Residual-current circuit breaker

Abstract

The fluxgate magnetic sensor is disposed so as to surround the conductors (505a, 505b), and measures the magnitude of a magnetic field generated by a current flowing through the conductors (505a, 505b). A positioning mechanism (508) determines the position of the conductor (505a, 505b) relative to the fluxgate magnetic sensor. When the measurement value of the fluxgate magnetic sensor is greater than or equal to a threshold value, the drive mechanism drives the opening and closing mechanism to separate the pair of contacts.

Description

[0001] This application is based on Chinese national application No. 201980094768.0 filed on September 27, 2021

[0002] This application is a divisional application of (PCT / JP2019 / 049036) (earth leakage circuit breaker), and its contents are cited below. Technical Field

[0003] The invention relates to a leakage circuit breaker. Background Art

[0004] As a prior art document that discloses the structure of a leakage current detection device for a leakage circuit breaker, there is Japanese Patent Application Laid-Open No. 2015-95323 (Patent Document 1). The leakage current detection device for a leakage circuit breaker described in Patent Document 1 includes a fluxgate DC converter and a signal processing circuit thereof.

[0005] Patent Document 1: Japanese Patent Application Publication No. 2015-95323 Summary of the invention

[0006] When a fluxgate magnetic sensor is used to detect leakage current, the detection accuracy of the fluxgate magnetic sensor varies depending on the positional relationship between the fluxgate magnetic sensor and a conductor through which the current to be measured flows, and thus the reliability of the leakage circuit breaker cannot be stably improved.

[0007] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a leakage circuit breaker capable of stably improving reliability.

[0008] The leakage circuit breaker based on the present invention has an opening and closing mechanism, a driving mechanism, a conductor, a fluxgate magnetic sensor and a positioning mechanism. The opening and closing mechanism has a pair of contacts configured to be able to contact or separate from each other. The driving mechanism drives the opening and closing mechanism. The conductor is electrically connected to each of the pair of contacts. The fluxgate magnetic sensor is configured to surround the conductor and measure the magnitude of the magnetic field generated by the current flowing through the conductor. The positioning mechanism determines the position of the conductor relative to the fluxgate magnetic sensor. When the measurement value of the fluxgate magnetic sensor is greater than or equal to the threshold value, the opening and closing mechanism is driven by the driving mechanism to separate the pair of contacts.

[0009] Effects of the Invention

[0010] According to the present invention, the positional relationship between the fluxgate magnetic sensor and the conductor is determined, thereby stabilizing the detection accuracy of the fluxgate magnetic sensor and stably improving the reliability of the leakage circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a partial cross-sectional view showing the structure of the leakage circuit breaker according to the first embodiment.

[0012] Figure 2 This is a diagram showing a state in which the handle of the leakage circuit breaker according to the first embodiment is in the off-state position and a pair of contacts are separated.

[0013] Figure 3 It is a diagram showing the positional relationship between the fluxgate magnetic sensor unit and the conductor included in the leakage circuit breaker according to the first embodiment.

[0014] Figure 4 It is a diagram showing the positional relationship between the fluxgate magnetic sensor and the conductor included in the leakage circuit breaker according to the first embodiment.

[0015] Figure 5 It is a diagram showing the internal structure of the fluxgate magnetic sensor included in the leakage circuit breaker according to the first embodiment.

[0016] Figure 6 This is a diagram showing a state where the circumferential displacement angle with respect to the reference line of the target line is 0°.

[0017] Figure 7 This is a diagram showing a state where the circumferential displacement angle with respect to the reference line of the target line is 90°.

[0018] Figure 8 This is a diagram showing a state where the circumferential displacement angle with respect to the reference line of the target line is 180°.

[0019] Fig. 9 This is a diagram showing a state where the circumferential displacement angle with respect to the reference line of the target line is 270°.

[0020] Fig.10 This is a graph showing the relationship between the displacement angle and the magnitude of the detection error of the fluxgate magnetic sensor.

[0021] Fig.11 It is a diagram showing the structure of a positioning mechanism included in the leakage circuit breaker according to the first embodiment.

[0022] Fig.12 Yes means Figure 2 A diagram showing a portion of a circuit of a residual current circuit breaker in a state shown.

[0023] Fig.13 This is a diagram showing a state in which the handle of the leakage circuit breaker according to the first embodiment is in the ready state position and a pair of contacts are separated.

[0024] Fig.14 It means in Fig.13 A diagram showing a state in which a pair of contacts are closed when current is supplied from an external power source to the operating coil.

[0025] Fig.15 This is a diagram showing a state in which an overcurrent flows in the leakage circuit breaker according to the first embodiment, the handle is in the trip state position, and a pair of contacts are immediately separated automatically.

[0026] Fig.16 This is a diagram showing a state in which an overcurrent flows in the leakage circuit breaker according to the first embodiment, the handle is in the trip state position, and the automatic separation of a pair of contacts is completed.

[0027] Fig.17 This is a diagram showing a state in which a leakage current flows in the leakage circuit breaker according to the first embodiment, the handle is in the trip state position, and a pair of contacts are immediately separated automatically.

[0028] Fig.18 This is a diagram showing a part of the circuit of the leakage circuit breaker according to the second embodiment.

[0029] Fig.19 This is a diagram showing a state in which a leakage current flows in the leakage circuit breaker according to the third embodiment, the handle is in the trip state position, and a pair of contacts are immediately separated automatically.

[0030] Fig. 20 This is a diagram showing a part of the circuit of the leakage circuit breaker according to the third embodiment.

[0031] Fig.21 It is a perspective view showing the peripheral structure of the fluxgate magnetic sensor unit in the leakage circuit breaker according to the fourth embodiment.

[0032] Fig. 22 It means from Fig.21 The peripheral structure of the fluxgate magnetic sensor unit shown is a perspective view of a state in which the lower case and the like are removed.

[0033] Fig.23 Observed from the direction of arrow XXIII Fig.21 Cross-sectional view of section A.

[0034] Fig.24 This is a diagram showing a part of the circuit of a leakage circuit breaker according to a modification of the fourth embodiment.

[0035] Fig.25 It is a plan view showing the shape of a first conductor position adjustment plate attached to a fluxgate magnetic sensor unit in the leakage circuit breaker according to the fifth embodiment.

[0036] Fig.26 It is a plan view showing the shape of the second conductor position adjustment plate combined with the first conductor position adjustment plate in the residual current circuit breaker according to the fifth embodiment. DETAILED DESCRIPTION

[0037] Hereinafter, a leakage circuit breaker according to each embodiment will be described with reference to the drawings. In the following description of the embodiment, the same reference numerals are given to the same or corresponding parts as those in the drawings, and the description thereof will not be repeated.

[0038] Implementation method 1.

[0039] Figure 1 FIG. 1 is a partial cross-sectional view showing the structure of the leakage circuit breaker according to Embodiment 1. Figure 1 As shown, in the leakage circuit breaker 100 according to the first embodiment, the power supply side terminal 1 is connected to an external wiring (not shown) by a screw 2. The power supply side fixed contact 3 is electrically connected to the power supply side terminal 1.

