CN105280450A - Circuit breaker - Google Patents
Circuit breaker Download PDFInfo
- Publication number
- CN105280450A CN105280450A CN201410659078.4A CN201410659078A CN105280450A CN 105280450 A CN105280450 A CN 105280450A CN 201410659078 A CN201410659078 A CN 201410659078A CN 105280450 A CN105280450 A CN 105280450A
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- Prior art keywords
- circuit
- side terminal
- load side
- breaker
- bimetal piece
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/36—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electromagnetic release and no other automatic release
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/06—Housings; Casings; Bases; Mountings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/48—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having both electrothermal and electromagnetic automatic release
- H01H73/50—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having both electrothermal and electromagnetic automatic release reset by lever
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Breakers (AREA)
Abstract
The invention discloses a circuit breaker, which can prevent unnecessary operations caused by start inrush current and start current. The circuit breaker (1) comprises a bypass circuit that has a second double-metal member (29) which can be in touch with or separated from a load side terminal (6); the second double-metal member (29) moves in the following way: if the circuit breaker (1) is switched on or the power of a motor is on, the second double-metal member (29) is in contact with a contact part (6a) of the load side terminal (6) and is in parallel with a trip device (2) for the current flow; if a preset temperature is reached, the second double-metal member (29) is separated from the load side terminal (6), and the current only flows in the trip device (2).
Description
Technical field
The present invention relates to a kind of heat be installed in Inturruptor for sub-line etc. to move-the circuit-breaker of electromagnetic type or electromagnetic type completely.
Background technology
Existing heat moves-tripgear of the circuit-breaker of electromagnetic type, and as Patent Document 1, have: fixed iron core and movable core, they are formed by magnetic materials such as iron plates; And bimetal piece, it between fixed iron core, clamps heater and the flat heat responsive element be fixed integratedly.
In such circuit-breaker, if electric current flows in conductor and the heater that is connected with shunt terminal, then produce the magnetic flux passed from fixed iron core and movable core.When the tripping operation caused by electromagnetism, utilize the attraction produced by this magnetic flux, movable core overcomes the elastic force of back-moving spring and is attracted to fixed iron core, automatically disconnects.In addition, when moving by heat the tripping operation caused, utilize the flexure operation of bimetal piece, the trip(ping) bar of open-close mechanism section is rotated, and automatically disconnects.
But in motor circuit, usually, the overload protection of motor is undertaken by electromagnetism shutter, circuit-breaker arranges for the purpose of the short-circuit protection of circuit.But for the purpose of economy; there is the circuit breaker being called motor cutter as follows, it not only carries out overload protection and short-circuit protection, also carries out the starting of motor, stopping; it uses in the motor of rated specification lower (such as, being less than or equal to 225A).
Patent documentation 1: Japanese Unexamined Patent Publication 8-96689 publication
In existing circuit-breaker as above, there are the following problems, namely, when motor starting, produce by the very large electric current only flowed when the 1st initial ripple start the instantaneous trip apparatus that surge current causes unnecessary action, by starting surge current during at motor starting after the unnecessary action of over current trip that causes of the starting current of flowing during multiple cycle, circuit is switched off automatically, and normally cannot carry out starting and the stopping of motor.Prevent the motion of global warming for background with international in recent years, advancing the use of more efficient motor, there is starting surge current and also become large tendency, therefore, there is existing motor cutter and become the problem that cannot use.
In addition, if by starting the unnecessary action that causes of surge current, make the instantaneous tripping current value of circuit-breaker increase to prevent, then the conducting parts such as heater of circuit breaker internal likely fuses.If in order to prevent this fusing from making the capacity of conducting parts increase, then cannot tripping characteristic be obtained.Owing to there is such trade-off relation, therefore, be difficult to realize to guarantee tripping characteristic simultaneously and do not occur by the unnecessary action of starting surge current and causing, the problem of Here it is available circuit circuit breaker.
Summary of the invention
The present invention proposes to solve problem as above, its object is to obtain a kind of circuit-breaker, and this circuit-breaker can prevent the unnecessary action caused by starting surge current and starting current.
Circuit-breaker involved in the present invention has: fixed contact therefor, and it is connected with power supply side terminal; Movable contact, it is arranged to contact with this fixed contact therefor and to be separated; Over current trip, it is configured between movable contact and load side terminal, if flow through the overcurrent being more than or equal to the setting set out based on rated current, then automatically disconnects; And bypass resistance, it has switch portion, and switch portion and over current trip are connected in parallel, and is arranged to contact with load side terminal and to be separated, in this circuit-breaker, the switch portion of bypass resistance carries out action as follows, that is, when the power supply of load is connected, contact with load side terminal and flow through electric current in parallel with over current trip, if electric current is then separated with load side terminal within reaching the prescribed limit of rated current, electric current is only flowed in over current trip.
