CN104134556A - Operating mechanism and circuit breaker using same - Google Patents
Operating mechanism and circuit breaker using same Download PDFInfo
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- CN104134556A CN104134556A CN201310297839.1A CN201310297839A CN104134556A CN 104134556 A CN104134556 A CN 104134556A CN 201310297839 A CN201310297839 A CN 201310297839A CN 104134556 A CN104134556 A CN 104134556A
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- drive motors
- restrictor bar
- connecting rod
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Abstract
The invention relates to an operating mechanism and a circuit breaker using the same. The operating mechanism comprises a left break bar transmission structure, an intermediate break bar transmission structure and a right break bar transmission structure which are respectively used for being in transmission connection with a switching-closing break bar of each phase, two adjacent break bar transmission structures are in transmission connection via an inter-phase linkage rod, at least one driving motor is arranged at the left side and the right side of the intermediate break bar transmission structure respectively, and a power output end of each driving motor is in transmission connection with the corresponding inter-phase linkage rod via corresponding cylindrical gear transmission structure respectively. By the operating mechanism for the circuit breaker, provided by the invention, purchase cost of the driving motor can be reduced, and meanwhile, the synchronism among the break bar transmission structures of all phases is improved.
Description
Technical field
The present invention relates to field of circuit breakers, relate in particular to a kind of operating mechanism and use the circuit breaker of this operating mechanism.
Background technology
Primary cut-out is most important switchgear in electric power system, is undertaking the dual role of control and protection circuit, and the quality of its performance is one of key factor determining electric power system safety work.And the repertoire of primary cut-out is all embodied in deciliter action of dynamic and static contact, a deciliter action for dynamic and static contact realizes by operating mechanism, operating mechanism is the important component part of circuit breaker, it is the critical component that determines circuit breaker performance, the quality of its performance directly has influence on the technical performance of circuit breaker, so the functional reliability of circuit breaker depends on the Reliability of Microprocessor of operating mechanism to a great extent.
Because the requirement of the job specification of circuit breaker own makes its operating mechanism require to complete its operating process in millisecond, and this set of system being comprised of component of machine completely goes to realize, in fact to require be very high.From fault statistics numeral international, state's inner breaker, mechanical breakdown is in the great majority, up to 70% of total failare, therefore, today at circuit breaker to high voltage, large capacity, high reliability development, in order to meet the requirement of electric power system to high reliability, be necessary to study the operating mechanism that a kind of volume is little, simple in structure and motion process is controlled, for this reason, electric motor type operating mechanism is widely used in circuit breaker gradually.The breaker structure of existing use electric motor type operating mechanism is as shown in Figure 1: comprise the contact assembling that three-phase is set up in parallel, deciliter restrictor bar 10 that each contact assembling includes fixed contact 3 and moving contact 4 is housed, deciliter restrictor bar is driven by operating mechanism, operating mechanism comprises respectively and is in transmission connection to drive each deciliter reciprocating restrictor bar drive mechanism 20 of restrictor bar with each deciliter restrictor bar, restrictor bar drive mechanism can be connecting lever or bent axle, adjacent two restrictor bar drive mechanisms are in transmission connection by interphase connecting rod 6, one of them restrictor bar drive mechanism is in transmission connection by the clutch end of power transmission shaft 7 and a drive motors, drive motors can be servomotor or the controlled swing angle electric of output angle.During work, the power of drive motors is inputted by one of them restrictor bar drive mechanism, and by interphase connecting rod, is carried backward successively, thereby makes each restrictor bar drive mechanism drive respectively corresponding moving contact and fixed contact to complete divide-shut brake action.The problem that existing this operating mechanism exists is: 1, the output torque of drive motors cannot adapt to the three-phase breaker of 126Kv above, this is because the particularity of the drive motors of its use, rising along with electric pressure, the output torque of required drive motors is larger, the divide-shut brake speed of circuit breaker also needs to improve thereupon simultaneously, correspondence requires the rotating speed of drive motors also faster, so just causes the manufacturing cost of drive motors sharply to increase, 2, drive motors is all not identical apart from the distance of each phase restrictor bar drive mechanism, the phase from drive motors away from more, and synchronism is poorer, especially in open type circuit breaker, between phase and phase, there is clear and definite safe spacing demand, transmission stroke is longer, and accumulated deformation is larger, makes this shortcoming more obvious, 3, drive motors is arranged at one end of whole operating mechanism, cause power transmission shaft and the required peak torque of bearing of each interphase connecting rod larger, such as the moment of torsion of the required restrictor bar drive mechanism of every phase contact assembling divide-shut brake transmission is 1M, the outputting power of drive motors should be at least 3M so, the required peak torque of bearing of power transmission shaft being connected with drive motors is also just at least 3M, first, the required peak torque of bearing of interphase connecting rod between two-phase is at least 2M, second, the required peak torque of bearing of interphase connecting rod between three-phase is 1M at least, the requirement of strength of each connecting rod is higher, each connecting rod all needs to have larger physical dimension, not only increase the cost of manufacture of each connecting rod, the connecting rod of large-size has increased the quality of drive system simultaneously, this has just increased the energy consumption of drive motors, the required output torque of drive motors is larger.
