CN106451383A - Blocking pilot protection method suitable for closed loop operation cable distribution loop network - Google Patents
Blocking pilot protection method suitable for closed loop operation cable distribution loop network Download PDFInfo
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- CN106451383A CN106451383A CN201610926247.5A CN201610926247A CN106451383A CN 106451383 A CN106451383 A CN 106451383A CN 201610926247 A CN201610926247 A CN 201610926247A CN 106451383 A CN106451383 A CN 106451383A
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- main unit
- ring main
- stu
- locking
- positive sequence
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
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Abstract
The invention discloses a blocking pilot protection method suitable for a closed loop operation cable distribution loop network. The positive sequence fault component power directional characteristics of two inlet wires of a loop network cabinet when different locations have faults are analyzed, the loop network cabinet is divided into three states, and the unified blocking signal transmitting rules are prescribed. After the faults occur, the sudden change of current exceeds the preset threshold of STU installed in the loop network cabinet, and protection is started and automatic time checking is performed. Then each STU judges the state of the loop network cabinet and receives and transmits the blocking signals according to the prescribed rules. If the STU does not receive the blocking signals within the prescribed time period, tripping signals are transmitted to isolate the faults; and if the STU receives the blocking signals within the prescribed time period, the corresponding circuit breakers are blocked and protection automatically returns. According to the method, the exchange rules of blocking information between the adjacent STU are established according to the state of the loop network cabinet so that rapid and accurate locating of the feed line fault sections can be realized and the fault processing speed can be enhanced.
Description
Technical field
The present invention relates to the distribution line technical field of relay protection of operation with closed ring, more particularly to joining based on cable run
Electric ring network fault feature and blocking mode pilot protection method.
Background technology
Conventional electrical distribution net generally adopts " closed loop design, open loop operation " pattern, and protection control method is simple, runs operation side
Just, but can cause during load transfer and have a power failure in short-term, and cannot also meet distributed power source (Distributed Energy
Resources, DERs) a large amount of requirements for accessing.Developed countries and regions, begin with the distribution of operation with closed ring pattern both at home and abroad
Net, receives ability to improve power supply reliability with DERs.Due to the trend on operation with closed ring circuit and short circuit current two-way flow,
Existing three-step charging will can not meet the requirement of operation with closed ring.At present, adopt in the distribution looped network of operation with closed ring more
With the current differential protection method for constituting based on guide wire, the basic thought of traditional power transmission network pilot protection is still continued to use, and
Effective dock is not formed with the existing distribution automation system based on STU.It is directed to existing distribution automation system more and " pulls
The open loop operation distribution net work structure of handss ", not yet forms failure handling mechanisms effectively for operation with closed ring distribution network, and protects
Shield algorithm lacks versatility.At present, adopt cable system more urban power distribution network and in ring main unit, STU is installed, field monitoring
Fault data is uploaded to main website, realizes fault location, isolation and service restoration function, prolonged by communication under which after centralized decision-making
When, main website focus on the impact of information, speed of action is slower.
The present invention proposes a kind of closing based on positive sequence fault component power direction for the cable ring-system structure of operation with closed ring
Locking-type longitudinal protection method.By the use of jump-value of current as STU start-up criterion, and using Startup time as all STU pair when
Benchmark；According to during diverse location fault everywhere the positive sequence fault component power direction of two inlet wires of ring main unit be characterized, realize phase
In adjacent ring main unit between STU locking information exchange, accurately identify fault section, quickly isolate fault.
Content of the invention
Present invention solves the technical problem that being：Based on jump-value of current and positive sequence fault component power direction, structure is suitable to
The blocking mode pilot protection method of operation with closed ring cable distribution looped network.And own using jump-value of current as STU start-up criterion
Benchmark when STU pair；Using diverse location in loop be short-circuited fault when, the positive sequence fault of two points of incoming cables of ring main unit is divided everywhere
Amount power direction is characterized, and completes the block signal in adjacent ring main unit between STU and exchanges, realizes the quick and precisely positioning of fault
And isolation, improve power supply reliability.
