CN204271661U - A kind of shunt reactor Intelligent switching device - Google Patents
A kind of shunt reactor Intelligent switching device Download PDFInfo
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- CN204271661U CN204271661U CN201420872068.4U CN201420872068U CN204271661U CN 204271661 U CN204271661 U CN 204271661U CN 201420872068 U CN201420872068 U CN 201420872068U CN 204271661 U CN204271661 U CN 204271661U
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- 238000000034 method Methods 0.000 abstract description 9
- 238000011084 recovery Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 6
- 238000002485 combustion reaction Methods 0.000 description 11
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The utility model discloses a kind of shunt reactor Intelligent switching device, comprise bus, the three-phase electric-linked SF6 circuit breaker be connected with bus, the shunt reactor, the intelligent phase selection device that are connected with the electric-linked SF6 circuit breaker of three-phase, current transformer is in series with between the electric-linked SF6 circuit breaker of three-phase and bus, the secondary circuit of current transformer is connected with intelligent phase selection device, bus is also provided with voltage transformer, and the secondary circuit of voltage transformer is connected with intelligent phase selection device.The utility model has the advantages that: to breaker open operation process implementation Based Intelligent Control, during guarantee each phase blow-out of circuit breaker, between fracture, dielectric strength is all enough to the intensity tolerating recovery voltage.
Description
Technical field
The utility model relates to a kind of shunt reactor Intelligent switching device.
Background technology
35kV shunt reactor is mainly used in reactive power compensation in electric power system, needs to carry out switching to these reactors in time when System Reactive Power changes.In recent years, there occurs a lot of accident caused due to switching overvoltage when switching shunt reactor, these accidents gently then cause overvoltage protection action (as lightning arrester etc.), and serious will cause equipment burnout, even explode.Line side switching overvoltage during aircraft carrier line switching shunt reactor even can cause institute's loss on transmission to ruin, the faults such as main transformer terminal short-circuit.The safe operation of electric power system and the personal safety of power station operation maintenance personnel in the superpotential problem serious threat of 35kV shunt reactor switching.
To shunt reactor switching overvoltage mechanism of production, there is a lot of very ripe achievement in research.Think that the superpotential generation of shunt reactor switching mainly contains following reason at present: (1) cut-off overvoltage.When circuit breaker is when cut-offfing inductive small area analysis, because electric arc is unstable, before current over-zero, there will be current chopping phenomenon.Shunt reactor switching equivalent circuit is based on electric capacity, inductance, and this loop voltage electric current can not suddenly change, and dams and must cause strong electromagnetic viscosimeter, cause overvoltage.(2) resume combustion overvoltage.If between fracture, recovery voltage climbing is greater than insulation recovery speed in circuit breaker interrupting process, fracture can be punctured generation resume combustion overvoltage by recovery voltage.After resume combustion occurs, occur high-frequency current between breaker fracture, during high-frequency current zero passage, fracture is blow-out again, because fracture is opened apart from not after blow-out, will occur resume combustion.Due to overvoltage effect, fracture repeats " cut-offfing-resume combustion " this process, until when insulation distance between fracture is enough large, and arc extinction.Through statistics; single cut-offs middle resume combustion number of times and is up to 128 times; three-phase resume combustion process duration reaches 5ms most; rear resume combustion phase rate of rise of transient recovery voltage can up to 13kV/ μ s; in unprotect situation, alternate overvoltage can more than 8.0pu; relatively overvoltage all can more than 4.0pu, serious threat device security.
Shunt reactor switching overvoltage braking measure conventional at present mainly installs zinc oxide arrester and RC resistance-capacitance absorption device in the line, and these intelligence methods implement complexity, cost is high, and are not enough to effectively administer shunt reactor switching overvoltage.
Utility model content
For solving the problem, the purpose of this utility model is to provide a kind of shunt reactor Intelligent switching device, the electric-linked SF6 circuit breaker of three-phase is adopted to carry out switching shunt reactor, in shunt reactor process out of service, switching after three-phase electric-linked SF6 circuit breaker current zero passage was realized by intelligent phase selection device, ensure that the dielectric strength of each phase circuit breaker again between blow-out moment fracture is all enough to tolerance recovery voltage intensity, thus avoid first opening and mutually resume combustion occurs, effectively administer the generation of shunt reactor switching overvoltage.
In order to solve the problems of the technologies described above, the utility model is achieved through the following technical solutions: a kind of shunt reactor Intelligent switching device, comprise bus, the electric-linked SF6 circuit breaker of the three-phase be connected with bus, the shunt reactor be connected with the electric-linked SF6 circuit breaker of three-phase, intelligent phase selection device, current transformer is in series with between the electric-linked SF6 circuit breaker of described three-phase and bus, the secondary circuit of described current transformer is connected with intelligent phase selection device, described bus is also provided with voltage transformer, the secondary circuit of described voltage transformer is connected with intelligent phase selection device.
