CN201426033Y - Self-recovery current limiting circuit break device by utilizing conductive fluid and magnetic fluid - Google Patents

Abstract

The utility model discloses a self-recovery current limiting circuit break device by utilizing conductive fluid and magnetic fluid, belonging to electric and automatic control field. The self-recoverycurrent limiting circuit break device consists of a main body and an auxiliary body, and an encapsulating shell of the main body and an external solid electrode terminal form a sealed hollow cavity in which conductive fluid and magnetic fluid are arranged at different layers. When the hollow cavities are multiple in number, clapboards are arranged in the hollow cavities, internal solid electrodeterminals are arranged on the clapboards, the clapboards equally divide the hollow cavities, and conductive fluid and magnetic fluid are arranged in different layers in each hollow cavity. The auxiliary body comprises a magnetic field generating device and a temperature adjusting device. The main body and the auxiliary body of the self-recovery current limiting circuit break device are connected to a controlled circuit, and when the controlled circuit has fault current, the magnetic filed generating device generates gradient magnetic field big enough to quickly separate the conductive fluid from the solid electrode terminal. In this way, the circuit can be disconnected quickly. With the response time reaching millisecond, the self-recovery current limiting circuit break device can effectively protect the safety of electric equipment and can solve the problems of burning down and difficult disjunction of a contact terminal. The current limiting circuit break device has self recovery function.

Description

A kind of self-recovery current limiting tripper that utilizes conductor fluid and magnetic fluid

Technical field

The utility model belongs to electric and automation field, relates to the foundation works and the remote auto control technology of electric switch equipment, is specifically related to the current limliting and the tripper of high pressure, middle pressure or low voltage switchgear.

Background technology

In recent years along with the developing rapidly of industry such as China's oil chemical industry, mine, metallurgy, machinery, weaving, the electric energy of consumption is more and more and concentrate.Increase year by year along with the electric power system capacity; grid short circuit capacity and short circuit current level are also in continuous growth; as elements such as the switch of the circuit protection device of more and more widely being used in electronics and electric each field, fuses; requirement to its breaking capacity and reliability service improves constantly, and this has become a major issue of restriction operation of power networks and development at present.Therefore develop effective overload or short circuit current limitation and tripper,, thereby improve the operational reliability of electric power system, become the pressing issues of present China safe operation of power system and power construction, development with the overload or the capacity of short circuit of restriction electric power system.And, day by day serious and nuclear industry develops rapidly along with environmental pollution, common open circuit and the application of current-limiting apparatus in some specific environments is restricted, wish to have a kind of can Long-distance Control, efficient, control device that the energy is clean, be used for controlling that some is dangerous high or be not suitable for the circuit in field such as artificial direct control.To opening circuit of using of this occasion with current-limiting apparatus will possess following characteristics: non-contact control, long-term work continuously, and have automatic controlled function, can carry out Long-distance Control, to adapt to the needs of modern production and scheduling.

Circuit breaker is cutting off and is connecting load circuit, and the disengagement failure circuit, and more and more important effect is being brought into play in assurance equipment safety operation aspect.Used on the market circuit breaker mainly contains thermal circuit beraker, magnetic circuit breaker, reclosing type circuit breaker and earth leakage circuit breaker etc. at present.Thermal circuit beraker adopts a bimetal leaf of connecting with circuit.The heat that electric current produces between overcharge period can make bi-metal plate deformed.Thereby make circuit breaker trip.Compare with fuse.Thermal protector has a significant advantage.Can reset again after tripping operation exactly, they can also be as power connection, the stopcock of protected equipment.Yet this type of circuit breaker is subjected to influence of temperature change bigger, and service behaviour is stable inadequately.Magnetic circuit breaker provides precision and the higher solution of reliability for most of design problems.It mainly is the combination of electromagnetic contactor and over power relay, is made up of motor switch and magnetic coil, and the effect of magnetic coil is to handle engaging-piece and motor switch work with electromagnetic force.The induction by current solenoid of magnetic circuit breaker is subjected to the influence of variation of ambient temperature little. so magnetic circuit breaker has temperature stability. can as thermal circuit beraker, not be subjected to the influence of variation of ambient temperature significantly.Composite type circuit breaker has thermal circuit beraker and two kinds of 26S Proteasome Structure and Functions of magnetic circuit breaker simultaneously, can be to circuit breaker because the fault that overheated, overload or short circuit cause effectively protect, and the loading range of its adaptation is wider.The working method of earth leakage circuit breaker is identical with magnetic circuit breaker, if behind the earth leakage circuit breaker, power supply outflow and the current value that returns differ and have surpassed the set point of sewing sensitivity, and then circuit breaker will trip, and there is suggestion device to send fault warning, thereby possessed intelligentized characteristics.

Yet, above-mentioned present widely used circuit breaker mainly is made of mechanical moving element and contact, this mechanical switch that depends on the solid phase contact, wearing and tearing easily, at the solid phase contact surface erosion or melting welding phenomenon take place easily, thereby cause the short circuit of switch or relay, so this class switch disconnector is not long useful life, response speed is slow, and functional reliability is not high.A host of facts prove, because the basic reason that wire short-circuiting causes the electrical fire accident to take place frequently is that circuit breaker does not trip.The main cause of circuit breaker tripping is that be scorched to death bonding or tripping mechanism of contact is stuck, the potential safety hazard that this exists electric power system to be difficult to be avoided.

Fuse is a kind of electrical equipment of simply and effectively protecting, and is widely used in the various electronic electric equipments.It mainly is made up of the insulated tube (insulating base) of melt and installation melt.During use, melt is serially connected with in the protected circuit, when circuit breaks down or be unusual; being accompanied by electric current constantly raises; fuse will be when current anomaly be elevated to certain height, self fuses and cuts off electric current, thereby play the effect of protective circuit safe operation.Its structural principle really and uncomplicated, but to design and produce function admirable, can the non-easy thing of continuous reusable fuse.The conducting of tradition fuse is stable, carrying load ability is strong, but slow, the easy arcing of response speed, stability and poor controllability, and melt ageing is serious; Solid-state current limiting switch response speed is fast, no electric arc, but on-state loss is big, withstand voltage level is low, can not cut-off circuit fully and brought serious harmonic pollution to electrical network.Common fuse switch, current-limiting fuse, revolve arc formula fuse, thermal cut-off, hybrid fuse etc. reduce the fuse temperature rise, to improve aspect such as fuse arc quenching effect still perfect inadequately.And traditional fuse only can protect once, just blown to change, and not reproducible use has increased the maintenance cost of equipment, has incured loss through delay normally carrying out of productive life.Other current limiting technique as series connection current-limiting reactor, solid-state short circuit current limitation, superconductive failure current limiter, PTC resistance current limliting etc. because of there being too much power consumption, intrinsic and supplementary load loss are big, problems such as recovery time is long cause these current-limiting apparatus also to be restricted on using.

In the document, the initial report of liquid metal self-mending fuse laboratory sample starts from the seventies in 20th century abroad.The melt of this class fuse is a liquid metal, and under the fault current effect, the liquid metal evaporation disconnects the electric power system device of being protected simultaneously.Through the very short time, the metallic vapour cooling is condensed, and the circuit at melt place recovers.This self-mending fuse can repeat repeatedly to use, and its major defect is the protective feature instability, and this is because after repeatedly moving, due to dielectric lining ring channel dimensions changes.In addition, it is difficult that it has steep decline protective feature and other protective device to cooperate, and also do not make protective device with it separately at present.The part of Chang Zuowei device for switching for example with the circuit breaker combination, improves breaking capacity with this in the world.Yet the repeatedly action of fuse makes the analyte of dielectric lining ring pollute liquid metal, thereby causes the prolongation of arcing time even not extinguished.

What occur the nineties in 20th century a kind of novelly is made up of polymer resin matrix and the conducting particles that mixes wherein from recovering fuse.Under the normal condition, show as Low ESR, the heat that the electric current of line flows this moment on it produces is very little, can not change the crystal structure of polymer resin, thereby makes circuit keep path.When having overcurrent to take place in the circuit; the heat that the big electric current on it of flowing through produces causes that temperature raises in the resin matrix, the polymer resin matrix volumetric expansion, and its impedance raises rapidly; thereby reduced the electric current in the circuit effectively, played overcurrent protection circuit.After fault was got rid of, resin is crystallisation by cooling again, and fuse reverts to low impedance state again.Yet it is this from recovering fuse and be not suitable for to continue the occasion of disconnection repeatedly, work is stable inadequately, easily influenced by ambient temperature, it is too big that its typical failure mode is that the product room temperature resistance becomes, this will make its maintenance electric current diminish, if recover to have surpassed its rated voltage or electric current when fuse is nonserviceabled certainly or the number of times that opens circuit too much, then may be out of shape or burn from recovering fuse.

Utilize liquid metal design to open circuit and current-limiting apparatus receives the concern of correlative study personnel in this area gradually, DE2652506 discloses a kind of electric current switch with liquid metal.This installs used liquid metal and squeezes by machinery and enter contact gap, and the blockage effect by electric current is stabilized and is fixed in the contact gap.The wettable solid state electrode of liquid metal mixture reduces contact impedance.Yet the electric arc between this device solid electrode can cause oxidation in liquid metal, and comparatively speaking, cost is comparatively expensive.

A kind of self-recovery current limiting device based on liquid metal is disclosed among the WO00/77811.This device adopts taper to widen the interface channel of formula, changes liquid metal liquid level and rated current ability to bear with this.This device forms tortuous current path by dislocation layout interface channel, electric arc is lighted when liquid metal is vaporized, thereby the current limitation effect of device is improved.Yet this device design is complicated, can occur during arcing than galling, and useful life is not long.This device is had relatively high expectations to physical conditions such as temperature and pressures, has strengthened design difficulty, and can make circuit conducting again after the liquid metal condensation, so that the interrupting process that duplicates, poor practicability.

The CN1820338A patent disclosure a kind of method and apparatus that is used for current limliting or opens circuit, apply mechanical pressure by piston mobile and the pump that can keep driving pressure to dielectric gas or liquid, the gas of dielectric or liquid are delivered to pressure on the liquid metal, liquid metal is moved in different positions, thereby realize the break-make of circuit, this device can be reversible current limliting and cutout, possess the reaction time faster.Its shortcoming is, this device strict air-tightness must be arranged, and catabolite and the bubble in drive fluid cause problem such as the aging and gas blowing of solid electrode not to be well solved.