[0040] The power supply side fixed contact 4 is arranged on the power supply side fixed contact 3. The power supply side movable contact 5 is configured to be opposite to the power supply side fixed contact 4, and contacts the power supply side fixed contact 4 when a pair of contacts are closed. The power supply side movable contact 5 is arranged on the movable contact 6 together with the load side movable contact 7. The movable contact 6 is provided with movable contacts at both ends. Specifically, the power supply side movable contact 5 is provided at one end of the movable contact 6, and the load side movable contact 7 is provided at the other end of the movable contact 6. The movable contact 6 is urged in the direction of contact with the fixed contact by the first elastic body, that is, the pressing spring 56. The pair of contacts consisting of the movable contact and the fixed contact is configured to be able to contact or separate from each other.

[0041] The load-side movable contact 7 is arranged to be opposite to the load-side fixed contact 8, and contacts the load-side fixed contact 8 when the pair of contacts is closed. The load-side fixed contact 8 is provided on the load-side fixed contact 9. As described above, in the pair of fixed contacts consisting of the power-side fixed contact 3 and the load-side fixed contact 9, the fixed contact is provided at a position opposite to the movable contact in a one-to-one correspondence with the movable contact.

[0042] A conductor 505 is connected to the load-side fixed contact 9. The conductor 505 passes through the inside of the fluxgate magnetic sensor unit 500 and is electrically connected to the trip coil 60 which is the second coil.

[0043] The trip coil 60 is connected to the load-side terminal 11. The load-side terminal 11 is made of a magnetic body and forms a magnetic circuit. The load-side terminal 11 is connected to an external wiring (not shown) via a screw 2.

[0044] The fixed iron core 51 formed by stacking silicon steel plates is fixed to the upper housing 18 formed by an insulating material via a fixed iron core pressing member 59. A movable iron core 52 formed by stacking silicon steel plates is arranged opposite to the fixed iron core 51. The movable iron core 52 is configured to be able to contact or separate from the fixed iron core 51. The movable iron core 52 is urged in a direction of separation from the fixed iron core 51 by a second elastic body, that is, a trip spring 55.

[0045] An operating coil 50 which is a first coil is provided around the fixed core 51 . The operating coil 50 is excited by a current supplied from an external power source, and generates an electromagnetic force which attracts the movable core 52 toward the fixed core 51 against the biasing force of the trip spring 55 .

[0046] A crossbar 53 , which is an insulating shaft made of an insulating material, is attached to the movable iron core 52 . The crossbar 53 holds the movable contact 6 , and transmits the reciprocating motion of the movable iron core 52 to the movable contact 6 .

[0047] The crossbar 53 includes a first shaft portion 53a mounted on the movable iron core 52 and a second shaft portion 53b which is arranged to be contactable or detachable with respect to the first shaft portion 53a and mounted on the movable contact member 6. The first shaft portion 53a has a flange portion and an extension portion extending downward from the lower surface of the flange portion. The second shaft portion 53b has a columnar shape. The cross-sectional area of ​​the extension portion of the first shaft portion 53a is smaller than the cross-sectional area of ​​the second shaft portion 53b. Specifically, Figure 1 The width of the extension of the first shaft portion 53a in the depth direction of the paper is narrower than the width of the second shaft portion 53b, so that the cross-sectional area of ​​the extension of the first shaft portion 53a is smaller than the cross-sectional area of ​​the second shaft portion 53b. The second shaft portion 53b is connected to the movable contact 6.

[0048] The first shaft portion 53a is pressed downward by the trip spring 55. The second shaft portion 53b is pressed upward by the pressure spring 56. As a result, the first shaft portion 53a and the second shaft portion 53b are in contact with each other. The preload force of the pressure spring 56 is weaker than the preload force of the trip spring 55, so when the operating coil 50 is demagnetized, the pair of contacts are separated.

[0049] In order to extinguish the arc, a power supply side grid 21 and a load side grid 22 made of magnets are provided. The power supply side grid 21 is fixed to a power supply side grid fixing material 24 made of an insulating material. The load side grid 22 is fixed to a load side grid fixing material 26 made of an insulating material.

[0050] A window 25 for gas escape is provided in the power supply side grid fixing material 24. A window 27 for gas escape is provided in the load side grid fixing material 26. An arc runner 23 made of a conductive material is provided in the lower housing 15 made of insulating resin. The arc runner 23 is preferably made of a magnet. A window 28 and a window 29 for high temperature gas discharge are provided in the lower housing 15. In order to insulate from high temperature gas or arc, a first insulating partition 16 and a second insulating partition 17 are provided. The second insulating partition 17 has a function as a stopper for the downward movement of the first shaft portion 53a.

[0051] The power-side fixed contact 3 and the load-side fixed contact 9 are each formed in a U-shape to promote magnetic drive of the arc. A first insulating partition 16 is arranged inside the U-shape of each of the power-side fixed contact 3 and the load-side fixed contact 9. A second insulating partition 17 is arranged on each of the power-side fixed contact 3 and the load-side fixed contact 9.

[0052] The second insulating partition 17 has an upright portion extending in the up-down direction along the first shaft portion 53a and the second shaft portion 53b. When the operating coil 50 is demagnetized, when the first shaft portion 53a and the movable iron core 52 are moved downward by the preload force of the trip spring 55, the flange portion of the first shaft portion 53a contacts the upright portion of the second insulating partition 17, thereby stopping the first shaft portion 53a and the movable iron core 52.

[0053] An insulating tube 65 is disposed inside the trip coil 60. A plunger 61 is slidably inserted into the insulating tube 65 and inside the inner circumference of the insulating tube 65. The front end of the plunger 61 is a two-pronged structure. A connecting rod 63 is hooked at the front end of the plunger 61. The connecting rod 63 can rotate around the rotating shaft 64 in accordance with the movement of the plunger 61. A plunger spring 62 is installed at the front end of the connecting rod 63, and the connecting rod 63 is urged clockwise.

[0054] When an overcurrent flows and the electromagnetic force generated by the trip coil 60 increases, the plunger 61 is pulled by the load-side terminal 11 against the biasing force of the plunger spring 62 , and the link rod 63 rotates counterclockwise.

[0055] A separation lever 82 is provided to separate the second shaft portion 53b from the first shaft portion 53a. A lever actuating mechanism 80 is configured to actuate the separation lever 82. The lever actuating mechanism 80 includes a handle 81 that manually switches the position between the disconnected state and the ready state.

[0056] The lever operating mechanism 80 is also driven by the overcurrent tripping device including the tripping coil 60. When the overcurrent is automatically disconnected, the handle 81 is switched to the tripping state. When the overcurrent is greater than or equal to the threshold current, the second shaft 53b is pressed by the disconnection lever 82, thereby disconnecting the pair of contacts.

[0057] Figure 2 1 is a diagram showing a state in which the handle of the leakage circuit breaker according to the first embodiment is in the off position and a pair of contacts are separated. Figure 2 , only a part of the structure of the leakage circuit breaker 100 is shown.

[0058] like Figure 1 and Figure 2 As shown, the rear end of the connecting rod 63 is engaged with the front end of the magnetic rod 83 so as to be contactable or separable. The magnetic rod 83 can rotate around the rotation axis 84. When the connecting rod 63 is rotated counterclockwise by the plunger 61, the magnetic rod 83 rotates clockwise around the rotation axis 84.

[0059] The magnetic bar 83 is engaged with the latch 85. The magnetic bar 83 rotates clockwise, thereby rotating the latch 85 counterclockwise. The latch 85 is engaged with the front end of the connecting rod 86 so as to be contactable or separable. The latch 85 is engaged with the front end of the connecting rod 86 when the handle 81 is in any position of the disconnected state and the ready state, and is disengaged from the front end of the connecting rod 86 when the handle 81 is in the position of the tripped state.

