Electric fusion protection electric appliance

Abstract

The invention provides an electric fusion protection electric appliance, which at least comprises a circuit breaker, at least one fuse and other elements, and is characterized in that the circuit breaker at least comprises an insulating shell, a moving contact, at least one static contact, an arc extinguish chamber, an operating mechanism, an overload protection device, a first wiring end, a second wiring end and a fuse connection device; the arc extinguish chamber is arranged in front of the moving contact in the height direction, and the fuse is arranged in front of or behind or on the left of or on the right of or below the operating mechanism or / and the moving contact or / and the overload protection device in an insulating mode in the length direction or the width direction or the height direction. When there is no short-circuit fault current, no current passes through the fuse, or the current passing through the fuse is smaller than the current passing through the moving contact. According to the molded case circuit breaker, rapid current limiting is achieved through the fuse, shunting / voltage dividing breaking and protection during a large-current fault under ultra-high voltage are achieved, the effect of complementation of double advantages is achieved, and the capacity that the molded case circuit breaker is broken by 50 kA or above when DC1500V-2500V is achieved.

Description

Technical Field

[0001] The present invention relates to the field of low-voltage electrical appliances, and specifically to an electrical integrated protection appliance. Background Art

[0002] A fuse refers to an electrical appliance that, when the current exceeds a specified value, melts the fuse element by generating heat itself to disconnect the circuit. The breaking capacity of the fuse can reach more than 50KA, the current-limiting ability is strong, and the let-through energy is low. However, after the fuse melts, a new fuse element needs to be replaced to work properly. It is a one-time working electrical appliance. Also, due to serious heating, in engineering, fuses with a rated current more than twice are used for configuration, which increases the cost, makes the fuse lose its protection function at low fault currents, and there are potential safety hazards. Moreover, the heating situation cannot be greatly improved, and additional devices such as fans are added to the equipment to cool down.

[0003] A circuit breaker refers to a switching device that can close, carry, and interrupt the circuit under normal circuit conditions and can close, carry, and interrupt the current under abnormal circuit conditions within a specified time. After the circuit breaker interrupts the fault current, it generally does not need to replace components to be closed and used, but its breaking capacity is not strong, the breaking time is long, and the current-limiting ability is not strong.

[0004] Now, with the development of new energy power systems, there are higher requirements for the working voltage and breaking capacity of protection appliances. For example, in energy storage systems, the DC voltage is as high as 2500V, the short-circuit breaking capacity requirement is 250KA, and it can frequently and repeatedly cut off normal and abnormal currents below 10In. In engineering, fuses and disconnectors are used in combination, which results in phenomena such as high temperature, protection malfunction, and inability to carry normal current due to the metallurgical effect of the fuse, affecting the normal use of the equipment and a large increase in operation and maintenance work.

[0005] Therefore, an electrical integrated protection appliance is provided. For normal operation or small short-circuit current values, the circuit breaker provides multiple protections. During normal working current, the fuse does not participate in the work and does not generate heat. The fuse does not participate in overcurrent small current protection and only has the protection function for extremely large currents, reducing the current-carrying value of the fuse by more than 40%. In this way, the contact setting of the circuit breaker will be very simple and the cost will be very low. Only when there is an extremely large short-circuit current does the fuse participate in the protection. This requires that the fuse for backup protection takes shunt measures and protects simultaneously with the moving contact system during extremely large short-circuit faults.

[0006] This kind of protection appliance with the voltage division / current shunt protection technology of fuse + circuit breaker is urgently needed in the market. Summary of the Invention

[0007] Based on the above background, the present invention provides an electrical integrated protection appliance, which can achieve high-voltage and large-current interruption, and uses an arc extinguishing chamber and a fuse to achieve the purpose of rapid current limiting, improve the arc extinguishing ability, and achieve the interruption ability at a higher voltage level.

[0008] The present application discloses an electrical integrated protection appliance, which at least includes a circuit breaker, at least one fuse and other components. The circuit breaker at least includes an insulating housing, a moving contact, at least one static contact, an arc extinguishing chamber, an operating mechanism, an overload protection device, a first terminal, a second terminal, and a fuse connection device. The arc extinguishing chamber is arranged in front of the moving contact in the height direction, and the fuse is arranged in front of or behind or to the left or right or below the operating mechanism or / and the moving contact or / and the overload protection device in the length direction or width direction or height direction in an insulated manner. When there is no short-circuit fault current, no current passes through the fuse or the current passing through the fuse is less than the current passing through the moving contact.

[0009] In the above embodiment, the fuse is integrated inside the circuit breaker, and the fuse is arranged below the internal components of the circuit breaker, namely the operating mechanism or / and the moving contact or / and the overload protection device, reducing the copper busbar arrangement in the energy storage box, effectively utilizing the space, greatly saving the width space of the high-voltage energy storage box, and improving the space utilization rate of the high-voltage energy storage box. The voltage division / current sharing technology of the circuit breaker and the fuse effectively improves the utilization rate of the circuit breaker and the fuse. Under normal working conditions or in the case of a very small short-circuit current, the circuit breaker conducts multiple protections without the participation of the fuse. Only when a large short-circuit current occurs during a fault, the fuse cooperates with the circuit breaker to simultaneously protect the system. This combined mode improves the rationality and reliability of the system, and at the same time reduces the workload of system operation and maintenance.

[0010] In some embodiments, the rated current value of the fuse is set to be less than the rated current value of the circuit breaker.

[0011] In the above embodiment, the rated current value of the adopted fuse is less than that of the circuit breaker. In this way, the fuse has a small volume and low cost. At the same time, since there is no copper wire connection row between the fuse and the disconnector in the integrated electrical appliance, the cost of copper busbars can be saved, as well as the cost of the height of the energy storage box, installation costs, etc.

[0012] In some embodiments, the static contact is a fixed static contact or / and a rotatable repulsive static contact.

[0013] In some embodiments, the fuse connecting device at least includes at least two conductors with opposite current directions arranged between the first terminal or the second terminal and the static contact, and at least one connecting conductive part. At least one of the two conductors with opposite current directions is repelled by the electromagnetic repulsion force when a short-circuit current occurs, driving the connecting conductive part to connect the power supply of the first terminal or the second terminal to the fuse, or to connect the repelled conductor to the fuse.

[0014] In the above embodiments, the action of the connecting conductive part is determined by the circuit current. During normal or large short-circuit currents, the connecting conductive part is not repelled, and only the moving contact and the arc extinguishing chamber are used for opening and protection. During extremely large fault short-circuits, the short-circuit current flows through the connecting conductive part, forming a strong electrodynamic force between the moving contact and the static contact, and between the first incoming line terminal and the connecting conductive part. The connecting conductive part is repelled and completes the switching in milliseconds, guiding the short-circuit current to transfer to the fuse branch, using the fuse to melt to achieve the purpose of rapid current limiting, realizing the breaking and protection of large current faults under extremely high voltages, achieving the effect of complementary advantages of the two, realizing the ability of the molded case circuit breaker to break more than 100 kA at DC 2500 V, and improving the arc extinguishing ability to achieve a breaking ability at a higher voltage level.

[0015] In some embodiments, when no short-circuit current flows through, the connecting conductive part is insulated from any one of the at least two conductors with opposite current directions or from the second conductive end of the fuse.

[0016] In some embodiments, the first conductive end of the fuse is directly or indirectly connected to the first terminal or the second terminal.

[0017] In some embodiments, when a short-circuit current passes through, the static contact is repelled by the Lorentz force and a first break is generated. At least one of the two conductors with opposite current directions is repelled by the electromagnetic repulsion force when a short-circuit current occurs and a second break is generated, and two arcs are generated simultaneously. The arc energy generated by the first break is more than 3 times that of the arc energy generated by the second break.

[0018] In some embodiments, for the opening distances of the two breaks generated after being repelled by the Lorentz force, the opening distance of the first break is a large opening distance, and the opening distance of the second break is a small opening distance. The opening distance of the first break is greater than that of the second break.

[0019] In some embodiments, both the first break and the second break are air breaks.

[0020] In the above embodiments, by increasing the number of breaks and dividing the extremely high voltage, a higher breaking ability under extremely high voltages can be achieved.

[0021] In some embodiments, the connecting conductive member is disposed around the first break or the second break.

