CN104865495A - Travelling wave positioning method and system for electric power line fault - Google Patents
Travelling wave positioning method and system for electric power line fault Download PDFInfo
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- CN104865495A CN104865495A CN201510137616.8A CN201510137616A CN104865495A CN 104865495 A CN104865495 A CN 104865495A CN 201510137616 A CN201510137616 A CN 201510137616A CN 104865495 A CN104865495 A CN 104865495A
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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
Abstract
The invention relates to a traveling wave positioning method and system for an electric power line fault. The method comprises the following steps that: when a fault occurs at an electric power line actually, a time different between arrival at a front end of the electric power line and arrival at a tail end of the electric power line of a fault travelling wave generated at an actual fault point is obtained; an actual fault section is determined according to the time different between arrival at the front end of the electric power line and arrival at the tail end of the electric power line of the fault travelling wave generated at the actual fault point as well as a reference travelling wave time difference array; a proportion of a distance between the actual fault point and a selected simulated fault point in the actual fault section to the line length of the actual fault section is obtained; and according to the proportion as well as location of all towers or cable connectors at the actual fault section, the accurate location of the actual fault point is determined. According to the invention, the principle is simple; measurement on the length and the travelling wave velocity of the electric power line is not needed; the fault point positioning result is not influenced by the sag of the electric power line; and engineering realization becomes easy. Moreover, the algorithm is simple; the practicability and positioning precision are high; and the method and system have broad application prospects.
Description
Technical field
The present invention relates to power circuit technical field, particularly relate to a kind of feeder line fault travelling wave positioning method and system.
Background technology
Power circuit comprises overhead transmission line and cable line.Overhead transmission line navigates within hill more, and cable line is buried in underground, trouble spot detection & localization difficulty, accurately the searching of trouble spot, to remove and fast recovery of power supply is electric system long-standing puzzles fast.Feeder line fault quick, accurately locate, greatly can shorten the time of fault restoration, reduce because of the loss that causes of having a power failure, improve the reliability of operation of power networks, there is great Social and economic benef@.
Current power line fault localization method mainly contains traditional impedance type localization method and row ripple localization method, and impedance type localization method is subject to the impact of the factors such as distributed capacitance, supply load, neutral operation method change, and positioning error is larger.Row ripple localization method principle is simple, and be not subject to the impact of the factors such as systematic parameter, fault type, mutual inductor mapping fault and transition resistance in theory, positioning precision is high; But row ripple localization method needs known power circuit length and traveling wave speed.And line length is because being subject to the impact of season, environment temperature, wind speed, load variations, also there is error in line design length and physical length, due to the difference of shaft tower tension force and landform, make sag variation range comparatively large, thus cause the exact length of circuit to there is certain uncertainty.The accurate velocity of wave of circuit traveling wave is subject to the impact of the factors such as line parameter circuit value, change, running status change frequently, also has certain uncertainty.The accurate defining method of electric network functional failure travelling wave transmission velocity of wave has usually:
(1) utilize actual measurement route parameter calculation velocity of wave, the method needs other extension set to carry out real-time measuring circuit parameter, and because the line parameter circuit value relevant to velocity of wave is more, measuring process is complicated, causes the computational accuracy of velocity of wave low;
(2) circuit traveling wave speed is surveyed, when circuit external area error or circuit close a floodgate, both-end travelling wave positioning system is utilized to measure traveling wave speed in real time, the method needs known line length, and row ripple has dispersion characteristics in communication process, make the attenuation distortion in communication process of row ripple, easily reduce wave speed measurement precision.
Summary of the invention
Based on this, for the measuring accuracy of solution power circuit length, traveling wave speed affects a difficult problem for electric network functional failure travelling wave positioning precision, the invention provides a kind of feeder line fault travelling wave positioning method, without the need to measuring power circuit length and traveling wave speed, for the capable ripple positioning precision of raising feeder line fault, there is profound significance.
