CN117747340A - Vacuum arc-extinguishing chamber with third electrode leading-out structure and direct current switching-on and switching-off method thereof - Google Patents
Vacuum arc-extinguishing chamber with third electrode leading-out structure and direct current switching-on and switching-off method thereof Download PDFInfo
- Publication number
- CN117747340A CN117747340A CN202311772917.9A CN202311772917A CN117747340A CN 117747340 A CN117747340 A CN 117747340A CN 202311772917 A CN202311772917 A CN 202311772917A CN 117747340 A CN117747340 A CN 117747340A
- Authority
- CN
- China
- Prior art keywords
- electrode
- extinguishing chamber
- vacuum arc
- magnetic field
- pulse capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000003990 capacitor Substances 0.000 claims abstract description 64
- 230000010355 oscillation Effects 0.000 claims abstract description 22
- 239000000919 ceramic Substances 0.000 claims abstract description 9
- 238000007599 discharging Methods 0.000 claims description 19
- 230000003068 static effect Effects 0.000 claims description 18
- 230000001960 triggered effect Effects 0.000 claims description 9
- 230000006698 induction Effects 0.000 claims description 7
- 229910052573 porcelain Inorganic materials 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 230000002441 reversible effect Effects 0.000 claims description 6
- 230000000670 limiting effect Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 230000002829 reductive effect Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Landscapes
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention discloses a vacuum arc-extinguishing chamber with a third electrode leading-out structure and a direct current switching-on and switching-off method thereof, wherein the vacuum arc-extinguishing chamber comprises a three-electrode vacuum arc-extinguishing chamber, an external magnetic field generating unit and an oscillating unit; a third electrode is arranged in the three-electrode vacuum arc-extinguishing chamber and comprises a third electrode contact piece and a third electrode leading-out terminal; the external magnetic field generating unit is sleeved on the ceramic shell of the three-electrode vacuum arc-extinguishing chamber, provides a strong magnetic field for an arc active area, forces the vacuum arc to be transferred to the third electrode, and triggers the oscillating unit connected with the third electrode; the oscillation unit comprises a pulse capacitor and an inductor, and can induce oscillation of a circuit to generate a natural current zero point; after the pulse capacitor is precharged, current can be injected into the fracture of the three-electrode vacuum arc-extinguishing chamber to form an artificial current zero point. Compared with the traditional mechanical direct current breaker, the method integrates the equivalent trigger element of the LC converting branch into the vacuum arc-extinguishing chamber, can omit a switching-on switch of the converting branch, simplifies control logic and reduces cost.
Description
Technical Field
The invention belongs to the technical field of vacuum arc-extinguishing chambers and direct current switching-on and switching-off, and particularly relates to a vacuum arc-extinguishing chamber with a third electrode leading-out structure and a direct current switching-on and switching-off method thereof.
Background
Because of the lack of natural current zero point, the direct current breaking technology has been one of the bottlenecks restricting the development of the direct current system. The basic principle of a mechanical direct current circuit breaker is to generate an artificial current zero point in an arc gap by adopting a reverse current injection mode. However, the injection of the reverse current requires precise control time, and the commutation branch closing switch must be triggered only when the main loop switch breaks beyond a certain distance, and the reverse current is injected. The gap of the fracture is insufficient when triggering in advance, and arc reignition or heavy strike is easy to cause. In addition, the commutation branch capacitor must be pre-charged, and the capacitor charging loop and the closing switch increase the complexity of the mechanical direct current breaker system and reduce the switching reliability.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a vacuum arc-extinguishing chamber with a third electrode leading-out structure and a direct current switching-on and switching-off method thereof, and the shielding cover of the traditional vacuum arc-extinguishing chamber is optimally designed so as to realize short-term through current and current switching-off; the transfer of the vacuum arc is realized by means of an externally applied magnetic field, an external oscillating unit is triggered on the basis, and a current zero point is introduced into the break of the oscillating unit and the vacuum arc-extinguishing chamber, so that the direct current break is realized.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the vacuum arc-extinguishing chamber with the third electrode leading-out structure comprises a three-electrode vacuum arc-extinguishing chamber 1, an external magnetic field generating unit 2 and an oscillating unit 3; the three-electrode vacuum arc-extinguishing chamber 1 is internally provided with a third electrode, and comprises a third electrode contact piece 8 and a third electrode leading-out terminal 12, wherein the third electrode contact piece 8 is arranged at the closing position of the moving contact and the static contact and is in a circular ring structure, and the third electrode leading-out terminal 12 is connected with the third electrode contact piece 8 and leads the third electrode contact piece to the outside of the vacuum arc-extinguishing chamber; the oscillation unit 3 is connected with a third electrode lead-out terminal 12 and is used for exciting loop oscillation and injecting current into the fracture; the external magnetic field generating unit 2 is arranged outside the three-electrode vacuum arc extinguishing chamber 1, excites a high-strength magnetic field and acts on an arc active area inside the three-electrode vacuum arc extinguishing chamber.