The effect of invention
According to the present invention, due to when the power supply of load is connected, the switch portion of bypass resistance contacts with load side terminal, and flow through electric current in parallel with tripgear, therefore, the electric current flowed in over current trip can be made to reduce, the unnecessary action caused by starting surge current and starting current can be prevented.In addition, if within electric current reaches the prescribed limit of rated current, then switch portion is separated with load side terminal, and electric current only flows in over current trip, therefore, it is possible to the common overload implementing to be undertaken by over current trip detects.
Accompanying drawing explanation
Fig. 1 is the end view of the closed circuit state of the circuit-breaker represented involved by embodiments of the present invention 1.
Fig. 2 is the end view of the open-circuit condition of the circuit-breaker represented involved by embodiments of the present invention 1.
Fig. 3 is the tripgear of the circuit-breaker represented involved by embodiments of the present invention 1 and the partial side view of bypass resistance.
Fig. 4 is the partial side view of the switch portion of the circuit-breaker represented involved by embodiments of the present invention 1.
Fig. 5 is the end view of the open-circuit condition of the circuit-breaker represented involved by embodiments of the present invention 2.
Fig. 6 is the tripgear of the circuit-breaker represented involved by embodiments of the present invention 3 and the partial side view of bypass resistance.
Fig. 7 is the tripgear of the circuit-breaker represented involved by embodiments of the present invention 3 and the partial side view of bypass resistance.
Fig. 8 is the oblique view of the tripgear representing existing circuit-breaker.
Fig. 9 is the end view of the tripgear representing existing circuit-breaker.
The explanation of label
1, 1A, 1B circuit-breaker, 2, 2A, 2B tripgear, 3 pedestals, 4 cover bodies, 5 power supply side terminals, 6 load side terminal, 6a contact site, 7 fixed contact therefors, 8 movable contact, 9 movable piece framves, 10 mounting screws, 11 open-close mechanism sections, 11a trip(ping) bar, 21 fixed iron cores, 21a carbine lacing film portion, 21b bridge part, 21c sidewall portion, 21d magnetic pole, 21e retainer, 22 heaters, 22a heater portion, 23 bimetal piece, 24 flexible copper twisted wires, 25 adjustment screws, 26 retainer nuts, 27 movable cores, 27a is attracted portion, 27b bearing portion, 27c operating sheet portion, 28 back-moving springs, 29 the 2nd bimetal piece, 30 leaf springs, 31 yokes, 32 armature, 33 back-moving springs, 34 coils, 35 oil bumpers, 36 flexible connection lines, 37 the 3rd bimetal piece, 38 energising brackets, 38a axis hole, 39 the 2nd movable cores, 40 back-moving springs, 41 the 2nd fixed iron cores.
Embodiment
Reference example 1.
As reference example of the present invention, to the existing heat shown in the structure identical with patent documentation 1 and Fig. 8 and Fig. 9 move-tripgear of the circuit-breaker of electromagnetic type is described.Fig. 8 and Fig. 9 represents that existing heat is moved-oblique view of the important part of the tripgear of the circuit-breaker of electromagnetic type and end view.
Fixed iron core 51 is formed as tabular by magnetic materials such as iron plates.Magnet support 52 is formed by the nonmagnetic substances such as stainless-steel sheet are bent into " コ " shape, the opposite side obtained after being bent into " コ " shape, there is in bottom a pair retainer 52a, there is in upper end a pair carbine lacing film 52b, at central portion, there is a pair U-shaped groove 52c.
Heater 53 is L-shaped, is connected with the internal thread part 53a fastening with shunt terminal in its bottom, is connected with the bonding conductor 54 be connected with load side terminal 6 in upper end.Flat bimetal piece 55 is between fixed iron core 51, and clamping heater 53 and magnet support 52, utilize rivet 56 and fixed integratedly.At the free end of bimetal piece 55, utilize retainer nut 58 mounting and adjusting screw 57, hot operating characteristics is adjusted.
