CN105974274A - Power transmission line fault location method and system - Google Patents
Power transmission line fault location method and system Download PDFInfo
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- CN105974274A CN105974274A CN201610596873.2A CN201610596873A CN105974274A CN 105974274 A CN105974274 A CN 105974274A CN 201610596873 A CN201610596873 A CN 201610596873A CN 105974274 A CN105974274 A CN 105974274A
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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
- G01R31/088—Aspects of digital computing
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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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Abstract
The invention discloses a power transmission line fault location method. The method comprises the following steps: carrying out first fault location by utilizing line positive-sequence parameters obtained before fault and first transient data of the line obtained after fault to obtain an initial fault location value; calculating line positive-sequence parameters obtained after fault by utilizing the initial location value and second transient data of the line obtained after fault; and carrying out fault location again by utilizing the line positive-sequence parameters obtained after fault and the first transient data to obtain a corrected fault location value. The line positive-sequence parameters obtained before fault and the first transient data of the line obtained after fault are utilized to carry out initial fault location; in order to improve fault location precision, the line positive-sequence parameters obtained after fault are calculated based on the initial fault location value; and then, fault location is carried out again by utilizing the line positive-sequence parameters obtained after fault, which is equivalent to an effect that the initial fault location value is subjected to correction processing, so that higher-precision fault location value can be obtained. Besides, the invention also discloses a power transmission line fault location system.
Description
Technical field
The present invention relates to fault localization technical field, particularly to a kind of fault positioning method for transmission line and system.
Background technology
Measuring distance of transmission line fault is the important component part of relay protection of power system, be one ensure power grid security,
The necessary technology measure of stable operation.Line fault point is carried out in time, positions accurately, beneficially the quick process of fault,
Reduce the economic loss that causes of having a power failure, it is to avoid because having a power failure, social life is adversely affected, have great technology, economy and
Social benefit.
But, the range accuracy of existing fault distance-finding method also cannot fully meet the needs of power generation, range accuracy
Need to be further improved.
In sum it can be seen that promoting fault localization precision the most further is current problem demanding prompt solution.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of fault positioning method for transmission line and system, carry further
Rise fault localization precision.Its concrete scheme is as follows:
A kind of fault positioning method for transmission line, including:
After utilizing the positive order parameter of the circuit before fault and fault, the first Temporal Data of circuit carries out initial fault range finding,
To initial ranging value;Wherein, the propagation coefficient before the positive order parameter of circuit before described fault includes fault and the characteristic before fault
Impedance;
Utilize the second Temporal Data of circuit after described initial ranging value and fault, calculate the circuit positive sequence ginseng after fault
Number;Wherein, the propagation coefficient after the positive order parameter of circuit after described fault includes fault and the characteristic impedance after fault;
Utilize the positive order parameter of the circuit after described fault and described first Temporal Data to carry out fault localization again, repaiied
Fault localization value after just.
Preferably, described utilize fault before the positive order parameter of circuit and fault after the first Temporal Data of circuit carry out for the first time
Fault localization, obtains the process of initial ranging value, including:
Utilize the positive order parameter of the circuit before described fault and described first Temporal Data, default equation is solved,
To described initial ranging value;Wherein, described default equation is:
In formula, γ0Represent the propagation coefficient before described fault, Z0Represent the characteristic impedance before described fault;Represent event
The positive sequence voltage of the delivery end of Fisrt fault loop line after barrier,After expression fault, the delivery end of described Fisrt fault loop line is just
Sequence electric current,The positive sequence voltage of the receiving terminal of described Fisrt fault loop line after expression fault,Represent after fault described first
The forward-order current of the receiving terminal of fault loop line;L represents the total length of described Fisrt fault loop line, x0Represent described initial ranging
Value, ch (*) represents hyperbolic cosine function, and sh (*) represents hyperbolic sine function.
Preferably, described the second Temporal Data of circuit after described initial ranging value and fault is utilized, after calculating fault
The process of the positive order parameter of circuit, including:
Utilize described initial ranging value and described second Temporal Data, the first equation group is solved, obtain described event
The positive order parameter of circuit after barrier;
Wherein, described first equation group includes:
In formula, x0Represent described initial ranging value;The positive sequence of the delivery end of described Fisrt fault loop line after expression fault
Voltage,The forward-order current of the delivery end of described Fisrt fault loop line after expression fault,Described first event after representing fault
The positive sequence voltage of the receiving terminal of barrier loop line,The forward-order current of the receiving terminal of described Fisrt fault loop line after expression fault,
The negative sequence voltage of the delivery end of described Fisrt fault loop line after expression fault,Described Fisrt fault loop line after expression fault
The negative-sequence current of delivery end,The negative sequence voltage of the receiving terminal of described Fisrt fault loop line after expression fault,Represent fault
The negative-sequence current of the receiving terminal of rear described Fisrt fault loop line;γ1Represent the propagation coefficient after described fault, Z1Represent described event
Characteristic impedance after barrier, l represents the total length of described Fisrt fault loop line.
Preferably, described the second Temporal Data of circuit after described initial ranging value and fault is utilized, after calculating fault
The process of the positive order parameter of circuit, including:
Utilize described initial ranging value and described second Temporal Data, the second equation group is solved, obtain described event
The positive order parameter of circuit after barrier;
Wherein, described second equation group includes:
In formula, x0Represent described initial ranging value;The positive sequence of the delivery end of described Fisrt fault loop line after expression fault
Voltage,The forward-order current of the delivery end of described Fisrt fault loop line after expression fault,Described first event after representing fault
The positive sequence voltage of the receiving terminal of barrier loop line,The forward-order current of the receiving terminal of described Fisrt fault loop line after expression fault,
The positive sequence voltage of the delivery end of the second fault loop line after expression fault,The delivery end of described second fault loop line after expression fault
Forward-order current,The positive sequence voltage of the receiving terminal of described second fault loop line after expression fault,Represent described in after fault
The forward-order current of the receiving terminal of the second fault loop line;γ1Represent the propagation coefficient after described fault, Z1After representing described fault
Characteristic impedance, l represents the total length of described Fisrt fault loop line.