[0060] When the handle 81 is in the off state, the pair of contacts are always open. When the handle 81 is in the ready state, the pair of contacts are both open and closed. When the handle 81 is in the trip state, an overcurrent flows, and the pair of contacts are automatically opened.

[0061] The upper part of the upper link 88 is connected to the handle 81 via a rotating shaft. The lower part of the upper link 88 is connected to the upper part of the lower link 89 via a rotating shaft at one end of the U-axis 87. The rotating shaft at the other end of the U-axis 87 is connected to the connecting rod 86. The lower part of the lower link 89 is connected to the arm 90 via a rotating shaft.

[0062] The front end of the arm 90 is connected to the separation rod 82 via the rotation shaft 92. The separation rod 82 is supported so as to be rotatable around the rotation shaft 93. In order to ensure a movable space for the separation rod 82, the cross-sectional area of ​​the extension portion of the first shaft portion 53a is made smaller than the cross-sectional area of ​​the flange portion. The separation rod 82 is configured to clamp the extension portion of the first shaft portion 53a.

[0063] The rear end of the arm 90, i.e., the operating coil switch rod 95, is in a position that can contact or separate from the operating coil switch 94. The operating coil switch 94 controls the supply of current from an external power source to the operating coil 50. The arm 90 is supported so as to be rotatable around the rotating shaft 91. By rotating the arm 90, the operating coil switch rod 95 controls the on / off of the operating coil switch 94.

[0064] The separation lever 82 is connected to the rotation shaft 92 located on the second shaft portion 53b side through the rotation shaft 91 of the arm 90, and the operating coil switch lever 95 is provided on the opposite side of the second shaft portion 53b through the rotation shaft 91, so that the arm 90 rotates around the rotation shaft 91, and the separation lever 82 and the operating coil switch 94 operate in conjunction. By arranging the separation lever 82 on the second shaft portion 53b side, the length of the separation lever 82 can be shortened, and the movable space of the separation lever 82 can be reduced.

[0065] The leakage rod 552 is connected to the magnetic bar 83 via the rotating shaft 554. The plunger 553 of the leakage trip relay 551 is fitted to the front end of the leakage rod 552. The leakage trip relay 551 drives the rod operating mechanism 80 when the measurement value of the fluxgate magnetic sensor is greater than or equal to the threshold value.

[0066] The plunger 553 of the leakage trip relay 551 moves to the right, whereby the leakage rod 552 rotates clockwise around the rotation shaft 555. As a result, the magnetic bar 83 rotates clockwise around the rotation shaft 84.

[0067] As shown above, the leakage circuit breaker 100 has an opening and closing mechanism, a driving mechanism, a conductor 505, and a fluxgate magnetic sensor unit 500. The opening and closing mechanism has a pair of contacts configured to be able to contact or separate from each other. The opening and closing mechanism includes a movable contact 6, a pair of fixed contacts, namely a power supply side fixed contact 3 and a load side fixed contact 9, a first elastic body, namely a pressing spring 56, a fixed iron core 51, a movable iron core 52, a second elastic body, namely a trip spring 55, an insulating shaft, namely a cross bar 53, a separation rod 82, and a rod operating mechanism 80.

[0068] The drive mechanism drives the opening and closing mechanism. The drive mechanism includes the first coil, i.e., the operating coil 50, an overcurrent tripping device, and a leakage tripping relay. The conductor 505 is connected to the load-side fixed contact 9, thereby being electrically connected to a pair of contacts. When the measured value of the fluxgate magnetic sensor is greater than or equal to the threshold value, the drive mechanism drives the opening and closing mechanism to separate the pair of contacts.

[0069] Figure 3 It is a diagram showing the positional relationship between the fluxgate magnetic sensor unit and the conductor included in the leakage circuit breaker according to the first embodiment. Figure 4It is a diagram showing the positional relationship between the fluxgate magnetic sensor and the conductor included in the leakage circuit breaker according to the first embodiment. Figure 5 It is a diagram showing the internal structure of the fluxgate magnetic sensor included in the leakage circuit breaker according to the first embodiment.

[0070] like Figure 3 to Figure 5 As shown, the fluxgate magnetic sensor unit 500 includes a fluxgate magnetic sensor and a positioning mechanism, namely a housing 508. The fluxgate magnetic sensor includes an iron core 501, a primary coil 503, a secondary coil 502, a terminal connection portion 504, an inner shield portion 506 and an outer shield portion 507.

[0071] A high-frequency excitation current flows through the primary coil 503 to excite the iron core 501. The secondary coil 502 is wound around the iron core 501. The terminal connection portion 504 is a terminal portion of each of the primary coil 503 and the secondary coil 502. Each of the primary coil 503 and the secondary coil 502 cannot be wound around the portion of the iron core 501 where the terminal connection portion 504 is located. According to these structures, the fluxgate magnetic sensor has a ring shape extending in the circumferential direction, and has a terminal connection portion 504 in a portion of the circumferential direction. The fluxgate magnetic sensor is configured to surround the conductor 505 and measure the magnitude of the magnetic field generated by the current flowing through the conductor 505.

[0072] In this embodiment, the conductor 505 is composed of two conductors arranged in parallel with each other. Specifically, the conductor 505 is composed of a first conductor 505a and a second conductor 505b. For example, the current flows from the power supply side to the load side in the first conductor 505a, and the current flows from the load side to the power supply side in the second conductor 505b. Alternatively, the current flows from the load side to the power supply side in the first conductor 505a, and the current flows from the power supply side to the load side in the second conductor 505b.

[0073] Here, the transition of the change in the detection accuracy of the fluxgate magnetic sensor based on the positional relationship between the fluxgate magnetic sensor and the conductor 505 will be described.

[0074] Figure 6 This is a diagram showing a state where the circumferential displacement angle with respect to the reference line of the target line is 0°. Figure 7 This is a diagram showing a state where the circumferential displacement angle with respect to the reference line of the target line is 90°. Figure 8 This is a diagram showing a state where the circumferential displacement angle with respect to the reference line of the target line is 180°. Fig. 9 This is a diagram showing a state where the circumferential displacement angle with respect to the reference line of the target line is 270°.

[0075] like Figure 6 to Figure 9As shown, the target line L is a line connecting the center of the terminal connection portion 504 in the circumferential direction and the middle position of the first conductive wire 505a and the second conductive wire 505b. The reference line C is a line perpendicular to a straight line passing through the center of each of the first conductive wire 505a and the second conductive wire 505b.

[0076] like Figure 6 to Figure 9 As shown, the terminal connection portion 504 is displaced counterclockwise, whereby the displacement angle α of the reference line C relative to the target line L increases from 0°.

[0077] Fig.10 This is a graph showing the relationship between the displacement angle and the magnitude of the detection error of the fluxgate magnetic sensor. Fig.10 In FIG. 1 , the magnitude of the detection error of the magnetic sensor is shown on the vertical axis, and the displacement angle (°) is shown on the horizontal axis. The magnitude of the detection error of the fluxgate magnetic sensor is standardized so that the maximum value becomes 1.

