CN102420048A - Supply current transformer with standby magnetic tripping function - Google Patents
Supply current transformer with standby magnetic tripping function Download PDFInfo
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- CN102420048A CN102420048A CN2011103745582A CN201110374558A CN102420048A CN 102420048 A CN102420048 A CN 102420048A CN 2011103745582 A CN2011103745582 A CN 2011103745582A CN 201110374558 A CN201110374558 A CN 201110374558A CN 102420048 A CN102420048 A CN 102420048A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
- H01F38/30—Constructions
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/10—Composite arrangements of magnetic circuits
- H01F3/12—Magnetic shunt paths
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Abstract
The invention relates to a supply current transformer with a standby magnetic tripping function; the supply current transformer is characterized in that a stationary iron core wound with a secondary coil forms a main closed loop magnetic circuit at the periphery of a primary conductor; a movable iron core forms an open loop magnetic circuit and can rotate around a rotating shaft of a coupling mechanism; a restoring spring is connected between a shell support and the movable iron core; the movable iron core and the stationary iron core can be pulled in or separated to form a gap H under the control of primary electric current; the size of the thickness of the gas inversely changes along with the size change of the primary electric current; and the size of the elastic acting force of the restoring spring inversely changes along with the size change of the thickness of the gap. When the primary electric current is less than a set threshold value, the movable iron core and the stationary iron core are separated to form the gap H; when the primary current is equal to or large than a set threshold value, the movable iron core and the stationary iron core are pulled in, the branch magnetic circuit shunts a great quantity of magnetic flow on the main magnetic circuit; and the movable iron core rotates to drive a touch part arranged on the movable iron core and is in touch fit with the a matched breaker tripping actuator. According to the supply current transformer, the purposes of saving parts and space and realizing electronic tripping and standby magnetic tripping dual protection are realized.
Description
Technical field
The present invention relates to low-voltage circuit breaker, in particular, relate to the supply current instrument transformer with reserve magnetic tripping function of electronic low pressure circuit breaker.
Background technology
As everyone knows, one of difference of electronic low pressure circuit breaker and common low-voltage circuit breaker is that electronic low pressure circuit breaker employing electronic trip unit has replaced the thermo magnetic trip release device and carried out circuit protection.Electronic trip unit adopts current transformer power supply, gathers size of current through intelligent chip and carries out the action of threading off with the transmission action command to actuator, and it has incomparable advantage than traditional thermo magnetic trip release device in many aspects.
But; Because electronic trip unit comprises the hardware system that is made up of the welding of numerous electronic devices and components, pcb board and the software systems in the intelligent chip, hardware system is formed a unified integral body with software systems, thereby; The reliability of electronic trip unit is complicated series connection model; Be the reliability that its reliability depends on numerous subsystems, add electronic trip unit on the adaptability of applied environment less than pure mechanical part, so the reliability of the dropout of electronic trip unit action is lower; In case and break down in the primary circuit and electronic trip unit can not reliably be threaded off, and then can cause serious consequence.In addition; The electronic circuit of electronic trip unit provides power supply by current transformer usually, because the operating voltage that current transformer loads is with the size of current fluctuation of primary circuit, intelligent chip starts process such as executive program all needs spended time; This just makes electronic trip unit when needs are QA; Particularly short circuit current occurs and need under the moving situation of threading off of wink at the circuit breaker major loop, might be in time, dropout rapidly, thus also can cause serious consequence.
Thereby; For moving reliability and promptness of threading off of the wink of improving electronic low pressure circuit breaker; People adopt electronic breaker to install reserve magnetic trip gear additional at present; Like this no matter be reliability reasons or promptness reason, if electronic trip unit can not be in time when short circuit current occurs, thread off rapidly, then reserve magnetic trip gear can be in time, moving dropout of wink apace.Like application number is the back-up protection tripping device that the application for a patent for invention of CN201010102304.0 discloses a kind of electronic type molded case circuit breaker; It comprises armature, support, yoke, bearing pin and reaction spring; Be characterized in that armature and yoke form independently magnetic circuit; This magnetic circuit is looped around the periphery of Primary Conductor (also being lead row or busbar etc.); Make when in Primary Conductor, producing short circuit current to produce in the magnetic circuit and powerful can order about armature and the closed magnetic field of yoke, and armature is used to touch the dropout lever of the operating mechanism of breaker of plastic casing to the closed action of yoke, causes circuit breaker tripping to trip.
Yet; Though this scheme that installs reserve magnetic trip gear additional has solved QA problem; But be not used widely, trace it to its cause mainly due to independently needing bigger space around the closed magnetic circuit of Primary Conductor, this space mainly is to be determined by the insulation distance between the size of armature that constitutes magnetic circuit and yoke, Primary Conductor and armature and the yoke; Thereby can't reduce; So cause the complex structure of back-up protection tripping device, volume too big, in electronic breaker, can't rationally be arranged in the very limited space, implement quite difficulty.
Summary of the invention
The present invention is directed to the defective of above-mentioned prior art and newly designed a kind of supply current instrument transformer with electronic low pressure circuit breaker of reserve magnetic tripping function; It need not to increase the independent magnetic circuit that is made up of armature and yoke that is exclusively used in that reserve magnetic threads off, and threads off and stablizes the function that secondary current is exported but have reserve magnetic simultaneously concurrently.
According to embodiments of the invention; A kind of supply current instrument transformer with reserve magnetic tripping function is provided; Comprise the static iron core 2 that is fixed on the shell holder 1, be sleeved on secondary coil 3 on the static iron core 2, constitute moving iron core 4 of the open loop-shaped of dividing magnetic circuit and back-moving spring 5; Described static iron core 2 constitutes the closed-loop shaped main magnetic circuit that comprises first node A, Section Point B and the 3rd node C in the periphery of Primary Conductor 7; One end and the shell holder 1 of back-moving spring 5 are fixedly connected; The moving iron core 4 of its other end and open loop-shaped connects, and coupling mechanism 6 is arranged on static iron core 2 and moves between the iron core 4 with open loop-shaped, and making open loop-shaped move iron core 4 can be around the rotating shaft 611 of the revolute pair structure 61 of coupling mechanism 6; Or 614 rotate; Receive the control of the primary current of Primary Conductor 7 can do adhesive and contact or separate and form air gap H between the moving iron core 4 of described open loop-shaped and the static iron core 2, the size of this air gap H thickness is made opposite change with the size variation of primary current, and the size of the elastic acting force of said back-moving spring 5 is made opposite change with the size variation of said air gap H thickness.When primary current during less than the threshold value of the short circuit current of setting; Separate between the moving iron core 4 of described open loop-shaped and the static iron core 2 and form air gap H; When the primary current in Primary Conductor 7 is equal to or greater than the threshold value of short circuit current of setting; Adhesive between moving iron core 4 of described open loop-shaped and the static iron core 2; Magnetic circuit was shunted the magnetic flux on the main magnetic circuit in a large number in described minute, and the rotation of the moving iron core 4 of open loop-shaped drives the touch part 43 that is arranged on it and touches with the dropout actuated piece 10 of supporting electronic low pressure circuit breaker and cooperate.
