CN209709686U - It is a kind of based on failure mutually through sentencing the arc-extinction device of phase mistake proofing switching technique - Google Patents
It is a kind of based on failure mutually through sentencing the arc-extinction device of phase mistake proofing switching technique Download PDFInfo
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- CN209709686U CN209709686U CN201920053529.8U CN201920053529U CN209709686U CN 209709686 U CN209709686 U CN 209709686U CN 201920053529 U CN201920053529 U CN 201920053529U CN 209709686 U CN209709686 U CN 209709686U
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Abstract
The utility model discloses a kind of based on failure mutually through sentencing the arc-extinction device of phase mistake proofing switching technique, comprising: contactor, the band impedance earth transformer being sequentially connected in series between system busbar and ground terminal, band the first current transformer of impedance earth transformer lower link；Contactor and with impedance earth transformers connected in parallel extinguishing arc Sofe Switch, extinguishing arc Sofe Switch the second current transformer of lower link；Contactor and extinguishing arc Sofe Switch pass through master controller and are controlled, and master controller accesses three-phase voltage signal.The utility model effectively increases the accuracy rate of earthing wire-selecting, and can quickly carry out earthing wire-selecting operation.
Description
Technical field
The utility model belongs to power distribution network ground connection arc-extinction device technical field, in particular to a kind of failure that is based on is mutually through sentencing phase
The arc-extinction device of mistake proofing switching technique.
Background technique
With the development of economy and society, power supply reliability requirement is higher and higher, currently, 35kV or less voltage class is matched
In net system, the most commonly used is exactly neutral non-effective grounding mode, neutral non-effective grounding mode include neutral point not
It being grounded, through grounding through arc and low resistance grounding mode, neutral non-effective grounding mode is easy to appear intermittent defect,
Having a rest property failure refers to that malfunction is intermittence, and wherein intermittent arc grounding failure accounts for significant proportion.Arc grounding
Failure refer to unstable intermittent electric arc repeatedly constantly extinguish and restrike and the failure that is formed, main cause is that insulator is old
Change, dampness and overhead transmission line broken string ground connection etc..When intermittent arc grounding occurs, fault point not completely with greatly connect it is dead,
Ground connection is repeated several times in a very short period of time, disconnects for fault point, and this intermittence arc phenomenon will cause operation of power networks state wink
Breath changes and leads to electromagnetic energy intense oscillations, while causing the higher-order of oscillation on the inductance capacitance circuit of failure phase and non-faulting phase
Overvoltage, the voltage magnitude of non-faulting phase is generally up to 3.15~3.5 times of phase voltages at this time.
In distribution network systems, when intermittent grounding fault occurs, since earth current is smaller, and the spy with instantaneity
Point, traditional protective relaying device without targetedly measure, cause the stream protection of outlet zero to be failure to actuate such phenomenon, cannot be fast
Speed excision faulty line, makes power distribution network be chronically at malfunction.Therefore, overvoltage caused by intermittent defect will be with female
One of the analysis emphasis of the reason of more feeder line successive failures and distribution neutral point arc-extinction device Results validity.
Switching mode arc-extinction device gradually starts to promote the use of in recent years.Earthing switch type arc-extinction device passes through failure phase, non-
Failure phase and the size of residual voltage judge singlephase earth fault, and failure is mutually directly realized metallic earthing in the device,
So that failure phase-to-ground voltage is reduced to zero, the electric arc of former fault point necessarily extinguishes, avoid the generation of arc overvoltage, and other two
The voltage-to-ground of phase then limits in the level of on-Line Voltage, guarantees the safe and reliable operation of power grid.But, it was also found that the dress in operation
It sets and has the disadvantage in that
1) system insulation is influenced there are high frequency overvoltage when shifting current in the fault point；
2) in failure involution, generating voltage transformer caused by residual voltage vibrates and shoving leads to voltage transformer fuse
Fusing, or even burn voltage transformer；Little Lan becomes, Wanda's change has problems；
3) it be easy to cause two-phase short circuit and ground fault when phase selection mistake, expands fault coverage and influence.
And when singlephase earth fault occurs, since traditional neutral non-effective grounding mode cannot constitute Low ESR
Short-circuit loop, earth short circuit current very little, neutral non-effective grounding mode system do not trip under singlephase earth fault, wink
When faulty insulator restore after continuous service, permanent fault passes through the lookups processing such as small current line selection, fault location.Current small electricity
Location design and device are flowed, is to acquire the size and Orientation of the zero sequence capacitance current of each branch when passing through single-phase fault and by not
The branch of singlephase earth fault, but domestic dedicated Small Electric Current Earthing And Routing Device coverage rate occur to determine for same analysis method
It is not high, and device route selection accuracy rate is low.
