circuit breaker

Abstract

A circuit breaker (100a) according to the present application has a blocking portion (11a) configured to cover at least a portion of a zero sequence transformer (9), and a frame composed of a base (1) that houses the zero sequence transformer (9) and the blocking portion (11a), and a cover (2) that covers the base (1), the blocking portion (11a) having a main portion (14a) disposed between the zero sequence transformer (9) and a load side terminal (6b), a connecting portion (15a) that continuously covers at least a portion of a surface of the cover (2) of the zero sequence transformer (9) from one end of the main portion (14a), and a relief portion (12a) disposed at the connecting portion (15a) and bent so as to fill a gap between the cover (2) and the zero sequence transformer (9).

Description

TECHNICAL FIELD

[0001] The present application relates to a circuit breaker having a barrier portion provided in a manner covering a zero sequence transformer. BACKGROUND

[0002] In a circuit breaker having a plurality of phases, arc gas is generated in the vicinity of the opening and closing contact after the circuit is broken, and conductive flying objects contained in the arc gas adhere to an insulating wall or the like across the phases. As a result, the insulation between the phases deteriorates.

[0003] Therefore, in the conventional circuit breaker, an earth leakage detection module having a door-shaped housing that houses the zero sequence transformer is provided as a shielding wall between the circuit breaking mechanism portion and the abnormal current detection element, thereby suppressing the arc gas from adhering to the abnormal current detection element (see, for example, Patent Document 1).

[0004] Patent Document 1: Japanese Patent Application Publication No. H6-012966

[0005] However, in the conventional circuit breaker described above, in order to further suppress the arc gas from entering around and adhering through the space between the cover and the housing of the circuit breaker, a cover is required as a member different from the shielding wall, i.e., the housing, so as to fill the space between the housing and the cover. In addition, the arc gas sometimes enters the gap after the housing and the cover are combined. SUMMARY

[0006] The present application is proposed to solve the above-described problems, and aims to provide a circuit breaker in which a shielding wall and a cover are integrated, a barrier portion having a relaxation portion bent in the gap between a cover and a zero sequence transformer is provided, thereby enabling the number of components of the cover and the work process of providing the cover to be reduced, and the entry of arc gas to be more effectively suppressed.

[0007] The circuit breaker according to the present application has an opening and closing contact that is separated if an overcurrent flows, a conductor that connects the opening and closing contact and a load side terminal, a zero sequence transformer that is provided between the opening and closing contact and the load side terminal and detects an earth leakage current from a current flowing in the conductor, a barrier portion that is provided to cover at least a part of the zero sequence transformer, and a frame that is composed of a base that houses the opening and closing contact, the conductor, the zero sequence transformer, and the barrier portion, and a cover that covers the base, the barrier portion having a main portion that is provided between the zero sequence transformer and the load side terminal, a connecting portion that continuously covers at least a part of a surface of the zero sequence transformer from one end of the main portion, and a relaxation portion that is provided to the connecting portion and is bent so as to fill a gap between the cover and the zero sequence transformer.

[0008] EFFECTS OF THE INVENTION

[0009] The circuit breaker according to the present application is aimed at providing a circuit breaker in which a shielding wall and a cover are integrated, a blocking portion having a relief portion bent at a gap between a cover and a zero-sequence current transformer is provided, thereby enabling the number of components of the cover to be reduced and the work of installing the cover to be facilitated, and the entry of arc gas to be more effectively suppressed. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is a diagram showing the external appearance of the circuit breaker according to Embodiment 1.

[0011] Figure 2 is a diagram showing the internal structure of the circuit breaker according to Embodiment 1.

[0012] Figure 3 is a diagram showing the state of the circuit breaker according to Embodiment 1 after the cover is removed.

[0013] Figure 4 is an example of a plan view showing the load-side terminal, the joint portion, the conductor, and the blocking portion of the circuit breaker according to Embodiment 1.

