CN102270835A - Distributed over-current protection and interphase fault isolation method for distribution network - Google Patents
Distributed over-current protection and interphase fault isolation method for distribution network Download PDFInfo
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- CN102270835A CN102270835A CN2011102105521A CN201110210552A CN102270835A CN 102270835 A CN102270835 A CN 102270835A CN 2011102105521 A CN2011102105521 A CN 2011102105521A CN 201110210552 A CN201110210552 A CN 201110210552A CN 102270835 A CN102270835 A CN 102270835A
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Abstract
The invention discloses a distributed over-current protection and interphase fault isolation method for a distribution network. An intelligent device which is arranged at a distribution switch monitors current passing through the distribution switch and judges whether the current is over-current; when the intelligent device detects the over-current, a communication network immediately collects information that whether all intelligent devices adjacent to the distribution at the downstream detect the over-current, that whether an interphase fault occurs on an adjacent distribution line of the distribution switch at the downstream is judged according to the collected current information; and if the fault occurs on the adjacent distribution line of the distribution switch at the downstream, the distribution switch is switched off. The method solves the problems of reliability caused by nonselective trip and difficulty of time limit coordination of the distribution network.
Description
Technical field
The present invention relates to relaying protection field and power distribution automation field, specifically is the method for isolating phase-to phase fault in overcurrent protection method when phase fault takes place in 10～35kV medium voltage distribution network and the power distribution automation.
Background technology
The phase fault of 10～35kV medium voltage distribution network (hereinafter to be referred as power distribution network) comprises three-phase shortcircuit, line to line fault and line to line fault ground connection.During power distribution network generation phase fault, the overcurrent of generation will be above current setting.But because distribution line is shorter, distribution load distributes along distribution line, and distribution line is along the line by a plurality of panel switches segmentations, so power distribution network overcurrent protection shortage selectivity, and overstep tripping often takes place, and causes the power failure expanded range.
The phase fault of power distribution network belongs to most common failure, and the method for isolating the power distribution network phase fault at present mainly contains following several:
(1) adopt the isolated fault that cooperatively interacts of the Fault Isolation function of transformer station's overcurrent protection and power distribution automation: promptly adopt the power distribution network of the overcurrent protection quick-break action excision guilty culprit that is installed in transformer station earlier, the Fault Isolation function that adopts power distribution automation again with Fault Isolation between two nearest panel switches of distance fault point.
Radial distribution networks as shown in accompanying drawing 4, transformer station goes out the protection of wiretap A place installing instantaneous over-current, panel switches B, C, D, E, F place installing distribution power automation terminal equipment FTU.When CD circuit generation phase fault, at first transformer station has wiretap A instantaneous over-current tripping operation excision fault; Electrical power distribution automatization system is collected the fault current information of each FTU then, calculates by Fault Isolation, adopts remote control thereof panel switches C to be disconnected isolated fault.As seen, use this method can at first cause the whole piece feeder line to have a power failure, on the whole piece feeder line, seek then produce fault the place, after isolated fault, could recover the power supply of other node, this method has enlarged the power failure scope.
(2) the ladder time limit fitting method isolated fault of employing overcurrent protection: i.e. the operation time limit of upper level overcurrent protection is than the long Δ t of the operation time limit of next stage overcurrent protection; adopt earlier overcurrent protection action excision fault, the Fault Isolation function that adopts power distribution automation again with Fault Isolation between two nearest panel switches of distance fault point.The problem that this method exists is: because distribution protection progression is a lot, often can't satisfy the requirement of the 0.3～0.5s of transformer station time-delay fast tripping protection allowed band.Radial distribution networks as shown in accompanying drawing 4; if Δ t=0.15s (satisfying the requirement of bullet behaviour switch); Δ tF=0s then; Δ tE=0.15s; Δ tC=0.3s; Δ tB=0.45s; Δ tA=0.6s; therefore; the overcurrent protection at a plurality of panel switches place need be adjusted into identical operation time limit (Δ tF=0s; Δ tE=0s; Δ tC=0.15s; Δ tB=0.15s; Δ tA=0.3s); or some panel switches place does not install overcurrent protection and (does not install as the F place; Δ tE=0.15s; C does not install at the place; Δ tB=0.15s; Δ tA=0.3s); feasible protection loses selectivity, therefore needs the Fault Isolation function of power distribution automation to be used.In addition, to the power distribution network of labyrinth, the power distribution network as shown in accompanying drawing 6,7 because the power distribution network operational mode is a lot, often can't adopt ladder time setting method to guarantee selectivity.On the other hand, because the power distribution network transformation is frequent, calculating/more new capital has difficulties the protection definite value.