For achieving the above object, the embodiment of the present invention adopts following technical scheme:
A kind of feeder line fault travelling wave positioning method, comprises the steps:
When power circuit is actual break down time, obtain the mistiming that fault traveling wave that actual fault point produces arrives power circuit head end and line end;
The fault traveling wave produced according to described actual fault point arrives mistiming of power circuit head end and end and reference row ripple time difference array judges physical fault section; Described reference row ripple time difference array comprises the fault traveling wave that simulated failure point produces and is transferred to mistiming of power circuit head end and end;
The distance obtained in described actual fault point and described physical fault section between selected simulated failure point accounts for the ratio of the line length of described physical fault section;
The accurate location of actual fault point is determined according to the position of each shaft tower or cable splice in described ratio and described physical fault section.
Accordingly, the embodiment of the present invention also provides a kind of feeder line fault travelling wave positioning system, comprising:
Fault traveling wave mistiming acquisition module, for power circuit is actual break down time, obtain the mistiming that fault traveling wave that actual fault point produces arrives power circuit head end and line end;
Fault section determination module, arrives mistiming of power circuit head end and end for the fault traveling wave that produces according to described actual fault point and reference row ripple time difference array judges physical fault section; Described reference row ripple time difference array comprises the fault traveling wave that simulated failure point produces and is transferred to mistiming of power circuit head end and end;
Length ratio computing module, accounts for the ratio of the line length of described physical fault section for the distance obtained in described actual fault point and described physical fault section between selected simulated failure point;
Locating module, for determining the accurate location of actual fault point according to the position of each shaft tower or cable splice in described ratio and described physical fault section.
The present invention is based on reference row ripple time difference array, fault traveling wave when only need compare physical fault arrives the size of each element in mistiming of circuit first and last end and reference row ripple time difference array, then can judge physical fault section, accounting for the ratio of physical fault section total length by calculating arbitrary simulated failure point in actual fault point to physical fault section, determining the exact position of actual fault point.The principle of the invention is simple, without the need to measuring power circuit length and traveling wave speed, localization of fault result is not by the impact of power circuit sag, be easy to Project Realization, algorithm of the present invention is simple, practical, positioning precision is high, can get rid of for feeder line fault and foundation is more accurately provided, have broad application prospects.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of feeder line fault travelling wave positioning method in the embodiment of the present invention;
Fig. 2 is the structural representation of 35kV cable-aerial blended electric power circuit in the embodiment of the present invention;
Fig. 3 is power circuit head end M in the embodiment of the present invention
1the voltage traveling wave waveform schematic diagram of place's fault traveling wave harvester record;
Fig. 4 is power circuit terminal M in the embodiment of the present invention
6the voltage traveling wave waveform schematic diagram of place's fault traveling wave harvester record;
Fig. 5 is the structural representation of feeder line fault travelling wave positioning system in the embodiment of the present invention;
Fig. 6 is the structural representation of locating module 400 in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, content of the present invention is further described.
As shown in Figure 1, the present embodiment provides a kind of feeder line fault travelling wave positioning method, comprises the steps:
S100 when power circuit is actual break down time, obtain the mistiming that fault traveling wave that actual fault point produces arrives power circuit head end and line end;
The fault traveling wave that S200 produces according to described actual fault point arrives mistiming of power circuit head end and end and reference row ripple time difference array judges physical fault section; Described reference row ripple time difference array comprises the fault traveling wave that simulated failure point produces and is transferred to mistiming of power circuit head end and end;
The S300 distance obtained in described actual fault point and described physical fault section between selected simulated failure point accounts for the ratio of the line length of described physical fault section;
S400 determines the accurate location of actual fault point according to the position of each shaft tower or cable splice in described ratio and described physical fault section.
Concrete, at the two ends of power circuit, fault traveling wave harvester is installed, when power circuit is actual break down time, the fault traveling wave arrival power circuit head end of actual fault point generation and the mistiming of line end is gathered by fault traveling wave harvester, search in reference row ripple time difference array according to this mistiming, judge physical fault section; Wherein, reference row ripple time difference array comprises the fault traveling wave that each simulated failure point produces and is transferred to mistiming of power circuit means and end.In a kind of embodiment, reference row ripple time difference array obtains by the following method:
At several diverse locations of power circuit, simulated failure point is set;
The fault traveling wave testing the generation of each simulated failure point is successively transferred to the mistiming of power circuit head end and end, builds reference row ripple time difference array.
