CN113555857B - Quick fusing device based on arc voltage enhanced transfer - Google Patents
Quick fusing device based on arc voltage enhanced transfer Download PDFInfo
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- CN113555857B CN113555857B CN202110781899.5A CN202110781899A CN113555857B CN 113555857 B CN113555857 B CN 113555857B CN 202110781899 A CN202110781899 A CN 202110781899A CN 113555857 B CN113555857 B CN 113555857B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for DC systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/0241—Structural association of a fuse and another component or apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The utility model discloses a quick-acting fuse device based on arc voltage reinforcing shifts, in the quick-acting fuse device, quick-acting fuse device includes main current return circuit, fuse branch, horizontal magnetism current return circuit, wire outlet A1 and wire outlet A2, main current return circuit includes high-speed mechanical switch, high-speed mechanical switch one end is connected wire outlet A1, and the other end is connected wire outlet A2, and the fuse branch includes the fuse, the fuse connects in parallel high-speed mechanical switch, and wire outlet A1 is connected to fuse one end, and wire outlet A2 is connected to the other end, and when the electric current through the fuse reaches the fusing current, the fuse of fuse blows, and horizontal magnetism current return circuit is the independent return circuit, and it includes the freewheel diode of precharge capacitor, inductance and thyristor in series and parallelly connected precharge capacitor, and the magnetic blow coil of inductance is arranged in the high-speed mechanical switch fracture next door.
Description
Technical Field
The invention relates to the field of quick fusing, in particular to a quick fusing device based on arc voltage enhanced transfer.
Background
With the continuous advancement of urban construction, the development of high-power-supply-density, high-capacity and high-reliability direct current power distribution systems becomes an urgent requirement for the development of large and medium cities. In the direct current system, the traditional current limiter devices such as a reactor current limiter, a resistance current limiter, a superconducting current limiter and the like have large volume, high cost and difficult large-scale use. When the current limiting capability is limited, the circuit breaker needs long turn-off time for turning off the short-circuit current, and is difficult to adapt to the development requirements of high voltage and large current of a direct current system.
In the field of alternating current systems, although a fusing current limiting device is arranged, the short-circuit current of the alternating current system has a natural zero crossing point, and the current can be automatically transferred to a fuse. The short-circuit fault of the direct current system has the characteristics of high current rising speed, high short-circuit current peak value, no natural zero crossing point and the like, so that the arc voltage is increased in a transverse magnetic arc regulation mode, a fuse is conducted, the short-circuit current energy is dissipated through the fuse fusing of the fuse, the short-circuit current is directly opened or the short-circuit current level is greatly reduced, and the opening requirement of a circuit breaker is reduced.
The invention aims to provide a rapid fusing device based on arc voltage enhanced transfer, which can rapidly respond to the short-circuit condition of a direct current system, can finish the breaking or current limiting of a large short-circuit current and improve the system stability.
The above information disclosed in the background section is only for enhancement of understanding of the background of the invention and therefore may contain information that does not form the prior art that is already known in the country to a person of ordinary skill in the art.
Disclosure of Invention
Aiming at the defects or drawbacks of the prior art, the invention aims to provide a rapid fusing device based on arc voltage enhancement transfer, which is characterized in that a magnetic field is generated through a transverse magnetic current loop, the arc shape is regulated, the resistance of the arc is increased and is oscillated, the arc voltage is rapidly increased, a fuse is conducted, and the short-circuit current energy is dissipated in a fusing period. The function of quick switching-on and switching-off or current limiting of short-circuit current under the short-circuit fault working condition of the medium-voltage direct-current system is realized.
The aim of the invention is achieved by the following technical scheme.
The rapid fusing device based on arc voltage enhanced transfer comprises a main current loop, a fuse branch, a transverse magnetic current loop, an outlet end A1 and an outlet end A2, wherein,
The main current loop comprises a high-speed mechanical switch, one end of the high-speed mechanical switch is connected with the outlet wire end A1, the other end is connected with the outlet wire end A2,
The fuse branch comprises a fuse which is connected with the high-speed mechanical switch in parallel, one end of the fuse is connected with the wire outlet end A1, the other end of the fuse is connected with the wire outlet end A2, when the current passing through the fuse reaches the fusing current, the fuse of the fuse is fused,
The transverse magnetic current loop is an independent loop and comprises a pre-charge capacitor, an inductor, a thyristor and a freewheeling diode connected with the pre-charge capacitor in parallel, wherein a magnetic blowing coil of the inductor is arranged beside a fracture of the high-speed mechanical switch.
