CN104201657A - Power direction judgment based bidirectional blocking protection method for distributing line - Google Patents
Power direction judgment based bidirectional blocking protection method for distributing line Download PDFInfo
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- CN104201657A CN104201657A CN201410445203.1A CN201410445203A CN104201657A CN 104201657 A CN104201657 A CN 104201657A CN 201410445203 A CN201410445203 A CN 201410445203A CN 104201657 A CN104201657 A CN 104201657A
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- overcurrent
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Abstract
The invention discloses a power direction judgment based bidirectional blocking protection method for a distributing line. According to the power direction judgment based bidirectional blocking protection method for the distributing line, information interchange between FTUs (Feeder Terminal Unit) is achieved through the network communication technology, exchange of action information between superior and subordinate protection is achieved, interlocking is achieved, short-circuit fault bidirectional blocking type protection is achieved, action time delay caused by multilevel cooperation is effectively shortened, quick fault isolation is achieved, and fault hazards are reduced. The current situation that most generator circuit breakers do not participate in blocking in site is fully taken into consideration, the fault can be accurately positioned and isolated during power failure transferring and network topological changes, a primary station is not required to participate in the integral protection process, and the workload of the primary station is reduced. The power direction judgment based bidirectional blocking protection method for the distributing line is particularly suitable for line protection of a closed-loop designed and open-loop operated power distribution network with the primary station being not involved in controlling and the generator circuit breaker being not involved in blocking.
Description
Technical field
The invention belongs to electric power system distribution line relaying protection field, relate in particular to a kind of two-way latch-up protection method of distribution line based on power direction judgement.
Background technology
In recent years, development and maturation along with wide area synchro measure and Automation Technology of Digitized Transformer, provide opportunity for fundamentally improving and improve the performance of relaying protection.Therefore, examine the problem that traditional relay protection exists under complex electric network environment closely, research can be identified the relaying protection new method with isolated fault fast, is the important content that ensures the stable operation of electrical network.And also there are many problems in existing wide area measurement relay protecting method, for example, reckon without under current administration of power networks system, most of outlet breakers are not included in distribution network automated, do not participate in block signal sending and receiving; Moreover existing latch-up protection method, needs the participation of main website more; Meanwhile, most power distribution network closed loop design, open loop operation, and existing latch-up protection reckon without power distribution network occur to have a power failure turn for after, the problem that network topology structure changes.
" the quick protection philosophy of distribution line and analysis " (Xiao Yong etc.; University Of Chongqing's journal (natural science edition), 2004:27 (11): 31-33) mentioned two kinds of guard methods: two-way enclosed type overcurrent protection and two-way permission formula overcurrent protection.Wherein, two-way permission formula overcurrent protection is divided into again the two-way permission formula overcurrent protection of the failure judgement sense of current and the non-failure judgement sense of current.The operation principle of two-way enclosed type overcurrent protection method is: the Judging fault sense of current; experience overcurrent FTU to fault current positive direction (fault current outflow) side transmitted signal not; only to fault current (fault current inflows) side transmission in the other direction block signal, FTU is only to the FTU transmitted signal of its adjacent side.The principle of the two-way permission formula overcurrent protection method of the failure judgement sense of current is: differentiate the sense of current; FTU flows out direction to fault current and sends out permission signal; for fault current inflow direction, do not signal, same FTU is only to the FTU transmitted signal of its adjacent side.Two kinds of guard methods all need the Judging fault sense of current, and all do not consider that on-the-spot outlet breaker does not participate in the actual conditions of locking, are not suitable for on-the-spot application.The two-way permission formula overcurrent protection method of the Judging fault sense of current is not differentiated the sense of current; FTU experiences backward its adjacent both sides of overcurrent and sends out permission signal; require outlet breaker to participate in allowing the transmission of signal, can not adapt to on-the-spot outlet breaker and not participate in the situation that signal sends or receives.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of two-way latch-up protection method of distribution line based on power direction judgement; to meet, main website does not participate in controlling and outlet breaker does not participate in locking, especially the route protection demand of closed loop design, open loop operation (existing has a power failure turns confession) power distribution network.
