CN109245024A - A kind of change of current break-up device and method of direct-current vacuum switch - Google Patents
A kind of change of current break-up device and method of direct-current vacuum switch Download PDFInfo
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- CN109245024A CN109245024A CN201811082729.2A CN201811082729A CN109245024A CN 109245024 A CN109245024 A CN 109245024A CN 201811082729 A CN201811082729 A CN 201811082729A CN 109245024 A CN109245024 A CN 109245024A
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- current
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- auxiliary switch
- vacuum switch
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/06—Arrangements for supplying operative power
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
Abstract
The invention discloses a kind of change of current break-up devices of direct-current vacuum switch, including the varistor RV and forced commutation circuit being connected in parallel between vacuum switch S two end terminals J1 and J2, the forced commutation circuit is in series by recharged capacitance C, inductance L and auxiliary switch, and the auxiliary switch includes S1, S2, S3 and S4；Also disclose change of current method for dividing, the impressed current transfer circuit being made of recharged capacitance C, inductance L and auxiliary switch S1~S4 realizes the change of current disjunction of vacuum switch S, in vacuum switch S electric current transfer process, by the switching for flexibly controlling auxiliary switch S1, S2, S3 or S4, it can effectively reduce the current changing rate near before vacuum switch S current over-zero, substantially recovery voltage neighbouring after reduction vacuum switch current over-zero, to be obviously improved the reliability of the quick disjunction D.C. high-current of vacuum switch.
Description
Technical field
The invention belongs to electric power system fault protection technique fields, and in particular to a kind of change of current disjunction of direct-current vacuum switch
Device and its change of current method for dividing.
Background technique
With greatly developing for direct current transmission and distribution technology in recent years, equipment, dc circuit breaker are protected as core therein
Obtain the extensive concern of domestic and international relevant industries.Since DC current does not have natural zero-crossing point, phase is cut-off with conventional exchanging
Than direct current cut-offs very difficult.Direct current cut-offs technology and the key task solved is needed to be quickly to manufacture current zero-crossing point, and
Fast quick-recovery insulation, bears the recovery voltage in interrupting process after current over-zero.
Artificial zero-based dc circuit breaker utilizes the short circuit in the reversed high-frequency current and main switch of the offer of LC converter circuit
The disjunction of DC current zero passage is realized in electric current superposition, and structure is simple, technology maturation, has comprehensive advantage compared to other schemes.
Under the premise of not influencing the quick change of current, prior art passes through in vacuum switch S branch series connection saturation reactance
Device LS, the circuit equivalent inductance near current over-zero is significantly increased, the limitation to change rate near current over-zero is realized, such as schemes
Shown in 2.Due to saturable reactor LSIt needs that load current is connected for a long time, biggish heating loss can be generated, need optional equipment
Heat dissipation equipment；It is saturated in addition, can actually be exited rapidly before current over-zero and is able to maintain that enough low current change rates are held
The saturable reactor design of continuous time is more difficult, and otherwise reactor volume will be significantly increased.
In order to improve the recovery voltage characteristic in breaking course, Fig. 3 technical solution by the both ends vacuum switch S reversely simultaneously
Union II pole pipe D, after vacuum switch current over-zero, afterflow is connected in diode D, until in this period of time that afterflow process terminates
The recovery voltage of vacuum switch S is limited in lower level.The program needs to additionally introduce diode D, and is difficult to realize
Otherwise the bi-directional symmetrical breaking function of vacuum switch S needs to additionally introduce other equipment again.
Summary of the invention
In order to overcome the shortcomings and deficiencies of the prior art, one of the objects of the present invention is to provide a kind of novel direct current is true
It is spaced apart and closes change of current break-up device, effectively promotes the reliability of the quick disjunction mesohigh D.C. high-current of vacuum switch.
The technical solution adopted by the present invention to solve the technical problems is as follows: a kind of change of current disjunction dress of direct-current vacuum switch
It sets, including the varistor RV and forced commutation circuit being connected in parallel between vacuum switch S two end terminals J1 and J2, described is forced
Converter circuit is in series by recharged capacitance C, inductance L and auxiliary switch, and the auxiliary switch includes being connected to terminal J1
Auxiliary switch S1 between recharged capacitance C, the auxiliary switch S2 being connected between recharged capacitance C and terminal J2, connection
Auxiliary switch S3 between the terminal J1 and inductance L and auxiliary switch S4 being connected between inductance L and terminal J2.
