CN110867839A - Overvoltage suppression circuit - Google Patents
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- CN110867839A CN110867839A CN201911212770.1A CN201911212770A CN110867839A CN 110867839 A CN110867839 A CN 110867839A CN 201911212770 A CN201911212770 A CN 201911212770A CN 110867839 A CN110867839 A CN 110867839A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/021—Current limitation using saturable reactors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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Abstract
The present invention relates to an overvoltage suppression circuit. The overvoltage suppression circuit comprises at least one high-coupling splitting reactor; the high-coupling split reactor comprises two groups of windings which are connected in parallel, the two groups of windings are respectively marked as a first winding and a second winding, two ends of the first winding are respectively connected with a quick switch in series, two ends of the quick switch are connected with a resistance-capacitance absorber in parallel, and the resistance-capacitance absorber is used for absorbing high voltage generated at the moment when the overvoltage suppression circuit is switched off. According to the high-coupling split reactor, the two ends of one winding of the high-coupling split reactor are respectively connected with the fast switch in series, and the conversion of the reactor between a current equalizing state and a current limiting state can be realized through the fast switch; this application still connects a resistance-capacitance absorber in parallel at quick switch's both ends for absorb the high voltage that overvoltage suppression circuit disconnection produced in the twinkling of an eye, further obviously reduces main circuit breaker's TRV steepness and amplitude, and parallelly connected resistance-capacitance absorber is more showing to restraining the amplitude effect.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to an overvoltage suppression circuit.
Background
With the increasing scale of the power grid, the short-circuit capacity of the power system is also rapidly improved, the maximum short-circuit capacity of a local area exceeds the cut-off limit of the current circuit breaker, and the safe and stable operation of the power system is seriously threatened. However, the cost and difficulty of further improving the breaking capability of the circuit breaker are huge, and the current limiting technology to limit the short-circuit current within a certain range is a feasible effective means, and attention is paid in recent years.
The basic idea of limiting the short-circuit current by using a current limiter is to serially connect a large impedance, such as a resistor or an inductor, into the circuit at the moment of the short-circuit, and the implementation modes generally include a superconducting type, a resonant type, a power electronic type, a split reactance type, a magnetic saturation type and the like. In contrast, a current limiter based on a High Coupled Split Reactor (HCSR) is economical and easy to implement at High voltage levels.
However, research finds that the system introduces a high-coupling splitting reactance current limiter, and in the working process of the current limiter, the process of current transfer and short-time series connection of a main breaker loop into the inductance of the current limiter can be involved, so that high overvoltage can be caused, the safety of the breaker on a fault current switch and power equipment is influenced, and the phenomenon that the TRV (transient recovery voltage) gradient is obviously increased or even exceeds the standard after the main breaker breaks the short-circuit current is caused. A common overvoltage suppression measure is a parallel capacitor, however, in order to control the recovery voltage rise rate of the main breaker below the cut-off standard, a method of simply connecting a capacitor in parallel with a current limiter is adopted, and the required parallel capacitance value is large. The capacitor not only needs to meet the capacitance requirement, but also needs to meet enough withstand voltage, and the engineering realization difficulty and the manufacturing cost can be greatly improved.
Disclosure of Invention
In view of the above, it is desirable to provide an overvoltage suppression circuit in view of the above problems.
An overvoltage suppression circuit comprising at least one high coupling split reactor; the high-coupling split reactor comprises two groups of windings which are connected in parallel, the two groups of windings are respectively marked as a first winding and a second winding, two ends of the first winding are respectively connected with a quick switch in series, two ends of the quick switch are connected with a resistance-capacitance absorber in parallel, and the resistance-capacitance absorber is used for absorbing high voltage generated at the moment when the overvoltage suppression circuit is switched off.
In one embodiment, the rc absorber includes a rc capacitor and a rc resistor, and the rc capacitor and the rc resistor are connected in series and then connected to two ends of the fast switch.
In one embodiment, the resistance value of the resistance-capacitance resistor ranges from 1 Ω to 1000 Ω.
In one embodiment, the fast switch comprises a plurality of fast switch units connected in series, and the resistance-capacitance absorber is connected in parallel at two ends of the whole fast switch units connected in series.