The present invention solves technical problem and is adopted the technical scheme that：According to when on loop, diverse location breaks down, flow
The positive sequence fault component power direction that crosses at two service entrance switch of ring main unit, division ring main unit is tri- kinds of states of X1, X2 and X3, and sets
Block signal under fixed every kind of state in adjacent ring main unit between STU sends rule.When fault occurs, all STU monitor electricity
Stream Sudden Changing Rate is out-of-limit, and protection starts and using this moment as starting point when all STU pair, and the actuating signal will keep T1When
Between.Then, each STU extracts positive sequence fault component and calculates the positive sequence fault component power side of two points of incoming cables in corresponding ring main unit
To；According to protection positive direction and the actual positive sequence fault component power direction of regulation, ring main unit itself status are judged；Root
Rule is sent according to set block signal, the information for completing STU in adjacent ring main unit is exchanged；If ring main unit is in T2Do not receive in time
To block signal, trip signal control respective circuit breakers action, isolated fault will be sent；If receiving locking letter within a certain period of time
Number, then by corresponding circuit breaker lock, treat delay time T1After arrival, protection is returned.The method is using STU in adjacent ring main unit
Between locking information exchange, realize quick and precisely positioning and the automatism isolation of ring network fault section, eliminate terminal with main website
Between communicate link and main station system process the time delay that bulk information causes, improve troubleshooting speed.Detailed process is：
1st, for the cable distribution looped network of operation with closed ring, the positive direction for defining loop points to power transformation from transformer station M side bus
Stand N side bus (M and N be only used for mark major loop direction, the two can be same bus)；And specify that M side is upstream, under N side is
Trip.It is QF to define internal upstream (i.e. near the M side bus) chopper of certain ring main unit i in loopiM, downstream is (i.e. near N side mother
Line) chopper be QFiN.The line outlet chopper for defining transformer station M side is QF0N, the line outlet chopper of transformer station N side
For QF0M；And STU is respectively mounted at outlet breaker, block signal, control outlet open circuit can be exchanged with the STU in adjacent ring main unit
Device action.
During the fault that the 2nd, is short-circuited on diverse location on loop, using the positive sequence fault component on two inlet wires of each ring main unit
Active power (hereinafter referred to as positive sequence fault component power) direction is characterized, and all ring main units can be divided into three kinds of states.When
Ring main unit i lines upstream be short-circuited fault when, flow through its internal breaker QFiMPositive sequence fault component power direction be negative,
And flow through QFiNPositive sequence fault component power direction for just, now the ring main unit is in state X1 for definition；When ring main unit i downstream
During line failure, its internal breaker QF is flow throughiMPositive sequence fault component power direction for just, flow through QFiNPositive sequence therefore
Barrier component power direction is negative, and now the ring main unit is in state X2 for definition；When fault occurs on ring main unit i internal bus
When, flow through circuit breaker Q FiMWith QFiNPositive sequence fault component power direction be just, definition now the ring main unit be in state
X3.
3rd, on the basis of flowing through the current change quantity at looped network cabinet wire in peak load shutdown process in loop, arrange
It is I that STU starts definite valueset, when the actual current Sudden Changing Rate that STU is monitored meets Δ I ＞ Iset, then show to there occurs in loop short
Road fault, protection starts and keeps T1Time；Protection starting time automatically as all STU pair when benchmark.
4th, the STU after starting will extract forward-order current and positive sequence voltage fault component at looped network cabinet wire, ask for each
Positive sequence fault component power direction, judges place ring main unit state accordingly.If ring main unit i be in X1 state, locking its own
Circuit breaker Q FiN, while downstream the STU of ring main unit i+1 transmits locking QF(i+1)M；If ring main unit i is in X2 state, locking is certainly
Body circuit breaker Q FiMWhile transmitting the STU locking QF of upstream ring main unit i-1(i-1)N；If ring main unit i is in X3 state, transmit
STU locking QF to upstream ring main unit i-1(i-1)N, while transmitting to the STU locking QF of downstream ring main unit i+1(i+1)M.
5th, as i=0, the ring main unit is the corresponding STU of M side outlet chopper, believes except being sent upstream by locking
Breath is outer, and remaining function is identical with the STU in other ring main units；As i=k+1, the ring main unit is N side outlet chopper correspondence
STU, in addition to it can not downstream send locking information, remaining function is identical with the STU in other ring main units.And the two close
The process that lock information sends and receives is same as described above.
6th, after STU everywhere starts and asks for positive sequence fault component power direction, automatic time delay T2Time, with etc. waiting
Receive block signal.Within the time of regulation, the ring main unit for not receiving block signal will send trip signal, the open circuit of tripping fault side
Device.And locking is protected by ring main unit STU accordingly that receive block signal, and will be in time delay retention time T1After reaching, protection
Auto-returned.