The second object of the present invention is to provide the method for dividing of above-mentioned direct-current vacuum switch change of current break-up device, step
Are as follows:
1), when main loop DC current flows to terminal J2 by terminal J1, vacuum switch S disjunction first generates electric arc；So
Auxiliary switch S1, S4 are connected afterwards, and recharged capacitance C is made up of inductance L- auxiliary switch S4- vacuum switch S- auxiliary switch S1
Circuit electric discharge generate pulse current iC, effective change of current electric current is i at this timecom=iC, force the electric current i in vacuum switch SSRapidly
Reduce；In the electric current iSA certain moment Δ t1 near before being reduced to zero, connects auxiliary switch S2, and the pulse current (is put
Electric current) iCIn one part of current iS2It is flowed through from auxiliary switch S2, effective change of current electric current is i at this timecom=iC-iS2, thus
Current changing rate near before reduction vacuum switch S current over-zero；
2) it, when main loop DC current flows to terminal J1 by terminal J2, after vacuum switch S disjunction generates electric arc, connects
Auxiliary switch S2, S3, recharged capacitance C pass through the circuit that inductance L- auxiliary switch S3- vacuum switch S- auxiliary switch S2 is constituted
Electric discharge generates pulse current iC, effective change of current electric current is i at this timecom=iC, force the electric current i in vacuum switch SSIt is reduced rapidly；?
The electric current iSA certain moment Δ t1 near before being reduced to zero connects auxiliary switch S1, pulse current (discharge current) iC
In one part of current iS1It is flowed through from auxiliary switch S1, effective change of current electric current is i at this timecom=iC-iS1, opened to reduce vacuum
Current changing rate near before the S current over-zero of pass.
Wherein, in the step 1) and commutation course 2), since the auxiliary switch S2 or S1 is in the vacuum switch S
Nearby conducting shunts before current over-zero, makes effective change of current electric current icomIt is obviously reduced, as a result the vacuum switch S electric current mistake
Current changing rate near before zero is greatly reduced.
Wherein, after the step 1) and the change of current 2), due to the conducting voltage clamper of the auxiliary switch S2 or S1
Effect makes the recovery voltage near after the vacuum switch S current over-zero be restricted to the conducting of the auxiliary switch S1 and S2
The sum of pressure drop, the as a result described peak value for restoring voltage and its change rate are substantially reduced, and are able to maintain the regular hour
Δt2；The characteristic for restoring voltage before the vacuum switch S current over-zero after current changing rate and its zero passage improves, and can effectively mention
Rise the reliability of quick disjunction D.C. high-current.
The beneficial effects of the present invention are: only can substantially be dropped by the flexible control to converter circuit auxiliary switch switching
Current changing rate near before low vacuum switch S current over-zero can be substantially reduced vacuum switch S electricity without increasing other equipment
Recovery voltage and its change rate near after flowing through zero, and the duration in the low current change rate section can be freely adjusted on demand
Δ t1 reduces the volume of whole device to effectively promote the reliability of the quick disjunction D.C. high-current of vacuum switch, reduce at
Originally, while more conveniently realize the bi-directional symmetrical breaking function of vacuum switch S.
Detailed description of the invention
Fig. 1 is the existing dc circuit breaker commutation circuit topology for improving current changing rate；
Fig. 2 is the existing dc circuit breaker commutation circuit topology for improving and restoring voltage；
Fig. 3 is the major loop topological project that direct-current vacuum of the invention switchs change of current break-up device；
Fig. 4 is the equivalent circuit of first stage commutation course when electric current of the present invention flows to J2 from terminal J1；
Fig. 5 is the equivalent circuit of second stage commutation course when electric current of the present invention flows to J2 from terminal J1；
Fig. 6 is the equivalent circuit of first stage commutation course when electric current of the present invention flows to J1 from terminal J2；
Fig. 7 is the equivalent circuit of second stage commutation course when electric current of the present invention flows to J1 from terminal J2；
Fig. 8 is that the electric current of vacuum switch S in typical scenario and the present invention program change of current breaking course compares；
Fig. 9 is that the voltage of vacuum switch S in typical scenario and the present invention program change of current breaking course compares.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
Referring to shown in Fig. 3, the invention discloses a kind of change of current break-up devices of direct-current vacuum switch, including are connected in parallel on vacuum
Varistor RV and forced commutation circuit between switch S two end terminals J1 and J2, the forced commutation circuit is by being pre-charged
Capacitor C, inductance L and auxiliary switch are in series, and the auxiliary switch includes being connected between terminal J1 and recharged capacitance C
Auxiliary switch S1, be connected between recharged capacitance C and terminal J2 auxiliary switch S2, be connected to terminal J1 and inductance L it
Between auxiliary switch S3 and the auxiliary switch S4 that is connected between inductance L and terminal J2.
