Topological structure of zero-region transverse magnetic reinforced large-current circuit breaker and breaking method of zero-region transverse magnetic reinforced large-current circuit breaker

Abstract

In the device, a rapid vacuum switch comprises a static contact and a moving contact, the static contact and the moving contact are separated to generate plasmas, and a transverse magnetic coil abuts against the static contact and the moving contact to excite a transverse magnetic field in a contact gap so as to accelerate dissipation of the plasmas in a zero region. The transverse magnetic coils are connected in series and reused in the transfer module; the transfer module is connected in parallel with the rapid vacuum switch through the auxiliary switch; the current limiting module is connected in parallel with the transfer module. The structure can enhance the post-arc medium recovery capability of the quick vacuum switch, improves the reliability of quick breaking of fault current of a generator source, has the advantages of strong breaking capability, high breaking speed, complete environmental friendliness and the like, and can meet the operation requirements of a large power generation system.

Description

Technical Field

[0001] The invention relates to the technical field of electric power equipment, in particular to a topological structure of a zero-zone transverse magnetic enhancement type high-current circuit breaker. Background Art

[0002] The short-circuit current at the generator outlet usually contains a huge DC component, which is prone to delayed zero crossing of the current. The short-circuit current has a high peak value, which can reach a large current of 190kA or above, and has high requirements for the circuit breaker's breaking performance. The generator outlet circuit breaker is installed between the generator outlet and the step-up transformer, and is the core power equipment to ensure the safe and stable operation of the generator set. Traditional current transfer breaking technology can force the current to drop to the zero point, but under the action of high-frequency transfer current, the current change rate is very large, and the residual plasma in the zero zone is difficult to dissipate in time, which increases the probability of post-arc reignition and is not conducive to the breaking of ultra-large short-circuit currents.

[0003] The information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the invention

[0004] In view of the shortcomings or defects of the above-mentioned prior art, a topological structure of a zero-zone transverse magnetic enhanced large current circuit breaker is provided. During the rapid current transfer process, a transverse magnetic field is synchronously applied to the contact system of the fast vacuum switch to accelerate the dissipation of the residual plasma in the zero zone and improve the reliability of short-circuit current breaking. It has the advantages of large breaking capacity, high breaking reliability and fast breaking speed, and can better meet the operation requirements of large power generation systems. Large current refers to currents of 190kA and above.

[0005] The purpose of the present invention is achieved through the following technical solutions.

[0006] A topological structure of a zero-zone transverse magnetic enhancement type high current circuit breaker includes: Zero-zone transverse magnetic enhanced vacuum switch module, comprising: A fast vacuum switch includes a stationary contact and a moving contact. The stationary contact and the moving contact are separated to generate plasma. A transverse magnetic coil, which is close to the stationary contact and the moving contact to excite a transverse magnetic field in the contact gap to accelerate the dissipation of the zero-zone plasma, and the transverse magnetic coil is serially reused in the transfer module; A transfer module connected in parallel with the fast vacuum switch via an auxiliary switch; A current limiting module is connected in parallel with the transfer module.

[0007] In the topological structure of the zero-zone transverse magnetic field enhanced high-current circuit breaker, both the static contact and the moving contact are contacts with a cup-shaped longitudinal magnetic structure.

[0008] In the topological structure of the zero-zone transverse magnetic enhanced high current circuit breaker, the static contact comprises: Static conductive rod, The static end contact cup is connected to the static conductive rod, and the static end contact cup is provided with a first inclined slot inclined in a predetermined inclined direction. The static end contact piece is arranged at one end of the static end contact cup relative to the static conductive rod, The moving contact includes: Moving conductive rod, The movable end contact cup is connected to the movable conductive rod, and the movable end contact cup is provided with a second inclined slot inclined toward the predetermined inclined direction. The moving end contact piece is arranged at one end of the moving end contact cup relative to the moving conductive rod. The moving end contact piece and the static end contact piece switch between contact and separation. When current flows through the static end contact cup, the vacuum arc and the moving end contact cup, a longitudinal magnetic field that diffuses the vacuum arc is generated in the gap between the static contact and the moving contact.

