CN1245342A - Submersible transformer using device with circuit braker and fuse for self-protecting - Google Patents
Submersible transformer using device with circuit braker and fuse for self-protecting Download PDFInfo
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- CN1245342A CN1245342A CN 99117729 CN99117729A CN1245342A CN 1245342 A CN1245342 A CN 1245342A CN 99117729 CN99117729 CN 99117729 CN 99117729 A CN99117729 A CN 99117729A CN 1245342 A CN1245342 A CN 1245342A
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- fuse
- circuit
- transformer
- circuit breaker
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/1081—Modifications for selective or back-up protection; Correlation between feeder and branch circuit breaker
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/0241—Structural association of a fuse and another component or apparatus
- H01H2085/0291—Structural association with a current transformer
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Gas-Insulated Switchgears (AREA)
- Fuses (AREA)
- Regulation Of General Use Transformers (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The triphase transformer (1) is immersed in a tub (4) with dielectric gas (5). An isolating cross section (7) holds fuses (11) in place (12). The fuses are series connected for each circuit transformer between the windings and isolating section. Each pole has contact units connected to a circuit breaker (15).
Description
The present invention relates to a kind of piezoelectric transformer, its winding and magnetic circuit are immersed in the dielectric fluid or gas that is contained in the case, and are provided with protective device, and the design of this protective device is used for the bad influence of limiting transformer internal work.
Document FR-A-2; 712; 730 have described such three-phase transformer that is immersed in the fuel tank; its protective device comprises: every phase all has the protection fuse between each power supply phase and the corresponding elementary winding of transformer, and is positioned at the fuse three-phase disconnect alternate with corresponding transformer.Trip gear is opened disconnect according to the signal of transducer.This sensor sensing is represented the variation of at least one parameter of dielectric fluid character.The parameter of measuring is a dielectric pressure, and it has constituted the bad indication of the inner local work of transformer circuit, for example, and the contact pilotage point failure of winding electric insulation, and this can worsen and becomes focus, this situation shows as the very low overcurrent of elementary winding supply of current.The design fuse reduces the destruction that transformer internal impedance fault causes, and comprises that resistance declines to a great extent.For best protection is provided, at every fuse that two series connection are housed at least of going up mutually, have the cutout threshold that staggers: the time constant of a fuse is very little, to surpassing the extra-high-speed electric current sensitivity of 6 times of transformer rated current; The time constant of another fuse is bigger, is sensitive to the overload of corresponding 3～5 times of rated current.This component design becomes, if its work so, is only ad hoc taken case apart by the professional and just can have been rebulid power supply to interrupt the power supply of primary winding.Why disconnect set again that Here it is, and to be immersed in reason in the case together with fuse.The structure of above-mentioned consideration derives from so a kind of idea: the certain corresponding transformer internal work of any dropout of protective device is bad, and can not be outside accident.Because the external fault that takes place, especially in load-side equipment, and remove to keep in repair intact transformer, this is actually and can't makes us accepting.So,, will provide some devices to select for the electric fault of transformer outside.Experience shows that in practice, the fuse of protective device has danger, the especially fuse of unexpected fusing to be operated in low overcurrent scope.In addition, when little overcurrent, for example be lower than 3 times the specified intensity of power transformation device slightly, the fuse of the submergence of the low fusion current of protective device causes unallowed temperature rise in the environment of its submergence, but can not melt and interruptive current.So produced serious inefficacy, and disagreed with the original intention that fuse is installed.Moreover the fuse heating makes it aging prematurely, and has As time goes on increased the bad danger of working.
Document EP-A-0,468,299 have also described a kind of three-phase transformer that is immersed in the oil, and each elementary phase all is associated with protective device, this protective device comprises: the single-phase circuit breaker of the relevant elementary phase winding of coupled in series, and this circuit breaker is by the overlond trip device that flows through electric current sensitivity is wherein controlled; And rated current intensity is the specified phase current intensity of transformer more than 5 times at least, preferably the fuse more than 10 or 20 times.This specification is limited in the primary short of transformer with the working range of fuse, and comprises because other electric accidents such as elementary overcurrent that the transformer secondary short circuit causes are considered by circuit breaker.The existence of fuse can be selected the low thereby cheap circuit device of performance, especially the lower circuit breaker of breaking capacity.
Yet this device is installed in outside the transformer, causes the big and on-the-spot complexity of installing of overall dimensions.Especially, between the connector of the line side of circuit breaker and load-side, leave very big air bypass distance,, can in circuit breaker, flow through very large electric current because when primary short takes place.The a large amount of connector in transformer tank outside is difficult to its insulation of control, thereby has produced other inefficacy danger.
The following fact has further been given prominence to this problem, and promptly this device is for the short circuit in fuse line side, and the short circuit that especially is electrically connected generation between circuit breaker and fuse is inoperative.In fact fuse is connected in series between circuit breaker and the transformer, and the current sensor of control circuit breaker tripping is positioned at the load-side of fuse.Fault current when being short-circuited between circuit breaker and fuse flows through circuit breaker, and its intensity surpasses interrupting capacity, makes the circuit breaker can not interrupt circuit.This fault causes disconnecting on the level of power-supply system line side node, has damaged overall utilization rate.