In the rapid fusing device based on arc voltage enhanced transfer, under the normal through-flow state of the system, the system current flows from the main current loop, the directions are wire outlets A1 to A2, the system current flows through the high-speed mechanical switch, the on-state loss of the system is the loss of the current in the main current loop, and no current flows through a fuse branch;
When a short circuit fault occurs in the system, the high-speed mechanical switch is disconnected, the thyristor is triggered to be conducted simultaneously, the capacitor pre-charge voltage discharges the inductor, the magnetic blowing coil of the inductor generates a magnetic field to influence an electric arc in a vacuum fracture of the high-speed mechanical switch, the electric arc resistance rises, the electric arc voltage rises, the fuse is conducted, the large current is forced to be transferred to a fuse branch, the fuse of the fuse is fused, the energy of the short circuit current is dissipated, and the opening or the current limiting of the large-current short circuit fault is realized.
In the rapid fusing device based on arc voltage enhanced transfer, the magnetic field is a transverse magnetic field.
In the rapid fusing device based on arc voltage enhanced transfer, the magnetic field is a transverse magnetic field in a single direction, a superimposed transverse magnetic field in a plurality of directions or a rotary transverse magnetic field.
In the rapid fusing device based on arc voltage enhanced transfer, a magnetic blowing coil generates a transverse arc blowing magnetic field for a fracture of the high-speed mechanical switch under the discharging current of the pre-charging capacitor.
In the rapid fusing device based on arc voltage enhanced transfer, the fuse adopts one or more parallel connection modes.
In the rapid fusing device based on arc voltage enhanced transfer, an arc extinguishing medium adopted by an arc extinguishing chamber of the high-speed mechanical switch is air, SF6, N2, H2 or vacuum, and a fracture contact structure is a flat contact.
In the rapid fusing device based on arc voltage enhanced transfer, the high-speed mechanical switch is a high-speed mechanical switch based on electromagnetic repulsion, a mechanical switch based on high-speed motor drive or a high-speed mechanical switch based on explosion drive.
The rapid fusing device based on arc voltage enhancement transfer disclosed by the invention has the advantages that a novel loop topology is designed, a transverse magnetic arc blowing coil is additionally arranged at a vacuum fracture of a high-speed mechanical switch, the arc voltage is improved, and the fuse is conducted to realize the function of breaking or limiting current. The novel quick fusing device has the characteristics of simple structure, small on-state loss, high current transfer speed and low cost.
The foregoing description is only an overview of the technical solutions of the present invention, to the extent that it can be implemented according to the content of the specification by those skilled in the art, and to make the above-mentioned and other objects, features and advantages of the present invention more obvious, the following description is given by way of example of the present invention.
Drawings
Various other advantages and benefits of the present invention will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. It is evident that the figures described below are only some embodiments of the invention, from which other figures can be obtained without inventive effort for a person skilled in the art. Also, like reference numerals are used to designate like parts throughout the figures.
In the drawings:
FIG. 1 is a schematic view of a main body of the fast fusing device;
FIGS. 2 (a) to 2 (d) are schematic diagrams illustrating the operation of the present invention when a short circuit occurs in the system;
FIG. 3 is a schematic waveform diagram of current during operation of the instant invention fuse device;
FIG. 4 is a schematic illustration of the mating of a fuse with a vacuum break or SF6 break in accordance with an embodiment of the present invention;
FIG. 5 is a schematic diagram of an application example of the present invention, in which two fuses are connected in parallel to cope with multiple current limiting conditions;
fig. 6 is a schematic diagram of an application example of the present invention, where two fuses are connected in parallel to cope with multiple current limiting conditions, while limiting overvoltage with zinc oxide arresters.
The invention is further explained below with reference to the drawings and examples.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to fig. 1 to 6 of the accompanying drawings. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will understand that a person may refer to the same component by different names. The description and claims do not identify differences in terms of components, but rather differences in terms of the functionality of the components. As used throughout the specification and claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description hereinafter sets forth a preferred embodiment for practicing the invention, but is not intended to limit the scope of the invention, as the description proceeds with reference to the general principles of the description. The scope of the invention is defined by the appended claims.
For the purpose of facilitating an understanding of the embodiments of the invention, reference will now be made to the drawings of several embodiments illustrated in the drawings, and the accompanying drawings are not to be taken as limiting the embodiments of the invention.