Compared with prior art the invention has the beneficial effects as follows：
Method disclosed in patent of the present invention, compared with the cable distribution ring net protection method of traditional closed-loop operation, has
Significant difference；Cable system of the present invention based on distribution automation system and for operation with closed ring, it is proposed that a kind of general short
Road fault section positioning and failure separation method；Ring main unit when breaking down in loop is divided into tri- kinds of states of X1, X2 and X3,
Every kind of state corresponds to specific block signal and sends rule.When diverse location breaks down, the STU in ring main unit will be according to certainly
Body status, according to set rule transmitting-receiving block signal.Within a certain period of time, the ring main unit STU of block signal is not received
Trip signal, the action tripping operation isolated fault of control respective circuit breakers will be sent；And the STU that receives block signal is corresponding by locking
Protection, and in time delay retention time T1Reach rear auto-returned.This method is connected in each ring main unit by fiber optic Ethernet pacifies
The STU of dress, to realize the exchange of status information between adjacent ring main unit STU, completes the quick and precisely positioning of fault and isolates.Whole
Individual protection process is participated in without the need for main website, is eliminated and is processed, with master station communication link and main website, the time delay that bulk information causes, improves
Power supply reliability.
Description of the drawings
Accompanying drawing 1 is the operation with closed ring cable distribution ring network structure figure containing 4 ring main units.
Accompanying drawing 2 is f1Place breaks down, corresponding positive sequence fault component characteristic pattern.
Accompanying drawing 3 is f2Place breaks down, corresponding positive sequence fault component characteristic pattern.
Accompanying drawing 4 is f3Place breaks down, corresponding positive sequence fault component characteristic pattern.
Accompanying drawing 5 is f4Place breaks down, corresponding positive sequence fault component characteristic pattern.
Accompanying drawing 6 is f1Place breaks down, the transmission rule schema of block signal.
Accompanying drawing 7 is f2Place breaks down, the transmission rule schema of block signal.
Accompanying drawing 8 is f3Place breaks down, the transmission rule schema of block signal.
Accompanying drawing 9 is f4Place breaks down, the transmission rule schema of block signal.
Accompanying drawing 10 is blocking mode pilot protection logic chart.
Specific embodiment
The present invention proposes a kind of cable distribution looped network blocking mode pilot protection method suitable for operation with closed ring, with reference to
Example is described in detail to the present invention with accompanying drawing.
1st, protection act process analyses
Fault signature analysis are carried out by taking the cable distribution looped network containing 4 ring main units as an example, which simplifies structure such as 1 institute of accompanying drawing
Show.Wherein,For two side bus equivalent electromotive force, if two cables are from same bus,If from
The different buses of same transformer station even from different substation, then the two, but the premise that analyzes herein be in loop not
Can there is excessive circulating power, not affect the normal table of system to run.QF in ring main unitiMWith QFiN(i=1,2,3,4) equal
For chopper, during normal operation, all choppers are in operation with closed ring state all in closure state, i.e. system.Substation exit
The chopper at place is respectively QF0NWith QF5M, Intelligent power distribution terminal (smart is installed at outlet breaker and in each ring main unit
Terminal unit, STU), and connected by fiber optic Ethernet, to realize the communication in adjacent ring main unit between STU.Outlet
Chopper corresponding STU0 and STU5, can exchange locking information with the STU of other ring main units, control circuit breaker trip.
When be short-circuited in loop fault when, all STU monitor that jump-value of current is out-of-limit, protection start and keep T1When
Between；Protection Startup time is automatically as benchmark when each STU pair.