[0014] Figure 5 is a side view showing the conductor and the blocking portion connecting the load-side terminal and the joint portion of the circuit breaker according to Embodiment 1.

[0015] Figure 6 is an example of a diagram of the blocking portion covering the zero-sequence current transformer in the circuit breaker according to Embodiment 1.

[0016] Figure 7 is an example of a side view showing various patterns of the shape of the relief portion of the blocking portion of the circuit breaker according to Embodiment 1.

[0017] Figure 8 is an example of a diagram of the blocking portion of the circuit breaker according to Embodiment 2. DETAILED DESCRIPTION

[0018] Embodiment 1.

[0019] Figure 1 is an example of a diagram showing the external appearance of the circuit breaker 100a according to the present embodiment. As shown in Figure 1 the circuit breaker 100a according to Embodiment 1 is covered on the outside by a cover 2 formed of an insulating material. The positions of a leakage trip device 4, a power source-side terminal 6a, and a load-side terminal 6b are shown in a plurality of holes provided in the cover 2. The circuit breaker 100a according to the present embodiment is, for example, a leakage circuit breaker.

[0020] Figure 2The left half of the diagram shows the internal structure of the circuit breaker 100a after the cover 2 of the circuit breaker 100a according to this embodiment has been removed. Figure 2 The right half is an external view of the circuit breaker 100a according to this embodiment, and the lower part shows the internal structure in a perspective view from the outside.

[0021] Figure 3 This is a perspective view showing the state after the cover 2 of the circuit breaker 100a according to this embodiment has been removed. (Using...) Figures 1 to 3 The construction of circuit breaker 100a is described.

[0022] like Figures 1 to 3 As shown, the circuit breaker 100a has a base 1 and a cover 2. The base 1 and the cover 2 are combined, and the cover 2 covers the base 1 to form a frame. The base 1 houses a residual current tripping device 4, a switching contact 3, a conductor 5, a junction 7, an arc electrode 8, a zero-sequence converter 9, a control device 10, and a blocking part 11a. In addition, the base 1 and the cover 2 are formed of insulating material.

[0023] The opening and closing contacts 3 are formed within the frame, for example, to open and close the current flowing in the circuit in three phases. Each opening and closing contact 3 is separated when energized, thereby generating an electric arc gas. The generation of the electric arc gas causes conductive materials to disperse. The opening and closing contacts 3 are, for example, composed of movable contacts and fixed contacts.

[0024] Conductor 5 may be straight, for example, and connected to three corresponding load-side terminals 6b and opening / closing contacts 3. Alternatively, conductor 5 may not be straight.

[0025] The power supply side terminal 6a is connected to the external power supply side conductor (not shown) of the circuit breaker 100a and is mounted on the base 1. The load side terminal 6b is connected to the external load side conductor (not shown) of the circuit breaker 100a and is mounted on the base 1.

[0026] It is configured to extinguish the arc gas generated when each of the open and closed contacts 3 is opened when energized.

[0027] The residual current trip device 4 is located between the power supply side terminal 6a and the load side terminal 6b, and is connected to the opening and closing contact 3. When a leakage occurs, the residual current trip device 4 opens the opening and closing contact 3, thereby causing the circuit breaker 100a to operate.

[0028] In addition, when an overcurrent is detected, the overcurrent trip device housed in the base 1 will open the opening and closing contact 3.

[0029] The zero-sequence current transformer 9 is provided on the load side terminal 6b side compared with the leakage trip device 4. The power source side of the zero-sequence current transformer 9 is engaged with the base 1 and the cover 2, and the linear conductors 5 of each phase are separated into each phase and connected to the power source side terminal 6a. The load side of the zero-sequence current transformer 9 connects each conductor 5 provided separately and the load side terminal 6b provided corresponding to each. The zero-sequence current transformer 9 detects the leakage current from the current flowing in the conductor 5.