Each manufacturing enterprise of the world today and research unit remove in the performance of constantly making great efforts to improve circuit protection device; especially improve outside himself breaking capacity; also along with current electronic technology and fast development of computer technology; promote the items of equipment of electric power system to stride forward, become the requirement of world electric power big country to satisfy China to reach advanced world standards as early as possible to automation, intellectuality and miniaturization.At present, design safe, easy to operate, low-power consumption, stable performance, can reuse, and can realize that the development and application of the circuit protection device of remote auto control has become this field technology worker's research focus.

Summary of the invention

At the deficiencies in the prior art part, the utility model provides a kind of self-recovery current limiting tripper that utilizes conductor fluid and magnetic fluid.This device makes full use of magnetic fluid and the conductor fluid difference at aspects such as density, magnetic; effectively control the shape and the change in location of magnetic fluid and conductor fluid by magnetic field; reach the control circuit size of current; realization is to the effect of controlled circuit overload, short-circuit protection and on-load switch, and realization is to the purpose of electric equipment Long-distance Control.

The self-recovery current limiting tripper of conductor fluid and magnetic fluid that utilizes of the present utility model comprises main body and accessory body two parts: main body comprises the outside solid state electrode terminal of package casing and package casing both sides, package casing and outside solid state electrode terminal constitute closed cavity, be filled with conductor fluid and magnetic fluid in the cavity by different level respectively, promptly conductor fluid and magnetic fluid constitute two levels.

The quantity of closed cavity can be one or more, dividing plate is set in cavity, and inner solid state electrode terminal is set on dividing plate when above when number of cavities is one, and dividing plate is with the volume five equilibrium of cavity.Be filled with conductor fluid and magnetic fluid in each cavity by different level respectively, promptly conductor fluid and magnetic fluid constitute two levels.

Accessory body comprises field generator for magnetic, temperature-adjusting device, and wherein temperature-adjusting device determines whether configuration according to actual needs.When the quantity of closed cavity is one when above, at least two closed cavities of main body connect by inner solid state electrode terminal, at least two closed cavity can be placed on symmetrically on the field generator for magnetic or under, also field generator for magnetic can be fitted between two closed cavities, temperature-adjusting device is positioned under each cavity or the outside.Requiring field generator for magnetic to provide is enough to drive magnetic fluid and makes magnetic fluid drive conductor fluid, and conductor fluid is separated with inner solid state electrode terminal or outside solid state electrode terminal, can reach the gradient magnetic of off-position.

Can satisfy under the situation of cut-offfing controlled circuit by demand for control in assurance, this device can be designed to a closed cavity, be filled with conductor fluid and magnetic fluid in the cavity by different level respectively, promptly conductor fluid and magnetic fluid constitute two levels.Field generator for magnetic is positioned over the top or the bottom of closed cavity, also can be positioned over closed cavity one side.Temperature-adjusting device is positioned under the closed cavity or the outside.Requiring field generator for magnetic to provide is enough to drive magnetic fluid and makes magnetic fluid drive conductor fluid, makes conductor fluid can reach the gradient magnetic of off-position.

Determine whether disposing temperature-adjusting device according to limiting and breaking device of the present utility model place operational environment and controlled circuit current conditions, if conductor fluid and magnetic fluid that heat that the controlled circuit electric current produces and operating ambient temperature can make this limiting and breaking device are in normal operating state, then needn't dispose temperature-adjusting device.

Temperature-adjusting device of the present utility model can be realized at any usual manner of normal steady-working state for guaranteeing conductor fluid and magnetic fluid.For example adopt fan, electric heater, air-cooled heat exchanger, water cooling heat exchanger etc.The normal steady-working state of conductor fluid is: be in liquid condition, its evaporation capacity does not influence the break-make of control circuit, can not influence its electric conductivity and useful life because of being in contact with it the faint physical-chemical reaction that material may exist; The normal operating conditions of magnetic fluid is: be in liquid condition, its evaporation capacity does not influence the break-make of control circuit, can not influence the service behaviour and the useful life of magnetic fluid because of precipitation, evaporation, gathering or magnetic fluid and contacting of conductor fluid etc.

The material that package casing of the present utility model adopts thermoplasticity such as glass, plastics, pottery, epoxy resin or composite material and thermosetting and mechanical performance, insulation property etc. to satisfy the actual design needs suits, and thickness of shell is advisable with the mechanical performance and the heat-transfer effect that guarantee package casing.

The limiting and breaking device of single closed cavity form of the present utility model, the outside solid state electrode terminal that is installed in the package casing two side is communicated with conductor fluid under the circuit normal operating conditions.And when fault need cut off the power supply, outside solid state electrode terminal and conductor fluid disconnected.Promptly when the controlled circuit electric current increased, the gradient magnetic that field generator for magnetic produces acted on magnetic fluid and conductor fluid, causes magnetic fluid to squeeze conductor fluid its generation deformation or position are moved, until conductor fluid and outside solid state electrode terminal are disconnected.

When the quantity of closed cavity is one when above, closed cavity of the present utility model at least two connects by inner solid state electrode terminal, inner solid state electrode terminal and the outside solid state electrode terminal that is installed in the package casing two side are communicated with conductor fluid under the circuit normal operating conditions.And when fault need cut off the power supply, inner solid state electrode terminal and conductor fluid disconnected.

When the quantity of closed cavity is one when above, use the limiting and breaking device of at least two closed cavity forms of the present utility model, when the controlled circuit electric current increases, the gradient magnetic that field generator for magnetic produces acts on magnetic fluid and conductor fluid, cause magnetic fluid to squeeze conductor fluid its generation deformation or position are moved, until conductor fluid and inner solid state electrode terminal are disconnected.Cut off circuit simultaneously at inner solid state electrode terminal two ends, because be that multiple spot cuts off circuit, magnetic fluid is an insulator, possesses certain blow-out effect, thereby has effectively limited the generation of arcing.Closed cavity of the present utility model can be one or more, can form more multibreak according to the number of the circuit protection increase in demand closed cavity of reality, then Zhuan Zhi current limliting and cut-off the effect of circuit can be better.

Can charge into protective gas in the closed cavity of the present utility model; inert gas such as nitrogen, sulphur hexafluoride, argon gas and dry air etc. suit; also closed cavity can be evacuated, the relative vacuum degree scope 0 in the closed cavity all can to-101.325KPa.

As conductor fluid, select liquid metal such as gallium, gallium-indium-tin alloy, mercury, tungsten or analog and supporting electrolyte, conductive ion liquid to suit, supporting electrolyte is sulfate liquor, nitrate solution, chlorate solution etc. for example, and conductive ion liquid is Alcl for example ₃Type ionic liquid or some anions are BF ₄ ^-, PF ₆ ^-Etc. non-Alcl ₃The type ionic liquid all can; The magnetic fluid of good insulating such as that magnetic fluid can be selected for use is water base, organic group, for example water base, oil base, ester group magnetic fluid etc.Dissolve each other hardly between conductor fluid and the magnetic fluid.If dissolve each other, can be between conductor fluid and magnetic fluid blooming, membrane material selects for use polyurethane film, polyester film, polyethylene, polyvinyl chloride etc. to suit.

Conductor fluid and magnetic fluid are filled in the closed cavity, the required current limliting of controlled circuit of looking volume separately open circuit effect and solid state electrode terminal position calculation and obtain, the volume of magnetic fluid and the shared closed cavity of conductor fluid cumulative volume can be selected between 10% to 100% scope, and the volume ratio of magnetic fluid and conductor fluid can be selected between 1/10 to 10 scope.

Temperature-adjusting device in the utility model can guarantee conductor fluid and magnetic fluid in normal operating state, when circuit cut-offs, also can play the effect of cooling off electric arc by heat exchange, can effectively limit the generation of electric arc.

Described gradient magnetic can produce magnetic field by electric current by the field generator for magnetic of place in circuit, when being controlled circuit generation overload or short trouble, directly or indirectly power by electric current to be limited to field generator for magnetic, the gradient magnetic that field generator for magnetic produces acts on magnetic fluid and conductor fluid, cause magnetic fluid to squeeze conductor fluid its generation deformation or position are moved, until conductor fluid and solid state electrode terminal are disconnected.Field generator for magnetic also can adopt permanent magnet, when overload or short trouble take place in controlled circuit, trigger one and turn-off instruction, by this instruction, mechanical device moves to permanent magnet and presets the position, the gradient magnetic that permanent magnet produces on this position acts on magnetic fluid and conductor fluid, causes magnetic fluid to squeeze conductor fluid its generation deformation or position are moved, until conductor fluid and solid state electrode terminal are disconnected.

Field generator for magnetic of the present utility model place circuit or controlled circuit can connect warning devices such as neon tube, buzzer, LED display, when controlled circuit cut-offs circuit because of reason such as break down, play the alarm effect.

During as the overload or short-circuit protection device of controlled circuit; the using method of the utility model device is: this limiting and breaking device main part is inserted controlled circuit, and field generator for magnetic is selected wherein a kind of place in circuit of following four kinds of types of attachment as required.When overload or short trouble generation, field generator for magnetic produces the gradient magnetic of sufficient intensity, the action of a magnetic field that produces is in magnetic fluid and conductor fluid, under the magnetizing force effect, magnetic fluid squeezes conductor fluid moves its generation deformation or position, until conductor fluid and solid state electrode terminal are disconnected, thereby cut-off controlled circuit.

During as the normal duty switch of controlled circuit, the using method of the utility model device is: this apparatus main body is partly inserted controlled circuit, and field generator for magnetic is selected wherein a kind of place in circuit of following four kinds of forms as required.When needs cut-off controlled circuit, closed magnetic field generating means place circuit or the adjusting potentiometer in parallel with field generator for magnetic, perhaps give move of mechanical device, mechanical device is moved to permanent magnet preset the position, make field generator for magnetic produce enough big gradient magnetic, the action of a magnetic field that produces is in magnetic fluid and conductor fluid, under the magnetizing force effect, magnetic fluid squeezes conductor fluid moves its generation deformation or position, until conductor fluid and solid state electrode terminal are disconnected, thereby cut-off controlled circuit.

The form of field generator for magnetic place in circuit of the present utility model has four kinds.

First kind of form: field generator for magnetic is connected in the controlled circuit; produce the gradient magnetic of sufficient intensity when relying on the controlled circuit electric current to change; the action of a magnetic field that produces is in magnetic fluid and conductor fluid; under the magnetizing force effect; magnetic fluid squeezes conductor fluid moves its generation deformation or position; until conductor fluid and solid state electrode terminal are disconnected, thereby the overload or short-circuit protection to controlled circuit is played in cut-offfing of control controlled circuit.When field generator for magnetic adopts the form of first kind of place in circuit, if need this limiting and breaking device to possess the function of on-load switch simultaneously, can be at the other potentiometer in parallel of field generator for magnetic.