According to an embodiment; First node A on the closed-loop shaped main magnetic circuit of described static iron core 2 and Section Point B are respectively formed at the both sides of secondary coil 3; First conjunction plane 21 of static iron core 2 is formed on described first node A place, and second conjunction plane 22 of static iron core 2 is formed on described Section Point B place.Be formed with respectively at the two ends of the moving iron core 4 of described open loop-shaped with corresponding the 4th node D of first node A and with corresponding the 5th node E of Section Point B; First of the moving iron core 4 of open loop-shaped cooperates conjunction plane 41 to be formed on described the 4th node D place; Second of the moving iron core 4 of open loop-shaped cooperates conjunction plane 42 to be formed on described the 5th node E place, and first cooperation conjunction plane 41 on the moving iron core 4 of described open loop-shaped and first conjunction plane, the 21 normal contact matching on the static iron core 2.Separate being meant that second on the moving iron core 4 of open loop-shaped cooperates and separating between second conjunction plane 22 on conjunction plane 42 and the static iron core 2 and forms air gap H between the moving iron core 4 of described open loop-shaped and the static iron core 2, adhesive is meant that the second cooperation conjunction plane 42 also contacts with 22 adhesives of second conjunction plane between the moving iron core 4 of described open loop-shaped and the static iron core 2.The area of first conjunction plane 21 of described static iron core 2, the area of second conjunction plane 22 are 1 to 2 times of area of cross section of the A-C-B section closed-loop shaped main magnetic circuit of static iron core 2; The D-E section that first of the moving iron core 4 of described open loop-shaped cooperates the area, second of conjunction plane 41 to cooperate the area of conjunction plane 42 to be respectively the moving iron core 4 of open loop-shaped is divided 1 to 2 times of area of the cross section of magnetic circuit.
According to an embodiment; The elastic force of said back-moving spring 5 should meet the following conditions: when primary current during less than the threshold value of the short circuit current of setting; The elastic force of described back-moving spring 5 is greater than described electromagnetic attraction; So that separate between the moving iron core 4 of described open loop-shaped and the static iron core 2, and make the thickness of air gap H constant; And when primary current is equal to or greater than the threshold value of short circuit current of setting; The elastic force of described back-moving spring 5 is less than the main magnetic circuit of air gap H both sides and divide the electromagnetic attraction between the magnetic circuit, so that adhesive also contacts between the moving iron core 4 of described open loop-shaped and the static iron core 2.Perhaps when primary current during less than the normal value set, the elastic force of described back-moving spring 5 is greater than described electromagnetic attraction, so that separate between the moving iron core 4 of described open loop-shaped and the static iron core 2, and make the thickness of air gap H constant; When between the threshold value of the short circuit current of normal value that primary current is being set and setting, the elastic force of described back-moving spring 5 equals described electromagnetic attraction, so that the thickness of air gap H floats with force variation; And when primary current is equal to or greater than the threshold value of short circuit current of setting; The elastic force of described back-moving spring 5 is less than the main magnetic circuit of air gap H both sides and divide the electromagnetic attraction between the magnetic circuit, so that adhesive also contacts between the moving iron core 4 of described open loop-shaped and the static iron core 2.
According to an embodiment; Described coupling mechanism 6 comprise at least one be fixedly mounted on connector 62 on the static iron core 2, be used for connector 62 and the moving iron core 4 of open loop-shaped rotate the revolute pair mechanism 61 that connects, first conjunction plane 21 and first of static iron core 2 cooperates conjunction plane 41, wherein: first conjunction plane 21 is to be formed on the plane on the static iron core 2; First cooperates conjunction plane 41 to be made up of first plane 411 and second plane 412 that are formed on the moving iron core 4 of open loop-shaped; And first and second plane 411,412 is through roundlet cambered surface 413 transition and linkages; Described roundlet cambered surface 413 is tangent with first plane 411, second plane 412 respectively; The rotating shaft 611 of its center of circle and revolute pair structure 61, or 614 axle center is concentric; When primary current is under the normal condition, the elastic force of back-moving spring 5 orders about first plane 411 and first conjunction plane, 21 contact matching, and second plane 412 does not contact with first conjunction plane 21; When primary current surpasses preset threshold; The moving iron core 4 of open loop-shaped is rotated by the driving of the electromagnetic attraction between main magnetic circuit and the branch magnetic circuit and moves the rotating shaft 611 of auxiliary structure 61; Or 614 rotate; Order about second plane 412 and first conjunction plane, 21 contact matching, and first plane 411 does not contact with first conjunction plane 21.
According to another embodiment; Described coupling mechanism 6 comprise at least one be fixedly mounted on connector 62 on the static iron core 2, be used for connector 62 and the moving iron core 4 of open loop-shaped rotate the revolute pair mechanism 61 that connects, first conjunction plane 21 and first of static iron core 2 cooperates conjunction plane 41, wherein: first conjunction plane 21 is a spill arc surface that is formed on the static iron core 2; The first cooperation conjunction plane 41 is a convex shaped arc face that is formed on the moving iron core 4 of open loop-shaped; The center of circle of the center of circle of described spill arc surface and convex shaped arc face respectively with the rotating shaft 611 of revolute pair structure 61, or 614 axle center is concentric, and is slidingly matched for often contacting between spill arc surface and the convex shaped arc face.
Described revolute pair structure 61 comprises rotating shaft 611 that is formed on the connector 62 and the axis hole 612 that is formed on the moving iron core 4 of open loop-shaped, and described rotating shaft 611 is pivoted in the axis hole 612; Perhaps described revolute pair structure 61 comprises axis hole 613 that is formed on the connector 62 and the rotating shaft 614 that is fixedly connected on the moving iron core 4 of open loop-shaped, and described axis hole 613 is sleeved in the rotating shaft 614 pivotally.
According to an embodiment; Described coupling mechanism 6 comprises that also one one end connects the holddown spring 63 of the moving iron core 4 of open loop-shaped; Its other end is connected with static iron core 2 or connector 62, and the elastic force of holddown spring 63 is ordered about first and cooperated formation stable contact thrust between the conjunction plane 41 and first conjunction plane 21; And cooperate under conjunction plane 41 and first conjunction plane, 21 contact conditions first, the rotating shaft 611 of revolute pair structure 61, or 614 and axis hole 612, or leave the gap value L that the first cooperation conjunction plane 41 and first conjunction plane 21 are compressed between 613.