[0009] In the topological structure of the zero-zone transverse magnetic enhanced high-current circuit breaker, the transfer module includes a transfer capacitor and a transfer inductor connected in series at one end of the transverse magnetic coil and a thyristor assembly provided at the other end of the transverse magnetic coil, and the thyristor assembly includes a thyristor T1 and a thyristor T2 connected in reverse parallel.

[0010] In the topological structure of the zero-zone transverse magnetic enhanced high-current circuit breaker, the fast vacuum switch is driven by a fast operating mechanism, and the fast operating mechanism includes an electromagnetic operating mechanism and a spring operating mechanism.

[0011] In the topological structure of the zero-zone transverse magnetic enhanced high-current circuit breaker, the current-limiting resistor includes any one of a ceramic resistor, an aluminum shell resistor, and a cement resistor, or a combination of multiple thereof.

[0012] In the topological structure of the zero-zone transverse magnetic enhanced high-current circuit breaker, the auxiliary switch includes any one of a vacuum switch, an air switch, and a power electronic switch, or a combination of multiple thereof.

[0013] The breaking method of the topological structure of the zero-zone transverse magnetic enhanced high current circuit breaker includes the following steps: Step S100: When the fault current drops to a first characteristic value, a tripping instruction is sent to the fast vacuum switch; Step S200: When the fault current drops to the second characteristic value, the thyristor assembly is triggered, and the transfer module releases the transfer current to the fast vacuum switch, the current of the fast vacuum switch drops rapidly, the DC component decays, and an artificial zero crossing point is created. At the same time, the transfer current flows through the transverse magnetic coil, and a transverse magnetic field is synchronously applied to the contact gap of the fast vacuum switch to accelerate the dissipation of the residual plasma in the zero zone and enhance the recovery ability of the medium after the arc. Step S300: The fast vacuum switch is disconnected at zero crossing, the thyristor assembly is cut off at zero crossing, the fault current is limited by the current limiting module, and a tripping instruction is sent to the auxiliary switch to complete the fault current interruption.

[0014] A computer storage medium includes computer instructions, which, when executed on a computer, cause the computer to execute the method described.

[0015] An electronic device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the method described is implemented.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention controls the action of the fast vacuum switch, and then triggers the transfer module according to a specific timing to achieve rapid current transfer, zero-zone transverse magnetic enhancement of zero crossing and current limiting, and finally completes fault current interruption. The fast limitation and interruption of the delayed zero crossing of the generator source short-circuit current is achieved. During the rapid current transfer process, a transverse magnetic coil is used to apply a transverse magnetic field to the contact gap of the fast vacuum switch, which accelerates the dissipation of the residual plasma in the zero zone and enhances the tolerance of the transient recovery voltage after the arc. The fast vacuum breaking technology is used to replace the traditional SF6 breaking technology, which is completely environmentally friendly.

[0017] The above description is only an overview of the technical solution of the present invention. In order to make the technical means of the present invention clearer and to achieve the extent that those skilled in the art can implement it according to the contents of the specification, and in order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are exemplified below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By reading the detailed description of the preferred specific embodiments below, various other advantages and benefits of the present invention will become clear to those of ordinary skill in the art. The drawings in the specification are only for the purpose of illustrating the preferred embodiments and are not considered to be limitations of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative work. Moreover, the same reference numerals are used to represent the same components throughout the drawings.

[0019] In the attached picture: Figure 1 It is a schematic diagram of a topological structure of a circuit breaker for delayed zero crossing of large current provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of a cup-shaped contact structure of a fast vacuum switch and its self-generated longitudinal magnetic field provided by an embodiment of the present invention; FIG3( a ) is a schematic diagram of flow through a fast vacuum switch provided by an embodiment of the present invention when the contacts are closed; FIG3( b ) is a schematic diagram of a fast vacuum switch provided by an embodiment of the present invention generating a vacuum arc after the contacts are opened; FIG3( c ) is a schematic diagram of the movement of a vacuum arc after a transverse magnetic field is applied to the contact gap of a fast vacuum switch provided by an embodiment of the present invention; Figure 4(a) is Figure 1 The normal current-carrying phase of the circuit breaker shown; Figure 4(b) is Figure 1 The circuit breaker shown is in the arc starting and zero-crossing phases of the transfer; Figure 4(c) is Figure 1 The current limiting stage of the circuit breaker shown; Figure 4(d) is Figure 1 The successful breaking stage of the circuit breaker is shown; Figure 5 yes Figure 1 The waveform diagram of the circuit breaker breaking the forward short-circuit current is shown; Figure 6 yes Figure 1 The waveform diagram of the reverse short-circuit current interrupted by the circuit breaker is shown; Figure 7 It is a schematic diagram of a topological structure based on parallel connection of multiple vacuum breaks provided by another embodiment of the present invention.