[0022] In some embodiments, a pre-pressure device is provided on the connecting conductive member.

[0023] In some embodiments, the pre-pressure device includes a torsion spring or a compression spring.

[0024] In the above embodiments, by providing the pre-pressure device, the connecting conductive member is maintained with a moment to rotate towards the first extension conductor of the first connection terminal. When a short-circuit current is generated, reliable contact between the connecting conductive member and the first extension conductor is ensured, so that the first connection terminal is connected to the fuse, and the short-circuit current is directed to the fuse circuit.

[0025] In some embodiments, the connecting conductive member is connected to the second conductive end of the fuse through a flexible conductor or a rigid conductor.

[0026] In some embodiments, a connecting conductor is connected between the first conductive end of the fuse and the repulsive static contact.

[0027] In some embodiments, the connecting conductor is a flexible conductor or a rigid conductor.

[0028] In some embodiments, the two conductors with opposite current directions include a first conductor and a second conductor. The second conductor is disposed on the static contact or is directly or indirectly connected to the static contact. A first contact portion is provided at one end of the second conductor, and a second contact portion is provided at the other end. A movement fulcrum is provided between the first contact portion and the second contact portion.

[0029] In some embodiments, a third contact portion and a fourth contact portion are provided at one end of the first conductor, and the other end is directly or indirectly connected to the first connection terminal.

[0030] In some embodiments, a fifth contact portion is provided at one end of the connecting conductive member. The fifth contact portion is correspondingly disposed with the fourth contact portion of the first conductor. The contact mode between the first conductor and the connecting conductive member is planar pressure contact or chuck type contact.

[0031] In some embodiments, an insulating member is provided between the fourth contact portion of the first conductor and the fifth contact portion of the connecting conductive member.

[0032] In the above embodiments, the setting of the insulating member plays a role in forcibly isolating the arc. The arc is isolated from the main circuit. After the insulating member rotates, the first connection terminal is connected to the conductive end of the fuse link, forcing the current to flow out towards the fuse link.

[0033] In some embodiments, a connecting conductor having an equipotential is disposed adjacent to and insulated from one end of the second conductor and the first conductive end of the fuse.

[0034] In some embodiments, the connecting conductive member is disposed in front of the repulsive static contact. When a large short-circuit current passes through, the insulating member is carried away by the repulsive static contact, and the connecting conductive member connects to the power supply of the first terminal or the second terminal. Before the current flows through the repulsive static contact after the connecting conductive member connects to the power supply, the arc generated by the repulsion of the repulsive static contact is relatively small.

[0035] In some embodiments, when a short circuit occurs in the electrical fusion protection appliance, the first conductor is connected to the connecting conductive member, then the fuse is connected, then the connecting conductor is connected, then the static contact is connected, and then directly or indirectly connected to the moving contact to form a series circuit of current.

[0036] In some embodiments, the connecting conductive member is disposed adjacent to and insulated from the second conductive end of the fuse when no short-circuit fault current flows through.

[0037] In some embodiments, the connecting conductive member is driven by the electromagnetic repulsive force generated by the short-circuit current to be electrically connected to the second conductive end of the fuse.

[0038] In some embodiments, after the second conductive end of the fuse is connected by the connecting conductive member, a loop is formed to form a shunt loop with the arc loop generated during the short-circuit protection action of the moving contact.

[0039] In some embodiments, the first conductive end of the fuse is disposed on the conductive member between the rear conductive body of the moving contact and the second terminal or on the conductive member between the static contact and the first terminal.

[0040] In some embodiments, the connecting conductive member is disposed on the reverse current repulsive force-shaped loop formed by the connecting conductor between the static contact and the first extended conductor of the first terminal.

[0041] In some embodiments, the connecting conductive member is directly disposed on the repulsive static contact.

[0042] In some embodiments, the connecting conductive member is disposed on the reverse current repulsive force-shaped loop formed by the second extended conductor between the rear conductive body of the moving contact and the second terminal.

[0043] In some embodiments, a flexible conductor is disposed on the fixed static contact. One end of the flexible conductor is connected to the first terminal, and the first terminal is provided with a first extended conductor. The flexible conductor and the first extended conductor form a repulsive force structure.

[0044] In some embodiments, a connecting conductive member is disposed on the soft conductor, and an elastic member is disposed on the connecting conductive member. Under the action of the elastic member, the connecting conductive member maintains an insulating distance from the second conductive end of the fuse when there is no short-circuit current.

[0045] In some embodiments, the connecting conductive member is long-shaped, square-shaped, circular-shaped, or any combination of the above shapes.

[0046] In some embodiments, one end of the connecting conductive member is provided with a third soft conductor, and the other end is provided with a fourth soft conductor. The third soft conductor is connected to the conductive body at the rear of the moving contact, and the fourth soft conductor is connected to the second extension conductor of the second terminal. After the connecting conductive member is repelled, it is connected to the second conductive end of the fuse.

[0047] In some embodiments, one end of the repelling static contact is provided with an alloy contact that contacts the moving contact, and the other end is provided with a fifth soft conductor. One end of the fifth soft conductor is connected to the first terminal, and the first terminal is provided with a first extension conductor. The fifth soft conductor and the first extension conductor form a repulsive structure. A connecting conductive member is disposed on the fifth soft conductor. After the connecting conductive member is repelled, it is connected to the second conductive end of the fuse.

[0048] In some embodiments, one end of the repelling static contact is provided with an alloy contact that contacts the moving contact, and the other end is provided with a connecting conductive member and a first contact point. The first terminal is provided with a first extension conductor, and a second contact point is provided on the first extension conductor. The first contact point and the second contact point are correspondingly arranged. A second soft conductor is disposed around the other end of the repelling static contact and is connected to the first extension conductor. After the connecting conductive member is repelled, it is connected to the second conductive end of the fuse, and no arc is generated between the first contact point and the second contact point.

[0049] In some embodiments, the connecting conductive member is provided with a third contact point, and the second conductive end of the fuse is provided with a fourth contact point. The third contact point and the fourth contact point are correspondingly arranged. After the connecting conductive member is repelled, the third contact point contacts the fourth contact point, so that the connecting conductive member is connected to the second conductive end of the fuse.

[0050] In some embodiments, the operating mechanism drives the moving contact to make a connecting or disconnecting movement with the static contact.

[0051] In some embodiments, the fuse can also be disposed at a certain angle between the length and the width directions.

[0052] In some embodiments, when both the moving contact and the repelling static contact are repelled by the electromagnetic field of a large current, at least more than 30% of the current passes through the fuse circuit.

[0053] In the above embodiments, when the repulsive static contact is repelled, the connecting conductive member on the repulsive static contact is electrically connected to the fuse, and the large short-circuit current due to the fault is guided to the fuse branch, achieving fast high breaking capacity.

[0054] In some embodiments, when both the moving contact and the repulsive static contact are repelled by the electromagnetic field of the large current, the moving contact is repelled first, and then the connecting conductive member on the repulsive static contact is connected to the second conductive end of the fuse.

[0055] In some embodiments, a rotation fulcrum is provided at a non-central position between the alloy contact and the first contact point, and holes or protrusions for hanging springs are provided around the rotation fulcrum.

[0056] In the above embodiments, the required parameters of the circuit breaker contacts are ensured, and the basic final pressure requirements are met.

[0057] In some embodiments, when the second flexible conductor is connected to the first extended conductor, the repulsive static contact is provided on the bracket through a rotation fulcrum.

[0058] In some embodiments, an insulating layer is provided between the connecting conductive member and the second conductive end of the fuse.

[0059] In the above embodiments, the creepage distance and the electrical clearance required for the insulation between the connecting conductive member and the second conductive end of the fuse in the air are very large. By providing the insulating layer, the creepage distance and the electrical clearance can be increased, and the insulation requirements can be met by using simple materials.

[0060] In some embodiments, the insulating layer is at least one piece of high-voltage insulating film.

[0061] In some embodiments, the insulating layer further includes two insulating plates, the high-voltage insulating film is fixed between the two insulating plates, and the insulating layer is inserted into the insulating housing.

[0062] In the above embodiments, the high-voltage insulation requirements are met by using simple insulating materials and structures.

[0063] In some embodiments, the insulating layer is provided on the connecting conductive member or / and on the second conductive end of the fuse or / and between the connecting conductive member and the second conductive end of the fuse.

