阅读说明：本技术 断路器 (Circuit breaker ) 是由 永野义隆 滨田哲也 铃木诚 于 2021-05-21 设计创作，主要内容包括：本发明所涉及的断路器(100a)具有：阻挡部(11a),其设置为将零序变流器(9)的至少一部分覆盖；以及框体,其由对零序变流器(9)及阻挡部(11a)进行收容的基座(1)和覆盖于基座(1)的罩(2)构成,阻挡部(11a)具有：主体部(14a),其设置于零序变流器(9)和负载侧端子(6b)之间；连接部(15a),其从主体部(14a)的一端起连续地将零序变流器(9)的罩(2)侧的面的至少一部分覆盖；以及缓和部(12a),其设置于连接部(15a),进行折弯以使得将罩(2)和零序变流器(9)之间的间隙填埋。(A circuit breaker (100a) according to the present invention includes: a blocking part (11a) arranged to cover at least a part of the zero sequence converter (9); and a frame body which is composed of a base (1) for accommodating the zero-sequence current transformer (9) and a blocking part (11a) and a cover (2) covering the base (1), wherein the blocking part (11a) is provided with: a main body part (14a) which is arranged between the zero-sequence current transformer (9) and the load-side terminal (6 b); a connecting part (15a) which continuously covers at least a part of the surface of the zero-sequence current transformer (9) on the side of the cover (2) from one end of the main body part (14 a); and a relaxation section (12a) that is provided in the connection section (15a) and that is bent so as to fill the gap between the cover (2) and the zero-sequence current transformer (9).)

1. A circuit breaker, having:

an opening/closing contact which is separated if an overcurrent flows;

a conductor connecting the opening/closing contact and the load side terminal;

a zero-sequence current transformer which is provided between the opening/closing contact and the load-side terminal and detects a leakage current from a current flowing through the conductor;

a blocking part arranged to cover at least a part of the zero sequence converter; and

a frame body composed of a base for accommodating the opening and closing contact, the conductor, the zero sequence current transformer and the blocking part and a cover covering the base,

the blocking portion has:

a main body part disposed between the zero-sequence converter and the load side terminal;

a connecting portion that continuously covers at least a part of a surface of the zero-sequence current transformer on the cover side from one end of the main body portion; and

and a relaxation section provided in the connection section and bent so as to fill a gap between the cover and the zero-sequence current transformer.

2. The circuit breaker of claim 1,

the blocking portion has a support portion that is provided continuously at an end of the main body portion and covers at least a part of a side surface of a surface of the zero-sequence current transformer facing the main body portion.

3. The circuit breaker of claim 1 or 2,

further comprising:

a control device which outputs a signal for opening the opening and closing contacts if the value of the current detected by the zero-sequence current transformer is greater than or equal to a predetermined value; and

and an earth leakage tripping device which opens the opening/closing contact if receiving the signal outputted from the control device.

4. The circuit breaker of any one of claims 1 to 3,

the relief portion is bent so as to form a convex portion toward the cover side.

5. The circuit breaker of any one of claims 1 to 3,

the relief portion is bent so as to form a convex portion toward a surface of the base facing the cover.

6. The circuit breaker of any one of claims 1 to 3,

the relief portion has a plurality of stacked portions facing the cover side.

7. The circuit breaker of any one of claims 1 to 6,

the blocking portion further includes a facing portion that is provided continuously at an end of the connecting portion on the opening/closing contact side and faces the main body portion with the zero-sequence current transformer interposed therebetween,

a hook portion bent toward the main body portion is provided at an end portion of the facing portion on a surface side of the base facing the cover,

the hook portion has a hook member with the zero sequence converter between the surface of the base opposite to the cover and the zero sequence converter.

Technical Field

The present invention relates to a circuit breaker having a blocking portion arranged in a manner to cover a zero sequence converter.

Background

In a circuit breaker having a plurality of phases, arc gas is generated in the vicinity of an opening/closing contact after the circuit breaker is opened, and conductive scattered matter contained in the arc gas adheres to an insulating wall or the like in a range spanning between the phases. As a result, insulation between phases deteriorates.

Therefore, in the conventional circuit breaker, the leakage detecting module having the door-like case accommodating the zero-sequence current transformer is provided as a shielding wall between the circuit breaking mechanism portion and the abnormal current detecting element, thereby suppressing the adhesion of the arc gas to the abnormal current detecting element (for example, see patent document 1).