Movable core 59 becomes " コ " shape by magnetic material buckles such as iron plates and is formed.Movable core 59 has: a pair movable plate 59a, and they are relative with fixed iron core 51; Bearing portion 59b, it is arranged at an opposite side; Operating sheet 59c, its be arranged at extend upward, be bent into " コ " shape and the front end of the side obtained; And protruding 59d, the bottom surface of shape that it is arranged at " コ ".The trip(ping) bar of operating sheet 59c to open-close mechanism section presses, and protruding 59d is pushed to the retainer 52a of magnet support 52.
Two back-moving springs 60 turning round type are supported in the central portion of movable core 59 by axle 61 earth's axis free to rotate, and two foot 60a turned round in shape is hooked on the carbine lacing film 52b of magnet support 52.Further, this axle 61 is inserted into a pair U-shaped groove 52c of magnet support 52.
In the tripgear formed in the above described manner, if electric current flows in conductor 54 and the heater 53 that is connected with shunt terminal, then produce the magnetic flux through fixed iron core 51 and movable core 59.When the tripping operation caused by electromagnetism, utilize the attraction produced by this magnetic flux, movable core 59 overcomes the elastic force of back-moving spring 60 and is attracted to fixed iron core 51, and the trip(ping) bar of open-close mechanism section rotates, and automatically disconnects.When moving by heat the tripping operation caused, the trip(ping) bar of open-close mechanism section is rotated by the flexure operation of bimetal piece 55, automatically disconnects.
In addition, in above-mentioned tripgear, when larger starting surge current when having flow through motor starting, sometimes movable core 59 also can be made to carry out action with the connection of circuit-breaker is side by side instantaneous, or bimetal piece 55 utilizes the starting current of the motor continuing multiple cycle and is heated hastily, before reaching stabling current, circuit breaker is made to carry out unnecessary action.
In following illustrated embodiments of the present invention 1 ~ execution mode 3, to prevent for the purpose of the unnecessary action caused by starting surge current and starting current as above, a kind of structure being provided with bypass resistance is provided, this bypass resistance has switch portion, this switch portion and tripgear are connected in parallel, and are arranged to contact with load side terminal and to be separated.
Execution mode 1.
Below, based on accompanying drawing, the circuit-breaker involved by embodiments of the present invention 1 is described.Fig. 1 and Fig. 2 is the end view of the circuit-breaker represented involved by present embodiment 1, and be respectively Fig. 1 and represent closed circuit state, Fig. 2 represents open-circuit condition.In addition, Fig. 3 is the tripgear of the circuit-breaker represented involved by present embodiment 1 and the partial side view of bypass resistance.In addition, in the various figures, to identical or considerable part, identical label is marked.
As shown in Figures 1 and 2, circuit-breaker 1 involved by present embodiment 1 comprises over current trip 2 (hreinafter referred to as tripgear 2), power supply side terminal 5, load side terminal 6, fixed contact therefor 7, movable contact 8, open-close mechanism section 11 and the pedestal 3 be made up of synthetic resin material and cover body 4 etc. and forms.
Fixed contact therefor 7 is connected with power supply side terminal 5.Movable contact 8 and fixed contact therefor 7 relatively configure, and are arranged to contact with fixed contact therefor 7 and to be separated.Movable contact 8 is connected with tripgear 2 by movable piece frame 9.
Being configured at the tripgear 2 between movable contact 8 and load side terminal 6, when flowing through the overcurrent being more than or equal to the setting set out based on rated current, automatically disconnecting, be connected with movable piece frame 9 by mounting screw 10.Open-close mechanism section 11 has trip(ping) bar 11a, and this trip(ping) bar 11a is pressed by the action of tripgear 2, and circuit-breaker 1 is tripped.
The structure of Fig. 1 ~ Fig. 3 to the tripgear 2 of present embodiment 1 is utilized to be described.Tripgear 2 has fixed iron core 21, heater 22, bimetal piece 23, flexible copper twisted wire 24, adjustment screw 25, retainer nut 26, movable core 27 and back-moving spring 28.
Fixed iron core 21 is integrally formed with carbine lacing film portion 21a, bridge part 21b, pair of sidewalls portion 21c and a pair magnetic pole 21d.Movable core 27 is integrally formed with by a slice magnetic materials such as iron plates the portion that is attracted 27a, the pair of bearings portion 27b and operating sheet portion 27c that are called as movable plate.The portion that the is attracted 27a of movable core 27 is relative with the magnetic pole 21d of fixed iron core 21.