Second kind of form: controlled circuit and field generator for magnetic place circuit constitute the former of transformer; secondary coil; former by designing; the number of turn of secondary coil; the electrical quantity of controlled circuit and field generator for magnetic place circuit is changed in the ratio of determining; when the controlled circuit curtage changes; cause field generator for magnetic place circuital current or voltage to change; when the curtage of field generator for magnetic place circuit reaches in advance design load; field generator for magnetic can produce the gradient magnetic of sufficient intensity; the magnetic field magnetropism fluid and the conductor fluid that produce apply magnetizing force; under the magnetizing force effect; magnetic fluid squeezes conductor fluid moves its generation deformation or position; until conductor fluid and solid state electrode terminal are disconnected; thereby cut-offfing of control controlled circuit played the overload or short-circuit protection to controlled circuit.When field generator for magnetic adopts the form of second kind of place in circuit, if need this limiting and breaking device to possess the function of on-load switch simultaneously, can be at the other potentiometer in parallel of field generator for magnetic, at fixed value resistance of field generator for magnetic place major loop series connection.When needs cut-off controlled circuit, closed magnetic field generating means place circuit or the adjusting potentiometer in parallel with field generator for magnetic made field generator for magnetic produce enough big gradient magnetic.

The third form: field generator for magnetic can be connected in the adjunct circuit, and adjunct circuit comprises any thyristor assembly that can electric energy is provided and make it produce the power supply in required magnetic field and connect into circuit to field generator for magnetic.Switch of series connection on the adjunct circuit major loop, switch in parallel in thyristor assembly both sides can closed as required or disconnection.The electric current of adjunct circuit is by the conducting or the shutoff control of thyristor, the conducting of thyristor need be triggered by the overcurrent or the overvoltage of controlled circuit, thyristor is triggered by gate pole and after the conducting, the adjunct circuit conducting, thereby power to field generator for magnetic, the field generator for magnetic of energising produces the gradient magnetic of sufficient intensity, act on magnetic fluid and conductor fluid, causing magnetic fluid to squeeze conductor fluid moves its generation deformation or position, until conductor fluid and solid state electrode terminal are disconnected, thereby cut-off circuit.

The 4th kind of form: field generator for magnetic adopts permanent magnet; adopt mechanical device movable permanent magnet body to produce required the action of a magnetic field in magnetic fluid and conductor fluid; adopt this design form; during as the overload or short-circuit protection device of controlled circuit; the using method of the utility model device is: this limiting and breaking device main part is inserted controlled circuit; field generator for magnetic; it is permanent magnet; fit together with mechanical device movably; mechanical device is placed on the base that is provided with slide rail, and base is fitted in the utility model device main body part.This mechanical device is connected with self-con-tained unit, and self-con-tained unit adopts automatic control equipment commonly used to get final product, and can transmit signal to mechanical device and make the mechanical device operation.When overload or short trouble generation, trigger self-con-tained unit and produce a shutoff instruction, this instruction passes to mechanical device, the mechanical device operation moves to permanent magnet and presets the position, the gradient magnetic that produces at this position permanent magnet can act on magnetic fluid and conductor fluid, cause magnetic fluid to squeeze conductor fluid and make it that deformation take place or move the position, until making the disconnection of conductor fluid and solid state electrode terminal, thereby cut-off controlled circuit.During as the normal duty switch of controlled circuit, the using method of the utility model device is: this apparatus main body is partly inserted controlled circuit, and field generator for magnetic, i.e. permanent magnet is placed in movably on the mechanical device.When needs cut-off controlled circuit, artificial to move of mechanical device, the mechanical device permanent magnet moves to and presets the position, the gradient magnetic that permanent magnet produces acts on magnetic fluid and conductor fluid, causing magnetic fluid to squeeze conductor fluid moves its generation deformation or position, until conductor fluid and solid state electrode terminal are disconnected, thereby cut-off controlled circuit.

The connected mode of first kind and second kind form also can be used for frequently cut-offfing circuit, for power device carries out pulse power supply or produces pulse signal etc., is applicable to the circuit application field of periodically frequent break-make.

The connected mode of first kind and second kind form can be according to the needs that cut-off circuit; after controlled circuit being cut-off at this limiting and breaking device; the state that cut-offs that keeps controlled circuit if desired; this limiting and breaking device and no-voltage protection device assembly can be used; the method of its use is: will insert controlled circuit after the main part of this limiting and breaking device and the no-voltage protection device assembly; when overload or short circuit take place in controlled circuit; this limiting and breaking device cut-offs circuit; trigger the no-voltage protection device action simultaneously; disconnect controlled circuit once more, thereby can avoid the situation of the continuous break-make of controlled circuit to occur.Closed no-voltage protection device or with the potentiometer closed no-voltage protection device in back that resets can recover controlled circuit normally state.

This limiting and breaking device mainly contains two kinds of forms of first, second with the mode that the no-voltage protection device assembly is used.First kind form: with this limiting and breaking device with present stage routine no-voltage protection device directly be used, the two structurally is independently.Second kind form: no-voltage protection device and this current-limiting protection device form composite set; shared same field generator for magnetic; adopt this form can make composite set compact more; and can realize the multifunction of composite set, can implement the effect of overload, short-circuit protection, o-volt protection and on-load switch to controlled circuit.

According to the diverse location of field generator for magnetic, adopt the position of the no-voltage protection device of second kind assembling form also can change thereupon, promptly no-voltage protection device can be placed on the field generator for magnetic or under, and sidewall.

This limiting and breaking device and no-voltage protection device assembly are used, and when no-voltage fault appearred in controlled circuit, no-voltage protection device moved, and controlled circuit is implemented o-volt protection.The mode that this limiting and breaking device and no-voltage protection device assembly are used can be implemented the effect of overload, short-circuit protection, o-volt protection and on-load switch to controlled circuit.

When the connected mode of the third form overload or short trouble occur at controlled circuit, thyristor is triggered, the adjunct circuit conducting, the adjunct circuit power supply is powered to field generator for magnetic, action takes place and cut-offs controlled circuit in this limiting and breaking device, and this type of attachment can provide the lasting state that cut-offs, after fault is got rid of, disconnect the circuit at field generator for magnetic place, this limiting and breaking device recovers normal condition.When using as on-load switch, closed magnetic field generating means place circuit, the adjunct circuit power supply is powered to field generator for magnetic, action takes place and cut-offs controlled circuit in this device, when needing closed controlled circuit, disconnect the circuit at field generator for magnetic place, this limiting and breaking device and controlled circuit recover normal condition.

The utility model device cut-offs circuit simultaneously by two or more breakpoints, can limit electric arc and produce.Adopt two closed cavities in the utility model specific embodiment, promptly two breakpoints have reached good circuit protection effect.As required, also device can be designed to plural closed cavity, form more multibreak, current limliting can be better with the effect of cut-offfing circuit.The utility model can be combined into combined unit with other device that can absorb circuit overvoltage and dump energy, improves whole circuit protection performance.

Limiting and breaking device of the present utility model belongs to electric switch equipment; be applicable to overload, the short-circuit protection of high pressure, middle pressure and low-voltage circuit and the effect of playing the normal duty switch; can cut-off the controlled circuit electric current of 0.01A to the 40KA scope, the scope of application is wider.

The utlity model has following technical characterstic:

(1) this device is configured in the controlled circuit, by the temperature-adjusting device effective heat exchange, temperature rise is low, has reduced the oxidation of solid state electrode, conductor fluid etc.Adopt the form of conductor fluid and solid state electrode termination contact, reduced wearing and tearing, effectively avoided the incident erosion of solid phase contact surface solid state electrode.Simple in structure, stable performance, cost is low, and long service life is easy to mass production.

When (2) breaking down electric current in controlled circuit, field generator for magnetic produces enough big gradient magnetic, rapidly conductor fluid is separated with the solid state electrode terminal, and then realizes the quick disjunction of circuit.The reaction time that reaches Millisecond can effectively be protected the safety of electric equipment, can solve contact burning, be difficult to problems such as disjunction.

(3) magnetic fluid both can play and disconnect the effect that conductor fluid contacts with solid state electrode, also helped to extinguish the electric arc that may occur.Multiple spot divides deenergizing simultaneously, can effectively avoid the electric arc in circuit when outage to produce, and temperature-adjusting device promotes enclosed cavity and extraneous heat exchange, can play the effect of the electric arc that cooling may occur.

(4) this device adopts conductor fluid, has reduced contact resistance, can effectively soak into solid state electrode.Magnetic fluid is for utilizing solid machinery electromagnetic mechanism, motion flexibly under magnetic field, it needn't bring into play the effect of not only conducting electricity but also being subjected to electromagnetic attraction or repulsion in circuit, it needn't be electrode, again as cut-offfing mechanism, repeatedly can produce wearing and tearing after the effect, and then influence the conducting state of circuit and the controlled function of circuit.

(5) this device can be realized auto restore facility.When fault current produced, field generator for magnetic produced gradient magnetic, and this device action takes place cuts off circuit, after fault is got rid of, only need remove magnetic field, and circuit can be realized conducting state.This device is compared the fuse that can realize short-circuit protection, can repeat repeatedly to use, and need not repeatedly to change, and has reduced cost, and easy to use.

(6) this device both can have been realized overload and the short-circuit protection function to controlled circuit, also can realize the effect of on-load switch.Can take to power to field generator for magnetic, make field generator for magnetic produce the mode of gradient magnetic branch deenergizing by adjunct circuit.Can control the conducting state of Be Controlled circuit by the conducting state of control adjunct circuit, can realize controlling the more purpose of high-current circuit with the small electric current circuit.

(7) this device can use with other circuit switchgear assembly, realizes uniting the more optimal function of cut-offfing circuit.According to manufacturing technology commonly used, this device is easy to form integrated device with other device assembly, realizes the remote auto controlled function, possesses the condition to miniaturization, intelligent direction development.

(8) this limiting and breaking device uses the effect that can implement overload, short-circuit protection, o-volt protection and on-load switch to controlled circuit with the no-voltage protection device assembly.

