the image transformer along the inner circumference of the annular core. The N-phase terminal conductor is inserted and divided into two conductor parts, and the divided conductor parts are divided into the front and rear sides of the annular core so that the positions thereof are shifted so as not to overlap with the wiring paths of other R, S and T phase terminal conductors. The earth leakage breaker characterized by arranging on the same surface and then connecting the end portions thereof to each other at the inner circumferential center position of the annular core. The method of claim 1, An earth leakage circuit breaker, wherein the connecting end portions of the divided conductor parts of the N-phase terminal conductor are connected by screwing together at an inner circumferential side of an annular core of the video current transformer. The method of claim 1, The terminal conductors of R, S, and T phases are used as common components of 3-pole and 4-pole specifications.In a 4-pole specification breaker, the terminal part of the N-phase conductor is parallel to the terminal of each of the R, S, and T phase conductors. An earth leakage breaker, which is disposed at either end of the case terminal block. The method of claim 1, An earth leakage circuit breaker comprising an insulating barrier member which is inserted into the core before and after the ring-shaped core of the video current transformer and is supported at an isolated position between the respective phase terminal conductors. The method of claim 4, wherein An earth leakage circuit breaker comprising a rectangular frame in which an insulating barrier member is divided into front and rear, and the square frame is inserted into the inner circumference of the annular core before and after the respective phase terminal conductors are assembled in the video current transformer. .

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