Movable core 27 in FIG with the bearing portion of pedestal 3 (omit diagram) for pivot, the pretension counterclockwise by back-moving spring 28, is stoped the movement of this movable core 27 by the retainer (omitting diagram) of pedestal 3.
In addition, an end of heater 22 is connected with movable piece frame 9, and another end and bimetal piece 23 are fixed.Bimetal piece 23 is the metal bond plates of being fitted by two panels metallic plates different for coefficient of thermal expansion, is corresponding with the change of temperature and carry out the heat responsive element that bends, is configured between movable contact 8 and load side terminal 6, and is energized.
Bimetal piece 23 is connected via flexible copper twisted wire 24 with load side terminal 6.In addition, the bottom of bimetal piece 23 contacts with the 22a face, heater portion of heater 22.Thus, bimetal piece 23 is electrically connected with movable piece frame 9 and movable contact 8, and is heated by heater portion 22a.
That is, bimetal piece 23 utilizes by being energized the spontaneous heating that causes and both heating of being undertaken by heater portion 22a and heat up.Utilize retainer nut 26 at the free end of bimetal piece 23 and adjustment screw 25 is installed.Utilize this adjustment screw 25, the hot operating characteristics of bimetal piece 23 can be adjusted.
Circuit-breaker 1 involved by present embodiment 1 has bypass resistance, and this bypass resistance has switch portion, and this switch portion and this tripgear 2 are connected in parallel, and is arranged to contact with load side terminal 6 and to be separated.In present embodiment 1, have the 2nd bimetal piece 29 as switch portion, as shown in Figure 3, an end of the 2nd bimetal piece 29 is connected to the connecting portion be connected with heater 22 of bimetal piece 23.In addition, Fig. 3 illustrates under the closed circuit state of circuit-breaker 1, the state after the 2nd bimetal piece 29 is separated with load side terminal 6.
The bypass resistance of present embodiment 1 comprises load side terminal 6, the 2nd bimetal piece 29, bimetal piece 23 and heater 22, but is not limited thereto, and also can comprise other electroconductive components.But in bypass resistance, an end of the 2nd bimetal piece 29 is fixed in the electroconductive component be electrically connected with movable contact 8.
2nd bimetal piece 29 carries out action as follows, namely, when circuit-breaker 1 is connected or as the motor of load power supply connect time, contact with the contact site 6a of load side terminal 6, and flow through electric current in parallel with tripgear 2, if reach set point of temperature, be then separated with load side terminal 6, electric current is only flowed in tripgear 2.
If overload electric current from power supply side terminal 5 to determine the path flow of contact 7, movable contact 8, movable piece frame 9, heater 22, bimetal piece 23, flexible copper twisted wire 24, load side terminal 6, then the bimetal piece 23 of tripgear 2 heated up by the heating undertaken by heater portion 22a and spontaneous heating, bending.Utilize this to bend, the adjustment screw 25 being installed on bimetal piece 23 presses trip(ping) bar 11a, open-close mechanism section 11 action and circuit-breaker 1 is tripped.
In addition, if the big current such as short circuit current flow in bimetal piece 23, then fixed iron core 21 is significantly magnetized by the large magnetic flux produced by this big current, and the portion that the is attracted 27a of movable core 27 is subject to magnetic pole 21d instantaneously and attracts.Utilize this attraction, movable core 27 overcomes the elastic force of back-moving spring 28 and rotates, and operating sheet portion 27c presses trip(ping) bar 11a and circuit-breaker 1 is tripped.
On the other hand, if relative to starting surge current, the starting current of the temporary flow when motor starting, carry out the above-mentioned automatic disconnection caused by tripgear 2, then cannot normal starting motor.Therefore, circuit-breaker 1 involved by present embodiment 1 has bypass resistance, this bypass resistance is using the 2nd bimetal piece 29 as switch portion, thus, when circuit-breaker 1 is connected or when the power supply of motor connects, the electric current of flowing in tripgear 2 is reduced, prevents by the unnecessary action of starting surge current, starting current causes.
In addition, obtain the temperature of the 2nd bimetal piece 29 when the after-current of the power supply connection of motor reaches 80% ~ 100% of rated current, be set as, if reach this temperature, then the 2nd bimetal piece 29 is separated with load side terminal 6.Therefore, when not producing starting current, electric current only flows in tripgear 2, can carry out common overload detection.
But be configured to, when flowing the larger short circuit accident electric current having and exceed and start surge current, even if the 2nd bimetal piece 29 contacts with load side terminal 6, formation parallel circuits, tripgear 2 also instantaneous operation, makes circuit-breaker 1 trip.