Preferably, described fault positioning method for transmission line, also include:
Step S41: judge whether described revised fault localization value meets and preset range accuracy, if it is, by institute
State revised fault localization value and be defined as final fault localization value, if it is not, then enter step S42;
Step S42: described revised fault localization value is defined as the fault localization value treating again to revise;
Step S43: treat the fault localization value again revised and carry out correcting process again, obtain current correction value;
Step S44: judge whether current correction value meets described default range accuracy, if it is not, then by current correction value
It is defined as the fault localization value treating again to revise, and reenters step S43, if it is, current correction value is defined as
Whole fault localization value, and terminate correcting process.
Preferably, treat the fault localization value again revised every time and carry out again the process of correcting process, including:
Utilize the fault localization value and described second Temporal Data treating again to revise, again calculate the circuit positive sequence after fault
Parameter, obtains the positive order parameter of revised circuit;
Utilize the described positive order parameter of revised circuit and described first Temporal Data to carry out fault localization again, obtain phase
The current correction value answered.
The invention also discloses a kind of measuring distance of transmission line fault system, including:
Initial fault range finder module, the first transient state number of circuit after utilizing the positive order parameter of circuit before fault and fault
According to carrying out initial fault range finding, obtain initial ranging value;Wherein, the biography before the positive order parameter of circuit before described fault includes fault
Broadcast the characteristic impedance before coefficient and fault;
Parameter calculating module, the second Temporal Data of circuit after utilizing described initial ranging value and fault, calculate event
The positive order parameter of circuit after barrier;Wherein, after propagation coefficient after the positive order parameter of circuit after described fault includes fault and fault
Characteristic impedance;
Fault localization module again, the positive order parameter of circuit and described first Temporal Data after utilizing described fault enter
Row fault localization again, obtains revised fault localization value.
Preferably, described initial fault range finder module, specifically utilize the positive order parameter of the circuit before described fault and described
One Temporal Data, solves default equation, obtains described initial ranging value;Wherein, described default equation is:
In formula, γ0Represent the propagation coefficient before described fault, Z0Represent the characteristic impedance before described fault;Represent event
The positive sequence voltage of the delivery end of Fisrt fault loop line after barrier,After expression fault, the delivery end of described Fisrt fault loop line is just
Sequence electric current,The positive sequence voltage of the receiving terminal of described Fisrt fault loop line after expression fault,Represent after fault described first
The forward-order current of the receiving terminal of fault loop line;L represents the total length of described Fisrt fault loop line, x0Represent described initial ranging
Value, ch (*) represents hyperbolic cosine function, and sh (*) represents hyperbolic sine function.
Preferably, described parameter calculating module, specifically for utilizing described initial ranging value and described second Temporal Data,
First equation group is solved, obtains the positive order parameter of the circuit after described fault;
Wherein, described first equation group includes:
In formula, x0Represent described initial ranging value;The positive sequence of the delivery end of described Fisrt fault loop line after expression fault
Voltage,The forward-order current of the delivery end of described Fisrt fault loop line after expression fault,Described first event after representing fault
The positive sequence voltage of the receiving terminal of barrier loop line,The forward-order current of the receiving terminal of described Fisrt fault loop line after expression fault,
The negative sequence voltage of the delivery end of described Fisrt fault loop line after expression fault,Described Fisrt fault loop line after expression fault
The negative-sequence current of delivery end,The negative sequence voltage of the receiving terminal of described Fisrt fault loop line after expression fault,Represent fault
The negative-sequence current of the receiving terminal of rear described Fisrt fault loop line;γ1Represent the propagation coefficient after described fault, Z1Represent described event
Characteristic impedance after barrier, l represents the total length of described Fisrt fault loop line.
Preferably, described parameter calculating module, specifically for utilizing described initial ranging value and described second Temporal Data,
Second equation group is solved, obtains the positive order parameter of the circuit after described fault;
Wherein, described second equation group includes:
In formula, x0Represent described initial ranging value;The positive sequence of the delivery end of described Fisrt fault loop line after expression fault
Voltage,The forward-order current of the delivery end of described Fisrt fault loop line after expression fault,Described first event after representing fault
The positive sequence voltage of the receiving terminal of barrier loop line,The forward-order current of the receiving terminal of described Fisrt fault loop line after expression fault,
The positive sequence voltage of the delivery end of the second fault loop line after expression fault,The delivery end of described second fault loop line after expression fault
Forward-order current,The positive sequence voltage of the receiving terminal of described second fault loop line after expression fault,Represent described in after fault
The forward-order current of the receiving terminal of the second fault loop line;γ1Represent the propagation coefficient after described fault, Z1After representing described fault
Characteristic impedance, l represents the total length of described Fisrt fault loop line.