Description of drawings

Fig. 1 is a whole Facad structure schematic diagram of the present utility model;

Principle schematic when Fig. 2 works for the utility model, when wherein Fig. 2 (a) represented the controlled circuit normally, the utility model was in normal condition; State when Fig. 2 (b) cut-offs controlled circuit for action takes place the utility model;

Fig. 3 is three kinds of type of attachment schematic diagrames of field generator for magnetic, and wherein Fig. 3 (a) is first kind of type of attachment of field generator for magnetic; Fig. 3 (b) is second kind of type of attachment of field generator for magnetic; Fig. 3 (c) is the third type of attachment of field generator for magnetic;

Fig. 4 is the assembling form schematic diagram of the utility model and no-voltage protection device, wherein Fig. 4 (a) and Fig. 4 (b) for the utility model adopts single closed cavity, no-voltage protection device is fitted in closed cavity one side, the schematic diagram during shared same field generator for magnetic; Fig. 4 (c) is fitted in no-voltage protection device under the closed cavity for the utility model adopts two closed cavities, the schematic diagram during shared same field generator for magnetic;

Structural representation when Fig. 5 is the single closed cavity of the utility model, wherein, the schematic diagram when Fig. 5 (a) is fitted in closed cavity one side for field generator for magnetic; Schematic diagram when Fig. 5 (b) is fitted under the closed cavity for field generator for magnetic;

Schematic diagram when Fig. 6 is fitted between at least two closed cavities for field generator for magnetic;

Fig. 7 is for moving the schematic diagram of realizing the controlled circuit break-make by mechanical device control permanent magnet position, wherein, Fig. 7 (a) moves apart the predetermined work position view for mechanical device with permanent magnet, and Fig. 7 (b) moves on to the predetermined work position view for mechanical device with permanent magnet.

Among the figure: 1 package casing, 2 outside solid state electrode terminals, 3 magnetic fluids; 4 conductor fluids, 5 temperature-adjusting devices, 6 field generator for magnetic; 7 bottom brackets, 8 controlled circuits, 9 controlled circuit loads; 10 controlled circuit power supplys, 11 potentiometers, 12 fixed value resistances; 13 adjunct circuit power supplys, 14 adjunct circuits, 15 K switch 1; 16 K switch, 2,17 thyristor assemblies, 18 no-voltage protection device pedestals; 19 touch springs, 20 moving contacts, 21 fixed contacts; 22 potential devices; 23 dividing plates, 24 inner solid state electrode terminals, 25 bases; 26 mechanical devices, 27 slide rails.

Embodiment

The design feature and the operation principle of the utility model integral body are as follows.

This device comprises main body and accessory body two parts: main body comprises the outside solid state electrode terminal 2 of package casing 1 and package casing both sides, package casing 1 constitutes closed cavity with outside solid state electrode terminal 2, be filled with conductor fluid 4 and magnetic fluid 3 in the cavity by different level respectively, number of cavities is one when above, be provided with at least one dividing plate 23 in the cavity, dividing plate 23 is provided with inner solid state electrode terminal 24, the volume of dividing plate 23 cavitys such as branch such as grade is filled with conductor fluid 4 and magnetic fluid 3 by different level respectively in each cavity.

Accessory body comprises field generator for magnetic 6, fits together with main part, or fits together with mechanical device 26.

As required can be under each cavity of main body or arranged outside temperature-adjusting device 5 is arranged.

Field generator for magnetic 6 adopts the device that can produce gradient magnetic, this gradient magnetic acts on magnetic fluid 3 and conductor fluid 4, being enough to cause magnetic fluid 3 to drive conductor fluid 4 makes it that deformation or position change take place, conductor fluid 3 is separated with inner solid state electrode terminal 24 or outside solid state electrode terminal 2, reach off-position.

The quantity of closed cavity is one when above, field generator for magnetic 6 be arranged at least two the closed cavity or under, or be assembled between two closed cavities.

When closed cavity quantity was one, field generator for magnetic 6 was arranged on top, bottom or closed cavity one side of closed cavity.

The field generator for magnetic 6 that fits together with mechanical device 26 adopts permanent magnet, and mechanical device 26 is placed on the base 25 that is provided with slide rail 27, and base 25 is assembled on the main part package casing 1.

At place in circuit not or under the controlled circuit normal condition, inner solid state electrode terminal 24 or outside solid state electrode terminal 2 are communicated with conductor fluid 4.

This limiting and breaking device main part is inserted controlled circuit 8, and field generator for magnetic 6 is selected wherein a kind of place in circuit of four kinds of types of attachment mentioned above as required.

Said field generator for magnetic can produce gradient magnetic, can use superconduction magnetite, solenoid, electromagnet or permanent magnet to produce required magnetic field.The solid state electrode terminal can the field generator for magnetic assembly, and according to the design needs, the solid state electrode terminal can be used as the iron core of solenoid.

Field generator for magnetic is during with the connected mode place in circuit of first kind and second kind form; can be according to the needs that cut-off circuit; after controlled circuit being cut-off at this limiting and breaking device; the state that cut-offs that keeps controlled circuit if desired; this limiting and breaking device and no-voltage protection device assembly can be used, basic assembling form can be referring to Fig. 4.When controlled circuit was in the normally state, because the sucking action of electromagnetic force, the moving contact 20 of no-voltage protection device contacted well with fixed contact 21.When this limiting and breaking device cut-off controlled circuit, the electromagnetic force that field generator for magnetic applies disappeared, and the elastic force of touch spring 19 makes moving contact 20 separate rapidly with fixed contact 21, disconnects controlled circuit once more, and lasting off state is provided.After fault is got rid of, contact with fixed contact 21 by the moving contact 20 of mechanical force, thereby make the no-voltage protection device closure no-voltage protection device, controlled circuit recovers conducting.

Field generator for magnetic with first kind of type of attachment place in circuit shown in Fig. 3 (a), the operation principle of this circuit protection device as shown in Figure 2:

1. as the overload or short-circuit protection device:

A) under the normal conducting state situation of controlled circuit, line current flows through conductor fluid.Conductor fluid and solid state electrode termination contact are good.

When b) overload or short trouble take place in circuit, controlled circuit 8 electric currents increase, field generator for magnetic 6 produces enough big gradient magnetic, gradient magnetic acts on magnetic fluid 3 and conductor fluid 4, causing magnetic fluid 3 to squeeze conductor fluid 4 moves its generation deformation or position, until conductor fluid 4 and inner solid state electrode terminal terminal 24 are disconnected, realize the quick disjunction of circuit.Because inner solid state electrode terminal 24 two ends are disjunction simultaneously almost, add temperature-adjusting device 5 and the interior effective heat exchange of enclosed cavity, effectively limit the generation of electric arc.

C) when controlled circuit generation overload or short circuit, this limiting and breaking device cut-offs controlled circuit rapidly, and the lasting state that cut-offs is provided if desired, and this limiting and breaking device can use with the no-voltage protection device assembly, as shown in Figure 4.When this limiting and breaking device cut-offs controlled circuit, trigger the no-voltage protection device action simultaneously, disconnect controlled circuit once more, lasting off state is provided.After fault was got rid of, with the no-voltage protection device closure, controlled circuit is conducting again.

2. as the on-load switch of control circuit break-make:

I) under the normal conducting state situation of circuit, line current flows through conductor fluid, and conductor fluid and solid state electrode termination contact are good.

II) in the time of need cut-offfing controlled circuit 8, regulate the potentiometer 11 in parallel with field generator for magnetic 6, the electric current that flows through field generator for magnetic 6 is increased, field generator for magnetic 6 produces enough big gradient magnetic, gradient magnetic acts on magnetic fluid 3 and conductor fluid 4, cause magnetic fluid 3 to squeeze conductor fluid 4 its generation deformation or position are moved,, realize the quick disjunction of circuit until conductor fluid and inner solid state electrode terminal 24 are disconnected.Because inner solid state electrode terminal 24 two ends are disjunction simultaneously almost, add temperature-adjusting device 5 and the interior effective heat exchange of enclosed cavity, effectively limit the generation of electric arc.

III) when controlled circuit is cut-off, the lasting state that cut-offs is provided if desired, this limiting and breaking device can use with the no-voltage protection device assembly, as shown in Figure 4.When this limiting and breaking device cut-offs controlled circuit, trigger the no-voltage protection device action simultaneously, disconnect controlled circuit once more; lasting off state is provided, after fault is got rid of, potentiometer 11 is recalled to initial condition; with the no-voltage protection device closure, controlled circuit recovers original conducting state.

Field generator for magnetic with second kind of type of attachment place in circuit shown in Fig. 3 (b), the operation principle of this limiting and breaking device as shown in Figure 2:

1. as the overload or short-circuit protection device:

A) under the normal conducting state situation of controlled circuit, line current flows through conductor fluid.Conductor fluid and solid state electrode termination contact are good.

When b) overload or short trouble take place in circuit, controlled circuit 8 electric currents increase, because the effect of potential device 22, cause field generator for magnetic 6 place circuital currents to increase, field generator for magnetic 6 produces enough big gradient magnetic, gradient magnetic act on magnetic fluid 3 and conductor fluid 4, cause magnetic fluid 3 to squeeze conductor fluid 4 its generation deformation or position moved, until conductor fluid 4 and inner solid state electrode terminal 24 are disconnected, realize the quick disjunction of circuit.Because inner solid state electrode terminal 24 two ends are disjunction simultaneously almost, add temperature-adjusting device 5 and the interior effective heat exchange of enclosed cavity, effectively limit the generation of electric arc.

C) when controlled circuit generation overload or short circuit, this limiting and breaking device cut-offs controlled circuit rapidly, and the lasting state that cut-offs is provided if desired, and this limiting and breaking device can use with the no-voltage protection device assembly, as shown in Figure 4.When this limiting and breaking device cut-offs controlled circuit, trigger the no-voltage protection device action simultaneously, disconnect controlled circuit once more, lasting off state is provided.After fault was got rid of, with the no-voltage protection device closure, controlled circuit is conducting again.

2. as the on-load switch of control circuit break-make:

I) under the normal conducting state situation of circuit, line current flows through conductor fluid, and conductor fluid and solid state electrode termination contact are good.

II) in the time of need cut-offfing controlled circuit, regulate the potentiometer 11 in parallel with field generator for magnetic, the electric current that flows through field generator for magnetic is increased, field generator for magnetic produces enough big gradient magnetic, gradient magnetic act on magnetic fluid 3 and conductor fluid 4, cause magnetic fluid 3 to squeeze conductor fluid 4 its generation deformation or position are moved,, realize the quick disjunction of circuit until conductor fluid and inner solid state electrode terminal 24 are disconnected.Because inner solid state electrode terminal 24 two ends are disjunction simultaneously almost, add the effective heat exchange in temperature-adjusting device and the enclosed cavity, effectively limit the generation of electric arc.

