CN105281304A - Quick feeder fault positioning and isolating method - Google Patents
Quick feeder fault positioning and isolating method Download PDFInfo
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- CN105281304A CN105281304A CN201510875167.7A CN201510875167A CN105281304A CN 105281304 A CN105281304 A CN 105281304A CN 201510875167 A CN201510875167 A CN 201510875167A CN 105281304 A CN105281304 A CN 105281304A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention discloses a quick feeder fault positioning and isolating method. The method includes the following steps of primary opening, primary fault reporting, primary closing, permanent fault judging and isolating. According to the primary opening step, when a circuit breaks down, an outgoing line protection switch on an outgoing line side transformer substation trips. According to the step of primary fault reporting, an intelligent feeder control terminal feeling fault currents sends the fault current value to a master station and an adjacent intelligent feeder control terminal upwards. According to the step of primary closing, the outgoing line protection switch on the outgoing line side transformer substation is closed. According to the step of permanent fault judging, after the outgoing line protection switch on the outgoing line side transformer substation is closed, if the intelligent feeder control terminal allowing the fault currents to flow through feels the fault currents for the second time, fault signals are broadcasted to other intelligent feeder control terminals, and fault signals representing permanent faults are sent to the master station. According to the step of isolating, section switches on the two sides of a fault line cut off and isolate the fault lines, and a healthy line is closed through the outgoing line protection switch on the outgoing line side transformer substation and a looped network switch to achieve power restoration.
Description
Technical field
The present invention relates to the quick feeder fault location of one and the partition method in power transmission and distribution field.
Background technology
The many feeder line control terminal of current use mainly contains centralized control terminal, Comprehensive Control terminal, three kinds, distributed AC servo system terminal.No matter be centralized control terminal or Comprehensive Control terminal, all need the information of feeder terminal unit to be aggregated into substation or main website goes process, this adds the burden of main website or substation undoubtedly, extend the time of troubleshooting, once there is problem in main website or substation, feeder line, by function out of hand, causes power supply reliability to can not get ensureing.
Along with the requirement of user to power supply reliability is more and more higher, how to improve the key that power supply reliability becomes feeder line control terminal.The development trend of feeder line control terminal is distributed local control model, and Fault Isolation and Fault Identification are transferred to line feed terminals, makes troubleshooting and emergency control function opposite independent.Only to go wrong at line feed terminals node or communication and can not correctly when handling failure, the participation of Cai You main website or substation, this kind of mode decreases the workload of main website or substation significantly, simultaneously due to the powerful controlling functions of existing Intelligent FTU and communication function, make troubleshooting more rapid, thus power supply reliability is increased, and improve the quality of power supply, simple to operate, economical and practical, adopted widely.But for important load, it is longer still inevitably to there is fault handling time in distributed AC servo system terminal, causes the defects such as non-faulting region has a power failure in short-term, and switchgear loss is large.
Summary of the invention
Goal of the invention of the present invention is to overcome the deficiencies in the prior art; a kind of feeder fault location and partition method are fast provided; its strategy adopting face to protect; comprehensively can analyze position of failure point according to the fault message of Intelligent feeder line control terminal each in power distribution network, and take quick isolating means fault to be limited in minimum zone.
A kind of technical scheme realizing above-mentioned purpose is: a kind of feeder fault location and partition method fast, comprise the following steps:
A separating brake step: when line failure, the outlet protection switch tripping operation of outgoing line side transformer station, circuit decompression, fault point insulation recovery;
Primary fault reports step: the Intelligent feeder line control terminal experiencing fault current fault curre will be sent to main website and adjacent Intelligent feeder line control terminal, and the fault message determination fault section reported according to each Intelligent feeder line control terminal by described main website;
Once to close a floodgate step: the outlet protection switch of outgoing line side transformer station closes a floodgate, and restores electricity;
Permanent fault determination step: after the outlet protection switch combined floodgate of outgoing line side transformer station, because of faulty line reclosing again, start overcurrent protection in limited time, if the Intelligent feeder line control terminal second time that fault current flows through experiences fault current, to other Intelligent feeder line control terminal Broadcast Fault signal, send the fault-signal representing permanent fault to described main website, each Intelligent feeder line control terminal starts respective exception handles simultaneously, and the number of times of record trouble appearance and protection information;
Isolation step: the block switch excision of faulty line both sides isolated fault circuit, and perfect circuit and closed a floodgate by the outlet protection switch of outgoing line side transformer station and loop networks switch and restore electricity.