[0078] like Fig.10 As shown, the magnitude of the detection error of the fluxgate magnetic sensor increases or decreases with the shift of the displacement angle α of the reference line C relative to the object line L. In the present embodiment, the detection error of the fluxgate magnetic sensor becomes smaller in the range where the displacement angle α is greater than or equal to 100° and less than or equal to 150° and in the range where the displacement angle α is greater than or equal to 280° and less than or equal to 330°.

[0079] Therefore, the fluxgate magnetic sensor unit 500 included in the residual current circuit breaker 100 according to the present embodiment includes a housing 508 which is a positioning mechanism for determining the position of the conductor 505 relative to the fluxgate magnetic sensor.

[0080] Fig.11 FIG. 1 is a diagram showing the structure of a positioning mechanism included in the leakage circuit breaker according to the first embodiment. Fig.11 In FIG. 5 , the terminal connection portion 504 not included in the housing 508 is indicated by a dotted line. The housing 508 is fixed to the fluxgate magnetic sensor in such a manner that the terminal connection portion 504 is located at a position indicated by a dotted line.

[0081] like Fig.11 As shown, the housing 508 has at least one positioning through hole for inserting and passing the conductor 505. In this embodiment, the housing 508 has a first positioning through hole 509a and a second positioning through hole 509b for inserting and passing the first conductive wire 505a and the second conductive wire 505b in a one-to-one manner as at least one positioning through hole.

[0082] like Figure 3As shown, in this embodiment, the first conductive wire 505a is inserted through the first positioning through hole 509a, and the second conductive wire 505b is inserted through the second positioning through hole 509b. In addition, the second conductive wire 505b is inserted through the first positioning through hole 509a, and the first conductive wire 505a is inserted through the second positioning through hole 509b.

[0083] The center of the first positioning through hole 509a corresponds to the center of the first conductive wire 505a, and the center of the second positioning through hole 509b corresponds to the center of the second conductive wire 505b. Fig.11 As shown, the object line L is a line connecting the central part of the terminal connection portion 504 in the circumferential direction and the middle position of the first positioning through hole 509a and the second positioning through hole 509b. The reference line C is a line orthogonal to the straight line passing through the center of each of the first positioning through hole 509a and the second positioning through hole 509b.

[0084] like Figure 3 As shown, the first conductive wire 505a is inserted through the first positioning through hole 509a, and the second conductive wire 505b is inserted through the second positioning through hole 509b, whereby the displacement angle α of the reference line C relative to the object line L can determine the positions of the first conductive wire 505a and the second conductive wire 505b relative to the fluxgate magnetic sensor, so that they are within the range where the detection error of the above-mentioned fluxgate magnetic sensor is reduced.

[0085] In addition, Figure 3 In the figure, for ease of understanding, the diameters of the first positioning through hole 509a and the second positioning through hole 509b are recorded as being relatively larger than the diameters of the first conductive wire 505a and the second conductive wire 505b. However, in order to improve the positioning accuracy of the conductor 505, the diameters of the first positioning through hole 509a and the second positioning through hole 509b are preferably slightly larger than the diameters of the first conductive wire 505a and the second conductive wire 505b.

[0086] In this embodiment, the first conductor 505a is inserted through the first positioning through hole 509a, and the second conductor 505b is inserted through the second positioning through hole 509b, thereby positioning the first conductor 505a and the second conductor 505b relative to the fluxgate magnetic sensor. However, the conductor 505 can also be positioned relative to the fluxgate magnetic sensor by other structures.

[0087] like Figure 1As shown, in this embodiment, the winding direction of the operating coil 50 and the tripping coil 60 intersects with the penetration direction of the first positioning through hole 509a and the second positioning through hole 509b. Specifically, the winding direction of the operating coil 50 and the tripping coil 60 is orthogonal to the penetration direction of the first positioning through hole 509a and the second positioning through hole 509b.

[0088] Next, the normal opening and closing operation of the leakage circuit breaker 100 having the above-mentioned structure will be described.

[0089] exist Figure 2 In the state shown, the separation lever 82 presses the second shaft portion 53b against the preload force of the pressing spring 56, thereby the power side movable contact 5 and the power side fixed contact 4 are in a separation state, and the load side movable contact 7 and the load side fixed contact 8 are in a separation state. In this state, the arm 90 rotates clockwise around the rotating shaft 91, the operating coil switch lever 95 is separated from the operating coil switch 94, and the operating coil switch 94 is in an off state.

[0090] Fig.12 Yes means Figure 2 The diagram shows a portion of the circuit of a residual current circuit breaker in the state shown. Fig.12 As shown, an external power source (not shown) is connected to the first operating coil terminal 57 and the second operating coil terminal 58. The operating coil switch 94 is in the off state, so the operating coil 50 is not excited. The operating coil 50 does not generate electromagnetic force, so the movable iron core 52 is pulled away from the fixed iron core 51 by the preload force of the trip spring 55 and moves downward, and stops when it contacts the second insulating partition 17. The second shaft portion 53b is pressed downward by the separation rod 82.

[0091] In this embodiment, the fluxgate magnetic sensor is connected to a power source common to the operating coil 50. The fluxgate magnetic sensor and the operating coil 50 are connected to or disconnected from the external power source by a common switch, that is, the operating coil switch 94.

[0092] Fig.13 1 is a diagram showing a state in which the handle of the leakage circuit breaker according to the first embodiment is in the ready state and a pair of contacts are separated. Fig.13 , only a part of the structure of the leakage circuit breaker 100 is shown.

[0093] like Fig.13 As shown in FIG. 1 , the handle 81 is rotated counterclockwise, whereby the upper link 88 rotates clockwise and moves downward, and the lower link 89 also moves downward. Therefore, the arm 90 rotates counterclockwise around the rotation axis 91. As a result, the rotation axis 92 rotates counterclockwise, and the separation lever 82 rotates clockwise around the rotation axis 93 and separates from the second shaft portion 53b.

[0094] The second shaft portion 53b and the movable contact 6 are moved upward by the preload force of the pressing spring 56, and the second shaft portion 53b and the first shaft portion 53a are in contact with each other. The preload force of the pressing spring 56 is weaker than the preload force of the trip spring 55, so the first shaft portion 53a is maintained in contact with the second insulating partition 17. The arm 90 rotates counterclockwise, whereby the operating coil switch rod 95 sets the operating coil switch 94 to the on state. In this state, if current is supplied to the operating coil 50 from an external power supply via the first operating coil terminal 57 and the second operating coil terminal 58, a pair of contacts becomes closed.

[0095] Fig.14 It means in Fig.13 In the state where the external power supply supplies current to the operating coil and a pair of contacts are closed. Fig.14 As shown, if the operating coil switch 94 supplies current from an external power supply to the operating coil 50 when it is in the on state, the movable iron core 52 and the first shaft portion 53a connected to the movable iron core 52 move upward against the preload of the trip spring 55, and the movable iron core 52 contacts the fixed iron core 51 and stops.

[0096] The preload force of the trip spring 55 and the electromagnetic force of the operating coil 50 cancel each other out, so the preload force of the pressing spring 56 causes the second shaft 53b and the movable contact 6 to move upward, the fixed contact 4 on the power supply side and the movable contact 5 on the power supply side come into contact, and the fixed contact 8 on the load side and the movable contact 7 on the load side come into contact, thereby closing a pair of contacts.