[0064] In some embodiments, a piercing member is provided around the connecting conductive member or the second conductive end of the fuse, and the piercing member is provided with at least one sharp portion.

[0065] In the above embodiments, the contact surface of the third contact point on the connecting conductive member is a plane, and when it contacts the high-voltage insulating film under the repulsive force, it may not be able to penetrate the high-voltage insulating film. A piercing member is provided to assist the contact point to penetrate the high-voltage insulating film faster.

[0066] In some embodiments, the sharp part of the piercing member protrudes from the end face of the connecting conductive member or the end of the second conductive end of the fuse.

[0067] In the above embodiments, the sharp part of the piercing member protrudes from the end face of the connecting conductive member, and the sharp part contacts the high-voltage insulating film first. The force exerted on the high-voltage insulating film by point or line contact is greater than that by surface contact, reducing the hindrance to the rotation of the connecting conductive member.

[0068] The beneficial effects of the present invention are as follows:

[0069] 1. The action of the connecting conductive member is determined by the circuit current. In normal or large short-circuit currents, the connecting conductive member is not repelled, and only the moving contact and the arc extinguishing chamber are used for opening and protection. In the case of a particularly large fault short circuit, the short-circuit current flows through the connecting conductive member, and a strong electrodynamic force is formed between the moving contact and the static contact, and between the first incoming line end and the connecting conductive member. The connecting conductive member is repelled and the switching is completed in milliseconds, guiding the short-circuit current to transfer to the fuse branch. The fuse is used to achieve fast current limiting by fusing, and the fuse realizes the breaking and protection of large current faults under extremely high voltages, achieving the effect of double complementary advantages, realizing the ability of the molded case circuit breaker to break more than 100 kA at DC 2500 V, and improving the arc extinguishing ability and realizing the breaking ability at a higher voltage level.

[0070] 2. The fuse is integrated inside the circuit breaker, and the fuse is arranged below the operating mechanism of the internal components of the circuit breaker or / and the moving contact or / and the overload protection device, reducing the copper busbar arrangement in the energy storage box, effectively using the space, and can greatly save the width space of the energy storage box and improve the space utilization rate of the high-voltage energy storage box.

[0071] 3. The rated current value of the fuse used in the integrated electrical appliance of the present invention is smaller than the rated current value of the circuit breaker. In this way, the fuse has a small volume and low cost. At the same time, the integrated electrical appliance can save the cost of the copper busbar because there is no copper wire connecting row between the fuse and the disconnecting switch, as well as the cost of the height of the energy storage box, installation cost, etc.

[0072] 4. A high-voltage insulating film is provided between the connecting conductive member and the fuse to ensure the electrical clearance and creepage distance with a very small spacing. In the case of a faulty circuit, it does not prevent the connecting conductive member from penetrating the high-voltage insulating film to guide the transfer of the short-circuit current. The design structure is simple, and the electrical performance and reliability are improved.

[0073] 5. When a fuse is connected in series in a circuit, a new break is added to the circuit. At the same time, the voltage for breaking is higher, dividing the high voltage, reducing the energy borne by each break, and enabling the arc to be interrupted faster.

[0074] 6. When the fuse is connected in parallel in the circuit, there is no need to configure a fuse with a higher rated current. At the same time, the heat source of the fuse is removed, reducing power consumption, and there is no need to add additional cooling facilities to the equipment, greatly reducing costs.

[0075] 7. When there is no short-circuit fault current, no current passes through the fuse. Therefore, there is no metallurgical effect in the fuse, ensuring that the characteristics do not change and no temperature rise occurs. When a large short-circuit current flows through the connected conductive part, under the action of the double repulsive force structure, the piercing part penetrates the high-voltage insulating film and contacts the fuse, ensuring reliable interruption of the short-circuit current and effectively improving the current-limiting effect.

[0076] 8. This voltage division / current division technology of the circuit breaker + fuse effectively improves the utilization rate of the circuit breaker and the fuse. During normal operation or in the case of a very small short-circuit current, the circuit breaker provides multiple protections without the need for the fuse to participate. When there is a large short-circuit current during a fault, the fuse cooperates with the circuit breaker to provide system protection simultaneously. This combined mode improves the rationality and reliability of the system, and at the same time reduces the workload of system operation and maintenance. Description of the Drawings

[0077] To more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0078] Figure 1 Schematic diagram of the normal connection state disclosed in the first embodiment;

[0079] Figure 2 Schematic diagram of the normal disconnection state disclosed in the first embodiment;

[0080] Figure 3 Schematic diagram of the large current short-circuit fault state disclosed in the first embodiment;

[0081] Figure 4 Schematic diagram of the repulsive static contact with a second soft conductor disclosed in the first embodiment;

[0082] Figure 5 Explosion diagram of the repulsive static contact with a second soft conductor disclosed in the first embodiment;

[0083] Figure 6Schematic diagram of the normal circuit position of the repulsive static contact and the fuse disclosed in the first embodiment;

[0084] Figure 7 Schematic diagram of the fault circuit position of the repulsive static contact and the fuse disclosed in the first embodiment;

[0085] Figure 8 Schematic diagram of the force analysis of the magnetic field on the repulsive static contact disclosed in the first embodiment;

[0086] Figure 9 Schematic diagram of the structure on the repulsive static contact disclosed in the first embodiment;

[0087] Figure 10 Schematic diagram of the structure of the insulating layer disclosed in the first embodiment;

[0088] Figure 11 Schematic diagram of the structure of the piercing member disclosed in the first embodiment;

[0089] Figure 12 Schematic diagram of the normal circuit state disclosed in the second embodiment;

[0090] Figure 13 Schematic diagram of the fault circuit state disclosed in the second embodiment.

[0091] Figure 14 Schematic diagram of the normal circuit state disclosed in the third embodiment;

[0092] Figure 15 Schematic diagram of the fault circuit state disclosed in the third embodiment;

[0093] Figure 16 Schematic diagram of the structure of the static contact as a fixed static contact disclosed in the third embodiment;

[0094] Figure 17 Schematic diagram of the normal circuit state disclosed in the fourth embodiment;

[0095] Figure 18 Schematic diagram of the fault circuit state disclosed in the fourth embodiment;

[0096] Figure 19 Schematic diagram of the normal circuit state disclosed in the fifth embodiment;

[0097] Figure 20 Schematic diagram of the fault circuit state disclosed in the fifth embodiment;

[0098] Figure 21 Schematic diagram of the structure of an electrical fusion protection appliance disclosed in the sixth embodiment;

[0099] Figure 22 Schematic diagram of the structure of an electrical fusion protection appliance disclosed in the seventh embodiment;

[0100] Figure 23 Schematic structural diagram of an electrical integrated protection appliance disclosed in the eighth embodiment;

[0101] Figure 24 Schematic structural diagram of an electrical integrated protection appliance disclosed in the ninth embodiment;

[0102] Figures 25 - 29 Schematic structural diagram of an electrical integrated protection appliance disclosed in the tenth embodiment. Specific implementation manners

[0103] To make the purposes, technical solutions and advantages of the implementation of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The described embodiments are some but not all of the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as a limitation to the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0104] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0105] First embodiment:

[0106] Please refer to Figures 1 - 3 , this embodiment discloses an electrical integrated protection appliance, which at least includes a circuit breaker, at least one fuse 250 and other components. The circuit breaker at least includes an insulating housing 100, a moving contact 210, at least one static contact 220, an arc extinguishing chamber 230, an operating mechanism 260, an overload protection device 240, a first terminal 270, a second terminal 280, and a fuse connection device 290. The arc extinguishing chamber 230 is arranged in front of the moving contact 210 in the height direction. The fuse 250 is arranged insulatingly in the length direction below the operating mechanism 260, the moving contact 210 and the overload protection device 240. When there is no short-circuit fault current condition, no current passes through the fuse 250 or the current passing through the fuse 250 is less than the current passing through the moving contact 210.