III) when controlled circuit is cut-off, the lasting state that cut-offs is provided if desired, this limiting and breaking device can use with the no-voltage protection device assembly, as shown in Figure 4.When this limiting and breaking device cut-offs controlled circuit, trigger the no-voltage protection device action simultaneously, disconnect controlled circuit once more, lasting off state is provided.After fault is got rid of, potentiometer 11 is recalled to initial condition, with the no-voltage protection device closure, controlled circuit recovers original conducting state.

Shown in Fig. 3 (c), the operation principle of this limiting and breaking device as shown in Figure 2 with the third type of attachment place in circuit for field generator for magnetic

1. as the overload or short-circuit protection device:

A) under the normal conducting state situation of circuit, line current flows through conductor fluid, and is very little to line loss.

When b) overload or short trouble take place in circuit, the 14 rapid conductings of thyristor assembly 17 place adjunct circuits, field generator for magnetic 6 is enough big gradient magnetic because of energising produces, gradient magnetic act on magnetic fluid 3 and conductor fluid 4, causing magnetic fluid 3 to squeeze conductor fluid 4 moves its generation deformation or position, until conductor fluid and inner solid state electrode terminal 24 are disconnected, realize the quick disjunction of circuit.Because inner solid state electrode terminal 24 two ends are disjunction simultaneously almost, add temperature-adjusting device 5 and the interior effective heat exchange of enclosed cavity, can limit the generation of electric arc.

C) because of adjunct circuit 14 sustainable power supplies, this device can provide lasting off state, after fault is got rid of, disconnects adjunct circuit switch 16, and complementary field disappears, and two liquid are replied original state, controlled circuit 8 conducting again.

2. as the on-load switch of control circuit break-make:

I) under the normal conducting state situation of circuit, line current flows through conductor fluid, and is very little to line loss.Adjunct circuit switch 15 is in the state of cut-offfing at this moment.

II) in the time of need cut-offfing controlled circuit 8, closed adjunct circuit switch 15, adjunct circuit 14 conductings, adjunct circuit power supply 13 is to field generator for magnetic 6 power supplies, field generator for magnetic 6 produces enough big gradient magnetic, gradient magnetic act on magnetic fluid 3 and conductor fluid 4, cause magnetic fluid 3 to squeeze conductor fluid 4 its generation deformation or position moved, until conductor fluid 4 and inner solid state electrode terminal 24 are disconnected, realize the quick disjunction of circuit.

III) when needs closure controlled circuit, cut-off adjunct circuit switch 16 or 15, all can make controlled circuit 8 get back to conducting state.

Field generator for magnetic selects the 4th kind of type of attachment to produce required gradient magnetic, as shown in Figure 7.Adopt mechanical device movable permanent magnet body to produce required magnetic field, the main part of limiting and breaking device and slide rail 27 are installed on the base 25, permanent magnet 6 with can electrically driven (operated) mechanical device 26 assembly be placed on the slide rail 27, the operation principle of this limiting and breaking device is shown in Fig. 7 (a) and Fig. 7 (b).

1. as the overload or short-circuit protection device:

A) under the normal conducting state situation of circuit, line current flows through conductor fluid, and is very little to line loss.Mechanical device and permanent magnet position such as Fig. 7 (a).

B) shown in Fig. 7 (b), when overload or short trouble take place in circuit, trigger one and turn-off instruction, by this instruction, mechanical device 26 moves to permanent magnet 6 and presets the position by slide rail 27, the gradient magnetic that permanent magnet 6 produces acts on magnetic fluid 3 and conductor fluid 4, causes magnetic fluid 3 to squeeze conductor fluid 4 its generation deformation or position are moved, until conductor fluid 4 and solid state electrode terminal 2 are disconnected, thereby cut-off controlled circuit.

C) this device can provide lasting off state, after fault is got rid of, by mechanical device 26 permanent magnet 6 is moved apart pre-design position, and two liquid are replied original state, and controlled circuit is conducting again.

2. as the on-load switch of control circuit break-make:

I) under the normal conducting state situation of circuit, line current flows through conductor fluid, and is very little to line loss.Mechanical device and permanent magnet position such as Fig. 7 (a).

II) shown in Fig. 7 (b), in the time of need cut-offfing controlled circuit 8, giving can 26 1 move of electrically driven (operated) mechanical device, mechanical device 26 moves to permanent magnet 6 and presets the position by slide rail 27, the gradient magnetic that permanent magnet 6 produces acts on magnetic fluid 3 and conductor fluid 4, cause magnetic fluid 3 to squeeze conductor fluid 4 and make it that deformation take place or move the position, until conductor fluid 3 and solid state electrode terminal 2 are disconnected, thereby cut-off controlled circuit.

III) this device can provide lasting off state, after fault is got rid of, by mechanical device 26 permanent magnet 6 is moved apart pre-design position, and two liquid are replied original state, and controlled circuit is conducting again.

Field generator for magnetic produces enough big gradient magnetic and acts on magnetic fluid and conductor fluid, causes magnetic fluid to squeeze conductor fluid and makes its generation deformation or position change, can be according to actual needs designs with the placement location of field generator for magnetic.

In order to select magnetic fluid and conductor fluid according to the controlled circuit concrete condition, and obtain required magnetic field, thereby design or select suitable field generator for magnetic provides a quantitative example at this according to the simplest form of implementation among Fig. 2.Conductor fluid and magnetic fluid move in gradient magnetic and finally reach static deformed state, and two kinds of fluid interface deformation height can obtain by formula (one):

$h={\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="Y2009200143390027H2.png,Y2009200143390030H1.png"\; state="\{\{state\}\}">K</figure-callout>}}_1\frac{|{\mathrm{<figure-callout\; id="1"\; label="B"\; filenames="Y2009200143390027H2.png,Y2009200143390030H1.png"\; state="\{\{state\}\}">B</figure-callout>}}_1^2-{\mathrm{<figure-callout\; id="2"\; label="B"\; filenames="Y2009200143390027H1.png,Y2009200143390027H2.png"\; state="\{\{state\}\}">B</figure-callout>}}_2^2|(X_1-k_2{X}_2)}{{2\mathrm{\&mu;}}_{A}g({\mathrm{\&rho;}}_1-{\mathrm{\&rho;}}_2)}$ (1)

In the formula, h is the difference in height at two different deformation places of interface, μ _ABe the magnetic permeability of conductor fluid, k ₂For the ratio of magnetic fluid, be expressed as k=μ with the magnetic permeability of conductor fluid _B/ μ _A, μ _BBe the magnetic permeability of magnetic fluid, X ₁Be the volume susceptibility of conductor fluid, X ₂Be the volume susceptibility of magnetic fluid, B ₁And B ₂Be respectively the magnetic flux density at two different deformation places of interface, ρ ₁Be the density of conductor fluid, ρ ₂Be the density of magnetic fluid, g is a local gravitational acceleration, K ₁Being the correction factor that edits according to the actual design condition, is a characteristic.

According to the geomery and closed cavity inner fluid and the relative position of solid state electrode terminal and the different demands of cut-offfing of this limiting and breaking device, can design different field generator for magnetic, select different conductor fluid and magnetic fluid.The selection of conductor fluid and magnetic fluid requires to apply behind the magnetic field magnetic fluid and drives conductor fluid and make it that deformation or position take place to move and be enough to separate solid state electrode terminal and conductor fluid.After this limiting and breaking device inserts controlled circuit, variation along with current value in the controlled circuit, field generator for magnetic produces gradient magnetic, when gradient magnetic intensity reaches design load, magnetic fluid and conductor fluid in the closed cavity are subjected to the magnetizing force effect, magnetic fluid is given the exerting pressure effect of surface of conductor fluid, conductor fluid is changed with solid state electrode termination contact area or disconnect and being connected thereby squeeze conductor fluid, thereby realization is to the current limliting of controlled circuit and/or open circuit.

According to the design feature and the operation principle of foregoing circuit protective device, below specifically further specify with embodiment.

Embodiment 1

A kind of self-recovery current limiting tripper that utilizes conductor fluid and magnetic fluid as shown in Figure 1, field generator for magnetic 6 adopts the third types of attachment shown in Fig. 3 (c), and selecting maximum magnetic induction in the present embodiment for use is that the electromagnet of 0.4T is as field generator for magnetic 6.Package casing 1 adopts ceramic material to make, form two identical closed cavities with dividing plate 23 and solid state electrode terminal 2, solid state electrode terminal 24, each closed cavity size (length * wide * height) is 40mm * 20mm * 20mm, the MF03 type magnetic fluid 3 that adopts the refreshing right magnetic fluid technology Co., Ltd in Beijing to produce, its density is 1320kg/m ³, saturation magnetization is 450GS, adopts the liquid metal gallium as conductor fluid 4, its density is 5907kg/m ³, liquid metal gallium and magnetic fluid equal-volume are injected closed cavity respectively, magnetic fluid is last, and gallium is following, and the cumulative volume of magnetic fluid and liquid metal gallium accounts for 90% of closed cavity, and the closed cavity remaining space is evacuated, and the relative vacuum degree is-100Kpa.Outside solid state electrode terminal 2 is all chosen the long 10mm that is with inner solid state electrode terminal 24, diameter is the copper electrode of 5mm, two closed cavities of main body connect by inner solid state electrode terminal 24, and symmetrical being placed on the field generator for magnetic 6, KTO011 heat radiation constant temperature regulator and the fan collocation of adopting the glad sharp special Electronics Co., Ltd. in Shenzhen to sell are used as temperature-adjusting device 5, in the space that placement bottom bracket 7 is surrounded, by effective heat exchange, the temperature in the closed cavity is remained on 35 ℃.

Shown in Fig. 1 and Fig. 3 (c); when using: switch 16 closures of adjunct circuit as the overload or short-circuit protection device; switch 15 disconnects; controlled circuit 8 electric currents are transferred to 1360A as short circuit current, thyristor assembly 17 conducting that is triggered, thus make adjunct circuit power supply 13 to field generator for magnetic 6 power supplies; it is the gradient magnetic of 0.4T that field generator for magnetic 6 produces maximum magnetic induction; control magnetic fluid 3 and conductor fluid 4 actions, when 5ms, controlled circuit 8 is cut off.Disconnect the switch 16 of adjunct circuit, adjunct circuit 14 is disconnected, and the magnetic field that field generator for magnetic 6 produces disappears, and conductor fluid 4 and magnetic fluid 3 restPose, and controlled circuit 8 is switched on again.