[0020] The present invention is further explained below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0021] The specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the specific embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0022] It should be noted that certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that technicians may use different nouns to refer to the same component. This specification and claims do not use the difference in nouns as a way to distinguish components, but use the difference in the functions of the components as the criterion for distinction. As mentioned throughout the specification and claims, "including" or "comprising" is an open term, so it should be interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment of the present invention, but the description is based on the general principles of the specification and is not intended to limit the scope of the present invention. The scope of protection of the present invention shall be determined by the attached claims.

[0023] To facilitate understanding of the embodiments of the present invention, several specific embodiments will be further explained below with reference to the accompanying drawings, and each of the accompanying drawings does not constitute a limitation on the embodiments of the present invention.

[0024] For a better understanding, Figures 1 to 7 As shown, a topological structure of a zero-zone transverse magnetic enhancement type high current circuit breaker includes: Zero-zone transverse magnetic enhanced vacuum switch module, comprising: A fast vacuum switch includes a stationary contact and a moving contact. The stationary contact and the moving contact are separated to generate plasma. A transverse magnetic coil, which is close to the stationary contact and the moving contact to excite a transverse magnetic field in the contact gap to accelerate the dissipation of the zero-zone plasma, and the transverse magnetic coil is serially reused in the transfer module; A transfer module connected in parallel with the fast vacuum switch via an auxiliary switch; A current limiting module is connected in parallel with the transfer module.

[0025] In a preferred embodiment of the topological structure of the zero-zone transverse magnetic field enhanced high-current circuit breaker, both the static contact and the moving contact adopt cup-shaped longitudinal magnetic structure contacts.

[0026] In the preferred embodiment of the topological structure of the zero-zone transverse magnetic enhancement type high current circuit breaker, the static contact comprises: Static conductive rod, The static end contact cup is connected to the static conductive rod, and the static end contact cup is provided with a first inclined slot inclined in a predetermined inclined direction. The static end contact piece is arranged at one end of the static end contact cup relative to the static conductive rod, The moving contact includes: Moving conductive rod, The movable end contact cup is connected to the movable conductive rod, and the movable end contact cup is provided with a second inclined slot inclined toward the predetermined inclined direction. The moving end contact piece is arranged at one end of the moving end contact cup relative to the moving conductive rod. The moving end contact piece and the static end contact piece switch between contact and separation. When current flows through the static end contact cup, the vacuum arc and the moving end contact cup, a longitudinal magnetic field that diffuses the vacuum arc is generated in the gap between the static contact and the moving contact.

[0027] In a preferred embodiment of the topological structure of the zero-zone transverse magnetic enhanced high-current circuit breaker, the transfer module includes a transfer capacitor and a transfer inductor connected in series at one end of the transverse magnetic coil and a thyristor assembly provided at the other end of the transverse magnetic coil, and the thyristor assembly includes a thyristor T1 and a thyristor T2 connected in reverse parallel.

[0028] In a preferred embodiment of the topological structure of the zero-zone transverse magnetic enhanced high-current circuit breaker, the fast vacuum switch is driven via a fast operating mechanism, and the fast operating mechanism includes an electromagnetic operating mechanism and a spring operating mechanism.

[0029] In a preferred embodiment of the topological structure of the zero-zone transverse magnetic enhanced high-current circuit breaker, the current-limiting resistor includes any one of a ceramic resistor, an aluminum shell resistor, and a cement resistor, or a combination of multiple thereof.

[0030] In a preferred embodiment of the topological structure of the zero-zone transverse magnetically enhanced high-current circuit breaker, the auxiliary switch includes any one of a vacuum switch, an air switch, and a power electronic switch, or a combination of multiple thereof.