Patent document 1: japanese laid-open patent publication No. 6-012966

However, in the conventional circuit breaker as described above, in order to further suppress the arc gas from entering and adhering to the space between the cover and the case of the circuit breaker, it is necessary to provide a cover as a member different from the shield wall, that is, the case, so as to fill the space between the case and the cover. Further, arc gas may enter a gap formed by combining the case and the lid.

Disclosure of Invention

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a circuit breaker in which a shield wall and a cover are integrated, and a blocking portion having a relief portion bent in a gap between a cover and a zero-sequence current transformer is provided, whereby the number of components of the cover and the number of steps for installing the cover can be reduced, and the arc gas can be more effectively prevented from being entrained.

The circuit breaker of the invention comprises: an opening/closing contact which is separated if an overcurrent flows; a conductor connecting the opening/closing contact and the load side terminal; a zero-sequence current transformer which is provided between the open/close contact and the load side terminal and detects a leakage current from a current flowing through the conductor; a blocking part arranged to cover at least a part of the zero sequence converter; and a frame body composed of a base for accommodating the open/close contact, the conductor, the zero sequence current transformer and the blocking part, and a cover covering the base, wherein the blocking part comprises: a main body part arranged between the zero-sequence current transformer and the load side terminal; a connecting portion that continuously covers at least a part of a cover-side surface of the zero-sequence current transformer from one end of the main body portion; and a relaxation section provided in the connection section and bent so as to fill a gap between the cover and the zero-sequence current transformer.

ADVANTAGEOUS EFFECTS OF INVENTION

The invention provides a circuit breaker, wherein a shielding wall and a cover body are integrated, and a blocking part with a relaxation part bent in a gap between a cover and a zero-sequence current transformer is arranged, so that the number of components of the cover body and the operation process of arranging the cover body can be reduced, and the arc gas can be effectively prevented from winding.

Drawings

Fig. 1 is a schematic diagram showing an external appearance of a circuit breaker according to embodiment 1.

Fig. 2 is a diagram showing an internal structure of the circuit breaker according to embodiment 1.

Fig. 3 is a perspective view showing a state where a cover of the circuit breaker according to embodiment 1 is removed.

Fig. 4 is an example of a plan view showing a load side terminal, a junction, a conductor, and a stopper of the circuit breaker according to embodiment 1.

Fig. 5 is a side view showing a conductor and a stopper which connect a load side terminal and a junction of the circuit breaker according to embodiment 1.

Fig. 6 is an example of a diagram of a blocking portion that covers the zero-sequence current transformer in the circuit breaker according to embodiment 1.

Fig. 7 is a side view showing examples of various pattern shapes of the relief portion of the blocking portion of the circuit breaker according to embodiment 1.

Fig. 8 is an example of a diagram of a blocking portion included in the circuit breaker according to embodiment 2.

Detailed Description

Embodiment 1.

Fig. 1 is an example of a schematic diagram showing an external appearance of a circuit breaker 100a according to the present embodiment. As shown in fig. 1, the circuit breaker 100a according to embodiment 1 is covered on the outside with a cover 2 made of an insulating material. The portions where the earth leakage trip device 4, the power source side terminal 6a, and the load side terminal 6b exist are shown in a plurality of holes provided in the cover 2. The circuit breaker 100a according to the present embodiment is, for example, an earth leakage circuit breaker.

The left half of fig. 2 is a diagram showing an internal structure of the circuit breaker 100a in a state where the cover 2 of the circuit breaker 100a according to the present embodiment is removed. The right half of fig. 2 is an external view of the circuit breaker 100a according to the present embodiment, and the lower part shows an internal structure in a perspective view from the outside.

Fig. 3 is a perspective view showing a state where the cover 2 of the circuit breaker 100a according to the present embodiment is removed. The structure of the circuit breaker 100a will be described with reference to fig. 1 to 3.

As shown in fig. 1 to 3, the circuit breaker 100a includes a base 1 and a cover 2, and the base 1 and the cover 2 are combined, and the cover 2 covers the base 1 to form a housing. The base 1 accommodates an earth leakage trip device 4, an opening/closing contact 3, a conductor 5, a joint 7, an arc electrode 8, a zero sequence converter 9, a control device 10, and a blocking portion 11 a. The base 1 and the cover 2 are made of an insulating material.

The open/close contacts 3 are formed in the housing, and open and close currents flowing through the circuit divided into 3 phases, for example. The respective opening and closing contacts 3 are separated at the time of energization, thereby generating arc gas. Arc gas is generated, and thereby the conductive material is scattered. The opening/closing contact 3 is composed of, for example, a movable contact and a fixed contact.