Shown in Fig. 1 and Fig. 3 (c), during as the on-load switch of control circuit break-make: switch 16 closures of adjunct circuit, switch 15 disconnects, and controlled circuit 8 electric currents are transferred to 1250A as the normal duty electric current, thyristor assembly 17 conducting that is not triggered, thus make adjunct circuit 14 be in the state of cut-offfing.The switch 15 of closed adjunct circuit, adjunct circuit 14 is switched on, and adjunct circuit power supply 13 is to field generator for magnetic 6 power supplies, it is the gradient magnetic of 0.4T that field generator for magnetic 6 produces maximum magnetic induction, control magnetic fluid 3 and liquid metal 4 actions, when 4ms, controlled circuit 8 is cut off.Disconnect the switch 16 or 15 of adjunct circuit, adjunct circuit 14 all can be disconnected, and the magnetic field that field generator for magnetic 6 produces disappears, and conductor fluid 4 and magnetic fluid 3 restPose, and controlled circuit 8 is switched on again.

Embodiment 2

A kind of self-recovery current limiting tripper that utilizes conductor fluid and magnetic fluid as shown in Figure 1; this limiting and breaking device uses with the no-voltage protection device assembly; shown in Fig. 4 (c); field generator for magnetic 6 adopts second kind of type of attachment; shown in Fig. 3 (b), selecting maximum magnetic induction in the present embodiment for use is that the electromagnet of 0.1T is as field generator for magnetic 6.With controlled circuit 8 primary coil as potential device 22, field generator for magnetic 6 place circuit are as the secondary coil of potential device 22, and the type of attachment of potentiometer 11 and fixed value resistance 12 is shown in Fig. 3 (b).Package casing 1 adopts glass material to make, form two identical closed cavities with dividing plate 23 and solid state electrode terminal 2, solid state electrode terminal 24, each closed cavity size (length * wide * height) is 40mm * 20mm * 20mm, the MF03 type magnetic fluid 3 that magnetic fluid adopts the refreshing right magnetic fluid technology Co., Ltd in Beijing to produce, its density is 1320kg/m ³, saturation magnetization is 450GS, adopts the liquid metal gallium-indium-tin alloy as conductor fluid 4, according to proportioning, its density is decided to be 6378kg/m ³The gallium-indium-tin alloy that will account for closed cavity 40% volume earlier injects closed cavity, on the gallium-indium-tin alloy surface, add thickness and be the polyurethane film of 0.04mm, and film is fixed on the package casing 1, the magnetic fluid 3 that will account for closed cavity 50% volume again injects closed cavity, magnetic fluid is last, and gallium-indium-tin alloy is following.Outside solid state electrode terminal 2 is all chosen the long 8mm that is with inner solid state electrode terminal 24, and diameter is the copper electrode of 4mm.Two closed cavities of main body connect by inner solid state electrode terminal 24, and symmetrical being placed on the field generator for magnetic 6, and this experiment is at room temperature carried out.

Shown in Fig. 1, Fig. 3 (b) and Fig. 4 (c); when using: controlled circuit 8 voltages are transferred to 380V as normal duty voltage as the overload or short-circuit protection device; controlled circuit 8 voltages are transferred to 500V as overvoltage; this moment, field generator for magnetic 6 place circuit voltages raise; it is the gradient magnetic of 0.1T that field generator for magnetic 6 produces maximum magnetic induction; control magnetic fluid 3 and conductor fluid 4 actions, when 10ms, controlled circuit 8 is cut off.The elastic force of touch spring 19 makes moving contact 20 separate rapidly with fixed contact 21, disconnects controlled circuit 8 once more, and lasting off state is provided.After fault is got rid of, contact with fixed contact 21 by the moving contact 20 of mechanical force no-voltage protection device, controlled circuit 8 recovers conducting.

Shown in Fig. 1, Fig. 3 (b) and Fig. 4 (c), during as the on-load switch of control circuit break-make: controlled circuit 8 voltages are transferred to 380V as normal duty voltage, regulator potentiometer 11 (RHQ26 series, Shanghai Jiang Jingxiang Electronics Co., Ltd. produces), this moment, field generator for magnetic 6 both end voltage raise, and electric current increases, it is the gradient magnetic of 0.1T that field generator for magnetic 6 produces maximum magnetic induction, control magnetic fluid 3 and conductor fluid 4 actions, when 12ms, controlled circuit 8 is cut off.The elastic force of touch spring 19 makes moving contact 20 separate rapidly with fixed contact 21, disconnects controlled circuit once more, and lasting off state is provided.After fault is got rid of, potentiometer 11 is resetted, contact with fixed contact 21 by the moving contact 20 of mechanical force no-voltage protection device, controlled circuit 8 recovers conducting.

Embodiment 3

A kind of self-recovery current limiting tripper that utilizes conductor fluid and magnetic fluid as shown in Figure 1; this limiting and breaking device uses with the no-voltage protection device assembly; shown in Fig. 4 (c); field generator for magnetic 6 adopts first kind of type of attachment; shown in Fig. 3 (a); select for use in the present embodiment maximum magnetic induction be the electromagnet of 0.3T as field generator for magnetic 6, potentiometer 11 types of attachment are shown in Fig. 3 (a).Package casing 1 adopts epoxide resin material to make, form two identical closed cavities with dividing plate 23 and solid state electrode terminal 2, solid state electrode terminal 24, each closed cavity size (length * wide * height) is 40mm * 20mm * 20mm, the MF03 type magnetic fluid 3 that adopts the refreshing right magnetic fluid technology Co., Ltd in Beijing to produce, adopt liquid metal mercury as conductor fluid 4, its density is 13590g/m ³, mercury and magnetic fluid equal-volume are injected closed cavity respectively, magnetic fluid is last, and mercury is following, and the cumulative volume of magnetic fluid and liquid metal mercury accounts for 100% of closed cavity.Outside solid state electrode terminal 2 is all chosen the long 10mm that is with inner solid state electrode terminal 24, and diameter is the copper electrode of 5mm.Two closed cavities of main body connect by inner solid state electrode terminal 24, and symmetrical being placed on the field generator for magnetic 6, and this experiment is at room temperature carried out.

As Fig. 1; shown in Fig. 3 (a) and Fig. 4 (c); when using: controlled circuit 8 voltages are transferred to 220V as normal duty voltage as the overload or short-circuit protection device; controlled circuit 8 voltages are transferred to 400V as overvoltage; this moment, field generator for magnetic 6 place circuital currents increased; it is the gradient magnetic of 0.3T that field generator for magnetic 6 produces maximum magnetic induction; control magnetic fluid 3 and conductor fluid 4 actions; when 20ms; controlled circuit 8 is cut off; the elastic force of touch spring 19 makes moving contact 20 separate rapidly with fixed contact 21; disconnect controlled circuit 8 once more, lasting off state is provided.After fault is got rid of, contact with fixed contact 21 by the moving contact 20 of mechanical force no-voltage protection device, controlled circuit 8 recovers conducting.

Shown in Fig. 1, Fig. 3 (a) and Fig. 4 (c), during as the on-load switch of control circuit break-make: controlled circuit voltage is transferred to 400V as normal duty voltage, regulator potentiometer 11 (RHQ26 series, Shanghai Jiang Jingxiang Electronics Co., Ltd. produces), this moment, field generator for magnetic 6 both end voltage raise, and electric current increases, it is the gradient magnetic of 0.3T that field generator for magnetic 6 produces maximum magnetic induction, control magnetic fluid 3 and conductor fluid 4 actions, when 17ms, controlled circuit 8 is cut off.The elastic force of touch spring 19 makes moving contact 20 separate rapidly with fixed contact 21, disconnects controlled circuit once more, and lasting off state is provided.After fault is got rid of, potentiometer 11 is resetted, contact with fixed contact 21 by the moving contact 20 of mechanical force no-voltage protection device, controlled circuit recovers conducting.

Embodiment 4

A kind of self-recovery current limiting tripper such as Fig. 5 (b) that utilizes conductor fluid and magnetic fluid, select for use in the present embodiment maximum magnetic induction be the solenoid type electromagnet of 0.05T as field generator for magnetic 6, adopt the third connected mode, shown in Fig. 3 (c).Package casing 1 adopts ceramic material to make, form a closed cavity with solid state electrode terminal 2, closed cavity size (length * wide * height) is 30mm * 15mm * 15mm, the MF04 type magnetic fluid 3 that adopts the refreshing right magnetic fluid technology Co., Ltd in Beijing to produce, and its density is 1310kg/m ³, saturation magnetization is 450 Gausses, adopts copper-bath as conductor fluid 4, its density is 1133kg/m ³The magnetic fluid 3 that will account for closed cavity 40% volume earlier injects closed cavity; on magnetic fluid 3 surfaces, add thickness and be the polyvinyl chloride film of 0.08mm; and film is fixed on the package casing 1; again isopyknic copper-bath is injected closed cavity; magnetic fluid is following, and copper-bath charges into the protective gas argon gas last in closed cavity.Solid state electrode terminal 2 is chosen the long 8mm that is, diameter is the copper electrode of 4mm, and closed cavity is placed under the field generator for magnetic 6, and this experiment is at room temperature carried out.

Shown in Fig. 5 (b) and Fig. 3 (c); when using: switch 16 closures of adjunct circuit as the overload or short-circuit protection device; switch 15 disconnects; controlled circuit 8 electric currents are transferred to 0.02A as short circuit current, thyristor assembly 17 conducting that is triggered, thus make adjunct circuit power supply 13 to field generator for magnetic 6 power supplies; it is the gradient magnetic of 0.05T that field generator for magnetic 6 produces maximum magnetic induction; control magnetic fluid 3 and conductor fluid 4 actions, when 5ms, controlled circuit 8 is cut off.Disconnect the switch 16 of adjunct circuit, adjunct circuit 14 is disconnected, and the magnetic field that field generator for magnetic 6 produces disappears, and conductor fluid 4 and magnetic fluid 3 restPose, and controlled circuit 8 is switched on again.

Shown in Fig. 5 (b) and Fig. 3 (c), during as the on-load switch of control circuit break-make: switch 16 closures of adjunct circuit, switch 15 disconnects, controlled circuit 8 electric currents are transferred to 0.01A as the normal duty electric current, thyristor assembly 17 conducting that is not triggered, thus make adjunct circuit 14 be in the state of cut-offfing.The switch 15 of closed adjunct circuit, adjunct circuit 14 is switched on, and adjunct circuit power supply 13 is to field generator for magnetic 6 power supplies, it is the gradient magnetic of 0.05T that field generator for magnetic 6 produces maximum magnetic induction, control magnetic fluid 3 and conductor fluid 4 actions, when 4ms, controlled circuit 8 is cut off.The switch 15 or 16 that disconnects adjunct circuit all can disconnect adjunct circuit 14, thereby the magnetic field that field generator for magnetic 6 is produced disappears, and conductor fluid 4 and magnetic fluid 3 restPose, and controlled circuit 8 is switched on again.