[0030] The control device 10 is disposed between the zero-sequence current transformer 9 and the base 1. Further, the electronic circuit of 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 leakage trip device 4. The electronic circuit described above outputs a trip signal for starting the tripping operation of the leakage trip device 4 to the leakage trip device 4 if the value of the leakage current is greater than or equal to the threshold value. If the value of the leakage current is less than the threshold value, the trip signal is not output.

[0031] The leakage trip device 4 starts the tripping operation and opens the opening and closing contact 3 if the trip signal is received.

[0032] The blocking portion 11a is provided to cover at least a part of the zero-sequence current transformer 9 fitted with the groove and the ribs of the base 1 and the like. The blocking portion 11a is a sheet-shaped resin raw material having an insulating property, and has a bent configuration. The configuration of the blocking portion 11a will be described later.

[0033] Figure 4 is an example of a plan view showing the load side terminal 6b, the joint portion 7, the conductor 5, and the blocking portion 11a of the circuit breaker 100a according to the present embodiment. The conductor 5 connects the load side terminal 6b and the joint portion 7.

[0034] The load side terminal 6b is connected to the leakage trip device 4 via the joint portion 7. In Figure 4 In the circuit breaker 100a shown in the drawing, the conductors 5 are bent and gathered to one portion, and pass through the hole, that is, the through portion, which is left open from the surface on the power source side terminal 6a side of the zero-sequence current transformer 9 to the surface on the load side terminal 6b side.

[0035] Figure 5 is an example of a side view showing the conductor 5 connecting the load side terminal 6b and the joint portion 7 of the circuit breaker 100a according to the present embodiment and the blocking portion 11a.

[0036] Figure 6 is a drawing of an example of the blocking portion 11a covering the zero-sequence current transformer 9 in the circuit breaker 100a according to the present embodiment. Figure 6 (a) is a front view of the blocking portion 11a. Figure 6 (b) is an oblique view of the blocking portion 11a. Figure 6 (c) is a plan view of the blocking portion 11a.Figure 6 (d) is a side view of the barrier portion 11a.

[0037] Using Figures 4 to 6 The configuration of the barrier portion 11a will be described.

[0038] The barrier portion 11a is formed by bending a sheet-shaped resin raw material, and is composed of a relaxation portion 12a, a support portion 13a, a main body portion 14a, and a connecting portion 15a. As shown in (a) and (b) of FIG. 1, the barrier portion 11a has a space in the center of the main body portion 14a. The space is a gap-shaped hole shape for allowing the conductor 5 to pass through. Figure 6 (a) (b) indicates that the barrier portion 11a has a space in the center of the main body portion 14a. The space is a gap-shaped hole shape for allowing the conductor 5 to pass through.

[0039] The main body portion 14a is provided between the load side terminal 6b and the zero sequence current transformer 9.

[0040] The connecting portion 15a continuously covers at least a part of the surface of the cover 2 side of the zero sequence current transformer 9 from one end of the main body portion 14a.

[0041] The relaxation portion 12a is provided to the connecting portion 15a, and is bent so as to fill the gap between the cover 2 and the zero sequence current transformer 9.

[0042] The support portion 13a covers at least a part of the side surface of the surface of the zero sequence current transformer 9 opposite to the main body portion 14a.

[0043] The relaxation portion 12a is bent in a corrugated shape with a fold, and thus has elasticity. The cover 2 suppresses the zero sequence current transformer 9 via the relaxation portion 12a, and thus supports the zero sequence current transformer 9. The relaxation portion 12a of the barrier portion 11a according to the present embodiment is bent so as to become a convex portion toward the cover 2 side.

[0044] The support portion 13a is formed by bending a sheet-shaped resin raw material, and thus has elasticity. In the present embodiment, one support portion 13a is provided between one side surface of the surface of the zero sequence current transformer 9 opposite to the main body portion 14a and the surface of the base 1 opposite to the one side surface. Another support portion 13a is provided between the other side surface of the zero sequence current transformer 9 and the control device 10.

[0045] The barrier portion 11a pushes the cover 2 toward the relaxation portion 12a, and thus can block the gap of the cover 2 and the zero sequence current transformer 9, and suppress the invasion of the arc gas to the load side terminal 6b side.