Wherein, load current is connected in vacuum switch S long secondary closure；Recharged capacitance C, inductance L and auxiliary switch series connection structure
At forced commutation circuit, the change of current disjunction of vacuum switch S is realized；Limit of the varistor RV for overvoltage in direct current breaking course
System and energy absorption；Auxiliary switch S1, auxiliary switch S2, auxiliary switch S3 and auxiliary switch S4 are realized to forced commutation circuit
Switching control.
Embodiment 1
When main loop DC current flows to terminal J2 by terminal J1, in change of current breaking course, referring to Fig. 4 and Fig. 5 institute
Show, vacuum switch S disjunction first generates electric arc；Then auxiliary switch S1, S4 is connected, and recharged capacitance C passes through inductance L-
The circuit electric discharge that auxiliary switch S4- vacuum switch S- auxiliary switch S1 is constituted generates pulse current iC, then effective change of current electric current be
icom=iC, force the electric current i in vacuum switch SSIt is reduced rapidly；In electric current iSA certain moment Δ t1 near before being reduced to zero, it is auxiliary
Switch S2 is helped to connect, then pulse current (discharge current) iCIn one part of current iS2It flows through from auxiliary switch S2, effectively changes
Galvanic electricity stream is reduced to icom=iC-iS2, thus the curent change process near before substantially slowing down vacuum switch S current over-zero；Surely
It is spaced apart after closing S current over-zero, since auxiliary switch S1 and S2 is in the conductive state simultaneously, and its conduction voltage drop is smaller, is assisting
A period of time Δ t2 before switch S2 blocking, can be by recovery voltage clamping neighbouring after vacuum switch S current over-zero lower
It is horizontal.
Embodiment 2
When main loop DC current flows to terminal J1 by terminal J2, in change of current breaking course, institute referring to figure 6 and figure 7
Show, after the vacuum switch S disjunction generates electric arc, auxiliary switch S2, S3 are connected, and recharged capacitance C is assisted by inductance L-
The circuit electric discharge that switch S3- vacuum switch S- auxiliary switch S2 is constituted generates pulse current iC, then effective change of current electric current is icom=
iC, force the electric current i in vacuum switch SSIt is reduced rapidly；In electric current iSA certain moment Δ t1 near before being reduced to zero, auxiliary are opened
It closes S1 to connect, then pulse current (discharge current) iCIn one part of current iS1It is flowed through from auxiliary switch S1, effective change of current electricity
Stream is reduced to icom=iC-iS1, thus the curent change process near before substantially slowing down vacuum switch S current over-zero；Surely it is spaced apart
After closing S current over-zero, since auxiliary switch S1 and S2 is in the conductive state simultaneously, and its conduction voltage drop is smaller, in auxiliary switch
A period of time Δ t2 before S1 blocking, can be by recovery voltage clamping neighbouring after vacuum switch S current over-zero in lower level.
Wherein, auxiliary switch S1~S4 connect moment Δ t1 can according to actual needs, and according to the change of current of vacuum switch S electricity
The parameters such as capacitor C and inductance L carry out free adjusting in stream, forced branch circuit, to ensure the high current change of current in vacuum switch S
In breaking course, with the low current change rate section of enough duration before current over-zero.
Vacuum switch electric current and recovery voltage ratio in technical solution of the present invention and existing typical scenario change of current breaking course
It is as shown in Figure 8 and Figure 9 compared with respectively.
Under identical change of current disjunction Parameter Conditions, technical solution of the present invention is by the electric current before vacuum switch S current over-zero
Change rate is reduced to 57A/ μ s from 355A/ μ s, and low current change rate duration of Δ t1 is about 120 μ s；Vacuum is opened
The approximate recovery voltage for increasing to about -6500V in step form is reduced to less than 100V after closing S current over-zero, and the low electricity
Pressing duration of Δ t2 is about 220 μ s.
The present invention improves the characteristic of electric current before and after vacuum switch current over-zero and recovery voltage, to vacuum switch high current
Reliable disjunction it is highly beneficial.
As can be seen that technical solution of the present invention without increase other equipment under conditions of, only by converter circuit
The current changing rate near before vacuum switch S current over-zero can be greatly reduced in the flexible control of auxiliary switch S1~S4 switching,
Recovery voltage and its change rate after being substantially reduced vacuum switch S current over-zero, and low current variation can be freely adjusted on demand
The duration of Δ t1 in rate section reduces entire to effectively promote the reliability of the quick disjunction D.C. high-current of vacuum switch
The volume of device, reduces cost, while more convenient the bi-directional symmetrical breaking function for realizing vacuum switch.
The above-described embodiments merely illustrate the principles and effects of the present invention, and the embodiment that part uses, for
For those skilled in the art, without departing from the concept of the premise of the invention, can also make it is several deformation and
It improves, these are all within the scope of protection of the present invention.