[0107] The fuse connecting device 290 at least includes a first conductor 11 and a second conductor 12 with opposite current directions disposed between the first terminal 270 and the repulsive static contact 122, and a connecting conductive member 600, and the connecting conductive member 600 is directly disposed on the static contact. The static contact 220 is a repulsive static contact 122, and the first conductive end 251 of the fuse is disposed on a conductive member between the rear conductive body 2101 of the moving contact and the second terminal 280. The first conductive end 251 of the fuse is indirectly connected to the second terminal 280 through a conductive member. The second conductive end 252 of the fuse 250 is disposed adjacent to the connecting conductive member 600 inside the circuit breaker in an insulated manner; the connecting conductive member 600 is driven by an electromagnetic repulsive force generated by a short-circuit current to be electrically connected to the second conductive end 252 of the fuse; after the second conductive end 252 of the fuse is connected by the connecting conductive member 600, a loop is formed to form a shunt loop with the arc loop generated during the short-circuit protection action of the moving contact 210.

[0108] In this application, by connecting the fuse 250 and the circuit breaker in parallel, the problem of large physical space required for the series connection of the fuse and the circuit breaker in the existing high-voltage box circuit can be avoided. Especially when the fuse is integrated inside the circuit breaker, the copper bar arrangement in the box can be reduced, and the space can be effectively utilized.

[0109] Preferably, as Figure 8 shown, in order to quickly open between the moving contact 210 and the repulsive static contact when passing through a large fault current, quickly connect between the repulsive static contact and the fuse 250, and improve the force and speed during repulsion, so as to facilitate the use of the fuse 250 for quick protection during a fault, repulsive force segments with opposite current directions are respectively provided on the moving contact 210 and the repulsive static contact 122. The repulsive force segment of the moving contact 210 and the repulsive force segment of the repulsive static contact form a reverse-current repulsion structure, and a reverse-current repulsive force structure is also provided between the repulsive static contact 122 and the first terminal 270.

[0110] In this embodiment, the repulsive static contact 122 is provided with an alloy contact 221, a first contact point 1000, and a third contact point 223. A rotation fulcrum 224 is provided at a non-central position between the alloy contact 221 and the first contact point 1000, and holes 225 or protrusions for hanging springs are provided around the rotation fulcrum 224.

[0111] A first extension conductor 271 is provided on the first terminal 270. A second contact point 2000 is provided on the extension conductor 271. The second contact point 2000 contacts the first contact point 1000 on the repulsive static contact 122. A second flexible conductor 1071 that is movably connected to the first terminal 270 is provided around the first contact point 1000.

[0112] Further, as shown in Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 9 , Figure 10 and Figure 11 , the circuit breaker further includes a bracket 217. The bracket 217 is fixed to the first terminal 270 by screws or riveting. The bracket 217 is provided with a limit hole 217a, a rotation hole 217b, and a hanging spring fulcrum hole 217c. The holes of the repulsion static contact 122 for the rotation fulcrum 224 and the hanging spring hole 225 are equipped with a shaft 288, which are respectively matched with the rotation hole 217b and the limit hole 217a of the bracket 217. The hanging spring fulcrum hole 217c of the bracket 217 is equipped with a hanging spring shaft 229. One end of the spring 227 is connected to the hanging spring shaft 229, and the other end is connected to the shaft 288 passing through the limit hole 217a of the bracket 217. When the repulsion static contact 122 rotates around the rotation fulcrum 224, the limit hole 217a ensures that the repulsion static contact 122 moves within a preset rotation range. In addition, outside the structure shown in Figure 5 , an insulating cover 276 is installed, which can prevent the internal structure from being damaged by the arc generated when the moving contact 210 and the repulsion static contact 122 are separated, resulting in unstable performance.

[0113] Preferably, an insulating layer 300 is provided between the third contact point 223 and the second conductive end 252 of the fuse 250. The insulating layer 300 is made of at least one piece of high-voltage insulating film 301 material. In this embodiment, the insulating layer 300 is composed of the high-voltage insulating film 301 and insulating plates 302 located on both sides of the high-voltage insulating film. The high-voltage insulating film 301 is fixed between them by riveting the two insulating plates 302. The insulating layer 300 is inserted into the insulating housing 100. Usually, it meets the withstand voltage requirements of high voltages of DC1500V - 2500V. The electrical clearance and creepage distance need to be at least 14mm and 25mm or more. Through this insulating layer 300, the electrical clearance and creepage distance required for high voltages can be achieved with a very small open distance in a small space. In other embodiments, the insulating layer 300 can be provided on the third contact point 223 or the second conductive end 252 of the fuse 250.

[0114] As shown in Figure 6 and Figure 7As shown, the distance between the insulating layer 300 and the fourth contact point 253 on the second conductive end 252 of the fuse 250 is less than the distance between the insulating layer 300 and the third contact point 223. The fourth contact point 253 and the insulating layer 300 are in a relatively static state, and there is only a gap for the high-voltage insulating film 301 not to be scratched by the fourth contact point 253. During the process of electrical connection or disconnection between the moving contact 210 and the repulsive static contact 122, the third contact point 223 has a tendency to rotate closer to the high-voltage insulating film 301. In this process, it is necessary to avoid the situation that the high-voltage insulating film 301 is contacted and damaged, so as to ensure that the electrical clearance and creepage distance requirements for high voltage are met; and when a fault occurs in the circuit, it does not prevent the static contact from penetrating the high-voltage insulating film to guide the transfer of short-circuit current. The design structure is simple, and the electrical performance and reliability are improved.

[0115] A puncturing member 226 is provided on the repulsive static contact near the third contact point 223. The puncturing member 226 has a left-right symmetric sharp part 226a. The sharp part 226a of the puncturing member 226 is higher than the third contact point 223. When the repulsive static contact 122 is repelled, the sharp part 226a contacts the insulating layer 300 before the third contact point 223.

[0116] Specifically, when making a normal electrical connection or disconnection, the moving contact 210 and the repulsive static contact 122 are driven by the operating mechanism 260 to achieve electrical connection or disconnection. When overloaded, the operating mechanism 260 is unlocked by the overload protection device 240 of the circuit breaker to achieve electrical disconnection. When the short-circuit current is about 10In, the repulsive static contact 122 has not reached the repulsive degree, and the operating mechanism 260 is unlocked by the instantaneous protection release of the circuit breaker to achieve electrical disconnection.

[0117] During the above electrical connection or disconnection process, the current always flows through the first terminal 270 → the repulsive static contact 122 → the moving contact 210 → the conductor 282 → the second terminal 280 to form a loop. The arc generated by the disconnection of the moving contact 210 and the repulsive static contact 122 is extinguished through the arc extinguishing chamber 230 and the large opening distance between the moving contact 210 and the repulsive static contact 122. Usually, the arc energy generated by the disconnection under these conditions is relatively low, and the circuit can be quickly disconnected by the structure of the circuit breaker itself.

[0118] In this embodiment, as Figure 8As shown, when both the moving contact 210 and the repulsive static contact 122 are repelled by the electromagnetic field of a large current, at least 30% or more of the current passes through the loop of the fuse 250. After the moving contact 210 is first repelled, the repulsive static contact 122 then makes contact with the second conductive end 252 of the fuse 250. When the moving contact 210 and the repulsive static contact 122 are in contact, the current directions between the first conductor segment 210a on the moving contact 210 and the second conductor segment 220a of the repulsive static contact 122 are opposite, and the current directions between the third conductor segment 270a on the first terminal 270 and the fourth conductor segment 220b of the repulsive static contact 122 are opposite. The structure is designed to form a reverse current segment when conducting, and repulsion can be achieved by using the loop current.

[0119] When a fault short-circuit large current far greater than 10In appears in the circuit, the distance between the contact position 221a of the moving contact 210 on the alloy contact 221 of the repulsive static contact 122 and its rotation center is much greater than the distance from the contact position 221a to the rotation fulcrum 224 of the repulsive static contact 122. The repulsive moment generated by the resultant force of the Holm force generated by the current contraction at the contact position and the repulsive force generated by the reverse current flowing through the moving contact 210 and the repulsive static contact 122 on the moving contact 210 is much greater than that of the repulsive static contact 122. Under the action of the double electric repulsive force, the repulsive static contact 122 provides a greater rotational moment, providing sufficient penetration force for the piercing member 226 to ensure reliable contact between the third contact point 223 and the fourth contact point 253 when a large fault current flows through.