In addition, this device can not make three circuit breakers that are connected to each phase of primary thread off simultaneously.So, in some cases because the part dropout takes place in fault, and in not disconnecting mutually, Leakage Current being arranged, it is lower than circuit breaker throws off electric current or has produced big delay and just disconnect, and is harmful to primary circuit (danger of blast) and/or entire equipment (can not select the power supply substation).
Document US-A-4,323,871 have described a kind of circuit brake, are not exclusively used in the protection of transformer, and it comprises circuit-breaker and fuse, and whole system is immersed in the case of filling oil.Circuit breaker design is used for interrupting low fault current, and broken height fault current in the fuse.The single-phase pattern of this circuit-breaker comprises a traditional vacuum box, has the trigger device of static contact head device and translation on the cylinder of box.Trigger device comprises a bar, dynamically is connected on the switching mechanism of opening spring.This mechanism comprises an action bars, is used for manually disconnecting and closure by casing, also comprises the lock of opening of a cam-shaped, is shifted onto resting position flexibly.Have the U-shaped trip gear and the cam co-operation of bimetal leaf, cam is remained on the service position, at this moment, switching mechanism is locked in make position.The electric current of box of flowing through flows through bimetal leaf.The electric current in case break down, bimetal leaf bending and release cam are decontroled then to act on and are opened opening ratchet and switching mechanism is opened on the spring.Three single-phase circuit breakers are got up to draw three-phase breaker side by side.These single-phase switch mechanisms mechanically are joined to one another, and are to open the ratchet place on the one hand, are at the operating lever place on the one hand, thereby have formed at electric fault and the manual single institution of three utmost points of switch disconnector simultaneously or almost simultaneously during control.In these devices, the bimetal leaf of each phase is connected in series between sleeve pipe and the corresponding vacuum box, and phase current flows through bimetal leaf.Because bimetal leaf has constituted the moving-conductor without protection in the direct immersion oil, so extra electric fault danger is introduced in being provided with of bimetal leaf.In addition, because reasons in structure, bimetal leaf is placed directly in the upstream or the downstream of the circuit breaker of its control.Therefore, can't consider short circuit between sleeve pipe place or sleeve pipe and the circuit breaker.
The objective of the invention is to overcome the shortcoming of prior art; particularly, when hanging down overcurrent, still effectively prevent harmful danger of melting takes place in the device for fusing with Global Macros low-cost and realization high safety in the volume of traditional subway transformer case.
More generally, the objective of the invention is to propose the transformer of a kind of low cost, small size, it has the reliable Global Macros device of operation, can handle the fault at internal fault and secondary terminal place.We recall again, and the handling safety of system requires to be to consider following situation simultaneously: system safety promptly prevents the ability that unexpected incidents take place; Itself reliability, the possibility that promptly in preset time, did not lose efficacy; Validity is promptly in the possibility of given time work; Depend on the reliability and the maintenanceability of system, maintenanceability is the possibility that system keeps in repair in given interval.Under this concrete situation, safety requirements is meant that all internal transformer faults that can cause the case blast make transformer disconnect from circuit.Reliability requirement is meant that particularly the existence of protective device itself can not produce any extra inefficacy danger.Validity and maintenanceability require to be meant at processing requirements carries out to transformer that the internal fault of major repair and processing occur on the secondary circuit of transformer outside and maintenance must be reduced to minimum fault the time, good selectivity.
According to a first aspect of the invention, these purposes realize that by a kind of three-phase electricity transformer it comprises:
The case of liquid or gas dielectric is housed;
Three-phase primary circuit and three-phase secondary circuit, the two includes the winding that is immersed in the dielectric, and each of primary circuit enters in the case through the insulation sleeve pipe;
Protective device comprises:
At least two fuses that are immersed in the dielectric are connected in series between insulating sleeve and the primary circuit winding on mutually at the primary circuit, have enough breaking capacities, when three-phase shortcircuit appears in primary circuit, disconnecting corresponding phase,
Multipole circuit breaker, for each phase that a fuse is housed, comprise electrode, be immersed in the dielectric, be connected in series between corresponding fuse and the winding on mutually described, each electrode comprises contact apparatus, relatively get contact position and disconnected position, can guarantee that at contact position electric current passes through, this circuit breaker also comprises the opening mechanism that all electrodes are shared, design is used for contact apparatus is moved on to disconnected position from contact position
Trip gear links to each other with the opening mechanism of circuit breaker, comprises overload release,
Fuse, circuit breaker and trip gear are connected like this, and promptly under the condition corresponding to the place's short circuit of secondary circuit terminal, the contact apparatus of circuit breaker separates and interruptive current, and fuse does not begin fusing; The current strength that flows to each fuse has a threshold values, and this threshold values is lower than the breaking capacity of circuit breaker respective electrode, is higher than this threshold values, sends before order that contact apparatus separates can make contact separately the fuse fusing at overload release.
