WO2022121230A1 - Fusible d'excitation à ruptures multiples ayant des ruptures groupées - Google Patents

Fusible d'excitation à ruptures multiples ayant des ruptures groupées Download PDF

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Publication number
WO2022121230A1
WO2022121230A1 PCT/CN2021/092736 CN2021092736W WO2022121230A1 WO 2022121230 A1 WO2022121230 A1 WO 2022121230A1 CN 2021092736 W CN2021092736 W CN 2021092736W WO 2022121230 A1 WO2022121230 A1 WO 2022121230A1
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WO
WIPO (PCT)
Prior art keywords
conductor
disconnected
group
arc
break
Prior art date
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PCT/CN2021/092736
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English (en)
Chinese (zh)
Inventor
段少波
石晓光
戈西斌
王欣
Original Assignee
西安中熔电气股份有限公司
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Publication of WO2022121230A1 publication Critical patent/WO2022121230A1/fr

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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
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • 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
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/121—Protection of release mechanisms
    • 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
    • H01H85/0039—Means for influencing the rupture process of the fusible element
    • 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
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/055—Fusible members
    • 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
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/165—Casings
    • H01H85/175—Casings characterised by the casing shape or form
    • 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
    • H01H85/38—Means for extinguishing or suppressing arc

Definitions

  • the present disclosure relates to the field of electric power, and in particular, to a multi-break excitation fuse for group disconnection.
  • Products used for circuit overcurrent protection are fuses that are blown based on the heat generated by the current flowing through the fuse.
  • the main problem is how to select a thermal fuse that matches the load. For example, in the case of protecting the main circuit of a new energy vehicle, if the load has a low multiple overload or short circuit, selecting a fuse with a low current specification cannot prevent the current from overshooting in a short time. If a fuse with a high current specification is selected, it cannot meet the fast protection requirements. At present, the output current of lithium battery packs that provide energy to new energy vehicles is about several times the rated current under short-circuit conditions. circuit devices, causing the battery pack to heat up and catch fire.
  • the melting caused by the heating of the withstand current and the heating of the breaking current is caused by the current flowing through the fuse.
  • inrush current such as short-term high current when electric vehicle starts or climbing a slope
  • the fault current of a certain amplitude can be broken at a fast enough breaking speed, or the fault current of a certain amplitude cannot be broken at a fast enough breaking speed , can also achieve higher rated current, or withstand larger overload/impulse current without damage.
  • thermal fuses Another problem with thermal fuses is that they cannot communicate with external devices and cannot be triggered by signals other than current, such as signals from vehicle ECU, BMS or other sensors. If the circuit cannot be cut off in time when the vehicle is in a serious collision, soaked in water, or the battery temperature is too high after exposure, it may lead to serious incidents that the battery pack will burn and eventually damage the vehicle.
  • a structure for quick disconnection and opening on the market which mainly includes a gas generating device, a conductive terminal, and an accommodating cavity configured to receive the dropped conductive terminal.
  • the gas generating device generates high-pressure gas to drive the interrupting device to break Conductive terminals, the broken conductive terminals drop down into the accommodating cavity to achieve the purpose of quick disconnection of the circuit.
  • the above-mentioned quick-breaking cut-off opening structure still has some deficiencies and defects: a single fracture has insufficient arc extinguishing ability, and can only interrupt a small fault current, and it is difficult to interrupt a large fault current. The larger the arc current, the more difficult it is to extinguish. All the arcs are concentrated on one fracture. The arc heats the copper bar and the air, which is easy to be self-sustaining and cannot be extinguished. That is, the arc will not be extinguished immediately after it is generated. When the state is stable, the fracture is When the distance is stable, the voltage is stable, and the current is stable, the arc will continue.
  • the arc In the breaking process of the above-mentioned fuse with a cutting opening structure, the arc is directly cooled by air, and there is no other structure or mechanism to assist the arc extinguishing.
  • a single fracture can generally only work in an environment with a voltage of 500V and below, and it is difficult to achieve breaking in an environment above 500V, because the higher the voltage, the easier it is to form an arc between the fractures, and the arc is more likely to be self-sustaining.
  • the purpose of the present disclosure is to provide a group-disconnected multi-break excitation fuse to improve at least one of the above problems.