[0046] Here, the action of the barrier portion 11a at the time of generation of the arc gas and its effects will be described.

[0047] If the pressure of the generated arc gas is received, the relaxation portion 12a expands so as to fill the gap of the zero sequence current transformer 9 and the cover 2. As a result, the winding of the conductive flying objects contained in the arc gas to the load side terminal 6b can be suppressed.

[0048] Similarly, one support portion 13a is extended so as to fill in the gap between one side surface of the zero-sequence current transformer 9 and the base 1. Another support portion 13a is extended so as to fill in the gap between the other side surface of the zero-sequence current transformer 9 and the control device 10. As a result, the electrically conductive flying objects contained in the arc gas can be suppressed from winding around the left and right of the zero-sequence current transformer 9.

[0049] Figure 7 is an example of a side view showing the shape of various patterns of the relief portion 12a of the blocking portion 11a of the circuit breaker 100a according to the present embodiment.

[0050] Figure 7 The patterns of (a) to (d) are only examples, and other patterns of shapes can also be used if the bending shape is such that the gap between the cover 2 and the zero-sequence current transformer 9 is filled in.

[0051] In Figure 7 In (a), the relief portion 12a is bent in such a way that the central portion becomes a convex portion toward the face of the base 1 opposite the cover 2. Figure 7 The convex portion of (a) is formed, for example, in a triangular shape in cross-sectional shape.

[0052] In Figure 7 In (b), the relief portion 12a is bent in such a way that the side toward the cover 2 is a plurality of stacked portions, for example, having two layers of stacked portions.

[0053] In Figure 7 In (c), the relief portion 12a is bent in such a way that the side of the power source side terminal 6a is recessed compared to the side of the load side terminal 6b.

[0054] In Figure 7 In (d), the relief portion 12a is bent in such a way that the central portion becomes a convex portion toward the side of the base 1. Figure 7 The portion of (d) is formed, for example, in a quadrangular shape in cross-sectional shape. Further, Figure 8 The cross-sectional shape of the convex portion of (a), (d) is not limited to the above-described triangular shape or quadrangular shape, and can be any shape.

[0055] By filling in the gap between the blocking portion 11a, the base 1, the cover 2, the zero-sequence current transformer 9, and the control device 10 toward the side of the load side terminal 6b, the fluid resistance of the arc gas is increased and the gas tightness is improved, thereby suppressing the intrusion of the arc gas.

[0056] In the present embodiment, by providing the blocking portion 11a having the relief portion 12a bent, the space between the cover 2 and the zero-sequence current transformer 9 can be filled in. Therefore, there is no need to newly provide a member of the cover, and thus the number of members and the number of work processes are reduced, and the assembly can be improved.

[0057] In addition, the blocking portion 11a is integrated without a gap, and thus arc gas does not enter the gap, and the attachment of arc gas can be more effectively suppressed.

[0058] Further, the number of components and the number of work processes are reduced, and thus the cost can be reduced.

[0059] By the blocking portion 11a and the base 1 provided in a manner of covering the zero-sequence current transformer 9 provided on the base 1, the load side of the zero-sequence current transformer 9 is spatially separated from the side of the opening and closing contact 3. As a result, conductive flying objects contained in arc gas at the time of breaking are less likely to spread to the load side terminal 6b side of the zero-sequence current transformer 9, and the deterioration of insulation between phases can be suppressed.

[0060] In the present embodiment, the cover 2 can fix the zero-sequence current transformer 9 via the relaxation portion 12a, and thus there is no need to provide an absorber on the surface of the zero-sequence current transformer 9 on the cover 2 side in order to absorb the impact generated by directly pressing the zero-sequence current transformer 9 by the cover 2. Thus, the reduction of the number of work processes and the number of components can be achieved. In addition, there is no gap of the absorber due to the provision of the absorber, and the entry of conductive flying objects can be suppressed.