Wherein, simulated failure point can be arranged as required, preferably, can arrange simulated failure point respectively at the take-off point of power circuit head end, overhead transmission line and cable line junction, overhead transmission line or cable line, power circuit end.And when the fault traveling wave testing the generation of each simulated failure point is transferred to the mistiming of power circuit head end and end, testing method or emulation test method can be adopted.
In a kind of embodiment, if the mistiming that the fault traveling wave that actual fault point produces arrives power circuit head end and line end was between certain two mistiming in reference row ripple time difference array, can determine that the section that this simulated failure point corresponding to two mistimings is formed is physical fault section.Such as, the fault traveling wave that actual fault point produces arrives the mistiming 29.9 μ s (microsecond) of power circuit head end and line end, and in reference row ripple time difference array, simulated failure point M
3the mistiming that the fault traveling wave produced arrives power circuit head end and line end is-29.3 μ s, simulated failure point M
4the mistiming that the fault traveling wave produced arrives power circuit head end and line end is-5.1 μ s, simulated failure point M
5the mistiming that the fault traveling wave produced arrives power circuit head end and line end is 58.9 μ s, due to-5.1<29.9<58.9, therefore can determine that the physical fault section residing for actual fault point is simulated failure point M
4with simulated failure point M
5the section M formed
4m
5.
After determining physical fault section, the distance that can calculate in actual fault point and physical fault section between selected simulated failure point accounts for the ratio of the line length of physical fault section, wherein selected simulated failure point refers to any one in physical fault section simulated failure point of presetting, the head end of such as physical fault section or end.After the distance obtained in actual fault point and physical fault section between selected simulated failure point accounts for the ratio of the line length of physical fault section, the accurate location of actual fault point can be determined according to the position of each shaft tower or cable splice in this ratio and physical fault section.
Be described below in conjunction with an instantiation.
Fig. 2 is the structural representation implementing certain 35kV cable-aerial blended electric power circuit of the present invention.Respectively at power circuit two ends M
1, M
6fault traveling wave harvester is installed at place, and then arrange 6 simulated failure points at power circuit diverse location, simulated failure point is set to respectively in this example: the head end M of power circuit
1, power circuit terminal M
6(in actual power line road M
1, M
6for Bulk Supply Substation), overhead transmission line and cable line junction M
2, M
3, M
4, M
5.Test fault traveling wave when each simulated failure point breaks down by emulation test method successively and arrive the mistiming of power circuit head end and end, wherein fault condition is phase voltage 20207V, stake resistance 200 Ω, fault initial phase angle be 90 °, sample frequency is 10MHz, and it is as shown in table 1 that the capable ripple of fault traveling wave harvester record trouble arrives the power circuit two ends moment.
Table 1
The time that fault traveling wave signal arrives power circuit head end and end measured by the fault traveling wave harvester that power circuit two ends are installed, and then computing time is poor, hypothetical simulation trouble spot M
mthe mistiming that the fault traveling wave produced is transferred to power circuit first and end is Δ T
m, then the mistiming that the fault traveling wave that each simulated failure point produces is transferred to power circuit head end and end is as shown in table 2.
Table 2
Reference row ripple time difference array is built by the number order of simulated failure point:
H＝(ΔT
1,ΔT
2,ΔT
3,ΔT
4,ΔT
5,ΔT
6)＝(-92.9,-64.3,-29.3,-5.1,58.9,92.9)
As shown in Figure 2, now M on power circuit is supposed
4with M
5between f point occur cable local discharge, namely actual fault point is f, power circuit head end M
1locate the voltage traveling wave waveform of fault traveling wave harvester record as shown in Figure 3, power circuit terminal M
6shown in the voltage traveling wave oscillogram 4 of place's fault traveling wave harvester record, then determine that initial wavefront arrives power circuit two ends M
1, M
6the moment at place is respectively 61.4 μ s, 31.5 μ s, then the mistiming that can calculate the fault traveling wave arrival circuit first and end that actual fault point f produces is Δ T
f=29.9 μ s.
Relatively Δ T
fwith the size of element each in array H, as shown in Table 2, Δ T
4< Δ T
f< Δ T
5, then can judge that physical fault occurs in power circuit simulated failure point M
4with M
5the line segment be connected, namely judges that physical fault section is as M
4with M
5the line segment M be connected
4m
5.Then actual fault point f and physical fault section M is calculated
4m
5in distance between selected simulated failure point account for the ratio of the line length of physical fault section.Suppose that in this example, selected simulated failure point is M
4, then only actual fault point f and simulated failure point M need be calculated
4distance account for physical fault section M
4m
5the ratio Y of total line length.
