CN106771844B - A kind of power network multipoint line Fault Locating Method and system - Google Patents
A kind of power network multipoint line Fault Locating Method and system Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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 present invention provides a kind of power network multipoint line Fault Locating Method and systems, the system includes: the traveling wave ranging device and sensor that the outlet of every main line of substation is arranged in, the filter of every branch head end of the main line is set, wherein, the wave arrestment frequency of each filter is all different, the sensor receives the travelling wave signal of failure point reflection and is transferred to the traveling wave ranging device, the traveling wave ranging device receives the fault traveling wave signal, determine the route to break down and measuring and calculating fault point at a distance from the traveling wave ranging device according to the frequency spectrum of the fault traveling wave signal and catadioptric temporal information, determine the position broken down.The present invention makes fault traveling wave signal have additional frequency spectrum information, the traveling wave information by analyzing fault point determines the location of fault point, can rapidly and accurately judge the position that failure occurs by the way that the filter with different wave arrestment frequencies is arranged on each route.
Description
Technical field
The present invention relates to power protection technology field more particularly to a kind of power network multipoint line Fault Locating Method and
System.
Background technique
Power circuit is the chief component of power network, overhead transmission line accident account for about the 80% of power system accident with
On.With the development of fault localization technology, the power circuit of branch does not include that the fault localization of cable and overhead transmission line is more next
It is more mature, the workload of maintenance personnel is reduced, and reduce the forced outage time.But in the huge distribution network of data
In, distribution line majority has a plurality of branch.With the raising of smart grid technology and power supply quality, multiterminal are powered so that matching
Electric line is more complicated.How accurate, the rapid position of failure point for determining distribution line is timely reparation power circuit, improves confession
The premise of electric reliability.
China's power distribution network generally uses neutral point small current neutral grounding system, and route single-phase earthing allows to continue to run.At this point,
As found fault point not in time and eliminating, often development is that line to line fault trips.Localization of fault with branched line, present one
As realized by intelligent distribution network or Distribution Automation Technology.Wherein, short trouble can be protected by power current and be carried out
Differentiate and be isolated, singlephase earth fault carries out interval judgement by acquiring more complicated transient signal.Certainly, using GPS
The ranging of branched line may be implemented in clock synchronization and multiterminal travelling wave ranging technology.Generally, above method requires means of communication, and
And judgement is section where fault point, both two routes between distribution terminal or fault detector.If among route
Zai You branch will be unable to judge；Moreover, these methods are with high costs, it is less likely to be used widely in power distribution network.
Electric pulse when traveling wave method is punctured using line fault point measures the electric pulse of disruptive discharge at failure from fault point
Time to test point can calculate fault point distance.Traveling wave fault location not by fault point transition resistance, line construction etc. because
The influence of element, and range accuracy is high, therefore has obtained more being widely applied.For have branch route, same failure away from
There may be plurality of positions under, therefore single-ended traveling wave method has very big difficulty when multipoint line is applied.
Currently, have a kind of differentiation for solving the problems, such as branched line using travelling wave ranging by fault signature, it is typical such as benefit
The non-linear relation between feature is temporarily dropped with S-transformation spectral characteristic or by short trouble and busbar voltage, is obtained a kind of single-ended
Fault Locating Method.But since zero phase modulus of each branched line of power distribution network is almost the same, the feelings such as imperfect earth are not occurring
Under condition, it is difficult to distinguish branched line.
Summary of the invention
For the defects in the prior art, the present invention provides a kind of power network multipoint line Fault Locating Method and it is
System realizes the accurate purpose for determining the position of fault point in power network branched line and/or basic routing line.
In a first aspect, the present invention provides a kind of power network multipoint line fault location systems, which is characterized in that packet
It includes:
The traveling wave ranging device and sensor of the outlet of every main line of substation are set, are arranged in the main line
The filter of every branch head end on road,
Wherein, the wave arrestment frequency of each filter is all different, and the sensor receives the traveling wave of failure point reflection
Signal is simultaneously transferred to the traveling wave ranging device, and the traveling wave ranging device receives the fault traveling wave signal, according to the event
The frequency spectrum and catadioptric temporal information for hindering travelling wave signal determine that the route to break down and measuring and calculating fault point and the traveling wave are surveyed
Distance away from device determines the position broken down.