[0061] In addition, in the manufacturing process of the circuit breaker 100a, since the blocking portion 11a is provided between the zero-sequence current transformer 9 and the load side terminal 6b, the equipment modification cost is small, and the realization can be achieved.

[0062] In addition, there is no need to provide a shielding wall separate from the base 1 between the phases in order to suppress the deterioration of insulation between the phases, and only the blocking portion 11a is sufficient, and thus the number of work processes and the number of components can be reduced, and the assembly property is improved.

[0063] In addition, the cover 2 fixes the zero-sequence current transformer 9 by suppressing the relaxation portion 12a of the blocking portion 11a, and thus the emission of abnormal noise due to the vibration of the zero-sequence current transformer 9 can also be suppressed.

[0064] In addition, as an example of the circuit breaker 100a, a residual current circuit breaker is described in the present embodiment, but as another example, it can also be a circuit breaker having a function of detecting a residual current and notifying a user.

[0065] Embodiment 2

[0066] The difference between Embodiment 1 and Embodiment 2 is the difference in the shape of the blocking portion. In Embodiment 1, the blocking portion is composed of a main body portion, a support portion, a connection portion, and a relaxation portion, but in Embodiment 2, it is composed of a main body portion, a support portion, a connection portion, a relaxation portion, and an opposite portion.

[0067] Further, hereinafter, only the different points from Embodiment 1 will be described, and the description of the same or corresponding parts will be omitted. As for the reference numerals, the same reference numerals will be given to the same or corresponding parts as those of Embodiment 1, and the description will be omitted.

[0068] ​ is an example of a drawing of the blocking portion 11b that the circuit breaker 100b according to the present embodiment has.

[0069] The blocking portion 11b is composed of the main portion 14b, the support portion 13b, the connecting portion 15b, the relief portion 12b, and the opposing portion 16b.

[0070] The opposing portion 16b is continuously provided from the end of the connecting portion 15b on the side of the movable contact 3, and opposes the main portion 14b with the zero-sequence current transformer 9 interposed therebetween. The opposing portion 16b, like the main portion 14b, has a space in the center portion for the conductor 5 to pass through.

[0071] Further, at the end of the opposing portion 16b on the side of the face of the base 1 opposite to the cover 2, a hooking portion 17b is provided that is bent toward the side of the main portion 14b. At this time, the hooking portion 17b is provided so as to have a hooking piece of the zero-sequence current transformer 9 between the face of the base opposite to the cover 2 and the zero-sequence current transformer 9.

[0072] Therefore, in the present embodiment, like Embodiment 1, the blocking portion 11b can fill the space between the cover 2 and the zero-sequence current transformer 9 by eliminating the gap between the cover 2 and the zero-sequence current transformer 9. As a result, there is no need to newly provide a member of the cover, and thus the number of members and the number of work steps are reduced, and the assembly can be improved.

[0073] Further, the blocking portion 11b is integrated without a gap, and thus the arc gas does not enter the gap, and the attachment of the arc gas can be more effectively suppressed.

[0074] Further, the number of members and the number of work steps are reduced, and thus the cost can be reduced.

[0075] In the present embodiment, the cover 2 can fix the zero-sequence current transformer 9 via the relief portion 12b, and thus there is no need to provide an absorber provided on the face of the zero-sequence current transformer 9 on the side of the cover 2 in order to absorb the impact generated by directly pressing the zero-sequence current transformer 9 by the cover 2. Therefore, the reduction of the number of work steps and the number of members can be achieved. Further, there is no gap of the absorber due to the provision of the absorber, and the entry of the conductive flying objects can be suppressed.

[0076] Further, in the manufacturing process of the circuit breaker 100b, since the process of providing the blocking portion 11b between the zero-sequence current transformer 9 and the load-side terminal 6b is performed, the equipment modification cost is small, and this can be achieved.

[0077] In addition, there is no need to install a shielding wall that is separate from the base 1 between phases in order to suppress the deterioration of the insulation between phases; only the blocking part 11a is needed. Therefore, the number of operation steps and parts can be reduced, and the assemblability is improved.