(3) utilize voltage-time type switching characteristic isolated fault point: adopt FTU aanalogvoltage-time type switching characteristic, utilize the isolated fault that cooperatively interacts of each panel switches switching characteristic.Referring to accompanying drawing 4, if permanent fault occurs in the CD circuit, panel switches A is tripping operation earlier, panel switches B, C, the tripping operation of D decompression; Panel switches A overlaps, and panel switches B detects the voltage closure then, and panel switches C detects the voltage closure then, but when panel switches C was closed, fault occurred again, and panel switches A trips again, the tripping operation of panel switches B decompression, panel switches C decompression tripping operation locking; Panel switches A overlaps again, and panel switches B detects the voltage closure then.As seen, the problem that this method exists is: need in the process of fault isolation to divide closing operation through multiple switching, the Fault Isolation time is long, and not only the user is caused to have a power failure and impact, and also very big to the switch life influence.
Summary of the invention
The objective of the invention is the problem that exists in overcurrent protection of present 10～35kV medium voltage distribution network and the phase fault partition method, the method that provides alternate overcurrent protection of a kind of power distribution network and phase fault to isolate, this method is during as the alternate overcurrent protection of power distribution network, makes the alternate overcurrent protection of power distribution network need not the time limit and cooperates and just can realize that selectivity trips; When this method is isolated as phase fault, can isolate the power distribution network phase fault, be suitable for the power distribution network of various open loop operations with minimum switch deciliter number of operations.
Realize that the technical scheme that the object of the invention adopts is:
Distributed overcurrent protection method of a kind of power distribution network and distributed phase-to phase fault partition method may further comprise the steps:
Be installed in the electric current of the intelligent apparatus monitoring at panel switches place, and judge whether this electric current is overcurrent by panel switches;
If intelligent apparatus detects overcurrent, then whether the intelligent apparatus of collecting its all contiguous panel switches places, downstreams by communication network immediately detects overcurrent, and according to collecting to such an extent that overcurrent information judges whether phase fault occurs in described panel switches downstream and be close on the distribution line;
If fault occurs on the contiguous distribution line in described panel switches downstream, then disconnect described panel switches.
Described distributed method is meant in the power distribution network that all intelligent apparatus that are installed in the panel switches place all carry out above-mentioned identical algorithm, and the existence that does not rely on main website whether.
Described intelligent apparatus is meant, when the overcurrent protective device of this algorithm during as distributed overcurrent protection algorithm, the controller in the intelligent primary equipment (intelligent on-pole switch, intelligent switchboard); Perhaps when the distribution power automation terminal device (as FTU, DRTU etc.) of this algorithm when the distributed fault isolated algorithm, the controller in the intelligent primary equipment (intelligent on-pole switch, intelligent switchboard).
Described intelligent apparatus monitoring judges that the method for overcurrent is: monitoring is by the three-phase current of switch, and its arbitrary phase current judges promptly that greater than setting current this electric current is an overcurrent.
The described method of judging whether phase fault occurs on the contiguous distribution line in described panel switches downstream is: if described panel switches place detects overcurrent, but its downstream is closed on the panel switches place and is not detected overcurrent, and then phase fault occurs on the contiguous distribution line in described panel switches downstream; If described panel switches place detects overcurrent, but do not have the downstream proximity switch, then phase fault occurs on the contiguous distribution line in described panel switches downstream; If described panel switches place and downstream thereof are closed on the panel switches place and all detected overcurrent, then phase fault is not to occur on the contiguous distribution line in described panel switches downstream.