According to second aspect present invention, above-mentioned purpose realizes that by the single-phase electricity transformer it comprises:
The case of liquid or gas dielectric is housed;
Primary circuit and secondary circuit all contain the one or more windings that are immersed in the dielectric, primary circuit through the insulation sleeve pipe enter in the case;
Protective device comprises:
At least one is immersed in the fuse in the dielectric, is connected in series between insulating sleeve and the one or more windings of primary circuit on mutually at the primary circuit, has enough breaking capacities, can disconnect corresponding phase when the primary circuit short circuit,
Circuit breaker comprises the electrode that is immersed in the dielectric, is connected in series between fuse and winding, it has contact apparatus, contact position and disconnected position that the card electric current of going bail for relatively flows through, and circuit breaker also comprises an opening mechanism, design is used for contact apparatus is moved to disconnected position from contact position
Trip gear links with the circuit breaker opening mechanism, comprises an overload release,
Fuse, circuit breaker and trip gear connect like this, and promptly under the condition of the corresponding secondary circuit short-circuit of terminals, the contact apparatus of circuit breaker separates and interruptive current, and fuse does not begin fusing; The current strength that flows into fuse has threshold values, and this threshold values is lower than the breaking capacity of corresponding breaker electrode, on this threshold values, and at contact apparatus that overload release sends before separately order can make contact separately, the fuse fusing.
Following development more specifically concentrates on the three-phase assembly, unless otherwise indicated, also is used for single-phase transformer.
Use circuit breaker can when secondary circuit breaks down, limit ineffectivity in the protective device.After having eliminated failure cause, only need close circuit breaker again, this operation only need be carried out shirtsleeve operation at the scene, if circuit breaker is furnished with electric closed remote control, can also realize by remote control.Open the danger that all electrodes of circuit breaker can avoid transformer portion to disconnect simultaneously, the disconnection of promptly not enough quantity phase, and make the current loop closure of a primary circuit.
Because breaker electrode and fuse are immersed in the box of the circuit breaker, factory dress unit can be provided, reduce on-the-spot installation, and reduced the inefficacy danger that protective device produces significantly.The structure in circuit breaker fuse line side can be used circuit breaker and the electric fault introduced obtains handling.
Opening mechanism partly immerses provides anticorrosive protection and lubricated, from aging viewpoint, is favourable like this.Therefore improved whole reliability.
The very little electrode of energy installation dimension because circuit breaker requires low opening performance, owing to being immersed in the dielectric, has reduced the bypass distance of circuit breaker, i.e. distance between line side and load-side connector on the one hand on the other hand.
Consider three-phase transformer particularly; should note; fuse can be contained in each ideally with breaker electrode and go up mutually; but; if relative transformer frequency response protective device line side loses selectivity and can allow when earth fault; can have only in the two-phase of three-phase fuse and breaker electrode are set, it enough interrupts the electric current in the whole primary circuit, and has reduced cost.
Preferably, overload release comprises that at least one measurement flows to the device of the current strength of primary circuit phase.In fact, this transducer is a current transformer.This structure can guard box in phase, between be positioned at the short circuit of the position between fuse and circuit breaker respective electrode, can be found by trip gear and realize that transformer separates fully.Short circuit meeting wherein causes the fuse fusing.Especially preferably, the electric current of position, fuse line side is flow through in the measurement mechanism measurement, is preferably in outside the case line side of sleeve pipe.So guaranteed the case internal fault, comprise the sleeve pipe place or with the fault of the junction of fuse, can find by transducer, and cause circuit breaker to be opened.For the situation that prevents to thread off, point out to try one's best and select measurement point near sleeve pipe owing to the outer fault of case.A particularly advantageous selection is that the current transformer solenoid is placed on the part of sleeve pipe outside case, or its close vicinity.
According to preferred embodiment, fuse or a plurality of fuse are elongate, two conducting end are designed for the line side are connected the sleeve pipe side and load-side is connected the circuit breaker side, be positioned at each side at the middle part of outer surface insulation, for each phase of being furnished with fuse, the electric-conductor between insulating sleeve and fuse middle part insulated outer surface is by insulation ground encapsulation fully.Electric joint between sleeve pipe and fuse in fact just is not subjected to the installation site that fuse and circuit breaker connect protection.Therefore, with regard to the safety of equipment, this is a weak spot.Thus, insulation provides the good assurance of not breaking down fully.Another scheme is, fuse or a plurality of fuse are elongate, two conducting end are designed for the line side are connected the sleeve pipe side and load-side is connected the circuit breaker side, be positioned at each side of middle part that outer surface is made of insulator, for each phase of being furnished with fuse, fuse has constituted single-piece sub-component with well, the part that the outer surface of this sub-component is positioned at case comprises sleeve pipe, line side conducting end and fuse middle part, is made of one or more complete insulators of insulation fully that do not have interruption that form.So, eliminated any danger of fuse line side primary short in the case, and the danger that causes the fault of case blast.
For strengthening the protection of internal fault, preferably trip gear also comprises release, and when on behalf of the parameter of described dielectric state, at least one surpass the threshold values of setting, circuit breaker was opened in order.In fact, can obtain the different physical parameter of dielectric state: the liquid level in fluid pressure, temperature, the case, and the existence of gas in case, this make dielectric or fully the gas breakdown of insulator be detected the low energy electric arc by turn-to-turn in the Transformer Winding for example.Preferably, some feature according to secondary circuit (secondary current) or primary circuit (fusings of one or more fuses) provides the dropout of circuit breaker.