According to an embodiment, the area of the cross section of the A-B section between closed-loop shaped main magnetic circuit first node A and Section Point B of described static iron core 2 is less than the area of the cross section of A-C-B section main magnetic circuit; The area of the cross section of the D-E section between minute magnetic circuit the 4th node D and the 5th node E of the moving iron core 4 of described open loop-shaped is less than the area of the cross section of the A-C-B section closed-loop shaped main magnetic circuit of static iron core 2, and poor greater than the area of the cross section of the area of the cross section of the A-C-B section closed-loop shaped main magnetic circuit of static iron core 2 and A-B section main magnetic circuit.
According to an embodiment; On described shell holder 1, be provided with boss 11; Be used for when second on the moving iron core 4 of open loop-shaped cooperates conjunction plane 42 and second conjunction plane 22 on the static iron core 2 separates, the moving iron core 4 of described open loop-shaped is in stable state through the contact matching with boss 11 under the elastic force effect of back-moving spring 5.
Obviously; Because the very big independent magnetic circuit that is made up of traditional armature and yoke of volume has been saved in design of the present invention; Increase reserve magnetic tripping function so under the prerequisite that volume does not increase, realized electronic breaker; Apparatus structure advantages of simple of the present invention, advantages of small volume, the electronic breaker that is widely used in having authigenic power supply for reserve magnetic tripping function provides new departure economic, that be prone to row.
Description of drawings
Above-mentioned and other technical characterictic, characteristic and advantage of the present invention will become more obvious through the description below in conjunction with accompanying drawing and embodiment.In the accompanying drawings:
Fig. 1-2 is the theory structure sketch map of first embodiment of the supply current instrument transformer with reserve magnetic tripping function of the present invention, and the bindiny mechanism among the figure is a plane bindiny mechanism, the state that is primary current less than the normal value of setting shown in Figure 1; The state that is primary current more than or equal to preset threshold shown in Figure 2;
Fig. 3-5 is respectively the structure enlarged diagram of the plane bindiny mechanism that has holddown spring of supply current instrument transformer shown in Figure 1, the state that is primary current less than the normal value of setting shown in Figure 3; The rotating shaft of revolute pair mechanism shown in Figure 4 is fixed on the moving iron core of open loop-shaped; The rotating shaft of revolute pair mechanism shown in Figure 5 is formed on the connector;
Fig. 6-the 7th, the theory structure sketch map of second embodiment of the supply current instrument transformer with reserve magnetic tripping function of the present invention, the bindiny mechanism among the figure is a cabochon bindiny mechanism, the state that is primary current less than the normal value of setting shown in Figure 6; The state that is primary current more than or equal to preset threshold shown in Figure 7;
Fig. 8-the 10th, the structure enlarged diagram of the cabochon bindiny mechanism that has holddown spring of second embodiment of supply current instrument transformer with reserve magnetic tripping function of the present invention shown in Figure 6, the state that is primary current more than or equal to preset threshold shown in Figure 8; The rotating shaft of revolute pair mechanism shown in Figure 9 is fixed on the moving iron core of open loop-shaped; The rotating shaft of revolute pair mechanism shown in Figure 10 is formed on the connector.
Embodiment
Below in conjunction with first embodiment shown in the accompanying drawing 1 to 5 and second embodiment shown in Fig. 6-10, specify the execution mode with supply current instrument transformer of reserve magnetic tripping function of the present invention.The main distinction of first and second embodiment is: the plane coupling mechanism that the coupling mechanism of first embodiment has adopted the plane to cooperate with plane contact, and the coupling mechanism of second embodiment has adopted the cabochon coupling mechanism of arc surface and arc surface contact matching.The supply current instrument transformer generally comprises one around the closed loop iron circuit of Primary Conductor and one secondary coil on this iron core main magnetic circuit; When having electric current to flow in the Primary Conductor, the secondary current that this secondary coil induces is as the power supply of the electronic circuit that comprises electronic trip unit of electronic low pressure circuit breaker.The stable output that still can keep secondary current when in Primary Conductor, big electric current occurring in order to solve; Need in iron circuit, set up a branch magnetic circuit that has air gap; Under normal circumstances divide magnetic circuit not shunt the magnetic flux in the iron circuit because of air gap is arranged; And the part magnetic flux in the big electric current time-division magnetic circuit shunting iron circuit in Primary Conductor, occurs, thereby make the magnetic flux in the iron circuit stable to keep the stable output of secondary current.Though in the prior art that has, can change the thickness of air gap through the microdisplacement of minute magnetic circuit, this displacement is irrelevant with dropout, and it can not activate the dropout lever of the operating mechanism of low-voltage circuit breaker.Supply current instrument transformer of new generation with reserve magnetic tripping function provided by the invention; Be on the basis of the main magnetic circuit that the authigenic power supply of supply current instrument transformer is used; Increased the branch magnetic circuit of the dropout tripping operation of the operating mechanism that can activate low-voltage circuit breaker; Through this minute magnetic circuit, both can solve the problem of supply current instrument transformer shunting magnetic flux under big current conditions once, also can realize the electronics double protection functions with the dropout of reserve magnetic of threading off.
Referring to Fig. 1 or 2; Static iron core 2 with supply current instrument transformer of reserve magnetic tripping function of the present invention is fixed on the shell holder 1 and is sleeved on the periphery of Primary Conductor 7; Static iron core 2 constitutes the main magnetic circuit of the closed-loop shaped that comprises first node A, Section Point B and the 3rd node C, and the secondary coil 3 of power supply usefulness is sleeved on the closed-loop shaped main magnetic circuit of static iron core 2, and the moving iron core 4 of open loop-shaped constitutes the branch magnetic circuit; One end of back-moving spring 5 connects with shell holder 1, and the other end connects with the moving iron core 4 of open loop-shaped.Back-moving spring 5 among the figure is extension spring, also can adopt a kind of in stage clip or the torsion spring, and back-moving spring 5 becomes to connect with static iron core 2 with that end of shell holder 1 connection is also replaceable.On the moving iron core 4 of open loop-shaped, be provided with touch part 43, this touch part 43 can cooperate with dropout actuated piece 10 touchings of low-voltage circuit breaker.