Further, the material of the third electrode contact piece 8 is the same as that of the static end electrode contact piece 9 and the moving end electrode contact piece 10 of the three-electrode vacuum arc-extinguishing chamber 1, and the sizes of the static end electrode contact 7 and the moving end electrode contact 11 of the three-electrode vacuum arc-extinguishing chamber 1 are the same or different.
Further, the ceramic shell of the three-electrode vacuum arc-extinguishing chamber 1 is divided into a static-end ceramic shell 5 and a movable-end ceramic shell 14, and the third electrode lead-out terminal 12 is embedded in the middle of the two sections of ceramic shells and extends to the outside of the vacuum arc-extinguishing chamber.
Further, the external magnetic field generating unit 2 is arranged on the static end porcelain shell of the three-electrode vacuum arc-extinguishing chamber 1.
Further, the external magnetic field generating unit 2 is a permanent magnet or an exciting coil; the external magnetic field generating unit 2 excites the high-intensity magnetic field with a magnetic induction intensity of more than 200mT.
Further, the permanent magnet adopts an annular halbach array.
Further, the oscillating unit 3 includes a pulse capacitor C X The device comprises a pulse capacitor charging loop, a pulse capacitor discharging loop, an inductor and a lightning arrester; the pulse capacitor C X Is connected in series with an inductor, and one end of the inductor is connected with three electricityA third electrode leading-out terminal 12 of the polar vacuum arc-extinguishing chamber 1, the other end and a pulse capacitor C X Connected, pulse capacitor C X The other end is grounded or connected with an external circuit; the lightning arresters are connected in parallel at two ends of the pulse capacitor; pulse capacitor charging loop is by adjustable direct current stabilized power supply, charging switch S that closes a floodgate 1 Current limiting resistor R x And pulse capacitor C X Sequentially connecting in series; pulse capacitor discharging loop is provided with a discharging switch S 2 Discharging switch S 2 The adjustable direct current stabilized power supply and the charging switch are connected in parallel, the adjustable direct current stabilized power supply and the charging switch are connected in series with the discharging resistor, and the current-limiting resistor R x Double as discharging resistor, discharging switch S 2 Discharge resistor and pulse capacitor C X And the pulse capacitor discharging loops are sequentially connected in series.
Further, the pulse capacitor C X The capacitance value of the inductor is in the order of muf and the inductance value of the inductor is in the order of muh.
The direct current switching-on/off method of the vacuum arc-extinguishing chamber with the third electrode leading-out structure has two switching-on/off modes, and when the fault current is less than 1kA, the current is directly switched on/off by a high-intensity magnetic field excited by the external magnetic field generating unit 2; when the fault current exceeds 1kA, the direct current vacuum arc is transferred to a third electrode of the three-electrode vacuum arc-extinguishing chamber 1 under the action of a high-intensity magnetic field excited by the external magnetic field generating unit 2, the oscillating unit 3 connected with the third electrode is triggered, a plurality of current zero points are formed in the oscillating unit 3 and a fracture of the vacuum arc-extinguishing chamber, and the direct current is cut off.