In one embodiment, two ends of each fast switch unit are further connected in parallel with a voltage-sharing capacitor respectively, and capacitance values of the voltage-sharing capacitors are equal.
In one embodiment, the overvoltage suppression circuit further comprises:
and the parallel capacitor is connected in parallel with two ends of the second winding.
In one embodiment, the capacitance value of the parallel capacitor is larger than that of the resistance-capacitance capacitor.
In one embodiment, when the overvoltage suppression circuit includes at least two high-coupling splitting reactors, each of the high-coupling splitting reactors is connected in series.
Based on the same inventive concept, the application also provides an overvoltage suppression circuit, which comprises two high-coupling splitting reactors with the same structure, wherein the two high-coupling splitting reactors are connected in series;
two ends of one winding of the two high-coupling splitting reactors are respectively connected with a fast switch in series; two ends of the other winding of the two high-coupling split reactors are connected with a parallel capacitor in parallel;
two ends of the quick switch are connected with a resistance-capacitance absorber in parallel, and the resistance-capacitance absorber is used for absorbing high voltage generated at the moment when the overvoltage suppression circuit is disconnected; the quick switch comprises a plurality of quick switch units which are connected in series, and two ends of each quick switch unit are respectively connected with a voltage-sharing capacitor in parallel.
In one embodiment, the resistor-capacitor absorber includes a resistor-capacitor and a resistor-capacitor resistor connected in series, and the resistance of the resistor-capacitor resistor is in a range of 1 Ω -1000 Ω.
According to the overvoltage suppression circuit, the two ends of one winding of the high-coupling splitting reactor are respectively connected with the quick switch in series, so that the high-coupling splitting reactor can be switched between the current equalizing/limiting states through the quick switches, when a line fails, one winding of the high-coupling splitting reactor can be disconnected through the quick switches, and the inductance of the other winding limits the fault current; on this basis, this application still connects in parallel a resistance-capacitance absorber at quick switch's both ends for absorb the high voltage that overvoltage suppression circuit disconnection produced in the twinkling of an eye further obviously reduces main circuit breaker's TRV steepness and amplitude, and parallelly connected resistance-capacitance absorber is more showing to restrain amplitude effect.
Drawings
Fig. 1 is a schematic structural diagram of an overvoltage suppression circuit according to a first embodiment;
fig. 2 is a schematic structural diagram of an overvoltage suppression circuit according to a second embodiment;
fig. 3 is a schematic structural diagram of an overvoltage suppression circuit according to a third embodiment;
FIG. 4 is a schematic diagram of an overvoltage suppression circuit according to a fourth embodiment;
fig. 5 is a simplified schematic diagram of a three-phase ground short circuit of a 550kV ultra-high voltage system in an embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
The present application describes a detailed operating principle of an overvoltage suppression circuit formed by a High Coupled Split Reactor (HCSR) as an example, and it can be understood that in some embodiments of the present application, the HCSR can be directly used to represent the High Coupled Split Reactor; the HCSR-based overvoltage suppression circuit mainly comprises an HCSR and a fast switch, wherein two ends of an inductor of one arm of the HCSR are respectively connected in series with a group of fast switches, and then are connected in parallel with the other arm of the HCSR. As a key component of the overvoltage suppression circuit, when two arms of the HCSR are subjected to current flow simultaneously, magnetic fluxes generated by coils of the two arms are mutually cancelled in a common magnetic circuit, and only a small leakage inductance is presented to the outside; when only one arm of the HCSR is through-current, the single-arm inductor appears as a large single-arm inductor to the outside, and the fault current can be limited. Therefore, the current equalizing/limiting characteristic of the HCSR can meet the requirements that the power grid presents low impedance when the current limiter is in normal working condition and is converted into high impedance current limiting when short-circuit fault occurs. The HCSR-based current limiter adopts a fast switch to realize the conversion of HCSR current equalizing/limiting states, the fast switch disconnects the branch of one arm of the HCSR in case of failure, and the single-arm inductance of the HCSR limits the failure current.