Be used in combination as the alternative of current sensor on the primary or with it, overload release comprises at least one measurement mechanism, is used to measure the current strength of inflow transformer secondary circuit phase.Because possible saturated of transformer magnetic circuit can not always extract circuit breaker tripping information satisfactorily from primary circuit.In the reality, one or more branch roads of current sensor secondary circuit can be set, preferably each phase and center line (if any).According to an embodiment, two current measuring devices also with the differential protection of transformer.For example, document FR-A-214 has introduced such device in 771, and this is hereby incorporated by reference the document on the one hand.
Preferably, fuse, circuit breaker and trip gear connect like this, if i.e. fuse or fuse fusing, then trip gear sends separately instruction of contact apparatus.The current strength value has a scope, the contact of breaker electrode separates after at least one fuse fusing in this scope, these current strength values are the value above the intensity threshold values, and on the intensity threshold values time, before the separately instruction of the contact apparatus that trip gear sends can make contact separately, fuse melted fully.Elementary phase current intensity level also has a scope, and for this scope, the priority that the fuse fusing separates with contact is inessential, and these values are included in corresponding between the value of secondary short circuited and the previously defined threshold values.In this scope, in fact fault current is lower than the circuit breaker breaking capacity, even is lower than the fuse interrupting capacity.
Fuse is current limliting preferably.Can guarantee that like this electric current that flows into primary circuit at fuse between melting stage remains on the size of permission.
According to a kind of particularly advantageous mode, each breaker electrode comprises a vacuum box that is immersed in the dielectric.Consider and use fuse when the high strength short circuit current takes place, to protect, can utilize small-sized low performance vacuum box.The bypass distance of vacuum box is little, and promptly the distance between the line side of box and the load-side connector is short, thereby can not produce other problem, because connector is immersed in the oil, can provide good electric insulation.So vacuum box provides one very advantageously taking into account scheme aspect size, performance and the cost.
Preferably, circuit breaker comprises: close mechanism, and design is used for contact apparatus is moved on to contact position from disconnected position, and it has the operating means that touches from the case external enwergy; Opening mechanism, design is used for opening breaker electrode, and no matter close mechanism is any state.So, if, transformer is resumed work, and does not need to open case owing to transformer outside reason has caused dropout.If open under the preferential situation that fault still exists when closure, can prevent from transformer is caused damage.
Can make other advantages of the present invention and feature clearer to the description of different embodiments of the invention below, these embodiment are as non-limiting example, and expression is in the accompanying drawings:
Fig. 1 is the line map according to the transformer of first embodiment of the invention;
Fig. 2 is the cutaway view according to the structure of first embodiment of the invention;
Fig. 3 is perpendicular to the cutaway view on Fig. 1 plane;
Fig. 4 illustrates the circuit breaker of transformer and the curve of fuse time-current characteristics;
Fig. 5 is the schematic diagram according to the transformer element of second embodiment of the invention;
Fig. 6 is the line map of third embodiment of the invention;
Fig. 7 is the schematic diagram according to the transformer element of fourth embodiment of the invention.
Referring to Fig. 1～3, the middle low-voltage transformer 1 of three-phase comprises elementary winding 2 and the secondary winding 3 that is immersed in the case 4, and dielectric fluid 5 is housed in the case 4, can be oil.The multifunction piece 6 of each of primary circuit through containing medium-tension bushing 7 puts in the case 4.
Multifunction piece 6 comprises special insertion district 8 on its case 4 exterior portion, and comprises head 10 region of engagements 9 of fuse 11 in its case 4 on the part.Fuse 11 is a kind of traditional limiting fuses, and it is the body 12 of column and insulation that its middle part has constituted outer wall, also has two metal end, head 10 and root 13.Region of engagement 9 comprises the outer tubular wall of being made by electric insulation bullet glue material, and its bottom cooperates with the body 12 of fuse 11, realizes the sealing of 5 of fuse head 10 and oil.Sealing is realized with insertion district 8 in the top of tubular wall.Like this, the multifunction piece 6 that fuse 11 is housed has constituted one-piece assemblies, and its outer wall has formed integral insulation, does not interrupt at 12 at the middle part of sleeve pipe 7 and fuse 11.Therefore, guaranteed that the electric fault of fuse 11 line sides generations is in fact in the outside of case 4, so case can not produce the danger of blast.
The other end of fuse 11 is through there being the electrical connector 16 of armouring electric conductor to be connected on the mains side lug plate 14 of breaker module 15.
For each phase, breaker module 15 comprises the vacuum box 17 of traditional structure, and its body 18 has constituted a cylindrical cavity, the trigger device 20 that the inside is equipped with static contact head device 19 and is guided vertically in box, and trigger device 20 extends and becomes control lever 21.Such box is at for example document US-A-4, is described in 323,871, and this respect of the document is hereby incorporated by reference.The switching mechanism 22 of this circuit breaker also is document US-A-4, and that describe in 323,871 is a kind of, and wherein the content of this respect is hereby incorporated by reference.This mechanism 22 is furnished with the operating lever 23 that can touch outside case 4, and open and close manually.