Further, after the direct current vacuum arc transfer and triggering of the oscillating unit 3, two current zero introduction modes exist; the first is: when the pulse capacitor of the oscillation unit is not precharged, the equivalent series capacitance of the system is reduced after the oscillation unit is triggered and connected into a circuit, so that the circuit is converted into an underdamped oscillation state, and a natural current zero point is introduced; the second is: when the pulse capacitor of the oscillation unit is precharged, after the oscillation unit is triggered and connected into a circuit, reverse current is injected into the vacuum gap by the pulse capacitor on the basis of circuit oscillation, and an artificial current zero point is introduced.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a vacuum arc-extinguishing chamber with a third electrode leading-out structure and a direct current breaking method thereof, wherein the three-electrode vacuum arc-extinguishing chamber is used as a breaking unit. Compared with the traditional mechanical direct current breaker, the method integrates the equivalent triggering element of the LC converting branch into the vacuum arc extinguishing chamber, realizes triggering by using the external strong magnetic field to transfer the arc, can omit the closing switch of the converting branch, simplifies the control logic and reduces the cost. Compared with a common vacuum arc-extinguishing chamber, the shielding cover of the three-electrode vacuum arc-extinguishing chamber is specially designed and is used as a third electrode contact, and the shielding cover comprises a third electrode contact sheet and a third electrode leading-out terminal. Other components are basically consistent with the traditional vacuum arc-extinguishing chamber, and the transformation difficulty is low.
The external magnetic field generating unit of the present invention includes a permanent magnet structure or an exciting coil. The permanent magnet can adopt a halbach array, so that the unidirectionality, uniformity and magnetic induction intensity of an applied magnetic field are improved to the greatest extent. The scheme of the exciting coil needs synchronous control, the reliability is reduced, but the magnetic field is flexibly adjusted, and the requirements under more working conditions can be met.
The oscillating unit of the invention mainly comprises a pulse capacitor and an inductor. The pulse capacitor may be pre-charged, triggering the injection of current into the fracture. In order to simplify the system and improve the reliability, the pulse capacitor can also operate without charging, and the oscillation unit passively receives loop current after triggering, can excite current oscillation and introduce zero crossing points.
Drawings
Fig. 1 is an assembly schematic diagram of a three-electrode vacuum interrupter, an external magnetic field generating unit, and an oscillating unit.
FIG. 2 is a schematic diagram of the pole orientation of an 8-order circular halbach array of an internal monopole magnetic field
Fig. 3 shows the calculation result of the magnetic induction intensity module value distribution on the central cross section of the ring halbach array.
Fig. 4 is a calculation result of magnetic induction intensity module value distribution on the central axial section of the annular halbach array.
Fig. 5 is a schematic plan view of the installation positions of the annular halbach array and the three-electrode vacuum interrupter.
Fig. 6 is a three-dimensional schematic diagram of the installation positions of the annular halbach array and the three-electrode vacuum interrupter.
Fig. 7 is a circuit diagram of an oscillation unit portion.
Fig. 8 is a typical open-close waveform of a small current vacuum arc under the action of a strong transverse magnetic field.
Fig. 9 is a schematic diagram of arc transfer with one end of the oscillating unit grounded.
Fig. 10 is a schematic arc transfer diagram of an oscillating unit with one end connected to a dc bus.
Fig. 11 shows a full-range current switching process of the dc switching method according to the present invention.
Detailed Description
The invention will now be described in further detail with reference to specific examples, which are intended to illustrate, but not to limit, the invention.
Examples
The embodiment of the invention provides a vacuum arc-extinguishing chamber with a third electrode leading-out structure and a direct current switching-on and switching-off method thereof, and the embodiment details one physical implementation of the method, including the size, materials, operation modes and the like of required equipment. The overall topology of the vacuum arc-extinguishing chamber with the third electrode leading-out structure is shown in fig. 1, and the vacuum arc-extinguishing chamber comprises a three-electrode vacuum arc-extinguishing chamber 1, an external magnetic field generating unit 2 and an oscillating unit 3. Wherein the external magnetic field generating unit 2 is not in direct contact with the three-electrode vacuum arc-extinguishing chamber 1, and the oscillating unit 3 is electrically connected with the three-electrode vacuum arc-extinguishing chamber 1.
Three-electrode vacuum arc-extinguishing chamber
As shown in fig. 1, the three-electrode vacuum arc-extinguishing chamber comprises a static end cover 4, a static end porcelain shell 5, a static end conductive rod 6, a static end electrode contact 7, a third electrode contact piece 8, a static end electrode contact piece 9, a moving end electrode contact piece 10, a moving end electrode contact 11, a third electrode lead-out terminal 12, a moving end conductive rod 13, a moving end porcelain shell 14, a corrugated pipe 15 and a moving end cover 16.