The method of the described panel switches of described disconnection is: if panel switches are circuit breaker, then directly disconnect described panel switches; If panel switches are sectionalizer or on-load switch, then disconnect higher level's circuit breaker of described panel switches earlier, disconnect described panel switches again, at last with higher level's breaker closing of described panel switches.
Adopt the protection and the failure separation method of the present invention program's power distribution network phase fault, have these remarkable advantages and beneficial effect:
1, than existing method, the inventive method can make the overcurrent protection of phase fault need not the time limit cooperation just can realize the selectivity action, has solved the problem of power distribution network time limit cooperation difficulty, has solved the integrity problem that present non-selective tripping operation brings.
2, owing to need not the time limit cooperation, only need the overcurrent definite value of adjusting, reduced the time limit maintenance workload of wasting time and energy and makeing mistakes easily;
3, than existing method, the inventive method is isolated phase fault with minimum switching manipulation number of times, has avoided the multiple switching in the process of fault isolation to divide closing operation, causes the impact that has a power failure little to the user, has reduced the switch influence in useful life;
4, the inventive method need not to utilize the feeder automation main website, and communication failure only influences the circuit part, has improved power supply reliability greatly;
5, the inventive method has been reduced to the circuit part with the influence of information dropout or information errors, has improved power supply reliability;
6, the frequent power distribution network rebuilding and expansion of the of the existing enterprises had maximum adaptability.When the power distribution network rebuilding and expansion of the of the existing enterprises, only need intelligent apparatus to relevant on-pole switch and switch cubicle simply to be provided with and get final product.
Description of drawings
Fig. 1 is the schematic diagram that the inventive method is used in electrical network.
Fig. 2 is a principle of the invention explanation schematic diagram.
Fig. 3 the inventive method flow chart.
Fig. 4 is the radial distribution networks schematic diagram of band branch.
Fig. 5 is the power distribution network schematic diagram of handing in hand.
Fig. 6 is the multi-joint network power distribution network schematic diagram of handing in hand.
Fig. 7 is a complex web trellis power distribution network schematic diagram.
Among the figure, the roundlet that the black on the power distribution network is filled is represented normally closed panel switches; The roundlet that white is filled represents often to open panel switches.
Embodiment
Below in conjunction with the drawings and specific embodiments technical solution of the present invention is described further.
Referring to accompanying drawing 1, specific embodiments of the invention are passed through at panel switches A, B, C and D, and panel switches cabinet E and F place installing intelligent apparatus 1 are realized, adopt IA High Speed Channel 2 to connect between each intelligent apparatus 1.In the present embodiment, intelligent apparatus 1 is the protection control device of intelligent power distribution switch, the FTU device of panel switches place installing, the protection control device of intelligent power distribution switch cubicle, the DTU of panel switches cabinet place installing etc.All contiguous panel switches or panel switches intelligent apparatus cashier's office in a shop can intercom mutually, and communication mode can be a typical distribution formula P2P mode, also can be the client-server mode.Communication protocol is followed IEC870-5-101, IEC870-5-104, DNP, IEC61850 standards such as (GB DL/Z 860).Communication channel adopts optical fiber, twisted-pair feeder or wireless private network IA High Speed Channel commonly used such as (as WiMax), and IA High Speed Channel will increase the rapidity of protection action and Fault Isolation.
The present invention realizes the judgement of phase-to phase fault according to following principle: when power distribution network generation phase fault, the fault phase current will be much larger than rated current, overcurrent promptly appears, this overcurrent can be monitored by intelligent apparatus, and by judging whether that surpassing current setting determines whether to produce overcurrent: I＞I
SetBecause
Characterized the size of fault power, therefore, overcurrent can characterize the principal character of fault power.According to the power conservation principle, if fault power flows into certain element and flows out from this element, then must there be the fault point in this element; Do not flow out from this element if fault power flows into certain element, then this element certainly exists the fault point, because fault power has flowed into the fault point.
Be elaborated with electrical network shown in Figure 2 principle below to the inventive method.