[0078] In addition, the cover 2 fixes the zero-sequence converter 9 by suppressing the damping part 12b of the blocking part 11b, thus also suppressing abnormal noise caused by the vibration of the zero-sequence converter 9.

[0079] In this embodiment, by providing the opposing part 16b, it is possible to further suppress the situation where conductor debris caused by the generated arc gas adheres not only to the load-side terminal 6b but also to the zero-sequence converter 9.

[0080] Furthermore, by configuring the hook portion 17b to have a hook for the zero-sequence converter 9 between the surface of the base 1 opposite to the cover 2 and the zero-sequence converter 9, the warping of the blocking portion 11b caused by the gas pressure generated by the arc gas can be suppressed. In addition, by providing the end of the opposing portion 16b between the zero-sequence converter 9 and the base 1, the assemblability is improved.

[0081] Furthermore, within the scope of its disclosure, the present invention allows for appropriate modifications, omissions, and combinations with other known technologies of the various embodiments.

[0082] Explanation of the label

[0083] 1. Base

[0084] 2 masks

[0085] 3 Opening and closing contacts

[0086] 4. Residual current tripping device

[0087] 5 conductors

[0088] 6a Power supply side terminal

[0089] 6b Load-side terminal

[0090] 7. Joint

[0091] 8. Arc electrode

[0092] 9. Zero-sequence converter

[0093] 10. Control device

[0094] 11a, 11b blocking parts

[0095] 12a, 12b easing sections

[0096] 13a, 13b Support sections

[0097] 14a, 14b Main body

[0098] 15a, 15b connecting portion

[0099] 16b opposite portion

[0100] 17b hooking portion

[0101] 100a, 100b breaker

Claims

1. A circuit breaker, comprising: Opening and closing contacts are separated if an overcurrent flows through them; A conductor that connects the opening / closing contacts to the load-side terminals; A zero-sequence converter is disposed between the switching contacts and the load-side terminals to detect leakage current from the current flowing in the conductor; A blocking section is configured to cover at least a portion of the zero-sequence converter; as well as The frame comprises a base that houses the opening and closing contacts, the conductor, the zero-sequence converter, and the blocking portion, and a cover that covers the base. The blocking portion has: The main body is disposed between the zero-sequence converter and the load-side terminals; A connecting portion that continuously covers at least a portion of the shield-side surface of the zero-sequence converter from one end of the main body; and The buffer section, which is integrally formed with the connecting section, is bent to fill the gap between the cover and the zero-sequence converter.

2. The circuit breaker according to claim 1, wherein, The blocking portion has a support portion that is continuously provided at the end of the main body portion, covering at least a portion of the side surface of the zero-sequence converter opposite to the main body portion.

3. The circuit breaker according to claim 1 or 2, wherein, It also has: If the value of the current detected by the zero-sequence converter is greater than or equal to a predetermined value, the control device outputs a signal to open the switching contact. as well as The leakage current tripping device opens the opening and closing contacts if it receives the signal output by the control device.

4. The circuit breaker according to claim 1 or 2, wherein, The buffer portion is bent in such a way that it becomes a convex portion toward the cover side.

5. The circuit breaker according to claim 1 or 2, wherein, The buffer portion is bent in such a way that it becomes a protrusion facing the surface of the base opposite to the cover.

6. The circuit breaker according to claim 1 or 2, wherein, The buffer portion has multiple stacked portions facing the cover side.

7. The circuit breaker according to claim 1 or 2, wherein, The blocking portion also has a corresponding portion, which is continuously disposed at the end of the connecting portion on the opening / closing contact side and is opposite to the main body portion across the zero-sequence converter. At the end of the opposing portion on the side of the base opposite to the cover, a hook portion is provided that bends toward the main body portion. The hook portion has a hook for the zero-sequence converter between the base surface opposite the cover and the zero-sequence converter.

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