The conductor 5 is, for example, linear, and connects the load-side terminal 6b and the open/close contact 3 provided corresponding to each of the 3 pieces. The conductor 5 may not be linear.

The power supply side terminal 6a is connected to a power supply side conductor (not shown) outside the circuit breaker 100a, and is provided on the base 1. The load side terminal 6b is connected to a load side conductor (not shown) outside the circuit breaker 100a, and is provided on the base 1.

Arc gas generated by opening each opening/closing contact 3 when energized is extinguished.

The earth leakage trip device 4 is provided between the power source side terminal 6a and the load side terminal 6b, and is connected to the opening/closing contact 3. The earth leakage trip device 4 opens the opening/closing contact 3 at the time of earth leakage, thereby operating the circuit breaker 100 a.

When an overcurrent is detected, the overcurrent tripping device housed in the base 1 opens the opening/closing contact 3.

The zero-sequence converter 9 is provided on the load-side terminal 6b side with respect to the earth leakage trip device 4. The power supply side of the zero-sequence current transformer 9 engages the base 1 and the cover 2, and the linear conductors 5 of each phase are separated into the respective phases and connected to the power supply side terminal 6 a. The load side of the zero-sequence current transformer 9 connects the conductors 5 provided separately to the load side terminals 6b provided corresponding to them. The zero sequence current transformer 9 detects a leakage current from the current flowing in the conductor 5.

The control device 10 is arranged between the zero sequence converter 9 and the base 1. The electronic circuit included in the control device 10 compares the value of the leakage current with a predetermined threshold value, and determines whether or not to perform the tripping operation of the electrical leakage tripping device 4. If the value of the leakage current is larger than or equal to the threshold value, the electronic circuit outputs a tripping signal used by the leakage tripping device 4 to start tripping action to the leakage tripping device 4. And if the value of the leakage current is smaller than the threshold value, not outputting a trip signal.

When the earth leakage trip device 4 receives the trip signal, it starts the trip operation to open the opening/closing contact 3.

The barrier 11a is provided to cover at least a part of the zero-sequence current transformer 9 fitted through a groove, a rib, or the like of the base 1. The dam portion 11a is an insulating sheet-like resin material and has a bent structure. The structure of the stopper 11a will be described later.

Fig. 4 is an example of a plan view showing the load side terminal 6b, the junction 7, the conductor 5, and the stopper 11a of the circuit breaker 100a according to the present embodiment. The conductor 5 connects the load side terminal 6b and the joint 7.

The load side terminal 6b is connected to the earth leakage trip device 4 via the joint 7. In the breaker 100a shown in fig. 4, the conductor 5 is bent and collected at one location, and penetrates through a through portion which is a hole opened from the surface of the zero-sequence current transformer 9 on the power source side terminal 6a side to the surface of the load side terminal 6b side.

Fig. 5 is an example of a side view showing the conductor 5 and the stopper 11a connecting the load side terminal 6b and the junction 7 of the circuit breaker 100a according to the present embodiment.

Fig. 6 is a diagram of an example of a barrier 11a that covers the zero-sequence current transformer 9 in the breaker 100a according to the present embodiment. Fig. 6(a) is a front view of the stopper 11 a. Fig. 6(b) is an oblique view of the stopper 11 a. Fig. 6(c) is a plan view of the stopper 11 a. Fig. 6(d) is a side view of the stopper 11 a.

The structure of the stopper 11a will be described with reference to fig. 4 to 6.

The stopper 11a is formed by bending a sheet-like resin material, and includes a relief portion 12a, a support portion 13a, a main body portion 14a, and a connecting portion 15 a. As shown in fig. 6(a) and (b), the stopper 11a has a space in the center of the body 14 a. The space is a hole shape of an escape shape for the conductor 5 to pass through.

The main body portion 14a is provided between the load side terminal 6b and the zero-sequence current transformer 9.

The connecting portion 15a continuously covers at least a part of the surface of the zero-sequence current transformer 9 on the cover 2 side from one end of the body portion 14 a.

The relaxation portion 12a is provided in the connection portion 15a, and is bent so as to fill a gap between the cover 2 and the zero-sequence current transformer 9.

The support portion 13a covers at least a part of a side surface of the zero-sequence current transformer 9 facing the main body portion 14 a.

The moderating portion 12a has elasticity by having a corrugated folded shape. The cover 2 restrains the zero-sequence current transformer 9 via the moderating portion 12a, thereby supporting the zero-sequence current transformer 9. The relief portion 12a of the stopper portion 11a according to the present embodiment is bent so as to form a convex portion toward the cover 2.