A kind of operation/cutting method adopting shunt reactor Intelligent switching device, first the electric-linked SF6 circuit breaker of three-phase is in "on" position shunt reactor and normally runs, after intelligent phase selection device receives separating brake instruction, detect voltage transformer voltage signal, intelligent phase selection device sends out separating brake instruction to respectively the electric-linked SF6 circuit breaker of three-phase by the decay time of setting, controls the firm branch of contact of each phase of three-phase electric-linked SF6 circuit breaker all at voltage 90 ° of Angle Position.
Compared with prior art, the utility model has the advantages that: adopt the electric-linked SF6 circuit breaker of three-phase and intelligent phase selection device, to breaker open operation process implementation Based Intelligent Control, during guarantee each phase blow-out of circuit breaker, between fracture, dielectric strength is all enough to the intensity tolerating recovery voltage, thus fundamentally avoids the generation of shunt reactor switching overvoltage.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of shunt reactor Intelligent switching device of the utility model;
Fig. 2 is three-phase intelligent phase-controlled schematic diagram.
Embodiment
Consulting Fig. 1 is a kind of shunt reactor Intelligent switching device of the utility model, comprise bus 1, the three-phase electric-linked SF6 circuit breaker 3 be connected with bus 1, the shunt reactor 4, the intelligent phase selection device 6 that are connected with the electric-linked SF6 circuit breaker 3 of three-phase, current transformer 2 is in series with between the electric-linked SF6 circuit breaker 3 of described three-phase and bus 1, the secondary circuit of described current transformer 2 is connected with intelligent phase selection device 6, described bus 1 is also provided with voltage transformer 5, and the secondary circuit of described voltage transformer 5 is connected with intelligent phase selection device 6.
A kind of operation/cutting method adopting shunt reactor Intelligent switching device, first the electric-linked SF6 circuit breaker of three-phase is in "on" position shunt reactor and normally runs, after intelligent phase selection device receives separating brake instruction, detect voltage transformer voltage signal, intelligent phase selection device sends out separating brake instruction to respectively the electric-linked SF6 circuit breaker of three-phase by the decay time of setting, control the firm branch of contact of each phase of three-phase electric-linked SF6 circuit breaker all at voltage 90 ° of Angle Position, i.e. electric current 0 ° of position, ensure that the arcing time of each phase all maximizes, thus avoid the generation of shunt reactor switching overvoltage.
As shown in Figure 2, Ia, Ib, Ic are respectively three-phase shunt reactor electric current, and t1, t2. and t3 are A phase respectively, B phase and C phase arcing contact just divide the moment.T is current cycle, for 50Hz system, and T=20ms.Ta is the A phase arcing time, and tb is the B phase arcing time, and tc is the C phase arcing time.△ t is A phase blow-out time and B, C phase blow-out time difference, for isolated neutral system △ t=5ms.
A phase is separated at t1 moment arcing contact, and the arcing time is ta=T/2; B phase is separated at t2 moment arcing contact, arcing time tb=T/6+5ms; C phase is separated at t3 moment arcing contact, arcing time tc=T/3+5ms.
Controlled by intelligent phase selection device, the three-phase electric-linked SF6 circuit breaker arcing time all reaches maximum, in the blow-out moment, all has enough dielectric strengths to tolerate the intensity of recovery voltage between fracture.
For the electric-linked SF6 circuit breaker of 30.5kV three-phase, the test of its switching shunt reactor shows, when the arcing time is greater than 5ms, resume combustion probability is extremely low.So the control strategy described in this example fundamentally can effectively administer shunt reactor switching overvoltage.
Employing can the electric-linked SF6 circuit breaker of three-phase of phase-controlled, in separating brake process, by intelligent phase selection device, control each phase arcing contact just to divide at current zero-crossing point, realize the maximization of three-phase breaker arcing time, improve the dielectric strength of circuit breaker blow-out moment fracture, thus avoid resume combustion occurring, the generation of shunt reactor switching overvoltage.
The foregoing is only specific embodiment of the utility model, but technical characteristic of the present utility model is not limited thereto, any those skilled in the art is in field of the present utility model, and the change done or modification are all encompassed among the scope of the claims of the present utility model.
Claims (1)
1. a shunt reactor Intelligent switching device, it is characterized in that: comprise bus, the three-phase electric-linked SF6 circuit breaker be connected with bus, the shunt reactor, the intelligent phase selection device that are connected with the electric-linked SF6 circuit breaker of three-phase, current transformer is in series with between the electric-linked SF6 circuit breaker of described three-phase and bus, the secondary circuit of described current transformer is connected with intelligent phase selection device, described bus is also provided with voltage transformer, and the secondary circuit of described voltage transformer is connected with intelligent phase selection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420872068.4U CN204271661U (en) | 2014-12-31 | 2014-12-31 | A kind of shunt reactor Intelligent switching device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420872068.4U CN204271661U (en) | 2014-12-31 | 2014-12-31 | A kind of shunt reactor Intelligent switching device |
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| CN204271661U true CN204271661U (en) | 2015-04-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578105A (en) * | 2014-12-31 | 2015-04-29 | 国家电网公司 | Intelligent switching device and method of paralleling reactor |
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2014
- 2014-12-31 CN CN201420872068.4U patent/CN204271661U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578105A (en) * | 2014-12-31 | 2015-04-29 | 国家电网公司 | Intelligent switching device and method of paralleling reactor |
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