Preferably, measuring distance of transmission line fault system, also include the first precision judge module, correcting module and the second precision
Judge module: described correcting module includes determining submodule and revising submodule;Wherein,
Described first precision judge module, is used for judging whether described revised fault localization value meets and presets range finding essence
Degree, if it is, be defined as final fault localization value, if it is not, then repair described in Chu Faing by described revised fault localization value
Positive module startup work;
Described determine submodule, for described revised fault localization value being defined as the fault localization treating again to revise
Value;
Described correction submodule, for treating that the fault localization value again revised carries out correcting process again, is currently repaiied
On the occasion of;
Described second precision judge module, for judging whether the current correction value that described correcting module obtains meets described
Preset range accuracy, if it is not, then current correction value to be defined as the fault localization value treating again to revise, and trigger described correction
Submodule is again started up work, if it is, current correction value is defined as final fault localization value.
Preferably, described correction submodule includes:
Parameters revision unit, for utilizing the fault localization value and described second Temporal Data treating again to revise, counts again
Calculate the positive order parameter of circuit after fault, obtain the positive order parameter of revised circuit;
Fault localization unit again, is used for utilizing the described positive order parameter of revised circuit and described first Temporal Data to enter
Row fault localization again, obtains corresponding current correction value.
In the present invention, fault positioning method for transmission line, including: utilize line after the positive order parameter of the circuit before fault and fault
First Temporal Data on road carries out initial fault range finding, obtains initial ranging value;Wherein, the positive order parameter of circuit before fault includes
Propagation coefficient before fault and the characteristic impedance before fault;Utilize the second Temporal Data of circuit after initial ranging value and fault,
Calculate the positive order parameter of circuit after fault;Wherein, the propagation coefficient after the positive order parameter of circuit after fault includes fault and fault
After characteristic impedance;Utilize the positive order parameter of the circuit after fault and the first Temporal Data to carry out fault localization again, revised
After fault localization value.Visible, the present invention is first with the first transient state number of circuit after the positive order parameter of the circuit before fault and fault
According to carrying out initial fault range finding, obtain initial ranging value, in order to promote fault localization precision further, the present invention utilize above-mentioned at the beginning of
Beginning distance measurement value calculates the positive order parameter of the circuit after fault, then utilizes the above-mentioned circuit positive sequence ginseng being worth to based on initial ranging
Number carries out fault localization again, and this is equivalent to above-mentioned initial ranging value has been carried out a correcting process, thus obtains precision more
High fault localization value.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to
The accompanying drawing provided obtains other accompanying drawing.
Fig. 1 is a kind of fault positioning method for transmission line flow chart disclosed in the embodiment of the present invention;
Fig. 2 is a kind of measuring distance of transmission line fault system structure schematic diagram disclosed in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
The embodiment of the invention discloses a kind of fault positioning method for transmission line, shown in Figure 1, the method includes:
Step S11: after utilizing the positive order parameter of the circuit before fault and fault, the first Temporal Data of circuit carries out first event
Barrier range finding, obtains initial ranging value;Wherein, the propagation coefficient before the positive order parameter of circuit before above-mentioned fault includes fault and fault
Front characteristic impedance.
That is, the characteristic impedance of the propagation coefficient of transmission line of electricity before utilizing transmission line of electricity to break down, transmission line of electricity with
And the first Temporal Data after fault carries out initial fault range finding, obtain initial ranging value.Wherein, above-mentioned first Temporal Data is
The Temporal Data that transmission line of electricity detects after breaking down, this Temporal Data includes voltage and current data.
It addition, the steady state data of circuit calculates before the positive order parameter of circuit before above-mentioned fault specifically can utilize fault
Arriving, concrete calculating process refers to existing correlation technique, no longer repeats at this.
It should be noted that above-mentioned initial ranging value is temporary on circuit after the positive order parameter of the circuit before fault and fault
Obtain on the basis of state data, owing to the existence of the positive order parameter of the circuit before fault order parameter positive with the circuit after fault is compared bright
Aobvious diversity, so, the initial survey obtained based on the Temporal Data on circuit after the positive order parameter of the circuit before fault and fault
Error away from value is relatively big, needs follow-up through further correcting process.
Step S12: utilize the second Temporal Data of circuit after above-mentioned initial ranging value and fault, calculate the circuit after fault
Positive order parameter;Wherein, the propagation coefficient after the positive order parameter of circuit after above-mentioned fault includes fault and the characteristic impedance after fault.
That is, the second Temporal Data of circuit after utilizing above-mentioned initial ranging value and fault, calculate transmission line of electricity after fault
On propagation coefficient and characteristic impedance it is understood that above-mentioned second Temporal Data and above-mentioned first Temporal Data are fault
After Temporal Data on the transmission line of electricity that detects, all include voltage and current data.
Step S13: utilize the positive order parameter of the circuit after above-mentioned fault and above-mentioned first Temporal Data to carry out again fault and survey
Away from, obtain revised fault localization value.
It should be noted that relative to the positive order parameter of the circuit before fault, owing to the positive order parameter of the circuit after fault can
Fault state on circuit after more laminating fault occurs, so, based on the positive order parameter of the circuit after above-mentioned fault and above-mentioned
The fault localization value that first Temporal Data obtains, compared to above-mentioned based on the positive order parameter of the circuit before fault with above-mentioned first transient state
The initial ranging value that data obtain, has higher degree of accuracy, it can be seen that, the fault localization again in step S13 processes this
It is the correcting process that above-mentioned initial ranging value is carried out in matter, thus obtains precision higher fault localization value.