[0120] When the moving contact 210 separates from the repulsive static contact 122 first, in this fault current situation, the instantaneous protection mechanism of the circuit breaker will also act to unlock the operating mechanism 260. Driven by the operating mechanism 260, the moving contact 210 will separate from the repulsive static contact 122 faster. Therefore, the arc generated by the separation of the moving contact 210 and the repulsive static contact 122 will be thrown into the arc extinguishing chamber 230 under the action of the magnetic field. The loop of the first terminal 270 → repulsive static contact 122 → arc extinguishing chamber 230 → moving contact 210 → conductor 282 → second terminal 280 shares less than 30% of the arc energy of the entire loop. At the same time, the repulsive static contact 122 will also be repelled and rotated, and the sharp part 226a of the piercing member 226 pierces the high-voltage insulating film 301, so that the third contact point 223 passes through the high-voltage insulating film 301 to contact the fourth contact point 253, thereby transferring the large short-circuit fault current from the circuit breaker loop to the fuse loop. The loop of the first terminal 270 → repulsive static contact 122 → fuse 250 → conductor 282 → second terminal 280 shares more than 30% of the arc energy of the entire loop. At this time, the fuse 250 is used to achieve fast current limiting, realizing the breaking and protection of large current faults under extra-high voltage. By incorporating the fuse 250 into the loop, there is no need to configure a fuse 250 with a higher rated current. At the same time, the heat source of the fuse 250 is removed, reducing power consumption, and there is no need to add additional cooling facilities in the equipment, greatly reducing costs.

[0121] When the moving contact 210 and the repulsive static contact 122 are electrically connected, the current does not pass through the loop of the fuse 250. At this time, the current does not reach the requirement for the repulsive static contact 122 to separate and be connected to the fuse. That is to say, the fuse does not pass current during normal current operation, so the fuse 250 has no metallurgical effect and ensures that the characteristics do not change. On the other hand, there is no temperature rise. By having the fuse 250 operate in two different states under normal current and fault current conditions, the fuse 250 is used to achieve fast current limiting, realizing the breaking and protection of large current faults under extra-high voltage, making it achieve the effect of double complementary advantages and realizing the ability of the molded case circuit breaker to break more than 100 kA at DC 2500V.

[0122] Second Embodiment:

[0123] As Figures 12 - 13As shown, the difference between this embodiment and the first embodiment is that the repulsive static contact 122 further includes a rotatable fourth contact 400. One end of the fourth contact 400 is in contact with the repulsive static contact 122, and a connecting conductive member 600 is provided at the other end of the fourth contact 400. An insulating layer 300 is also provided between the connecting conductive member 600 and the second conductive end 252 of the fuse. An insulating portion 101 is provided between the fourth contact 400 and the second conductive end 252 of the fuse 250, and a force applying member 402 (torsion spring or compression spring) is provided below the rotation center of the fourth contact 400 to keep it with a counterclockwise rotation torque. When the circuit breaker is in a normal circuit, the current flows through the first terminal 270 → repulsive static contact 122 → moving contact 210 → conductor 282 → second terminal 280 to form a loop; when the circuit breaker is in a faulty circuit, the repulsive static contact 122 rotates under the repulsive force. During its rotation process, it drives the fourth contact 400 to rotate around its rotation axis 401 to overcome the torque of the force applying member 402, so that the piercing member 226 at its end penetrates the insulating layer 300, so that the connecting conductive member 600 on the fourth contact 400 is in contact and conducts with the second conductive end 252 of the fuse 250, and guides the short-circuit current to the fuse loop.

[0124] The action of the repulsive static contact 122 depends on the circuit current. When the current is normal or a large short-circuit current, the repulsive static contact 122 is not repelled, and only the moving contact 210 and the arc extinguishing chamber 230 are used for opening and protection. When there is an extremely large fault short circuit, the short-circuit current flows through the first terminal 270, and a strong electrodynamic force is formed between the moving contact and the repulsive static contact 122, and between the first incoming terminal 270 and the repulsive static contact 122. The repulsive static contact 122 is repelled and the switching is completed in milliseconds, guiding the short-circuit current to transfer to the fuse branch, and using the fuse to fuse to achieve the purpose of rapid current limiting.

[0125] Third Embodiment:

[0126] As Figures 14 - 16 shown, the difference between this embodiment and the first embodiment is that the static contact is a fixed static contact 121, a flexible conductor 1211 is provided on the fixed static contact 121, a first extended conductor 271 is provided on the first terminal 270, and the first extended conductor 271 is connected to the fixed static contact 121 through the flexible conductor 1211. One end of the fixed static contact 121 is directly welded to the flexible conductor 1211, and the flexible conductor and the first extended conductor 271 form a repulsive force structure. A connecting conductive member 600 is provided on the flexible conductor 1211. The connecting conductive member 600 is in a long strip shape. In other embodiments, the connecting conductive member 600 can also be square, circular or any combination of the above shapes.

[0127] The other end of the fixed static contact 121 is provided with an alloy contact 221 which is connected to the moving contact 210. The rear end of the connecting conductive member 600 is provided with a sixth contact point 6000. A fourth contact point 253 is provided on the second conductive end 252 of the fuse 250. The sixth contact point 6000 is correspondingly arranged with the fourth contact point 253 on the fuse. The fuse 250 is arranged in front of the connecting conductive member 600. A piercing member 226 is arranged around the sixth contact point 6000. The connecting conductive member 600 passes through the bracket 277. An elastic member (not shown) is arranged between the flexible conductor 1211 and the bracket 277 and is sleeved on the connecting conductive member 600. The connecting conductive member 600 can move in the cavity of the bracket 277. Under the action of the elastic member, the connecting conductive member 600 maintains an insulating distance from the second conductive end 252 of the fuse in the absence of a short-circuit current. An arc guide piece 279 is arranged in front of the alloy contact 221, and a magnetic flux enhancing piece 278 is arranged around the alloy contact. Particularly, a reverse structure can be formed when current passes between the first terminal 270 and the flexible conductor 1211. When the circuit breaker is in a normal circuit, the current flows through the first terminal 270 → the flexible conductor 1211 → the fixed static contact 121 → the moving contact 210 → the conductive body 282 → the second terminal 280 to form a loop. When the circuit breaker is in a faulty circuit, the moving contact 210 is repelled and arcs under the action of the Holm force and the electro-dynamic repulsive force of the fixed static contact 121. Under the action of the magnetic flux enhancing piece 278 and the arc guide piece 279, the arc is accelerated to transfer to the arc extinguishing chamber 230. At the same time, the connecting conductive member 600 is repelled under the repulsive force of the first terminal 270 and moves in the cavity of the bracket 277, overcoming the reaction force of the elastic member, and then driving the piercing member 226 to penetrate the insulating layer 300, so that the sixth contact point 6000 is conducted with the second conductive end 252 of the fuse 250, guiding the short-circuit current to the fuse loop, and achieving the purpose of rapid current limiting by fusing the fuse. The fuse realizes the interruption and protection of large current faults under extra-high voltage through rapid current limiting.

[0128] Fourth Embodiment:

[0129] As Figure 17 and Figure 18 shown, the difference between this embodiment and the first embodiment is that when a large current passes through, the second conductive end 252 of the fuse 250 is arc-connected to the first extension conductor 271 of the first terminal. An arc guide piece 279 is arranged above the fuse 250. The arc guide piece 279 extends along the length direction of the fuse 250, and one end extends to be close to the connecting conductive member 600, and the other end is bent downward to be connected to the first conductive end 251, which can achieve the same technical effect as in the first embodiment.

[0130] Specifically, one end of the repulsive static contact 122 is provided with an alloy contact 221 in contact with the moving contact, and the other end is provided with a connecting conductor 600 and a first contact point 1000. The first terminal is provided with a first extended conductor 271, and a second contact point 2000 is provided on the first extended conductor 271. The first contact point 1000 and the second contact point 2000 are correspondingly arranged. When a large current passes through, the connecting conductor 600 is repelled, and the first extended conductor 271 is connected to the second conductive end 252 of the fuse through an arc. The first conductive end 251 of the fuse is connected to the connecting conductor 600 through the arc guiding piece 279, and an arc is generated between the first contact point 1000 and the second contact point 2000. The fuse 250 is integrated inside the circuit breaker, and when installed in the high-voltage box, it can save space. And the fuse 250 only participates in the breaking of an extremely large short-circuit current. Under normal current conditions, the fuse 250 does not work and there is no current inside the fuse 250, which can effectively reduce power consumption and heat generation. Only the fuse is arranged in the bottom space, and the fuse wire inside the fuse melts under the condition of a large current, instantly cutting off the circuit and achieving fast and reliable arc extinguishing.