Utility model content
In view of the above-mentioned problems, the utility model provides a kind of extinguishing arc dress for mutually being sentenced phase mistake proofing switching technique based on failure
It sets, further includes the contactor being sequentially connected in series between system busbar and ground terminal, band including the three-phase line that system busbar is drawn
Impedance earth transformer, band the first current transformer of impedance earth transformer lower link；
Contactor and with impedance earth transformers connected in parallel extinguishing arc Sofe Switch, extinguishing arc Sofe Switch the second Current Mutual Inductance of lower link
Device；
Contactor and extinguishing arc Sofe Switch pass through master controller and are controlled, and master controller accesses three-phase voltage signal.
Preferably, the extinguishing arc Sofe Switch including three groups of failure phase earthing switches corresponding with three-phase line respectively and connects
Ground mistake proofing switch and transition resistance are constituted；
It connects after ground connection mistake proofing switch and transition resistance and connection and with three groups of fault grounds switches, three groups of failure phases
Earthing switch and ground connection mistake proofing switch are controlled by master controller, and failure circuitry phase is grounded.
Preferably, the three-phase line connection is with transient voltage detection unit.
Preferably, the transient voltage detection unit includes wideband voltage sensor and transient voltage recording controller.
Preferably, the contactor is vacuum contactor.
Preferably, the contactor is Integral three-phase contactor.
Preferably, the three-phase line is grounded by the secondary side of voltage transformer.
The utility model has the beneficial effects that:
1, for the utility model when single-phase earthing occurs for system, phase mistake proofing switching technique is mutually sentenced using failure can pass through inspection
Flow measurement crosses the electric current and dependent vector of transition resistance R in device, can quickly judgment means close phase correctness, if closing
Phase mistake can will close the other earthing switch disjunction of misphase, and phase selection, reaches phase selection error correcting capability again, can be staggered to avoid because of conjunction
System phase fault caused by accidentally；
2, the system zero sequence electricity generated when the system investment based on neutral point zero sequence impedance is opened with failure phase earthing switch
Recess feature is pressed, the zero-sequence current variation tendency of faulty line and non-fault line can be obviously distinguished, is conducive to improve ground connection choosing
Line accuracy rate.
3, the impedance earth transformer of the utility model puts into failure, instantaneously only when ground fault occurs for system with this
Working method can make impedance earth transformer using Miniaturization Design, reduce its volume, weight, cost and loss；
4, the utility model, when singlephase earth fault occurs for system, instantaneous conduction band impedance earth transformer both can be with
Enhance the sensitivity of route selection, and does not influence relay protection；Band impedance earth transformer switchs interoperation with phase mistake proofing is sentenced, in event
Barrier branch and normal branch form the temporal variations amount completely contradicted, even if it is accurate also to can guarantee in high resistance ground
Route selection；Restore in instantaneity ground fault system and during permanent earth fault artificial involution, band impedance earth transformation
Device is instantaneously put into, and effectively system neutral can be inhibited to shake, and protects voltage transformer and voltage transformer fuse.
Other features and advantages of the utility model will illustrate in the following description, also, partly from specification
In become apparent, or understood and implementing the utility model.The purpose of this utility model and other advantages can pass through
Pointed structure is achieved and obtained in the specification, claims and drawings.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is
Some embodiments of the utility model, for those of ordinary skill in the art, without creative efforts,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 show the utility model it is a kind of based on failure mutually through sentencing the system of the arc-extinction device of phase mistake proofing switching technique
Figure；
Fig. 2 shows the utility model it is a kind of based on failure mutually through sentencing the movement of the arc-extinction device of phase mistake proofing switching technique
Logical flow chart；
Fig. 3 show the utility model it is a kind of based on failure mutually through sentencing the extinguishing arc of the arc-extinction device of phase mistake proofing switching technique
Sofe Switch schematic diagram；
Fig. 4 shows the compensation current diagram that tradition connects electrotransfer arc-extinction device；
Fig. 5 shows the High frequency amplification figure of tradition ground connection transfer arc-extinction device compensation electric current；
Fig. 6 shows a kind of compensation electricity that the arc-extinction device of phase mistake proofing switching technique is mutually sentenced based on failure of the utility model
Flow diagram；
Fig. 7 shows a kind of compensation electricity that the arc-extinction device of phase mistake proofing switching technique is mutually sentenced based on failure of the utility model
Flow transient process enlarged drawing；
Fig. 8 shows tradition ground connection transfer arc-extinction device switch contact transfer extinguishing arc scheme and sentences the transfer of phase mistake proofing switch contact
The dash current comparison schematic diagram of extinguishing arc scheme；
Fig. 9 shows the bus three-phase voltage variation schematic diagram for sentencing phase mistake proofing switch contact extinguishing arc technology extinguishing arc recovery process；
Figure 10 shows faulty line zero-sequence current variation schematic diagram before and after the grounding transformer investment with impedance；
Figure 11 shows sound circuit zero-sequence current variation schematic diagram before and after the grounding transformer investment with impedance.
