CN110224379B - High-voltage direct-current circuit breaker based on vacuum and series connection of SF6 arc extinguish chambers - Google Patents
High-voltage direct-current circuit breaker based on vacuum and series connection of SF6 arc extinguish chambers Download PDFInfo
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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
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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
- H01H33/666—Operating arrangements
- H01H33/6661—Combination with other type of switch, e.g. for load break switches
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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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Abstract
The invention relates to a high-voltage direct-current circuit breaker based on vacuum and series connection of an SF6 arc extinguish chamber, wherein a vacuum circuit breaker VIU and an SF6 circuit breaker GIU are connected in series to form a main switch, an oscillating circuit comprises a positive oscillating circuit and a negative oscillating circuit, if the fault current is positive fault current, the main switch is rapidly switched off and then is triggered to conduct the positive oscillating circuit, intermediate-frequency oscillating current is introduced to be superposed on the main switch to create a current zero point for the main switch, a positive series thyristor assembly SCR2 is triggered to be conducted, a reverse TRV is conducted through a high-voltage follow current branch circuit, when the current of the high-voltage follow current branch circuit crosses zero, the SCR2 of the series thyristor assembly is turned off in a zero crossing way, the positive TRV time reaches the two ends of the main switch and the high-voltage follow current branch circuit, the divider resistor realizes the synergistic effect of the dynamic voltage distribution of the vacuum and SF6 fracture and the recovery strength of the dynamic medium, the lightning arrester starts to work after the TRV voltage reaches the set voltage of the lightning arrester, and the current starts to be transferred to the lightning arrester branch circuit by the oscillating circuit; and is disconnected by the disconnecting switch DS, so that the direct current fault current is disconnected.
Description
Technical Field
The invention belongs to the field of high-voltage direct-current circuit breakers, and relates to a novel hybrid high-voltage direct-current circuit breaker based on key technologies of vacuum and SF6 circuit breaker series connection as a main switch, creation of 'zero voltage break' and dynamic medium recovery cooperative control and the like by integrating a high-voltage follow current branch.
Background
The multi-terminal direct-current transmission system, the direct-current transmission and distribution network and the like are the development trend and direction of a future power grid, the high-voltage direct-current power grid has advantages in aspects of large-capacity long-distance transmission, new energy grid connection and consumption, large power grids for interconnection and the like, and meanwhile, engineering application of the high-voltage direct-current power grid faces a series of key technical problems, one of which is the development of a high-voltage direct-current breaker.
The breaking modes of the current high-voltage direct-current circuit breaker are mainly classified into 3 types: self-excited oscillation, forced zero crossing and mixed DC on-off of parallel connection of power electronic device and mechanical switch. The forced zero-crossing and hybrid direct-current circuit breaker is a main hot spot of domestic and foreign research. In the aspect of a hybrid direct current breaker, an HVDC breaker based on a high-speed isolating switch and IGBTs which are connected in parallel is developed by ABB in 2012, the rated voltage of the HVDC breaker is 80kV, the rated current of the HVDC breaker is 2kA, the cut-off current of the HVDC breaker is 9kA, the cut-off time of the HVDC breaker is 5ms, and meanwhile, a 320kV hybrid high-voltage direct current breaker scheme is provided based on module series connection. In 2014, Alstom developed a 120kV/5ms/7.5kA hybrid high-voltage direct-current circuit breaker prototype. In 2015, a 200kV/3ms/12kA hybrid high-voltage direct-current circuit breaker model was developed by national grid intelligent grid research institute. In the field of forced zero-crossing switching, Toshiba Japan company proposed a forced zero-crossing high-voltage direct-current circuit breaker based on vacuum and SF6 arc extinguish chamber series connection as a main switching unit in 1984, and developed 250kV and 1200A experimental prototypes. In recent years, mitsubishi corporation developed a mechanical forced zero-cross dc circuit breaker with a rated voltage of 80kV and an open current of 16kA (open time of 10 ms). ABB studied 80kV, 10.5kA DC circuit breakers (switching time 5 ms). Direct current circuit breaker units of 55kV, 16kA and 5ms were developed in 2014 by western electric company, western-security traffic university and the like, and are connected in series to form a direct current circuit breaker model of 110kV, 12kA and 4.6 ms. The middle of the university of great managerial works, the middle of the Yan rock team, proposed a mechanically interlocked 15kV, 10kA direct current breaker module.