In the embodiment of the present invention, fault positioning method for transmission line, including: utilize the positive order parameter of the circuit before fault and event
After barrier, the first Temporal Data of circuit carries out initial fault range finding, obtains initial ranging value;Wherein, the circuit positive sequence ginseng before fault
Number includes the propagation coefficient before fault and the characteristic impedance before fault;Utilize the second transient state of circuit after initial ranging value and fault
Data, calculate the positive order parameter of circuit after fault;Wherein, the propagation coefficient after the positive order parameter of circuit after fault includes fault and
Characteristic impedance after fault;Utilize the positive order parameter of the circuit after fault and the first Temporal Data to carry out fault localization again, obtain
Revised fault localization value.Visible, the embodiment of the present invention is first with circuit after the positive order parameter of the circuit before fault and fault
First Temporal Data carries out initial fault range finding, obtains initial ranging value, in order to promote fault localization precision, the present invention further
Embodiment utilizes above-mentioned initial ranging value to calculate the positive order parameter of circuit after fault, then utilizes above-mentioned based on initial ranging value
The positive order parameter of circuit obtained carries out fault localization again, and this is equivalent to above-mentioned initial ranging value has been carried out a Corrections Division
Reason, thus obtain precision higher fault localization value.
The embodiment of the invention discloses a kind of concrete fault positioning method for transmission line, relative to a upper embodiment, this
Technical scheme has been made further instruction and optimization by embodiment.Concrete:
In upper embodiment step S11, utilize the first transient state number of circuit after the positive order parameter of the circuit before fault and fault
According to carrying out initial fault range finding, obtain the process of initial ranging value, including: utilize the positive order parameter of the circuit before fault and first temporary
State data, solve default equation, obtain initial ranging value;Wherein, above-mentioned default equation is:
In formula, γ0Represent the propagation coefficient before fault, Z0Represent the characteristic impedance before fault;Represent after fault first
The positive sequence voltage of the delivery end of fault loop line,The forward-order current of the delivery end of Fisrt fault loop line after expression fault,Table
Show the positive sequence voltage of the receiving terminal of Fisrt fault loop line after fault,The positive sequence of the receiving terminal of Fisrt fault loop line after expression fault
Electric current;L represents the total length of Fisrt fault loop line, x0Representing initial ranging value, ch (*) represents hyperbolic cosine function, sh (*) table
Show hyperbolic sine function.It is understood that the positive order parameter of circuit before above-mentioned fault includes γ0And Z0;Above-mentioned first transient state number
According to including With
It is understood that by simplifying above-mentioned default equation, simplified equation accordingly, then utilizing should
Simplify equation, above-mentioned initial ranging value x can be tried to achieve0.Wherein, this simplification equation is:
Wherein, th (*) represents hyperbolic tangent function.By solving above-mentioned simplification equation, available above-mentioned initial ranging value.
And in upper embodiment step S12, specifically can be respectively adopted two according to two kinds of different situations on transmission line of electricity
Planting different computational methods order parameters positive to the circuit after fault to calculate, wherein, first method is same after a failure
It is applied to above-mentioned in the case of two ends Temporal Data on one fault loop line all exists the bigger positive sequence of amplitude and negative sequence component
In step S12, second method is then that the negative sequence component amplitude in the two ends Temporal Data on arbitrary fault loop line is equal
It is applied in above-mentioned steps S12 in the case of smaller.
More specifically, above-mentioned first method specifically includes: utilize initial ranging value and the second Temporal Data, to first party
Journey group solves, and obtains the positive order parameter of the circuit after fault;
Wherein, the first equation group includes:
In formula, x0Represent initial ranging value;The positive sequence voltage of the delivery end of Fisrt fault loop line after expression fault,
The forward-order current of the delivery end of Fisrt fault loop line after expression fault,The receiving terminal of Fisrt fault loop line after expression fault
Positive sequence voltage,The forward-order current of the receiving terminal of Fisrt fault loop line after expression fault,After representing fault, Fisrt fault returns
The negative sequence voltage of the delivery end of line,The negative-sequence current of the delivery end of Fisrt fault loop line after expression fault,Represent fault
The negative sequence voltage of the receiving terminal of rear Fisrt fault loop line,The negative-sequence current of the receiving terminal of Fisrt fault loop line after expression fault;
γ1Represent the propagation coefficient after fault, Z1Representing the characteristic impedance after fault, l represents the total length of Fisrt fault loop line.Permissible
Being understood by, when above-mentioned first method being applied in step S12, above-mentioned second Temporal Data specifically includes above-mentioned first
In equation groupWithIn above-mentioned first method, by asking
Solve above-mentioned first equation group, γ can be obtained1And Z1。
Concrete, by solving above-mentioned first equation group, can obtain:
Wherein,
γ is being obtained by above-mentioned two formulas1On the basis of, can correspondingly obtain Z based on equation one or equation two1。
It should be noted that above-mentioned equation one and equation two are all the equatioies derived by above-mentioned first equation group.Wherein,
Above-mentioned equation one particularly as follows:
Above-mentioned equation two particularly as follows:
And above-mentioned second method specifically includes: utilize initial ranging value and the second Temporal Data, the second equation group is entered
Row solves, and obtains the positive order parameter of the circuit after fault;
Wherein, the second equation group includes:
In formula, x0Represent initial ranging value;The positive sequence voltage of the delivery end of Fisrt fault loop line after expression fault,
The forward-order current of the delivery end of Fisrt fault loop line after expression fault,The receiving terminal of Fisrt fault loop line after expression fault
Positive sequence voltage,The forward-order current of the receiving terminal of Fisrt fault loop line after expression fault,After representing fault, the second fault is returned
The positive sequence voltage of the delivery end of line,The forward-order current of the delivery end of the second fault loop line after expression fault,Represent fault
The positive sequence voltage of the receiving terminal of rear second fault loop line,The forward-order current of the receiving terminal of the second fault loop line after expression fault;
γ1Represent the propagation coefficient after fault, Z1Representing the characteristic impedance after fault, l represents the total length of Fisrt fault loop line.Permissible
Being understood by, when above-mentioned second method being applied in step S12, above-mentioned second Temporal Data specifically includes above-mentioned second
In equation groupWithIn above-mentioned second method, by asking
Solve above-mentioned second equation group, γ can be obtained1And Z1。
Concrete, by above-mentioned second equation group, and combineWithCan derive following formula:
Wherein,
By above-mentioned two formulas, and the expansion combining Maclaurin series processes, and can obtain γ1, wherein,
Wherein,
Obtaining γ1On the basis of, can correspondingly obtain Z based on equation three1, it should be noted that above-mentioned equation
Three are derived by above-mentioned second equation group.Wherein,
Above-mentioned equation three particularly as follows:
Wherein,
In summary, the two ends Temporal Data on the most same fault loop line all exists the bigger positive sequence of amplitude and
In the case of negative sequence component, above-mentioned first method is applied in above-mentioned steps S12, and two on arbitrary fault loop line
In the case of holding the negative sequence component amplitude in Temporal Data smaller, then above-mentioned second method is applied to above-mentioned steps
In S12.