Attached drawing introduction: 1, system busbar；2, three-phase line；3, contactor；4, band impedance earth transformer；5, the first electric current
Mutual inductor；6, extinguishing arc Sofe Switch；61, failure phase earthing switch；62, ground connection mistake proofing switch；63, transition resistance；7, the second electric current
Mutual inductor；8, master controller；9, transient voltage detection unit；10, voltage transformer.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment clearly and completely illustrates the technical scheme in the embodiment of the utility model, it is clear that retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model
Example, every other embodiment obtained by those of ordinary skill in the art without making creative efforts belong to
The range of the utility model protection.
To be illustrated as lake substation as pilot, but the utility model proposes one kind be based on failure and mutually sentenced phase mistake proofing
The arc-extinction device of switching technique is applicable not only to substation, or is suitable for other distribution network systems.
This is installed based on failure at II sections mutually through sentencing the arc-extinction device of phase mistake proofing switching technique, is still tradition ground connection at I sections
The arc suppression coil device of arc-extinction device is shifted, and guarantees that arc suppression coil enters overcompensation state, utilizes data comparative analysis extinguishing arc
Coil device with should based on failure mutually through sentencing the advantage and disadvantage of the arc-extinction device of phase mistake proofing switching technique, further verifying should based on therefore
Barrier is mutually through sentencing the practicability and replicability of the arc-extinction device of phase mistake proofing switching technique；Pilot device need to meet fault-tolerant error correction,
100% option is correct, and suppressor system oscillation protects Ferroresonance Damage in Systems and zero sequence recess feature high resistant route selection that can cooperate
Distribution automation realizes the function of fault section isolation, and the testing result of the line-selected earthing device in the studies above should be able to be with
Analysis result in distribution line state on_line monitoring system is accordingly demonstrate,proved；
The a kind of of the utility model as shown in Figure 1 be mutually through sentence the arc-extinction device of phase mistake proofing switching technique based on failure
System figure, it is a kind of based on failure mutually through sentencing the arc-extinction device of phase mistake proofing switching technique, including the three-phase line drawn by system busbar 1
2, and the contactor 3, the band impedance earth transformer 4 that are sequentially connected in series between system busbar 1 and ground terminal, band impedance earth change
4 the first current transformer of lower link 5 of depressor surveys electric current, contactor 3 and with the extinguishing arc Sofe Switch 6 in parallel of impedance earth transformer 4,
6 the second current transformer of lower link 7 of extinguishing arc Sofe Switch surveys electric current, contactor 3 and extinguishing arc Sofe Switch 6 by master controller 8 into
Row control, master controller 8 access three-phase voltage signal.
The extinguishing arc Sofe Switch 6 includes three groups of failure phases earthing switch 61 corresponding with three-phase line 2 respectively and ground connection
Mistake proofing switch 62 and transition resistance 63 are constituted, be grounded after mistake proofing switch 62 and transition resistance 63 and connection and with three groups of fault grounds
Switch 61 is connected, and three groups of failure phase earthing switches 61 and ground connection mistake proofing switch 62 are controlled by master controller 8, will
Failure circuitry phase ground connection；
With transient voltage detection unit 9, the transient voltage detection unit 9 includes wideband electricity for the connection of three-phase line 2
Pressure sensor and transient voltage recording controller.
The contactor 3 is Integral three-phase vacuum contactor.
The three-phase line 2 is grounded by the secondary side of voltage transformer 10.