If fault occurs in f
1Point, then only flow through panel switches A, B of fault power.For distribution line AB, fault power flows into distribution line and flows out distribution line from B from A, so distribution line AB fault-free.For distribution line BC and BD, fault power flows into distribution line from B, but does not flow out distribution line from C, D any point, so distribution line BC or BD fault.
If fault occurs in f
2Point, then flow through panel switches A, B, D, E of fault power
1For distribution line DE, fault power is from D inflow distribution line and from E
1Flow out distribution line, so distribution line DE fault-free.For distribution line EF, fault power flows into distribution line from E1, but not from F
1Flow out distribution line, so fault occurs in E
1F
1Between.For panel switches cabinet E, fault power is from E
1Flow into the panel switches cabinet, but not from E
2, E
3The panel switches cabinet is flowed out in any point, and therefore, fault occurs in panel switches cabinet inside.
If fault occurs in f
3Point, for distribution line EF, fault power flows into distribution line from E1, but not from F
1Flow out distribution line, so fault occurs in E
1F
1Between.For panel switches cabinet E, fault power is from E
1Flow into the panel switches cabinet, from E
3Point outflow panel switches cabinet, therefore, fault occurs in panel switches cabinet outside, promptly on the EF circuit.
In sum, as long as have phase fault in the power distribution network, must have at least an intelligent apparatus to monitor overcurrent, all intelligent apparatus that detect overcurrent all will start the inventive method, until Fault Isolation is arrived between two panel switches nearest apart from the fault point.The present invention isolates the method for phase fault automatically shown in the flow chart of accompanying drawing 3, and concrete steps comprise:
(1) intelligent apparatus i monitors the electric current that panel switches k (or panel switches cabinet k) locate, and judges whether this electric current surpasses current setting.If have any phase current to surpass current setting in the three-phase current, overcurrent promptly occurs, then execution in step (2); Otherwise repeat this step.
(2) intelligent apparatus i inquires about the protective device of locating with all downstream panel switches (or panel switches cabinet) of panel switches k (or panel switches cabinet k) vicinity immediately and whether monitors overcurrent.Perhaps, intelligent apparatus i notifies information " intelligent apparatus i monitors overcurrent " protective device that all contiguous downstream panel switches (or panel switches cabinet) of panel switches k (or panel switches cabinet k) are located immediately.
(3) if intelligent apparatus i has inquired about and has finished, or setting time arrives, intelligent apparatus i carries out the fault point and judges: if the protective device that all contiguous downstream panel switches (or panel switches cabinet) are located does not all monitor overcurrent, reply panel switches k (or panel switches cabinet k) control disengagement failure, then to panel switches k execution in step (4), to panel switches cabinet k, execution in step (5); Otherwise, if the intelligent apparatus i that has any contiguous downstream panel switches m (or panel switches cabinet m) to locate monitors overcurrent, then phase-to phase fault occurs in the downstream of panel switches m (or panel switches cabinet m service entrance switch), panel switches k (or panel switches cabinet k) is not carried out any control, continue the monitoring overcurrent up to its back execution in step (1) that disappears.
(4) if panel switches k is a circuit breaker, then directly disconnect panel switches k; If panel switches k is sectionalizer or on-load switch, then notify higher level's breaker open operation of panel switches k earlier, disconnect panel switches k again, notify higher level's breaker closing of panel switches k at last.Execution in step (1).
(5) whether intelligent apparatus i detection failure occurs in the inside of panel switches cabinet k, and all that promptly judge panel switches cabinet k go out wiretap does not all have overcurrent.If fault occurs in the inside of panel switches cabinet k, then disconnect the lead-in circuit breaker of panel switches cabinet k.If fault occurs in the outside of panel switches cabinet k, a certain the outlet switch n overcurrent of promptly joining switch cubicle k then should disconnect this outlet switch n.If the outlet switch n is a circuit breaker, then directly disconnect the outlet switch n; If the outlet switch n is sectionalizer or on-load switch, then disconnect the service entrance switch of panel switches cabinet k earlier, disconnect the outlet switch n again, notify the service entrance switch of the panel switches cabinet k that closes at last.Execution in step (1).