Further, in described isolation step, when isolating described faulty line, described block switch will repeatedly close a floodgate and disconnect, until fault current disappears.
Further, in described isolation step, when fault current all do not experienced by the block switch of described loop networks switch both sides, described loop networks switch closes a floodgate; When fault current experienced by the block switch of any side of described loop networks switch, described loop networks switch disconnects.
Further, in described permanent fault determination step, if the Intelligent feeder line control terminal that fault current flows through does not experience fault current for the second time, then judge that transient fault appears in circuit.
Have employed the technical scheme of a kind of quick feeder fault location of the present invention and partition method, comprise the following steps: a separating brake step: when line failure, the outlet protection switch tripping operation of outgoing line side transformer station, circuit decompression, fault point insulation recovery; Primary fault reports step: the Intelligent feeder line control terminal experiencing fault current fault curre will be sent to main website and adjacent Intelligent feeder line control terminal, and the fault message determination fault section reported according to each Intelligent feeder line control terminal by described main website; Once to close a floodgate step: the outlet protection switch of outgoing line side transformer station closes a floodgate, and restores electricity; Permanent fault determination step: after the outlet protection switch combined floodgate of outgoing line side transformer station, because of faulty line reclosing again, start overcurrent protection in limited time, if the Intelligent feeder line control terminal second time that fault current flows through experiences fault current, to other Intelligent feeder line control terminal Broadcast Fault signal, send the fault-signal representing permanent fault to described main website, each Intelligent feeder line control terminal starts respective exception handles simultaneously, and the number of times of record trouble appearance and protection information; Isolation step: the block switch excision of faulty line both sides isolated fault circuit, and perfect circuit and closed a floodgate by the outlet protection switch of outgoing line side transformer station and loop networks switch and restore electricity.Its strategy adopting face to protect, comprehensively can analyze position of failure point according to the fault message of Intelligent feeder line control terminal each in power distribution network, and take quick isolating means fault to be limited in minimum zone.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of Intelligent feeder line control terminal of the present invention.
Fig. 2 is the structural representation of the central communication card of a kind of Intelligent feeder line control terminal of the present invention.Fig. 3 is the software architecture schematic diagram of the central communication card of a kind of Intelligent feeder line control terminal of the present invention.
Fig. 4 is the software architecture schematic diagram of the central communication card of a kind of Intelligent feeder line control terminal of the present invention.
Fig. 5 is that a kind of quick feeder fault location of the present invention is in the flow chart of partition method.
Embodiment
Refer to Fig. 1, the present inventor, in order to understand technical scheme of the present invention better, below by embodiment particularly, and is described in detail by reference to the accompanying drawings:
A kind of Intelligent feeder line control terminal of the present invention comprises ARM chip 11 and dsp chip 12, the ARM chip 11 that is connected with ARM chip 11 and dsp chip 12 form primary processor 1.Primary processor 1 obtains floating-point operation ability by ARM chip 11, and is obtained the DSP processing instruction strengthened by dsp chip 12; Meanwhile, on ARM chip 11 capacity of being integrated be 1M sheet on flash memory, and capacity be 196K sheet on SRAM storage chip.Described access cycle of going up in flash memory and described SRAM storage chip really reaches one-cycle instruction access, and when ARM chip 11 runs with 400MHz speed, whole primary processor 1 can reach the disposal ability of 510DMIPS; In addition ARM chip 11 also have external memory interface and built-in Peripheral Interface.