Because the main magnetic circuit that static iron core 2 forms is a closed-loop shaped; The main magnetic circuit of this closed-loop shaped is around Primary Conductor 7; So the magnetic field that the primary current in the Primary Conductor 7 produces forms magnetic flux in the main magnetic circuit that static iron core 2 constitutes; This magnetic flux can make the secondary coil 3 on the main magnetic circuit that is sleeved on static iron core 2 produce induced current, also is secondary current, and the structure of above-mentioned Primary Conductor 7, static iron core 2, secondary coil 3 has constituted current transformer; And secondary current is referred to as the supply current instrument transformer usually as the current transformer of power supply, abbreviate current transformer as.Do not reach under the magnetic saturation state at static iron core 2, the size of secondary current is proportional to the size of primary current approximately; Because current transformer needs just can satisfy job requirement at primary current than hour secondary current; So its secondary current is bigger with the parameter of the ratio of primary current; Thereby when primary current is excessive; Can cause the excessive problem of secondary current, even can cause can not normal power supply, also can burn components and parts or the equipment in the circuit when serious.One of the excessive method of secondary current of stabilizing of prior art is the magnetic saturation characteristic that utilizes the static iron core magnetic circuit, can cause magnetic circuit overheated and damage but its defective is the magnetic saturation overlong time.In order to stabilize excessive secondary current; The present invention has adopted the movable minute magnetic circuit that is made up of the moving iron core 4 of open loop-shaped; This minute, magnetic circuit had two big functions: the one, stabilize excessive secondary current function; Promptly the primary current in Primary Conductor 7 is excessive but when not reaching the short circuit current threshold value of setting as yet, can regulate a part of magnetic flux on the shunting main magnetic circuit through the air gap H that forms between moving iron core 4 and the static iron core 2, and secondary coil 3 interior secondary currents are kept normally.The 2nd, the standby tripper function; Promptly excessive and when surpassing preset threshold when the primary current in the Primary Conductor 7, the main magnetic circuit of air gap H both sides with divide electromagnetic attraction between the magnetic circuit can drive the moving iron core 4 of open loop-shaped automatically to rotate and cause supporting low-voltage circuit breaker to trip.For satisfying the requirement of above-mentioned two kinds of functions; The present invention is provided with first conjunction plane 21 at the first node A place of the main magnetic circuit of the static iron core 2 of a side of secondary coil 3; Section Point B place at the main magnetic circuit of the static iron core 2 of the opposite side of secondary coil 3 is provided with second conjunction plane 22; On the 4th node D of the branch magnetic circuit at moving iron core 4 two ends of described open loop-shaped, the 5th node E, being respectively equipped with first cooperates conjunction plane 41, second to cooperate conjunction plane 42; It is that normal contact matching is installed relation that on the moving iron core 4 of open loop-shaped first cooperates between first conjunction plane 21 on conjunction plane 41 and the static iron core 2, and can do to separate or the adhesive cooperation between second conjunction plane 22 on the second cooperation conjunction plane 42 on the moving iron core 4 of open loop-shaped and the static iron core 2.Here so-called normal contact matching is meant that first on the moving iron core 4 of open loop-shaped cooperates the conjunction plane 41 and first conjunction plane 21 on the static iron core 2 to remain and contact, so that cooperate the magnetic resistance between the conjunction plane 42 very little at first conjunction plane 21 with second.
Separation recited above cooperates the two kinds of situation that specifically comprise; A kind of is that second to cooperate the thickness of the air gap H between conjunction plane 42 and second conjunction plane 22 be to stablize the constant cooperation that separates; Just second cooperate conjunction plane 42 to be in to stablize under the motionless state its with second conjunction plane 22 between separate cooperation; Be used for two sections schemes of stablizing, stabilizing secondary current; Wherein first section is primary current less than the threshold value section of the short circuit current of setting; Second section threshold value section that is equal to or greater than the short circuit current of setting for primary current; First kind separate to cooperate also can be used for three sections stablize, stabilize the secondary current scheme (wherein first section for primary current less than the normal value section of setting, second section for primary current greater than described normal value and less than threshold value section, the 3rd section threshold value section that is equal to or greater than the short circuit current of setting for primary current of the short circuit current of setting) in first section; Promptly the primary current in Primary Conductor 7 is less than the threshold value (be suitable for two sections and stablize, stabilize the secondary current scheme) of the short circuit current of setting or primary current during less than the normal value of setting (be suitable for three sections and stablize, stabilize the secondary current scheme); Electromagnetic attraction between the main magnetic circuit of air gap H both sides and the branch magnetic circuit is less than the elastic force of back-moving spring 5; Make second to cooperate the conjunction plane 42 and second conjunction plane 22 under the elastic force effect of back-moving spring 5, to separate and form the air gap H of fixed thickness, air gap H makes the branch magnetic circuit of the moving iron core 4 of open loop-shaped regulate the magnetic flux on the shunting main magnetic circuit.Here regulating shunting is meant under the situation that air gap H remains unchanged; The air gap H of fixed thickness still has the function of automatic stabilisation secondary current; Promptly when primary current is in the lower bound of normal range (NR); Air gap H makes magnetic flux on branch magnetic circuit few (not even) the shunting main magnetic circuit, to guarantee to have the output of abundant secondary current.And the height that is in normal range (NR) at primary current in limited time, and air gap H makes the branch magnetic circuit suitably shunt magnetic flux on the main magnetic circuit, and is stable with the output that guarantees secondary current.The another kind of situation that separate to cooperate be second cooperate the thickness of the air gap H between conjunction plane 42 and second conjunction plane 22 to change for floating the cooperation that separates; Only be used for three sections stablize, stabilize the secondary current scheme second section; Be specially: when primary current is between the threshold value of short circuit current of normal value and setting of setting; Electromagnetic attraction between the main magnetic circuit of described air gap H both sides and the branch magnetic circuit equals the elastic force of back-moving spring 5; So that the thickness of air gap H floats with force variation, owing to also existing, air gap H still is in released state between the second cooperation conjunction plane 42 and second conjunction plane 22.Second kind of situation is different with first kind of situation be second cooperate conjunction plane 42 the position change with the variation of electromagnetic attraction; The elastic force of electromagnetic attraction and back-moving spring 5 is balance all the time; But when electromagnetic attraction increased, the less thick of air gap H was so that divide the magnetic flux of magnetic circuit shunting many; Divide the magnetic flux density of magnetic circuit with raising, thereby stablize the output of secondary current and stabilize excessive secondary current.And under released state,, just can make the branch magnetic circuit produce the performance of desirable adjusting shunting magnetic flux through setting the thickness of suitable air gap H.The operation principle that adhesive of the present invention cooperates is: when the primary current in the Primary Conductor 7 is equal to or greater than the threshold value of short circuit current of setting; Electromagnetic attraction between the main magnetic circuit that magnetic flux in the main magnetic circuit of static iron core 2 increases to air gap H both sides and the branch magnetic circuit is greater than the elastic force of back-moving spring 5; Electromagnetic attraction orders about the moving iron core 4 of open loop-shaped around the shaft 611; Or 614 rotate to static iron core 2; Cause second to cooperate conjunction plane 42 contact with 22 adhesives of second conjunction plane, air gap H disappears, and the branch magnetic circuit that open loop-shaped is moved iron core 4 is shunted magnetic flux on the main magnetic circuit in a large number to stabilize the interior abnormal induced current of secondary coil 3.Owing on the moving iron core 4 of described open loop-shaped, be provided with the touch part 43 that can cooperate with the dropout actuated piece touching of low-voltage circuit breaker; So certain when adhesive cooperates and shortly before the adhesive in a flash, the rotating band movable contact moving part 43 of the moving iron core 4 of open loop-shaped is touched dropout actuated pieces 10 and is caused low-voltage circuit breaker tripping operation disjunction.This shows; Above-mentioned adhesive cooperates not only to have stabilizes improper secondary current function; But also has the magnetic tripping function when short trouble occurs; Thereby realized that a cover magnetic circuit is used for power supply and reserve magnetic is threaded off, saved the reserve magnetic trip gear that increases the heavy parts such as independent magnetic circuit that constitute by armature and yoke in the prior art.