Summary of the invention
The object of the present invention is to provide a kind of circuit breaker operating mechanism that can reduce drive motors acquisition cost, improve synchronism between each phase restrictor bar drive mechanism simultaneously; The present invention also aims to provide a kind of circuit breaker that uses this operating mechanism.
In order to address the above problem, in the present invention, the technical scheme of operating mechanism is:
Operating mechanism, comprise and be respectively used to corresponding each left side that mutually deciliter restrictor bar is in transmission connection, neutralize right restrictor bar drive mechanism, adjacent two restrictor bar drive mechanisms are in transmission connection by interphase connecting rod, the described middle restrictor bar drive mechanism left and right sides is furnished with respectively at least one drive motors, and the clutch end of each drive motors is in transmission connection with corresponding interphase connecting rod by each self-corresponding cylindricality gear transmission structure respectively.
Total number of drive motors is even number, and each drive motors is symmetrically arranged in the left and right sides of middle restrictor bar drive mechanism.
Described drive motors has two.
Described cylindricality gear transmission structure is a Column gear transmission pair, described Column gear transmission pair comprises with coaxial line fixed cover and is loaded on the first stud wheel on corresponding interphase connecting rod, Column gear transmission pair also comprise pivot center parallel with interphase connecting rod and with the second stud wheel of described the first stud wheel engaged transmission, the second stud wheel is in transmission connection with the power output shaft coaxial line of corresponding drive motors.
In the present invention, the technical scheme of circuit breaker is: circuit breaker, comprise that operating mechanism and three-phase are between left and right every the contact assembling being set up in parallel, deciliter restrictor bar that each contact assembling includes fixed contact and moving contact is housed, operating mechanism comprises the left side being in transmission connection with corresponding each phase deciliter restrictor bar respectively, neutralize right restrictor bar drive mechanism, adjacent two restrictor bar drive mechanisms are in transmission connection by interphase connecting rod, the described middle restrictor bar drive mechanism left and right sides is furnished with respectively at least one drive motors, the clutch end of each drive motors is in transmission connection with corresponding interphase connecting rod by each self-corresponding cylindricality gear transmission structure respectively.
Total number of drive motors is even number, and each drive motors is symmetrically arranged in the left and right sides of middle restrictor bar drive mechanism.
Described drive motors has two.
Described cylindricality gear transmission structure is a Column gear transmission pair, described Column gear transmission pair comprises with coaxial line fixed cover and is loaded on the first stud wheel on corresponding interphase connecting rod, Column gear transmission pair also comprise pivot center parallel with interphase connecting rod and with the second stud wheel of described the first stud wheel engaged transmission, the second stud wheel is in transmission connection with the power output shaft coaxial line of corresponding drive motors.
Circuit breaker also comprises with described each drive motors control connection to control the controller of described each drive motors synchronization action.
Beneficial effect of the present invention is: during use, at least two drive motors are together for whole operating mechanism provides power, compare by a drive motors and provide power for operating mechanism, reduced every output torque that drive motors is required, the acquisition cost sum of each small-power drive motors is significantly smaller than the acquisition cost of a high-power driving motor; Each drive motors is arranged in the left and right sides of middle restrictor bar drive mechanism in addition, has shortened the transmission distance between each phase restrictor bar drive mechanism and corresponding drive motors, has improved the synchronism of every restrictor bar drive mechanism; In addition, the reduction of every drive motors output torque, also makes the peak torque of the required carrying of interphase connecting rod reduce, and has so just reduced physical dimension and the weight of interphase connecting rod, reduce moment of inertia and the frictional resistance of drive system, thereby reduced the energy consumption of each drive motors.