It addition, in upper embodiment step S13, utilize the positive order parameter of the circuit after above-mentioned fault and above-mentioned first transient state number
According to carrying out fault localization again, obtain the process of revised fault localization value, specifically may include that after utilizing above-mentioned fault
The positive order parameter of circuit and above-mentioned first Temporal Data, solve the default equation after adjusting, and obtains above-mentioned revised event
Barrier distance measurement value.Wherein, default equation after above-mentioned adjustment particularly as follows:
In formula, γ1Represent the propagation coefficient after the fault calculated in above-mentioned steps S12, Z1Represent in above-mentioned steps S12
Characteristic impedance after the fault calculated;The positive sequence voltage of the delivery end of Fisrt fault loop line after expression fault,Represent
The forward-order current of the delivery end of Fisrt fault loop line after fault,The positive sequence of the receiving terminal of Fisrt fault loop line after expression fault
Voltage,The forward-order current of the receiving terminal of Fisrt fault loop line after expression fault;L represents the total length of Fisrt fault loop line, x1
Represent above-mentioned revised fault localization value.It is understood that the positive order parameter of circuit after above-mentioned fault includes γ1And Z1;On
State the first Temporal Data to includeWithIn the present embodiment, by solving the default side after above-mentioned adjustment
Journey, can obtain revised fault localization value x1。
It should be noted that about the solution procedure of the default equation after above-mentioned adjustment refer to aforementioned disclosed at the beginning of
The solution procedure of beginning distance measurement value, no longer repeats at this.
The embodiment of the invention discloses one more specifically fault positioning method for transmission line, relative to a upper embodiment,
Technical scheme has been made further instruction and optimization by the present embodiment.Concrete:
In order to further improve fault localization precision, relative to both of the aforesaid embodiment, the transmission of electricity in the present embodiment
Circuit fault distance measurement, it is also possible to farther include below step S41 to S44;Wherein,
Step S41: judge in previous embodiment step S13, whether revised fault localization value meets default range finding essence
Degree, if it is, be defined as final fault localization value by above-mentioned revised fault localization value, if it is not, then enter step
S42;
Step S42: revised fault localization value is defined as the fault localization value treating again to revise;
Step S43: treat the fault localization value again revised and carry out correcting process again, obtain current correction value;
Step S44: judge whether current correction value meets and preset range accuracy, if it is not, then current correction value determined
For treating the fault localization value again revised, and reenter step S43, if it is, current correction value to be defined as final event
Barrier distance measurement value, and terminate correcting process.
Wherein, in above-mentioned steps S43, treat the fault localization value again revised every time and carry out again the mistake of correcting process
Journey, specifically includes: utilizes the fault localization value and above-mentioned second Temporal Data treating again to revise, again calculates the circuit after fault
Positive order parameter, obtains the positive order parameter of revised circuit, then utilizes this positive order parameter of revised circuit and above-mentioned first temporary
State data carry out fault localization again, obtain corresponding current correction value.
It should be noted that above-mentioned default range accuracy can be required have by technical staff according to actual range accuracy
Body is arranged, and does not specifically limit it at this.
It is understood that the fault localization value again revised and above-mentioned second Temporal Data are treated in above-mentioned utilization, again count
Calculate the process of the positive order parameter of circuit after fault, refer in previous embodiment disclosed first method or the second side
Method, no longer repeats at this.In like manner, above-mentioned this positive order parameter of revised circuit and above-mentioned first Temporal Data is utilized to carry out
The process of fault localization again, it is possible to reference to the solution procedure of disclosed initial ranging value in previous embodiment, at this not
Repeat again.
Accordingly, the embodiment of the invention also discloses a kind of measuring distance of transmission line fault system, shown in Figure 2, this is
System includes:
Initial fault range finder module 21, the first transient state of circuit after utilizing the positive order parameter of circuit before fault and fault
Data carry out initial fault range finding, obtain initial ranging value;Wherein, before the positive order parameter of circuit before above-mentioned fault includes fault
Characteristic impedance before propagation coefficient and fault;
Parameter calculating module 22, the second Temporal Data of circuit after utilizing above-mentioned initial ranging value and fault, calculate
The positive order parameter of circuit after fault;Wherein, the propagation coefficient after the positive order parameter of circuit after above-mentioned fault includes fault and fault
After characteristic impedance;
Fault localization module 23 again, the positive order parameter of circuit after utilizing above-mentioned fault and above-mentioned first Temporal Data
Carry out fault localization again, obtain revised fault localization value.