  • An embodiment of the present disclosure provides a multi-break energizing fuse disconnected in groups, including a housing, a cavity is opened in the housing, a conductor is passed through the housing, and the cavity is divided into Two parts, an excitation device and an interruption device are sequentially arranged in the cavity on one side of the conductor, and the interruption device is driven by the excitation device to interrupt the conductor; the cavity on the other side of the conductor At least one cutting structure that can cut off the conductor is arranged inside; two groups of weak points for breaking are arranged at intervals along the length direction of the conductor located in the casing; At least one disconnected conductor part that can be disengaged from the original position is formed after the conductor is disconnected at the weak point to form a first group of fractures, and the second group of disconnected weak points is arranged on the disconnected conductor part; when the disconnection When the conductor part is displaced to the cut-off structure, the cut-off structure cuts the cut-off conductor part from the second group of broken weak points to form a second group of
  • the breaking device can first break the first group of weak points on the conductor, and then cooperate with the cutting structure in the housing to break the second group of weak points on the conductor, and then break the second group of weak points on the conductor. Grouping to form fractures.
  • cavities are respectively opened, and the cavities are provided with an arc extinguishing medium or Arc extinguishing structure.
  • the arc-extinguishing medium is gas, liquid or solid particulate matter, and the arc-extinguishing medium is sealed in the cavity through a sealing plate; After the second group of weak points is broken, the cutting structure can break the sealing plate.
  • the arc extinguishing structure is an arc extinguishing grid.
  • an arc-extinguishing chamber is provided on the inner wall of the casing through which the disconnected conductor portion is displaced to the cutting structure, and a solidified arc-extinguishing medium or an arc-extinguishing grid can be arranged in the arc-extinguishing chamber.
  • the cutting structure is a rib.
  • one or more combinations of grooves and holes for reducing conductor strength, reducing conductor width to concentrate stress, and materials with lower strength than the conductor material are used for the disconnected weak point.
  • At least one melt is connected to the conductor in the housing.
  • both ends of the melt are connected to a conductor in parallel, and all disconnected weak points on the conductor are located between the two ends of the melt.
  • one end of the melt is connected to the outside of the outermost one or two disconnected weak points, and the other end of the melt is located outside the cut structure;
  • the disconnected conductor portion is displaced to a position close to the cutting structure and is not disconnected, the disconnected conductor portion can be connected to an end of the melt located outside the cutting structure.
  • a melt is provided at the cut-off structure; when the cut-off conductor part is displaced to a position close to the cut-off structure and is not cut off, the cut-off conductor part is located at both ends of the weak point on the cut-off conductor part Can be connected to both ends of the melt.
  • the excitation device comprises a gas generating device.
  • the breaking device is provided with a plurality of impact heads at intervals.
  • the arc-extinguishing structure includes a solid non-granular arc-extinguishing substance.
  • an embodiment of the present disclosure provides a power distribution unit, the application including the excitation fuse described in any one of the above.
  • an embodiment of the present disclosure provides an energy storage device, the application including the excitation fuse described in any one of the above.
  • an embodiment of the present disclosure provides a new energy vehicle, the application includes the excitation fuse described in any one of the above.
  • Fig. 1 is the structural schematic diagram of the longitudinal section without arc extinguishing medium
  • Fig. 2 is the structural schematic diagram after the formation of the first group of fractures of the structure of Fig. 1;
  • Fig. 3 is the structural representation after the formation of the second kind of fracture of the structure of Fig. 1;
  • FIG. 4 is a schematic structural diagram of a longitudinal section with an arc extinguishing medium
  • Fig. 5 is the structural schematic diagram after the formation of the first group of fractures of the structure of Fig. 4;
  • Fig. 6 is the structural representation after the formation of the second kind of fracture of the structure of Fig. 4;
  • FIG. 7 is a schematic view of the structure of conductors with melts connected in parallel, and between the melts and the rib, and F in the figure represents the melt. Among them, there are a total of five structural schematic diagrams of ABCDE melt parallel solutions;
  • Fig. 8 is the structural schematic diagram after the melt is connected with the disconnected conductor part, wherein A is the scheme A, B is the scheme B; F represents the melt;
  • Fig. 9 is the circuit schematic diagram of scheme A and scheme B, wherein, A is scheme A, B is scheme B; F represents melt.
  • Reference numerals 101-upper casing; 102-exciting device; 103-interrupting device; 104-conductor; 105-lower casing; 107-breaking weak point; 108-impact head; Disconnect the conductor part; 110 - ridge; 112 - arc extinguishing structure; 111 - arc extinguishing melt.
  • the excitation fuse (also referred to as a trigger fuse) proposed in the embodiments of the present disclosure mainly includes a housing, a conductor 104, an excitation device 102 (also referred to as a trigger device), and an interruption device 103.
  • the casing can be composed of upper and lower casings or left and right casings.
  • the upper casing 101 and the lower casing 105 are combined as an example for description.
  • a cavity is opened in the shell.
  • the conductor 104 is inserted between the upper and lower casings, and divides the cavity in the casing into two parts.
  • An excitation device 102 and an interruption device 103 are sequentially arranged in the cavity on one side of the conductor 104 .
  • the interruption device 103 is located between the excitation device 102 and the conductor 104 .