Below in conjunction with accompanying drawing 4～7, specify the inventive method.
Radial distribution networks referring to the branch of band shown in the accompanying drawing 4, if CD circuit generation phase fault, panel switches A, B, C monitor overcurrent, panel switches D, E, F do not monitor overcurrent, panel switches A inquires panel switches B and monitors overcurrent, so failure judgement is not at the AB circuit; Panel switches B inquires panel switches C and monitors overcurrent, so failure judgement is not at the BC circuit; Panel switches C inquires panel switches D and does not monitor overcurrent, so failure judgement disconnects panel switches C isolated fault on the CD circuit.If BC circuit generation phase fault, panel switches A, B monitor overcurrent, and panel switches C, D, E, F do not monitor overcurrent, and panel switches A inquires panel switches B and monitors overcurrent, so failure judgement is not at the AB circuit; Panel switches B inquires panel switches C, E and does not monitor overcurrent, thus failure judgement on the BC circuit or fault occur on the BE circuit, disconnect panel switches B isolated fault.
Shown in accompanying drawing 5, the present invention is applied to power distribution network hand in hand.If AB circuit generation phase fault, panel switches A monitors overcurrent, and panel switches A inquires panel switches B and do not monitor overcurrent, so failure judgement occurs in the AB circuit, disconnection panel switches A, isolated fault.If BC circuit generation phase fault, panel switches A, B monitor overcurrent, and panel switches A inquires panel switches B and monitors overcurrent, so failure judgement is not at the AB circuit; Panel switches B inquires panel switches C and does not monitor overcurrent, so failure judgement occurs in the BC circuit, disconnection panel switches B isolated fault.If CD circuit generation phase fault, panel switches E, D monitor overcurrent, and panel switches E inquires panel switches D and monitors overcurrent, so failure judgement is not at the DE circuit; Panel switches D inquires panel switches C and does not monitor overcurrent, so failure judgement occurs in the CD circuit, disconnection panel switches D isolated fault.If DE circuit generation phase fault, panel switches E monitors overcurrent, and panel switches E inquires panel switches D and do not monitor overcurrent, so failure judgement occurs in the DE circuit, disconnection panel switches E, isolated fault.
Embodiment 3
Shown in accompanying drawing 6, the present invention selects the multi-joint network power distribution network of handing in hand for use.If HI circuit generation phase fault, panel switches I, J monitor overcurrent, and panel switches J inquires panel switches I and monitors overcurrent, so failure judgement is not at the IJ circuit; Panel switches I inquires panel switches H, K and does not monitor overcurrent, so failure judgement occurs in HI circuit or KI circuit, disconnection panel switches I, notice panel switches H, K disconnection, isolated fault.
Embodiment 4
Shown in accompanying drawing 7, the present invention selects complex web trellis power distribution network for use.If AB circuit generation phase fault, panel switches A monitors overcurrent, and panel switches A inquires panel switches B, E and do not monitor overcurrent, therefore failure judgement occurs in AB circuit or AE circuit, disconnect panel switches A, notice panel switches B, E disconnect isolated fault.If BC circuit generation phase fault, panel switches A monitors overcurrent, and panel switches A inquires panel switches B and monitors overcurrent, so failure judgement is not at the AB circuit; Panel switches B monitors overcurrent, and panel switches B inquires panel switches C, J and do not monitor overcurrent, so failure judgement occurs in BC circuit or BJ circuit, disconnection panel switches B, notice panel switches C, J disconnection, isolated fault.
Claims (5)
1. distributed overcurrent protection of power distribution network and the phase-to phase fault method of isolating is characterized in that, may further comprise the steps:
Be installed in the electric current of the intelligent apparatus monitoring at panel switches place, and judge whether this electric current is overcurrent by panel switches;
If intelligent apparatus detects overcurrent, then whether the intelligent apparatus of collecting its all contiguous panel switches places, downstreams by communication network immediately detects overcurrent, and judges according to the overcurrent information of collecting whether phase fault occurs in described panel switches downstream and be close on the distribution line;
If fault occurs on the contiguous distribution line in described panel switches downstream, then disconnect described panel switches.