In Fig. 2, when f point breaks down, according to the path of fault traveling wave along power line transmission to power circuit two ends, initial wavefront arrives simulated failure point M
4moment T
4for:
Initial wavefront arrives simulated failure point M
5moment T
5for:
Trouble spot f to M
4the distance l at place
f4for:
In above formula: l
45for M
4with M
5between distance, v is traveling wave speed.
Comprehensive above various, abbreviation can obtain:
Then actual fault point f and simulated failure point M
4distance account for physical fault section M
4m
5the ratio Y of total line length and power circuit length and traveling wave speed all irrelevant.Corresponding data is substituted into above formula, actual fault point and simulated failure point M can be obtained
4distance account for the ratio Y=0.547 of physical fault section total length.
In actual electric network, power circuit length is the line segment length sum between each shaft tower or cable splice, the ratio of the line length of physical fault section is accounted for according to the distance of selected simulated failure point in the particular location of shaft tower each in physical fault section or cable splice and actual fault point to physical fault section, the shaft tower near actual fault point or cable splice can be determined, accurately can locate actual fault point.
In a kind of embodiment, determine the accurate location of actual fault point according to the position of each shaft tower or cable splice in aforementioned proportion Y and physical fault section, realize by following method:
Obtain the length accounting of each shaft tower or cable splice in physical fault section; Described length accounting is that in physical fault section, each shaft tower or cable splice account for the ratio of the line length of physical fault section to the distance selecting simulated failure point;
According to described length accounting, and the distance in actual fault point and physical fault section between selected simulated failure point accounts for the ratio of the line length of physical fault section, determines the accurate location of actual fault point.
Immediately above-mentioned example, supposes position and the selected simulated failure point M of each cable splice in physical fault section
4distance and length accounting as shown in table 3.
Table 3
Actual fault point f and simulated failure point M in Fig. 2
4distance account for physical fault section M
4m
5the ratio Y=0.547 of line length, must be No. 11 joints from the cable splice that actual fault point f is nearest by table 3, and cable line fault usually occurs in cable splice place, therefore can judge that the position of cable local discharge is No. 11 cable splice places, positioning result is accurate.
Comprehensive above content, can find out that the principle of the invention is simple, without the need to measuring power circuit length and traveling wave speed, localization of fault result is not by the impact of power circuit sag, be easy to Project Realization, algorithm of the present invention is simple, practical, positioning precision is high, can get rid of and provide foundation more accurately, have broad application prospects for feeder line fault.
The present invention also provides a kind of feeder line fault travelling wave positioning system, as shown in Figure 5, comprising:
Fault traveling wave mistiming acquisition module 100, for power circuit is actual break down time, obtain the mistiming that fault traveling wave that actual fault point produces arrives power circuit head end and line end;
Fault section determination module 200, arrives mistiming of power circuit head end and end for the fault traveling wave that produces according to described actual fault point and reference row ripple time difference array judges physical fault section; Described reference row ripple time difference array comprises the fault traveling wave that simulated failure point produces and is transferred to mistiming of power circuit head end and end;
Ratio acquisition module 300, accounts for the ratio of the line length of described physical fault section for the distance obtained in described actual fault point and described physical fault section between selected simulated failure point;
Locating module 400, for determining the accurate location of actual fault point according to the position of each shaft tower or cable splice in described ratio and described physical fault section.
Concrete, when power circuit is actual break down time, fault traveling wave mistiming acquisition module 100 gathers the fault traveling wave arrival power circuit head end of actual fault point generation and the mistiming of line end, then fault section determination module 200 was searched in reference row ripple time difference array according to this mistiming, judged physical fault section; Wherein, reference row ripple time difference array comprises the fault traveling wave that each simulated failure point produces and is transferred to mistiming of power circuit means and end.As shown in Figure 5, for generating this reference row ripple time difference array, in a kind of embodiment, feeder line fault travelling wave positioning system of the present invention also comprises time difference array acquisition module 500, for obtaining described reference row ripple time difference array.
