CN104764970A - Power distribution fault judgment method based on real-time topology - Google Patents
Power distribution fault judgment method based on real-time topology Download PDFInfo
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- CN104764970A CN104764970A CN201510096785.1A CN201510096785A CN104764970A CN 104764970 A CN104764970 A CN 104764970A CN 201510096785 A CN201510096785 A CN 201510096785A CN 104764970 A CN104764970 A CN 104764970A
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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 power distribution fault judgment method based on a real-time topology. The method includes the steps that when the current load current is twice a normal load current, whether the current load current is larger than a quick-break threshold current or not is judged within t1 time, if yes, it is judged that a short-circuit fault occurs, otherwise, whether the current load current is larger than an overcurrent threshold current is judged within t2 time, and if yes, it is judged that the short-circuit fault occurs; when the situation that two-phase line voltage rises, and a third phase voltage drops is detected, it is judged that a grounding fault occurs; after delay is carried out for t3 time, a different frequency signal is injected into a line, and a fault different frequency current is detected after delay is carried out for t4 time; after the short-circuit fault or the grounding fault is judged, a fault indicator sends fault information and load current information to a monitoring master station to analyze a fault point. Loads and the fault information of all branch lines of a power distribution network can be monitored in real time to judge whether the short-circuit fault or the grounding fault occurs on the power distribution lines.
Description
Technical field
The present invention relates to electron electric power technical field, particularly relate to a kind of distribution fault decision method based on real-time topology.
Background technology
Power circuit is the lifeblood of operation of power networks, it is quite fragile, any from the destruction of external force and the faulty operation of staff again while transmission of electric energy, all likely causes large-area power-cuts, even electric network from collapsing, brings significant damage to the life of social economy and the people.Therefore, carry out power circuit on-line checkingi and diagnostic method is studied, for timely handling failure, recovery system normally runs, and safeguards that power system security and user's economic interests have very important meaning.Both at home and abroad to the on-line checkingi of transmission line of electricity and diagnosis research more, and less to distribution line research, and bias toward the diagnosis after line failure and location, belong to Off-line faults diagnosis.Existing monitoring device and locating device can not accomplish Real-Time Monitoring to the running status of distribution line, can not accomplish effective diagnosis and detection, more do not possess the function of circuit initial failure being made to forecast to the transient fault of circuit.If some initial failures of distribution line can not be got rid of in time, probably develop into short trouble, work the mischief to the safe operation of electric system.
Summary of the invention
The object of the invention is to the defect solving prior art existence, in real time to the monitoring running state of distribution line, effective diagnosis and detection is made to the transient fault of circuit, get rid of the initial failure of circuit in time.
The embodiment of the present invention provides a kind of distribution fault decision method based on real-time topology, comprising:
By being arranged on the real-time detection load electric current of multiple fault detectors on power distribution network three-phase line; When current loads electric current is greater than one times, normal load electric current, within the t1 time, judge whether current loads electric current is greater than the size of quick-break threshold current; If so, then judge to be short-circuited fault; Otherwise within the t2 time, judge whether current loads electric current is greater than overcurrent threshold current further; If so, then the fault that is short-circuited is judged to be;
Three-phase circuit voltage is detected in real time by spy's frequency source injection device; Detecting that wherein two-phase line voltage distribution raises, when third phase line voltage distribution reduces, judging earth fault occurs; After the time delay t3 time by described special source injection device frequently to circuit inject alien frequencies signal and after t4 time delay by described fault detector detection failure non-power-frequency current; Wherein, t3<t4;
After short trouble or earth fault appear in judgement, failure message and load current information are sent to master station by described fault detector, analyze trouble spot by described master station.
Further, within the t3 time of time delay, whether abnormal by the described special timing of source injection device frequently detection line voltage.
Further, within the t4 time of time delay, whether abnormal by the described special timing of source injection device frequently detection line voltage.
Further, t1=40 millisecond, t2=200 millisecond, 3.5≤t3≤4 minute, 4≤t4≤4.5 minute, and the time of special signal injection is frequently 2 minutes at every turn.
Further, describedly specifically to be comprised by described fault detector detection failure non-power-frequency current: by described fault detector continuous detecting multi-group data, using that minimum for alien frequencies value group as fault non-power-frequency current.
Further, described alien frequencies signal is the low frequency signal of particular frequencies.
Further, described fault detector is digital determining device.
Further, failure message and load current information are sent to master station and specifically comprise by described fault detector: failure message, load current information are transferred to data centralization transmitter by wireless radio frequency mode by described fault detector, data are packed by described data centralization transmitter, communicate to connect through the master station of repeater by mobile public network mode and backstage.