In addition, as shown in Figure 4, by replacing the contact site 6a contacted with the 2nd bimetal piece 29 of load side terminal 6, and leaf spring 30 is set to the contact site contacted with the 2nd bimetal piece 29 of load side terminal 6, thus utilize the deflection of leaf spring 30, can adjust with the separating distance of higher precision to the 2nd bimetal piece 29.Thus, such as, also can be set as, in the scope of 95% ~ 100% reaching rated current, the 2nd bimetal piece 29 is separated with load side terminal 6.
In addition, the contact site 6a contacted with the 2nd bimetal piece 29 of load side terminal 6 also can arrange microswitch (omit and illustrate).Microswitch has actuator in outside, has contact portion and snap action structural portion in the housing of insulating properties.
By making the 2nd bimetal piece 29 contact with the actuator portion of microswitch, thus can make to contact with the 2nd bimetal piece 29 in load side terminal 6, the electric arc that produces when being separated produces in the housing of microswitch.Thereby, it is possible to guarantee the contact reliability of load side terminal 6 and the 2nd bimetal piece 29, the long lifetime of contact site can be realized.
As mentioned above, circuit-breaker 1 according to the present embodiment involved by 1, owing to being formed as, there is bypass resistance, this bypass resistance has the 2nd bimetal piece 29, 2nd bimetal piece 29 is arranged to contact with load side terminal 6 and to be separated, when circuit-breaker 1 is connected or when the power supply of motor connects, 2nd bimetal piece 29 contacts with the contact site 6a of load side terminal 6, and flow through electric current in parallel with tripgear 2, therefore, the electric current of flowing in tripgear 2 can be made to reduce, can prevent by starting surge current, the unnecessary action that starting current causes.
In addition, be formed as, if reach set point of temperature, then the 2nd bimetal piece 29 is separated with load side terminal 6, and electric current only flows in tripgear 2, therefore, it is possible to carry out common overload detection, normally can carry out starting and the stopping of motor.
Execution mode 2.
Fig. 5 is the end view of the open-circuit condition of the circuit-breaker represented involved by embodiments of the present invention 2.In present embodiment 2, in the circuit-breaker 1A with the structure tripgear 2A different from above-mentioned execution mode 1, there is the bypass resistance be connected in parallel with tripgear 2A, use the 3rd bimetal piece 37 as this switch portion.In addition, for part identical or suitable with Fig. 1 in Fig. 5, mark identical label, and omit the description.
The tripgear 2A of circuit-breaker 1A is described.At the fixed part of the yoke 31 of L-shaped, be movably supported with armature 32.This armature 32 remains on assigned position by back-moving spring 33.An end of coil 34 is connected with movable contact 8 via flexible connection line 36, and another end is connected with load side terminal 6.In this coil 34, insert oil bumper 35, oil bumper 35 1 ends and armature 32 are oppositely disposed.
In addition, circuit-breaker 1A has bypass resistance, and this bypass resistance has switch portion, and this switch portion is arranged to contact with load side terminal 6 and to be separated.In present embodiment 2, use the 3rd bimetal piece 37 as switch portion, form the bypass resistance in parallel with tripgear 2A.An end of the 3rd bimetal piece 37 is connected with the end of movable contact 8 side of coil 34.That is, bypass resistance comprises one end of coil 34, load side terminal 6 and the 3rd bimetal piece 37, but is not limited thereto, and also can comprise other electroconductive components.
3rd bimetal piece 37 carries out action as follows, namely, when circuit-breaker 1A connects or when the power supply of motor connects, contact with load side terminal 6, electric current is flow through in parallel with tripgear 2A, if reach set point of temperature, be then separated with load side terminal 6, electric current is only flowed in tripgear 2A.
If overload electric current from power supply side terminal 5 with the path flow of fixed contact therefor 7, movable contact 8, flexible connection line 36, coil 34, load side terminal 6, iron core then in oil bumper 35 is movable, thus, magnetic flux density becomes large, and armature 32 is attracted to oil bumper 35.By this action, armature 32 presses trip(ping) bar 11a, and open-close mechanism section 11 carries out action, and circuit-breaker 1A is tripped.
In addition, if in coil 34 big current such as short circuit current flow, then due to leakage flux, armature 32 is attracted to oil bumper 35 instantaneously.By this action, armature 32 presses trip(ping) bar 11a, and circuit-breaker 1A is tripped.