Time difference array acquisition module 500 comprises:
Trouble spot arranges module 501, for arranging simulated failure point at several diverse locations of power circuit;
Build module 502, the fault traveling wave produced for obtaining each simulated failure point is transferred to the mistiming of power circuit head end and end, and builds described reference row ripple time difference array.
Wherein, trouble spot arranges module 501 and can arrange as required when arranging simulated failure point, preferably, simulated failure point can be set respectively at the take-off point of power circuit head end, overhead transmission line and cable line junction, overhead transmission line or cable line, power circuit end.After the fault traveling wave adopting testing method or emulation test method to test out the generation of each simulated failure point is transferred to the mistiming of power circuit head end and end, builds module 502 and can construct reference row ripple time difference array.
In a kind of embodiment, if the mistiming that the fault traveling wave that actual fault point produces arrives power circuit head end and line end is between certain two mistiming in reference row ripple time difference array, fault section determination module 200 can determine that the section that this simulated failure point corresponding to two mistimings is formed is physical fault section.Such as, fault traveling wave mistiming acquisition module 100 collects the fault traveling wave arrival power circuit head end of actual fault point generation and the mistiming 29.9 μ s of line end, and in reference row ripple time difference array, simulated failure point M
3the mistiming that the fault traveling wave produced arrives power circuit head end and line end is-29.3 μ s, simulated failure point M
4the mistiming that the fault traveling wave produced arrives power circuit head end and line end is-5.1 μ s, simulated failure point M
5the mistiming that the fault traveling wave produced arrives power circuit head end and line end is 58.9 μ s, due to-5.1<29.9<58.9, therefore fault section determination module 200 can determine that the physical fault section residing for actual fault point is simulated failure point M
4with simulated failure point M
5the section M formed
4m
5.
After determining physical fault section, ratio acquisition module 300 distance that can to calculate in actual fault point and physical fault section between selected simulated failure point accounts for the ratio of the line length of physical fault section, and wherein selected simulated failure point refers to any one in physical fault section simulated failure point of presetting.It is all irrelevant that the distance of actual fault point and selected simulated failure point accounts for the ratio of physical fault section total line length and power circuit length and traveling wave speed.How to calculate described ratio as ratio acquisition module 400, then the computing method that can provide with reference to above-mentioned feeder line fault travelling wave positioning method EXAMPLEPART, repeat no more herein.
In actual electric network, power circuit length is the line segment length sum between each shaft tower or cable splice, locating module 400 accounts for the ratio of the line length of physical fault section according to the distance of simulated failure point selected in the particular location of shaft tower each in physical fault section or cable splice and actual fault point to physical fault section, the shaft tower near actual fault point or cable splice can be determined, accurately can locate actual fault point.
In a kind of embodiment, as shown in Figure 6, locating module 400 comprises:
Length accounting acquisition module 401, for obtaining the length accounting of each shaft tower or cable splice in described physical fault section; Described length accounting is the ratio that in described physical fault section, each shaft tower or cable splice account for the line length of described physical fault section to the distance of described selected simulated failure point;
Trouble spot determination module 402, for according to described length accounting, and the distance in described actual fault point and described physical fault section between selected simulated failure point accounts for the ratio of the line length of described physical fault section, determines the accurate location of described actual fault point.
The realization of above its concrete function of modules, can refer to the method that above-mentioned feeder line fault travelling wave positioning method EXAMPLEPART provides, all repeats no longer one by one herein.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this instructions is recorded.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (9)
1. a feeder line fault travelling wave positioning method, is characterized in that, comprises the steps:
When power circuit is actual break down time, obtain the mistiming that fault traveling wave that actual fault point produces arrives power circuit head end and line end;
The fault traveling wave produced according to described actual fault point arrives mistiming of power circuit head end and end and reference row ripple time difference array judges physical fault section; Described reference row ripple time difference array comprises the fault traveling wave that simulated failure point produces and is transferred to mistiming of power circuit head end and end;
The distance obtained in described actual fault point and described physical fault section between selected simulated failure point accounts for the ratio of the line length of described physical fault section;
The accurate location of actual fault point is determined according to the position of each shaft tower or cable splice in described ratio and described physical fault section.