[0131] In an alternative solution of this embodiment, it further includes an insulating partition 500. The insulating partition 500 is arranged between the repulsive static contact 122 and the fuse 250. When an extremely large short-circuit current passes through, the repulsive static contact 122 is repelled, and an arc is generated between the repulsive static contact 122 and the first extended conductor 271 of the first terminal 270. The repulsive static contact 122 drives the insulating partition 500 to rotate, and then the insulating partition 500 can be rotatably inserted between the repulsive static contact 122 and the first extended conductor 271 of the first terminal 270, increasing the dielectric strength between the repulsive static contact 122 and the first extended conductor 271 of the first terminal 270, forcing the arc to enter the fuse 250 and then reach the arc guiding piece 279 above the fuse, and then return to the repulsive static contact 122 in the repelled state through the arc guiding piece 279, and then flow out from the second terminal 280 through the arc extinguishing chamber 230 and the moving contact 210, increasing the arc extinguishing loop, avoiding continuous arcing between the second contact point 2000 on the first terminal and the first contact point 1000 on the repulsive static contact 122, and achieving the effect of faster arc extinguishing.

[0132] Fifth Embodiment:

[0133] As Figure 19 and Figure 20As shown in the figure, the difference between this embodiment and the first embodiment is that the static contact includes a non - movable fixed static contact 121 and a rotatable repulsive static contact 122. When the fixed static contact 121 passes through a short - circuit current, it will be repelled by the Lorentz force and then generate a first break. When a short - circuit current occurs, the repulsive static contact 122 is repelled by the electromagnetic repulsion force to generate a second break. Both the first break and the second break are air breaks. The opening distance of the first break is a large opening distance, and the opening distance of the second break is a small opening distance.

[0134] In this embodiment, the fuse connecting device 290 includes a first conductor 11 and a second conductor 12 with opposite current directions, and a connecting conductive member 600. The connecting conductive member 600 is arranged around the second break. A pre - pressure device 800 is arranged on the connecting conductive member 600. The pre - pressure device 800 includes a torsion spring or a compression spring, so that the connecting conductive member 600 maintains a moment of rotation towards the first conductor 11. An insulating member 152 can be arranged between the fourth contact part 114 of the first conductor and the fifth contact part 605 of the connecting conductive member. The connecting conductive member 600 is connected to the second conductive end 252 of the fuse through a sixth flexible conductor 1226. A connecting conductor 1227 is connected between the first conductive end 251 of the fuse and the repulsive static contact 122. The connecting conductor is a flexible conductor. The second conductor 12 is arranged on the repulsive static contact 122. One end of the second conductor is provided with a first contact part, and the other end is provided with a second contact part. A moving fulcrum 1221 is arranged between the first contact part and the second contact part.

[0135] When the circuit breaker is in a normal circuit, the current flows through the first terminal 270→the first conductor 11→the second conductor 12→the repulsive static contact 122→the moving contact 210→the conductor 282→the second terminal 280 to form a loop; when the circuit breaker is in a faulty circuit, the repulsive static contact 122 rotates under the action of the repulsive force. During its rotation, it drives the insulating member 152 to rotate. The other end 1522 of the insulating member 152 moves away from between the first conductor 11 and the connecting conductive member 600, and the connecting conductive member 600 contacts the first conductor 11, so that the first conductor 11 is conducted with the second conductive end 252 of the fuse 250, guiding the short - circuit current to the fuse loop. The current flows through the first terminal 270→the first conductor 11→the connecting conductive member 600→the sixth flexible conductor 1226→the fuse 250→the seventh flexible conductor 1227→the second conductor 12→the repulsive static contact 122→the moving contact 210→the conductor 282→the second terminal 280 to form a loop.

[0136] Sixth Embodiment:

[0137] As Figure 21As shown, the difference between this embodiment and the first embodiment is that the fuse connecting device 290 includes a first extended conductor 271, an eighth flexible conductor 273, a repulsive static contact 122, two first conductors 11 and a second conductor 12 with opposite current directions, a connecting conductive part 600 and a sixth flexible conductor 1226. The first conductor 11 is connected to the first extended conductor 271 of the first terminal through the eighth flexible conductor 273. The connecting conductive part 600 is arranged below the repulsive static contact 122. The first conductor 11 is arranged adjacent to the connecting conductive part 600 in an insulated manner. An insulating part 152 is arranged between the first conductor 11 and the connecting conductive part 600. The connecting conductive part 600 is connected to the second conductive end 252 of the fuse through the sixth flexible conductor 1226.

[0138] When the circuit breaker is in a normal circuit, the current flows through the first terminal 270 → the eighth flexible conductor 273 → the first conductor 11 → the second conductor 12 → the repulsive static contact 122 → the moving contact 210 → the conductor 282 → the second terminal 280 to form a loop. When the circuit breaker is in a faulty circuit, the repulsive static contact 122 rotates under the action of repulsive force. During its rotation, the insulating part 152 is driven to rotate. The other end 1522 of the insulating part 152 moves away from between the first conductor 11 and the connecting conductive part 600. A pre-pressure device 800 is arranged above the rotation center of the connecting conductive part 600. The pre-pressure device includes a compression spring. The connecting conductive part 600 rotates towards the first conductor 11 under the action of the pre-pressure device 800 to ensure reliable contact between one end of the connecting conductive part 600 and the first conductor 11, so that the first conductor 11 is conducted with the second conductive end 252 of the fuse 250, guiding the short-circuit current to the fuse loop. The first conductive end 251 of the fuse is connected to the repulsive static contact 122 through a seventh flexible conductor 1227. The current flows through the first terminal 270 → the eighth flexible conductor 273 → the first conductor 11 → the connecting conductive part 600 → the sixth flexible conductor 1226 → the fuse 250 → the seventh flexible conductor 1227 → the second conductor 12 → the repulsive static contact 122 → the moving contact 210 → the conductor 282 → the second terminal 280 to form a loop. In this way, the fuse 250 is connected in series to the loop through a simple fuse connecting device 290. A new break is added to the loop. In particular, the breaking capacity of the fuse is higher, and at the same time, the breaking voltage will be higher, dividing the high voltage. The energy borne by each break is reduced, realizing fast and reliable breaking.

[0139] Seventh Embodiment:

[0140] As Figure 22As shown, the difference between this embodiment and the fourth embodiment is that a repulsive conductor 272 is provided inside the circuit breaker. The repulsive conductor 272 is connected to the first extended conductor 271 of the first terminal. A fifth contact point 5000 is provided on the repulsive conductor 272, and the fifth contact point 5000 is correspondingly arranged with the first contact point 1000 of the repulsive static contact 122. The fuse 250 is arranged in front of the first contact point 1000. In order to quickly open between the moving contact 210 and the repulsive static contact 122 when a large fault current passes through, quickly repel between the repulsive static contact 122 and the repulsive conductor 272, and increase the force and speed during repulsion, so as to facilitate rapid protection using the fuse 250 during a fault, the moving contact 101 and the repulsive conductor 272 are of a large-current repulsive structure. With this arrangement, the repulsive conductor 272, the repulsive static contact 122, and the moving contact 210 can all be quickly repelled, the fuse is connected in series to work, the new break in the circuit, especially the fuse, has stronger current limiting ability, faster arc extinguishing, higher breaking capacity, and at the same time, the breaking voltage will be higher, making the arc break faster.

[0141] Eighth Embodiment:

[0142] As Figure 23 shown, the difference between this embodiment and the first embodiment is that the static contact is a fixed static contact 121. One end of the fixed static contact 121 is provided with an alloy contact 221 in contact with the moving contact 210. The first conductive end 251 of the fuse is arranged on the conductive part between the fixed static contact 121 and the first terminal 270. The second conductive end 252 of the fuse is insulated and arranged around a connecting conductive part 600 arranged on the reverse current repulsive force-shaped loop formed by the rear conductive body 2101 of the moving contact and the second extended conductor 281 of the second terminal. One end of the connecting conductive part 600 is provided with a third soft conductor 603, and the other end is provided with a fourth soft conductor 604. The third soft conductor 603 is connected to the rear conductive body 2101 of the moving contact, and the fourth soft conductor 604 is connected to the second extended conductor 281 of the second terminal. After the connecting conductive part 600 is repelled, it is connected to the second conductive end 252 of the fuse.