The fixed electrode contact 9 is fixed on the fixed electrode contact 7, the movable electrode contact 10 is fixed on the movable electrode contact 11, and the third electrode contact 8 is fixed on the third electrode lead-out terminal 12. The diameter of the static end electrode contact blade 9 is 20mm, the diameter of the movable end electrode contact blade 10 is 24mm, and the rated opening distance of the dynamic electrode contact is 8mm. The material of the dynamic and static electrode contact piece is CuCr25 (25% Cr). The third electrode contact 8 has an inner diameter of 28mm, a thickness of 2mm and a height of 10mm, and is made of CuCr25 (25% Cr). In the brake separating process, when the opening distance of the movable electrode contact reaches 4mm, the upper surface of the movable end electrode contact sheet 10 is flush with the lower surface of the third electrode contact sheet 8.
The heights of the two sections of porcelain shells of the three-electrode vacuum arc extinguishing chamber are consistent, a third electrode leading-out terminal 12 is led out from the middle of the two sections of porcelain shells, and the tail end of the third electrode leading-out terminal is provided with a wiring terminal which is connected with the oscillating unit 3 through a nut bolt. In order to prevent the inner space of the movable end side of the vacuum arc-extinguishing chamber from being insufficient, the sealing performance is affected by the extrusion of the corrugated tube 15 during opening, the closing position of the movable and static electrode contacts is arranged on the static end side of the vacuum arc-extinguishing chamber, and the external magnetic field generating unit is arranged at the same height to provide a strong magnetic field for the arc area.
External magnetic field generating unit
The direct current switching method has higher requirements on the externally applied magnetic field, and comprises good unidirectionality, uniformity and higher magnetic induction intensity. The external magnetic field generating unit 2 is a permanent magnet or an exciting coil. The permanent magnets are selected and distributed in an annular halbach array, and a high-strength unidirectional uniform magnetic field can be provided in the central area of the array. Fig. 2 is a typical 8-order ring halbach magnet array, in which the arrow indicates the magnetizing direction, and an N52-type neodymium-iron-boron magnet is used. An annular halbach array is arranged with an inner diameter of 74mm, an outer diameter of 140mm and a height of 40mm. Fig. 3 and 4 show the magnetic field distribution of the central cross section and the central axial cross section of the annular halbach array, respectively, and a unidirectional uniform magnetic field exceeding 400mT exists in the contact and arc areas. In the range of the axial height of 15-25mm in fig. 4, the magnetic induction intensity is not changed by more than 20mT, the magnetic field uniformity is more than 95%, and a stable strong transverse magnetic field can be provided for the whole arc movement process.
Fig. 5 and 6 are schematic views of the installation and matching of the annular halbach magnet array and the three-electrode vacuum arc-extinguishing chamber, and the annular halbach magnet array comprises an annular halbach magnet 17 and a protective shell 18. The annular halbach magnet array can be fixed by an external clamp, kept relatively static with the three-electrode vacuum arc-extinguishing chamber, or directly adhered and fixed on the static end porcelain shell 5 of the arc-extinguishing chamber, so as to provide a strong transverse magnetic field for an arc area.
Oscillating unit
As shown in fig. 7, the oscillating unit 3 is composed of a pulse capacitor C X The device comprises a capacitor charging loop, a capacitor discharging loop, an inductor and a lightning arrester. The pulse capacitor is connected in series with the inductor. One end of the inductor is connected with a third electrode leading-out terminal 12 of the three-electrode vacuum arc-extinguishing chamber, and the other end of the inductor is connected with a pulse capacitor C X And (5) connection. Pulse capacitor C X The other end is grounded or connected with a direct current bus. Pulse capacitor C X And the film capacitor is adopted, so that bipolar charge and discharge can be realized. The pulse capacitor charging loop comprises an adjustable direct current stabilized power supply and a charging switch S 1 Current limiting resistor R x . The pulse capacitor charging polarity includes a positive polarity and a negative polarity, and the charging polarity is a negative polarity as shown in fig. 7. Pulse capacitor discharging loop is provided with a discharging switch S 2 Current limiting resistor R x And also serves as a discharge resistor. The lightning arrester is connected in parallel with the pulse capacitor C X Both ends limit the overvoltage when the current is turned on and off.