On the other hand, if relative to starting surge current, the starting current of the temporary flow when motor starting, carry out the above-mentioned automatic disconnection caused by tripgear 2A, then cannot normal starting motor.Therefore, circuit-breaker 1A involved by present embodiment 2 has the bypass resistance using the 3rd bimetal piece 37 as switch portion, thus can make when circuit-breaker 1A connects or motor power supply connect time, the electric current flowed in tripgear 2A reduces, and can prevent by the unnecessary action of starting surge current, starting current causes.
In addition, obtain the temperature of the 3rd bimetal piece 37 when the after-current of the power supply connection of motor reaches 80% ~ 100% of rated current, be set as, if reach this temperature, then the 3rd bimetal piece 37 is separated with load side terminal 6.Therefore, when not producing starting current, electric current only flows in tripgear 2A, can carry out common overload detection.
But be configured to, when flowing the larger short circuit accident electric current having and exceed and start surge current, even if the 3rd bimetal piece 37 contacts with load side terminal 6, formation parallel circuits, tripgear 2A also instantaneous operation, makes circuit-breaker 1A trip.
In present embodiment 2, and in above-mentioned execution mode 1, replace contact site 6a and leaf spring 30 to be set to contact site identical, also leaf spring can be set at the contact site contacted with the 3rd bimetal piece 37 of load side terminal 6.Thus, such as, can be set as, in the scope of 95% ~ 100% reaching rated current, the 3rd bimetal piece 37 is separated with load side terminal 6.
And then, also can with in above-mentioned execution mode 1, the contact site 6a contacted with the 2nd bimetal piece 29 of load side terminal 6 is provided with microswitch identical, microswitch (omit and illustrate) is set at the contact site contacted with the 3rd bimetal piece 37 of load side terminal 6.Thereby, it is possible to guarantee the contact reliability of load side terminal 6 and the 3rd bimetal piece 37, the long lifetime of contact site can be realized.
In the circuit-breaker 1A involved by present embodiment 2, identical with above-mentioned execution mode 1, also can prevent from, by the unnecessary action of starting surge current, starting current causes, normally can carrying out starting and the stopping of motor.
Execution mode 3.
Fig. 6 is the partial side view of the tripgear of the circuit-breaker represented involved by present embodiment 3, and Fig. 7 represents in the circuit-breaker involved by present embodiment 3, starts the partial side view of the state of tripgear when surge current is energized.In addition, the overall structure of the circuit-breaker 1B involved by present embodiment 3, due to identical with above-mentioned execution mode 1, therefore continued to use Fig. 1 and is described.
The structure of the tripgear 2B of circuit-breaker 1B, except having energising bracket 38, identical with above-mentioned execution mode 1, wherein, this energising bracket 38 is electrically coupled with heater 22 and bimetal piece 23.In addition, at the tripping action caused by tripgear 2B when having an overload electric current that flows, due to identical with above-mentioned execution mode 1 and omit the description.
As the switch portion of bypass resistance in circuit-breaker 1B, have: the 2nd fixed iron core 41, it is arranged at load side terminal 6; And the 2nd movable core 39, itself and the 2nd fixed iron core 41 relatively configure.An end of the 2nd movable core 39 is rotatably installed on energising bracket 38, and this energising bracket 38 is the electroconductive components be electrically connected with movable contact 8.
In figure 6, the 2nd movable core 39 with the axis hole 38a of the bracket 38 that is energized for pivot, the pretension clockwise by back-moving spring 40, one end thereof be fixed unshakable in one's determination 21 retainer 21e stop and cannot move.That is, the bypass resistance of present embodiment 3 comprises load side terminal 6, the 2nd fixed iron core 41, the 2nd movable core 39 and energising bracket 38, but is not limited thereto.
In the circuit-breaker 1B that such as aforesaid way is formed, surge current, starting current is started if flow through in load side terminal 6, then the 2nd fixed iron core 41 is magnetized, as shown in Figure 7,2nd movable core 39 is attracted and is contacted with the 2nd fixed iron core 41, forms the bypass resistance in parallel with tripgear 2B.This bypass resistance was formed before the movable core 27 of tripgear 2B is attracted to the action of fixed iron core 21.Thereby, it is possible to make the electric current flowed in tripgear 2B reduce, the unnecessary action of the circuit-breaker 1B caused by starting surge current, starting current can be prevented.