Further, each drive motors is symmetrically arranged in the left and right sides of middle restrictor bar drive mechanism, middle restrictor bar drive mechanism is identical apart from the transmission distance of its both sides drive motors, each drive motors can centering restrictor bar drive mechanism the left and right sides produce nonsynchronous moment of torsion, both effectively guaranteed that middle restrictor bar drive mechanism can not damage because being subject to asynchronous " tearing " of each drive motors, effectively guaranteed again that each drive motors can be because of stress each other and affect useful life.
Further, each drive motors is in transmission connection with corresponding interphase connecting rod by Column gear transmission is secondary, has shortened the span of whole drive system on left and right directions, has both facilitated the layout of drive motors, has reduced again the physical dimension on circuit breaker left and right directions; Make in addition the transmission distance between each restrictor bar drive mechanism and corresponding drive motors all identical, really realize three-phase same period.
Accompanying drawing explanation
Fig. 1 is the structural representation of background technology in the present invention;
Fig. 2 is the transmission schematic diagram of an embodiment of circuit breaker in the present invention, is also the use state diagram of an embodiment of operating mechanism in the present invention simultaneously;
Fig. 3 is transmission schematic diagram when dynamic and static contact closes a floodgate in Fig. 2.
Embodiment
The embodiment of circuit breaker is as shown in Fig. 2 ~ 3: in the present embodiment, circuit breaker is open type circuit breaker, comprise that operating mechanism and three-phase are between left and right every the contact assembling 1 being set up in parallel, deciliter restrictor bar 10 that each contact assembling includes fixed contact 3 and moving contact 4 is housed, operating mechanism comprises the reciprocating left restrictor bar drive mechanism of corresponding each phase deciliter restrictor bar of driving respectively, middle restrictor bar drive mechanism and right restrictor bar drive mechanism, left, in, right restrictor bar drive mechanism is bent axle 8, between adjacent two restrictor bar drive mechanisms, by interphase connecting rod 6, be in transmission connection, operating mechanism also comprises two drive motors 5 that are symmetrically arranged in the middle restrictor bar drive mechanism left and right sides, drive motors is permanent-magnet servo motor, the clutch end of each drive motors is in transmission connection with corresponding interphase connecting rod by each self-corresponding cylindricality gear transmission structure respectively, cylindricality gear transmission structure is a Column gear transmission pair 15, Column gear transmission pair comprises the first stud wheel and second stud wheel of the transmission of intermeshing, wherein the first stud wheel coaxial line fixed cover is loaded on corresponding interphase connecting rod, the axis of the second stud wheel and the axis of interphase connecting rod be arranged in parallel, the power output shaft of each drive motors is in transmission connection with corresponding the second stud wheel coaxial line respectively.Circuit breaker also comprises with described two drive motors control connections to control the controller 12 of described two drive motors synchronization actions, and in figure, part 11 represents host computers, and part 13 represents storage capacitors, and part 14 represents power supplys.
Host computer is for the parameter setting of switch and the output of status signal, for different circuit breakers, different output parameters can be set, controller is synchronized with the movement for controlling two drive motors simultaneously, and storage capacitor provides energy for motor action, and with pulse-width adjustment method, adjusts the speed of motor.During work, the power of two drive motors imports respectively corresponding interphase connecting rod into by cylindricality gear transmission structure, then by corresponding interphase connecting rod, passes to corresponding restrictor bar drive mechanism in both sides to the left and right respectively, thereby drives each mutually dynamic and static Contact Breaking/Making Operations lock.Each restrictor bar drive mechanism adopts bent axle, makes each drive motors output 360 degree spinning movements can realize the divide-shut brake of dynamic and static contact, controls simple, easy to operate; The clutch end of drive motors is in transmission connection with corresponding interphase connecting rod by a cylindricality gear driving pair, cylindricality gear transmission structure simple in structure, and convenient making not only, and be conducive to reduce the energy consumption in transmission process; Compare a drive motors, the required output torque of two drive motors is all reduced, and has greatly reduced the acquisition cost of drive motors, also avoided because manufacturing the drive motors of high parameter, and the device fabrication causing is difficult simultaneously; Each restrictor bar drive mechanism is also all shortened apart from the transmission distance of drive motors, and the synchronism of each restrictor bar drive mechanism increases greatly; Left, to neutralize right restrictor bar drive mechanism identical apart from the transmission stroke of corresponding drive motors, the power of two drive motors arrives on each restrictor bar drive mechanism simultaneously, really realize three-phase same period, simultaneously, restrictor bar drive mechanism is can be because of the power of drive motors not asynchronous and be subject to " asynchronous tearing ", both guaranteed the useful life of middle restrictor bar drive mechanism, and also effectively protected each drive motors can not be subject to active force to each other and damaged; The moment of torsion of supposing the transmission of the required restrictor bar drive mechanism of every phase contact assembling divide-shut brake is 1M, the outputting power of each drive motors is 1.5M so, the required peak torque of bearing of each interphase connecting rod is down to 1.5M, a relative drive motors, structural strength and size that each interphase connecting rod is required reduce greatly, the miniaturization that is not only conducive to operating mechanism is made, and the reduction of drive system weight can also reduce moment of inertia and frictional resistance, the reduction of drive system transmission energy consumption, has further reduced the required output torque of drive motors.Operating mechanism in the present invention can also be for the circuit breaker of other type, and especially circuit breaker between phase and phase, has clear and definite insulation distance requirement, makes the advantage of this reduction moment of inertia and transmission resistance more obvious.