DC switching method
The invention provides a direct current switching-on and switching-off method of a vacuum arc-extinguishing chamber with a third electrode leading-out structure, wherein the switching-on and switching-off range is 0-10kA. When the current is lower than 1kA, the direct current can be directly turned off under the action of the strong transverse magnetic field, as shown in fig. 8. Experimental results show that the contact opening distance is about 1-3mm, the rated opening distance is not yet reached, and the arc movement is not obvious. After the current is increased to 1kA, the arc cannot be extinguished at a short opening distance. As the opening distance increases, the motion effect of the arc starts to be remarkable. Under the action of strong transverse magnetic field, the electric arc moves along the direction of anti-ampere force, contacts and transfers to the third electrode contact piece 8 on the side face, and triggers the external oscillating unit 3 through the third electrode leading-out terminal 12.
In the direct current switching-on and switching-off method, the oscillating unit has two functions and effects. Firstly, the capacitance value of the pulse capacitor in the oscillating unit is in mu H level, which is far smaller than the equivalent capacitance of the DC system, the value of the inductance is in mu F level, and the capacitance value is also far smaller than the equivalent inductance of the DC system. When the arc is transferred to the third electrode, the oscillating unit is automatically connected in series to the circuit. The series connection of the pulse capacitors greatly reduces the equivalent capacitance value of the direct current system, so that the direct current system is converted from an over-damping mode to an under-damping oscillation mode, the direct current system is converted into an alternating current system, and a natural current zero point is introduced. The arc will be extinguished at the current zero point, the fracture bears the recovered voltage, and the breaking is completed. Second, the vacuum arc can realize self-current sharing and parallel combustion due to the positive volt-ampere characteristic of the vacuum arc. Thus, under the action of the transverse magnetic field, the vacuum may not be completely transferred to the third electrode and the arc will burn in parallel in the original gap and the new gap. The pulse capacitor is pre-charged and when the third electrode is connected to the circuit, the pulse capacitor discharges current to the new gap, which is superimposed with the original fault current. When the new gap current decreases, the original gap will shunt to it. Thus, all gap currents are reduced simultaneously and eventually an artificial current zero crossing is achieved. Pulsed capacitor pre-charging can also indirectly change the initial potential of the third electrode and affect the efficiency of the transfer of the vacuum arc to the third electrode.
The other end of the pulse capacitor is grounded or connected to a dc bus, which affects the polarity of the third electrode of the vacuum interrupter and the transfer and switching characteristics of the arc. Consider first a positive polarity dc bus. The third electrode is at a low potential when the pulse capacitor is grounded at one end, and a new arc path is formed between the anode and the third electrode in place of the original cathode contact during arc transfer, as shown in fig. 9. At this time, the cathode is a moving end contact, the anode is a static end contact, and the opening distance of the new arc channel is always unchanged, so that the transfer characteristic and the switching-on and switching-off characteristic of the arc are mutually restricted. The smaller the distance between the third electrode and the anode is set, the more advantageous the arc transfer and the more disadvantageous the arc extinction. And one end of the pulse capacitor is connected with the direct current bus, the third electrode is at a high potential, the original anode contact is replaced in the arc transfer process, and a new arc channel is formed between the cathode and the third electrode, as shown in fig. 10. With the movement of the cathode contact, the opening distance of a new arc channel is continuously increased, and the transfer characteristic and the breaking characteristic of the arc can be optimized in a time-sharing manner. The analysis principle of the negative polarity direct current bus is consistent and will not be described. However, considering that the connection of the pulse capacitor to the dc bus leads to long-term electrification of the oscillating unit, the insulation level is more demanding. The initial transfer characteristic and the switching-off characteristic after transfer of the vacuum arc can be satisfied by further improving the internal structural design of the three-electrode vacuum arc-extinguishing chamber.
In summary, the access of the pulse capacitor can change the circuit property, and a natural current zero point is introduced. The pre-charged pulse capacitor may also inject a reverse current into the third electrode, forming an artificial current zero. After the broken arc is extinguished, the overvoltage is limited by the lightning arrester connected with the two ends of the vacuum arc extinguishing chamber in parallel. Subsequently closing the discharge switch S 2 The pulse capacitor is discharged and is ready for the next switching-on and switching-off requirement. Full range current switching flow Cheng Ru is shown in fig. 11.
The invention provides a vacuum arc-extinguishing chamber with a third electrode leading-out structure and a direct current breaking method thereof, wherein the three-electrode vacuum arc-extinguishing chamber is used as a breaking unit. And a third electrode is arranged in the vacuum arc-extinguishing chamber and comprises a third electrode contact piece and a third electrode leading-out terminal. The vacuum arc is forced to be transferred to the third electrode by using an externally applied transverse magnetic field, and an externally connected oscillating unit is triggered. Compared with the traditional mechanical direct current breaker, the method integrates the equivalent trigger element of the LC converting branch into the vacuum arc-extinguishing chamber, can omit a switching-on switch of the converting branch, simplifies control logic and reduces cost.