But be configured to, when flowing the larger short circuit accident electric current having and exceed and start surge current, even if the 2nd movable core 39 contacts with the 2nd fixed iron core 41, formation parallel circuits, tripgear 2B is action instantaneously also, makes circuit-breaker 1B trip.
In addition, the structure comprising the bypass resistance of energising bracket 38, the 2nd movable core 39 and the 2nd fixed iron core 41 of present embodiment 3, due to the impact of not being heated, therefore, even if when being heated to starting (hot exposure) motor under state to a certain degree from circuit-breaker 1B, also can prevent by the unnecessary action of starting surge current, starting current causes.
In addition, in present embodiment 3, identical with above-mentioned execution mode 1, microswitch (omitting diagram) also can be set at the 2nd fixed iron core 41 place being arranged at load side terminal 6.Thereby, it is possible to guarantee the contact reliability of the 2nd fixed iron core 41 and the 2nd movable core 39, the long lifetime of contact site can be realized.
In the circuit-breaker 1B involved by present embodiment 3, also can obtain the effect identical with above-mentioned execution mode 1, and, the unnecessary action that starting surge current when can prevent the hot exposure by motor, starting current cause.In addition, the present invention, in its scope of invention, can carry out independent assortment to each execution mode, or suitably be out of shape each execution mode, omit.
Industrial applicibility
The present invention can move as the heat be installed in Inturruptor for sub-line etc.-electromagnetic type or completely electromagnetic type circuit-breaker and utilize.
Claims (11)
1. a circuit-breaker, it has: fixed contact therefor (7), and it is connected with power supply side terminal (5); Movable contact (8), it is arranged to contact with this fixed contact therefor (7) and to be separated; Over current trip (2,2A, 2B), it is configured between described movable contact (8) and load side terminal (6), if flow through the overcurrent being more than or equal to the setting set out based on rated current, then automatically disconnect; And bypass resistance, it has switch portion, and described switch portion and described over current trip (2,2A, 2B) are connected in parallel, and are arranged to contact with described load side terminal (6) and to be separated,
The feature of this circuit-breaker is,
The described switch portion of described bypass resistance carries out action as follows, namely, when the power supply of load is connected, contact with described load side terminal (6) and flow through electric current in parallel with described over current trip (2,2A, 2B), if within electric current reaches the prescribed limit of rated current, then be separated with described load side terminal (6), make electric current only flowing in described over current trip (2,2A, 2B).
2. circuit-breaker according to claim 1, is characterized in that,
Described over current trip (2,2B) has: fixed iron core (21); Movable core (27), it is relative with the magnetic pole (21d) of this fixed iron core (21); And bimetal piece (23), it is configured between described movable contact (8) and described load side terminal (6), and be energized, described over current trip (2,2B) is attracted to the action of described fixed iron core (21) or the flexure operation of described bimetal piece (23) by described movable core (27), and automatically disconnects.
3. circuit-breaker according to claim 2, is characterized in that,
Described bypass resistance has the 2nd bimetal piece (29) as described switch portion, and an end of described 2nd bimetal piece (29) is fixed in the electroconductive component be electrically connected with described movable contact (8).
4. circuit-breaker according to claim 3, is characterized in that,
After the power supply of described load is connected, described 2nd bimetal piece (29) if reach set point of temperature, is then separated with described load side terminal (6).
5. circuit-breaker according to claim 2, is characterized in that,
Described bypass resistance has the 2nd fixed iron core (41) as described switch portion and the 2nd movable core (39), wherein, 2nd fixed iron core (41) is arranged at described load side terminal (6), 2nd movable core (39) and described 2nd fixed iron core (41) relatively configure, and an end of described 2nd movable core (39) is rotatably installed on the electroconductive component (38) be electrically connected with described movable contact (8).
6. circuit-breaker according to claim 1, is characterized in that,
Described over current trip (2A) has: the yoke (31) of L-shaped, and it has fixed part; Armature (32), it is movably supported on the described fixed part of this yoke (31); Back-moving spring (33), described armature (32) is held in assigned position place by it; Coil (34), one end thereof is connected with described movable contact (8), and another end is connected with described load side terminal (6); And oil bumper (35), it is inserted in described coil (34), and an end and described armature (32) are oppositely disposed, described over current trip (2A) is attracted to the action of described oil bumper (35) by described armature (32), and automatically disconnects.
7. circuit-breaker according to claim 6, is characterized in that,
Described bypass resistance has the 3rd bimetal piece (37) as described switch portion, and a described end of the 3rd bimetal piece (37) is connected with the described end of described movable contact (8) side of described coil (34).