In other embodiment of this circuit breaker: circuit breaker can also be for 126KV(or more than 126KV) primary cut-out, now the peak torque of each drive motors reaches 400N m, angular acceleration reaches 25000rad/s, turn up 2500r/min, the even acceleration startup, uniform motion and the even deceleration that divide, close in process that can in 60ms, realize circuit breaker stop course of action; Each restrictor bar drive mechanism can be also connecting lever, and now each drive motors is by driving interphase connecting rod reciprocally swinging to realize dividing, closing a floodgate of corresponding dynamic and static contact; Certainly drive motors can be the controlled swing angle electric of output angle, and drive motors can not be also servomotor; Total number of drive motors is preferably even number, the drive motors number of the middle restrictor bar drive mechanism left and right sides can also be two, three or other number, the drive motors number of the middle restrictor bar drive mechanism left and right sides can be not identical yet, and each drive motors also can asymmetricly be arranged; Cylindricality gear transmission structure also can consist of two or more Column gear transmission pairs.
The embodiment of operating mechanism is as shown in Fig. 2 ~ 3: the concrete structure of operating mechanism is identical with the operating mechanism described in above-mentioned each circuit breaker embodiment, is not described in detail in this.
Claims (9)
1. operating mechanism, comprise and be respectively used to corresponding each left side that mutually deciliter restrictor bar is in transmission connection, neutralize right restrictor bar drive mechanism, adjacent two restrictor bar drive mechanisms are in transmission connection by interphase connecting rod, it is characterized in that: the described middle restrictor bar drive mechanism left and right sides is furnished with respectively at least one drive motors, and the clutch end of each drive motors is in transmission connection with corresponding interphase connecting rod by each self-corresponding cylindricality gear transmission structure respectively.
2. operating mechanism according to claim 1, is characterized in that: total number of drive motors is even number, and each drive motors is symmetrically arranged in the left and right sides of middle restrictor bar drive mechanism.
3. operating mechanism according to claim 1 and 2, is characterized in that: described drive motors has two.
4. operating mechanism according to claim 3, it is characterized in that: described cylindricality gear transmission structure is a Column gear transmission pair, described Column gear transmission pair comprises with coaxial line fixed cover and is loaded on the first stud wheel on corresponding interphase connecting rod, Column gear transmission pair also comprise pivot center parallel with interphase connecting rod and with the second stud wheel of described the first stud wheel engaged transmission, the second stud wheel is in transmission connection with the power output shaft coaxial line of corresponding drive motors.
5. circuit breaker, comprise that operating mechanism and three-phase are between left and right every the contact assembling being set up in parallel, deciliter restrictor bar that each contact assembling includes fixed contact and moving contact is housed, operating mechanism comprises the left side being in transmission connection with corresponding each phase deciliter restrictor bar respectively, neutralize right restrictor bar drive mechanism, adjacent two restrictor bar drive mechanisms are in transmission connection by interphase connecting rod, it is characterized in that: the described middle restrictor bar drive mechanism left and right sides is furnished with respectively at least one drive motors, the clutch end of each drive motors is in transmission connection with corresponding interphase connecting rod by each self-corresponding cylindricality gear transmission structure respectively.