  • the excitation device 102 is fixed by limiting steps and pressing plates (not shown) in the cavity.
  • the excitation device 102 can receive an excitation signal from the outside and act to provide driving force for the interruption device 103 .
  • the excitation device 102 is a gas generating device
  • the breaking device 103 is in sealing contact with the cavity, and the sealing contact is generally achieved by the interference fit between the breaking device 103 and the cavity.
  • the high pressure gas is generated by the detonation of the gas generating device to drive the displacement of the breaking device 103 .
  • the excitation device 102 may also be an air cylinder, a hydraulic cylinder, an electromagnet drive, etc., all of which can act according to the received external excitation signal.
  • the breaking device 103 is fixed in the cavity through the limiting mechanism, so as to ensure that the breaking device 103 is fixed at the initial position, and will not cause malfunction due to displacement in the cavity.
  • the limiting mechanism may be small bumps arranged at intervals on the outer circumference of the breaking device 103, and grooves are formed on the inner wall of the corresponding cavity, and the bumps of the breaking device 103 are snapped into the grooves to achieve position limitation.
  • At least three disconnected weak points 107 are spaced apart on the conductor 104 located in the housing.
  • the conductors 104 in the casing have a trapezoidal structure, and the conductors 104 at the inner side of the casing are respectively provided with disconnected weak points 107 , which are called the first group of disconnected weak points.
  • the conductors 104 between the weak points are provided with two broken weak points 107 spaced apart, which are called the second group of broken weak points, and the two groups have a total of four broken weak points 107 .
  • the purpose of the break weak point 107 is to reduce the breaking strength of the conductor 104, so that it is easier to break when it is impacted.
  • the disconnected weak point 107 can be the conductor 104 with a reduced thickness or the width of the conductor 104 with a reduced width.
  • a U-shaped slot, a V-shaped slot, a hole, etc. are opened on one or both sides of the conductor 104; it is also possible to reduce the width of the conductor 104. structure, so as to generate stress concentration in the transition area, such as reserving a gap; or use low-strength conductor material 107 to replace the body material of conductor 104 at the weak point 107, such as tin, etc.; or use mechanical compression and/or fixed prefabricated Break etc.
  • the breaking device 103 On the end face of the breaking device 103 on one side of the conductor 104, there are spaced impact heads 108 that can break the weak points 107 at the two ends of the conductor 104 in the casing. Between the two impact heads 108, the corresponding conductors Protruding ends are respectively opened at the adjacent positions of the weak point 107 104 . Between the two adjacent protruding ends, a cavity is reserved for the conductor 104 to be completely disconnected at the weak point 107 .
  • the protruding end of the breaking device 103 abuts against the non-contact surface of the breaking conductor portion 200 Breaking the weakness 107 forces the breaking conductor portion 200 to displace within the housing.
  • a sharp-edged rib 110 is provided corresponding to the disconnected weak point 107 on the disconnected conductor portion 200 .
  • the breaking device 103 forces the disconnected part of the conductor 104 to move to the bottom of the housing, the matching rib 110 can disconnect the disconnected weak point 107 on the disconnected conductor part 200 to form a second group of fractures.
  • the fracture includes at least one fracture.
  • a plurality of impact heads 108 may be arranged on the breaking device 103 at intervals, and a convex rib 110 may also be arranged.
  • a convex rib 110 may also be arranged.
  • one broken broken point 107 is set at each end of the conductor 104 in the housing, and three broken broken points 107 are arranged at intervals between the two broken broken weak points 107 .
  • Open weak points 107 wherein, the broken weak points 107 at both ends of the conductor 104 and the broken weak point 107 located in the middle are the first group of broken weak points, located between the weak points at both ends of the conductor 104 and the middle weak point
  • the other two disconnected weak points 107 are the second group of disconnected weak points, that is, the remaining two disconnected weak points 107 except the above-mentioned first group of disconnected weak points are the second group of disconnected weak points.
  • the breaking device 103 is provided with three impact heads 108 at intervals, respectively corresponding to the three broken weak points 107 in the first group of broken weak points, and two raised ribs 110 on the cutting structure are provided, respectively corresponding to the second group of broken weak points. Two of the broken weaknesses 107 correspond.
  • breaking device 103 breaks the conductor 104
  • a first group of breaks and two broken conductor portions 200 separated from the conductor 104 are formed at the conductor 104, and one broken conductor portion 200 is left unbroken on each broken conductor portion 200.
  • the open disconnected weak point 107 as the breaking device 103 moves against the two disconnected conductor parts 200 to the ridge 110 at the bottom of the housing, the raised rib 110 breaks the disconnection on the aforementioned disconnected conductor part 200
  • the weakness 107 forms a second set of fractures.
  • the first group of fractures includes at least two fractures
  • the second group of fractures includes at least one fracture.
  • the conductors 104 are disconnected successively by grouping disconnection, and multiple groups of multiple fractures that are disconnected at different times are formed on the conductors 104 to improve the breaking capacity and the arc extinguishing capacity.