Claims (4)
1. a kind of change of current break-up device of direct-current vacuum switch, it is characterised in that: including being connected in parallel on vacuum switch S two end terminals J1
Varistor RV and forced commutation circuit between J2, the forced commutation circuit is by recharged capacitance C, inductance L and auxiliary
Help switch in series, the auxiliary switch includes the auxiliary switch S1 being connected between terminal J1 and recharged capacitance C, connects
Connect the auxiliary switch S2 between recharged capacitance C and terminal J2, the auxiliary switch S3 being connected between terminal J1 and inductance L with
And it is connected to the auxiliary switch S4 between inductance L and terminal J2.
2. a kind of direct-current vacuum based on claim 1 described device switchs change of current method for dividing, which is characterized in that step are as follows:
1) when, major loop DC current flows to terminal J2 by terminal J1, vacuum switch S disjunction first generates electric arc；Connect auxiliary
Switch S1, S4, the circuit electric discharge that recharged capacitance C is made up of inductance L- auxiliary switch S4- vacuum switch S- auxiliary switch S1
Generate pulse current iC, effective change of current electric current is i at this timecom=iC, force the electric current i in vacuum switch SSIt is reduced rapidly；Described
Electric current iSA certain moment Δ t1 before being reduced to zero connects auxiliary switch S2, the pulse current iCIn one part of current iS2
It is flowed through from auxiliary switch S2, effective change of current electric current is i at this timecom=iC-iS2, thus before reducing vacuum switch S current over-zero
Current changing rate；
2) it when, major loop DC current flows to terminal J1 by terminal J2, after vacuum switch S disjunction generates electric arc, connects auxiliary and opens
S2, S3 are closed, recharged capacitance C is discharged by the circuit that inductance L- auxiliary switch S3- vacuum switch S- auxiliary switch S2 is constituted to be produced
Raw pulse current iC, effective change of current electric current is i at this timecom=iC, force the electric current i in vacuum switch SSIt is reduced rapidly；In the electricity
Flow iSA certain moment Δ t1 before being reduced to zero connects auxiliary switch S1, the pulse current iCIn one part of current iS1From
It is flowed through in auxiliary switch S1, effective change of current electric current is i at this timecom=iC-iS1, to reduce the electricity before vacuum switch S current over-zero
Rheology rate.
3. direct-current vacuum according to claim 2 switchs change of current method for dividing, which is characterized in that the step 1) and 2)
In commutation course, nearby conducting shunts auxiliary switch S2 or S1 before vacuum switch S current over-zero, makes effective change of current electric current
icomIt is obviously reduced, neighbouring current changing rate is greatly reduced before vacuum switch S current over-zero.
4. direct-current vacuum according to claim 2 switchs change of current method for dividing, which is characterized in that the step 1) and 2)
After the change of current, the conducting voltage clamper of auxiliary switch S2 or S1 is acted on, and makes the recovery electricity near after vacuum switch S current over-zero
Pressure is restricted to the sum of the conduction voltage drop of auxiliary switch S1 and S2, and the peak value and its change rate for restoring voltage are substantially reduced,
And it is able to maintain regular hour Δ t2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811082729.2A CN109245024B (en) | 2018-09-17 | 2018-09-17 | A kind of change of current method for dividing of direct-current vacuum switch change of current break-up device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811082729.2A CN109245024B (en) | 2018-09-17 | 2018-09-17 | A kind of change of current method for dividing of direct-current vacuum switch change of current break-up device |
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| Publication Number | Publication Date |
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| CN109245024A true CN109245024A (en) | 2019-01-18 |
| CN109245024B CN109245024B (en) | 2019-11-05 |
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| CN201811082729.2A Active CN109245024B (en) | 2018-09-17 | 2018-09-17 | A kind of change of current method for dividing of direct-current vacuum switch change of current break-up device |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105281289A (en) * | 2015-11-20 | 2016-01-27 | 中国船舶重工集团公司第七一二研究所 | Bidirectional combined type direct current breaker and control method thereof |
| CN107086541A (en) * | 2017-06-05 | 2017-08-22 | 国家电网公司 | The hybrid circuit breaker and its cutoff method of a kind of two-way disjunction |
-
2018
- 2018-09-17 CN CN201811082729.2A patent/CN109245024B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105281289A (en) * | 2015-11-20 | 2016-01-27 | 中国船舶重工集团公司第七一二研究所 | Bidirectional combined type direct current breaker and control method thereof |
| CN107086541A (en) * | 2017-06-05 | 2017-08-22 | 国家电网公司 | The hybrid circuit breaker and its cutoff method of a kind of two-way disjunction |
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| CN109245024B (en) | 2019-11-05 |
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