Capacity that the external memory interface of ARM chip 11 is connected be 64M extend out SRAM storage chip and capacity be 128M extend out FLASH storage chip (not shown); described extend out FLASH storage chip can stored record feeder fault event position, fault remote signalling displacement event, protection act event, remote control actions event journal; above-mentioned record does not affect by power down, still exists after turning off power supply.The described FLASH of extending out storage chip possess perfect data store with on send function.The journal being no less than 256 events, 128 remote operations or the information such as local operation record, 128 strip device exception records can be stored in the described FLASH of extending out storage chip.
A kind of Intelligent feeder line control terminal of the present invention also comprises analog quantity acquisition circuit 2, and analog quantity acquisition circuit 2 comprises current transformer 21 and voltage transformer 22, for changing strong and weak electricity signal without distortion into by from the forceful electric power signal on circuit.The strong and weak electricity signal that current transformer 21 and voltage transformer 22 gather enters modulus conversion chip 24 and carries out analog-to-digital conversion after frequency overlapped-resistable filter 23 carries out filtering process, then, digital signal after analog-to-digital conversion is admitted to dsp chip 12 and processes, because dsp chip 12 have employed synchronized sampling unit and the frequency-tracking unit of high-speed and high-density, the acquisition precision of analog quantity acquisition circuit 2 is fully guaranteed.Dsp chip 12, according to its digital signal of input, gathers the analog input of voltage, electric current, obtains electric current, voltage, active power, reactive power, phase angle, frequency and phase place.The analog signals of input modulus conversion chip 24 sends host computer to by the communication interface be positioned on modulus conversion chip 24.The analog quantity refresh rate of analog quantity acquisition circuit 2 is better than 1s.In addition maximum two-way DC quantity acquisition interface dsp chip 12 also had, DC quantity acquisition interface adopts the output of physical isolation apparatus and modulus conversion chip 24 to isolate.
Analog quantity acquisition circuit 2 supports at most the collection of 12 road of acs, and wherein common Wei six tunnel is AC voltage sampling, and six tunnels are collection and the collection of two-way DC quantity of alternating current.
The alternating current rated value of analog quantity acquisition circuit 2 is 5A/1A; the rated value of alternating voltage is 57.74V/220V; the input range of protection voltage is 0 ~ 200V/0 ~ 400V; protective current input range is 0 ~ 10A; the input range of zero-sequence current is 0 ~ 10A, and the input range of direct voltage is 0 ~ 60V.
Switch quantity acquisition circuit 3 comprises the input light-coupled isolation translation circuit 31 connecting ARM chip 11, each input interface on input light-coupled isolation translation circuit 31 is connected with an anti-interference filter 32, anti-interference filter 32 is for after carrying out anti-interference filtration to input switch amount, be input to input light-coupled isolation translation circuit 31, then be input in ARM chip 11 by input light-coupled isolation translation circuit 31.ARM chip 11 periodic scanning switching value.For eliminating mal-telecommunic ation, ARM chip 11 adopts software ant-shaking algorithm.Input light-coupled isolation translation circuit 31 is provided with altogether 20 input interfaces, and the debounce time range of ARM chip 11 arbitrarily can be arranged between 5ms ~ 60000ms, and system default is 200ms.Switch quantity acquisition circuit 3 and the connected mode of ARM chip 11 are active connection or passive connection.The input power of switch quantity acquisition circuit 3 can be selected in 4V/48V/110V/220V direct current or AC power.
Switching value output circuit 4 comprises the output light-coupled isolation translation circuit 41 connecting ARM chip 11, exports light-coupled isolation translation circuit 41 and connects relay, and by described relay often opens output signal node.Export on light-coupled isolation translation circuit 41 and be provided with altogether eight output interfaces, namely often open node for eight of corresponding relay.On described relay, each capacity often opening node is that 220V exchanges, 10A.The remote control retention time exporting light-coupled isolation translation circuit 41 is 100 ~ 60000ms, is defaulted as 200ms.