For solving the problems of the technologies described above, the present invention by the following technical solutions: the two-way latch-up protection method of distribution line based on power direction judgement, definition FTU is border FTU and middle FTU, FTU is after experiencing overcurrent, the FTU of Xiang Qi the superior and the subordinate sends block signal; For border FTU, except whether experiencing overcurrent, overcurrent direction according to it, and T at the appointed time
1inside whether receive or receive the block signal of one or both sides, control respective circuit breakers action or locking; For middle FTU, according to it, whether experience overcurrent, and T at the appointed time
1inside whether receive or receive the block signal of one or both sides, control respective circuit breakers action or locking; If T after fault
2(T
2>T
1) time, still there is overcurrent, outlet breaker action, realizes the protection of fault between border FTU and wire-outgoing breaker.
Specifically by following operation, undertaken:
1, FTU is divided into border FTU and middle FTU.
For the duplicate supply distribution network of closed loop design, open loop operation, the next FTU of definition power outlet circuit breaker is border FTU, and all the other whole FTU are middle FTU.
2, relaying protection operating current setting value I is set
set.
1) if sample rate current value I<I
set, show to occur without overcurrent;
2) if sample rate current value surpasses I>I
set, show to have overcurrent to occur.
3, at FTU, experience after overcurrent the overcurrent direction that judgement is monitored.
It is electric current positive direction that definition is pointed to circuit by power supply, if the sense of current monitoring is consistent with positive direction, for just; Otherwise, for negative.
4, at FTU, experience after overcurrent, to its adjacent FTU of the superior and the subordinate, send out block signal immediately, and start timing, work as t=T
1time, whether statistics FTU receives and receives whether the block signal decision-making of a side or both sides moves.
1) for border FTU,
If 1. experience overcurrent, and judge that the sense of current is for just, and can not receive block signal, respective circuit breakers action.
If 2. experience overcurrent, and judge that the sense of current is negative, respective circuit breakers action.
Otherwise respective circuit breakers is failure to actuate.
2) for middle FTU, experience overcurrent, and only receive a side block signal or do not receive block signal, respective circuit breakers action; Otherwise respective circuit breakers is failure to actuate.
5, T after fault
2(T
2>T
1) time, i.e. t=T
2time, if still there is overcurrent in circuit, outlet breaker action, realizes the protection of fault between border FTU and wire-outgoing breaker.
For closed loop design, open loop operation (existing has a power failure turns confession) and main website, do not participate in controlling; outlet breaker does not participate in the distribution line of locking; inventor has set up a kind of two-way latch-up protection method of distribution line based on power direction judgement; utilize the network communications technology to realize the information exchange between FTU; complete the exchange of action message between the protection of adjacent the superior and the subordinate; and realization interlocking; thereby realize the two-way blocking protection of short trouble; effectively shorten the action delay that cascaded coordination brings; realize fault and isolate fast, reduce fault harm.This method is divided into border FTU and middle FTU by FTU, and except the border FTU palpus Judging fault sense of current, middle FTU is without the Judging fault sense of current; Experience overcurrent FTU and to its adjacent both sides FTU, all send block signal simultaneously; border and middle FTU control locking or the action of respective circuit breakers according to criterion separately; and backup protection is set, be effectively applicable to the actual conditions that on-the-spot outlet breaker does not participate in locking.The present invention has fully taken into account the present situation that on-the-spot most of outlet breaker does not participate in locking, in power failure, turns confession, during network topology change, still can accurately locate, isolated fault, and whole protection process, without the participation of main website, reduces the workload of main website.
Accompanying drawing explanation
Fig. 1 is distribution network system structure chart.
Fig. 2 is the structural representation of power distribution network power distribution automation.