Wherein, the traveling wave ranging device includes travelling wave ranging unit and spectral analysis unit；
The spectral analysis unit for receiving the fault traveling wave signal, and to the frequency spectrum of the fault traveling wave signal into
Row analysis determines the route to break down；
The travelling wave ranging unit is used to calculate fault point and travelling wave ranging according to the catadioptric information of fault traveling wave signal
The distance of device；And it is determined at a distance from traveling wave ranging device according to the route to break down and the fault point and event occurs
The position of barrier.
Wherein, the filter is narrowband trap.
Wherein, the spectral analysis unit specifically includes:
Receiving module, for receiving the fault traveling wave signal；
Spectrum analysis module is analyzed for the frequency spectrum to fault traveling wave signal, obtains the fault traveling wave signal
The Frequency point lacked in frequency spectrum；
Fault determination module, it is corresponding with the Frequency point for being searched according to the Frequency point lacked in fault traveling wave signal
Filter, and the route to break down is determined according to the position of the filter.
According to another aspect of the present invention, a kind of power network multipoint line Fault Locating Method is provided, feature exists
In, comprising:
The fault traveling wave signal for receiving failure point reflection, according to the catadioptric time difference of the fault traveling wave signal, measuring and calculating
The fault point is at a distance from the traveling wave ranging device；
The frequency spectrum for analyzing the fault traveling wave signal obtains the Frequency point lacked in the fault traveling wave signal；
The label of the corresponding filter of Frequency point lacked described in being searched in preset filter in the line；
The route that failure occurs is determined according to the label of the filter；
The route occurred according to the failure and the fault point determine what failure occurred at a distance from traveling wave ranging device
Position.
Wherein, the wave arrestment frequency of each filter preset in the line is different from.
As shown from the above technical solution, the present invention provides a kind of power network multipoint line Fault Locating Method and system,
By the way that the sensor with different wave arrestment frequencies is arranged on each road, so where lacking fault point in fault traveling wave signal
The wave arrestment frequency of the filter of route may thereby determine that the route that failure occurs, then by the distance of the fault point calculated
The position rapidly and accurately broken down.The trouble spot judging of the Fault Locating Method of the invention is accurate, is suitable for a large amount of
The low and medium voltage distribution network of branched line.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Other attached drawings are obtained according to these figures.
Fig. 1 is the structural schematic diagram of power network multipoint line fault location system of the invention；
Fig. 2 is the flow chart of power network multipoint line Fault Locating Method of the invention.
Fig. 3 is the schematic diagram of the travelling wave ranging of power network multipoint line fault location system of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 is the structural schematic diagram of power network multipoint line fault location system of the invention, as shown in Figure 1, this is
System includes:
The traveling wave ranging device 8 and sensor 7 of the outlet of every main line of substation are set, are arranged in the master
The filter with different wave arrestment frequencies of every branch road of route.
Wherein, sensor 7 receives the fault traveling wave signal of fault point and is transferred to traveling wave ranging device 8, travelling wave ranging dress
Set 8 receive fault traveling wave signal after, determined according to the frequency spectrum of the fault traveling wave signal and catadioptric temporal information occur therefore
The route of barrier and measuring and calculating fault point determine the position broken down at a distance from the traveling wave ranging device.
In above-described embodiment, as shown in Figure 1, being connected with multiple basic routing line 3- on the bus 2 connected under main transformer 1
6, wherein there are multiple branched line 31-34, and the second level branch on branch 34 on main line 3 by taking main line 3 as an example
Route 341 is provided with filter in the head end of each branch, sensor 31a is such as provided on branch 31, is set on branch 32
It is equipped with sensor 32a etc., and the wave arrestment frequency of each sensor is all different.
It will be appreciated that above-mentioned each branched line is only used for for example, the present embodiment is not limited thereof, specifically
Branched line can be understood as supply user each branched line, the head end in each distribution line can be arranged sensor 7,
Traveling wave ranging device 8 receives the sensor of a plurality of distribution line head end, in order to be illustrated to above system, the present embodiment only with
Distribution line 3 is illustrated.
Specifically, traveling wave ranging device includes travelling wave ranging unit and spectral analysis unit, and wherein spectral analysis unit is used
In the reception fault traveling wave signal, and analysis is carried out to the frequency spectrum of the fault traveling wave signal and determines the route to break down；
Travelling wave ranging unit is used to calculate fault point and traveling wave ranging device according to the catadioptric information of fault traveling wave signal
Distance；And it is determined and is broken down at a distance from traveling wave ranging device according to the route to break down and the fault point
Position.