Further, described data centralization transmitter comprises high pressure energy taking device, data-carrier store and accumulator; Described high pressure energy taking device is that data centralization transmitter is powered for induction energy fetching direct on distribution network line, and by described accumulators store electric energy; Described data-carrier store is used for storage failure information and load current.
Further, described high pressure energy taking device is LC series inductance formula energy taking device.
Implement the embodiment of the present invention, there is following beneficial effect: a kind of distribution fault decision method based on real-time topology that the embodiment of the present invention provides, multiple fault detectors that power distribution network three-phase line is installed can be utilized, the load of each separated time of monitoring power distribution network and failure message, judge whether distribution line is short-circuited fault by quick-break overcurrent method, and frequently injected and the method intelligent decision earth fault of detection line change in voltage by special; Information on load and failure message beam back master station, realize information on load information, the fault information acquisition of distribution; By master station to load current information and fault information analysis, obtain the position of trouble spot, thus the timely isolated fault section of line related operation maintenance personnel can be notified in time, thus reach rapidly removing faults and obtain object.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the distribution fault decision method based on real-time topology that the embodiment of the present invention provides;
Fig. 2 is the structural representation of the distribution network failure monitoring system of the distribution fault decision method based on real-time topology realizing the embodiment of the present invention;
Fig. 3 is the short circuit fault of power distribution network wiring diagram that the embodiment of the present invention provides;
Fig. 4 is the one-phase earthing failure in electric distribution network wiring diagram that the embodiment of the present invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
See Fig. 1, it is the process flow diagram of the distribution fault decision method based on real-time topology that the embodiment of the present invention provides, and comprises the steps:
S1: by being arranged on the real-time detection load electric current of multiple fault detectors on power distribution network three-phase line;
S2: when current loads electric current is greater than one times, normal load electric current, judge within the t1 time whether current loads electric current is greater than the size of quick-break threshold current; If so, then judge to be short-circuited fault; Otherwise enter step S3;
S3: judge within the t2 time whether current loads electric current is greater than overcurrent threshold current; If so, then the fault that is short-circuited is judged to be; Enter step S7;
S4: detect three-phase circuit voltage in real time by spy's frequency source injection device;
S5: detecting that wherein two-phase line voltage distribution raises, when third phase line voltage distribution reduces, judging earth fault occurs;
S6: after the time delay t3 time by described special source injection device frequently to circuit inject alien frequencies signal and after t4 time delay by described fault detector detection failure non-power-frequency current; Wherein, t3<t4;
S7: after short trouble or earth fault appear in judgement, failure message and load current information are sent to master station by described fault detector, analyze trouble spot by described master station.
See Fig. 2, it is the structural representation of the distribution network failure monitoring system of the distribution fault decision method based on real-time topology realizing the embodiment of the present invention.
In the present embodiment, described distribution network failure monitoring system, comprising: multiple fault detector, data centralization transmitter 100, repeater 200, master station 300 and special source injection device 400 frequently.
Fault monitoring system as shown in Figure 2 shows at least 15 fault detectors, and described fault detector is arranged on power distribution network three-phase line one by one.
Each fault detector inside is provided with a set of radio-frequency device, each radio-frequency device can form a WLAN (wireless local area network), failure message, load current information will be transferred to data centralization transmitter 100 by wireless radio frequency mode, data are packed by data centralization transmitter 100, communicate to connect through the master station 300 of repeater 200 by mobile public network mode and backstage.
During concrete enforcement, each fault detector that power distribution network three-phase line is installed is preferably digital determining device, and adopts the charged handling of insulating bar, and without the need to speciality tool, construction and maintenance are simply, conveniently.In addition, each fault detector can detection line load current, is provided with timing automatic dispensing device and calls survey device together, the convenient load variations situation obtaining power distribution network, and breakdown judge is accurate, reduces the blindness of troubleshooting.Further, each fault detector preferably adopts non-maintaining self-charging electric source, long service life.
Both are integrated into a hardware unit, are convenient to the reception to power distribution network data and transmission by described data centralization transmitter 100 and the integrated device of described repeater 200.
Described data centralization transmitter 100 comprises high pressure energy taking device 101, data-carrier store 102 and accumulator 103.Adopt high pressure energy taking device 101 and accumulator 103 associating power supply mode, can the lasting unremitting normal work of effective guarantee data centralization transmitter 100.Wherein, described high pressure energy taking device is preferably LC (inductance/capacitance) series inductance formula energy taking device, and described LC series inductance formula energy taking device also comprises standby power supply; Described standby power supply is disposable high-capacity lithium battery.Data centralization transmitter 100 can be powered by direct induction energy fetching by LC series inductance formula energy taking device from distribution network line, and accumulator 103 can as standby power supply, when distribution network line break down and power-off time can enable.The advantages such as LC series inductance formula energy taking device has not by weather effect, do not affect by line load size, the little cost of volume is low, and there is voltage measurement function, whole energy taking device safety, reliable, maintenance-free.