However, through research by the inventor of the present application, in a working process after a high-coupling split reactor HCSR is introduced into a power grid system, a process of current transfer and short-time series connection of a main breaker loop into a current limiter inductor can be involved, so that a high overvoltage can be caused, safety of the main breaker on a fault current switch and power equipment can be affected, and a TRV gradient phenomenon after the main breaker breaks a short-circuit current is obviously increased and even exceeds a standard can be caused. A common overvoltage suppression measure is a parallel capacitor, however, in order to control the recovery voltage rise rate of the main breaker below the cut-off standard, a method of simply connecting a capacitor in parallel with a current limiter is adopted, and the required parallel capacitance value is large. The capacitor not only needs to meet the capacitance requirement, but also needs to meet enough withstand voltage, and the engineering realization difficulty and the manufacturing cost can be greatly improved.
In view of the above, the present application is intended to provide a solution to the above technical problem, and the following embodiments will be detailed.
Please refer to fig. 1 for an auxiliary view, which is a schematic structural diagram of an overvoltage suppression circuit according to a first embodiment of the present application. Wherein HCSR represents a high coupling split reactor, L1 represents a first winding, L2 represents a second winding, CB represents a fast switch, and C3 and R form a resistance-capacitance absorber; specifically, the overvoltage suppression circuit of the present application may include at least one high coupling split reactor HCSR; the high-coupling split reactor HCSR comprises two groups of windings which are connected in parallel, wherein the two groups of windings are respectively marked as a first winding L1 and a second winding L2, two ends of the first winding L1 are respectively connected in series with a quick switch CB, the quick switch CB can be a vacuum quick circuit breaker, two ends of the quick switch CB are connected in parallel with a resistance-capacitance absorber (not shown in figure 1), and the resistance-capacitance absorber is used for absorbing high voltage generated at the moment of disconnection of the overvoltage suppression circuit. This application is through parallelly connected a resistance-capacitance absorber at the both ends of fast switch CB for absorb the high voltage that produces in overvoltage suppression circuit disconnection moment, can further obviously reduce main circuit breaker's TRV (transient recovery voltage) steepness and amplitude, and parallelly connected resistance-capacitance absorber is more showing to restraining the amplitude effect.
Further, with reference to fig. 1, the rc absorber of the present application may include a rc capacitor C3 and a rc resistor R, wherein the rc capacitor C3 and the rc resistor R are connected in series and then connected to two ends of the fast switch CB. Further, according to the actual needs of those skilled in the art, the resistance range of the resistance-capacitance resistor R may be set within 1 Ω to 1000 Ω, specifically, the resistance of the resistance-capacitance resistor R may be 10 Ω; similarly, according to the actual needs of those skilled in the art, the capacitance value of the resistance-capacitance capacitor C3 may be set within a range of 100nF to 300nF, specifically, the capacitance value of the resistance-capacitance capacitor C3 may be 100nF, the capacitance value of the resistance-capacitance capacitor C3 may be 150nF, the capacitance value of the resistance-capacitance capacitor C3 may be 200nF, and the capacitance value of the resistance-capacitance capacitor C3 may be 250 nF. By reasonably selecting the numerical values of the resistance-capacitance resistor R and the resistance-capacitance capacitor C3, the TRV and the gradient of the main circuit breaker under different short-circuit faults can be ensured to basically meet the T100 specification in GB1984-2014, namely, the peak value and the gradient of two key parameters TRV of the TRV are not more than 817kV and 2 kV/mu s respectively.
In some embodiments, referring to fig. 2, a schematic structural diagram of an overvoltage suppression circuit according to a second embodiment of the present application is provided. In addition to the structure of the first embodiment, the high-coupling split-reactor HCSR of the present embodiment further includes a parallel capacitor C2 connected in parallel to two ends of the second winding L2, and the capacitance of the parallel capacitor C2 may be set to be larger than the capacitance of the resistor-capacitor C3 in the resistor-capacitor absorber. A capacitor is connected in parallel with two ends of the second winding L2 of the high-coupling split reactor HCSR, so that a certain overvoltage suppression effect can be achieved.