Fig. 1 is a schematic structural diagram of a rapid-melting device based on arc voltage enhancement transfer according to an embodiment of the present invention, and an embodiment of the present invention will be specifically described with reference to fig. 1.
The quick fusing device comprises a main current loop, a fuse branch, a transverse magnetic current loop, an outlet end A1 and an outlet end A2, wherein,
The main current loop comprises a high-speed mechanical switch, one end of the high-speed mechanical switch is connected with the outlet wire end A1, the other end is connected with the outlet wire end A2,
The fuse branch comprises a fuse which is connected with the high-speed mechanical switch in parallel, one end of the fuse is connected with the wire outlet end A1, the other end of the fuse is connected with the wire outlet end A2, when the current passing through the fuse reaches the fusing current, the fuse of the fuse is fused,
The transverse magnetic current loop is an independent loop and comprises a pre-charge capacitor, an inductor, a thyristor and a freewheeling diode connected with the pre-charge capacitor in parallel, wherein a magnetic blowing coil of the inductor is arranged beside a fracture of the high-speed mechanical switch.
In the preferred embodiment of the rapid fusing device based on arc voltage enhanced transfer, under the normal through-flow state of the system, the system current flows from the main current loop, the directions are the wire outlet ends A1 to A2, the system current flows through the high-speed mechanical switch, the on-state loss of the system is the loss of the current in the main current loop, and no current flows through the fuse branch;
When a short circuit fault occurs in the system, the high-speed mechanical switch is disconnected, the thyristor is triggered to be conducted simultaneously, the capacitor pre-charge voltage discharges the inductor, the magnetic blowing coil of the inductor generates a magnetic field to influence an electric arc in a vacuum fracture of the high-speed mechanical switch, the electric arc resistance rises, the electric arc voltage rises, the fuse is conducted, the large current is forced to be transferred to a fuse branch, the fuse of the fuse is fused, the energy of the short circuit current is dissipated, and the opening or the current limiting of the large-current short circuit fault is realized.
In the preferred embodiment of the rapid-fusing device based on arc voltage enhanced transfer, the magnetic field is a transverse magnetic field.
In the preferred embodiment of the rapid-acting fusing device based on arc voltage enhanced transfer, the magnetic field is a transverse magnetic field in a single direction, a superimposed transverse magnetic field in multiple directions or a rotary transverse magnetic field.
In the preferred embodiment of the rapid-melting device based on arc voltage enhanced transfer, the magnetic blowing coil generates a transverse arc blowing magnetic field for the fracture of the high-speed mechanical switch under the discharge current of the pre-charge capacitor.
In the preferred embodiment of the rapid-acting fusing device based on arc voltage enhanced transfer, the fuses adopt one or more parallel connection modes.
In the preferred embodiment of the rapid fusing device based on arc voltage enhanced transfer, an arc extinguishing medium adopted by an arc extinguishing chamber of the high-speed mechanical switch is air, SF6, N2, H2 or vacuum, and a fracture contact structure is a flat contact.
In the preferred embodiment of the rapid fusing device based on arc voltage enhanced transfer, the high-speed mechanical switch is a high-speed mechanical switch based on electromagnetic repulsion, a mechanical switch based on high-speed motor drive or a high-speed mechanical switch based on explosion drive.
In the normal through-flow state of the system, the system current flows from the main current loop in the directions from A1 to A2, the system current flows through the high-speed mechanical switch, and the on-state loss of the system is the loss of the current in the high-speed mechanical switch. At this point the fuse is not conducting and no current flows through the branch. When the system has short-circuit fault and the short-circuit current level of the system is high, the high-speed mechanical switch is controlled to be opened, and meanwhile, the thyristor in the transverse magnetic current loop is triggered to be conducted. Because of the pre-charge voltage of the capacitor, the inductor is discharged, the inductor generates a magnetic field, the electric arc in the vacuum fracture of the high-speed mechanical switch is influenced, the electric arc shape is changed, the electric arc resistance is increased, the electric arc voltage is increased, the fuse is conducted, the large current is forced to be transferred to the branch of the fuse, the fuse is fused, the energy of the short-circuit current is dissipated, and the break or the current limitation of the large-current short-circuit fault is realized. The high-speed mechanical switch is a high-speed mechanical switch based on electromagnetic repulsion force, a mechanical switch based on high-speed motor drive or a high-speed mechanical switch based on explosion drive. The arc extinguishing medium adopted by the arc extinguishing chamber can be air, SF6, N2, H2, vacuum and the like, and the fracture contact structure is a flat contact, so that the flat contact has small contact mass and strong rated current capacity. The arc voltage is rapidly increased when the fracture is opened by an externally applied transverse magnetic field.