Travelling wave ranging unit can be used after existing fault travelling wave ranging instrument improves and be made, and such as can be used existing
Travelling wave ranging instrument carry out travelling wave ranging measuring and calculating fault point distance, then by setting processing unit analyze fault point distance
And the route to break down determines location of fault.
In addition, spectral analysis unit can specifically include:
Receiving module, for receiving the fault traveling wave signal；
Spectrum analysis module is analyzed for the frequency spectrum to fault traveling wave signal, obtains the fault traveling wave signal
The Frequency point lacked in frequency spectrum；
Fault determination module, it is corresponding with the Frequency point for being searched according to the Frequency point lacked in fault traveling wave signal
Filter, and the route to break down is determined according to the position of the filter.
Above system installs fault travelling wave ranging device in substation outlet, and branched line head end adds filter, therefore
Hinder the travelling wave signal of point due to passing through some filter, so that lacking some Frequency point in its frequency spectrum, by searching for the frequency
The corresponding filter of rate point may thereby determine that the route that failure occurs, then pass through the catadioptric time of fault traveling wave signal
It determines fault point distance, the position broken down can be accurately determined.This method is suitble to the power circuit with a plurality of branch
Fault localization positioning, including overhead line and cable run.
Narrow band filter can be used in above-mentioned setting filter, can not influence the signal for absorbing main line, reach simultaneously
The purpose of signal identification.It is arranged on corresponding branched line in addition, the number of filter also can according to need, it can be complete
It is respectively provided on the branch line of part, several branched lines can also be only set, also can be set on basic routing line, the present embodiment is not right
It is defined.
It will be appreciated that the sensor can be travelling wave current sensor, or traveling wave voltage sensor, this reality
Example is applied no longer to be described in detail.
Fig. 2 is the flow chart of power network multipoint line Fault Locating Method of the invention.
In another embodiment of the present invention, a kind of power network multipoint line Fault Locating Method is provided, such as Fig. 2 institute
Show, process includes:
S1, the fault traveling wave signal for receiving failure point reflection are surveyed according to the catadioptric time difference of the fault traveling wave signal
The fault point is calculated at a distance from the traveling wave ranging device；
Wherein, on the route in method of the invention, filter, and each filter are provided in the head end of every straight line
The wave arrestment frequency of wave device is different；
The frequency spectrum of S2, the analysis fault traveling wave signal, obtain the Frequency point lacked in the fault traveling wave signal；
S3, search in preset filter in the line described in the label of the corresponding filter of Frequency point that lacks；
S4, the route that failure occurs is determined according to the label of the filter；
S5, the route occurred according to the failure and the fault point determine that failure is sent out at a distance from traveling wave ranging device
Raw position.
In above-described embodiment, fault traveling wave signal is transferred at the traveling wave ranging device after being received by sensor
Reason.
In the above method, by receiving the travelling wave signal of fault point, since the travelling wave signal of fault point is by some filtering
Its frequency spectrum lacks some Frequency point after device, carries out frequency analysis to fault traveling wave signal, searches corresponding with the Frequency point lacked
Filter, may thereby determine that the branch where fault point and basic routing line, in conjunction with the fault point calculated in travelling wave ranging
Distance can be quickly obtained location of fault.This method trouble spot judging is accurate, the mesolow suitable for a large amount of branched lines
Power distribution network.
It include the method that traveling wave ranging device obtains the distance of fault point and the position of fault point in following embodiments
It is described in detail.
The distance of fault point, which is described in detail, to be determined according to travelling wave signal to above-mentioned traveling wave ranging device first.
As shown in figure 3, when breaking down at the F of route, will generate a traveling wave pulse signal to two sides (head end S and
End R) transmission, and catadioptric, including head end bus, line end, fault point and each point occurs in the place of wave impedance variation
At branch.Pass through sensor (current sensor IwaveOr voltage sensor Uwave) the traveling wave pulse signal reached at head end is detected, and
Traveling wave pulse signal is sent to travelling wave ranging instrument, travelling wave ranging instrument meter calculate fault traveling wave primary wave and fault point back wave when
Between difference t2-t1, the distance of calculating fault point to head end
V is traveling wave speed, substantially a fixation
Value, it is related with the dielectric coefficient in route space and magnetic capacity.By calculating fault point distance, can use and the route
Related data determines several possible position of failure point.