2. feeder line fault travelling wave positioning method according to claim 1, is characterized in that, described reference row ripple time difference array obtains as follows:
At several diverse locations of power circuit, simulated failure point is set;
The fault traveling wave obtaining the generation of each simulated failure point is transferred to the mistiming of power circuit head end and end, builds described reference row ripple time difference array.
3. feeder line fault travelling wave positioning method according to claim 2, is characterized in that, when the fault traveling wave testing the generation of each simulated failure point is transferred to the mistiming of power circuit head end and end, adopts testing method or emulation test method.
4. the feeder line fault travelling wave positioning method according to Claims 2 or 3, is characterized in that, the process arranging simulated failure point at several diverse locations of power circuit comprises the steps:
At the take-off point of power circuit head end, overhead transmission line and cable line junction, overhead transmission line or cable line, power circuit end, simulated failure point is set respectively.
5. feeder line fault travelling wave positioning method according to any one of claim 1 to 3, it is characterized in that, determine that the process of the accurate location of actual fault point comprises the steps: according to the position of each shaft tower or cable splice in described ratio and described physical fault section
Obtain the length accounting of each shaft tower or cable splice in described physical fault section; Described length accounting is the ratio that in described physical fault section, each shaft tower or cable splice account for the line length of described physical fault section to the distance of described selected simulated failure point;
According to described length accounting, and the distance in described actual fault point and described physical fault section between selected simulated failure point accounts for the ratio of the line length of described physical fault section, determines the accurate location of described actual fault point.
6. a feeder line fault travelling wave positioning system, is characterized in that, comprising:
Fault traveling wave mistiming acquisition module, for power circuit is actual break down time, obtain the mistiming that fault traveling wave that actual fault point produces arrives power circuit head end and line end;
Fault section determination module, arrives mistiming of power circuit head end and end for the fault traveling wave that produces according to described actual fault point and reference row ripple time difference array judges physical fault section; Described reference row ripple time difference array comprises the fault traveling wave that simulated failure point produces and is transferred to mistiming of power circuit head end and end;
Ratio acquisition module, accounts for the ratio of the line length of described physical fault section for the distance obtained in described actual fault point and described physical fault section between selected simulated failure point;
Locating module, for determining the accurate location of actual fault point according to the position of each shaft tower or cable splice in described ratio and described physical fault section.
7. feeder line fault travelling wave positioning system according to claim 6, is characterized in that, also comprises time difference array acquisition module, for obtaining described reference row ripple time difference array; Described time difference array acquisition module comprises:
Trouble spot arranges module, for arranging simulated failure point at several diverse locations of power circuit;
Build module, the fault traveling wave produced for obtaining each simulated failure point is transferred to the mistiming of power circuit head end and end, and builds described reference row ripple time difference array.
8. feeder line fault travelling wave positioning system according to claim 7, it is characterized in that, described trouble spot arranges module and arranges simulated failure point respectively at the take-off point of power circuit head end, overhead transmission line and cable line junction, overhead transmission line or cable line, power circuit end.
9. the feeder line fault travelling wave positioning system according to any one of claim 6 to 8, is characterized in that, described locating module comprises:
Length accounting acquisition module, for obtaining the length accounting of each shaft tower or cable splice in described physical fault section; Described length accounting is the ratio that in described physical fault section, each shaft tower or cable splice account for the line length of described physical fault section to the distance of described selected simulated failure point;
Trouble spot determination module, for according to described length accounting, and the distance in described actual fault point and described physical fault section between selected simulated failure point accounts for the ratio of the line length of described physical fault section, determines the accurate location of described actual fault point.
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| CN105137289A (en) * | 2015-09-16 | 2015-12-09 | 广东电网有限责任公司电力科学研究院 | Traveling wave fault locating method suitable for high-voltage overhead line-cable hybrid line |
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| CN110501607A (en) * | 2018-05-17 | 2019-11-26 | 云南电网有限责任公司曲靖供电局 | A kind of distribution line both-end traveling wave fault positioning method |
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| CN113092946A (en) * | 2021-04-20 | 2021-07-09 | 国网北京市电力公司 | Method and device for positioning ground fault of multi-branch overhead-cable mixed line of power distribution network |
| CN113376486A (en) * | 2021-06-18 | 2021-09-10 | 广东电网有限责任公司广州供电局 | Cable end discharge fault positioning method and device |
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