In addition, ARM chip 11 is provided with MX232 serial ports, Ethernet interface, the EPOM interface supported based on optical fiber communication, wireless communication interface and power line carrier, PLC interface, ARM chip 11 is also provided with the IEC101 communication interface supporting IEC60870-5-101 standard and the IEC104 communication interface supporting IEC60870-5-104 standard, is used for communicating with distribution center.
In the present embodiment, all Ethernet interfaces are all integrated on central communication card 5, constitute the core component of a kind of Intelligent feeder line control terminal of the present invention, the data processing of central communication card 5 and telecommunication management ability determine the overall performance of a kind of Intelligent feeder line control terminal of the present invention and even whole distributed kind of Intelligent feeder line control system, in the present embodiment, central communication card 5 adopts PowerQUICC III series processors MPC8540 or the MPC8541 of Motorola Inc..High performance embedded system is established in central communication card 5, as shown in Figure 2:
Central communication card 5 can meet the real-time calculating of the various algorithm of Fast Modular number conversion and Intelligent feeder line control terminal completely for high-speed communication requirement.In addition, the quick response that the multichannel interrupt control unit being embedded in central communication card 5 is asked the real-time process of each communication interface under can being used for supporting failure condition.RapidIO interface on central communication card 5 and PCI-X interface can be used as the spare interface of Function Extension and system upgrade in the future.
RS485 interface on central communication card 5 and CAN interface are as the affiliated each connection bus controlling submodule and central communication card 5 of ARM chip 11, the compatibility with current product had both been considered in this design, simultaneously many again a kind of high speed connected modes adopting CAN.
Two RS232 interfaces can be configured to neatly: the interface be connected with ARM chip 11, native monitoring output interface or the modem interface communicated with host computer.
Central communication card 5 is also integrated with the 2nd SDRAM memory, its speed is fast, capacity wonderful works memory chip, constitute the main storage space of a kind of Intelligent feeder line control terminal of the present invention.Capacity is: 256M.
Central communication card 5 is also integrated with the second flash storage, for depositing program code, system bootstrap routine, embedded OS core code reflection, embedded database, WebServer and various SB plug-in unit, a kind of Intelligent feeder line control terminal of the present invention powers on or from then on obtains instruction after resetting and start to perform, and its capacity is 32M.
A kind of Intelligent feeder line control terminal of the present invention will realize reliable interconnect and high-speed communication by Ethernet interface, thus realize Intelligent feeder line control terminal and carry out fast failure location, Fault Isolation, therefore, the Ethernet Interface Design in the present embodiment two gigabit ethernet interfaces, both can be used as reliability redundancy to consider, also can select flexibly according to various different connected mode; Be configured with a 100 m ethernet interface simultaneously, may be used for using with the configuration of the communication of main frame or host computer.
Supervision interface on central communication card 5, connects the independent timer with stable performance.
Central communication card 5 is also provided with debugging interface, and reset circuit 51 and clock circuit 52, for field adjustable.Major function comprises: coordinate primary processor 1 to carry out System self-test; During system cloud gray model, system cloud gray model, once walk to fly, is automatically reset by reset circuit 51 in time; And the LCD display be connected with ARM chip 11 is according to running situation, the state displays such as realization is normal, exception, fault.