6. circuit breaker according to claim 5, is characterized in that: total number of drive motors is even number, and each drive motors is symmetrically arranged in the left and right sides of middle restrictor bar drive mechanism.
7. according to the circuit breaker described in claim 5 or 6, it is characterized in that: described drive motors has two.
8. circuit breaker according to claim 7, it is characterized in that: described cylindricality gear transmission structure is a Column gear transmission pair, described Column gear transmission pair comprises with coaxial line fixed cover and is loaded on the first stud wheel on corresponding interphase connecting rod, Column gear transmission pair also comprise pivot center parallel with interphase connecting rod and with the second stud wheel of described the first stud wheel engaged transmission, the second stud wheel is in transmission connection with the power output shaft coaxial line of corresponding drive motors.
9. circuit breaker according to claim 5, is characterized in that: circuit breaker also comprises with described each drive motors control connection to control the controller of described each drive motors synchronization action.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310297839.1A CN104134556B (en) | 2013-07-16 | 2013-07-16 | Operating mechanism and circuit breaker using same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310297839.1A CN104134556B (en) | 2013-07-16 | 2013-07-16 | Operating mechanism and circuit breaker using same |
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| Publication Number | Publication Date |
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| CN104134556A true CN104134556A (en) | 2014-11-05 |
| CN104134556B CN104134556B (en) | 2017-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310297839.1A Active CN104134556B (en) | 2013-07-16 | 2013-07-16 | Operating mechanism and circuit breaker using same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111508769A (en) * | 2020-07-01 | 2020-08-07 | 广东电网有限责任公司东莞供电局 | Combined synchronous circuit breaker for power distribution network |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04129121A (en) * | 1990-09-19 | 1992-04-30 | Toshiba Corp | Vacuum circuit breaker |
| CN1572008A (en) * | 2001-08-15 | 2005-01-26 | Abb瑞士有限公司 | Switchgear |
| CN101256914A (en) * | 2008-03-05 | 2008-09-03 | 沈阳工业大学 | High-voltage circuit-breaker rotating servo motor operating mechanism |
| CN101582336A (en) * | 2009-06-15 | 2009-11-18 | 江苏省电力公司泰州供电公司 | Electric operation mechanism with double output shafts for AC high voltage isolating switch |
| CN201369252Y (en) * | 2008-11-26 | 2009-12-23 | 平高集团有限公司 | Universal transmission device and high voltage switch with same |
| CN202423101U (en) * | 2011-12-02 | 2012-09-05 | 安徽宇腾真空电气有限责任公司 | Permanent-magnetic vacuum circuit breaker |
| CN102903547A (en) * | 2011-07-25 | 2013-01-30 | Abb技术有限公司 | Drive unit for connection device |
| WO2013060675A1 (en) * | 2011-10-25 | 2013-05-02 | Alstom Technology Ltd | Electrical switching device at a junction point between two parts of a network |
-
2013
- 2013-07-16 CN CN201310297839.1A patent/CN104134556B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04129121A (en) * | 1990-09-19 | 1992-04-30 | Toshiba Corp | Vacuum circuit breaker |
| CN1572008A (en) * | 2001-08-15 | 2005-01-26 | Abb瑞士有限公司 | Switchgear |
| CN101256914A (en) * | 2008-03-05 | 2008-09-03 | 沈阳工业大学 | High-voltage circuit-breaker rotating servo motor operating mechanism |
| CN201369252Y (en) * | 2008-11-26 | 2009-12-23 | 平高集团有限公司 | Universal transmission device and high voltage switch with same |
| CN101582336A (en) * | 2009-06-15 | 2009-11-18 | 江苏省电力公司泰州供电公司 | Electric operation mechanism with double output shafts for AC high voltage isolating switch |
| CN102903547A (en) * | 2011-07-25 | 2013-01-30 | Abb技术有限公司 | Drive unit for connection device |
| WO2013060675A1 (en) * | 2011-10-25 | 2013-05-02 | Alstom Technology Ltd | Electrical switching device at a junction point between two parts of a network |
| CN202423101U (en) * | 2011-12-02 | 2012-09-05 | 安徽宇腾真空电气有限责任公司 | Permanent-magnetic vacuum circuit breaker |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111508769A (en) * | 2020-07-01 | 2020-08-07 | 广东电网有限责任公司东莞供电局 | Combined synchronous circuit breaker for power distribution network |
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| CN104134556B (en) | 2017-02-01 |
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