[0031] The breaking method of the topological structure of the zero-zone transverse magnetic enhanced high current circuit breaker includes the following steps: Step S100: When the fault current drops to a first characteristic value, a tripping instruction is sent to the fast vacuum switch; Step S200: When the fault current drops to the second characteristic value, the thyristor assembly is triggered, and the transfer module releases the transfer current to the fast vacuum switch, the current of the fast vacuum switch drops rapidly, the DC component decays, and an artificial zero crossing point is created. At the same time, the transfer current flows through the transverse magnetic coil, and a transverse magnetic field is synchronously applied to the contact gap of the fast vacuum switch to accelerate the dissipation of the residual plasma in the zero zone and enhance the recovery ability of the medium after the arc. Step S300: The fast vacuum switch is disconnected at zero crossing, the thyristor assembly is cut off at zero crossing, the fault current is limited by the current limiting module, and a tripping instruction is sent to the auxiliary switch to complete the fault current interruption.

[0032] A computer storage medium includes computer instructions, which, when executed on a computer, cause the computer to execute the method described.

[0033] An electronic device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the method described is implemented.

[0034] In one embodiment, a topological structure of a zero-zone transverse magnetic enhanced high current circuit breaker includes: Zero-zone transverse magnetic enhanced vacuum switch module, comprising: A fast vacuum switch comprises a static contact and a moving contact, wherein the static contact and the moving contact adopt a cup-shaped longitudinal magnetic structure. A transverse magnetic coil, which is close to the contact system of the fast vacuum switch and is serially multiplexed in the transfer module; A transfer module connected in parallel with the fast vacuum switch via an auxiliary switch; The current limiting module is connected in parallel with the transfer module. After the fast vacuum switch is forced to transfer through zero, due to the extremely high rate of change of the current before zero, the residual plasma in the contact gap does not have time to completely dissipate, which reduces the recovery capacity of the dielectric after the arc, and is easily broken down and reignited by the transient recovery voltage. The topological structure of this zero-zone transverse magnetic enhanced high-current circuit breaker can accelerate the dissipation speed of the residual plasma in the zero zone, enhance the dielectric recovery capacity of the fast vacuum switch after forced zero crossing, improve the breaking reliability of the traditional current transfer circuit breaker, and meet the protection needs at the outlet of large generators.

[0035] In a preferred embodiment of the topological structure, the transverse magnetic coil is serially reused in a loop formed by a transfer capacitor, a transfer inductor and a thyristor assembly, and can reuse the transfer current to apply a transverse magnetic field in a contact system of a fast vacuum switch.

[0036] The breaking method of the topological structure of the zero-zone transverse magnetic enhanced high current circuit breaker comprises the following steps: Step S100: When the fault current drops to a first characteristic value, a tripping instruction is sent to the fast vacuum switch S1; Step S200: When the fault current drops to the second characteristic value, the thyristor assembly is triggered, and the transfer module releases the transfer current to the fast vacuum switch S1. The current of the fast vacuum switch S1 drops rapidly, and the DC component decays, creating an artificial zero crossing. At the same time, the transfer current flows through the transverse magnetic coil L1, and a transverse magnetic field is synchronously applied to the contact gap of the fast vacuum switch S1, accelerating the dissipation of the residual plasma in the zero zone and enhancing the recovery ability of the medium after the arc. Step S300: the fast vacuum switch S1 is disconnected at zero crossing, the thyristor assembly is cut off at zero crossing, the fault current is limited by the current limiting module, and a tripping instruction is sent to the auxiliary switch S2 to complete the fault current interruption.

[0037] In the preferred embodiment of the breaking method, in step S100, when the fault current drops to the first characteristic value, a tripping command is sent to the fast vacuum switch S1. The first characteristic value ensures that the moving contact and the static contact of the fast vacuum switch reach a certain opening distance when the current transfers through zero, and cooperates with the transverse magnetic field in the zero zone to withstand the transient recovery voltage after the arc.