Fig. 3 is a-power supply power supply area under power distribution network LB off-state (a-power supply is out of service, and region 1,2,3,4 turns confession by B-source).
Fig. 4 is that region 1,2,3,4 is turned the line assumption diagram of confession by B-source.
Fig. 5 is that region 3,4 is turned the line assumption diagram of confession by B-source.
Embodiment
Embodiment
1. line facility configuration
The general power distribution network of link is hand in hand all closed loop design, open loop operation, and system configuration is as shown in Figure 1.By A, B two Power supplies, each circuit breaker is installed corresponding FTU, wherein, and QF
1, QF
7for outlet breaker, outlet protection equipment does not participate in reception or the transmission of block signal, and corresponding outlet protection is CB1, CB7; QF
2, QF
6for next circuit breaker of outlet breaker, defining corresponding FTU2, FTU6 is border FTU; QF
3, QF
4, QF
5for opening circuit centre, LB is interconnection switch, defines corresponding FTU3, FTU4, FTU8, FTU5 are middle FTU, and FTU8 is only in the reception or the transmission that participate in block signal under LB closure state; When normal operation, LB is in off-state, each self-powered of both sides, and region 1,2,3,4 is powered by a-power supply, and region 5,6,7 is powered by B-source; Power supply turns while supplying, relevant circuit breaker tripping, and LB is closed, completes the confession that turns of power supply.
2. the structure of power distribution automation
As shown in Figure 2, main website is positioned at control centre to the structure of power distribution automation, is core and the brain of distribution automation, has realized on the whole the functions such as SCADA, feeder automation (FA).Substation (communication concentrator) is generally positioned at transformer station, belong to network tandem equipment, play a part to form a connecting link, the information that is dispersed in the distribution terminal on distribution line is pooled together and is uploaded to main website, the information that main website is issued is transmitted to corresponding distribution terminal.Distribution terminal comprises line feed terminals FTU, distribution transformer terminals TTU, switching station terminal D TU etc.
3. the communication of electrical power distribution automatization system
1) communicating by letter between main website and distribution terminal;
Communication between main website and terminal adopts CLIENT/SERVER MODEL.Data send report (Reporting) model that adopts IEC 61850, so both can guarantee the transmission of normal data, again can be by abnormal data release quickly.
2) communicating by letter between distribution terminal and distribution terminal;
Between terminal and terminating layer, use CLIENT/SERVER MODEL and general GSE model.GSE comprises transformer substation case (GOOSE) and the general substation state event (GSSE) towards general object.GSE adopts broadcast mode, and the time delay of transmission is had to strict restriction.Network between feeder line layer and terminating layer is branching networks, and the IED on same branching networks generally can be not a lot, in order to realize the quick function of some feeder line layers, can adopt GSE model.It is inner that the use of GSE should be limited in feeder line layer, avoids causing the obstruction of backbone network.
The communication network of distribution automation system adopts the IP network infrastructure of layering, is divided into backbone network and branching networks.Backbone network connects control centre and transformer station, and branching networks connect together the terminal equipment being dispersed on each distribution line, and Bing Yu transformer station is connected.Backbone network need to be selected fiber optic network at a high speed.At present, the SDH backbone network that most of power supply enterprises build up, can provide bandwidth more than 100Mbps, meets the demand of distribution automation and other automated systems.Along with the reduction of optical fiber price, fiber optic network has become the important form of branching networks, and wireless public network and broadband power line carrier be form as a supplement.At present, Industrial Ethernet and ethernet passive optical network (EPON) are widely used in distribution automation communication network.
The configuration of neighbouring relations between 4.FTU
By main website, by the neighbouring relations between the topological structure configuration FTU of system, FTU2, FTU3, FTU4, FTU8, FTU5, FTU6 be adjacent the superior and the subordinate each other, experience after overcurrent, send out mutually block signal.
5. between fault detect and FTU, communicate by letter
In circuit, arbitrary FTU has experienced overcurrent, the existence of fault detected.The FTU that experiences overcurrent sends block signal to its adjacent the superior and the subordinate.If all FTU all can't detect overcurrent, show that circuit is normal, fault-free exists.