In addition, the present invention can also when being implemented in primary current greater than the normal value of setting and less than described threshold value, utilize the variation of the thickness of described air gap H to come to stabilize automatically excessive secondary current through the elastic characteristic parameter of rational Match back-moving spring 5.Obviously; Elastic force when the elastic force of back-moving spring 5 when air gap H is maximum is zero less than air gap H; And the elastic force size is the function of the variable quantity (being deflection) of air gap H thickness, and this function is exactly so-called elastic characteristic, and the elastic characteristic parameter; Be meant the structural parameters of the spring relevant, like the diameter of spring, the number of turns, spring filament diameter etc. with elastic characteristic.Elastic force can be set according to the requirement of electromagnetic attraction; Distortion can be set with the requirement of the touch position of dropout actuated piece 10 according to structure, the touch part 43 of air gap H; After elastic force and distortion are set, use the elastic characteristic parameter that existing spring method for designing just can match concrete back-moving spring 5.The concrete operation principle of above-mentioned rational Match is: at primary current during less than the normal value set, the electromagnetic attraction between the main magnetic circuit of air gap H both sides and the branch magnetic circuit makes the thickness of air gap H stablize constant less than the elastic force of back-moving spring 5.At primary current during greater than the normal value of setting and less than described threshold value, electromagnetic attraction is greater than the elastic force of back-moving spring 5, the thickness of air gap H floated change, and makes main magnetic circuit and divides the magnetic circuit adhesive but electromagnetic attraction is not enough to overcome the elastic force of back-moving spring 5.At primary current during greater than described threshold value; Electromagnetic attraction is enough to overcome the elastic force of back-moving spring 5 and orders about main magnetic circuit and divide the magnetic circuit adhesive, and open loop-shaped is moved the rotating band movable contact moving part 43 touching dropout actuated pieces 10 of iron core 4 and caused low-voltage circuit breaker tripping operation disjunction in main magnetic circuit and the adhesive of branch magnetic circuit.This shows; Increase if desired and above-mentioned be in the effect of stablizing, stabilize secondary current of the normal value of setting to the threshold value section at primary current; Also need further to match the elastic characteristic parameter of back-moving spring 5 according to each section in three sections; Specifically: be less than or equal to first section of normal value of setting at primary current, the electromagnetic attraction of the elastic force of back-moving spring 5 during greater than normal value, air gap H is maximum; And at primary current greater than described normal value and less than second section of the threshold value of the short circuit current of setting, the electromagnetic attraction of the elastic force of back-moving spring 5 during and the electromagnetic attraction during greater than described threshold value less than normal value; And at primary current the 3rd section greater than the threshold value of the short circuit current of setting, the electromagnetic attraction of the elastic force of back-moving spring 5 during less than described threshold value, air gap H is zero.
The present invention is from improving main magnetic circuit and dividing coordination reliable fit, magnetic flux between the magnetic circuit to distribute rationally and reduce aspect such as magnetic resistance heating; Need also to consider the area of rational Match main magnetic circuit and the cross section that divides magnetic circuit; Promptly perpendicular to the area in the cross section of the branch magnetic circuit on the moving iron core 4 of the main magnetic circuit on the static iron core 2 of magnetic flux flows direction and open loop-shaped; Main matching scheme comprises: static iron core 2 from first node A to Section Point B path be A-B section main magnetic circuit cross section area less than from first node A through the 3rd node C to Section Point B path be the area of the cross section of A-C-B section main magnetic circuit, to strengthen when the big electric current the magnetic flux in the main magnetic circuit to minute effect of magnetic circuit guiding.The moving iron core 4 of open loop-shaped be poor greater than the area of the cross section of the area of the cross section of the A-C-B section main magnetic circuit of static iron core 2 and A-B section main magnetic circuit of the area of the D-E section cross section that divides magnetic circuit from the 4th node D to the five node E paths; And less than the area of the cross section of the A-C-B section main magnetic circuit of static iron core 2, to strengthen the effect that A-B section main magnetic circuit, A-C-B section main magnetic circuit and D-E section divide the magnetic flux density in the magnetic circuit to divide balancing when the big electric current.Referring to Fig. 1,2,6, shown in 7, the small arrow of respectively organizing among the figure is represented magnetic flux, the quantitaes magnetic flux density of every group of small arrow.The area of first conjunction plane 21 of static iron core 2, the area of second conjunction plane 22 are 1 to 2 times of area of cross section of the A-C-B section main magnetic circuit of static iron core 2; The D-E section that first of the moving iron core 4 of open loop-shaped cooperates the area, second of conjunction plane 41 to cooperate the area of conjunction plane 42 to be respectively the moving iron core 4 of open loop-shaped is divided 1 to 2 times of area of the cross section of magnetic circuit, and its purpose is to avoid magnetic resistance to concentrate on the contact-making surface between main magnetic circuit and the branch magnetic circuit.
Referring to Fig. 3-5, current transformer of the present invention also comprises the coupling mechanism 6 that is arranged between the moving iron core 4 of static iron core 2 and open loop-shaped, and it can rotate the moving iron core 4 of open loop-shaped around the rotating shaft 611,614 of the revolute pair structure 61 of coupling mechanism 6.In the second cooperation conjunction plane 42 and second conjunction plane, 22 adhesives on the static iron core 2 on the moving iron core 4 of open loop-shaped; Be included in the adhesive engagement process at adhesive eve certain in a flash; The rotation of the moving iron core 4 of open loop-shaped drives the touch part 43 touching dropout actuated pieces 10 that are arranged on it, causes low-voltage circuit breaker to carry out disjunction tripping operation action.Since described first conjunction plane 21 and the magnetic resistance of second cooperation between the conjunction plane 42 with they between to contact thrust relevant; Under no external force effect; Described contact thrust cooperates the electromagnetic attraction between the conjunction plane 42 relevant with first conjunction plane 21, second; And electromagnetic attraction is relevant with the factors such as size of primary current, can adopt the method for elastic compression to make described magnetic resistance relatively stable for this reason.Specific embodiments is: coupling mechanism 6 also comprises a holddown spring 63; One end of holddown spring 63 is connected with the moving iron core 4 of open loop-shaped; Its other end is connected with static iron core 2 or connector 62, and the elastic force of holddown spring 63 is ordered about first and cooperated formation stable contact thrust between the conjunction plane 41 and first conjunction plane 21.And cooperate under conjunction plane 41 and first conjunction plane, 21 state of contact first, the rotating shaft 611 of revolute pair structure 61, or 614 with axis hole 613 between leave can make first cooperate the conjunction plane 41 and first conjunction plane 21 to compress gap value L.Obviously, because the elastic force effect of holddown spring 63, institute is so that the air-gap between the first cooperation conjunction plane 41 and first conjunction plane 21 is minimum, magnetic resistance is minimum and tend towards stability.Above-mentioned elastic compression scheme is applicable to first embodiment and second embodiment, if can save described elastic compression scheme need not stablize described magnetic resistance the time.Because supply current instrument transformer of the present invention has power supply and two kinds of functions of reserve magnetic dropout concurrently; So for having relatively high expectations of the rotation action of the moving iron core 4 of open loop-shaped; Comprise that mainly three aspects require: still rotation process no matter the moving iron core 4 of open loop-shaped remains static; The first cooperation conjunction plane 41 on the moving iron core 4 of open loop-shaped will remain good the contact with first conjunction plane 21 on the static iron core 2, and promptly normal contact and contact magnetic resistance are very little; The rotation precision of the moving iron core 4 of open loop-shaped wants high, with the shape of guaranteeing air gap H simultaneously, dimensional accuracy (satisfying the required precision of stablize secondary current) and with the shake-up quality of fit (satisfying the reliability requirement of reserve magnetic dropout) of dropout actuated piece 10; The rotation of the moving iron core 4 of open loop-shaped is wanted flexibly, particularly as three sections of the employings of second embodiment are stablized, when stabilizing secondary current, must guarantee air gap H thickness variation flexibly.Coupling mechanism 6 of the present invention is the keys that satisfy above-mentioned specification requirement, and two kinds of embodiments of coupling mechanism 6 are described respectively below in conjunction with accompanying drawing 1-5 and accompanying drawing 6-10.