[0097] As a result, the current flowing in from the external wiring flows in sequence through the power side terminal 1, the power side fixed contact 3, the power side fixed contact 4, the power side movable contact 5, the movable contact 6, the load side movable contact 7, the load side fixed contact 8, the load side fixed contact 9, the conductor 505, the trip coil 60 and the load side terminal 11 and flows out to the external wiring.

[0098] If no current is supplied from the external power supply to the operating coil 50, the movable iron core 52 separates from the fixed iron core 51, and the first shaft portion 53a moves until it contacts the second insulating partition portion 17 due to the preload force of the trip spring 55. The second shaft portion 53b is pressed down by the first shaft portion 53a, thereby separating the pair of contacts.

[0099] When the handle 81 is manually opened when one pair of contacts is closed, Figure 2 That is, the opening rod 82 presses the second shaft portion 53b, and the pair of contacts is opened. In addition, the operating coil switch 94 is turned off, so that the first shaft portion 53a moves downward until it contacts the second insulating partition portion 17.

[0100] Next, the switching operation when an overcurrent flows through the leakage circuit breaker 100 and a pair of contacts automatically opens will be described.

[0101] Fig.15 1 is a diagram showing a state in which an overcurrent flows, the handle is in a tripped state, and a pair of contacts are automatically separated in the leakage circuit breaker according to Embodiment 1. The current flows through the trip coil 60. Due to the current flowing in normal times, the electromagnetic force generated by the trip coil 60 acts on the plunger 61, but the preload force of the plunger spring 62 is stronger than the electromagnetic force, so the plunger 61 does not move.

[0102] However, if the value of the current is greater than or equal to the threshold value, the plunger 61 slides upward in the insulating tube 65 against the preload force of the plunger spring 62 by the magnetic field generated by the trip coil 60 and the magnetic circuit formed by the load-side terminal 11 and the plunger 61 itself formed by the magnet. The threshold value is, for example, 10 to 20 times the current in normal conditions, and is appropriately set according to the purpose of the leakage circuit breaker 100.

[0103] The plunger 61 moves upward, whereby the connecting rod 63 rotates counterclockwise around the rotation axis 64, whereby the magnetic rod 83 rotates clockwise around the rotation axis 84. As a result, the latch 85 rotates counterclockwise, and the front end of the connecting rod 86 is separated from the latch 85. The handle 81 rotates clockwise, whereby the connecting rod 86 rotates counterclockwise. At this time, the handle 81 is in the trip state.

[0104] The upper link 88 connected to the U-axis 87 and the handle 81 moves upward as a whole by moving the upper part to the upper left and the lower part to the upper right. The lower link 89 connected to the upper link 88 also moves upward, causing the arm 90 to rotate clockwise around the rotation axis 91. The separation lever 82 connected to the rotation axis 92 rotates counterclockwise around the rotation axis 93, pressing the second shaft portion 53b, and separating the power supply side movable contact 5 and the load side movable contact 7.

[0105] The normal separation distance is determined by the first shaft portion 53a moving downward and coming into contact with the second insulating partition portion 17 and stopping. However, the separation distance during overcurrent can be adjusted according to the amount of pressure applied to the second shaft portion 53b by the separation rod 82, and can be greater than the normal separation distance, so that the overcurrent can be easily disconnected.

[0106] In addition, the opening rod 82 is light, and only the second shaft portion 53b, the movable contact 6, the power supply side movable contact 5, and the load side movable contact 7 are moved, so the opening speed can be increased. Thus, the overcurrent can be easily disconnected.

[0107] Fig.161 is a diagram showing a state in which an overcurrent flows through the leakage circuit breaker according to the first embodiment, the handle is in the tripping state, and the automatic separation of a pair of contacts is completed. Fig.16 As shown, when the arm 90 rotates clockwise, the operating coil switch lever 95 also rotates clockwise, and the operating coil switch 94 becomes off. As a result, the current supply to the operating coil 50 stops, and the movable iron core 52 moves downward and stops in contact with the second insulating partition 17.

[0108] The separation rod 82 and the operating coil switch rod 95 are linked and move approximately at the same time, but the movable iron core 52 is heavy and has a large inertia force, so the movement is slow. Fig.16 The movable core 52 shown in the figure is actuated after a pair of contacts are separated by the separation rod 82.

[0109] The power side movable contact 5 and the power side fixed contact 4 and the load side movable contact 7 and the load side fixed contact 8 are separated, thereby generating an arc between these contacts. The power side fixed contact 3 and the load side fixed contact 9 are each formed in a U-shape, so the Lorentz force acts on the arc on the side opposite to the second shaft portion 53b.

[0110] Therefore, the arc on the power side flows between the power side fixed contact 3 and the arc runner 23, and enters the power side grid 21 fixed by the power side grid fixing material 24. Similarly, the arc on the load side flows between the load side fixed contact 9 and the arc runner 23, and enters the load side grid 22 fixed by the load side grid fixing material 26.

[0111] The arc entering each power side grid 21 and load side grid 22 has voltage due to the cathode drop voltage and cooling, and the current is limited and the circuit is cut off. The high temperature gas on the power side heated by the arc passes through the window 25 and is discharged from the window 28. Similarly, the high temperature gas on the load side passes through the window 27 and is discharged from the window 29.

[0112] In order to close the contact pair again, turn the handle 81 as Figure 2 After temporarily setting it to disconnected state, Fig.13 If the handle 81 is not manually set to the ready state, the operating coil switch 94 is not turned on, so that the pair of contacts are not automatically closed.

[0113] Next, the switching operation when a pair of contacts are automatically opened when a leakage current flows through the leakage circuit breaker 100 will be described.

[0114] Fig.17 This is a diagram showing a state in which a leakage current flows in the leakage circuit breaker according to the first embodiment, the handle is in the trip state position, and a pair of contacts are immediately separated automatically.

[0115] like Fig.12 As shown, in the leakage circuit breaker 100 involved in the present embodiment, the fluxgate magnetic sensor included in the fluxgate magnetic sensor unit 500 is connected to a power supply of the same system as the operating coil 50. The excitation current that is high-frequency passes through the internal circuit of the fluxgate magnetic sensor and flows through the primary coil 503. A power supply is connected to a circuit different from the circuit in which the main current flows from the external wiring, so that it is not easily affected by noise when the circuit in which the main current flows is grounded. In addition, if the operating coil switch 94 is turned off, the current supply to the fluxgate magnetic sensor stops, so that no unnecessary power consumption occurs. The iron core 501 is periodically saturated by the excitation current of the primary coil 503.

[0116] When leakage occurs and the current values ​​flowing through the first conductive wire 505a and the second conductive wire 505b differ, a deviation occurs in the time when the core 501 is saturated. As a result, current flows through the secondary coil 502. The output obtained by amplifying the signal of the current is transmitted to the substrate of the leakage trip relay 551. In addition, the signal transmitted to the substrate of the leakage trip relay 551 can be converted into a voltage when the current of the secondary coil 502 passes through the resistor.

[0117] If the output value of the fluxgate magnetic sensor is greater than or equal to the threshold value, the plunger 553 of the leakage trip relay 551 moves to the right. As a result, the leakage rod 552 rotates clockwise around the rotating shaft 555. The magnetic bar 83 rotates clockwise via the rotating shaft 554, the spring key 85 rotates counterclockwise, and the front end of the connecting rod 86 is separated from the spring key 85. The handle 81 rotates clockwise, and the connecting rod 86 rotates counterclockwise. At this time, the handle 81 is in the trip state.