Visible, the embodiment of the present invention is first with the first Temporal Data of circuit after the positive order parameter of the circuit before fault and fault
Carry out initial fault range finding, obtain initial ranging value, in order to promote fault localization precision further, in embodiment of the present invention utilization
State initial ranging value to calculate the positive order parameter of circuit after fault, just then utilize the above-mentioned circuit being worth to based on initial ranging
Order parameter carries out fault localization again, and this is equivalent to above-mentioned initial ranging value has been carried out a correcting process, thus obtains essence
Spend higher fault localization value.
Concrete, above-mentioned initial fault range finder module, the positive order parameter of circuit before available fault and the first Temporal Data,
Default equation is solved, obtains initial ranging value;Wherein, default equation is:
In formula, γ0Represent the propagation coefficient before fault, Z0Represent the characteristic impedance before fault;Represent after fault first
The positive sequence voltage of the delivery end of fault loop line,The forward-order current of the delivery end of Fisrt fault loop line after expression fault,Table
Show the positive sequence voltage of the receiving terminal of Fisrt fault loop line after fault,After expression fault, the receiving terminal of Fisrt fault loop line is just
Sequence electric current;L represents the total length of Fisrt fault loop line, x0Representing initial ranging value, ch (*) represents hyperbolic cosine function, sh (*)
Represent hyperbolic sine function.
It addition, all there is the bigger positive sequence of amplitude and negative phase-sequence in two ends Temporal Data on the most same fault loop line
In the case of component, above-mentioned parameter computing module, it is particularly used in and utilizes initial ranging value and the second Temporal Data, to first party
Journey group solves, and obtains the positive order parameter of the circuit after fault;
Wherein, the first equation group includes:
In formula, x0Represent initial ranging value;The positive sequence voltage of the delivery end of Fisrt fault loop line after expression fault,
The forward-order current of the delivery end of Fisrt fault loop line after expression fault,The receiving terminal of Fisrt fault loop line after expression fault
Positive sequence voltage,The forward-order current of the receiving terminal of Fisrt fault loop line after expression fault,After representing fault, Fisrt fault returns
The negative sequence voltage of the delivery end of line,The negative-sequence current of the delivery end of Fisrt fault loop line after expression fault,Represent fault
The negative sequence voltage of the receiving terminal of rear Fisrt fault loop line,The negative-sequence current of the receiving terminal of Fisrt fault loop line after expression fault;
γ1Represent the propagation coefficient after fault, Z1Representing the characteristic impedance after fault, l represents the total length of Fisrt fault loop line.
And in the case of negative sequence component amplitude in the two ends Temporal Data on arbitrary fault loop line is smaller, above-mentioned
Parameter calculating module, is particularly used in and utilizes initial ranging value and the second Temporal Data, solve the second equation group, obtain
The positive order parameter of circuit after fault;
Wherein, the second equation group includes:
In formula, x0Represent initial ranging value;The positive sequence voltage of the delivery end of Fisrt fault loop line after expression fault,
The forward-order current of the delivery end of Fisrt fault loop line after expression fault,The receiving terminal of Fisrt fault loop line after expression fault
Positive sequence voltage,The forward-order current of the receiving terminal of Fisrt fault loop line after expression fault,After representing fault, the second fault is returned
The positive sequence voltage of the delivery end of line,The forward-order current of the delivery end of the second fault loop line after expression fault,Represent fault
The positive sequence voltage of the receiving terminal of rear second fault loop line,The forward-order current of the receiving terminal of the second fault loop line after expression fault;
γ1Represent the propagation coefficient after fault, Z1Representing the characteristic impedance after fault, l represents the total length of Fisrt fault loop line.
In order to further improve fault localization precision, the measuring distance of transmission line fault system in the present embodiment, also may be used
To farther include the first precision judge module, correcting module and the second precision judge module: correcting module includes determining submodule
Block and correction submodule;Wherein,
First precision judge module, is used for judging whether revised fault localization value meets and presets range accuracy, if
It is then revised fault localization value to be defined as final fault localization value, if it is not, then trigger correcting module startup work;
Determine submodule, for revised fault localization value being defined as the fault localization value treating again to revise;
Revise submodule, for treating that the fault localization value again revised carries out correcting process again, obtain current correction value;
Second precision judge module, whether the current correction value obtained for judgment amendment module meets default range finding essence
Degree, if it is not, then current correction value to be defined as the fault localization value treating again to revise, and trigger correction submodule be again started up
Work, if it is, be defined as final fault localization value by current correction value.
Concrete, above-mentioned correction submodule includes parameters revision unit and fault localization unit again;Wherein, every time
Treating during the fault localization value again revised carries out again correcting process, above-mentioned parameter amending unit, specifically for profit
With treating the fault localization value again revised and above-mentioned second Temporal Data, again calculate the positive order parameter of circuit after fault, obtain
The positive order parameter of revised circuit, and the above-mentioned unit of fault localization again, then specifically for just utilizing above-mentioned revised circuit
Order parameter and above-mentioned first Temporal Data carry out fault localization again, obtain corresponding current correction value.
Finally, in addition it is also necessary to explanation, in this article, the relational terms of such as first and second or the like be used merely to by
One entity or operation separate with another entity or operating space, and not necessarily require or imply these entities or operation
Between exist any this reality relation or order.And, term " includes ", " comprising " or its any other variant meaning
Containing comprising of nonexcludability, so that include that the process of a series of key element, method, article or equipment not only include that
A little key elements, but also include other key elements being not expressly set out, or also include for this process, method, article or
The key element that equipment is intrinsic.In the case of there is no more restriction, statement " including ... " key element limited, do not arrange
Except there is also other identical element in including the process of described key element, method, article or equipment.