Embodiment 5

A kind of self-recovery current limiting tripper such as Fig. 6 that utilizes conductor fluid and magnetic fluid.Select for use in the present embodiment maximum magnetic induction be the solenoid of 0.4T as field generator for magnetic 6, field generator for magnetic 6 installation sites as shown in Figure 6, field generator for magnetic 6 adopts second kind of type of attachment, shown in Fig. 3 (b).With controlled circuit 8 primary coil as potential device 22, field generator for magnetic 6 place circuit are as the secondary coil of potential device 22, and the type of attachment of potentiometer 11 and fixed value resistance 12 is shown in Fig. 3 (b).Package casing 1 adopts glass material to make, form two identical closed cavities with dividing plate 23 and solid state electrode terminal 2, solid state electrode terminal 24, each closed cavity size (length * wide * height) is 40mm * 20mm * 20mm, outside solid state electrode terminal 2 is all chosen the long 10mm that is with inner solid state electrode terminal 24, and diameter is the copper electrode of 5mm.Two closed cavities of main body connect by inner solid state electrode terminal 24.The MFZ type magnetic fluid 3 that adopts the refreshing right magnetic fluid technology Co., Ltd in Beijing to produce, its density is 1270kg/m ³, saturation magnetization is 450 Gausses, adopts the liquid metal gallium as conductor fluid 4, its density is 5907kg/m ³Gallium and magnetic fluid equal-volume are injected closed cavity respectively, and gallium is following, and magnetic fluid is last, and the cumulative volume of magnetic fluid and liquid metal gallium accounts for 50% of closed cavity, charges into nitrogen as protective gas in closed cavity.KTO011 heat radiation constant temperature regulator and fan collocation that the glad sharp special Electronics Co., Ltd. in employing Shenzhen sells are used as temperature-adjusting device 5, in the space that placement bottom bracket 7 is surrounded, by effective heat exchange, the temperature in the closed cavity are remained on 35 ℃.

Shown in Fig. 6 and Fig. 3 (b); when using: controlled circuit 8 voltages are transferred to 4000V as normal duty voltage as the overload or short-circuit protection device; controlled circuit 8 voltages are transferred to 4500V as overvoltage; this moment, field generator for magnetic 6 place circuit voltages raise; it is the gradient magnetic of 0.4T that field generator for magnetic 6 produces maximum magnetic induction; control magnetic fluid 3 and conductor fluid 4 actions; when 10ms; controlled circuit 8 is cut off; field generator for magnetic 6 magnetic fields disappear; conductor fluid 4 and magnetic fluid 3 recover original state, and controlled circuit is switched on immediately, and begins to repeat to cut-off and conducting state.

Embodiment 6

A kind of self-recovery current limiting tripper of conductor fluid and magnetic fluid that utilizes is put as Fig. 5 (a).This limiting and breaking device uses with the no-voltage protection device assembly, and shown in Fig. 4 (b), field generator for magnetic 6 adopts first kind of type of attachment, shown in Fig. 3 (a).Package casing 1 adopts epoxide resin material to make, form a closed cavity with solid state electrode terminal 2, closed cavity size (length * wide * height) is 40mm * 20mm * 20mm, selecting maximum magnetic induction in the present embodiment for use is that the electromagnet of 0.3T is as field generator for magnetic 6, the MFK type magnetic fluid 3 that adopts the refreshing right magnetic fluid technology Co., Ltd in Beijing to produce, its density is 1480kg/m ³, saturation magnetization is 450 Gausses, adopts ionic liquid Br-Alcl ₃As conductor fluid 4, its density is 1575kg/m ³, will account for the ionic liquid Br-Alcl of closed cavity 45% volume earlier ₃Inject closed cavity, adding thickness on the ionic liquid surface is the polyurethane film of 0.06mm, and film is fixed on the package casing 1, and the magnetic fluid 3 that will account for closed cavity 40% volume again injects closed cavity, charges into nitrogen in closed cavity.Solid state electrode terminal 2 is chosen the long 15mm that is, diameter is the ferroelectric utmost point of 10mm, and with the iron core of this ferroelectric utmost point as electromagnet, this experiment is at room temperature carried out.

Shown in Fig. 5 (a), Fig. 3 (a) and Fig. 4 (b); when using: controlled circuit 8 voltages are transferred to 10V as normal duty voltage as the overload or short-circuit protection device; controlled circuit 8 voltages are transferred to 20V as overvoltage; this moment, field generator for magnetic 6 place circuital currents increased; it is the gradient magnetic of 0.3T that field generator for magnetic 6 produces maximum magnetic induction; control magnetic fluid and ionic liquid action, when 10ms, controlled circuit 8 is cut off.The elastic force of touch spring 19 makes moving contact 20 separate rapidly with fixed contact 21, disconnects controlled circuit 8 once more, and lasting off state is provided.After fault is got rid of, contact with fixed contact 21 by the moving contact 20 of mechanical force no-voltage protection device, controlled circuit 8 recovers conducting.

Shown in Fig. 5 (a), Fig. 3 (a) and Fig. 4 (b), during as the on-load switch of control circuit break-make: controlled circuit 8 voltages are transferred to 10V as normal duty voltage, regulator potentiometer 11, this moment, field generator for magnetic 6 both end voltage raise, electric current increases, and it is the gradient magnetic of 0.3T that field generator for magnetic 6 produces maximum magnetic induction, control magnetic fluid and ionic liquid action, when 8ms, controlled circuit is cut off.The elastic force of touch spring 19 makes moving contact 20 separate rapidly with fixed contact 21, disconnects controlled circuit 8 once more, and lasting off state is provided.After fault is got rid of, potentiometer 11 is resetted, contact with fixed contact 21 by the moving contact 20 of mechanical force no-voltage protection device, controlled circuit 8 recovers conducting.

Embodiment 7

A kind of self-recovery current limiting tripper that utilizes conductor fluid and magnetic fluid as shown in Figure 6.Field generator for magnetic 6 adopts first kind of type of attachment, shown in Fig. 3 (a), inner solid state electrode terminal 24 adopts selects the long 20mm that is for use, diameter is the ferroelectric utmost point of 10mm, and the ferroelectric utmost point combined the field generator for magnetic 6 that maximum magnetic induction is 0.6T with it as the iron core of solenoid coil, as shown in Figure 6.Package casing 1 adopts glass material, form two identical closed cavities with dividing plate 23 and solid state electrode terminal 2, solid state electrode terminal 24, each closed cavity size (length * wide * height) is 40mm * 20mm * 20mm, the MF03 type magnetic fluid that adopts the refreshing right magnetic fluid technology Co., Ltd in Beijing to produce, adopt the liquid metal gallium as conductor fluid, its density is 5907kg/m ³, gallium and magnetic fluid equal-volume are injected closed cavity respectively, magnetic fluid is last, and gallium is following, and the cumulative volume of magnetic fluid and liquid metal gallium accounts for 80% of closed cavity, charges into dry air in closed cavity.Two closed cavities of main body connect by inner solid state electrode terminal 24, KTO011 heat radiation constant temperature regulator and the collocation of HGK 047 electric heater of adopting the glad sharp special Electronics Co., Ltd. in Shenzhen to sell are used as temperature-adjusting device 5, in the space that placement bottom bracket 7 is surrounded, by effective heat exchange, the temperature in the closed cavity is remained on 35 ℃.

As Fig. 3 (a) and shown in Figure 6; when using: controlled circuit 8 voltages are transferred to 220V as normal duty voltage as the overload or short-circuit protection device; controlled circuit voltage is transferred to 400V as overvoltage; this moment, field generator for magnetic place circuital current increased; it is the gradient magnetic of 0.6T that field generator for magnetic 6 produces maximum magnetic induction; control magnetic fluid 3 and conductor fluid 4 actions; when 11ms; controlled circuit is cut off; field generator for magnetic 6 magnetic fields disappear; conductor fluid 4 and magnetic fluid 3 recover original state, and controlled circuit is switched on immediately, and begins to repeat to cut-off and conducting state.

As Fig. 3 (a) and shown in Figure 6, during as the on-load switch of control circuit break-make: controlled circuit voltage is transferred to 400V as normal duty voltage, regulator potentiometer 11, this moment, field generator for magnetic 6 both end voltage raise, electric current increases, it is the gradient magnetic of 0.6T that field generator for magnetic 6 produces maximum magnetic induction, control magnetic fluid 3 and conductor fluid 4 actions, when 8ms, controlled circuit 8 is cut off, and field generator for magnetic 6 magnetic fields disappear, and conductor fluid 4 and magnetic fluid 3 recover original state, controlled circuit is switched on immediately, and begins to repeat to cut-off and conducting state.

Embodiment 8

A kind of self-recovery current limiting tripper such as embodiment 1 that utilizes conductor fluid and magnetic fluid.Selecting maximum magnetic induction in the present embodiment for use is that the electromagnet of 0.6T is as field generator for magnetic 6.

Shown in Fig. 1 and Fig. 3 (c); when using: switch 16 closures of adjunct circuit as the overload or short-circuit protection device; switch 15 disconnects; controlled circuit 8 electric currents are transferred to 35KA as short circuit current, thyristor assembly 17 conducting that is triggered, thus make adjunct circuit power supply 13 to field generator for magnetic 6 power supplies; it is the gradient magnetic of 0.6T that field generator for magnetic 6 produces maximum magnetic induction; control magnetic fluid 3 and conductor fluid 4 actions, when 20ms, controlled circuit 8 is cut off.Disconnect the switch 16 of adjunct circuit, adjunct circuit 14 is disconnected, and the magnetic field that field generator for magnetic 6 produces disappears, and conductor fluid 4 and magnetic fluid 3 restPose, and controlled circuit 8 is switched on again.