2. the method for isolating according to the distributed overcurrent protection of the described power distribution network of claim 1 and phase-to phase fault, it is characterized in that: all intelligent apparatus that are installed in the panel switches place are all carried out above-mentioned identical method in the power distribution network, described intelligent apparatus is meant, when the overcurrent protective device of this method during as distributed overcurrent protection algorithm, the controller in the intelligent primary equipment; Perhaps when the distribution power automation terminal device of this method when the distributed fault isolated algorithm, the controller in the intelligent primary equipment.
3. the method for isolating according to the distributed overcurrent protection of the described power distribution network of claim 1 and phase-to phase fault; it is characterized in that: described intelligent apparatus monitoring judges that the method for overcurrent is the three-phase current of monitoring by switch; its arbitrary phase current judges promptly that greater than setting current this electric current is an overcurrent.
4. the method for isolating according to the distributed overcurrent protection of the described power distribution network of claim 1 and phase-to phase fault, it is characterized in that, the described method of judging whether phase fault occurs on the contiguous distribution line in described panel switches downstream is: if described panel switches place monitors overcurrent, but its downstream is closed on the panel switches place and is not detected overcurrent, and then phase fault occurs on the contiguous distribution line in described panel switches downstream; If described panel switches place detects overcurrent, but do not have the downstream proximity switches, then phase fault occurs on the contiguous distribution line in described panel switches downstream; If described panel switches place and downstream thereof are closed on the panel switches place and all detected overcurrent, then phase fault is not to occur on the contiguous distribution line in described panel switches downstream.
5. according to the method for distributed overcurrent protection of the described power distribution network of claim 1 and phase-to phase fault isolation, it is characterized in that the method that disconnects described panel switches is: if described panel switches circuit breaker then directly disconnects described panel switches; If described panel switches sectionalizer or on-load switch then disconnect earlier higher level's circuit breaker of described panel switches, disconnect described panel switches again, at last with higher level's breaker closing of described panel switches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102105521A CN102270835A (en) | 2011-01-30 | 2011-07-26 | Distributed over-current protection and interphase fault isolation method for distribution network |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100325974A CN102104246A (en) | 2011-01-30 | 2011-01-30 | Method and device for reducing time limit combination step progression of distribution network relaying protection |
| CN201110032597.4 | 2011-01-30 | ||
| CN2011102105521A CN102270835A (en) | 2011-01-30 | 2011-07-26 | Distributed over-current protection and interphase fault isolation method for distribution network |
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| CN2011100325974A Pending CN102104246A (en) | 2011-01-30 | 2011-01-30 | Method and device for reducing time limit combination step progression of distribution network relaying protection |
| CN2011102105540A Pending CN102270833A (en) | 2011-01-30 | 2011-07-26 | Method and device for reducing number of relay protection time limit fit staircases in distribution network |
| CN201110210591.1A Active CN102270836B (en) | 2011-01-30 | 2011-07-26 | Wide-area over-current protection method and system for power distribution network |
| CN2011102105521A Pending CN102270835A (en) | 2011-01-30 | 2011-07-26 | Distributed over-current protection and interphase fault isolation method for distribution network |
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| CN2011100325974A Pending CN102104246A (en) | 2011-01-30 | 2011-01-30 | Method and device for reducing time limit combination step progression of distribution network relaying protection |
| CN2011102105540A Pending CN102270833A (en) | 2011-01-30 | 2011-07-26 | Method and device for reducing number of relay protection time limit fit staircases in distribution network |
| CN201110210591.1A Active CN102270836B (en) | 2011-01-30 | 2011-07-26 | Wide-area over-current protection method and system for power distribution network |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN102270836A (en) | 2011-12-07 |
| CN102270836B (en) | 2014-07-09 |
| CN102104246A (en) | 2011-06-22 |
| CN102270833A (en) | 2011-12-07 |
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