Claims (10)
1. The utility model provides a vacuum interrupter with third electrode draws forth structure which characterized in that: comprises a three-electrode vacuum arc-extinguishing chamber (1), an external magnetic field generating unit (2) and an oscillating unit (3); the three-electrode vacuum arc-extinguishing chamber (1) is internally provided with a third electrode, the three-electrode vacuum arc-extinguishing chamber comprises a third electrode contact piece (8) and a third electrode leading-out terminal (12), the third electrode contact piece (8) is arranged at the closing position of the moving contact and the static contact and is in a circular ring structure, and the third electrode leading-out terminal (12) is connected with the third electrode contact piece (8) and leads the third electrode contact piece to the outside of the vacuum arc-extinguishing chamber; the oscillation unit (3) is connected with a third electrode leading-out terminal (12) and is used for exciting loop oscillation and simultaneously injecting current into the fracture; the external magnetic field generating unit (2) is arranged outside the three-electrode vacuum arc-extinguishing chamber (1) and used for exciting a high-intensity magnetic field to act on an arc active area inside the three-electrode vacuum arc-extinguishing chamber.
2. Vacuum interrupter with third electrode lead-out structure according to claim 1, characterized in that the material of the third electrode contact blade (8) is the same as the material of the stationary end electrode contact blade (9) and the moving end electrode contact blade (10) of the three electrode vacuum interrupter (1), and the dimensions of the stationary end electrode contact (7) and the moving end electrode contact (11) of the three electrode vacuum interrupter (1) are the same or different.
3. The vacuum interrupter with the third electrode lead-out structure according to claim 1, wherein the ceramic shell of the three-electrode vacuum interrupter (1) is divided into a static ceramic shell (5) and a moving ceramic shell (14), and the third electrode lead-out terminal (12) is embedded between the two ceramic shells and extends to the outside of the vacuum interrupter.
4. A vacuum interrupter with a third electrode lead-out structure according to claim 3, characterized in that the external magnetic field generating unit (2) is arranged on the stationary porcelain shell of the three-electrode vacuum interrupter (1).
5. Vacuum interrupter with third electrode lead-out structure according to claim 1, characterized in that the external magnetic field generating unit (2) is a permanent magnet or an exciting coil; the magnetic induction intensity of the external magnetic field generating unit (2) exciting the high-intensity magnetic field is more than 200mT.
6. The vacuum interrupter with third electrode lead-out structure of claim 1, wherein the permanent magnet is in the form of a ring halbach array.
7. The belt according to claim 1Vacuum interrupter of a third electrode lead-out structure, characterized in that the oscillating unit (3) comprises a pulse capacitor (C X ) The device comprises a pulse capacitor charging loop, a pulse capacitor discharging loop, an inductor and a lightning arrester; the pulse capacitor is connected with the inductor in series, one end of the inductor is connected with a third electrode leading-out terminal (12) of the three-electrode vacuum arc-extinguishing chamber (1), the other end of the inductor is connected with the pulse capacitor, and the other end of the pulse capacitor is grounded or connected with an external circuit; the lightning arresters are connected in parallel at two ends of the pulse capacitor; pulse capacitor charging loop is by adjustable direct current stabilized power supply, charging switch (S) 1 ) Current limiting resistor (R) x ) And pulse capacitors are sequentially connected in series to form the capacitor; pulse capacitor discharging loop set discharging switch (S) 2 ) Discharging switch (S) 2 ) Is connected in parallel with an adjustable DC stabilized power supply and a charging switch, is connected in series with a discharging resistor, and is provided with a current limiting resistor (R x ) Also used as a discharging resistor, a discharging switch (S) 2 ) Discharge resistor and pulse capacitor (C) X ) And the pulse capacitor discharging loops are sequentially connected in series.
8. Vacuum interrupter with third electrode lead-out structure according to claim 7, characterized in that the pulse capacitor (C X ) The capacitance value of the inductor is in the order of muf and the inductance value of the inductor is in the order of muh.