Shown in Fig. 1 and Fig. 3 (c), during as the on-load switch of control circuit break-make: switch 16 closures of adjunct circuit, switch 15 disconnects, and controlled circuit 8 electric currents are transferred to 30KA as the normal duty electric current, thyristor assembly 17 conducting that is not triggered, thus make adjunct circuit 14 be in the state of cut-offfing.The switch 15 of closed adjunct circuit, adjunct circuit 14 is switched on, and adjunct circuit power supply 13 is to field generator for magnetic 6 power supplies, it is the gradient magnetic of 0.6T that field generator for magnetic 6 produces maximum magnetic induction, control magnetic fluid 3 and liquid metal 4 actions, when 4ms, controlled circuit 8 is cut off.Disconnect the switch 16 or 15 of adjunct circuit, adjunct circuit 14 all can be disconnected, and the magnetic field that field generator for magnetic 6 produces disappears, and conductor fluid 4 and magnetic fluid 3 restPose, and controlled circuit 8 is switched on again.

Embodiment 9

A kind of self-recovery current limiting tripper that utilizes conductor fluid and magnetic fluid as shown in Figure 7, selecting maximum magnetic induction in the present embodiment for use is that the permanent magnet of 0.4T is as field generator for magnetic 6.Package casing 1 adopts ceramic material to make, solid state electrode terminal 2 forms single closed cavity, closed cavity size (length * wide * height) is 40mm * 20mm * 20mm, the MF03 type magnetic fluid 3 that adopts the refreshing right magnetic fluid technology Co., Ltd in Beijing to produce, and its density is 1320kg/m ³, saturation magnetization is 450GS, adopts the liquid metal gallium-indium-tin alloy as conductor fluid 4, according to proportioning, its density is decided to be 6378kg/m ³Liquid metal gallium-indium-tin alloy and magnetic fluid equal-volume are injected closed cavity respectively, magnetic fluid is last, gallium-indium-tin alloy is following, the cumulative volume of magnetic fluid and liquid metal gallium-indium-tin alloy accounts for 90% of closed cavity, the closed cavity remaining space is evacuated, and the relative vacuum degree is-100Kpa.Outside solid state electrode terminal 2 is chosen the long 10mm that is, diameter is the copper electrode of 5mm.Adopt motor driven machinery device, motor is connected as in the embodiment 1 described adjunct circuit.This experiment is at room temperature carried out.

Shown in Fig. 7 (a) and Fig. 7 (b); when using: controlled circuit 8 electric currents are transferred to 100A as short circuit current as the overload or short-circuit protection device; the conducting that is triggered of thyristor assembly; thereby make the power supply of adjunct circuit power supply motor; motor driven machinery device 26 moves to position shown in Fig. 7 (b) by slide rail 27 with permanent magnet 6; it is the body cavity lower right; the maximum magnetic induction that permanent magnet 6 produces is gradient magnetic control magnetic fluid 3 and conductor fluid 4 actions of 0.4T; when 10ms, controlled circuit 8 is cut off.Along slide rail 27 permanent magnet 6 is moved to position shown in Fig. 7 (a) by control motor driven machinery device 26, the magnetic field that permanent magnet 6 produces is to magnetic fluid and conductor fluid can't apply the magnetizing force effect or the magnetizing force effect is very faint, conductor fluid 4 and magnetic fluid 3 restPose, and controlled circuit 8 is switched on again.

Shown in Fig. 7 (a) and Fig. 7 (b), during as the on-load switch of control circuit break-make: give control command of motor, motor driven machinery device 26 moves to position shown in Fig. 7 (b) by slide rail 27 with permanent magnet 6, the maximum magnetic induction that permanent magnet 6 produces is gradient magnetic control magnetic fluid 3 and conductor fluid 4 actions of 0.4T, when 12ms, controlled circuit 8 is cut off.Along slide rail 27 permanent magnet 6 is moved to position shown in Fig. 7 (a) by control motor driven machinery device 26, the magnetic field that permanent magnet 6 produces is to magnetic fluid and conductor fluid can't apply the magnetizing force effect or the magnetizing force effect is very faint, conductor fluid 4 and magnetic fluid 3 restPose, and controlled circuit 8 is switched on again.

Embodiment 10

A kind of self-recovery current limiting tripper such as embodiment 1 that utilizes conductor fluid and magnetic fluid, difference from Example 1 is, the electromagnet that to select three identical maximum magnetic inductions in the present embodiment for use be 0.4T is connected in the adjunct circuit as 6, three electromagnet of field generator for magnetic.Package casing 1 adopts ceramic material to make, form six identical closed cavities with five dividing plates 23 and solid state electrode terminal 2, solid state electrode terminal 24, each closed cavity size (length * wide * height) is 30mm * 15mm * 15mm, the MF03 type magnetic fluid 3 that adopts the refreshing right magnetic fluid technology Co., Ltd in Beijing to produce, its density is 1320kg/m ³, saturation magnetization is 450GS, adopts the liquid metal gallium-indium-tin alloy as conductor fluid 4, according to proportioning, its density is decided to be 6378kg/m ³Liquid metal gallium-indium-tin alloy and magnetic fluid equal-volume are injected each closed cavity respectively, magnetic fluid is last, gallium-indium-tin alloy is following, the cumulative volume of magnetic fluid and liquid metal gallium-indium-tin alloy accounts for 90% of closed cavity, the closed cavity remaining space is evacuated, and the relative vacuum degree is-100Kpa.Outside solid state electrode terminal 2 is all chosen the long 10mm that is with inner solid state electrode terminal 24, diameter is the copper electrode of 5mm, six closed cavities of main body connect by inner solid state electrode terminal 24, and symmetrical in twos being placed on respectively on three field generator for magnetic 6, and this experiment is at room temperature carried out.

When using as the overload or short-circuit protection device; per two closed cavities action situation corresponding with electromagnet is shown in Fig. 1 and Fig. 3 (c): switch 16 closures of adjunct circuit; switch 15 disconnects; controlled circuit 8 electric currents are transferred to 150A as short circuit current; thyristor assembly 17 conducting that is triggered; thereby make adjunct circuit power supply 13 to field generator for magnetic 6 power supplies; it is the gradient magnetic of 0.4T that field generator for magnetic 6 produces maximum magnetic induction; control magnetic fluid 3 and conductor fluid 4 actions; when 5ms, controlled circuit 8 is cut off.For this device that six closed cavities are arranged, have six breakpoints and cut-off simultaneously, no arcing occurs in the experiment, and the effect that opens circuit is good.Disconnect the switch 16 of adjunct circuit, adjunct circuit 14 is disconnected, and the magnetic field that field generator for magnetic 6 produces disappears, and conductor fluid 4 and magnetic fluid 3 restPose, and controlled circuit 8 is switched on again.

During as the on-load switch of control circuit break-make, per two closed cavities action situation corresponding with electromagnet is shown in Fig. 1 and Fig. 3 (c): switch 16 closures of adjunct circuit, switch 15 disconnects, controlled circuit 8 electric currents are transferred to 120A as the normal duty electric current, thyristor assembly 17 conducting that is not triggered, thus make adjunct circuit 14 be in the state of cut-offfing.The switch 15 of closed adjunct circuit, adjunct circuit 14 is switched on, and adjunct circuit power supply 13 is to field generator for magnetic 6 power supplies, it is the gradient magnetic of 0.4T that field generator for magnetic 6 produces maximum magnetic induction, control magnetic fluid 3 and liquid metal 4 actions, when 4ms, controlled circuit 8 is cut off.For this device that six closed cavities are arranged, have six breakpoints and cut-off simultaneously, no arcing occurs in the experiment, and the effect that opens circuit is good.Disconnect the switch 16 or 15 of adjunct circuit, adjunct circuit 14 all can be disconnected, and the magnetic field that field generator for magnetic 6 produces disappears, and conductor fluid 4 and magnetic fluid 3 restPose, and controlled circuit 8 is switched on again.

Claims (10)

1, a kind of self-recovery current limiting tripper that utilizes conductor fluid and magnetic fluid comprises main body and accessory body two parts:

Main body comprises the outside solid state electrode terminal (2) of package casing (1) and package casing both sides, package casing (1) constitutes closed cavity with outside solid state electrode terminal (2), be filled with conductor fluid (4) and magnetic fluid (3) in the cavity by different level respectively, or be provided with at least one dividing plate (23) in the cavity, dividing plate (23) is provided with inner solid state electrode terminal (24), the volume of dividing plate (23) five equilibrium cavity is filled with conductor fluid (4) and magnetic fluid (3) by different level respectively in each cavity;

Accessory body comprises field generator for magnetic (6), fits together with main part, or fits together with mechanical device (26).

2,, it is characterized in that under each cavity of main body or arranged outside has temperature-adjusting device (5) according to the described device of claim 1.

3, according to the described device of claim 1, the quantity that it is characterized in that closed cavity is more than one device, field generator for magnetic (6) be arranged at least two the closed cavity or under, or be assembled between two closed cavities.

4, according to the described device of claim 1, it is characterized in that closed cavity quantity is one device, field generator for magnetic (6) is arranged on top, bottom or closed cavity one side of closed cavity.

5, according to the described device of claim 1, it is characterized in that mechanical device (26) is placed on the base (25) that is provided with slide rail (27), base (25) is assembled on the main part package casing (1).

6,, it is characterized in that inner solid state electrode terminal (24) or outside solid state electrode terminal (2) are communicated with conductor fluid (4) according to the described device of claim 1.

7,, it is characterized in that on the circuit of field generator for magnetic (6) place, being connected with neon tube, buzzer or LED display according to the described device of claim 1.

8, according to the described device of claim 1, it is characterized in that main part is connected with controlled circuit, field generator for magnetic is connected with a kind of and circuit of following four kinds of types of attachment,

First kind of form: field generator for magnetic is connected with controlled circuit,

Second kind of form: controlled circuit and field generator for magnetic place circuit constitute the former and deputy coil of transformer,

The third form: field generator for magnetic is connected in the adjunct circuit, adjunct circuit comprises any thyristor assembly that electric energy is provided and makes it produce the power supply in required magnetic field and connect into circuit to field generator for magnetic, be in series with a switch on the adjunct circuit major loop, thyristor assembly both sides are parallel with a switch

The 4th kind of form: field generator for magnetic and mechanical device fit together.

9, according to the described device of claim 1, it is characterized in that the device that first kind of form connects, the field generator for magnetic side is parallel with a potentiometer, second kind of device that form connects, field generator for magnetic is other to be parallel with a potentiometer, and field generator for magnetic place major loop is in series with a fixed value resistance.

10, according to the described device of claim 1, it is characterized in that this device is fitted in the following vizard of no-voltage protection device, two kinds of forms of second,

First kind form: this device is fitted in form separate on the structure with no-voltage protection device,

Second kind form: the common and field generator for magnetic of this device and no-voltage protection device is combined, no-voltage protection device is positioned on the field generator for magnetic, under or sidewall.

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