  • an arc extinguishing medium or an arc extinguishing structure 106 is provided at the cavity between the two adjacent protruding ends of the breaking device 103 .
  • the arc extinguishing medium can be gas, liquid, or solid granular arc extinguishing material
  • the arc extinguishing structure is an arc extinguishing grid-like structure or a solid non-granular arc extinguishing material.
  • the raised rib 110 can break the sealing plate 109 of the arc-extinguishing medium, so that the arc-extinguishing medium leaks from the break and covers the weak point 107 for extinguishing. arc.
  • An arc extinguishing structure 112 is provided on the inner wall of the casing through which the disconnected conductor portion 200 is displaced between the bottoms of the casings of the conductor 104 , and the arc extinguishing structure 112 is an arc extinguishing grid-like arc extinguishing structure or a solidified non-granular extinguishing structure.
  • the excitation device 102 acts when receiving an external excitation signal, provides a driving force to the interrupting device 103, drives the interrupting device 103 to impact and displace in the direction of the conductor 104, and the interrupting device 103 first disconnects the device located in the shell.
  • the first group of broken weak points at the inner wall forms a first group of fractures, and the first group of fractures includes at least two fractures.
  • the conductor 104 located in the housing is partially disconnected. At this time, at least one unbroken disconnected weak point 107 remains on the disconnected conductor portion 200 that has been disconnected from the original position, that is, the second group is disconnected.
  • the disconnected conductor portion 200 is forced by the breaking device 103 to move downward to the bottom of the housing until the bottom dead center of the housing, the second set of disconnected weak points on the disconnected conductor portion 200 is at the bottom of the housing ridge 110 Under the action of the fracture, the second group of fractures is formed, and the second group of fractures includes at least one fracture.
  • the above working principle realizes the grouping disconnection of multiple fractures on the conductor 104 .
  • the convex rib 110 will break the sealing plate 109 of the arc-extinguishing medium after breaking the second group of fractures, so that the arc-extinguishing medium pours out at the second group of fractures to participate in the extinguishing arc.
  • the arc resistance at the fracture is much greater than the resistance of conductor 104 .
  • the excitation device 102 drives the interruption device 103 to interrupt the first group of fractures of the conductor 104 after being triggered by an external excitation signal, and an arc is generated after the first group of fractures of the conductor 104 is interrupted.
  • the breaking device 103 continues to move downward and forms a slit with the inner wall of the lower shell Squeeze the arc, the arc is cooled by the arc extinguishing medium in the arc extinguishing chamber inside the lower shell during the movement, the arc resistance increases, the fault current is further reduced to the point where it is difficult to hold the arc, the arc is completely extinguished, and the fault current is cut off;
  • the device 103 continues to move and squeezes the conductors in the middle of the first group of fractures of the conductor 104 with the sharp-edged rib 110 structure of the lower casing.
  • the second group of fractures is broken, forming a clean physical fracture, and enhancing the insulation performance after breaking. If the physical fracture is not clean, that is, there is too much conductive material around the fracture or carbonized conductive material after the arc burns the plastic, the fracture will be easily broken down by voltage, forming a path, reducing the insulating ability, and may cause the arc to reignite and break. fail.
  • the excitation device 102 drives the interruption device 103 to interrupt the first group of fractures of the conductor 104 after being triggered by the external excitation signal, and the first group of fractures of the conductor 104 is disconnected to generate an arc.
  • the arc is connected in series in Between the fractures of the conductor 104, the total resistance increases compared with that before the first group of fractures is disconnected, the voltage across the conductor 104 remains unchanged, and the fault current decreases; the breaking device 103 continues to move downward and forms a slit with the inner wall of the lower shell The arc is squeezed, and the arc is cooled by the arc extinguishing medium in the arc extinguishing chamber inside the lower shell during the movement, the arc resistance increases, and the fault current is further reduced.
  • the breaking device 103 continues to move and squeezes the conductor in the middle of the first group of fractures of the conductor 104 with the sharp-edged rib 110 structure of the lower shell, and the conductor in the middle of the first group of fractures of the conductor 104 is broken at the weak point to form The second set of fractures. A small arc is generated at the second group of fractures.
  • the breaking device 103 cooperates with the lower casing to squeeze the arc between the second group of fractures, the arc is cooled by the arc-extinguishing medium in the groove at the lower end of the breaking device 103.
  • the resistance continues to increase, the fault current is reduced to the point where it is difficult to hold the arc, the arc is completely extinguished, and the fault current is cut off.
  • an auxiliary arc extinguishing melt 111 is also provided on the conductor 104 .
  • Arc-extinguishing melt arrangement scheme A as shown in A in FIG. 7 , conductors 104 on both sides of all disconnected weak points 107 of conductor 104 are respectively connected to one end of an arc-extinguishing melt 111 , and the other end of the arc-extinguishing melt is connected. One end is arranged on the bottom of the casing outside all the ridges 110. Before the breaking conductor part 200 moves to the sharp-edged ridges 110 at the bottom of the casing, both ends of the breaking conductor part 200 are in contact with the arc-extinguishing melt. Connection; as the breaking device 103 continues to move, the rib 110 breaks the breaking weakness 107 on the breaking conductor portion 200 to form a second set of fractures.
  • the arc-extinguishing melt arrangement B as shown in B in FIG. 7 , is provided with arc-extinguishing melts 111 on both sides of the ridges 110 at the bottom of the casing, and both ends of the arc-extinguishing melt are slightly higher than the ridges 110 .
  • the fractures include two groups of fractures of the conductor 104 and fractures of the arc-extinguishing melt.
  • Arrangement scheme D and E of the arc-extinguishing melt connect one end of the arc-extinguishing melt to the conductor 104 on the outer side of all the disconnected weak points 107 of the conductor 104, and the other end of the arc-extinguishing melt.
  • One end is arranged on the bottom of the casing outside the convex rib 110.
  • one end of the disconnecting conductor part 200 is connected with the arc-extinguishing melt; As the breaking device 103 continues to move, the cooperating rib 110 breaks the broken weak point 107 on the broken conductor part 200 to form a second group of fractures.
  • the melts in the above-mentioned schemes A, D, and E can be located on one side or both sides of the rib 110; the melts in schemes B and C can be arranged through the rib 110, or can be placed in the shell below the rib 110. in the body wall. In a word, the setting of the melt does not affect the breaking of the weak point 107 of the conductor part 200 by the rib 110 .
  • FIG. 8 is a schematic diagram of the structure when the arc-extinguishing melt is in contact with the disconnected conductor portion 200 .
  • picture A is a schematic diagram of the structure when scheme A is working
  • picture B is a schematic diagram of the structure when scheme B is working. Since the principles of schemes A, D, and E are the same, only scheme A is taken as an example.
  • Option C The melt is not in contact with the disconnected conductor portion 200, and no structural diagram is provided.
  • the resistance of the melt (RF1, RF2, RF3) is much greater than the resistance of the conductor 104.
  • the total resistance of the excitation fuse is approximately equal to the resistance of the conductor 104; after the conductor 104 is disconnected, the arc at the fracture The resistance is much greater than that of the melt (RF1, RF2, RF3).
  • the middle conductor of the conductor 104 will interact with the melt F1 and the melt during the downward movement of the conductor 104.
  • the body F2 is connected, the fault current will flow through the melt F1 and the melt F2, the fracture resistance between the ac and bd is much larger than that of the melt, so almost no arc is generated, and the melt F1 and the melt F2 are connected in series at this time.
  • the total resistance increases compared to that before the first group of fractures is disconnected, the voltage across the conductor 104 remains unchanged, and the fault current decreases.
  • the fault current flowing through the melt F1 and the melt F2 is not enough to fuse the melt, and the weak point 107 of the disconnection between the ce
  • the weak point 107 between the disconnection and de is interrupted to form a second group of fractures, the arc generated at the second group of fractures is squeezed, the arc resistance increases, the fault current is reduced to the point where it is difficult to hold the arc, the arc is completely extinguished, and the fault occurs.
  • the current is cut off; under the medium multiple fault current, the fault current flowing through the melt F1 and the melt F2 causes the narrow diameter of the melt F1 and the melt F2 to start to melt.
  • the weak point 107 between 107 and de is broken to form a second group of fractures, the arc generated at the second group of fractures is squeezed, and the melt and the second group of fractures work together to extinguish the arc and break the fault current; high multiples Under the fault current, the fault current flowing through the melt F1 and the melt F2 makes the melt F1 and the melt F2 fuse rapidly, and the fault current is cut off. At this time, the second group of fractures is interrupted, which enhances the insulation performance after breaking.
  • the first group of fractures is sufficient to interrupt the low multiple fault current; under the medium multiple fault current, the arc generated by the first group of fractures is elongated, Squeeze but still hold the arc, the disconnection weak point 107 between ce and de is interrupted to form the second group of fractures, the fault current flows through the melt F3, and the second group of fractures Almost no arc is generated.
  • the melt F3 is connected in series in the circuit, and the total resistance is increased compared with that before the second group of fractures is interrupted. The fault current is further reduced to the point where it is difficult to hold the arc.
  • the arc is completely extinguished and the fault current is cut off; Under the multiple fault current, the arc generated by the first group of fractures is elongated and squeezed but can still hold the arc, and the broken weak point 107 between ce and de is interrupted to form the second group. After the fracture, the fault current flows through the melt F3, almost no arc is generated at the second group of fractures, and the fault current is cut off with the melting of the melt F3.
  • the excitation fuses are grouped on the conductor 104 successively to form multiple groups of multiple fractures in sequence, and the multiple fractures formed by the multiple groups of time delays realize the reliability of arc extinguishing and disconnection, and improve the reliability of arc extinguishing and disconnection. Breaking capacity and arc extinguishing capacity.