The load-side splicing ear 24 of breaker module 15 is connected to the elementary winding 2 of transformer 1 through tap changer 25.This tap changer is document US-A-4 for example, the type of describing in 504,811, and wherein this part content is hereby incorporated by reference.Tap changer has fixing lug plate and operation strip, and the former separates the difference of elementary winding, and the latter supports the tie point of circuit breaker load-side splicing ear.For elementary each phase, operation strip mobile can be simultaneously circuit breaker load-side splicing ear optionally be connected to correspondence in the point that separates of elementary winding.
Case 4 is airtight or almost is that airtight (latter has comprised that case for example has the situation of small size gas drying tube) height of liquid level is to enable submergence region of engagement 9, fuse 11, vacuum box 17, and the moving part of mechanism 22 except that operating lever 23 of circuit breaker 15.
Near case 4 outside medium-tension bushings 7, be provided with the solenoid 26 of measuring transformer 27.Measuring transformer 27 is measured the current strength that flows into sleeve pipe.Overload release 28 received signals are also controlled the switching mechanism 22 of breaker module 15.
The behavior of this device can be seen from the time current curve of Fig. 4.Following content is drawn in the drawings, and wherein Y-axis is the time, and X-axis is a phase current intensity, shows the fusion curve 41 of circuit breaker tripping curve 40 and corresponding fuse mutually.
For rated current I
N, circuit breaker allows overload I
S, and can not thread off.Circuit breaker tripping curve 40 is from I
SPlay deflection, when correspondence the transformer secondary output three-phase shortcircuit, flow into the threshold values I of the current strength of elementary phase
CCBT, circuit breaker has short drop-away time, is 0.1 second in this example.In this section zone, fuse fusion curve 41 is positioned at circuit breaker break-off diagram top, because just can melt after 3 seconds under this electric current.In practice, this is expressed as, and when the transformer secondary output short circuit took place, the circuit breaker of accepting the overload relay instruction disconnected the electric current of primary before the remarkable heating of fuse.
Surpass threshold values I
CCBTAfter, a threshold values I who is lower than the circuit breaker breaking capacity is arranged
F, at this moment, circuit breaker tripping curve 40 and fuse fusion curve 41 intersect.This means, its intensity of electric current that causes if the primary circuit is short-circuited at least one mutually in greater than I
F, so, before the dropout instruction of release 28 was delivered to circuit breaker 15, the fuse 11 under this electric current had melted.But a current sensor 27 can become aware of short circuit current and flow through, and release 28 is opened circuit breaker 15 subsequently.This structure can guarantee whole primary circuit insulation, even short circuit current has only melted a fuse 11.
Other dropout pattern of circuit breaker is ranked.Specifically, the one or more transducers 29 that are connected to release 30 are provided, the state of data represented dielectric wherein.At the liquid dielectric in this case, these data comprise, for example, have the measurement of gas in the case in liquid level, temperature, pressure or the case.
According to second embodiment, see Fig. 5, the multi-functional sub-component 50 of single-piece comprises, middle voltage connector 51, flexible electrical connector 52, sleeve pipe 53 and fuse head installed part 54.Flexible connecting member 52 includes the core 55 of metal braid or Thin cable.Sub-component comprises the molded external coating of being made by insulation bullet glue material 56.Flange 57 is used for being installed to case 4.So just obtained electric insulation, and between the middle part of fuse 11 and the middle pressure connector 51 outside the case, do not interrupted.It is to have removed connector with the medium voltage switchgear equipment of mains side that the previous relatively example of this device also has an advantage.
As represent the shown in Figure 6 of line map that the present invention the 3rd implements, identical principle also is used for single-phase.At this moment current sensor just is enough to finish the control to circuit breaker.
The 4th embodiment shown in Figure 7 mainly sleeve structure with each mutually the configuration aspects of fuse line side connector be different from first embodiment.Sleeve pipe is connected to the head connector of current limiting fuse 8 through the electrical connector 58 that is made of armored conductor.This structure is owing to reduced the quantity of parts peculiar, and performance is low, but cost is few.
Above each embodiment be used for pressure, low-tension transformer field.The present invention also can be used for the transformer of other types, voltage source transformer in being particularly useful for.Primary can be that triangle connects or Y-connection.Under the latter instance, current sensor is installed on middle thread casing, and to control overload device be useful.