Data-carrier store 102 can be preferably DataLog database, can at the DBMS and minute DBMS of more than year second of local cache more than one month.When communication abnormality, data are stored in local data memory 102 and do not lose, and after monitoring communication recovery, progressively transmit data stage by stage, ensure that the high reliability of communication and data.
Described repeater 200 is communicated to connect by radio-frequency device and described fault detector, and is communicated to connect by mobile communication transceiver end P and described master station 300.
Data centralization transmitter 100 and repeater 200 can be integrated into the repeater in broad sense, both can be communicated to connect by RF (radio frequency) mode with the fault detector of front end, the mode of mobile public network can be adopted to communicate to connect with the master station 300 on backstage again, volume is little, lightweight, easy to loading and unloading.
The Main Function of the master station 300 on backstage is data acquisition, Monitor and Control.The line load that master station 300 is transmitted by receiving front-end collector, voltage; the location data such as singlephase earth fault, phase fault section; and control command can be sent read instant data, remote control of circuit breaker deciliter, remotely modifying protection definite value, front-end acquisition device parameter.
Master station 300 can independently be installed on distribution scheduling center, also combines with original major network dispatching system by standard communication protocol, and adds man-machine interface, and yardman can grasp power distribution network ruuning situation by man-machine interface comprehensively.
Special source injection device 400 is frequently for detecting the singlephase earth fault situation in power distribution network.
Referring to Fig. 3, it is the short circuit fault of power distribution network wiring diagram that the embodiment of the present invention provides.
When judging short trouble, each fault detector in Fig. 2 is detection load electric current respectively, when being greater than one times (as being greater than 100A) of normal load at ordinary times when load current sudden change, continuing through quick-break overcurrent method and judging: within t1 (as the 40ms) time, judging whether current loads electric current is greater than the size of quick-break threshold current; If so, then judge to be short-circuited fault; Otherwise within t2 (as the 200ms) time, judge whether current loads electric current is greater than overcurrent threshold current; If so, then the fault that is short-circuited is judged to be.
In figure 3, the fault if D point is short-circuited, fault detector 2,5,8 and 3,6, No. 9 indicators in loop, short circuit trouble point D place can indicate in this area loop the fault that is short-circuited, and data centralization transmitter 100 will be transferred to failure message, load current information by wireless radio frequency mode, data are packed by data centralization transmitter 100, communicate to connect through the master station 300 of repeater 200 by mobile public network mode and backstage, analyze short circuit trouble point by master station 300.
Referring to Fig. 4, it is the one-phase earthing failure in electric distribution network wiring diagram that the embodiment of the present invention provides.
Raise when spy's frequency source injection device 400 detects two-phase line voltage distribution, when another phase circuit voltage drop is low, think circuit generation single-phase earthing, signal generation apparatus is utilized to inject 220Hz alien frequencies signal to circuit after time delay certain hour (as 3.5 to 4 minutes), this alien frequencies signal is the low frequency signal (adopting low frequency signal mainly in order to reduce the decay of line distribution capacitance to this detection signal) of a particular frequencies, data centralization and transmission unit also can detect that voltage changes simultaneously, time delay another time (as 4 to 4.5 minutes) backward fault detector sends and detects alien frequencies signal command, after fault detector continuous detecting many groups (as 5 groups) data then using that minimum for alien frequencies value group as fault non-power-frequency current, be sent to data centralization transmitter 100.Alien frequencies signal can be exported examine a line fault again by the special source injection device 400 frequently of mandatory order after earth fault has a power failure.
As shown in Figure 4, if earth fault occurs D point, special after source injection device 400 injects alien frequencies frequently, then the non-power-frequency current that 3,6, No. 9 fault detectors detect forms fault loop; And the fault data detecting acquisition judges trouble spot after carrying out intellectual analysis by master station 300 pairs of fault datas after beaming back master station 300.
Implement the embodiment of the present invention, there is following beneficial effect: a kind of distribution fault decision method based on real-time topology that the embodiment of the present invention provides, multiple fault detectors that power distribution network three-phase line is installed can be utilized, the load of each separated time of monitoring power distribution network and failure message, judge whether distribution line is short-circuited fault by quick-break overcurrent method, and frequently injected and the method intelligent decision earth fault of detection line change in voltage by special; Information on load and failure message beam back master station, realize information on load information, the fault information acquisition of distribution; By master station to load current information and fault information analysis, obtain the position of trouble spot, thus the timely isolated fault section of line related operation maintenance personnel can be notified in time, thus reach rapidly removing faults and obtain object.