Fig. 2 shows the utility model it is a kind of based on failure mutually through sentencing the movement of the arc-extinction device of phase mistake proofing switching technique
Logical flow chart, the device real-time detecting system busbar voltage, when singlephase earth fault occurs for system, in order to extinguish electricity as early as possible
Arc is to avoid harm upgrading, and device controls failure phase earthing switch (K1 or K2 or K3) after transition resistance R closure in device, prison
Flow measurement crosses the electric current and dependent vector relationship of transition resistance R；After confirming that phase selection is correct, closure switch K4 connects failure phase metal
Ground；If phase selection mistake, the failure phase earthing switch being closed is opened, again phase selection and execution；It is set after delay (in advance
If the time is 5 seconds, user can modify according to practical operating experiences), Integral three-phase contactor K5 closure, investment ground connection transformation
Device after 50 milliseconds of delay, first disconnects switch K4, puts into transition resistance R, then disconnect failure phase earthing switch (K1 or K2 or K3),
And judge whether ground fault still has；It is shown to be transient single-phase earth fault if ground fault has disappeared, records thing
Part, system are restored to operate normally；Permanent singlephase earth fault is shown to be if singlephase earth fault still has, at this time due to
The fault branch that is dropped in of grounding transformer JDB flows through the apparent zero-sequence current of feature in device, to realize accurate route selection；It is complete
After route selection, continue Closing fault phase；Fault point restore or isolation after, when long-range involution or subterranean equipment, first by device
Interior Integral three-phase contactor K5 closure, puts into grounding transformer JDB, and then successively separately switch K4 is mutually switched with failure,
Integral three-phase contactor K5 is finally separated, recovery system operates normally.
As shown in figure 3, K1 is closed after controller judgement, and resistance seals in zero sequence channel when system A phase breaks down, press down
The cabinet body electric discharge of the problems such as inrush current of system processed, solution is because of ground resistance, when the electric current that control system detects is in definite value
Within, K4 continues to be closed the fault current at thoroughly transfer scene；The process of involution is just on the contrary, inhibit disjunction overvoltage.
Fig. 4 is the compensation current diagram that tradition connects electrotransfer arc-extinction device, and Fig. 5 is that tradition ground connection transfer arc-extinction device is mended
Repay the High frequency amplification figure of electric current, the electric current of fuse when switch arc suppression contact closure, leading portion is high frequent current peaks about 5000A,
Duration is about a frequency cycle, and rear end is system to earth-current about 50A.
Fig. 6 shows a kind of compensation electricity that the arc-extinction device of phase mistake proofing switching technique is mutually sentenced based on failure of the utility model
Flow diagram, Fig. 7 show the utility model it is a kind of based on failure mutually through sentencing the compensation of the arc-extinction device of phase mistake proofing switching technique
Current temporary state procedure enlarged drawing；The electric current of fuse, high frequency are flowed through when originally sentencing phase mistake proofing switch contact extinguishing arc technology contact closure
Current peak about 1000A, and the duration is very short；Sentencing the electric current after phase mistake proofing closes the switch is system capacitive earth current
50A。
Compare in conjunction with the extinguishing arc high-frequency current of two kinds of contact transfer current in the fault point technologies, as shown in Figure 8: dotted line is to pass
The emulation dash current of system ground connection transfer arc-extinction device switch contact transfer extinguishing arc scheme, black solid line is to sentence phase mistake proofing switch contact
The emulation dash current of extinguishing arc scheme is shifted, impact amplitude is sentenced phase mistake proofing switch contact in terms of 5:1 or so, attack time and turned
It moves extinguishing arc scheme and is substantially better than switch contact transfer extinguishing arc scheme.
Sentence the size that phase mistake proofing switch contact extinguishing arc technology flows through transition resistance R electric current by judgement, whether differentiates phase selection
Correctly；If the electric current by transition resistance R is greater than system capacitive earth current, then it is assumed that phase selection mistake is turned on the switch, selected again
Phase；If the electric current by transition resistance R is less than system capacitive earth current, then it is assumed that phase selection is correct, is closed by-pass switch, is shorted
Transition resistance R.
The bus three-phase voltage for sentencing phase mistake proofing switch contact extinguishing arc technology extinguishing arc recovery process as shown in Figure 9；It is provisional
After ground fault is eliminated (faulted phase voltage rise), sentences the 100 milliseconds of opening main contacts that are delayed after phase mistake proofing switch contact is opened, be
System restores normal.
It should be noted that for isolated neutral system, by put into neutral ground pulse grounding transformer,
It is equivalent to neutral point and puts into an impedance, Lai Zeng great flows through the zero-sequence current of single-phase earthing feeder line upstream, realizes accurate route selection.
After permanent singlephase earth fault occurs for confirmation, the grounding transformer with impedance is put into, it is each by comparing
The variation ratio of line outlet side zero-sequence current, can effectively identify faulty line；
After grounding transformer investment with impedance, failure phase line zero-sequence current becomes neutral ground electric current due to ground connection
Inflow and increase；Perfect phase line zero-sequence current and balances zero sequence electricity due to changing system zero sequence impedance, route three-phase voltage
Drops and reduce.
Figure 10 is that sound circuit is grounded the change for becoming electric current before and after transformer neutral point is grounded when high resistance earthing fault occurs
Change, Figure 11 is the variation of faulty line electric current before and after grounding transformer neutral ground, becomes neutral in ground connection with faulty line
The variation of point ground connection front and back electric current.