In addition, can expect the circuit breaker of the other types except vacuum circuit-breaker.The present invention also can use gas dielectric, particularly SF
6
Claims (12)
1. a three-phase electricity transformer (1) comprising:
The case (4) of liquid or gas dielectric (5) is housed;
Three-phase primary circuit and three-phase secondary circuit, the two includes the winding (2,3) that is immersed in the dielectric, and each of primary circuit enters in the case (4) through insulation sleeve pipe (7);
Protective device comprises:
At least two fuses (11) that are immersed in the dielectric (5), each is connected in series between insulating sleeve (7) and the primary circuit winding (2) on mutually at transformer (1) primary circuit, have enough breaking capacities, and when three-phase shortcircuit appears in primary circuit, can disconnect corresponding phase
Multipole circuit breaker (15), for each phase that a fuse (11) is housed, comprise electrode, be immersed in the dielectric (5), be connected in series between corresponding fuse (11) and the winding (2) on mutually described, each electrode comprises contact apparatus (19,20), relatively get contact position and disconnected position, can guarantee that at contact position electric current passes through, this circuit breaker (15) also comprises the shared opening mechanism of all electrodes (22), and design is used for contact apparatus (19,20) move on to disconnected position from contact position
Trip gear (28,30) links to each other with the opening mechanism (22) of circuit breaker (15), comprises overload release (28),
Fuse (11), circuit breaker (15) and trip gear (28,30) connect like this, and promptly under the condition corresponding to the place's short circuit of secondary circuit terminal, the contact apparatus (19,20) of circuit breaker (15) separates and interruptive current, and fuse (11) does not begin fusing; The current strength that flows to each fuse has a threshold values, and this threshold values is lower than the breaking capacity of circuit breaker (15) respective electrode, is higher than this threshold values, send contact apparatus (19 at overload release (28), 20) before the order that separates can make contact apparatus (19,20) separately, fuse (11) fusing.
2. a single-phase electricity transformer (1), it comprises:
The case (4) of liquid or gas dielectric (5) is housed;
Primary circuit and secondary circuit all contain the one or more windings (2,3) that are immersed in the dielectric (5), primary circuit through the insulation sleeve pipe (7) enter in the case (4);
Protective device comprises:
At least one is immersed in the fuse (11) in the dielectric (5), be connected in series between insulating sleeve (7) and the one or more windings of primary circuit (2) on mutually at transformer (1) primary circuit, have enough breaking capacities, when the primary circuit short circuit, can disconnect corresponding phase
Circuit breaker (15), comprise the electrode that is immersed in the dielectric (5), be connected in series between fuse (11) and primary circuit winding (2), it has contact apparatus (19,20), contact position and disconnected position that the card electric current of relatively going bail for flows through, circuit breaker (15) also comprises an opening mechanism (22), design is used for contact apparatus (19,20) is moved to disconnected position from contact position
Trip gear (28,30) links with circuit breaker (15) opening mechanism (22), comprises an overload release (28),
Fuse (11), circuit breaker (15) and trip gear (28,30) connect like this, and promptly under the condition of the corresponding secondary circuit short-circuit of terminals, the contact apparatus (19,20) of circuit breaker (15) separates and interruptive current, and fuse (11) does not begin fusing; The current strength that flows into fuse (11) has threshold values, this threshold values is lower than the breaking capacity of corresponding circuit breaker (15) electrode, on this threshold values, the contact apparatus (19 that sends at overload release (28), 20) separately order can make contact apparatus (19,20) separately before, fuse (11) fusing.
3. as the transformer of claim 1 or 2, it is characterized in that overload release (28) comprises that at least one is used for measuring the measurement mechanism (27) of the current strength that flows to transformer (1) primary circuit phase.
4. transformer as claimed in claim 3 is characterized in that, measurement mechanism (27) is measured the electric current that flows through fuse (11) position, line side, is preferably in outside the case (4) line side of sleeve pipe (7).
5. the described transformer of arbitrary as described above claim, it is characterized in that, fuse or a plurality of fuse (11) are elongate, two conducting end (10,13) be designed for the line side is connected sleeve pipe (7) side and load-side is connected circuit breaker (15) side, be positioned at each side at the middle part (12) of outer surface insulation,, be positioned at the electric-conductor quilt insulation ground encapsulation fully between (12) insulated outer surface of insulating sleeve (7) and fuse middle part for each phase of being furnished with fuse (11).
6. the described transformer of arbitrary as described above claim, it is characterized in that, fuse or a plurality of fuse (11) are elongate, two conducting end (10,13) be designed for the line side is connected sleeve pipe (7) side and load-side is connected circuit breaker (15) side, be positioned at each side of middle part (12) that outer surface is made of insulator, for each phase of being furnished with fuse (11), fuse (11) has constituted the single-piece sub-component of band sleeve pipe (7), the part that the outer surface of this sub-component is positioned at case (4) comprises sleeve pipe (7), line side conducting end (10) and fuse (11) middle part (12) are made of one or more complete insulators of insulation fully that do not have interruption that form.
7. the described transformer of arbitrary as described above claim is characterized in that trip gear (28,30) also comprises release (30), and when on behalf of the parameter of described dielectric state, at least one surpass the threshold values of setting, circuit breaker was opened in order.
8. the described transformer of arbitrary as described above claim is characterized in that overload release (28) comprises at least one measurement mechanism, is used to measure the current strength of inflow transformer secondary circuit phase.
9. the described transformer of arbitrary as described above claim is characterized in that, fuse (11), circuit breaker (15) and trip gear (28,30) connect like this, if i.e. fuse or fuse fusing, then trip gear (28,30) sends separately instruction of contact apparatus.