In one embodiment, the transverse magnetic current loop is a capacitor, the coil and the thyristor are connected in series, and two ends of the capacitor are connected in anti-parallel with a freewheeling diode. Wherein the capacitor is pre-charged with the voltage. The rated current of the fuse is not required, and the fusing current is smaller than the current when the system is in short circuit fault. The fuses may be connected in one or more parallel.
Fig. 2 (a) to 2 (d) show the operation of the quick-acting fuse device in the event of a short circuit in the system. This operation will be described below with reference to fig. 2 (a) to 2 (d).
(1) In the normal through-flow state shown in fig. 2 (a), the system current flows in from the outlet terminal A1, passes through the high-speed mechanical switch, and flows out from the outlet terminal A2;
(2) As shown in fig. 2 (b), when the switch needs to be turned off, the high-speed mechanical switch is triggered to be opened, the thyristor of the transverse magnetic current loop is triggered to be conducted, the contacts are burnt, and the coil generates a magnetic field to blow an arc;
(3) As shown in fig. 2 (c), the arc voltage increases, the fuse is turned on, and the short-circuit current starts to be transferred to the fuse;
(4) As shown in fig. 2 (d), the working condition of the high-speed mechanical switch when the short-circuit current is turned off is shown, the vacuum break of the high-speed mechanical switch is arc-extinguished, the short-circuit current is completely transferred to the fuse, and after a short time, the fuse is fused, the energy of the system is dissipated, and the switching-off is completed;
FIG. 3 shows schematic waveform diagrams of current of each part of the rapid-acting fuse device based on arc voltage enhancement when the rapid-acting fuse device works under a short-circuit working condition. Wherein, a short circuit fault occurs at the time t1, and the current flowing through the fracture rises rapidly; triggering the transverse magnetic current loop to be conducted at the moment t2, and increasing the current of the arc blowing coil; the fracture of the high-speed mechanical switch is pulled open at the moment t3, and the current starts to be transferred to the fuse under the action of the enhanced arc voltage; all the current is transferred to the fuse at the moment t4, and the fuse starts to fuse to generate fusing overvoltage; the fusing is completely finished at the time t5, and the short-circuit current is limited.
Figure 4 shows an implementation of the fast fusing device in which the fuse cooperates with a vacuum break to limit the current.
Fig. 5 shows an implementation application of the fast fusing device, namely, two fuses are connected in parallel, the two fuses are switched through a single-pole double-throw switch, after one current limiting is completed, the two fuses can be switched to the other fuse, and the system can quickly restore power supply.
FIG. 6 shows an implementation of the fast-acting fuse device, in which two fuses are connected in parallel, and the two fuses are switched by a single-pole double-throw switch, so that after one current limiting, the two fuses can be switched to the other fuse, and the system can quickly restore power supply; meanwhile, zinc oxide arresters are connected in parallel at two ends of the high-speed switch to inhibit overvoltage in the fusing process and absorb energy.
Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described specific embodiments and application fields, and the above-described specific embodiments are merely illustrative, and not restrictive. Those skilled in the art, having the benefit of this disclosure, may effect numerous forms of the invention without departing from the scope of the invention as claimed.