Above a kind of fault positioning method for transmission line provided by the present invention and system are described in detail, herein
In apply specific case principle and the embodiment of the present invention be set forth, the explanation of above example is only intended to side
Assistant solves method and the core concept thereof of the present invention;Simultaneously for one of ordinary skill in the art, according to the think of of the present invention
Thinking, the most all will change, in sum, it is right that this specification content should not be construed as
The restriction of the present invention.
Claims (12)
1. a fault positioning method for transmission line, it is characterised in that including:
After utilizing the positive order parameter of the circuit before fault and fault, the first Temporal Data of circuit carries out initial fault range finding, at the beginning of obtaining
Beginning distance measurement value;Wherein, the propagation coefficient before the positive order parameter of circuit before described fault includes fault and the characteristic impedance before fault;
Utilize the second Temporal Data of circuit after described initial ranging value and fault, calculate the positive order parameter of circuit after fault;Its
In, the positive order parameter of circuit after described fault includes the propagation coefficient after fault and the characteristic impedance after fault;
The positive order parameter of the circuit after described fault and described first Temporal Data is utilized to carry out fault localization again, after being revised
Fault localization value.
Fault positioning method for transmission line the most according to claim 1, it is characterised in that described utilize the circuit before fault
After positive order parameter and fault, the first Temporal Data of circuit carries out initial fault range finding, obtains the process of initial ranging value, including:
Utilize the positive order parameter of the circuit before described fault and described first Temporal Data, default equation is solved, obtains institute
State initial ranging value;Wherein, described default equation is:
In formula, γ0Represent the propagation coefficient before described fault, Z0Represent the characteristic impedance before described fault;After representing fault
The positive sequence voltage of the delivery end of Fisrt fault loop line,The positive sequence electricity of the delivery end of described Fisrt fault loop line after expression fault
Stream,The positive sequence voltage of the receiving terminal of described Fisrt fault loop line after expression fault,Represent described Fisrt fault after fault
The forward-order current of the receiving terminal of loop line;L represents the total length of described Fisrt fault loop line, x0Represent described initial ranging value, ch
(*) representing hyperbolic cosine function, sh (*) represents hyperbolic sine function.
Fault positioning method for transmission line the most according to claim 2, it is characterised in that described utilize described initial ranging
Second Temporal Data of circuit after value and fault, calculates the process of the positive order parameter of circuit after fault, including:
Utilize described initial ranging value and described second Temporal Data, the first equation group is solved, after obtaining described fault
The positive order parameter of circuit;
Wherein, described first equation group includes:
In formula, x0Represent described initial ranging value;The positive sequence voltage of the delivery end of described Fisrt fault loop line after expression fault,The forward-order current of the delivery end of described Fisrt fault loop line after expression fault,Represent described Fisrt fault loop line after fault
The positive sequence voltage of receiving terminal,The forward-order current of the receiving terminal of described Fisrt fault loop line after expression fault,Represent event
The negative sequence voltage of the delivery end of described Fisrt fault loop line after barrier,The delivery end of described Fisrt fault loop line after expression fault
Negative-sequence current,The negative sequence voltage of the receiving terminal of described Fisrt fault loop line after expression fault,Represent described in after fault
The negative-sequence current of the receiving terminal of Fisrt fault loop line;γ1Represent the propagation coefficient after described fault, Z1After representing described fault
Characteristic impedance, l represents the total length of described Fisrt fault loop line.
Fault positioning method for transmission line the most according to claim 2, it is characterised in that described utilize described initial ranging
Second Temporal Data of circuit after value and fault, calculates the process of the positive order parameter of circuit after fault, including:
Utilize described initial ranging value and described second Temporal Data, the second equation group is solved, after obtaining described fault
The positive order parameter of circuit;
Wherein, described second equation group includes:
In formula, x0Represent described initial ranging value;The positive sequence voltage of the delivery end of described Fisrt fault loop line after expression fault,The forward-order current of the delivery end of described Fisrt fault loop line after expression fault,Represent described Fisrt fault loop line after fault
The positive sequence voltage of receiving terminal,The forward-order current of the receiving terminal of described Fisrt fault loop line after expression fault,Represent event
The positive sequence voltage of the delivery end of the second fault loop line after barrier,After expression fault, the delivery end of described second fault loop line is just
Sequence electric current,The positive sequence voltage of the receiving terminal of described second fault loop line after expression fault,Represent after fault described second
The forward-order current of the receiving terminal of fault loop line;γ1Represent the propagation coefficient after described fault, Z1Represent the characteristic after described fault
Impedance, l represents the total length of described Fisrt fault loop line.
5. according to the fault positioning method for transmission line described in any one of Claims 1-4, it is characterised in that also include:
Step S41: judge whether described revised fault localization value meets and preset range accuracy, if it is, repair described
Fault localization value after just is defined as final fault localization value, if it is not, then enter step S42;
Step S42: described revised fault localization value is defined as the fault localization value treating again to revise;
Step S43: treat the fault localization value again revised and carry out correcting process again, obtain current correction value;
Step S44: judge whether current correction value meets described default range accuracy, if it is not, then determine current correction value
For treating the fault localization value again revised, and reenter step S43, if it is, current correction value to be defined as final event
Barrier distance measurement value, and terminate correcting process.