10. the described transformer of arbitrary as described above claim is characterized in that, fuse (11) is a current limliting.
11. the described transformer of arbitrary as described above claim is characterized in that, each breaker electrode comprises a vacuum box (17) that is immersed in the dielectric (5).
12. the described transformer of arbitrary as described above claim, it is characterized in that circuit breaker (15) comprising: close mechanism (22), design is used for a contact apparatus (19,20) move on to contact position from disconnected position, it has the operating means (23) that touches from case (4) external enwergy; Opening mechanism (22), design is used for opening breaker electrode, and no matter close mechanism (22) is any state.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9810519A FR2782409B1 (en) | 1998-08-14 | 1998-08-14 | UNDERWATER TRANSFORMER SELF-PROTECTED BY A DEVICE INCLUDING A CIRCUIT BREAKER AND FUSES |
| FR9810519 | 1998-08-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1245342A true CN1245342A (en) | 2000-02-23 |
| CN1206670C CN1206670C (en) | 2005-06-15 |
Family
ID=9529752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99117729 Expired - Fee Related CN1206670C (en) | 1998-08-14 | 1999-08-12 | Submersible transformer using device with circuit braker and fuse for self-protecting |
Country Status (11)
| Country | Link |
|---|---|
| EP (1) | EP0981140B1 (en) |
| CN (1) | CN1206670C (en) |
| AR (1) | AR021200A1 (en) |
| AU (1) | AU753147B2 (en) |
| BR (1) | BR9903587A (en) |
| DE (1) | DE69914420T2 (en) |
| EA (1) | EA002377B1 (en) |
| ES (1) | ES2213999T3 (en) |
| FR (1) | FR2782409B1 (en) |
| ID (1) | ID23712A (en) |
| NO (1) | NO320723B1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100391074C (en) * | 2001-10-22 | 2008-05-28 | 阿勒瓦T&D股份有限公司 | Protection system for protecting three-phase distributing transformer with liquip-dielectric insulating and including phase isolating switch |
| CN101292406B (en) * | 2005-08-24 | 2012-08-22 | 立维腾制造有限公司 | Circuit interrupting device with automatic test |
| CN101051735B (en) * | 2006-01-09 | 2012-08-22 | 弗洛雷斯·罗沙达·路易斯·冈萨罗 | Electric distribution network electrical equipment |
| CN110415953A (en) * | 2018-04-27 | 2019-11-05 | 欧玛嘉宝公司技术经济利益集团 | High voltage electric equipment with the device for limiting magnetizing current |
| CN111477523A (en) * | 2020-04-14 | 2020-07-31 | 阳光电源股份有限公司 | Combined fuse, application device thereof and protection method of application device |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2784245B1 (en) * | 1998-10-01 | 2000-11-24 | Schneider Electric Ind Sa | MONOBLOCK MULTIFUNCTIONAL HIGH-VOLTAGE ELECTRICAL LINK, COMPRISING A FUSE AND CONNECTION INTERFACE, AND PROTECTION DEVICE COMPRISING SUCH AN ELECTRICAL LINK |
| FR2822601B1 (en) * | 2001-03-21 | 2004-12-24 | Transfix Toulon Soc Nouv | SCALABLE TRANSFORMATION STATION FOR ARTERY-LOWER NETWORKS |
| FR2826173B1 (en) * | 2001-06-15 | 2003-08-15 | Schneider Electric Ind Sa | DISTRIBUTION TRANSFORMER SELF-PROTECTED BY A CIRCUIT BREAKER ON SECONDARY SHORT CIRCUIT |
| ES2212747B1 (en) * | 2003-01-14 | 2005-06-01 | Grupo Ormazabal, S.A. | TRANSFORMATION CENTER FOR SELF-PROTECTED TRANSFORMER. |
| EP2075807B1 (en) | 2007-12-28 | 2014-09-17 | Constructora de Transformadores de Distribucion Cotradis, S.L.U. | Electrical equipment for distribution network with fault detection, disconnection and elimination system |
| US20110255199A1 (en) * | 2010-04-16 | 2011-10-20 | General Electric Company | Arc flash hazard reduction for transformer secondaries |
| FR3088475B1 (en) * | 2018-11-08 | 2022-11-25 | Thales Sa | System for detecting and limiting the effects of insulation loss of an electrical transformer |
| EP4195226A1 (en) * | 2021-12-13 | 2023-06-14 | Abb Schweiz Ag | A subsea substation system |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1162262A (en) * | 1956-10-24 | 1958-09-10 | Merlin Gerin | Protection of installations against short circuits |
| US3210604A (en) * | 1962-08-27 | 1965-10-05 | Rt & E Corp | Electrical system and method of establishing same |
| US3292048A (en) * | 1964-10-20 | 1966-12-13 | Mc Graw Edison Co | Protected electrical transformer |