6. the definition of electric current positive direction.
It is electric current positive direction that definition is pointed to circuit by power supply.If the sense of current monitoring is consistent with positive direction, for just; Otherwise, for negative.
7. the location after fault and isolation, realizes the quick protection of distribution line.
1), for border FTU, if experience overcurrent and fault current direction for just, do not receive block signal, respective circuit breakers action; If experience overcurrent and fault current direction for negative, respective circuit breakers action;
2) for middle FTU, experience overcurrent, and only receive a side block signal or do not receive block signal, respective circuit breakers action; Otherwise respective circuit breakers is failure to actuate.
3) T after fault
2(T
2>T
1) time, i.e. t=T
2constantly, if still there is overcurrent, outlet breaker action, realizes the protection of fault between border FTU and wire-outgoing breaker.
Applied analysis:
(1) when a-power supply is powered separately, as shown in Figure 3:
1) fault if k1 place is short-circuited,
Only have CB1 to experience overcurrent, other FTU impressions are less than overcurrent, and respective circuit breakers can not be moved.At time delay T
2after time, CB1 still can experience overcurrent, controls outlet breaker tripping operation, successfully excises circuit k1 place fault.
2) fault if k2 place is short-circuited,
CB1, border FTU2, middle FTU3 experience overcurrent.
At t=T
1constantly, border FTU2 experiences overcurrent and overcurrent direction for just, and receives the block signal of FTU3 side, and respective circuit breakers locking, is failure to actuate; Middle FTU3 experiences overcurrent, and only receives the block signal of FTU2 mono-side, respective circuit breakers action.Circuit k2 place fault is excised in success.
At t=T
2constantly, can't detect overcurrent in circuit, CB1, border FTU2 protect involution.
3) fault if k3 place is short-circuited,
CB1, border FTU2, middle FTU3, middle FTU4 experience overcurrent.
At t=T
1constantly, border FTU2 experiences overcurrent and overcurrent direction for just, and receives the block signal of FTU3 side, and respective circuit breakers locking, is failure to actuate; Middle FTU3 experiences overcurrent, and receives that respective circuit breakers locking, is failure to actuate from the block signal of FTU2, FTU4 both sides.Middle FTU4 experiences overcurrent, and only receives the block signal of FTU3 mono-side, respective circuit breakers action.Circuit k3 place fault is excised in success.
At t=T
2constantly, can't detect overcurrent in circuit, CB1, border FTU2, middle FTU3 protect involution.
(2) load transfer, region 1,2,3,4 turns confession by B-source.
Now interconnection switch LB is closed, as shown in Figure 4.
1) fault if k4 place is short-circuited,
Only have CB7 to experience overcurrent.Other FTU impressions are less than overcurrent, and respective circuit breakers can not be moved.At time delay T
2after time, CB7 still can experience overcurrent, controls outlet breaker tripping operation, successfully excises circuit k4 place fault.
2) fault if k2 place is short-circuited,
CB7, border FTU6, middle FTU5, middle FTU8, middle FTU4 experience overcurrent.
At t=T
1constantly, border FTU6 experiences overcurrent and overcurrent direction for just, and receives the block signal from FTU5 mono-side, and respective circuit breakers locking, is failure to actuate; Middle FTU5 receives that respective circuit breakers locking, is failure to actuate from the block signal of FTU8, FTU6 both sides.Middle FTU8 receives that respective circuit breakers locking, is failure to actuate from the block signal of FTU4, FTU5 both sides.Middle FTU4 only receives the block signal of FTU8 mono-side, respective circuit breakers action.Circuit k2 place fault is excised in success.
At t=T
2constantly, can't detect overcurrent in circuit, CB7, border FTU6, middle FTU5, middle FTU8 protect involution.