[0143] The first terminal 270 and the fixed static contact 121 are integrated, which can separate the circuit breaker layer and the fuse layer, achieving better sealing and insulation. This shunt technology of circuit breaker + fuse effectively improves the utilization rate of the circuit breaker and the fuse. During normal operation or in the case of a very small short-circuit current, the circuit breaker is used for multiple protections without the participation of the fuse. Only when a large fault short-circuit current occurs does the fuse cooperate with the circuit breaker for system protection at the same time. This combined mode improves the rationality and reliability of the system, and at the same time reduces the workload of system operation and maintenance.

[0144] Ninth Embodiment:

[0145] As Figure 24 shown, the difference between this embodiment and the third embodiment is that the static contact is a repulsive static contact 122. One end of the repulsive static contact 122 is provided with an alloy contact 221 in contact with the moving contact, and the other end is provided with a fifth soft conductor 1225. One end of the fifth soft conductor 1225 is connected to the first connection terminal 270. The first connection terminal is provided with a first extension conductor 271. The fifth soft conductor 1225 and the first extension conductor 271 form a repulsive force structure. A connection conductive part 600 is provided on the fifth soft conductor 1225. After the connection conductive part 600 is repelled, the sixth contact point 6000 contacts the fourth contact point 253, so as to realize the connection between the connection conductive part 600 and the second conductive end 252 of the fuse, direct the short-circuit current to the fuse circuit, and utilize the characteristics of the fuse with stronger current-limiting ability, faster arc extinguishing and higher breaking ability. By adding a break in the circuit through the fuse, rapid and reliable breaking is realized.

[0146] Tenth Embodiment:

[0147] As Figure 25As shown, the difference between this embodiment and the fifth embodiment lies in that when there is no short-circuit fault current, the fuse 250 allows a current smaller than the current passing through the moving contact to pass. Specifically, a resistor 130 is disposed inside the circuit breaker. One end of the resistor 130 is connected to the connecting conductive member 600, and the other end is connected to the second conductive end 252 of the fuse. The connecting conductive member 600 is kept in contact with the first conductor 11 under the action of the pre-pressure device 800. When the circuit breaker is in a normal circuit, since a resistor 130 with a relatively large resistance value is connected in series in the fuse 250 branch, most of the current flows through the first terminal 270 → the first conductor 11 → the fixed static contact 121 → the moving contact 210 → the conductor 282 → the second terminal 280 to form a loop, and a small part of the current flows through the first terminal 270 → the connecting conductive member 600 → the fuse 250 → the first conductor 11 → the fixed static contact 121 → the moving contact 210 → the conductor 282 → the second terminal 280 to form a loop. Therefore, the current value flowing through the fuse 250 is smaller than the current value on the moving contact 210, and the current value flowing through the fuse 250 does not reach the rated value of the fuse 250 for breaking the fault current. The fuse 250 does not participate in the breaking of the low overload fault current, and the rapid disconnection of the circuit can be completely achieved through the structure of the circuit breaker itself; when the circuit breaker passes through a large fault short-circuit current, the first conductor 11 and the second conductor 12 are two conductors with opposite current directions. The second conductor 12 is repelled, and the large fault short-circuit current is transferred from the circuit breaker loop to the fuse loop. The current flows through the first terminal 270 → the first conductor 11 → the connecting conductive member 600 → the resistor 130 → the fuse 250 → the second conductor 12 → the repelling static contact 122 → the moving contact 210 → the conductor 282 → the second terminal 280 loop. At this time, the fuse 250 is used to achieve rapid current limiting, and large current fault breaking and protection under extra-high voltage are realized.

[0148] In other preferred embodiments, as Figure 26 shown, the fuse 250 is disposed in front of or above the front of the operating mechanism 260, the moving contact 210, and the overload protection device 240. As Figure 27 shown, the fuse 250 is disposed behind or above the rear of the operating mechanism 260, the moving contact 210, and the overload protection device 240. As Figure 28 shown, the fuse 250 is disposed on the left or right of the operating mechanism 260, the moving contact 210, and the overload protection device 240, or one is disposed on each of the left and right sides.

[0149] In other embodiments, as Figure 29As shown, the fuse 250 is insulatingly disposed below the operating mechanism 260 and / or the moving contact 210 and / or the overload protection device 240 in the width direction. An insulating cover 120 is provided between the fuse 250 and the base 110 in the insulating housing 100. The insulating cover 120 insulatively separates the fuses 250 corresponding to each phase / pole. One end of the fuses 250 corresponding to each phase / pole is connected to the first terminal 270 through a fuse connecting device 290, and the other end is connected to the repelling static contact 122 or the fixed static contact 121, forming a loop in which the fuse 250 is connected in series.

[0150] The present invention may be embodied in other specific forms without departing from its spirit and essential characteristics. The current embodiments are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and all changes falling within the meaning and equivalents of the claims are therefore included in the scope of the present invention.

Claims

1. An electrical integrated protection appliance, at least comprising a circuit breaker, at least one fuse and other components. The circuit breaker at least comprises an insulating housing, a moving contact, at least one static contact, an arc extinguishing chamber, an operating mechanism, an overload protection device, a first terminal, a second terminal, and a fuse connecting device. The arc extinguishing chamber is arranged in front of the moving contact in the height direction. The fuse is arranged in front of or behind or to the left or right or below the operating mechanism or / and the moving contact or / and the overload protection device in the length direction or width direction or height direction in an insulated manner. When there is no short-circuit fault current, no current passes through the fuse or the current passing through the fuse is less than the current passing through the moving contact.

2. The electrical fusion protection appliance according to claim 1, characterized in that: The rated current value of the fuse is set to be less than the rated current value of the circuit breaker.

3. The electric fusion protection appliance according to claim 1, characterized in that: The static contact is a fixed static contact or / and a rotatable repulsive static contact.

4. The electric integrated protection appliance according to claim 1, characterized in that: The fuse connecting device at least comprises at least two conductors with opposite current directions arranged between the first terminal or the second terminal and the static contact and at least one connecting conductive part. At least one of the two conductors with opposite current directions is repelled by an electromagnetic repulsive force when a short-circuit current occurs, driving the connecting conductive part to connect the power supply of the first terminal or the second terminal to the fuse or to connect the repelled conductor to the fuse.

5. The electric integrated protection electrical appliance according to claim 4, characterized in that: When no short-circuit current flows through, the connecting conductive part is insulated from any one of the at least two conductors with opposite current directions or from the second conductive end of the fuse.

6. The electrical integrated protection appliance according to claim 1, wherein: The first conductive end of the fuse is directly or indirectly connected to the first terminal or the second terminal.

7. The electrical integrated protection appliance according to claim 1, characterized in that: When a short-circuit current passes through, the static contact is repelled by the Lorentz force to generate a first break. At least one of the two conductors with opposite current directions is repelled by an electromagnetic repulsive force to generate a second break when a short-circuit current occurs, and two arcs are generated simultaneously. The arc energy generated by the first break is more than 3 times that generated by the second break.

8. The electrical integrated protection appliance according to claim 7, characterized in that: For the opening distances of the two breaks generated after being repelled by the Lorentz force, the opening distance of the first break is a large opening distance, and the opening distance of the second break is a small opening distance.

9. The electrical fusion protection appliance according to claim 7, characterized in that: Both the first break and the second break are air breaks.

10. The electrical integrated protection appliance according to claim 4 or 7, characterized in that: The connecting conductive part is arranged around the first break or the second break.

11. The electric integrated protection electrical appliance according to claim 10, characterized in that: A pre-pressure device is arranged on the connecting conductive part.

12. The electrical integrated protection appliance according to claim 11, characterized in that: The pre-pressure device contains a torsion spring or a compression spring.

13. The electrical integrated protection appliance according to claim 4, characterized in that: The connecting conductive part is connected to the second conductive end of the fuse through a flexible conductor or a rigid conductor.

14. The electric integrated protection electrical appliance according to claim 3, characterized in that: A connecting conductor is connected between the first conductive end of the fuse and the repulsive static contact.