Fault positioning method for transmission line the most according to claim 5, it is characterised in that every time treat the event again revised
Barrier distance measurement value carries out again the process of correcting process, including:
Utilize the fault localization value and described second Temporal Data treating again to revise, again calculate the circuit positive sequence ginseng after fault
Number, obtains the positive order parameter of revised circuit;
Utilize the described positive order parameter of revised circuit and described first Temporal Data to carry out fault localization again, obtain corresponding
Current correction value.
7. a measuring distance of transmission line fault system, it is characterised in that including:
Initial fault range finder module, after being used for the positive order parameter of circuit before utilizing fault and fault, the first Temporal Data of circuit enters
Row initial fault is found range, and obtains initial ranging value;Wherein, the propagation system before the positive order parameter of circuit before described fault includes fault
Characteristic impedance before number and fault;
Parameter calculating module, the second Temporal Data of circuit after utilizing described initial ranging value and fault, after calculating fault
The positive order parameter of circuit;Wherein, the propagation coefficient after the positive order parameter of circuit after described fault includes fault and the spy after fault
Property impedance;
Fault localization module again, the positive order parameter of circuit and described first Temporal Data after utilizing described fault are carried out again
Secondary fault localization, obtains revised fault localization value.
Measuring distance of transmission line fault system the most according to claim 7, it is characterised in that described initial fault range finding mould
Block, specifically utilizes the positive order parameter of the circuit before described fault and described first Temporal Data, solves default equation, obtain
Described initial ranging value;Wherein, described default equation is:
In formula, γ0Represent the propagation coefficient before described fault, Z0Represent the characteristic impedance before described fault;After representing fault
The positive sequence voltage of the delivery end of Fisrt fault loop line,The positive sequence electricity of the delivery end of described Fisrt fault loop line after expression fault
Stream,The positive sequence voltage of the receiving terminal of described Fisrt fault loop line after expression fault,Represent described Fisrt fault after fault
The forward-order current of the receiving terminal of loop line;L represents the total length of described Fisrt fault loop line, x0Represent described initial ranging value, ch
(*) representing hyperbolic cosine function, sh (*) represents hyperbolic sine function.
Measuring distance of transmission line fault system the most according to claim 8, it is characterised in that described parameter calculating module, tool
Body is used for utilizing described initial ranging value and described second Temporal Data, solves the first equation group, obtains described fault
After the positive order parameter of circuit;
Wherein, described first equation group includes:
In formula, x0Represent described initial ranging value;The positive sequence voltage of the delivery end of described Fisrt fault loop line after expression fault,The forward-order current of the delivery end of described Fisrt fault loop line after expression fault,Represent described Fisrt fault loop line after fault
The positive sequence voltage of receiving terminal,The forward-order current of the receiving terminal of described Fisrt fault loop line after expression fault,Represent event
The negative sequence voltage of the delivery end of described Fisrt fault loop line after barrier,The delivery end of described Fisrt fault loop line after expression fault
Negative-sequence current,The negative sequence voltage of the receiving terminal of described Fisrt fault loop line after expression fault,Represent described in after fault
The negative-sequence current of the receiving terminal of Fisrt fault loop line;γ1Represent the propagation coefficient after described fault, Z1After representing described fault
Characteristic impedance, l represents the total length of described Fisrt fault loop line.
Measuring distance of transmission line fault system the most according to claim 8, it is characterised in that described parameter calculating module, tool
Body is used for utilizing described initial ranging value and described second Temporal Data, solves the second equation group, obtains described fault
After the positive order parameter of circuit;
Wherein, described second equation group includes:
In formula, x0Represent described initial ranging value;The positive sequence voltage of the delivery end of described Fisrt fault loop line after expression fault,The forward-order current of the delivery end of described Fisrt fault loop line after expression fault,Represent described Fisrt fault loop line after fault
The positive sequence voltage of receiving terminal,The forward-order current of the receiving terminal of described Fisrt fault loop line after expression fault,Represent event
The positive sequence voltage of the delivery end of the second fault loop line after barrier,The positive sequence of the delivery end of described second fault loop line after expression fault
Electric current,The positive sequence voltage of the receiving terminal of described second fault loop line after expression fault,Described second event after representing fault
The forward-order current of the receiving terminal of barrier loop line;γ1Represent the propagation coefficient after described fault, Z1Represent that the characteristic after described fault hinders
Anti-, l represents the total length of described Fisrt fault loop line.
11. according to the measuring distance of transmission line fault system described in any one of claim 7 to 10, it is characterised in that also include
One precision judge module, correcting module and the second precision judge module: described correcting module includes determining submodule and correction
Submodule;Wherein,
Described first precision judge module, is used for judging whether described revised fault localization value meets and presets range accuracy,
If it is, described revised fault localization value is defined as final fault localization value, if it is not, then trigger described correction mould
Block startup work;
Described determine submodule, for described revised fault localization value being defined as the fault localization value treating again to revise;
Described correction submodule, for treating that the fault localization value again revised carries out correcting process again, obtains current correction value;
Described second precision judge module, for judging whether the current correction value that described correcting module obtains meets described presetting
Range accuracy, if it is not, then current correction value is defined as the fault localization value treating again to revise, and triggers described correction submodule
Block is again started up work, if it is, current correction value is defined as final fault localization value.
12. measuring distance of transmission line fault systems according to claim 11, it is characterised in that described correction submodule bag
Include:
Parameters revision unit, for utilizing the fault localization value and described second Temporal Data treating again to revise, calculates event again
The positive order parameter of circuit after barrier, obtains the positive order parameter of revised circuit;
Fault localization unit again, is used for utilizing the described positive order parameter of revised circuit and described first Temporal Data to carry out again
Secondary fault localization, obtains corresponding current correction value.
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