In some embodiments, referring to fig. 3, a schematic structural diagram of an overvoltage suppression circuit according to a third embodiment of the present disclosure is shown. In addition to the structure of the first embodiment and the second embodiment, the fast switch CB in this embodiment may be configured to include a plurality of fast switch cells CB1 connected in series according to needs, and the rc absorbers in this embodiment are connected in parallel to two ends of each fast switch cell CB1 connected in series, that is, the rc absorbers in this embodiment are connected in parallel to two ends of the whole fast switch cell CB1 connected in series; specifically, the quick switching unit CB1 in this embodiment may be a vacuum quick breaker. Further, in order to realize the overvoltage suppression function of the fast switch unit CB1, in this embodiment, a voltage-sharing capacitor C1 is connected in parallel to each of the two ends of each fast switch unit CB1, the capacitance values of each voltage-sharing capacitor C1 may be equal, and the specific value may be selected or set according to the requirement of the actual application.
Further, on the basis of the foregoing embodiments, when the overvoltage suppression circuit of the present application includes at least two high-coupling split reactors HCSR, the high-coupling split reactors HCSR in the present embodiment may be connected in series, and the constituent structures of the high-coupling split reactors HCSR in the overvoltage suppression circuit may be the same. Therefore, the overvoltage suppression circuit can be applied to the condition that a plurality of high-coupling splitting reactors HCSR are connected in series.
Based on the same inventive concept, the application also provides an overvoltage suppression circuit, which can assist to refer to fig. 4, wherein the overvoltage suppression circuit can comprise two high-coupling splitting reactors HCSR with the same structure, and the two high-coupling splitting reactors HCSR are connected in series; the two high-coupling split reactors HCSR can be respectively marked as a high-coupling split reactor HCSR1 and a high-coupling split reactor HCSR 2; two ends of one winding (which may be all the winding L1) of the high-coupling split reactor HCSR1 are respectively connected in series with a fast switch (not shown in fig. 4), and two ends of the other winding (which may be all the winding L2) of the high-coupling split reactor HCSR1 are connected in parallel with a parallel capacitor C4; furthermore, two ends of the fast switch are also connected in parallel with a resistance-capacitance absorber (not shown in fig. 4), and the resistance-capacitance absorber is used for absorbing high voltage generated at the moment when the overvoltage suppression circuit is switched off; in this embodiment, the fast switch may include a plurality of fast switch units CB1 connected in series, the fast switch unit CB1 may be a vacuum fast breaker, and two ends of each fast switch unit CB1 are also connected in parallel with a voltage-sharing capacitor C1; similarly, two ends of one winding (which may be all the winding L1) of the high-coupling split reactor HCSR2 are respectively connected in series with a fast switch (not shown in fig. 4), and two ends of the other winding (which may be all the winding L2) of the high-coupling split reactor HCSR2 are connected in parallel with a parallel capacitor C5; further, in this embodiment, two ends of the fast switch are further connected in parallel with a resistor-capacitor absorber (not shown in fig. 4), and the resistor-capacitor absorber is used for absorbing a high voltage generated at the moment when the overvoltage suppression circuit is turned off; in this embodiment, the fast switch may include a plurality of fast switch units CB2 connected in series, fast switch unit CB2 may be a vacuum fast breaker, and a voltage-sharing capacitor C2 is further connected in parallel at two ends of each fast switch unit CB 2. It can be understood that, for the description of the parameters (e.g., the voltage-sharing capacitor, the parallel capacitor, the resistance-capacitance capacitor, and the resistance-capacitance resistor) in this embodiment, reference may be made to the description of the first, second, and third embodiments, which will not be further described herein.
Illustratively, taking a three-phase ground short circuit fault current of a 550kV ultra-high voltage system as an example, a simplified calculation circuit of a three-phase ground short circuit shown in fig. 5 is adopted, where UA, UB, and UC are ideal power supplies, LS, RS1, RS2, CS1, and CS2 are power supply parameters, 0.0102H, 0.136 Ω, 51 Ω, 3.26 μ F, and 0.035 μ F are respectively taken, and a resistive load RL is 88.4 Ω.