The zero-sequence current variation before and after the grounding transformer investment with impedance of comparison discovery, faulty line and sound circuit becomes
Gesture is on the contrary, can be used as route selection criterion with this.
On the basis of to existing small current line selection technology and neutral grounding mode numerous studies, propose it is completely new,
It is totally different from the mutation current variant projects of location of small current line selection principle；Theory analysis, emulation and simulated experiment can verify this
Variant projects of location has high route selection accuracy, can fundamentally solve the single-phase earthing event of system with non effectively earth ed neutral
Hinder route selection problem.
Although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art are answered
Work as understanding: it is still possible to modify the technical solutions described in the foregoing embodiments, or special to part of technology
Sign is equivalently replaced；And these are modified or replaceed, each reality of the utility model that it does not separate the essence of the corresponding technical solution
Apply the spirit and scope of a technical solution.
Claims (7)
1. it is a kind of based on failure mutually through sentencing the arc-extinction device of phase mistake proofing switching technique, including system busbar (1) draw triple line
Road (2), which is characterized in that
Including contactor (3), band impedance earth transformer (4) being sequentially connected in series between system busbar (1) and ground terminal, band resistance
Anti- grounding transformer (4) the first current transformer of lower link (5)；
Contactor (3) and with impedance earth transformer (4) extinguishing arc Sofe Switch (6) in parallel, the second electricity of extinguishing arc Sofe Switch (6) lower link
Current transformer (7)；
Contactor (3) and extinguishing arc Sofe Switch (6) are controlled by master controller (8), and master controller (8) accesses three-phase voltage
Signal.
2. it is according to claim 1 it is a kind of based on failure mutually through sentencing the arc-extinction device of phase mistake proofing switching technique, feature exists
In the extinguishing arc Sofe Switch (6) includes three groups of failure phases earthing switch (61) corresponding with three-phase line (2) respectively and ground connection
Mistake proofing switchs (62) and transition resistance (63) is constituted；
It connects after ground connection mistake proofing switch (62) and transition resistance (63) and connection and with three groups of failure phase earthing switches (61),
Three groups of failure phase earthing switches (61) and ground connection mistake proofing switch (62) are controlled by master controller (8), and failure is mutually electric
Road ground connection.
3. it is according to claim 1 it is a kind of based on failure mutually through sentencing the arc-extinction device of phase mistake proofing switching technique, feature exists
In three-phase line (2) connection is with transient voltage detection unit (9).
4. it is according to claim 3 it is a kind of based on failure mutually through sentencing the arc-extinction device of phase mistake proofing switching technique, feature exists
In the transient voltage detection unit (9) includes wideband voltage sensor and transient voltage recording controller.
5. it is according to claim 1 it is a kind of based on failure mutually through sentencing the arc-extinction device of phase mistake proofing switching technique, feature exists
In the contactor (3) is vacuum contactor.
6. it is according to claim 5 it is a kind of based on failure mutually through sentencing the arc-extinction device of phase mistake proofing switching technique, feature exists
In the contactor (3) is Integral three-phase contactor.
7. it is according to claim 1 it is a kind of based on failure mutually through sentencing the arc-extinction device of phase mistake proofing switching technique, feature exists
In the three-phase line (2) is grounded by the secondary side of voltage transformer (10).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112886562A (en) * | 2021-03-30 | 2021-06-01 | 河北旭辉电气股份有限公司 | Transfer resistance adjustable active intervention arc extinction device and application |
| WO2021169643A1 (en) * | 2020-02-26 | 2021-09-02 | 安徽一天电气技术股份有限公司 | Arc extinction system and method |
| WO2023087430A1 (en) * | 2021-11-19 | 2023-05-25 | 广东福德电子有限公司 | Power grid single phase-to-ground fault simulation load device |
-
2019
- 2019-01-14 CN CN201920053529.8U patent/CN209709686U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021169643A1 (en) * | 2020-02-26 | 2021-09-02 | 安徽一天电气技术股份有限公司 | Arc extinction system and method |
| CN114026762A (en) * | 2020-02-26 | 2022-02-08 | 安徽一天电气技术股份有限公司 | Arc suppression system and method |
| CN112886562A (en) * | 2021-03-30 | 2021-06-01 | 河北旭辉电气股份有限公司 | Transfer resistance adjustable active intervention arc extinction device and application |
| WO2023087430A1 (en) * | 2021-11-19 | 2023-05-25 | 广东福德电子有限公司 | Power grid single phase-to-ground fault simulation load device |
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