In the distributed feed line automatization system of loop network, the status of each Intelligent feeder line control terminal is equivalent, all should possess stronger computing and communication capacity.The design of the software architecture of each Intelligent feeder line control terminal will take into full account the requirement of real-time of system, to the support of network service, advanced module interconnects standard and system maintenance, expansion, upgrading are convenient, Systems Software Architecture as shown in Figure 3:
Face is protected: except the information gathered except utilizing single Intelligent feeder line control terminal self; the information of other Intelligent feeder line control terminal collections in system also will be utilized to make breakdown judge and action; to protect equipment of itself or local system, therefore following condition must be possessed:
One is communication network, and two is that each Intelligent feeder line control terminal should have primary processor 1.Three is each Intelligent feeder line control terminal parallel processings, numerous Intelligent feeder line control terminals is had in the distributed feed line automatization system of loop network, each Intelligent feeder line control terminal has primary processor 1, once break down, the primary processor 1 of all Intelligent feeder line control terminals starts simultaneously and judges whether to carry out parallel processing.Serial process is then not all right.
The quick feeder fault location of one of the present invention is in partition method as shown in Figure 5:
A separating brake step: when circuit generation transient fault, the outlet protection switch tripping operation of outgoing line side transformer station, circuit decompression, fault point insulation recovery.
Primary fault reports step: the Intelligent feeder line control terminal experiencing fault current fault curre will be sent to main website and adjacent Intelligent feeder line control terminal, the fault message determination transient fault section that main website reports according to each Intelligent feeder line control terminal.
Once to close a floodgate step: the outlet protection switch of outgoing line side transformer station closes a floodgate, and restores electricity.
When circuit generation permanent fault, the outlet protection switch tripping operation of outgoing line side transformer station in a separating brake step, circuit decompression, the number of times that primary fault reports the Intelligent feeder line control terminal record trouble in step on decompression circuit to occur and protection information also report main website, namely report step identical with primary fault;
After outgoing line side transformer station outlet protection switch reclosing, namely once after combined floodgate step, because of faulty line reclosing again, start overcurrent protection in limited time.The Intelligent feeder line control terminal second time that now fault current flows through experiences fault current, to other Intelligent feeder line control terminal Broadcast Fault signal, there is permanent fault in certainty annuity, each Intelligent feeder line control terminal starts respective exception handles simultaneously, i.e. permanent fault determination step.
When circuit generation permanent fault, excised and isolated fault circuit by the block switch of faulty line both sides, and perfect circuit by the outlet protection switch reclosing of outgoing line side transformer station and loop networks switch and restore electricity, be i.e. isolation step.
Block switch corresponding to each Intelligent feeder line control terminal, according to its handling procedure, determines whether tripping operation.If use the common block switch not having current interruption ability, block switch should disconnect again after reclosing, until fault current disappears.
Loop networks switch whether reclosing, also needs the fault current information according to loop networks switch both sides Intelligent feeder line control terminal and determines.When fault current all do not experienced by the block switch of loop networks switch both sides, then reclosing; When fault current experienced by the block switch of any side, then not reclosing, with ensure loop networks switch not reclosing in faulty line.When combined floodgate order is assigned, loop networks switch is only being guaranteed could perform after faulty section is isolated.
Such as: in the circuit shown in Fig. 4, when circuit F1 place is short-circuited fault, its processing procedure is as follows:
Circuit F1 place breaks down, and fault current flows to fault point by Bulk Supply Substation bus, the outlet protection switch of Bulk Supply Substation, and the outlet protection switch CB1 of outgoing line side transformer station trips.
Experience the first Intelligent feeder line control terminal FTU1 record trouble information of fault current.
The outlet protection switch CB1 reclosing of Bulk Supply Substation.
If after generation permanent fault, namely again break down electric current time, the outlet protection switch CB1 delay tripping of Bulk Supply Substation.
Initiatively there is information to other Intelligent feeder line control terminals transmission fault in the first Intelligent feeder line control terminal FTU1 that second time experiences fault current, after other Intelligent feeder line control terminals receive fault current information, carry out outlet action judgement, judge whether corresponding block switch trips.