The support portion 13a is formed by bending a sheet-shaped resin material, and thus has elasticity. In the present embodiment, one support portion 13a is provided between one side surface of the zero-sequence current transformer 9 facing the main body portion 14a and the surface of the base 1 facing the one side surface. Another support 13a is arranged between the other side of the zero sequence converter 9 and the control device 10.

The blocking portion 11a presses the cover 2 against the relaxation portion 12a, thereby blocking the gap between the cover 2 and the zero-sequence current transformer 9 and suppressing the intrusion of the arc gas to the load-side terminal 6b side.

Here, the operation of the barrier 11a and its effect when the arc gas is generated will be described.

The moderating portion 12a expands so as to bury the gap of the zero-sequence current transformer 9 and the cover 2 if subjected to the pressure of the generated arc gas. As a result, the conductive scatterers contained in the arc gas can be prevented from entering the load side terminal 6 b.

Likewise, one support 13a is extended so as to bury one side of the zero sequence current transformer 9 and the gap of the base 1. The other support 13a is extended so as to fill the gap between the other side of the zero sequence converter 9 and the control device 10. As a result, the conductive scatterers included in the arc gas can be prevented from entering the zero-sequence current transformer 9 from the left and right sides.

Fig. 7 is a side view showing various pattern shapes of the relief portion 12a of the barrier 11a of the circuit breaker 100a according to the present embodiment.

The patterns of fig. 7(a) to (d) are only examples, and if the patterns have a bent shape such that the gap between the cover 2 and the zero-sequence current transformer 9 is filled, other patterns may be used.

In fig. 7(a), the relief portion 12a is bent so that the central portion thereof becomes a convex portion toward the surface of the base 1 facing the cover 2. The convex portion in fig. 7(a) is formed in a triangular shape in cross section, for example.

In fig. 7(b), the relief portion 12a is bent toward the cover 2 side to form a plurality of laminated portions, for example, 2-layered laminated portions.

In fig. 7(c), the relief portion 12a is bent so that the power source side terminal 6a side is recessed from the load side terminal 6b side.

In fig. 7(d), the relief portion 12a is bent so that the central portion thereof becomes a convex portion toward the base 1. The portion of fig. 7(d) is formed in a quadrangular shape in cross section, for example. The cross-sectional shape of the convex portion in fig. 7(a) and (d) is not limited to the above-described triangle or quadrangle, and may be any shape.

The barrier 11a, the base 1, the cover 2, the zero-sequence current transformer 9, and the controller 10 fill the gaps between the phases toward the load side terminal 6b, increase the fluid resistance of the arc gas, and improve the airtightness, thereby suppressing the intrusion of the arc gas.

In the present embodiment, the space between the cover 2 and the zero sequence current transformer 9 can be filled by providing the barrier 11a having the bent relief portion 12 a. Therefore, since there is no need to newly provide a member for the lid body, the number of components and the number of working steps can be reduced, and the assemblability can be improved.

Further, since the barrier portion 11a is integrated without a gap, the arc gas does not enter the gap, and the adhesion of the arc gas can be more effectively suppressed.

In addition, the number of components and the number of working steps are reduced, thereby reducing the cost.

The load side of the zero-sequence converter 9 is spatially separated from the opening/closing contact 3 side by the base 1 and the stopper 11a provided to cover the zero-sequence converter 9 provided on the base 1. As a result, the conductive scatterers contained in the arc gas at the time of the disconnection are less likely to propagate to the load side terminal 6b side of the zero-sequence converter 9, and the insulation deterioration between phases can be suppressed.

In the present embodiment, since the zero-sequence transformer 9 can be fixed to the cover 2 via the relief portion 12a, an absorber provided on the surface of the zero-sequence transformer 9 on the cover 2 side is not required to absorb the impact generated when the zero-sequence transformer 9 is directly pressed by the cover 2. Therefore, the number of working steps and the number of components can be reduced. Further, gaps in the absorber caused by the provision of the absorber do not exist, and the penetration of the conductive scattering objects can be suppressed.

In addition, in the manufacturing process of the breaker 100a, since the barrier 11a is provided between the zero-sequence current transformer 9 and the load-side terminal 6b, the cost for equipment modification is low, and the implementation is possible.

Further, since it is not necessary to provide a shielding wall separate from the base 1 between the phases in order to suppress deterioration of insulation between the phases, only the stopper 11a is required, and therefore, the number of working steps and the number of components can be reduced, and the assembling property can be improved.