1) work as f1Place be short-circuited fault when, the positive sequence fault component feature of the looped network is as shown in Figure 2.Wherein,For
It is assumed that fault point positive sequence voltage fault component,WithRespectively positive sequence at each ring main unit bus
Voltage failure component,WithFor flowing through the forward-order current fault component of each chopper.The pros of protection in regulation ring main unit
To being to point to line direction by its internal bus；The route protection positive direction of substation exit is to point to circuit by substation bus bar
Direction；The reference current of all protection positive directions is respectivelyWith
Can be obtained by accompanying drawing 2：In trouble point f1Upstream, flow through QF1MAnd QF2MPositive sequence fault component power direction for just,
Flow through QF1NAnd QF2NPositive sequence fault component power direction be negative；I.e. ring main unit 1 and ring main unit 2 are in X2 state, ring main unit
1 by locking therein circuit breaker Q F1M, while transmitting blocked line outlet breaker QF to STU00N.Ring main unit 2 is by locking certainly
The internal QF of body2M, while upstream ring main unit 1 transmits locking QF1N.And in trouble point f1Downstream, flow through QF3MAnd QF4MJust
Sequence fault component power direction is for just, flowing through QF3NAnd QF4NPositive sequence fault component power direction be negative, i.e. ring main unit 3 and ring
Net cabinet 4 is in X1 state；Ring main unit 3 is by locking therein QF3N, while downstream ring main unit 4 transmits locking QF4M, looped network
Cabinet 4 is by locking therein QF4N, while transmitting locking outlet breaker QF to STU55M.All block signal sending directions are such as
Shown in accompanying drawing 6.All protections for executing locking, in delay time T1After arrival, all by auto-returned.
In whole loop, only ring main unit 2 and ring main unit 3 do not receive block signal at the appointed time, will tripping respectively
Circuit breaker Q F2NAnd QF3M, complete Fault Isolation.
2) work as f2Place be short-circuited fault when, corresponding positive sequence fault component feature is as shown in Figure 3.It can be seen that flowing through QF2M
And QF2NPositive sequence fault component power direction for just, i.e., ring main unit 2 is in X3 state, upstream will transmit locking by ring main unit 1
QF1N, while downstream ring main unit 3 transmits locking QF3M；X2 state is in the ring main unit 1 of trouble point upstream, by locking itself
Internal QF1M, while transmitting locking outlet breaker QF to STU00N；It is in the ring main unit 3 of trouble point downstream and ring main unit 4
X1 state, ring main unit 3 is by locking therein QF3N, while transmitting to 4 locking QF of ring main unit4M.Ring main unit 4 is by locking itself
Portion QF4N, while transmitting locking outlet breaker QF to STU55M.All protections for executing locking, in delay time T1After arrival,
All by auto-returned.
In whole loop, only ring main unit 2 does not receive block signal at the appointed time, just tripping circuit breaker respectively
QF2MWith QF2N, complete Fault Isolation.
3) work as f3Place be short-circuited fault when, corresponding positive sequence fault component feature is as shown in Figure 4.Owned by Tu Ke get
Ring main unit is in X1 state, and ring main unit 1 is by locking therein QF1N, while downstream ring main unit 2 transmits locking QF1M；Under
Trip ring main unit 2, ring main unit 3 and ring main unit 4 all rule will send corresponding block signal according to this.STU5 at N side outlet is only received
Block signal, locking circuit breaker Q F5M, and no longer downstream send locking information.All protections for executing locking, in delay time
T1After arrival, all by auto-returned.
In whole loop, only have STU0 not receive block signal, STU0 tripping QF at the appointed time with ring main unit 10N,
1 tripping QF of ring main unit1M, so as to complete Fault Isolation.
4) work as f4Place be short-circuited fault when, corresponding positive sequence fault component feature as shown in Figure 5, is owned by Tu Ke get
Ring main unit is in X2 state.Ring main unit 4 is by locking therein QF4M, while upstream ring main unit 3 transmits locking QF3N；Therefore
The barrier point ring main unit 1 of upstream, ring main unit 2 and ring main unit 3 all will the rule corresponding block signals of transmission according to this.At M side outlet
STU0 only receives block signal, completes locking circuit breaker Q F0N, no longer it is sent upstream by locking information.All protections for executing locking,
In delay time T1After arrival, all by auto-returned.
In whole loop, ring main unit 4 does not all receive block signal, 4 tripping of ring main unit at the appointed time with STU5
QF4N, STU5 tripping QF5M, complete Fault Isolation.
2nd, fixed value adjusting principle is protected
By the use of jump-value of current as starting element, adjusted according to the starting current of peak load on circuit is escaped,
I.e.：
Wherein：KrelFor safety factor；KSSStarting current times for peak load；ILoad.maxBy accessing in the network
Maximum motor plant capacity, KreFor drop-off to pick-up radio.
3rd, protection act logic
Using jump-value of current as starting element, using the positive sequence fault component power direction of two points of incoming cables of each ring main unit
Foundation being characterized as, rule is sent according to set block signal, builds cable distribution looped network blocking mode pilot protection.Its action is patrolled
Collect as shown in Figure 10, wherein SiRepresent ring main unit i, T1For starting element retention time, T2For the locking letter to be received such as ring main unit
Number delay time, T3For the trip signal retention time.