8. circuit-breaker according to claim 7, is characterized in that,
After the power supply of described load is connected, described 3rd bimetal piece (37) if reach set point of temperature, is then separated with described load side terminal (6).
9. the circuit-breaker according to claim 3 or 7, is characterized in that,
Described load side terminal (6) is provided with leaf spring (30) at the contact site contacted with described switch portion.
10. circuit-breaker according to claim 1, is characterized in that,
The contact site that described load side terminal (6) is contacting with described switch portion is provided with microswitch.
11. circuit-breakers according to claim 1, is characterized in that,
Described bypass resistance is configured to, and after the power supply of described load is connected, if become the electric current of 80% ~ 100% of rated current, then described switch portion is separated with described load side terminal (6).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014-110891 | 2014-05-29 | ||
| JP2014110891A JP6218675B2 (en) | 2014-05-29 | 2014-05-29 | Circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105280450A true CN105280450A (en) | 2016-01-27 |
| CN105280450B CN105280450B (en) | 2018-04-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410659078.4A Active CN105280450B (en) | 2014-05-29 | 2014-11-18 | Circuit-breaker |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6218675B2 (en) |
| KR (1) | KR101608592B1 (en) |
| CN (1) | CN105280450B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112514018A (en) * | 2018-07-31 | 2021-03-16 | 三菱电机株式会社 | Circuit breaker |
| TWI818266B (en) * | 2020-07-08 | 2023-10-11 | 日商三菱電機股份有限公司 | circuit breaker |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109313843A (en) * | 2016-06-07 | 2019-02-05 | 金泰克斯公司 | For allowing the vehicle trainable transceiver of the data transmission based on cloud between vehicle |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0896689A (en) * | 1994-09-28 | 1996-04-12 | Mitsubishi Electric Corp | Trip device of circuit breaker |
| CN1304154A (en) * | 2000-01-12 | 2001-07-18 | 河村电器产业株式会社 | Electromagnetic apparatus of circuit breaker |
| CN1444788A (en) * | 2000-08-22 | 2003-09-24 | 三菱电机株式会社 | Ground fault interrupter |
| CN202423173U (en) * | 2011-11-15 | 2012-09-05 | 施耐德电器工业公司 | Tripping mechanism of surge protector and surge protector |
| CN203103945U (en) * | 2013-02-21 | 2013-07-31 | 乐清市稳宝电子电气有限公司 | Surge protector |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60136457U (en) * | 1984-02-23 | 1985-09-10 | 三菱電機株式会社 | circuit break |
| JPS60174163U (en) * | 1984-04-26 | 1985-11-18 | 三菱電機株式会社 | circuit break |
| JP2001135204A (en) * | 1999-11-10 | 2001-05-18 | Hitachi Ltd | Transient current preventing unit in incoming substation facility |
-
2014
- 2014-05-29 JP JP2014110891A patent/JP6218675B2/en active Active
- 2014-08-27 KR KR1020140112256A patent/KR101608592B1/en active IP Right Grant
- 2014-11-18 CN CN201410659078.4A patent/CN105280450B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0896689A (en) * | 1994-09-28 | 1996-04-12 | Mitsubishi Electric Corp | Trip device of circuit breaker |
| CN1304154A (en) * | 2000-01-12 | 2001-07-18 | 河村电器产业株式会社 | Electromagnetic apparatus of circuit breaker |
| CN1444788A (en) * | 2000-08-22 | 2003-09-24 | 三菱电机株式会社 | Ground fault interrupter |
| CN202423173U (en) * | 2011-11-15 | 2012-09-05 | 施耐德电器工业公司 | Tripping mechanism of surge protector and surge protector |
| CN203103945U (en) * | 2013-02-21 | 2013-07-31 | 乐清市稳宝电子电气有限公司 | Surge protector |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112514018A (en) * | 2018-07-31 | 2021-03-16 | 三菱电机株式会社 | Circuit breaker |
| CN112514018B (en) * | 2018-07-31 | 2023-09-19 | 三菱电机株式会社 | Circuit breaker |
| TWI818266B (en) * | 2020-07-08 | 2023-10-11 | 日商三菱電機股份有限公司 | circuit breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2015225796A (en) | 2015-12-14 |
| JP6218675B2 (en) | 2017-10-25 |
| KR101608592B1 (en) | 2016-04-01 |
| KR20150137941A (en) | 2015-12-09 |
| CN105280450B (en) | 2018-04-17 |
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