[0118] The upper link 88 connected to the U-axis 87 and the handle 81 moves upward as a whole by moving the upper part to the upper left and the lower part to the upper right. The lower link 89 connected to the upper link 88 also moves upward, causing the arm 90 to rotate clockwise around the rotation axis 91. The separation lever 82 connected to the rotation axis 92 rotates counterclockwise around the rotation axis 93, pressing the second shaft portion 53b, and separating the power supply side movable contact 5 and the load side movable contact 7.

[0119] like Fig.17 As shown, when the arm 90 rotates clockwise, the operating coil switch lever 95 also rotates clockwise, and the operating coil switch 94 is turned off. The current supply to the operating coil 50 stops, and the movable iron core 52 moves downward and stops in contact with the second insulating partition 17.

[0120] In the leakage circuit breaker 100 involved in this embodiment, the positioning mechanism determines the position of the conductor 505 relative to the fluxgate magnetic sensor. When the measured value of the fluxgate magnetic sensor is greater than or equal to the threshold value, the opening and closing mechanism is driven by the driving mechanism to separate the pair of contacts. Thus, the positional relationship between the fluxgate magnetic sensor and the conductor 505 is determined, thereby stabilizing the detection accuracy of the fluxgate magnetic sensor and stably improving the reliability of the leakage circuit breaker 100.

[0121] In the leakage circuit breaker 100 according to the present embodiment, the positioning mechanism has at least one positioning through hole through which the conductor 505 is inserted. Thus, the positional relationship between the fluxgate magnetic sensor and the conductor 505 can be determined with a simple structure.

[0122] In the leakage circuit breaker 100 according to the present embodiment, the displacement angle α of the object line L connecting the central portion of the terminal connection portion 504 in the circumferential direction and the intermediate position of the two positioning through holes relative to the reference line C orthogonal to the straight line passing through the centers of the two positioning through holes is greater than or equal to 100° and less than or equal to 150° or greater than or equal to 280° and less than or equal to 330°. Thus, the detection error of the fluxgate magnetic sensor can be reduced and the reliability of the leakage circuit breaker 100 can be improved.

[0123] The leakage circuit breaker 100 according to the present embodiment includes the leakage trip relay 551 that drives the lever operating mechanism 80 when the measurement value of the fluxgate magnetic sensor is equal to or greater than the threshold value. This can stably improve the reliability of the leakage circuit breaker 100.

[0124] In the leakage circuit breaker 100 according to the present embodiment, the winding directions of the operating coil 50 and the trip coil 60 intersect with the through direction of at least one positioning through hole. This can prevent the detection accuracy of the fluxgate magnetic sensor from being reduced due to the magnetic fields generated by the operating coil 50 and the trip coil 60.

[0125] In the leakage circuit breaker 100 according to the present embodiment, the winding directions of the operating coil 50 and the trip coil 60 are orthogonal to the through direction of at least one positioning through hole. This can prevent the detection accuracy of the fluxgate magnetic sensor from being reduced due to the magnetic fields generated by the operating coil 50 and the trip coil 60.

[0126] In the leakage circuit breaker 100 of this embodiment, the fluxgate magnetic sensor is connected to a power source common to the operating coil 50, and the fluxgate magnetic sensor and the operating coil 50 are connected to or disconnected from the power source through the common operating coil switch 94. Thus, the power consumption of the leakage circuit breaker 100 can be reduced.

[0127] Implementation method 2.

[0128] Next, the leakage circuit breaker according to Embodiment 2 will be described with reference to the drawings. The leakage circuit breaker according to Embodiment 2 differs from the leakage circuit breaker 100 according to Embodiment 1 only in the connection path with the power supply of the fluxgate magnetic sensor, and therefore the same structure as that of the leakage circuit breaker 100 according to Embodiment 1 will not be described repeatedly.

[0129] Fig.18 FIG. 2 is a diagram showing a part of the circuit of the leakage circuit breaker according to Embodiment 2. Fig.18 As shown, in the leakage circuit breaker 200 according to the second embodiment, the fluxgate magnetic sensor is connected to a power source common to the current flowing through the conductor 505. The fluxgate magnetic sensor is connected to a portion of the conductor 505 that is downstream of the current flow compared to the portion through which the fluxgate magnetic sensor is inserted. That is, the power source of the fluxgate magnetic sensor is obtained from the load side compared to the load side movable contact 7 and the load side fixed contact 8. As a result, when a pair of contacts are separated, no current is supplied to the fluxgate magnetic sensor, so that no unnecessary power consumption occurs.

[0130] Implementation method 3.

[0131] Next, a leakage circuit breaker according to Embodiment 3 will be described with reference to the drawings. The leakage circuit breaker according to Embodiment 3 differs from the leakage circuit breaker 100 according to Embodiment 1 mainly in that it does not have an operating coil, and therefore the same configuration as that of the leakage circuit breaker 100 according to Embodiment 1 will not be described repeatedly.

[0132] Fig.19 This is a diagram showing a state in which a leakage current flows in the leakage circuit breaker according to the third embodiment, the handle is in the trip state position, and a pair of contacts are immediately separated automatically. Fig. 20 This is a diagram showing a part of the circuit of the leakage circuit breaker according to the third embodiment.

[0133] The switching operation when a pair of contacts are automatically separated when a leakage current flows through the leakage circuit breaker 300 according to the third embodiment will be described.

[0134] like Fig.19 and Fig. 20 As shown, the fluxgate magnetic sensor obtains power from the load-side fixed contact 9, and the high-frequency excitation current flows through the primary coil 503 through the internal circuit of the fluxgate magnetic sensor. The power supply of the fluxgate magnetic sensor is obtained from the load side compared with the load-side movable contact 7 and the load-side fixed contact 8. Therefore, when a pair of contacts are separated, no current is supplied to the fluxgate magnetic sensor, so no unnecessary power consumption occurs. The iron core 501 is periodically saturated by the excitation current of the primary coil 503.

[0135] When leakage occurs and the current values ​​flowing through the first conductive wire 505a and the second conductive wire 505b differ, a deviation occurs in the time when the core 501 is saturated. As a result, current flows through the secondary coil 502. The output obtained by amplifying the signal of the current is transmitted to the substrate of the leakage trip relay 551. In addition, the signal transmitted to the substrate of the leakage trip relay 551 can be converted into a voltage when the current of the secondary coil 502 passes through the resistor.

[0136] If the output value of the fluxgate magnetic sensor is greater than or equal to the threshold value, the plunger 553 of the leakage trip relay 551 moves to the right. As a result, the leakage rod 552 rotates clockwise around the rotating shaft 555. The magnetic bar 83 rotates clockwise via the rotating shaft 554, the latch 85 rotates counterclockwise, and the front end of the connecting rod 86 is separated from the latch 85. The handle 81 rotates clockwise, and the connecting rod 86 rotates counterclockwise. At this time, the handle 81 is located in the trip state.

[0137] The upper link 88 connected to the U-axis 87 and the handle 81 moves upward as a whole by moving the upper part to the upper left and the lower part to the upper right. The lower link 89 connected to the upper link 88 also moves upward, causing the arm 90 to rotate clockwise around the rotation axis 91. As a result, the insulating shaft 353 is pressed down, and the power supply side movable contact 5 and the load side movable contact 7 are separated.