One of ordinary skill in the art will appreciate that all or part of flow process realized in above-described embodiment method, that the hardware that can carry out instruction relevant by computer program has come, described program can be stored in a computer read/write memory medium, this program, when performing, can comprise the flow process of the embodiment as above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (10)
1., based on a distribution fault decision method for real-time topology, it is characterized in that, comprising:
By being arranged on the real-time detection load electric current of multiple fault detectors on power distribution network three-phase line; When current loads electric current is greater than one times, normal load electric current, within the t1 time, judge whether current loads electric current is greater than the size of quick-break threshold current; If so, then judge to be short-circuited fault; Otherwise within the t2 time, judge whether current loads electric current is greater than overcurrent threshold current further; If so, then the fault that is short-circuited is judged to be;
Three-phase circuit voltage is detected in real time by spy's frequency source injection device; Detecting that wherein two-phase line voltage distribution raises, when third phase line voltage distribution reduces, judging earth fault occurs; After the time delay t3 time by described special source injection device frequently to circuit inject alien frequencies signal and after t4 time delay by described fault detector detection failure non-power-frequency current; Wherein, t3<t4;
After short trouble or earth fault appear in judgement, failure message and load current information are sent to master station by described fault detector, analyze trouble spot by described master station.
2., as claimed in claim 1 based on the distribution fault decision method of real-time topology, it is characterized in that, within the t3 time of time delay, whether abnormal by the described special timing of source injection device frequently detection line voltage.
3., as claimed in claim 1 or 2 based on the distribution fault decision method of real-time topology, it is characterized in that, within the t4 time of time delay, whether abnormal by the described special timing of source injection device frequently detection line voltage.
4. as claimed in claim 3 based on the distribution fault decision method of real-time topology, it is characterized in that, t1=40 millisecond, t2=200 millisecond, 3.5≤t3≤4 minute, 4≤t4≤4.5 minute, and the time of each alien frequencies signal injection is 2 minutes.
5. as claimed in claim 4 based on the distribution fault decision method of real-time topology, it is characterized in that, describedly specifically to be comprised by described fault detector detection failure non-power-frequency current: by described fault detector continuous detecting multi-group data, using that minimum for alien frequencies value group as fault non-power-frequency current.
6., as claimed in claim 1 based on the distribution fault decision method of real-time topology, it is characterized in that, described alien frequencies signal is the low frequency signal of particular frequencies.
7., as claimed in claim 1 based on the distribution fault decision method of real-time topology, it is characterized in that, described fault detector is digital determining device.
8. as claimed in claim 1 based on the distribution fault decision method of real-time topology, it is characterized in that, failure message and load current information are sent to master station and specifically comprise by described fault detector: failure message, load current information are transferred to data centralization transmitter by wireless radio frequency mode by described fault detector, data are packed by described data centralization transmitter, communicate to connect through the master station of repeater by mobile public network mode and backstage.
9., as claimed in claim 8 based on the distribution fault decision method of real-time topology, it is characterized in that, described data centralization transmitter comprises high pressure energy taking device, data-carrier store and accumulator; Described high pressure energy taking device is that data centralization transmitter is powered for induction energy fetching direct on distribution network line, and by described accumulators store electric energy; Described data-carrier store is used for storage failure information and load current.
10., as claimed in claim 9 based on the distribution fault decision method of real-time topology, it is characterized in that, described high pressure energy taking device is LC series inductance formula energy taking device.
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| CN104931859A (en) * | 2015-07-14 | 2015-09-23 | 国家电网公司 | Fault monitoring device based on distributed wave recording |
| CN105044560A (en) * | 2015-08-18 | 2015-11-11 | 海南电网有限责任公司三亚供电局 | Fault-adaptive-technology-based fault judgment method of power distribution network |
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| CN108267670A (en) * | 2017-12-29 | 2018-07-10 | 国家电网公司 | A kind of Distribution Network Failure studies and judges early warning system and its implementation |
| CN111458590A (en) * | 2020-04-21 | 2020-07-28 | 国网北京市电力公司 | Fault detection system of power distribution network |
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| CN108267670B (en) * | 2017-12-29 | 2020-02-04 | 国家电网公司 | Distribution network fault study and judgment early warning system and implementation method thereof |
| CN111458590A (en) * | 2020-04-21 | 2020-07-28 | 国网北京市电力公司 | Fault detection system of power distribution network |
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Application publication date: 20150708 |