[0038] In the preferred embodiment of the breaking method, in step S200, when the fault current drops to the second characteristic value, a conduction instruction is sent to the thyristor assembly, and the transfer capacitor C and the inductor oscillate to generate a high-frequency transfer current. To ensure that the current of the fast vacuum switch S1 can reliably produce a zero crossing, the second characteristic value needs to be less than the peak value of the transfer current, and a margin of 5kA~10kA should be left. At the same time, considering that the action of the relay protection and the action of the power electronic device require time, the time from the second characteristic value to the minimum value of the fault current cannot be too short to ensure that the zero crossing occurs before the minimum value of the fault current.

[0039] In one embodiment, a topological structure is shown in FIG1, including a zero-zone transverse magnetic enhanced vacuum switch module, a transfer module, a current limiting module and an auxiliary switch S2. The transfer module is connected in parallel at both ends of the zero-zone transverse magnetic enhanced vacuum switch module through the auxiliary switch S2, and the current limiting module is connected in parallel at both ends of the transfer module. Among them, the zero-zone transverse magnetic enhanced vacuum switch module includes a fast vacuum switch S1 and a transverse magnetic coil L1; the transfer module includes a transfer capacitor C, a transfer inductor L2 and thyristor assemblies T1 and T2, and the transverse magnetic coil L1 is serially reused in the transfer module; the current limiting module includes a current limiting resistor R. In the embodiment of the present invention, the fast vacuum switch adopts a cup-shaped longitudinal magnetic contact, as shown in FIG2, including a static end contact cup 1, a static end contact sheet 2, a moving end contact sheet 3, a moving end contact cup 4, a static conductive rod 5 and a moving conductive rod 6. Among them, the static contact cup 1 and the moving contact cup 4 are provided with inclined grooves in the same direction. When the current flows through the "static contact cup 1-vacuum arc 8-moving contact cup 4", a longitudinal magnetic field 7 will be generated in the gap between the moving and static contacts. Under the action of the longitudinal magnetic field, the vacuum arc 8 is in a diffuse state, which can reduce the local ablation of the contact surface and is beneficial to improving the current breaking capacity of the vacuum switch.

[0040] In the embodiment of the present invention, during the current transfer process, a transverse magnetic field is applied to the contact gap of the fast vacuum switch through a transverse magnetic coil to enhance the post-arc medium recovery capability.

[0041] In the normal flow state, as shown in Figure 3(a), the moving contact and the static contact are in close contact, and the current flows from one end to the other. After the fault occurs, the fast vacuum switch receives the opening command, the moving contact starts to move, and the contact gap generates vacuum arc plasma, which is mainly composed of a large number of electrons, ions, and metal particles. Under the action of the longitudinal magnetic field generated by the contact cup, the vacuum arc is in a diffuse state, as shown in Figure 3(b). When the transfer module releases the transfer current, the current of the fast vacuum switch decreases rapidly. At the same time, the transverse magnetic coil applies a transverse magnetic field to the contact gap, driving the vacuum arc to move to one side of the contact, as shown in Figure 3(c). The microscopic particles of the plasma quickly fly away from the contact gap under the action of the transverse magnetic field, accelerating the plasma dissipation process. When the current reaches the zero point, the amount of residual plasma in the contact gap is very low, and the post-arc dielectric recovery ability of the fast vacuum switch is enhanced.

[0042] In the embodiment of the present invention, the high current circuit breaker topology structure can realize bidirectional breaking, and the breaking process of the forward breaking can be divided into four stages, as shown in Figures 4(a) to 4(d). The current waveform schematic diagram of the forward breaking process is shown in Figure 5.

[0043] Figure 4(a) shows the normal current flow stage of the circuit breaker. In this stage, the current flows into the left end of the circuit breaker and flows out from the right end after passing through the fast vacuum switch. The pre-charge polarity of the transfer capacitor C is negative on the left and positive on the right.