Claims (2)
1. Quick fusing device based on arc voltage reinforcing shifts, its characterized in that: the quick fusing device comprises a main current loop, a fuse branch, a transverse magnetic current loop, an outlet end A1 and an outlet end A2, wherein,
The main current loop comprises a high-speed mechanical switch, one end of the high-speed mechanical switch is connected with the wire outlet end A1, the other end is connected with the wire outlet end A2,
The fuse branch comprises two fuses which are connected in parallel, the fuse branch is switched to the other fuse after one current limiting is completed through a single-pole double-throw switch, the fuses are connected in parallel with the high-speed mechanical switch, one end of each fuse is connected with an outlet terminal A1, the other end of each fuse is connected with an outlet terminal A2, when the current passing through the fuses reaches the fusing current, the fuses of the fuses are fused, zinc oxide lightning arresters are connected in parallel at the two ends of the high-speed mechanical switch, an arc extinguishing medium adopted by an arc extinguishing chamber of the high-speed mechanical switch is vacuum, a fracture contact structure is a flat contact,
The transverse magnetic current loop is an independent loop and comprises a pre-charge capacitor, an inductor, a thyristor and a freewheeling diode connected with the pre-charge capacitor in parallel, wherein a magnetic blowing coil of the inductor is arranged beside a fracture of the high-speed mechanical switch,
Under the normal through-flow state of the system, the system current flows through the main current loop, the directions are the wire outlet ends A1 to A2, the system current flows through the high-speed mechanical switch, the on-state loss of the system is the loss of the current in the main current loop, and no current flows through the fuse branch;
When a short-circuit fault occurs in the system, the high-speed mechanical switch is switched off, the thyristor is triggered to be conducted simultaneously, the pre-charge voltage of the capacitor discharges the inductor, the magnetic blowing coil of the inductor generates a magnetic field to influence the electric arc in the vacuum fracture of the high-speed mechanical switch, the shape of the electric arc is regulated and controlled, the electric arc resistance rises, the electric arc voltage rises, the fuse is conducted, the large current is forced to be transferred to a fuse branch, the fuse of the fuse is fused, the energy of the short-circuit current is dissipated, the on-off or current limiting of the large-current short-circuit fault is realized, the zinc oxide lightning arresters connected at the two ends of the high-speed mechanical switch in parallel inhibit the overvoltage in the fusing process and absorb the energy,
The high-speed mechanical switch is a high-speed mechanical switch based on electromagnetic repulsion, a mechanical switch based on high-speed motor drive or a high-speed mechanical switch based on explosion drive;
the magnetic field is a transverse magnetic field in a single direction, a superimposed transverse magnetic field in a plurality of directions or a rotary transverse magnetic field;
the magnetic blow-out coil generates a transverse blow-out magnetic field for the fracture of the high-speed mechanical switch under the discharge current of the pre-charge capacitor;
the two ends of the precharge capacitor are reversely connected with the freewheeling diode in parallel,
The rated current of the fuse is not required, the fusing current is smaller than the current when the system is in short circuit fault,
The flat contact has small contact mass and strong rated current capacity, realizes the rapid promotion of arc voltage when breaking and opening by an externally applied transverse magnetic field,
Under the normal through-flow state, the system current flows in from the outlet end A1, and flows out from the outlet end A2 after passing through the high-speed mechanical switch; when the switch needs to be turned off, a high-speed mechanical switch is triggered to break off, a thyristor of a transverse magnetic current loop is triggered to conduct, the contacts are burnt, and a coil generates a magnetic field to blow an arc; the arc voltage rises to conduct the fuse, and the short-circuit current starts to transfer to the fuse; when the short-circuit current is turned off, the vacuum fracture of the high-speed mechanical switch is subjected to arc extinction, the short-circuit current is completely transferred to the fuse, and after a short time, the fuse is fused, so that the system energy is dissipated, and the switching-on and switching-off are completed;
When the short-circuit working condition works, the time from the time t1, the time t2, the time t3, the time t4 to the time t5 is sequentially as follows: short-circuit fault occurs at time t1, and current flowing through the fracture rises rapidly; triggering the transverse magnetic current loop to be conducted at the moment t2, and increasing the current of the arc blowing coil; the fracture of the high-speed mechanical switch is pulled open at the moment t3, and the current starts to be transferred to the fuse under the action of the enhanced arc voltage; all the current is transferred to the fuse at the moment t4, and the fuse starts to fuse to generate fusing overvoltage; the fusing is completely finished at the time t5, and the short-circuit current is limited;
at time t3, the fracture current and the transverse magnetic loop current reach the maximum value at the same time.
2. The arc voltage enhanced transfer-based flash fuse device of claim 1, wherein: the fuse adopts one or more parallel connection modes.
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| CN106206208A (en) * | 2016-07-26 | 2016-12-07 | 中国科学院等离子体物理研究所 | The hybrid dc circuit breaker that great power bidirectional cut-offs |
| CN108270198A (en) * | 2018-01-08 | 2018-07-10 | 西安交通大学 | A kind of direct current composite switch apparatus and method of work |
| CN109066606A (en) * | 2018-07-12 | 2018-12-21 | 武汉杭久电气有限公司 | A kind of two-way forced commutation type direct current current-limiting circuit breaker |
| CN109935479A (en) * | 2019-04-23 | 2019-06-25 | 西安交通大学 | DC circuit breaker based on vacuum magnetic blowing transfer and its breaking method |
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