| SU377895A1 (en) * | 1967-07-15 | 1973-04-17 | Северо Западное отделение Всесоюзного государственного проектно изыскательского , научно исследовательского института Энергосетьпроект , Ленинградский ордена Ленина политехнический институт М. И. Калинина | DEVICE FOR POWER SUPPLY |
| US3599135A (en) * | 1970-01-12 | 1971-08-10 | Ite Imperial Corp | Circuit protection arrangement including coordinated operation of a circuit breaker and a current limiting fuse |
| US3666992A (en) * | 1970-10-22 | 1972-05-30 | Allis Chalmers Mfg Co | Protective means for distribution transformer |
| AU5007379A (en) * | 1978-09-08 | 1980-03-13 | Westinghouse Electric Corporation | Thermally sensitive protective device for transformer |
| DE3343424A1 (en) * | 1983-12-01 | 1985-06-13 | Felten & Guilleaume Energietechnik GmbH, 5000 Köln | Protection device for transformer outputs in the medium-voltage range |
| US4743996A (en) * | 1986-05-22 | 1988-05-10 | Westinghouse Electric Corp. | Electrical distribution apparatus having fused draw-out surge arrester |
| DE4023237A1 (en) * | 1990-04-14 | 1991-10-17 | Sachsenwerk Ag | SWITCHING DEVICE WITH A LOAD SWITCH OR SWITCH DISCONNECTOR AND A FUSE |
| DE4023238A1 (en) * | 1990-07-21 | 1992-01-23 | Sachsenwerk Ag | CIRCUIT ARRANGEMENT WITH A TRANSFORMER |
| FR2712730B1 (en) * | 1993-11-15 | 1995-12-29 | France Transfo Sa | Protected submerged electric transformer. |
| JPH07255122A (en) * | 1994-03-15 | 1995-10-03 | Hitachi Ltd | Overcurrent protective circuit |
| JPH0819173A (en) * | 1994-06-24 | 1996-01-19 | Kansai Electric Power Co Inc:The | Spot-network receiving installation |
| FR2750809B1 (en) * | 1996-07-02 | 1998-10-30 | Transfix Soc Nouv | PROTECTION DEVICE AGAINST THE EFFECTS OF INTERNAL FAULTS OF AN ELECTRICAL DEVICE |
-
1998
- 1998-08-14 FR FR9810519A patent/FR2782409B1/en not_active Expired - Fee Related
-
1999
- 1999-07-26 DE DE1999614420 patent/DE69914420T2/en not_active Expired - Lifetime
- 1999-07-26 EP EP19990410089 patent/EP0981140B1/en not_active Expired - Lifetime
- 1999-07-26 ES ES99410089T patent/ES2213999T3/en not_active Expired - Lifetime
- 1999-08-03 NO NO19993766A patent/NO320723B1/en not_active IP Right Cessation
- 1999-08-06 ID IDP990771D patent/ID23712A/en unknown
- 1999-08-12 CN CN 99117729 patent/CN1206670C/en not_active Expired - Fee Related
- 1999-08-13 AU AU44447/99A patent/AU753147B2/en not_active Ceased
- 1999-08-13 BR BR9903587A patent/BR9903587A/en not_active Application Discontinuation
- 1999-08-13 AR ARP990104089 patent/AR021200A1/en active IP Right Grant
- 1999-08-13 EA EA199900657A patent/EA002377B1/en not_active IP Right Cessation
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100391074C (en) * | 2001-10-22 | 2008-05-28 | 阿勒瓦T&D股份有限公司 | Protection system for protecting three-phase distributing transformer with liquip-dielectric insulating and including phase isolating switch |
| CN101292406B (en) * | 2005-08-24 | 2012-08-22 | 立维腾制造有限公司 | Circuit interrupting device with automatic test |
| CN101051735B (en) * | 2006-01-09 | 2012-08-22 | 弗洛雷斯·罗沙达·路易斯·冈萨罗 | Electric distribution network electrical equipment |
| CN110415953A (en) * | 2018-04-27 | 2019-11-05 | 欧玛嘉宝公司技术经济利益集团 | High voltage electric equipment with the device for limiting magnetizing current |
| CN111477523A (en) * | 2020-04-14 | 2020-07-31 | 阳光电源股份有限公司 | Combined fuse, application device thereof and protection method of application device |
Also Published As
| Publication number | Publication date |
|---|---|
| NO993766D0 (en) | 1999-08-03 |
| AU753147B2 (en) | 2002-10-10 |
| EP0981140B1 (en) | 2004-01-28 |
| NO993766L (en) | 2000-02-15 |
| EA199900657A2 (en) | 2000-02-28 |
| EA002377B1 (en) | 2002-04-25 |
| ID23712A (en) | 2000-05-11 |
| CN1206670C (en) | 2005-06-15 |
| NO320723B1 (en) | 2006-01-23 |
| ES2213999T3 (en) | 2004-09-01 |
| EA199900657A3 (en) | 2000-04-24 |
| EP0981140A1 (en) | 2000-02-23 |
| FR2782409A1 (en) | 2000-02-18 |
| DE69914420T2 (en) | 2004-12-02 |
| AR021200A1 (en) | 2002-07-03 |
| BR9903587A (en) | 2000-08-29 |
| FR2782409B1 (en) | 2002-11-29 |
| DE69914420D1 (en) | 2004-03-04 |
| AU4444799A (en) | 2000-03-09 |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050615 Termination date: 20130812 |