In addition, every branch road is provided with filter, for example, such as narrowband trap, narrow band filter can make greatly
Part traveling wave frequency spectrum passes through, and the impedance very little of power frequency, to avoid traveling wave fault location accuracy or power frequency electric pressure drop is influenced.
Since the wave arrestment Frequency point of each filter is different, as shown in Figure 1, can separately design as the filtering of 31 head end of branch
Device 31a is 1kHz, and the filter 32a of 32 head end of branch is 2kHz, and the filter 33a of 33 head end of branch is 3kHz, and branch 34 is first
The filter 34a at end is 4kHz, and the filter 341a of 341 head end of second level branched line on branch 34 is 5kHz, in above-mentioned filter
When wave device is arranged, the wave arrestment frequency point parameters of above-mentioned filter are stored in advance in traveling wave ranging device.
When there is branch to break down.After the fault traveling wave signal for the faulty line that sensor 7 receives, failed row is searched
The Frequency point lacked in the frequency spectrum of wave signal determines route that failure occurs, for example, in the above example, if received
Lack 1kHz in travelling wave signal, then can determine that branch 31 breaks down, similarly, if lacked in the fault traveling wave signal received
Few two Frequency points of 4kHz and 5kHz can then determine that the secondary branched line 341 on time branch 34 breaks down, finally tie again
Fault point distance is closed, the position of fault point can be accurately obtained.
It, can also be with it should be noted that the fetching portion sequencing of the position of the distance and fault point of above-mentioned fault point
It obtains, can also successively obtain, the present embodiment is no longer described in detail simultaneously.
In conclusion this programme passes through survey calculation fault point distance, and judge fault point branch, it can be true in substation
Determine abort situation, realizes fault localization positioning.The precision of ranging is true by the accuracy of the precision and route data of travelling wave ranging instrument
It is fixed.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, those skilled in the art should understand that；It still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these modification or
Replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (3)
1. a kind of power network multipoint line fault location system characterized by comprising
The traveling wave ranging device and sensor of the outlet of every main line of substation are set, the main line is set
The filter of every branch head end,
Wherein, the wave arrestment frequency of each filter is all different, and the sensor receives the travelling wave signal and biography of failure point reflection
Defeated to arrive the traveling wave ranging device, the traveling wave ranging device receives fault traveling wave signal, according to the fault traveling wave signal
The route and calculate fault point at a distance from the traveling wave ranging device that frequency spectrum and the determination of catadioptric temporal information are broken down,
Determine the position broken down；
The traveling wave ranging device includes travelling wave ranging unit and spectral analysis unit；
The spectral analysis unit divides the frequency spectrum of the fault traveling wave signal for receiving the fault traveling wave signal
Analysis determines the route to break down；
The travelling wave ranging unit is used to calculate fault point and traveling wave ranging device according to the catadioptric information of fault traveling wave signal
Distance；And it is determined and is broken down at a distance from traveling wave ranging device according to the route to break down and the fault point
Position；
The spectral analysis unit specifically includes:
Receiving module, for receiving the fault traveling wave signal；
Spectrum analysis module is analyzed for the frequency spectrum to fault traveling wave signal, obtains the frequency spectrum of the fault traveling wave signal
In the Frequency point that lacks；
Fault determination module, for searching filtering corresponding with the Frequency point according to the Frequency point lacked in fault traveling wave signal
Device, and the route to break down is determined according to the position of the filter.
2. system according to claim 1, which is characterized in that the filter is narrowband trap.
3. a kind of power network multipoint line Fault Locating Method characterized by comprising
The fault traveling wave signal for receiving failure point reflection, according to the catadioptric time difference of the fault traveling wave signal, described in measuring and calculating
Fault point is at a distance from traveling wave ranging device；
The frequency spectrum for analyzing the fault traveling wave signal obtains the Frequency point lacked in the fault traveling wave signal；
The label of the corresponding filter of Frequency point lacked described in being searched in preset filter in the line, wherein each filter
The wave arrestment frequency of wave device is different from；
The route that failure occurs is determined according to the label of the filter；
The route occurred according to the failure and the fault point determine the position that failure occurs at a distance from traveling wave ranging device
It sets.
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| CN110792564B (en) * | 2019-11-06 | 2020-12-15 | 华北电力大学 | A method and device for detecting and locating faults of down conductors of fan blades |
| CN118311378B (en) * | 2024-06-07 | 2024-09-06 | 国网山西省电力公司电力科学研究院 | Fault positioning method and device for power distribution network |
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