[0044] Figure 4(b) shows the arcing and zero-crossing stage of the circuit breaker. In this stage, the control system detects the current of the circuit in real time. When a fault condition is detected and the short-circuit current drops to the first characteristic value, the control system sends a trip command to the fast vacuum switch, and the moving and static contacts separate to generate a vacuum arc. When the short-circuit current is detected to drop to the second characteristic value, the control system triggers the thyristor T1, and the transfer capacitor C and the inductor oscillate to generate a high-frequency transfer current. The transfer current is superimposed on the fast vacuum switch S1 branch, causing the current flowing through the fast vacuum switch S1 to drop rapidly. At the same time, the transfer current flows through the transverse magnetic coil L1, applying a transverse magnetic field to the contact gap of the fast vacuum switch, accelerating the dissipation of the residual plasma in the zero zone. When the current drops to the zero point, the fast vacuum switch successfully withstands the transient recovery voltage after the arc, and the short-circuit current begins to transfer to the current limiting module.

[0045] Figure 4(c) shows the current limiting stage of the circuit breaker. In this stage, as the thyristor T1 turns off at zero crossing, the short-circuit current is completely transferred to the current limiting module. The resistance of the current limiting resistor is relatively large, which can quickly dissipate the fault energy and limit the short-circuit current to a lower level.

[0046] FIG4( d ) shows the successful opening stage of the circuit breaker. In this stage, the short-circuit current has been limited, and the control system sends a trip command to the auxiliary switch S2, successfully breaking the fault current.

[0047] Among them, the first characteristic value and the second characteristic value in the current breaking process are determined by the control strategy. The basic principle of selecting the first characteristic value is to ensure that the moving contact and the static contact of the fast vacuum switch reach a certain opening distance when the current transfers through zero, and cooperate with the transverse magnetic field in the zero zone to ensure that the transient recovery voltage after the arc can be tolerated. In the actual operation of the circuit breaker, the setting of the control parameters also needs to consider factors such as the mechanical delay of the operating mechanism; the basic principle of selecting the second characteristic value is that it needs to be less than the peak value of the transfer current. In order to ensure that the current of the fast vacuum switch S1 can reliably produce a zero point, a margin of 5kA~10kA should be left. At the same time, considering that the relay protection action and the power electronic device action require time, the time from the second characteristic value to the minimum value of the fault current cannot be too short to ensure that the zero point is generated before the minimum value of the fault current.

[0048] The circuit breaker can realize bidirectional breaking. When breaking in the reverse direction, the fault current flows in from the right end of the circuit breaker and flows out from the left end after passing through the fast vacuum switch. At this time, the pre-charge polarity of the transfer capacitor C is negative on the left and positive on the right. The transfer current generated after conduction cannot make the fast vacuum switch current pass zero. Therefore, it is necessary to trigger the thyristor T1 in advance to change the polarity of the transfer capacitor C to positive on the left and negative on the right. The subsequent control strategy and breaking principle are basically the same as those for the forward breaking, which will not be repeated here. The current waveform diagram of the reverse breaking is shown in Figure 6.

[0049] In another embodiment, the circuit breaker adopts a topological structure based on parallel connection of multiple vacuum breaks, as shown in FIG7 . The breaking capacity of a single vacuum break is much smaller than the short-circuit breaking requirement of a million-kilowatt generator outlet, and multiple vacuum breaks in parallel can effectively improve the breaking capacity of the circuit breaker. Each vacuum break is equipped with a transverse magnetic coil, and each transverse magnetic coil is connected in parallel. In order to improve the current sharing characteristics of the parallel breaks, the vacuum breaks and transverse magnetic coils used in parallel need to be products of the same model and the same batch.

[0050] In this embodiment, the application method of the circuit breaker includes the following steps: Step S100: when the fault current drops to a first characteristic value, a tripping instruction is synchronously sent to all vacuum switches of the vacuum multi-break parallel module S1; Step S200: When the fault current drops to the second characteristic value, the thyristor assembly is triggered, and the transfer module releases high-frequency transfer current to the vacuum multi-break parallel module S1, and the current of each vacuum break branch drops rapidly, and the DC component decays, creating an artificial zero point. At the same time, the transfer current flows through each transverse magnetic coil L1, and a transverse magnetic field is synchronously applied to the contact gap of each vacuum break, accelerating the dissipation of the residual plasma in the zero zone and enhancing the dielectric recovery ability of the vacuum break after the arc; Step S300: the vacuum multi-break parallel module S1 is disconnected at zero crossing, the thyristor assembly is cut off at zero crossing, the fault current is limited by the current limiting module, and a tripping instruction is sent to the auxiliary switch S2 to complete the fault current interruption.