Claims (3)
1. a kind of blocking mode pilot protection method suitable for operation with closed ring cable distribution looped network, it is characterised in that：
(1) positive direction of the regulation from transformer station M side bus to transformer station N side bus for looped network, it is downstream that M side is upstream, N side；
Whole loop is assumed comprising k ring main unit, the lead-in circuit breaker for defining upstream side (i.e. near M side bus) in ring main unit i is
QFiM, the lead-in circuit breaker of downstream (i.e. near N side bus) is QFiN.It is QF to define transformer station M side line way outlet chopper0N,
N side line way outlet chopper is QF0M, and QF0NAnd QF0MPlace is respectively mounted STU, participate in the locking between other ring main units STU with
Action is tripped.
(2) when ring main unit i lines upstream breaks down, its internal breaker QF is flow throughiMPositive sequence fault component power direction
It is negative, flows through QFiNPositive sequence fault component power direction for just；The ring main unit is defined in X1 state.
(3) when ring main unit i downstream line breaks down, its internal breaker QF is flow throughiMPositive sequence fault component power direction
For just, flowing through QFiNPositive sequence fault component power direction be negative, define the ring main unit in X2 state.
(4) when ring main unit i internal bus break down, its internal breaker QF is flow throughiMAnd QFiNPositive sequence fault component power
Direction is just, and defines the ring main unit in X3 state.
(5) the corresponding STU of M side line way outlet chopper, sends in addition to block signal function to its upstream except not possessing, other functions
Identical with the STU in ring main unit；The corresponding STU of N side line way outlet chopper, except do not possess to downstream send block signal work(
Can be outer, other functions are identical with the STU in ring main unit.The STU in both sides exit can be considered as special ring main unit.
2. method according to claim 1, it is characterised in that：All ring main unit i in X1 state, by locking therein
Circuit breaker Q FiNAnd actively transmit to STU locking circuit breaker Q F in the ring main unit of downstream(i+1)M；All ring main unit i in X2 state,
Circuit breaker Q F by locking thereiniMAnd actively transmit to upstream ring main unit STU locking circuit breaker Q F(i-1)N；All in X3 shape
The ring main unit i of state, active is transmitted to upstream ring main unit STU locking QF(i-1)N, while transmitting to downstream ring main unit STU locking
QF(i+1)M.
3. method according to claim 2, it is characterised in that：When in distribution looped network, diverse location breaks down, can go out
Now different degrees of current break, as protection start-up criterion, and can protect Startup time as benchmark when all STU pair；Root
Fault section being determined according to each ring main unit status after fault, and completes the letter of the locking between adjacent ring main unit within a certain period of time
Number transmitting-receiving, and then completes trip protection, realizes the automatism isolation of fault section, thus constitute suitable for operation with closed ring cable distribution
The blocking mode pilot protection of looped network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610926247.5A CN106451383B (en) | 2016-10-24 | 2016-10-24 | A kind of blocking mode pilot protection method suitable for operation with closed ring cable distribution looped network |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610926247.5A CN106451383B (en) | 2016-10-24 | 2016-10-24 | A kind of blocking mode pilot protection method suitable for operation with closed ring cable distribution looped network |
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| CN106451383A true CN106451383A (en) | 2017-02-22 |
| CN106451383B CN106451383B (en) | 2018-07-31 |
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Cited By (3)
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| CN106997020A (en) * | 2017-03-20 | 2017-08-01 | 中国石油大学(华东) | A kind of cable distributor track network fault positioning method based on forward-order current fault component phase bit comparison |
| CN111224388A (en) * | 2020-02-19 | 2020-06-02 | 国电南瑞科技股份有限公司 | Node interlocking protection method suitable for multiple power supply modes |
| CN112290518A (en) * | 2020-10-23 | 2021-01-29 | 珠海许继电气有限公司 | Intelligent distributed feeder protection method and system based on 5G communication |
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| CN111224388A (en) * | 2020-02-19 | 2020-06-02 | 国电南瑞科技股份有限公司 | Node interlocking protection method suitable for multiple power supply modes |
| CN112290518A (en) * | 2020-10-23 | 2021-01-29 | 珠海许继电气有限公司 | Intelligent distributed feeder protection method and system based on 5G communication |
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| Publication number | Publication date |
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| CN106451383B (en) | 2018-07-31 |
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