First kind of scheme of the coupling mechanism of the present invention 6 shown in Fig. 1 to 5 is the plane coupling mechanism; It is applicable to that two sections (promptly first section for primary current less than the threshold value section of the short circuit current of setting, the threshold value section of second section short circuit current that is equal to or greater than setting for primary current) stablize, stabilize the scheme of secondary current; Be characterized in that air gap H only has or unparalled kind of state, i.e. the rotation of coupling mechanism 6 just makes air gap H change each other having between state (being that second of the moving iron core 4 of open loop-shaped cooperates released state between second conjunction plane 22 of conjunction plane 42 and static iron core 2) and the stateless (being attracting state between first conjunction plane 21 of open loop-shaped first plane 411 and the static iron core 2 that move iron core 4).
Referring to Fig. 1 to 5; Coupling mechanism 6 comprises that one is fixedly mounted on connector 62 on the static iron core 2, is used for that connector 62 and the moving iron core 4 of open loop-shaped are rotated the revolute pair mechanism 61, first conjunction plane 21 and first that connect and cooperates conjunction plane 41; First cooperates conjunction plane 41 to be made up of first plane 411 and second plane 412 that are formed on the moving iron core 4 of open loop-shaped; First plane 411 and second plane 412 are through roundlet cambered surface 413 transition and linkages; Roundlet cambered surface 413 is tangent with first plane 411, second plane 412 respectively, and the axle center of the rotating shaft 611 of the center of circle of roundlet cambered surface 413 and revolute pair structure 61 (see Fig. 3, or 614 among Fig. 4) is concentric.The operation principle of this plane coupling mechanism is: under primary current was in normal condition, the elastic force of back-moving spring 5 ordered about first plane 411 and does not contact with first conjunction plane 21 with first conjunction plane, 21 contact matching, second plane 412; When the primary current in the Primary Conductor 4 surpasses preset threshold; At the main magnetic circuit of air gap H both sides and divide under the driving of the electromagnetic attraction between the magnetic circuit; Rotating shaft 611 or 614 rotations that the moving iron core 4 of open loop-shaped rotates and moves auxiliary structure 61; Order about second plane 412 and first conjunction plane, 21 contact matching, and first plane 411 does not contact with first conjunction plane 21.Because first cooperates conjunction plane 41 to comprise first plane 411, roundlet cambered surface 413 and second plane 412; Formed first cooperate 41 fens three phases of conjunction plane and first conjunction plane, 21 contact matching form, that is: the phase I is first plane 411 and first conjunction plane, 21 contact matching; Second stage is roundlet cambered surface 413 and first conjunction plane, 21 contact matching; Phase III is second plane 412 and first conjunction plane, 21 contact matching; And the contact area between the roundlet cambered surface 413 of second stage and first conjunction plane 21 is much littler than phase I or phase III; Just the contact magnetic resistance of second stage is more much bigger than phase I or phase III; So the roundlet cambered surface 413 of second stage as the transition between first plane 411 of phase I and the 3rd section second plane 412, is to influence two sections effects of stablizing, stabilizing secondary current.If the roundlet cambered surface 413 of second stage is used as three sections schemes of stablizing, stabilizing secondary current; Need realize that air gap H changes floating of thickness with the roundlet cambered surface 413 and first conjunction plane, 21 contact matching of second stage, contact the big problem of magnetic resistance this moment then may influence the effect of stablizing secondary current.
Second kind of scheme of the coupling mechanism of the present invention 6 shown in Fig. 6 to 10 is the cabochon coupling mechanism; It is not only applicable to two sections above-mentioned schemes of stablizing, stabilizing secondary current; But also be applicable to three sections schemes of stablizing, stabilizing secondary current, promptly first section normal value section, second section that is less than or equal to setting for primary current for primary current greater than described normal value and less than threshold value section, the 3rd section threshold value section that is equal to or greater than the short circuit current of setting for primary current of the short circuit current of setting.The boss 11 of location is arranged on the instrument transformer shell holder 1; Under second on the moving iron core 4 of open loop-shaped cooperates conjunction plane 42 and state that second conjunction plane 22 on the static iron core 2 separates; The moving iron core 4 of open loop-shaped under the elastic force effect of back-moving spring 5 with boss 11 contact matching, make open loop-shaped move iron core 4 and be in stable state.Obviously, the function of boss 11 is to make the moving iron core 4 of open loop-shaped with static iron core 2 released states the time, to have stable location, makes air gap H have stable thickness.The characteristics of second kind of scheme of coupling mechanism 6 are that air gap H not only has or unparalled kind of state; The rotation of coupling mechanism 6 not only can make air gap H be in has state (being that second of the moving iron core 4 of open loop-shaped cooperates released state between second conjunction plane 22 of conjunction plane 42 and static iron core 2) or stateless (being that open loop-shaped is moved attracting state between second conjunction plane 22 that second of iron core 4 cooperates conjunction plane 42 and static iron core 2); But also can make air gap H between the being and not being two states, change thickness, promptly air gap H cooperates the change in location of conjunction plane 42 between second conjunction plane 22 of boss 11 and static iron core 2 to float with second of the moving iron core 4 of open loop-shaped.