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  • Fuses (AREA)

Abstract

L'invention concerne un fusible d'excitation à ruptures multiples ayant des ruptures groupées, comprenant un boîtier, un conducteur, un dispositif d'excitation et un dispositif de rupture. Le dispositif de rupture est apte à rompre le conducteur sous l'excitation du dispositif d'excitation. Au moins une structure de coupure capable de découper le conducteur est disposée dans une cavité de l'autre côté du conducteur. Deux groupes de points faibles de rupture sont disposés à des intervalles le long de la direction de la longueur du conducteur situé dans le boîtier. Après que le dispositif de rupture rompt le conducteur du premier groupe de points faibles de rupture, au moins une partie de conducteur de rupture qui peut être libérée d'une position d'origine est formée, pour former un premier groupe de ruptures, et le second groupe de points faibles de rupture est disposé sur la partie de conducteur de rupture. Lorsque la partie de conducteur de rupture est déplacée vers la position d'une structure de coupure, la structure de coupure découpe la partie de conducteur de rupture du second groupe de points faibles de rupture pour former un second groupe de ruptures. Le premier groupe de ruptures comprend au moins deux ruptures, et le second ensemble de ruptures comprend au moins une rupture. La présente structure de fusible d'excitation est capable d'améliorer la capacité de rupture et la capacité d'extinction d'arc.
PCT/CN2021/092736 2020-12-11 2021-05-10 Fusible d'excitation à ruptures multiples ayant des ruptures groupées WO2022121230A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202011461044.6 2020-12-11
CN202011461044.6A CN112447463A (zh) 2020-12-11 2020-12-11 一种分组断开的多断口激励熔断器

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WO2022121230A1 true WO2022121230A1 (fr) 2022-06-16

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WO (1) WO2022121230A1 (fr)

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