[0138] In the leakage circuit breaker 300 involved in this embodiment, the positioning mechanism also determines the position of the conductor 505 relative to the fluxgate magnetic sensor. When the measured value of the fluxgate magnetic sensor is greater than or equal to the threshold value, the driving mechanism drives the opening and closing mechanism to separate the pair of contacts. Thus, the positional relationship between the fluxgate magnetic sensor and the conductor 505 is determined, thereby stabilizing the detection accuracy of the fluxgate magnetic sensor and stably improving the reliability of the leakage circuit breaker 300.

[0139] Implementation method 4.

[0140] Next, a leakage circuit breaker according to Embodiment 4 will be described with reference to the drawings. The leakage circuit breaker according to Embodiment 4 is mainly different from the leakage circuit breaker 100 according to Embodiment 1 in the structure of the positioning mechanism, and therefore the same structure as that of the leakage circuit breaker 100 according to Embodiment 1 will not be described repeatedly.

[0141] Fig.21 It is a perspective view showing the peripheral structure of the fluxgate magnetic sensor unit in the leakage circuit breaker according to the fourth embodiment. Fig. 22 It means from Fig.21 The peripheral structure of the fluxgate magnetic sensor unit shown is a perspective view of a state in which the lower case and the like are removed. Fig.23 It means observing from the direction of arrow XXIII Fig.21 A cross-sectional view of section A. Fig.21 , the cross-sectional shape of a portion of the structure in cross section A is shown.

[0142] like Figures 21 to 23 As shown, in the present embodiment, the conductor 505 is composed of two busbars arranged at intervals from each other. Specifically, it is composed of a first busbar 605a and a second busbar 605b. The first busbar 605a and the second busbar 605b each have a bent rod-like shape. In addition, the conductor 505 is not limited to the case where it is composed of busbars, and can also be composed of conductive wires. The leakage circuit breaker involved in the present embodiment has a potential that is out of phase with the first busbar 605a and the second busbar 605b, and also has a third busbar 605c that does not pass through the fluxgate magnetic sensor unit 500. The first busbar 605a is connected to the first load-side fixed contact 9a. The second busbar 605b is connected to the second load-side fixed contact 9b. The third busbar 605c is connected to the third load-side fixed contact 9c.

[0143] The positioning mechanism includes an insulating resin component 600a, which surrounds two receiving portions located between the first busbar 605a and the second busbar 605b and receives one of each of the first busbar 605a and the second busbar 605b. Specifically, the insulating resin component 600a is inserted into a through hole 609 that passes through the housing 608. The insulating resin component 600a includes a flat plate portion 601a, a first receiving portion 602a, and a second receiving portion 603a. The flat plate portion 601a extends in the radial direction of the through hole 609. Both ends of the flat plate portion 601a are fixed to the inner surface of the through hole 609 of the housing 608.

[0144] The first receiving portion 602a includes a pair of wall portions that are spaced apart from each other and are vertically arranged in a direction perpendicular to the above-mentioned radial direction from one surface of the flat plate portion 601a, and receive the first busbar 605a. The second receiving portion 603a includes another pair of wall portions that are spaced apart from each other and are vertically arranged in a direction perpendicular to the above-mentioned radial direction from the other surface of the flat plate portion 601a, and receive the second busbar 605b. The first busbar 605a and the second busbar 605b are electrically insulated from each other by the insulating resin component 600a. The insulating resin component 600a also has a third receiving portion on the outside of the housing 608 for receiving the third busbar 605c.

[0145] The fluxgate magnetic sensor unit 500 is mounted on a mounting table 600b made of insulating resin. The first bus bar 605a, the second bus bar 605b, and the third bus bar 605c are electrically insulated from each other by the mounting table 600b.

[0146] like Fig.23As shown, the object line L is a line connecting the central part of the terminal connection part 504 and the middle position between the center of each cross section of the first busbar 605a and the second busbar 605b. The object line L extends along the above-mentioned radial direction of the flat plate part 601a. ​​The reference line C is a line orthogonal to the straight line passing through the center of each cross section of the first busbar 605a and the second busbar 605b. In addition, the center of each cross section mentioned above can also be the centroid. In this embodiment, the circumferential displacement angle of the reference line C relative to the object line L is greater than or equal to 100° and less than or equal to 150° or greater than or equal to 280° and less than or equal to 330°.

[0147] The leakage circuit breaker according to the fourth embodiment further includes a bimetal 601 and a heater 602 which serve as a thermal relay. Current flows from the conductor 505 through the heater 602 and from the trip coil 60 to the load-side terminal 11. When an overcurrent flows, the bimetal 601 bends due to the heat of the heater 602, thereby rotating the link rod 63, and tripping can be performed by the mechanism described in the first embodiment.

[0148] In the leakage circuit breaker according to Embodiment 4, the positioning mechanism includes an insulating resin member 600a having a first receiving portion 602a and a second receiving portion 603a located between the first bus bar 605a and the second bus bar 605b and receiving one of each of the first bus bar 605a and the second bus bar 605b. Thus, the positional relationship between the fluxgate magnetic sensor unit 500 and the conductor 505 can be determined with a simple structure.

[0149] In the leakage circuit breaker according to the fourth embodiment, the circumferential displacement angle of the reference line C relative to the object line L is greater than or equal to 100° and less than or equal to 150° or greater than or equal to 280° and less than or equal to 330°. Thus, the detection error of the fluxgate magnetic sensor unit 500 can be reduced.

[0150] Here, a leakage circuit breaker according to a modification of the fourth embodiment in which the third bus bar 605c is not provided will be described. Fig.24 This is a diagram showing a part of the circuit of a leakage circuit breaker according to a modification of the fourth embodiment.

[0151] like Fig.24 As shown, in the residual current circuit breaker involved in the modified example of the fourth embodiment, the third busbar 605c is not provided. Fig.12 Compared with the circuit structure shown in FIG. 1 , the structure of the leakage circuit breaker becomes simpler.

[0152] Implementation method 5.

[0153] Next, a leakage circuit breaker according to Embodiment 5 will be described with reference to the drawings. The leakage circuit breaker according to Embodiment 5 mainly differs from the leakage circuit breaker 100 according to Embodiment 1 in the structure of the positioning mechanism, and therefore the same structure as that of the leakage circuit breaker 100 according to Embodiment 1 will not be described repeatedly.

[0154] Fig.25 It is a plan view showing the shape of a first conductor position adjustment plate attached to a fluxgate magnetic sensor unit in the leakage circuit breaker according to the fifth embodiment. Fig.26 It is a plan view showing the shape of the second conductor position adjustment plate combined with the first conductor position adjustment plate in the residual current circuit breaker according to the fifth embodiment.

[0155] In the leakage circuit breaker according to the fifth embodiment, the positioning mechanism includes a housing 508, a first conductor position adjustment plate 650, and a second conductor position adjustment plate 652. The fluxgate magnetic sensor unit 500 is provided with Fig.25 The first conductor position adjustment plate 650 is shown. A hole portion 650h through which the first conductive wire 505a and the second conductive wire 505b pass is provided at the center of the first conductor position adjustment plate 650, and four holes 651 are provided at the four corners of the first conductor position adjustment plate 650. The hole portion 650h of the first conductor position adjustment plate 650 is arranged to be located at the center of the housing 508 and to overlap with the hole portion 508h through which the first conductive wire 505a and the second conductive wire 505b pass.