Referring to Fig. 6 to 10; Coupling mechanism 6 of the present invention comprise one be fixedly mounted on connector 62 on the static iron core 2, be used for connector 62 and the moving iron core 4 of open loop-shaped rotate the revolute pair mechanism 61 that connects, first conjunction plane 21 that constitutes by a spill arc surface that is formed on the static iron core 2 and first cooperate conjunction plane 41 by what a convex shaped arc face that is formed on the moving iron core 4 of open loop-shaped constituted; The center of circle of the center of circle of spill arc surface and convex shaped arc face respectively with rotating shaft 611; Or 614 axle center is concentric, is slidingly matched for often contacting between spill arc surface and the convex shaped arc face.Because cooperating between the conjunction plane 41, first conjunction plane 21 and first adopted the structure that the spill arc surface matches with the convex shaped arc face; So no matter which angle the moving iron core 4 of open loop-shaped turns to; Contact area between spill arc surface and the convex shaped arc face is constant; Be the spill arc surface with the convex shaped arc face between to contact magnetic resistance constant, so it can not only finely be applicable to two sections schemes of stablizing, stabilizing secondary current, and can also finely be applicable to three sections schemes of stablizing, stabilizing secondary current.
No matter be first embodiment or second embodiment, the connector 62 of coupling mechanism 6 can be one or two.When adopting two connectors 62, two connectors 62 are facing to being provided with.The structure that connector 62 and static iron core 2 is fixedly connected can adopt riveted joint, screw to be connected, pin connects, bonding etc.Described revolute pair structure 61 comprises two kinds of schemes: first kind of scheme is like Fig. 5, shown in 10; Revolute pair structure 61 comprises rotating shaft 611 that is formed on the connector 62 and the axis hole 612 that is formed on the moving iron core 4 of open loop-shaped; Rotating shaft 611 is pivoted in the axis hole 612, and described gap value L is in the top of rotating shaft 611.First kind of scheme is like Fig. 4, shown in 9; Revolute pair structure 61 comprises axis hole 613 that is formed on the connector 62 and the rotating shaft 614 that is fixedly connected on the moving iron core 4 of open loop-shaped; Axis hole 613 is sleeved in the rotating shaft 614 pivotally, and described gap value L is in the below of rotating shaft 614.
Though the concrete mounting structure of not shown dropout actuated piece 10 among Fig. 1 to 10; But it is not hard to imagine; Dropout actuated piece 10 can be installed on the shell holder 1 and have the thread off part of relation of interlock with the tripping mechanism of low press breaker; Promptly thread off actuated piece 10 for being installed in the driving member in the low-voltage circuit breaker; After touch part 43 on the moving iron core 4 of open loop-shaped touches dropout actuated piece 10,, cause the dropout tripping operation of low press breaker again by the dropout lever (not shown) in the tripping mechanism of the low press breaker of dropout actuated piece 10 touchings.Dropout actuated piece 10 also can be installed in the supply current instrument transformer and have the thread off part of relation of interlock with the tripping mechanism of low press breaker, can also be the dropout lever of the tripping mechanism of low-voltage circuit breaker.Selecting for use of above-mentioned three kinds of schemes can be decided according to the concrete mounting structure between supply current instrument transformer and the low-voltage circuit breaker.
Claims (10)
1. supply current instrument transformer with reserve magnetic tripping function; Comprise the static iron core (2) that is fixed on the shell holder (1), be sleeved on secondary coil (3) on the static iron core (2), constitute moving iron core (4) of the open loop-shaped of dividing magnetic circuit and back-moving spring (5); Described static iron core (2) constitutes the closed-loop shaped main magnetic circuit that comprises first node A, Section Point B and the 3rd node C in the periphery of Primary Conductor (7), it is characterized in that:
Described back-moving spring (5) is connected between shell holder (1) and the moving iron core (4) of open loop-shaped; Coupling mechanism (6) is arranged between static iron core (2) and the moving iron core (4) of open loop-shaped; Making open loop-shaped move iron core (4) can be around the rotating shaft (611 of the revolute pair structure (61) of coupling mechanism (6); Or 614) rotate; Described open loop-shaped is moved the control that receives the primary current of Primary Conductor (7) between iron core (4) and the static iron core (2) and can be done adhesive and contact or separate and form air gap H, and the size of this air gap H thickness is made opposite change with the size variation of primary current, and the size of the elastic acting force of said back-moving spring (5) is made opposite change with the size variation of said air gap H thickness;
When primary current during less than the threshold value of the short circuit current of setting; Described open loop-shaped is moved and is separated between iron core (4) and the static iron core (2) and form air gap H; When the primary current in Primary Conductor (7) is equal to or greater than the threshold value of short circuit current of setting; Described open loop-shaped is moved adhesive between iron core (4) and the static iron core (2); Magnetic circuit was shunted the magnetic flux on the main magnetic circuit in a large number in described minute, and the rotation of the moving iron core (4) of open loop-shaped drives the touch part (43) that is arranged on it and touches with the dropout actuated piece (10) of supporting electronic low pressure circuit breaker and cooperate.
2. supply current instrument transformer according to claim 1 is characterized in that:
First node A on the closed-loop shaped main magnetic circuit of described static iron core (2) and Section Point B are respectively formed at the both sides of secondary coil (3); First conjunction plane (21) of static iron core (2) is formed on described first node A place, and second conjunction plane (22) of static iron core (2) is formed on described Section Point B place;
Be formed with respectively at the two ends of the moving iron core (4) of described open loop-shaped with corresponding the 4th node D of first node A and with corresponding the 5th node E of Section Point B; Open loop-shaped is moved first of iron core (4) and is cooperated conjunction plane (41) to be formed on described the 4th node D place; Open loop-shaped is moved second of iron core (4) and is cooperated conjunction plane (42) to be formed on described the 5th node E place, and first on the moving iron core (4) of described open loop-shaped cooperates conjunction plane (41) and the normal contact matching of first conjunction plane (21) on the static iron core (2);
Described open loop-shaped is moved to separate between iron core (4) and the static iron core (2) and is meant that open loop-shaped moves second on the iron core (4) and cooperate and separates between second conjunction plane (22) on conjunction plane (42) and the static iron core (2) and form air gap H, and described open loop-shaped moves that adhesive is meant that the second cooperation conjunction plane (42) also contacts with second conjunction plane (22) adhesive between iron core (4) and the static iron core (2).