In the aspect of forced zero-crossing direct current breaking, the vacuum switch has the characteristics of high dynamic medium recovery speed and suitability for medium-high frequency breaking, but the dynamic insulation strength of the vacuum switch has a saturation effect, the voltage grade of a commercially mature single-break vacuum circuit breaker can only reach 72.5kV, a multi-break series technology is required to be adopted in the application of a high-voltage field (110kV), a plurality of vacuum arc-extinguishing chambers are connected in series, the control is complex, and the reliability is reduced. The traditional mechanical forced zero-crossing direct current breaker module has lower voltage grade, more ultra-high voltage direct current application series modules, and the hybrid direct current breaker with the mechanical switch connected with the power electronics in parallel has more series-parallel connection numbers of power electronics, high cost and complex control.
Disclosure of Invention
Aiming at the defects, the invention provides that a vacuum and SF6 circuit breaker is adopted as a main on-off switch to realize higher voltage level, the advantages of high vacuum medium recovery speed and high SF6 medium recovery strength are fully utilized, and the synergistic gain effect of the dynamic voltage distribution and the dynamic medium recovery strength of the vacuum and SF6 circuit breakers is exerted. And meanwhile, a high-voltage follow current branch is introduced to create a 'voltage zero-break' for the main switch so as to obtain longer dynamic medium recovery time. The whole main switch is formed by connecting a vacuum circuit breaker and an SF6 circuit breaker in series, and a series of high-voltage direct-current circuit breaker modules of 50kV, 150kV, 200kV and the like are formed by connecting a 10kV and 35kV vacuum circuit breaker and a 35kV, 110kV and 220kV SF6 circuit breaker in series as main switches respectively. Because the medium recovery strength of the SF6 circuit breaker can be higher, the DC circuit breaker module with higher voltage level can be realized by adopting the vacuum circuit breaker and the SF6 circuit breaker which are connected in series compared with a multi-break vacuum circuit breaker technology.
The technical scheme adopted by the invention is as follows: a novel high-voltage direct-current circuit breaker based on series connection of a vacuum arc extinguish chamber and an SF6 arc extinguish chamber comprises a main switch, a divider resistor, an isolating switch, a high-voltage follow current branch circuit, an oscillating current branch circuit, a lightning arrester, a current detection and intelligent controller, wherein the vacuum circuit is connected with the SF6 circuit breaker in series to form the main switch, an LC oscillating circuit is used for providing reverse current to be superposed with the main current to create an artificial zero crossing point, the reverse voltage after the zero crossing is conducted by the high-voltage follow current branch circuit so as to create longer medium recovery time after the zero crossing of the main switch, and after the reverse current, forward transient recovery voltage is applied to two ends of a hybrid direct-current circuit breaker.
The main switch is composed of a vacuum circuit breaker VIU and an SF6 circuit breaker GIU which are connected in series, a voltage dividing resistor is connected in parallel at two ends of the vacuum circuit breaker and an SF6 circuit breaker, wherein two ends of the vacuum circuit breaker are connected in parallel with a nonlinear resistor RNAnd the two ends of the SF6 breaker are connected with a divider resistor R in parallelDIn the process of opening and closing, when the voltage at two ends of the vacuum circuit breaker is far less than the nonlinear resistor RNAt operating voltage of (3), RNFar greater than RDAfter the nonlinear resistor acts in an overvoltage mode, the nonlinear resistor RNConstant voltage is borne, the whole main switch voltage is mainly borne by an SF6 circuit breaker, initial Transient Recovery Voltage (TRV) is mainly borne by a vacuum circuit breaker and later TRV is mainly borne by an SF6 circuit breaker through the cooperative action of a divider resistor and vacuum in the main switch and the SF6 circuit breaker, and the advantages of high dynamic medium recovery speed of the vacuum circuit breaker and high dynamic medium recovery strength of the SF6 circuit breaker are fully exertedAnd the series fracture cooperative gain effect is realized.