Referring to table 1, table 1 shows statistical maximum values of the peak value and the steepness of the transient recovery voltage TRV of the main circuit breaker under four short-circuit faults of three-phase grounding, two-phase ungrounded and single-phase grounding, according to the specification in GB1984-2014, the TRV of the 550kV main circuit breaker refers to the requirement of T100, the peak value and the steepness of the TRV of two key parameters should not exceed 817kV and 2kV/μ s, respectively, and it can be known from the table that the TRV peak value of the main circuit breaker meets the requirements under several calculation conditions, but under the conditions of three-phase grounding, two-phase grounding and two-phase interphase short circuit, the TRV steepness of the main circuit breaker obviously exceeds 2kV/μ s of the standard requirements. Although in the calculation, due to the fact that a power grid system model is simplified, distribution parameter selection, reactor modeling, breaker arc breaking and the like are inaccurate or incomplete, a calculation result may have a certain deviation from an actual situation, on the aspect of working condition analysis and comparison, it can be effectively shown that the TRV gradient after the main breaker is broken is remarkably increased or even exceeds the standard due to the fact that a current limiting reactor is introduced under a typical 90kA short-circuit current scene, and therefore the consequence of breaking is influenced, and overvoltage suppression measures need to be added.
Referring to table 2, table 2 shows statistical maximum values of the TRV peak value and the steepness of the vacuum fast circuit breaker inside the lower current limiter for four short-circuit faults, according to the requirements of the TRV of the 40.5kV vacuum fast circuit breaker with reference to T100 specified in GB1984-2014, the TRV peak value and the steepness of the S1 grade circuit breaker TRV should not exceed 69.5kV and 0.61kV/μ S, respectively, and the TRV peak value and the steepness of the S2 grade circuit breaker TRV should not exceed 76.4kV and 1.23kV/μ S, respectively. As can be seen from the table, the TRV peak value and the steepness of the vacuum fast breaker under several calculation conditions all meet the requirements of the TRV of the 40.5kV S2-class breaker.
Tables 3 to 5 show that, when the current limiter operates under the condition that capacitors are connected in parallel on the current limiter module (that is, a capacitor is connected in parallel at two ends of a winding of the HCSR), when the current limiter operates under the conditions of three-phase grounding, two-phase ungrounded short-circuit fault and single-phase grounding short-circuit fault, the amplitude of the TRV borne by the three-phase current limiter and the gradient data of the TRV of the main breaker are A, B, C respectively, it can be seen that, along with the increase of the parallel capacitors, the amplitude of the TRV borne by the vacuum fast breaker does not change obviously, and the amplitude of the TRV borne by the. According to the calculation result, at least a capacitor over 1100nF is required to be connected in parallel to the two ends of the current limiter module to enable the TRV amplitude and the TRV gradient of the main circuit breaker to meet the requirement of T100 in GB1984-2014 under the short-circuit fault working condition involved in the calculation.
From the analysis result of the scheme of the parallel capacitance at the two ends of the current limiter module, it can be seen that in order to control the steepness of the main circuit breaker TRV below 2kV/μ s specified by T100 in the standard GB1984-2014, the parallel capacitance at the two ends of the current limiter module is large, and the increase of the capacitance at the high voltage level causes the great increase of the cost and the increase of the volume. According to the conception of the application, the TRV amplitude and the gradient of the main circuit breaker can be further inhibited by the scheme that the capacitors are connected in parallel at the two ends of the current limiter module and the resistance-capacitance absorbers are connected in parallel at the two ends of the two series vacuum fast circuit breakers, so that the requirement on the parallel capacitors can be reduced by adopting the scheme.
Specifically, the calculation results are shown in tables 6-8, the steepness of the TRV of the main circuit breaker is guaranteed to be below 2 kV/mus, the overvoltage suppression scheme provided by the invention (see fig. 1-4 for assistance) is adopted, the two series vacuum fast circuit breakers are connected with the resistance-capacitance absorber in parallel on the basis of the capacitors connected in parallel at the two ends of the current limiter module, the steepness and amplitude of the TRV of the main circuit breaker can be further obviously reduced, the effect of the parallel resistance-capacitance on the suppression amplitude is more remarkable, and the requirements on the parallel capacitance value of the current limiter can be reduced on the premise of guaranteeing the overvoltage suppression effect, so that the manufacturing difficulty and the cost are reduced.