Further, since the cover 2 fixes the zero-sequence current transformer 9 by the relaxation portion 12a of the suppression blocking portion 11a, it is possible to suppress the occurrence of abnormal noise due to vibration of the zero-sequence current transformer 9.

Further, although the earth leakage breaker is described in the present embodiment as an example of the breaker 100a, it may be a breaker having a function of detecting earth leakage and notifying the user of the earth leakage as another example.

Embodiment 2.

The difference between embodiment 1 and embodiment 2 is the shape of the stopper. In embodiment 1, the stopper portion is constituted by the main body portion, the support portion, the connection portion, and the relief portion, but in embodiment 2, the stopper portion is constituted by the main body portion, the support portion, the connection portion, the relief portion, and the opposing portion.

In the following, only the differences from embodiment 1 will be described, and descriptions of the same or corresponding parts will be omitted. The same or corresponding portions as those in embodiment 1 are denoted by the same reference numerals, and description thereof is omitted.

Fig. 8 is an example of a diagram of a blocking portion 11b included in the circuit breaker 100b according to the present embodiment.

The stopper 11b is composed of a main body 14b, a support 13b, a connecting portion 15b, a relief portion 12b, and an opposing portion 16 b.

The opposing portion 16b is provided continuously from the end of the connecting portion 15b on the side of the opening/closing contact 3, and faces the main body portion 14b with the zero-sequence current transformer 9 interposed therebetween. The facing portion 16b has a space in the center portion, similarly to the body portion 14b, through which the conductor 5 passes.

Further, a hook portion 17b bent toward the body portion 14b is provided at an end portion of the facing portion 16b on the surface side of the base 1 facing the cover 2. In this case, the hook 17b is provided to have a hook with the zero-sequence current transformer 9 between the surface of the base facing the cover 2 and the zero-sequence current transformer 9.

Therefore, in the present embodiment, the barrier 11b can fill the space between the cover 2 and the zero-sequence converter 9 by eliminating the gap between the cover 2 and the zero-sequence converter 9, as in embodiment 1. As a result, since there is no need to newly provide a member of the lid body, the number of components and the number of working steps can be reduced, and the assemblability can be improved.

Further, since the barrier portion 11b is integrated without a gap, the arc gas does not enter the gap, and the adhesion of the arc gas can be more effectively suppressed.

In addition, the number of components and the number of working steps are reduced, thereby reducing the cost.

In the present embodiment, since the zero-sequence transformer 9 can be fixed to the cover 2 via the relaxation portion 12b, an absorber provided on the surface of the zero-sequence transformer 9 on the cover 2 side is not required in order to absorb the impact generated when the zero-sequence transformer 9 is directly pressed by the cover 2. Therefore, the number of working steps and the number of components can be reduced. Further, gaps in the absorber caused by the provision of the absorber do not exist, and the penetration of the conductive scattering objects can be suppressed.

In addition, in the manufacturing process of the breaker 100b, since the barrier 11b is provided between the zero-sequence current transformer 9 and the load-side terminal 6b, the cost for equipment modification is low, and the implementation is possible.

Further, since it is not necessary to provide a shielding wall separate from the base 1 between the phases in order to suppress deterioration of insulation between the phases, only the stopper 11a is required, and therefore, the number of working steps and the number of components can be reduced, and the assembling property can be improved.

Further, since the cover 2 fixes the zero-sequence current transformer 9 by the relaxation portion 12b of the suppression blocking portion 11b, it is possible to suppress the occurrence of abnormal noise due to vibration of the zero-sequence current transformer 9.

In the present embodiment, by providing the counter portion 16b, it is possible to further suppress the adhesion of the conductor flying objects due to the generated arc gas to not only the load side terminal 6b but also the zero-sequence current transformer 9.

Further, by providing the hook 17b with a hook to the zero-sequence current transformer 9 between the surface of the base 1 facing the cover 2 and the zero-sequence current transformer 9, the rising of the barrier 11b due to the gas potential generated by the arc gas can be suppressed. Further, the end of the opposite portion 16b is provided between the zero-sequence current transformer 9 and the base 1, whereby the assembling property is improved.

In addition, the present invention can be modified, omitted, or combined with other known techniques as appropriate within the scope of the disclosure.

Description of the reference numerals

1 base

2 cover

3 switching contact

4 electric leakage tripping device

5 conductor

6a power supply side terminal

6b load side terminal

7 joint part

8 arc electrode

9 zero sequence converter

10 control device

11a, 11b stops

12a, 12b relief portion

13a, 13b support part

14a, 14b main body part

15a, 15b connecting part

16b opposite part

17b hook part

100a, 100b circuit breaker