The isolating switch DS is a high-voltage direct-current isolating switch and is mainly used for cutting off leakage current after direct current is cut off to realize electrical isolation.
When the current is positive (namely from left to right), L2, C2 and TVS2 form a positive oscillating circuit, L1, C1 and TVS1 form a negative oscillating circuit, R2 and CB2 charge and control a capacitor C2, and R1 and CB1 charge and control a capacitor C1. In normal operation, the voltage at A, B and C positions in FIG. 1 is the rated voltage of the DC system, the charge control switches CB1 and CB2 are switched on, and the voltage of the capacitors C1 and C2 is full-charged to the rated voltage of the DC system. When the main current is in the forward direction (from left to right), after a fault occurs, the short-circuit current is rapidly increased, after the main switch is switched off, the TVS2 is triggered to be conducted, the C2 and the L2 oscillate to generate intermediate-frequency current which is superposed in the main switch current, so that a current zero-crossing point is created for the main switch, and the main switch can complete arc extinction. When the main current direction is negative, and a short-circuit fault occurs, the TVS1 is triggered to be conducted, and a current zero-crossing point is created.
The high-voltage follow current branch circuit consists of a current-limiting resistor R, a current-limiting inductor L, a series thyristor assembly SCR1 and an SCR2, wherein the series thyristor assembly has a voltage-sharing resistor RGStatic and dynamic voltage sharing is realized, and the current limiting resistor R and the current inductor L are used for limiting the current of the high-voltage follow current branch, so that the current of the series thyristor assembly is reduced, and the cost of the thyristor assembly is reduced. After the current of the main switch crosses zero, if there is no high-voltage follow current branch, in the course of forward current cut-off, two ends of the main switch produce reverse TRV, said reverse TRV is not favourable for dynamic medium recovery of main switch, the invention introduces high-voltage follow current branch, in the initial stage of reverse TRV, the correspondent thyristor component is controlled to be switched on, the reverse TRV is switched on by means of thyristor component, so that it can implement follow current process with almost no reverse TRV, said stage is "voltage zero rest", when the forward TRV is applied to main switch and series thyristor component, the voltage borne by series thyristor component is far higher than highest TRV in the cut-off process, and then the main switch can obtain longer dynamic medium recovery time after "voltage zero rest" time, then can bear forward TRV to implement forward TRVHigher dynamic medium recovery strength is achieved.
The lightning arrester adopts a zinc oxide lightning arrester and is mainly used for absorbing energy stored in a smoothing reactor of a direct current system and the like. After the high-voltage follow current is finished, the positive TRV is rapidly increased, and after the action of the lightning arrester is reached, the lightning arrester acts to discharge the energy stored by the system.
The current sensors CT1 and CT2 realize the detection of main current and main switch current, and are used for realizing the quick identification of short circuit fault and short circuit, the judgment of fault current direction and the coordination control of each switch by the intelligent controller.
The working process of the invention is as follows:
the intelligent controller rapidly identifies the main current, when the main current direction is positive, the simplified electrical structure diagram is shown in fig. 2, the working principle is shown in fig. 3, and (1) the normal working stage (0-t)F): the main current is 2kA rated current, and the rated current is borne by a disconnecting switch DS, a vacuum circuit breaker VIU and an SF6 circuit breaker GIU which are connected in series. Meanwhile, an energy storage capacitor C2 of the oscillating circuit is charged from the rated voltage of the point B through branches L2, C2, CB2 and R2 to reach the rated voltage of the system; (2) fault current rise phase (t)F～tC): at 20ms (t)F) When a short-circuit fault occurs, the current starts to increase rapidly from 2kA due to the current limiting function of the smoothing reactor, and the vacuum circuit breaker and the SF6After the circuit breaker breaks down, the circuit breaker is quickly opened, and the charging control switch CB1 is opened; (3) main switch current reduction to zero phase (t)C～tD0): at 25ms (t)C) When the current is switched on, the TVS2 is triggered to introduce reverse oscillation current, the current of the main switch begins to drop, and the main current begins to be transferred from the main switch to the oscillation circuit; (4) high voltage diode freewheeling stage (t)D0～tD1): at tD0And tD1After the current of the main switch is zero, the reverse oscillation current is conducted by the high-voltage follow current branch, the two ends of the main switch almost have no voltage at the moment, and the follow current process of the high-voltage follow current branch is the voltage zero rest time of the main switch; (5) positive TRV partial pressure phase (t)D1～tMOV): the positive TRV is applied to both ends of the main switch, and the high-voltage follow current branch circuit bears the reverse voltage, so that the high-voltage follow current branch circuitBy adopting the series thyristor assembly, higher reverse voltage can be endured. With the increase of the TRV, the voltage distribution relation of the vacuum circuit breaker and the SF6 circuit breaker which are connected in series is determined by a nonlinear resistor RN and a divided voltage RD, wherein the nonlinear resistor RN is connected at two ends of the vacuum switch in parallel, the nonlinear resistor is far larger than the divided voltage resistor in the initial TRV stage, the voltage is mainly born by the vacuum circuit breaker, and when the TRV reaches the protective voltage of the nonlinear resistor, the main voltage in the later stage is born by the SF6 circuit breaker; (6) energy absorption phase (t) of lightning arresterMOV～tDS): when the forward TRV reaches the action voltage of the lightning arrester, the lightning arrester starts to work, the current of the lightning arrester starts to increase, the current starts to be transferred from the oscillating circuit to the branch circuit of the lightning arrester, finally, the electric energy stored by the direct current system is completely absorbed by the lightning arrester, and when the current of the lightning arrester is reduced to zero, the isolating switch DS is switched off to complete the switching-on and switching-off of the direct current fault, so that the electrical isolation is realized.
The vacuum high-voltage direct-current circuit breaker adopts the vacuum circuit breaker and the SF6 circuit breaker which are connected in series to form the main switch, realizes the synergistic effect of dynamic voltage distribution and dynamic medium recovery through the divider resistor, fully exerts the advantages of high dynamic medium recovery speed of the vacuum circuit breaker and high dynamic medium strength of the SF6 circuit breaker, realizes advantage complementation and provides guarantee for high-voltage direct-current circuit breaker modules with higher voltage levels of 200kV and above. The high-voltage follow current branch is introduced to create 'zero voltage break', longer dynamic medium recovery time is provided for the main switch, the recovery strength of the dynamic medium of the main switch is higher, the current of the follow current branch is limited through the action of the current limiting resistor and the current limiting inductor of the follow current branch, the current of the series thyristor assembly is further reduced, and the cost of the series thyristor assembly is further reduced. The invention realizes the bidirectional on-off of the short-circuit fault through the quick identification of the short-circuit fault and the judgment of the short-circuit fault current direction. In a word, this novel hybrid high voltage direct current breaker voltage level is higher, simple structure, low cost, and control intelligence, the operation is reliable.
Drawings
Fig. 1 is a general structural view of the present invention.
Fig. 2 is a simplified circuit diagram of a forward short-circuit fault disconnect.
Fig. 3 is a working principle diagram of the novel hybrid direct current circuit breaker.
Fig. 4 is a simplified circuit diagram of a negative short-circuit fault disconnect.
FIG. 5 is a flow chart of the intelligent control system.
Fig. 6 is a structural diagram of a 500kV and 800kV extra-high voltage direct current circuit breaker.
Detailed description of the invention
The invention will be further elucidated with reference to the drawing
The invention relates to a novel high-voltage direct-current circuit breaker with the overall structure as shown in figure 1, which is formed by connecting a vacuum arc extinguish chamber and an SF6 arc extinguish chamber in series, wherein a main switch comprises vacuum circuit breakers VIU of 10kV, 35kV and 72.5kV and SF of 35kV, 110kV and 220kV6The circuit breakers GIU are connected in series to form main switches with voltage levels of 50kV, 150kV and 250kV, and the two ends of the vacuum switch are connected with branching resistors R in parallelNThe two ends of the SF6 breaker are connected with a divider resistor R in parallelDAnd the TRV is born by a vacuum circuit breaker in the initial period, and the TRV is born by an SF6 circuit breaker in the later period. The oscillating circuit comprises a positive oscillating circuit and a negative oscillating circuit, mainly meets the requirement of bidirectional direct current breaking, when a main current is from left to right, the positive oscillating circuit L2, C2 and TVS2 work, when an intelligent controller quickly identifies the direction of a short-circuit fault, if the main current is a positive fault current, the positive short-circuit fault breaking simplified circuit is shown in figure 2, after the main switch is quickly opened, the positive oscillating circuit is triggered and conducted, intermediate-frequency oscillating current is introduced and superposed on the main switch to create a current zero point for the main switch, after the current of the main switch is zero-crossed, a positive series thyristor assembly SCR2 is triggered to be conducted, a reverse TRV is conducted through a high-voltage follow current branch, the reverse TRV is almost zero, the high-voltage follow current branch process is also called as voltage zero-break, when the current of the high-voltage follow current branch is zero-crossed, a zero-cross thyristor assembly SCR2 is switched off, and the positive TRV reaches two ends of the main switch and the high-voltage follow current branch, the insulation voltage of the high-voltage follow current branch circuit needs to be far higher than the highest voltage in the switching-on and switching-off process, and at the positive TRV stage, due to the action of the divider resistor, the vacuum switch in the main switch firstly bears TRV and waits for the nonlinear resistor RNAfter operation, the remaining TRVs are fully charged by the SF6 circuit breaker.
The charging control of the forward oscillating circuit capacitor is realized through a charging resistor R2 and a charging control switch CB2, when the charging control circuit works normally, the CB2 is switched on, and the forward oscillating circuit capacitor is charged through L2, R2 and CB2 to reach the rated voltage of a system. When a fault occurs, the charge control switch CB2 is rapidly opened. The oscillation frequency of the forward oscillation circuit is selected from 1 kHz-5 kHz, and the peak value of oscillation current reaches 17 kA. The negative short-circuit fault cut-off simplified circuit is shown in fig. 4, and the negative oscillating circuit works in the same way as the positive oscillating circuit. The difference is the corresponding negative-going tank circuit and the negative-going series thyristor assembly SCR1 during negative-going fault turn-off.
The high-voltage follow current branch circuit is composed of a current-limiting resistor R, a current-limiting inductor L and a positive direction and a negative direction series thyristor assembly which are connected in parallel in an inverse mode, wherein the series thyristor assembly is of a laminated structure, static and dynamic voltage sharing is achieved through a voltage sharing resistor, the rated current is 3kA, the pulse current reaches 10kA, and the current-limiting resistor R and the current-limiting inductor L are designed to be the maximum pulse current of 10 kA.
The high voltage disconnecting switch DS selects a corresponding high voltage direct current disconnecting switch according to the designed voltage class of the novel hybrid high voltage direct current circuit breaker.
As shown in fig. 5, the flow chart of the intelligent control system is that firstly, current detection is performed, whether a current peak value exceeds a rated current by 2 times and whether a current rising rate is greater than 2kA/ms are used as judgment conditions (adjusted according to an actual circuit), when a fault is judged, a charging control switch is switched off, a main switch is rapidly switched off, then, whether a short-circuit fault occurs is judged to be positive or negative, if the short-circuit fault occurs, a negative oscillation circuit is triggered to be conducted, whether the current of the main switch crosses zero is detected, if the current crosses zero, a negative series thyristor SCR1 is triggered to be conducted, and when the main current is less than 10A, an isolation switch DS is disconnected, so that the whole direct-current disconnection process is realized.
The structure that above-mentioned novel hybrid direct current breaker establishes ties and realizes 500kV, 800kV ultra-high voltage direct current breaker is shown in fig. 6, adopts the novel hybrid high voltage direct current breaker of 250kV to establish ties and can constitute ultra-high voltage direct current breaker, and isolator DS only needs one, and ultra-high voltage direct current isolator is selected to its voltage class, and oscillating circuit electric capacity charging circuit need increase charging capacitor C0 in order to reduce charging voltage in addition. In addition, the ultra-high voltage implementation mode can adopt a main switch formed by a plurality of vacuum and SF6 circuit breakers connected in series to be used as a main switch of an ultra-high voltage direct current circuit breaker, an oscillating circuit, a high-voltage follow current branch circuit, a lightning arrester and the like to be connected in series or selected according to corresponding voltage grades.
The above-described embodiments are merely preferred embodiments of the present invention, but the scope of the present invention is not limited thereto, and structural equivalents and modifications thereof are intended to be included in the scope of the present invention.
Claims (5)
1. High voltage direct current circuit breaker based on vacuum and SF6 explosion chamber establish ties, including main switch, divider resistance, isolator, high-pressure afterflow branch road, oscillating current branch road, arrester, current detection and intelligent control ware, its characterized in that: the vacuum circuit breaker is connected in series with SF6 circuit breaker as main switch, the main switch, oscillation current branch, lightning arrester and high-voltage follow current branch are connected in parallel to form a breaking unit, the isolating switch is connected in series with the breaking unit, the high-voltage follow current branch is formed by connecting a current-limiting resistor, a current-limiting inductor and a series thyristor component in series, and the divider resistor adopts a nonlinear resistor RNAnd a voltage dividing resistor RDThe high-voltage follow current branch circuit is used as a main switch after current zero crossing, so that longer medium recovery time and strength can be obtained, and intelligent detection and intelligent control of the whole machine can be realized by the current detection and intelligent controller.
2. High voltage direct current circuit breaker based on vacuum in series with an SF6 arc chute according to claim 1, characterized in that: the main switch is composed of a vacuum circuit breaker VIU and an SF6 circuit breaker GIU which are connected in series, a voltage dividing resistor is connected in parallel at two ends of the vacuum circuit breaker and an SF6 circuit breaker, wherein two ends of the vacuum circuit breaker are connected in parallel with a nonlinear resistor RNAnd the two ends of the SF6 breaker are connected with a divider resistor R in parallelDIn the process of opening and closing, when the voltage at two ends of the vacuum circuit breaker is far less than the nonlinear resistor RNAt operating voltage of (3), RNFar greater than RDWhen the non-linear resistor is over-voltageThen, the nonlinear resistor R is usedNConstant voltage is borne, the whole main switch voltage is mainly borne by the SF6 circuit breaker, the advantages of high recovery speed of the dynamic medium of the vacuum circuit breaker and high recovery strength of the dynamic medium of the SF6 circuit breaker are fully exerted, and the cooperative gain effect of the series fracture is realized.
3. High voltage direct current circuit breaker based on vacuum in series with an SF6 arc chute according to claim 1, characterized in that: when the current is from the direction of the isolating switch to the disconnecting unit to indicate positive direction and from the disconnecting unit to indicate negative direction, the reactor L2, the energy storage capacitor C2 and the vacuum trigger switch TVS2 are connected in series to form a positive direction oscillation circuit, the reactor L1, the energy storage capacitor C1 and the vacuum trigger switch TVS1 are connected in series to form a negative direction oscillation circuit, and the positive direction oscillation circuit and the negative direction oscillation circuit are connected in parallel at two ends of the main switch; a charging resistor R2 and a charging control switch CB2 carry out charging control on a capacitor C2, one end of the charging resistor R2 is grounded, the other end of the charging resistor R2 is connected to one end of a CB2, the other end of the CB2 is connected to the serial connection of the TVS2 and the C2, the charging resistor R1 and a charging control switch CB1 carry out charging control on the capacitor C1, one end of the charging resistor R1 is grounded, the other end of the charging resistor R1 is connected to one end of the CB1, and the other end of the CB1 is connected to the serial connection of the TVS1 and the C1; when the main current is in the positive direction, the short-circuit current is rapidly increased after the fault occurs, after the main switch is switched off, the TVS2 is triggered to be conducted, the C2 and the L2 oscillate to generate intermediate-frequency current which is superposed in the current of the main switch to create a current zero-crossing point for the main switch, the main switch can complete arc extinction, and when the main current is in the negative direction, the TVS1 is triggered to be conducted to create a current zero-crossing point when the short-circuit fault occurs.
4. High voltage direct current circuit breaker based on vacuum in series with an SF6 arc chute according to claim 1, characterized in that: the high-voltage follow current branch circuit consists of a current-limiting resistor R, a current-limiting inductor L, a series thyristor assembly SCR1 and an SCR2, wherein the series thyristor assembly has a voltage-sharing resistor RGRealize that its static and dynamic voltage-sharing, current-limiting resistance R and current inductance L are used for restricting the current of high-pressure afterflow branch, and then reduce the thyristor assembly of series connectionThe current reduces the cost of the thyristor component, a high-voltage follow current branch is introduced, the corresponding thyristor component is controlled to be conducted at the initial stage of the reverse TRV, the reverse TRV is conducted through the thyristor component, the follow current process almost without the reverse TRV is realized, the voltage zero rest is adopted at the stage, when the forward TRV is applied to the main switch and the series thyristor component, the voltage born by the series thyristor component is far higher than the highest TRV in the switching-on and switching-off process, and then the main switch obtains longer dynamic medium recovery time after the voltage zero rest time, and then bears the forward TRV to achieve higher dynamic medium recovery strength.
5. High voltage direct current circuit breaker based on vacuum in series with an SF6 arc chute according to claim 1, characterized in that: the system control process of the intelligent controller comprises the following steps: firstly, current detection is carried out, whether a current peak value exceeds a rated current by 2 times or not and whether a current rising rate is more than 2kA/ms are used as judgment conditions, when a fault occurs, a charging control switch is switched off, a main switch is rapidly switched off, then whether a short-circuit fault is positive or negative is judged, if the short-circuit fault is negative, a negative oscillation circuit is triggered to be conducted, whether the current of the main switch crosses zero is detected and judged, if the short-circuit fault crosses zero, the negative serial thyristor assembly SCR1 is triggered to be conducted in a pulse mode, and when the main current is less than 10A, an isolating switch DS is switched off, so that the whole direct-current switching-off process is realized.
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| CN111404127A (en) * | 2020-03-10 | 2020-07-10 | 清华大学 | Natural commutation type hybrid direct current circuit breaker and current turn-off method of direct current system |
| CN112383032B (en) * | 2020-09-30 | 2022-05-20 | 四川大学 | Thyristor-based active direct current breaker and control method thereof |
| CN112435889A (en) * | 2020-12-01 | 2021-03-02 | 郑州大学 | High-voltage integrated static and dynamic self-voltage-sharing vacuum arc extinguish chamber |
| WO2022218575A1 (en) * | 2021-04-17 | 2022-10-20 | Eaton Intelligent Power Limited | Direct current quenching at a disconnector switch |
| CN113410824B (en) * | 2021-06-15 | 2022-05-27 | 广东电网有限责任公司广州供电局 | High-voltage alternating-current rapid switch equipment |
| CN113612193B (en) * | 2021-07-19 | 2022-05-06 | 西安交通大学 | High-voltage direct-current circuit breaker based on vacuum trigger switch and superconducting current limiting and working method |
| CN114629077A (en) * | 2021-12-14 | 2022-06-14 | 浙江大学 | High-speed vacuum direct current limiting circuit breaker |
| CN114582684A (en) * | 2021-12-14 | 2022-06-03 | 浙江大学 | Current-limiting circuit breaker high-speed contact driving mechanism based on electromagnetic force |
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