TABLE 1 TRV Peak and steepness statistical maximum of Main Circuit breaker under four short-circuit faults
TABLE 2 TRV Peak and steepness statistical maximum of four short-circuit faults for vacuum fast circuit breaker
TABLE 3 phase-limiter vacuum quick circuit breaker TRV amplitude (kV) and main circuit breaker TRV gradient (kV/mus) under different faults and parallel capacitance values
TABLE 4B-phase current limiter vacuum fast breaker TRV amplitude (kV) and main breaker TRV gradient (kV/mus) under different faults and parallel capacitance values
TABLE 5C-phase current limiter vacuum fast circuit breaker TRV amplitude (kV) and main circuit breaker TRV gradient (kV/mus) under different faults and parallel capacitance values
TABLE 6 phase A current limiter vacuum fast breaker TRV amplitude (kV) and main breaker TRV gradient (kV/mus) under different faults, capacitance, resistance-capacitance values
TABLE 7 phase B current limiter vacuum fast breaker TRV amplitude (kV) and main breaker TRV gradient (kV/mus) under different faults, capacitance, resistance-capacitance values
TABLE 8C-phase current limiter vacuum fast breaker TRV amplitude (kV) and main breaker TRV gradient (kV/mus) under different faults, capacitance, resistance-capacitance values
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An overvoltage suppression circuit, characterized in that the overvoltage suppression circuit comprises at least one high coupling split reactor; the high-coupling split reactor comprises two groups of windings which are connected in parallel, the two groups of windings are respectively marked as a first winding and a second winding, two ends of the first winding are respectively connected with a quick switch in series, two ends of the quick switch are connected with a resistance-capacitance absorber in parallel, and the resistance-capacitance absorber is used for absorbing high voltage generated at the moment when the overvoltage suppression circuit is switched off.
2. The overvoltage suppression circuit of claim 1, wherein the rc absorber comprises a rc capacitor and a rc resistor, and the rc capacitor and the rc resistor are connected in series and then connected across the fast switch.
3. The overvoltage suppression circuit of claim 2, wherein the resistance of the resistor-capacitor resistor is in a range of 1 Ω -1000 Ω.
4. The overvoltage suppression circuit of claim 1, wherein the fast switch comprises a plurality of fast switch units connected in series, and the rc absorber is connected in parallel across the whole of each fast switch unit connected in series.
5. The overvoltage suppression circuit according to claim 4, wherein two ends of each fast switching unit are further connected in parallel with a voltage equalizing capacitor, and the capacitance values of the voltage equalizing capacitors are equal.
6. The overvoltage suppression circuit of claim 2, further comprising:
and the parallel capacitor is connected in parallel with two ends of the second winding.
7. The overvoltage suppression circuit of claim 6, wherein a capacitance value of the parallel capacitor is greater than a capacitance value of the resistor-capacitor.
8. The overvoltage suppression circuit according to any one of claims 1-7, wherein when the overvoltage suppression circuit includes at least two high coupling splitting reactors, each of the high coupling splitting reactors is connected in series.
9. The overvoltage suppression circuit is characterized by comprising two high-coupling splitting reactors with the same structure, wherein the two high-coupling splitting reactors are connected in series;
two ends of one winding of the two high-coupling splitting reactors are respectively connected with a fast switch in series; two ends of the other winding of the two high-coupling split reactors are connected with a parallel capacitor in parallel;
two ends of the quick switch are connected with a resistance-capacitance absorber in parallel, and the resistance-capacitance absorber is used for absorbing high voltage generated at the moment when the overvoltage suppression circuit is disconnected; the quick switch comprises a plurality of quick switch units which are connected in series, and two ends of each quick switch unit are respectively connected with a voltage-sharing capacitor in parallel.
10. The overvoltage suppression circuit of claim 9, wherein the rc absorber comprises a rc capacitor and a rc resistor connected in series, and the rc resistor has a resistance value ranging from 1 Ω to 1000 Ω.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113312767A (en) * | 2021-05-21 | 2021-08-27 | 华中科技大学 | Design method and system of high-coupling split reactor |
| CN113312767B (en) * | 2021-05-21 | 2023-11-28 | 华中科技大学 | Design method and system of high-coupling split reactor |
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