[0156] like Fig.26 As shown, the second conductor position adjustment plate 652 has at least one positioning through hole, which includes a first positioning through hole 654a and a second positioning through hole 654b through which the first conductor 505a and the second conductor 505b are inserted in a one-to-one manner. The second conductor position adjustment plate 652 is further provided with four hole portions 653 at positions corresponding to the four hole portions 651.

[0157] The first conductor position adjustment plate 650 and the second conductor position adjustment plate 652 sandwich the housing 508 between each other and are fastened by inserting bolts and nuts that penetrate the hole 651 and the hole 653. In this state, the first conductor 505a is inserted through the first positioning through hole 654a, and the second conductor 505b is inserted through the second positioning through hole 654b, thereby determining the positions of the first conductor 505a and the second conductor 505b relative to the fluxgate magnetic sensor, so that the detection error of the fluxgate magnetic sensor is reduced. Therefore, in the leakage circuit breaker involved in the fifth embodiment, the same effect as the leakage circuit breaker involved in the first embodiment is obtained.

[0158] In the description of the above embodiments, structures that can be combined can be combined with each other.

[0159] In addition, the above-mentioned embodiments disclosed this time are illustrative in all aspects and are not the basis for limiting interpretation. Therefore, the technical scope of the present invention is not only interpreted by the above-mentioned embodiments. In addition, all changes within the scope and scope equivalent to the claims are included.

[0160] Description of the label

[0161] 1 Power supply side terminal, 2 screw, 3 power supply side fixed contact, 4 power supply side fixed contact, 5 power supply side movable contact, 6 movable contact, 7 load side movable contact, 8 load side fixed contact, 9 load side fixed contact, 9a 1st load side fixed contact, 9b 2nd load side fixed contact, 9c 3rd load side fixed contact, 11 load side terminal, 15 lower shell, 18 upper shell, 508, 608 shell, 16 1st insulating partition, 17 2nd insulating partition, 21 power supply side grid, 22 load side grid, 23 arc roller ring, 24 electric Source side grid fixing material, 25, 27, 28, 29 window, 26 load side grid fixing material, 50 operating coil, 51 fixed iron core, 52 movable iron core, 53 cross bar, 53a first shaft, 53b second shaft, 55 trip spring, 56 pressing spring, 57 first operating coil terminal, 58 second operating coil terminal, 59 fixed iron core pressing component, 60 trip coil, 61, 553 plunger, 62 plunger spring, 63 connecting rod, 64, 84, 91, 92, 93, 554, 555 rotating shaft, 65 insulating tube, 80 rod working machine structure, 81 handle, 82 rod, 83 magnetic rod, 85 spring key, 86 connecting rod, 87 U shaft, 88 upper connecting rod, 89 lower connecting rod, 90 arm, 94 operating coil switch, 95 operating coil switch rod, 100, 200, 300 residual current circuit breaker, 353 insulating shaft, 500 fluxgate magnetic sensor unit, 501 iron core, 502 secondary coil, 503 primary coil, 504 terminal connection part, 505 conductor, 505a first conductor, 505b second conductor, 506 inner shield, 507 outer shield, 508h, 650h, 651 , 653 hole portion, 509a, 654a first positioning through holes, 509b, 654b second positioning through holes, 551 relay, 552 leakage rod, 600a insulating resin component, 600b mounting table, 601 bimetallic piece, 601a flat plate portion, 602 heater, 602a first receiving portion, 603a second receiving portion, 605a first bus bar, 605b second bus bar, 605c third bus bar, 609 through hole, 650 first conductor position adjustment plate, 652 second conductor position adjustment plate, C reference line, L object line.

Claims

1. A leakage circuit breaker, comprising: an opening and closing mechanism having a pair of contacts configured to be able to contact or separate from each other; A driving mechanism, which drives the opening and closing mechanism; a conductor electrically connected to each of the pair of contacts; a fluxgate magnetic sensor configured to surround the conductor and measure the magnitude of a magnetic field generated by a current flowing through the conductor; as well as a positioning mechanism that determines the position of the conductor relative to the fluxgate magnetic sensor, When the measured value of the fluxgate magnetic sensor is greater than or equal to the threshold value, the driving mechanism drives the opening and closing mechanism so that the pair of contacts are separated. The positioning mechanism has at least one positioning through hole through which the conductor is inserted. The fluxgate magnetic sensor has a ring shape extending in the circumferential direction and has a terminal connection portion in a portion of the circumferential direction. The conductor is composed of two wires arranged in parallel with each other. The positioning mechanism has two positioning through holes as the at least one positioning through hole, through which the two conductive wires are inserted in a one-to-one relationship. The displacement angle of the object line connecting the central part of the terminal connection portion and the middle position of the two positioning through holes in the circumferential direction relative to the reference line orthogonal to the straight line passing through the centers of the two positioning through holes in the circumferential direction is fixed. When the measurement value of the fluxgate magnetic sensor is greater than or equal to a threshold value, the opening and closing mechanism is driven by the driving mechanism so that the pair of contacts are separated.

2. The residual current circuit breaker according to claim 1, wherein: The displacement angle is greater than or equal to 100° and less than or equal to 150° or greater than or equal to 280° and less than or equal to 330°.

3. The residual current circuit breaker according to claim 1 or 2, wherein: The opening and closing mechanism comprises: A movable contact piece having movable contact points at both ends; a pair of fixed contacts, which are provided with fixed contacts at positions opposite to the movable contacts in a one-to-one correspondence with the movable contacts; a first elastic body which applies force to the movable contact in a direction in which the movable contact contacts the fixed contact; Fixed core; a movable iron core arranged to face the fixed iron core and configured to be contactable with or separable from the fixed iron core; a second elastic body for applying force to the movable iron core in a direction of separation from the fixed iron core; an insulating shaft, which is made of an insulating material and includes a first shaft portion mounted on the movable iron core and a second shaft portion which is provided to be contactable or separable with respect to the first shaft portion and mounted on the movable contact; a separation rod for separating the second shaft portion from the first shaft portion; and a rod operating mechanism that operates the separation rod, The driving mechanism comprises: a first coil disposed around the fixed core and generating an electromagnetic force to counteract the preload force of the second elastic body and attract the movable core toward the fixed core; an overcurrent tripping device, which drives the rod working mechanism; and A leakage trip relay drives the rod working mechanism when the measurement value of the fluxgate magnetic sensor is greater than or equal to a threshold value.

4. The residual current circuit breaker according to claim 3, wherein: The overcurrent tripping device comprises a second coil, The winding axis directions of the first coil and the second coil intersect with the penetration direction of the at least one positioning through-hole.

5. The residual current circuit breaker according to claim 4, wherein: The winding axis direction of each of the first coil and the second coil is orthogonal to a penetration direction of the at least one positioning through-hole.

6. The residual current circuit breaker according to claim 3, wherein: The fluxgate magnetic sensor is connected to a power source common to the first coil. The fluxgate magnetic sensor and the first coil are each connected to or disconnected from the power source by a common switch.

7. The residual current circuit breaker according to claim 3, wherein: The fluxgate magnetic sensor is connected to a power source common to the current flowing through the conductor, The fluxgate magnetic sensor is connected to a portion of the conductor on the downstream side of the current compared to a portion inserted through the fluxgate magnetic sensor.

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