9. A direct current breaking method of a vacuum interrupter with a third electrode lead-out structure according to any one of claims 1 to 8, characterized in that the direct current breaking method has two breaking modes, when the fault current is less than 1kA, the current is directly broken by a high intensity magnetic field excited by an external magnetic field generating unit (2); when the fault current exceeds 1kA, the direct current vacuum arc is transferred to a third electrode of the three-electrode vacuum arc-extinguishing chamber (1) under the action of a high-intensity magnetic field excited by the external magnetic field generating unit (2), an oscillating unit (3) connected with the third electrode is triggered, a plurality of current zero points are formed in the oscillating unit (3) and a fracture of the vacuum arc-extinguishing chamber, and direct current break is realized.
10. The direct current breaking method according to claim 9, characterized in that after the direct current vacuum arc transfer, triggering of the oscillating unit (3), there are two current zero introduction modes; the first is: when the pulse capacitor of the oscillation unit is not precharged, the equivalent series capacitance of the system is reduced after the oscillation unit is triggered and connected into a circuit, so that the circuit is converted into an underdamped oscillation state, and a natural current zero point is introduced; the second is: when the pulse capacitor of the oscillation unit is precharged, after the oscillation unit is triggered and connected into a circuit, reverse current is injected into the vacuum gap by the pulse capacitor on the basis of circuit oscillation, and an artificial current zero point is introduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311772917.9A CN117747340A (en) | 2023-12-21 | 2023-12-21 | Vacuum arc-extinguishing chamber with third electrode leading-out structure and direct current switching-on and switching-off method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311772917.9A CN117747340A (en) | 2023-12-21 | 2023-12-21 | Vacuum arc-extinguishing chamber with third electrode leading-out structure and direct current switching-on and switching-off method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117747340A true CN117747340A (en) | 2024-03-22 |
Family
ID=90281009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311772917.9A Pending CN117747340A (en) | 2023-12-21 | 2023-12-21 | Vacuum arc-extinguishing chamber with third electrode leading-out structure and direct current switching-on and switching-off method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117747340A (en) |
-
2023
- 2023-12-21 CN CN202311772917.9A patent/CN117747340A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103441427B (en) | Multichannel gas spark switch applying plasma synthesis jet trigger technology | |
| CN206164495U (en) | Vacuum switch source of triggering of triggering in clearance is changed suddenly in area | |
| Alferov et al. | High-current vacuum switching devices for power energy storages | |
| CN202856146U (en) | Multichannel gas spark switch based on ultraviolet pre-ionization technology | |
| CN110430655A (en) | A kind of closed discharging gap of using plasma jet stream triggering and its application | |
| CN112582884B (en) | Gas switch structure based on low-working-coefficient low-jitter triggering | |
| CN102176401B (en) | High-power pseudo-spark switch tube for power electronic pulse conversion | |
| CN111348224A (en) | Micro-cathode arc propulsion system | |
| CN109647598A (en) | A kind of high-pressure pulse device for being crushed in solid water | |
| CN108598868A (en) | A kind of electrode structure and design method for gas spark switch | |
| CN117747340A (en) | Vacuum arc-extinguishing chamber with third electrode leading-out structure and direct current switching-on and switching-off method thereof | |
| CN209056763U (en) | Trigger switch trigger switch synchronous with the two-stage high power repetition that compact electromagnetic drives | |
| CN209597383U (en) | A kind of high-pressure pulse device for being crushed in solid water | |
| CN109449761B (en) | Trigger switch and small electromagnetic driven two-stage high-power repetition frequency synchronous trigger switch | |
| Shi et al. | Influence of opening velocity on arcing time windows of fast vacuum circuit breaker in duties of terminal fault test T100s | |
| CN210041324U (en) | Discharge tube follow current interruption device | |
| CN202094076U (en) | High-power pseudospark switching tube for power electronic impulse conversion | |
| Zhou et al. | Operational characteristics of a surface breakdown triggered vacuum switch with six gap rod electrode system | |
| CN107659291B (en) | High-voltage pulse generator with low jitter | |
| CN207052517U (en) | A kind of pneumatic series connection high-voltage switch | |
| CN201369310Y (en) | RF (radio frequency) external trigger gas discharge switch | |
| CN107316774B (en) | A kind of pneumatic series connection high-voltage switch | |
| CN101504903B (en) | RF external triggering gaseous discharging switch | |
| CN108183392B (en) | Pre-ionization triggered field distortion type high-pressure gas switch | |
| RU2207647C1 (en) | Switching device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |