CN109212384B - A kind of power transmission line fault locating method based on traveling wave amplitude attenuation theory - Google Patents
A kind of power transmission line fault locating method based on traveling wave amplitude attenuation theory 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
A kind of power transmission line fault locating method based on traveling wave amplitude attenuation theory provided by the invention, failure point of power transmission line is judged using the principle that exponentially property constantly decays of amplitude in traveling wave on the line communication process, method is easy, make route traveling wave monitoring device overall simplification, feasibility is higher, and Fault Locating Method is simple, is easy to calculate and verify.
Description
Technical field
The present invention relates to transmission line fault location technology fields more particularly to a kind of theoretical based on traveling wave amplitude attenuation
Power transmission line fault locating method.
Background technique
Line fault traveling wave positioning at present is divided into that traveling wave is single-ended or both-end positioning mode, and single-ended method is according to fault point traveling wave first
The propagation speed of the time and traveling wave of device on the line is reached after the secondary time for reaching route upgoing wave positioning device and reflection
Spend calculate fault point to traveling wave positioning device distance, since catadioptric situation is more multiple at characteristic impedance variation for traveling wave
It is miscellaneous, under many line constructions and fault condition, it can not use；Both-end method reaches fault point both ends according to line fault point traveling wave
The spread speed of the time and traveling wave of route upgoing wave positioning device on the line calculates position of failure point, due to bus two
The traveling wave of first arrival is all only detected at end, influence caused by line transition resistance, system operation mode, distribution capacity etc. compared with
It is small, thus be widely adopted.
The positioning of traveling wave both-end needs the accurate absolute moment for obtaining wavefront, therefore traveling wave both-end positioning device is usually adopted
With high-precision GPS clock, precision needs to reach within 100ns, however since the transient state travelling wave that fault point generates is approximately tool
There is the step signal of continuous frequency spectrum, high fdrequency component speed therein is fast, and low frequency component speed is slow, so that high fdrequency component first reaches survey
Point is measured, measurement point is reached after low frequency component, brings difficulty to the Accurate Calibration of wavefront arrival time, furthermore GPS clock
Accurate clock synchronization causes algorithm complicated, and calculating is at high cost, realizes difficulty, and applicability is not strong, and traveling wave positioning device is mounted with high-precision
GPS module not only power consumption increases, and complicate apparatus system, greatly increase the weight and dimension of traveling wave both-end positioning device
Protect cost.
Summary of the invention
The purpose of the present invention is to provide a kind of power transmission line fault locating method based on traveling wave amplitude attenuation theory, with
Solve the problems mentioned above in the background art.
The present invention is achieved by the following technical solutions: a kind of transmission line malfunction based on traveling wave amplitude attenuation theory
Localization method, which is characterized in that using the amplitude principle pair that exponentially property constantly decays in traveling wave on the line communication process
Failure point of power transmission line judged, specific steps are as follows:
Traveling wave monitoring device, while any position on the transmission line is arranged in S1, the substation at transmission line of electricity both ends
Traveling wave monitoring device is set；
S2, when breaking down, compare the traveling wave monitoring device at transmission line of electricity both ends and the traveling wave prison of intermediate any position
The main wave head polarity of measurement equipment traveling wave circuit collected obtains fault section, the method for obtaining fault section are as follows: by power transmission line
Any position is considered as B point among road, passes through the traveling wave electricity at the transmission line of electricity both ends that the traveling wave monitoring device at transmission line of electricity both ends obtains
Polarity is flowed, the travelling wave current polarity of B point is obtained by the traveling wave monitoring device of transmission line of electricity B point, to transmission line of electricity both ends traveling wave
Current polarity and transmission line of electricity B point travelling wave current polarity are compared, and the opposite endpoint of polarity are considered as A point, by pole
The positive and negative identical endpoint of property is considered as C point, and polarity fault section is AB sections；
S3, physical distance between the traveling wave monitoring device at the transmission line of electricity both ends is obtained, obtains the transmission line of electricity
Physical distance among the traveling wave monitoring device and transmission line of electricity of either end between the traveling wave monitoring device of any position；
S4, it is acquired among traveling wave monitoring device traveling wave amplitude detected and the transmission line of electricity at transmission line of electricity both ends respectively
The traveling wave monitoring device of position traveling wave amplitude detected obtains the traveling wave amplitude expression M of A pointA, obtain the traveling wave width of B point
Value expression MB, obtain the traveling wave amplitude expression M of C pointC；
S5, according on transmission line of electricity between two sections of traveling wave monitoring devices physical distance and the transmission line of electricity it is any
The physical distance of the traveling wave monitoring device of any position, route both ends acquire among the traveling wave monitoring device and transmission line of electricity at end
Fault traveling wave amplitude expression and main wave head polarity, calculate the position of fault point.
Preferably, in step S4, the traveling wave monitoring device at transmission line of electricity both ends traveling wave amplitude detected is A, C
Two o'clock traveling wave amplitude detected, the traveling wave amplitude expression of A, C two o'clock are respectively as follows:
MA=M*e-β(X)
MC=M*e-β(L-X)
In formula, M is fault point traveling wave amplitude size, and physical distance between L A, C two o'clock, β is traveling wave amplitude attenuation speed
Degree, e-β(X)For the attenuation coefficient of A point, e-β(L-X)For the attenuation coefficient of C point, X is distance of the fault point to traveling wave measurement point A.
Preferably, in step S4, the amplitude of the traveling wave monitoring device traveling wave collected in the transmission line of electricity middle position
As B point traveling wave amplitude detected, the traveling wave amplitude expression of B point are as follows:
In formula, M is fault point traveling wave amplitude size, LABPhysical distance between A, B, β are traveling wave amplitude attenuation speed,For the attenuation coefficient of B point, X is distance of the fault point to traveling wave measurement point A.
Preferably, according to 3 points of A, B, C of traveling wave amplitude expression, it can get the expression of fault point and A point distance X
Formula, specifically:
In formula, physical distance between L A, C two o'clock, LABPhysical distance between A, B, MAFor the traveling wave amplitude of A point
Expression formula, MBFor the traveling wave amplitude expression of B point, MCFor the traveling wave amplitude expression of C point.
Compared with prior art, what the present invention reached has the beneficial effect that:
A kind of power transmission line fault locating method based on traveling wave amplitude attenuation theory provided by the invention, does not need high-precision
The traveling wave acquisition time of degree is detached from demand of the transmission tower monitoring device to GPS module, is propagated through using fault traveling wave in route
The amplitude rule that exponentially property decays in journey acquires travelling wave current at route both ends and intermediate any point, is sentenced with wave head polarity
After disconnected fault section, position of failure point can be calculated using only 3 monitoring point traveling wave amplitudes, method is easy, makes route traveling wave
Monitoring device overall simplification, feasibility is higher, and Fault Locating Method is simple, is easy to calculate and verify.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only the preferred embodiment of the present invention, for
For those of ordinary skill in the art, without any creative labor, it can also be obtained according to these attached drawings
His attached drawing.
Fig. 1 is a kind of process of the power transmission line fault locating method based on traveling wave amplitude attenuation theory provided by the invention
Figure；
Fig. 2 is transmission line malfunction simulation model schematic diagram disclosed in the embodiment of the present invention；
The main wave wave head waveform diagram that Fig. 3 is 3 points of A, B, C disclosed in the embodiment of the present invention.
Specific embodiment
In order to be best understood from the technology of the present invention content, be provided below specific embodiment, and in conjunction with attached drawing to the present invention do into
The explanation of one step.
Referring to Fig. 1, a kind of power transmission line fault locating method based on traveling wave amplitude attenuation theory is online using traveling wave
The amplitude principle that exponentially property constantly decays judges failure point of power transmission line in the communication process of road, specific steps are as follows:
S1, the substation at transmission line of electricity both ends are arranged traveling wave monitoring device, while also setting in transmission line of electricity any position
Set traveling wave monitoring device；
S2, when breaking down, compare the traveling wave monitoring device at transmission line of electricity both ends and the traveling wave prison of intermediate any position
The main wave head polarity of measurement equipment traveling wave circuit collected obtains fault section, and specific method is line failure, failure
Point generates transient state travelling wave, propagates to route two sides, then transmission line of electricity any position traveling wave monitoring device and transmission line of electricity both ends row
Wave monitoring device can collect fault traveling wave electric current, and transmission line of electricity any position is considered as B point, passes through transmission line of electricity both ends
Traveling wave monitoring device obtains travelling wave current polarity, obtains travelling wave current polarity by the traveling wave monitoring device of transmission line of electricity B point, right
Transmission line of electricity both ends travelling wave current polarity and transmission line of electricity B point travelling wave current polarity are compared, and specifically more above-mentioned 3 points
Polarity, the opposite endpoint of polarity is considered as A point, the identical endpoint of polarity is considered as C point, by polarity failure
Section is AB sections, and AB sections are fault section；
S3, physical distance between the traveling wave monitoring device at the transmission line of electricity both ends, i.e. the distance between A, C are obtained,
In one embodiment of the invention, the distance between A, C are 15Km, and the traveling wave monitoring for obtaining the transmission line of electricity either end is set
The standby physical distance with the traveling wave monitoring device of any position among transmission line of electricity, i.e. the distance between A, B.
S4, it is acquired among traveling wave monitoring device traveling wave amplitude detected and the transmission line of electricity at transmission line of electricity both ends respectively
The traveling wave monitoring device of position traveling wave amplitude detected, specific method are that exponentially property declines on the line according to traveling wave amplitude
The theory subtracted, if traveling wave amplitude attenuation speed is β, then its attenuation coefficient α=e-βL, wherein L is fault point to traveling wave measurement point
Distance, if fault point traveling wave amplitude is M0, then the traveling wave amplitude M at following equation calculating measurement point L can be used:
M=M0*e-β(L)
So in the present embodiment, following equation can be used to 3 points of A, B, C and express traveling wave amplitude:
MA=M*e-β(X)
MC=M*e-β(L-X)
In formula, M is fault point traveling wave amplitude size, physical distance between L A, C two o'clock, LABPhysics between A, B
Distance, β are traveling wave amplitude attenuation speed, e-β(x)For the attenuation coefficient of A point,For the attenuation coefficient of B point, e-β(L-X)For the attenuation coefficient of C point, X is distance of the fault point to traveling wave measurement point.
S5, according on transmission line of electricity between two sections of traveling wave monitoring devices physical distance and the transmission line of electricity it is any
The physical distance of the traveling wave monitoring device of any position and the acquisition of route both ends among the traveling wave monitoring device and transmission line of electricity at end
Fault traveling wave amplitude size and main wave head polarity, obtain fault point to traveling wave measurement point distance X expression formula, specific table
Up to formula are as follows:
In formula, physical distance between L A, C two o'clock, LABPhysical distance between A, B, MAFor the traveling wave amplitude of A point,
MBFor the traveling wave amplitude of B point, MCFor the traveling wave amplitude of C point, X is fault point at a distance from A point.
In order to verify accuracy of the invention, transmission line malfunction simulation model as shown in Figure 2 is established, 15km line is chosen
Road, both ends A, C point, in the line between take at distance A point 10km a little for B, one traveling wave of injection distance A point 1.6km between AB
Signal M collects 3 points of A, B, C of main wave wave head waveform as shown in figure 3, B point and the main wave wave head polarity phase of A point as seen from Figure 2
Instead, B point is identical as the main wave wave head polarity of C point, meets the judgement in step S2 to fault section.
3 points of A, B, C traveling wave amplitudes detected are obtained, obtained the results are shown in Table 1:
1 traveling wave amplitude result of table
| Test point | Traveling wave amplitude |
| A | 458.7133 |
| B | 417.5499 |
| C | 389.5027 |
According to 3 points of A, B, C of traveling wave amplitude expression in step S4, the fault point in step S5 and A point are calculated
The expression formula of distance X brings the data of table 1 into fault point in the expression formula of A point distance X, X=1.6196Km can be obtained,
Compared with physical fault distance, relative error 1.2%, absolute error reaches transmission line malfunction accurate positioning and wants in 20m
It asks.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the present invention.
Claims (3)
1. a kind of power transmission line fault locating method based on traveling wave amplitude attenuation theory, which is characterized in that exist using traveling wave
The amplitude principle that exponentially property constantly decays judges failure point of power transmission line during propagating on route, specific steps
Are as follows:
Traveling wave monitoring device is arranged in S1, the substation at transmission line of electricity both ends, while any position is also provided on the transmission line
Traveling wave monitoring device；
S2, when breaking down, the traveling wave monitoring for comparing the traveling wave monitoring device and intermediate any position at transmission line of electricity both ends is set
The main wave head polarity of standby travelling wave current collected, obtains fault section, the method for obtaining fault section are as follows: will be in transmission line of electricity
Between any position be considered as B point, pass through the travelling wave current pole at the transmission line of electricity both ends that the traveling wave monitoring device at transmission line of electricity both ends obtains
Property, the travelling wave current polarity of B point is obtained by the traveling wave monitoring device of transmission line of electricity B point, to transmission line of electricity both ends travelling wave current
Polarity and transmission line of electricity B point travelling wave current polarity are compared, and the opposite endpoint of polarity are considered as A point, just by polarity
It bears identical endpoint and is considered as C point, polarity fault section is AB sections；
S3, physical distance between the traveling wave monitoring device at the transmission line of electricity both ends is obtained, it is any obtains the transmission line of electricity
Physical distance among the traveling wave monitoring device and transmission line of electricity at end between the traveling wave monitoring device of any position；
S4, traveling wave monitoring device traveling wave amplitude detected and the transmission line of electricity middle position for acquiring transmission line of electricity both ends respectively
Traveling wave monitoring device traveling wave amplitude detected, obtain A point traveling wave amplitude expression MA, obtain the traveling wave amplitude table of B point
Up to formula MB, obtain the traveling wave amplitude expression M of C pointC；
S5, according to the physical distance and the transmission line of electricity either end on transmission line of electricity between both ends traveling wave monitoring device
The physical distance of the traveling wave monitoring device of any position, the failure of route both ends acquisition among traveling wave monitoring device and transmission line of electricity
Traveling wave amplitude expression and main wave head polarity calculate fault point at a distance from A point, specific calculation are as follows:
In formula, X is fault point at a distance from A point, physical distance between L A, C two o'clock, LABPhysical distance between A, B, MA
For the traveling wave amplitude expression of A point, MBFor the traveling wave amplitude expression of B point, MCFor the traveling wave amplitude expression of C point.
2. a kind of power transmission line fault locating method based on traveling wave amplitude attenuation theory according to claim 1, special
Sign is, in step S4, the traveling wave monitoring device at transmission line of electricity both ends traveling wave amplitude detected is that A, C two o'clock are examined
The traveling wave amplitude expression of the traveling wave amplitude of survey, A, C two o'clock is respectively as follows:
MA=M*e-β(X)
MC=M*e-β(L-X)
In formula, M is fault point traveling wave amplitude size, and physical distance between L A, C two o'clock, β is traveling wave amplitude attenuation speed, e-β(X)For the attenuation coefficient of A point, e-β(L-X)For the attenuation coefficient of C point, X is distance of the fault point to traveling wave measurement point A.
3. a kind of power transmission line fault locating method based on traveling wave amplitude attenuation theory according to claim 2, special
Sign is, in step S4, the amplitude of the traveling wave monitoring device traveling wave collected in the transmission line of electricity middle position is B point institute
The traveling wave amplitude of detection, the traveling wave amplitude expression of B point are as follows:
In formula, M is fault point traveling wave amplitude size, LABPhysical distance between A, B, β are traveling wave amplitude attenuation speed,For the attenuation coefficient of B point, X is distance of the fault point to traveling wave measurement point A.
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