When circuit second time decompression; the second block switch FD2 tripping between first Intelligent feeder line control terminal FTU1 and the second Intelligent feeder line control terminal FTU2; and send tripping operation information to loop networks switch Intelligent feeder line control terminal FTU0 and looped network outlet Intelligent feeder line control terminal BJ1; loop networks switch Intelligent feeder line control terminal FTU0 and looped network outlet Intelligent feeder line control terminal BJ1 guarantees that fault does not occur on the circuit that closes on oneself; and after determining that faulty section is isolated, the outlet protection switch CB1 sending Bulk Supply Substation closes a floodgate and orders.If what the second block switch FD2 between the first Intelligent feeder line control terminal FTU1 and the second Intelligent feeder line control terminal FTU2 adopted is circuit breaker, then the first Intelligent feeder line control terminal FTU1 and the second Intelligent feeder line control terminal FTU2 just can action during reclosing, disengagement failure electric current, can reduce the action frequency of single shot reclosing thus.
It should be noted that, just can carry out when above-mentioned troubleshooting pattern only has the communication network between each Intelligent feeder line control terminal intact.In a more perfect feeder line control program, following back-up measures can be taked: when communication network destroys on the spot, any one Intelligent feeder line control terminal is by fault message Shang Fa main website, by main website starting protection program, the position of the localization of faults, completes Fault Isolation, supplies electrotransfer and restore electricity; When being also destroyed when communicating with substation, after each Intelligent feeder line control terminal finds the failure several times of transmission information, be automatically converted to control mode on the spot, this mode is similar to reclosing control mode, does not need the existence communicated.The face protected mode priority treatment of information; the feeder automation scheme automatically transferring Intelligent treatment on the spot again to is all damaged at channel and main website; both fault location in the protection scheme of face had been possessed accurate; isolation is reliable; restore electricity the feature of shortest time; eliminate again the inferior position relying on substation and channel in traditional scheme completely, have master to have standby, the situation at various scene can be met.
Those of ordinary skill in the art will be appreciated that, above embodiment is only used to the present invention is described, and be not used as limitation of the invention, as long as in spirit of the present invention, all will drop in Claims scope of the present invention the change of the above embodiment, modification.
Claims (4)
1. quick feeder fault location and a partition method, comprise the following steps:
A separating brake step: when line failure, the outlet protection switch tripping operation of outgoing line side transformer station, circuit decompression, fault point insulation recovery;
Primary fault reports step: the Intelligent feeder line control terminal experiencing fault current fault curre will be sent to main website and adjacent Intelligent feeder line control terminal, and the fault message determination fault section reported according to each Intelligent feeder line control terminal by described main website;
Once to close a floodgate step: the outlet protection switch of outgoing line side transformer station closes a floodgate, and restores electricity;
Permanent fault determination step: after the outlet protection switch combined floodgate of outgoing line side transformer station, because of faulty line reclosing again, start overcurrent protection in limited time, if the Intelligent feeder line control terminal second time that fault current flows through experiences fault current, to other Intelligent feeder line control terminal Broadcast Fault signal, send the fault-signal representing permanent fault to described main website, each Intelligent feeder line control terminal starts respective exception handles simultaneously, and the number of times of record trouble appearance and protection information;
Isolation step: the block switch excision of faulty line both sides isolated fault circuit, and perfect circuit and closed a floodgate by the outlet protection switch of outgoing line side transformer station and loop networks switch and restore electricity.
2. the quick feeder fault location of one according to claim 1 and partition method, is characterized in that: in described isolation step, and when isolating described faulty line, described block switch will repeatedly close a floodgate and disconnect, until fault current disappears.
3. the quick feeder fault location of one according to claim 1 and partition method, is characterized in that: in described isolation step, and when fault current all do not experienced by the block switch of described loop networks switch both sides, described loop networks switch closes a floodgate; When fault current experienced by the block switch of any side of described loop networks switch, described loop networks switch disconnects.
4. the quick feeder fault location of one according to claim 1 and partition method, it is characterized in that: in described permanent fault determination step, if the Intelligent feeder line control terminal that fault current flows through not second time experiences fault current, then judge that transient fault appears in circuit.
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