3) fault if k1 place is short-circuited,
CB7, border FTU6, middle FTU5, middle FTU8, middle FTU4, middle FTU3, border FTU2 all experience overcurrent.Border FTU2 experiences overcurrent and overcurrent direction is negative, controls respective circuit breakers action, successfully excises circuit k3 place fault.
At t=T
1constantly, border FTU6 experiences overcurrent and overcurrent direction for just, and receives the block signal from FTU5 mono-side, and respective circuit breakers locking, is failure to actuate; Middle FTU5 receives that respective circuit breakers locking, is failure to actuate from the block signal of FTU8, FTU6 both sides.Middle FTU8 receives that respective circuit breakers locking, is failure to actuate from the block signal of FTU4, FTU5 both sides.Middle FTU4 receives that respective circuit breakers locking, is failure to actuate from the block signal of FTU3, FTU8 both sides.Middle FTU3 receives that respective circuit breakers locking, is failure to actuate from the block signal of FTU2, FTU4 both sides.
At t=T
2constantly, can't detect overcurrent in circuit, CB7, border FTU6, middle FTU5, middle FTU8, middle FTU4, middle FTU3 protect involution.
(3) load transfer, region 3,4 turns confession by B-source, and region 1,2 is still powered by a-power supply
Now interconnection switch LB is closed, and QF3 is normally open, as shown in Figure 5.Below only take B-source power supply area as example analysis.
1) fault if k4 place is short-circuited,
Only have CB7 to experience overcurrent.Other FTU impressions are less than overcurrent, and respective circuit breakers can not be moved.At time delay T
2after time, CB7 still can experience overcurrent, controls outlet breaker tripping operation, successfully excises circuit k4 place fault.
2) fault if k2 place is short-circuited,
CB7, border FTU6, middle FTU5, middle FTU8, middle FTU4 experience overcurrent.
At t=T
1constantly, border FTU6 experiences overcurrent and overcurrent direction for just, and receives the block signal from FTU5 mono-side, and respective circuit breakers locking, is failure to actuate; Middle FTU5 receives that respective circuit breakers locking, is failure to actuate from the block signal of FTU8, FTU6 both sides.Middle FTU8 receives that respective circuit breakers locking, is failure to actuate from the block signal of FTU4, FTU5 both sides.Middle FTU4 only receives the block signal of FTU8 mono-side, respective circuit breakers action.Circuit k2 place fault is excised in success.
At t=T
2constantly, can't detect overcurrent in circuit, CB7, border FTU6, middle FTU5, middle FTU8 protect involution.
(4) LB disconnects, the analysis of B-source power supply area, and B-source is out of service, the analysis while turning confession by A station power supply in like manner, is no longer described in detail.
Claims (4)
1. the two-way latch-up protection method of distribution line based on power direction judgement, is characterized in that: definition FTU is border FTU and middle FTU, and FTU is after experiencing overcurrent, and the FTU of Xiang Qi the superior and the subordinate sends block signal; For border FTU, except whether experiencing overcurrent, overcurrent direction according to it, and T at the appointed time
1inside whether receive or receive the block signal of one or both sides, control respective circuit breakers action or locking; For middle FTU, according to it, whether experience overcurrent, and T at the appointed time
1inside whether receive or receive the block signal of one or both sides, control respective circuit breakers action or locking; If T after fault
2, still there is overcurrent in the time, outlet breaker action, realizes the protection of fault between border FTU and wire-outgoing breaker.
2. the two-way latch-up protection method of distribution line based on power direction judgement according to claim 1, it is characterized in that: described distribution line is the duplicate supply distribution network of closed loop design, open loop operation, the next FTU of definition power outlet circuit breaker is border FTU, and all the other whole FTU are middle FTU; It is electric current positive direction that definition is pointed to circuit by power supply, if the sense of current monitoring is consistent with positive direction, for just; Otherwise, for negative.
3. the two-way latch-up protection method of distribution line based on power direction judgement according to claim 2, is characterized in that: described T
2>T
1.