3. supply current instrument transformer according to claim 1 is characterized in that, the elastic force of said back-moving spring (5) should meet the following conditions:
When primary current during less than the threshold value of the short circuit current of setting, the elastic force of described back-moving spring (5) is greater than described electromagnetic attraction, so that separate between the moving iron core (4) of described open loop-shaped and the static iron core (2), and make the thickness of air gap H constant; And when primary current is equal to or greater than the threshold value of short circuit current of setting; The elastic force of described back-moving spring (5) is less than the main magnetic circuit of air gap H both sides and divide the electromagnetic attraction between the magnetic circuit, so that adhesive also contacts between the moving iron core (4) of described open loop-shaped and the static iron core (2); Perhaps
When primary current during less than the normal value set, the elastic force of described back-moving spring (5) is greater than described electromagnetic attraction, so that separate between the moving iron core (4) of described open loop-shaped and the static iron core (2), and make the thickness of air gap H constant; When between the threshold value of the short circuit current of normal value that primary current is being set and setting, the elastic force of described back-moving spring (5) equals described electromagnetic attraction, so that the thickness of air gap H floats with force variation; And when primary current is equal to or greater than the threshold value of short circuit current of setting; The elastic force of described back-moving spring (5) is less than the main magnetic circuit of air gap H both sides and divide the electromagnetic attraction between the magnetic circuit, so that adhesive also contacts between the moving iron core (4) of described open loop-shaped and the static iron core (2).
4. supply current instrument transformer according to claim 1 and 2; It is characterized in that; Described coupling mechanism (6) comprise at least one be fixedly mounted on connector (62) on the static iron core (2), be used for connector (62) and the moving iron core (4) of open loop-shaped rotate the revolute pair mechanism (61) that connects, first conjunction plane (21) and first of static iron core (2) cooperates conjunction plane (41), wherein:
First conjunction plane (21) is for being formed on the plane on the static iron core (2);
First cooperates conjunction plane (41) to be made up of first plane (411) and second plane (412) that are formed on the moving iron core (4) of open loop-shaped; And first and second plane (411,412) are through little arc surface (413) transition and linkage; Described little arc surface (413) is tangent with first plane (411), second plane (412) respectively; The axle center of the rotating shaft of its center of circle and revolute pair structure (61) (611, or 614) is concentric;
When primary current is under the normal condition, the elastic force of back-moving spring (5) orders about first plane (411) and first conjunction plane (21) contact matching, and second plane (412) do not contact with first conjunction plane (21);
When primary current surpasses preset threshold; Open loop-shaped is moved the rotating shaft (611 that iron core (4) receives main magnetic circuit and divides the driving of the electromagnetic attraction between the magnetic circuit to rotate moving auxiliary structure (61); Or 614) rotate; Order about second plane (412) and first conjunction plane (21) contact matching, and first plane (411) do not contact with first conjunction plane (21).
5. supply current instrument transformer according to claim 1 and 2; It is characterized in that; Described coupling mechanism (6) comprise at least one be fixedly mounted on connector (62) on the static iron core (2), be used for connector (62) and the moving iron core (4) of open loop-shaped rotate the revolute pair mechanism (61) that connects, first conjunction plane (21) and first of static iron core (2) cooperates conjunction plane (41), wherein:
First conjunction plane (21) is a spill arc surface that is formed on the static iron core (2);
The first cooperation conjunction plane (41) is a convex shaped arc face that is formed on the moving iron core (4) of open loop-shaped;
The center of circle of the center of circle of described spill arc surface and convex shaped arc face is concentric with the axle center of the rotating shaft of revolute pair structure (61) (611, or 614) respectively, and is slidingly matched for often contacting between spill arc surface and the convex shaped arc face.
6. according to the described supply current instrument transformer in one of claim 4 or 5, it is characterized in that:
Described revolute pair structure (61) comprises the rotating shaft (611) that is formed on the connector (62) and is formed on the axis hole (612) on the moving iron core (4) of open loop-shaped, and described rotating shaft (611) is pivoted in the axis hole (612); Perhaps
Described revolute pair structure (61) comprises the axis hole (613) that is formed on the connector (62) and is fixedly connected moves the rotating shaft (614) on the iron core (4) in open loop-shaped, and described axis hole (613) is sleeved in the rotating shaft (614) pivotally.
7. supply current instrument transformer according to claim 1 is characterized in that:
The area of the cross section of the A-B section between closed-loop shaped main magnetic circuit first node A and Section Point B of described static iron core (2) is less than the area of the cross section of A-C-B section main magnetic circuit;
Described open loop-shaped is moved the area of cross section of the D-E section between minute magnetic circuit the 4th node D and the 5th node E of iron core (4) less than the area of the cross section of the A-C-B section closed-loop shaped main magnetic circuit of static iron core (2), and poor greater than the area of the cross section of the area of the cross section of the A-C-B section closed-loop shaped main magnetic circuit of static iron core (2) and A-B section main magnetic circuit.
8. supply current instrument transformer according to claim 2 is characterized in that:
The area of first conjunction plane (21) of described static iron core (2), the area of second conjunction plane (22) are 1 to 2 times of area of cross section of the A-C-B section closed-loop shaped main magnetic circuit of static iron core (2);
Described open loop-shaped is moved 1 to 2 times of area that D-E section that area, second that first of iron core (4) cooperates conjunction plane (41) cooperates the area of conjunction plane (42) to be respectively the moving iron core (4) of open loop-shaped is divided the cross section of magnetic circuit.
9. supply current instrument transformer according to claim 2; It is characterized in that: on described shell holder (1), be provided with boss (11); Be used for cooperating second conjunction plane (22) on conjunction plane (42) and the static iron core (2) when separating when second on the moving iron core (4) of open loop-shaped, described open loop-shaped is moved iron core (4) and under the elastic force effect of back-moving spring (5), is in stable state through the contact matching with boss (11).
10. supply current instrument transformer according to claim 6 is characterized in that:
Described coupling mechanism (6) comprises that also one one end connects the holddown spring (63) of the moving iron core (4) of open loop-shaped; Its other end is connected with static iron core (2) or connector (62), and the elastic force of holddown spring (63) is ordered about first and cooperated formation stable contact thrust between conjunction plane (41) and first conjunction plane (21); And
Cooperate under conjunction plane (41) and first conjunction plane (21) contact condition first, leave between the rotating shaft of revolute pair structure (61) (611, or 614) and the axis hole (612, or 613) can make first cooperate conjunction plane (41) and first conjunction plane (21) to compress gap value L.
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| CN201110374558.2A CN102420048B (en) | 2011-11-21 | 2011-11-21 | Supply current transformer with standby magnetic tripping function |
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| CN201110374558.2A CN102420048B (en) | 2011-11-21 | 2011-11-21 | Supply current transformer with standby magnetic tripping function |
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| CN102420048B CN102420048B (en) | 2014-01-15 |
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| CN113628843A (en) * | 2021-08-12 | 2021-11-09 | 德清盖格电子有限公司 | Precise current transformer |
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| Publication number | Publication date |
|---|---|
| CN102420048B (en) | 2014-01-15 |
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Application publication date: 20120418 Assignee: ZHEJIANG CHINT ELECTRICS Co.,Ltd. Assignor: SHANGHAI NOARK ELECTRIC Co.,Ltd. Contract record no.: X2021330000593 Denomination of invention: Power supply current transformer with backup magnetic tripping function Granted publication date: 20140115 License type: Common License Record date: 20211025 |
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