15. The electric integrated protection electrical appliance according to claim 14, characterized in that: The connecting conductor is a flexible conductor or a rigid conductor.

16. The electric integrated protection electrical appliance according to claim 1, characterized in that: The two conductors with opposite current directions include a first conductor and a second conductor. The second conductor is arranged on the static contact or is directly or indirectly connected to the static contact. A first contact part is arranged at one end of the second conductor, and a second contact part is arranged at the other end. A moving fulcrum is arranged between the first contact part and the second contact part.

17. The electrically integrated protection electrical appliance according to claim 1, characterized in that: A third contact part and a fourth contact part are arranged at one end of the first conductor, and the other end is directly or indirectly connected to the first terminal.

18. The electric fusion protection electrical appliance according to claim 4 or 17, characterized in that: One end of the connecting conductive member is provided with a fifth contact portion, which is correspondingly arranged with the fourth contact portion of the first conductor. The contact mode between the first conductor and the connecting conductive member is planar pressure contact or chuck type contact.

19. The electrical integrated protection appliance according to claim 1 or 16, characterized in that: An equipotential connecting conductor is arranged adjacent to and insulated from one end of the second conductor at the first conductive end of the fuse.

20. The electric integrated protection electrical appliance according to claim 16, characterized in that: An insulating member is arranged between the fourth contact portion of the first conductor and the fifth contact portion of the connecting conductive member.

21. The electric integrated protection electrical appliance according to claim 1 or 20, characterized in that: The connecting conductive member is arranged in front of the repulsive static contact. When a large short-circuit current passes through, the insulating member is carried away by the repulsive static contact, and the connecting conductive member connects to the power supply of the first wiring terminal or the second wiring terminal.

22. The electric integrated protection electrical appliance according to claim 1, characterized in that: When a short circuit occurs in the electric fusion protection electrical appliance, the first conductor is connected to the connecting conductive member, then connected to the fuse, then connected to the connecting conductor, then connected to the static contact, and then directly or indirectly connected to the moving contact to form a series circuit of current.

23. The electric integrated protection electrical appliance according to claim 1 or 4, characterized in that: The connecting conductive member is arranged adjacent to and insulated from the second conductive end of the fuse when no short-circuit fault current flows through.

24. The electric fusion protection electrical appliance according to claim 23, characterized in that: The connecting conductive member is driven by the electromagnetic repulsive force generated by the short-circuit current to be electrically connected to the second conductive end of the fuse.

25. The electric integrated protection electrical appliance according to claim 24, characterized in that: After the second conductive end of the fuse is connected by the connecting conductive member, a loop is formed to shunt the arc loop generated during the short-circuit protection action of the moving contact.

26. The electric integrated protection electrical appliance according to claim 1 or 6, characterized in that: The first conductive end of the fuse is arranged on the conductive member between the rear conductor of the moving contact and the second wiring terminal or on the conductive member between the static contact and the first wiring terminal.

27. The electric integrated protection electrical appliance according to claim 4, characterized in that: The connecting conductive member is arranged on the reverse current repulsive force forming loop formed by the connecting conductor between the static contact and the first extended conductor of the first wiring terminal.

28. The electric integrated protection electrical appliance according to claim 4, characterized in that: The connecting conductive member is directly arranged on the repulsive static contact.

29. The electric integrated protection electrical appliance according to claim 4, characterized in that: The connecting conductive member is arranged on the reverse current repulsive force forming loop formed by the second extended conductor between the rear conductor of the moving contact and the second wiring terminal.

30. The electrical integrated protection appliance according to claim 3, characterized in that: A soft conductor is arranged on the fixed static contact. One end of the soft conductor is connected to the first wiring terminal, and the first wiring terminal is provided with a first extended conductor. The soft conductor and the first extended conductor form a repulsive structure.

31. The electrical fusion protection appliance according to claim 30, characterized in that: The connecting conductive member is arranged on the soft conductor, and an elastic member is arranged on the connecting conductive member. Under the action of the elastic member, the connecting conductive member maintains an insulating distance from the second conductive end of the fuse when there is no short-circuit current.

32. The electric integrated protection electrical appliance according to claim 31, characterized in that: The connecting conductive member is in a long shape, square shape, circular shape or any combination of the above shapes.

33. The electrical integrated protection appliance according to claim 29, characterized in that: One end of the connecting conductive member is provided with a third soft conductor, and the other end is provided with a fourth soft conductor. The third soft conductor is connected to the rear conductor of the moving contact, and the fourth soft conductor is connected to the second extended conductor of the second wiring terminal. After the connecting conductive member is repelled, it is connected to the second conductive end of the fuse.

34. The electrical fusion protection appliance according to claim 3 or 28, characterized in that: One end of the repulsive static contact is provided with an alloy contact to contact the moving contact, and the other end is provided with a fifth soft conductor. One end of the fifth soft conductor is connected to the first wiring terminal, and the first wiring terminal is provided with a first extended conductor. The fifth soft conductor and the first extended conductor form a repulsive structure. The connecting conductive member is arranged on the fifth soft conductor. After the connecting conductive member is repelled, it is connected to the second conductive end of the fuse.

35. The electric fusion protection appliance according to claim 3 or 28, characterized in that: One end of the repulsive static contact is provided with an alloy contact for contacting the moving contact, and the other end is provided with a connecting conductive member and a first contact point. The first terminal is provided with a first extended conductor, and a second contact point is provided on the first extended conductor. The first contact point and the second contact point are arranged correspondingly. A second soft conductor is arranged around the other end of the repulsive static contact and connected to the first extended conductor. After the connecting conductive member is repelled, it is connected to the second conductive end of the fuse, and no arc is generated between the first contact point and the second contact point.

36. The electric integrated protection electrical appliance according to claim 35, characterized in that: The connecting conductive member is provided with a third contact point, and the second conductive end of the fuse is provided with a fourth contact point. The third contact point and the fourth contact point are arranged correspondingly. After the connecting conductive member is repelled, the third contact point contacts the fourth contact point, so that the connecting conductive member is connected to the second conductive end of the fuse.

37. The electric fusion protection electrical appliance according to claim 1, characterized in that: The operating mechanism drives the moving contact to make a connecting or disconnecting movement with the static contact.

38. The electric fusion protection electrical appliance according to claim 1, characterized in that: The fuse can also be arranged at a certain angle between the length and the width directions.

39. The electrical integrated protection appliance according to claim 35, characterized in that: When both the moving contact and the repulsive static contact are repelled by the electromagnetic field of a large current, at least more than 30% of the current passes through the fuse circuit.

40. The electric integrated protection electrical appliance according to claim 36, characterized in that: When both the moving contact and the repulsive static contact are repelled by the electromagnetic field of a large current, the moving contact is repelled first, and then the connecting conductive member on the repulsive static contact is connected to the second conductive end of the fuse.

41. The electric fusion protection electrical appliance according to claim 35, characterized in that: A rotation fulcrum is arranged at a non-central position between the alloy contact and the first contact point, and holes or protrusions for hanging springs are arranged around the rotation fulcrum.

42. The electrical fusion protection appliance according to claim 41, characterized in that: When the second soft conductor is connected to the first extended conductor, the repulsive static contact is arranged on the bracket through the rotation fulcrum.

43. The electrical fusion protection appliance according to claim 35, characterized in that: An insulating layer is arranged between the connecting conductive member and the second conductive end of the fuse.

44. The electrical integrated protection appliance according to claim 43, characterized in that: The insulating layer is at least one piece of high-voltage insulating film.

45. The electrical fusion protection appliance according to claim 44, characterized in that: The insulating layer further includes two insulating plates. The high-voltage insulating film is fixed between the two insulating plates, and the insulating layer is inserted into the insulating housing.

46. The electrical integrated protection appliance according to claim 43, characterized in that: The insulating layer is arranged on the connecting conductive member or / and on the second conductive end of the fuse or / and between the connecting conductive member and the second conductive end of the fuse.

47. The electrical integrated protection appliance according to claim 35, characterized in that: A puncturing member is arranged around the connecting conductive member or the second conductive end of the fuse, and the puncturing member is provided with at least one sharp part.

48. The electrical fusion protection appliance according to claim 47, characterized in that: The sharp part of the puncturing member protrudes from the end face of the connecting conductive member or the end of the second conductive end of the fuse.

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