4. the two-way latch-up protection method of distribution line based on power direction judgement according to claim 3, is characterized in that in system, all FTU, after experiencing overcurrent, send out block signal to its adjacent FTU of the superior and the subordinate immediately, and start timing;
(1) work as t=T
1time, each FTU that experiences overcurrent adds up it and whether receives and receive a side or the block signal of both sides, and determines whether action according to following criterion:
<a> is for border FTU, if experience overcurrent and fault current direction for just, do not receive block signal, respective circuit breakers action; If experience overcurrent and fault current direction for negative, respective circuit breakers action; In other situations, respective circuit breakers is failure to actuate;
<b>, for middle FTU, experiences overcurrent, and only receives a side block signal or do not receive block signal, respective circuit breakers action; Otherwise respective circuit breakers is failure to actuate;
(2) work as t=T
2time, if still there is overcurrent in circuit, outlet breaker action, realizes the protection of fault between border FTU and wire-outgoing breaker.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105633922A (en) * | 2016-01-18 | 2016-06-01 | 四川东大恒泰电气有限责任公司 | Logic protection device for parallel node fault of electric loop |
| CN106451374A (en) * | 2016-06-30 | 2017-02-22 | 国网山东省电力公司日照供电公司 | Power distribution network bidirectional allow type protection method based on FTU role identification |
| CN108123424A (en) * | 2017-12-29 | 2018-06-05 | 国电南瑞科技股份有限公司 | A kind of ring network power supply relay protecting method for taking into account quick-action and selectivity |
| CN110323724A (en) * | 2019-06-25 | 2019-10-11 | 国网浙江省电力有限公司金华供电公司 | A kind of the ring distribution system protective relaying device and control method of automatic discriminating direction |
| CN111244945A (en) * | 2020-01-20 | 2020-06-05 | 天津市中力神盾电子科技有限公司 | Power distribution parameter consistency detection method and system |
| CN114530834A (en) * | 2022-02-23 | 2022-05-24 | 南京国电南自电网自动化有限公司 | Power distribution network line current locking type incomplete differential protection method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105633922A (en) * | 2016-01-18 | 2016-06-01 | 四川东大恒泰电气有限责任公司 | Logic protection device for parallel node fault of electric loop |
| CN105633922B (en) * | 2016-01-18 | 2018-08-21 | 四川东大恒泰电气有限责任公司 | A kind of logical formula protective device of electric loop sys node failure |
| CN106451374A (en) * | 2016-06-30 | 2017-02-22 | 国网山东省电力公司日照供电公司 | Power distribution network bidirectional allow type protection method based on FTU role identification |
| CN108123424A (en) * | 2017-12-29 | 2018-06-05 | 国电南瑞科技股份有限公司 | A kind of ring network power supply relay protecting method for taking into account quick-action and selectivity |
| CN108123424B (en) * | 2017-12-29 | 2019-09-24 | 国电南瑞科技股份有限公司 | A kind of ring network power supply relay protecting method for taking into account quick-action and selectivity |
| CN110323724A (en) * | 2019-06-25 | 2019-10-11 | 国网浙江省电力有限公司金华供电公司 | A kind of the ring distribution system protective relaying device and control method of automatic discriminating direction |
| CN110323724B (en) * | 2019-06-25 | 2022-04-19 | 国网浙江省电力有限公司金华供电公司 | Annular power distribution network relay protection device capable of automatically judging direction and control method |
| CN111244945A (en) * | 2020-01-20 | 2020-06-05 | 天津市中力神盾电子科技有限公司 | Power distribution parameter consistency detection method and system |
| CN114530834A (en) * | 2022-02-23 | 2022-05-24 | 南京国电南自电网自动化有限公司 | Power distribution network line current locking type incomplete differential protection method |
| CN114530834B (en) * | 2022-02-23 | 2023-10-31 | 南京国电南自电网自动化有限公司 | Power distribution network line current locking type incomplete differential protection method |
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Application publication date: 20141210 |