[0051] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0052] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A topological structure of a zero-zone transverse magnetic enhancement type high current circuit breaker, characterized in that: These include, Zero-zone transverse magnetic enhanced vacuum switch module, comprising: A fast vacuum switch includes a stationary contact and a moving contact. The stationary contact and the moving contact are separated to generate plasma. A transverse magnetic coil, which is close to the stationary contact and the moving contact to excite a transverse magnetic field in the contact gap to accelerate the dissipation of the zero-zone plasma, and the transverse magnetic coil is serially reused in the transfer module; A transfer module connected in parallel with the fast vacuum switch via an auxiliary switch; A current limiting module is connected in parallel with the transfer module.

2. The topological structure of the zero-zone transverse magnetic enhanced high current circuit breaker according to claim 1, characterized in that: Preferably, both the stationary contact and the moving contact are contacts with a cup-shaped longitudinal magnetic structure.

3. The topological structure of the zero-zone transverse magnetic enhanced high current circuit breaker according to claim 2, characterized in that: The stationary contacts include: Static conductive rod, The static end contact cup is connected to the static conductive rod, and the static end contact cup is provided with a first inclined slot inclined in a predetermined inclined direction. The static end contact piece is arranged at one end of the static end contact cup relative to the static conductive rod, The moving contact includes: Moving conductive rod, The movable end contact cup is connected to the movable conductive rod, and the movable end contact cup is provided with a second inclined slot inclined toward the predetermined inclined direction. The moving end contact piece is arranged at one end of the moving end contact cup relative to the moving conductive rod. The moving end contact piece and the static end contact piece switch between contact and separation. When current flows through the static end contact cup, the vacuum arc and the moving end contact cup, a longitudinal magnetic field that diffuses the vacuum arc is generated in the gap between the static contact and the moving contact.

4. The topological structure of the zero-zone transverse magnetic enhanced high current circuit breaker according to claim 1, characterized in that: The transfer module comprises a transfer capacitor and a transfer inductor connected in series at one end of the transverse magnetic coil and a thyristor assembly arranged at the other end of the transverse magnetic coil. The thyristor assembly comprises a thyristor T1 and a thyristor T2 connected in reverse parallel.

5. The topological structure of the zero-zone transverse magnetic enhanced high current circuit breaker according to claim 1, characterized in that: The fast vacuum switch is driven via a fast operating mechanism, which includes an electromagnetic operating mechanism and a spring operating mechanism.

6. The topological structure of the zero-zone transverse magnetic enhanced high current circuit breaker according to claim 1, characterized in that: The current limiting resistor includes any one of a ceramic resistor, an aluminum shell resistor, and a cement resistor, or a combination of multiple thereof.

7. The topological structure of the zero-zone transverse magnetic enhanced high current circuit breaker according to claim 1, characterized in that: The auxiliary switch includes any one of a vacuum switch, an air switch, and a power electronic switch, or a combination of multiple thereof.

8. A method for breaking a topological structure of a zero-zone transverse magnetically enhanced high-current circuit breaker according to any one of claims 1 to 7, characterized in that: It includes the following steps, Step S100: When the fault current drops to a first characteristic value, a tripping instruction is sent to the fast vacuum switch; Step S200: When the fault current drops to the second characteristic value, the thyristor assembly is triggered, and the transfer module releases the transfer current to the fast vacuum switch, the current of the fast vacuum switch drops rapidly, the DC component decays, and an artificial zero crossing point is created. At the same time, the transfer current flows through the transverse magnetic coil, and a transverse magnetic field is synchronously applied to the contact gap of the fast vacuum switch to accelerate the dissipation of the residual plasma in the zero zone and enhance the recovery ability of the medium after the arc. Step S300: The fast vacuum switch is disconnected at zero crossing, the thyristor assembly is cut off at zero crossing, the fault current is limited by the current limiting module, and a tripping instruction is sent to the auxiliary switch to complete the fault current interruption.

9. A computer storage medium, characterized in that The storage medium includes computer instructions, which, when executed on a computer, cause the computer to perform the method as claimed in claim 8 .

10. An electronic device, characterized in that: The electronic device comprises: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the method according to claim 8 is implemented.

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