CN111781468A - T-shaped high-voltage transmission line asynchronous fault distance measurement method and system - Google Patents
T-shaped high-voltage transmission line asynchronous fault distance measurement method and system Download PDFInfo
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Abstract
The invention relates to a T-shaped high-voltage transmission line asynchronous fault distance measurement method, which comprises the steps of extracting positive sequence voltage and current at three ends and fundamental wave phasor values of the positive sequence fault voltage and current; then, assuming that the fault occurs on each branch, obtaining the distance between the fault and the T node by using a distance measurement equation; then directly distinguishing fault branches and fault distances by using the characteristics of the distances obtained by the branches; and the correctness of the data is verified through an auxiliary criterion. The method utilizes the positive sequence component and the positive sequence fault component to directly measure the distance without judging the fault type, directly integrates fault branch judgment and fault distance measurement into a whole, is simple, does not need iteration, has no pseudo root, and avoids the defect that the traditional asynchronous fault distance measuring method needs to identify the pseudo root. The invention also provides a T-shaped high-voltage transmission line asynchronous fault distance measuring system.
Description
Technical Field
The invention relates to the technical field of power transmission systems, in particular to a T-shaped high-voltage transmission line asynchronous fault distance measurement method and system.
Background
The T-shaped power transmission line has large transmission power and heavy load, and once a fault occurs, it is very important to reliably and accurately find a fault position. The fault location method can be mainly divided into a traveling wave location method and a fault analysis location method in principle. The traveling wave distance measurement method has the defects that the traveling wave has dispersion phenomenon, the distance measurement dead zone exists when the voltage zero-crossing fault occurs, special hardware facilities need to be invested, the technical implementation is complex and the like, and the fault analysis distance measurement method has the advantages of being capable of utilizing the existing equipment, low in investment and the like, so that the method is widely applied.
The fault analysis ranging method can be divided into a synchronous ranging method and an asynchronous ranging method according to whether data at each end is synchronous or not. The synchronous ranging method utilizes a synchronization method to synchronize data of each end, but the asynchronous ranging method is widely applied because the data of each end cannot be completely synchronized in consideration of delay errors of equipment, networks and the like. The traditional T-type asynchronous ranging method is used for fault ranging in two steps, firstly, different voltages of T nodes obtained by each end are used for judging a fault branch, secondly, normal branches are combined into a branch, and then the branch and the fault branch are equivalent to a double-end line for double-end asynchronous fault ranging, when a high-resistance fault occurs near the T node, the voltages obtained by each end are approximately the same, the fault of the T node can be judged when errors such as a mutual inductor are considered, and therefore the ranging error is larger.
Disclosure of Invention
In view of the above, it is necessary to provide an asynchronous fault location method for a T-type high-voltage transmission line, which can reliably and accurately find a fault location.
It is also necessary to provide a T-type high-voltage transmission line asynchronous fault location system which can reliably and accurately find the fault location.
A T-shaped high-voltage transmission line asynchronous fault distance measurement method comprises the following steps:
s001, respectively marking three ends of the T-shaped power transmission line as M, N, P, performing data filtering on voltage and current data of a M, N, P three-end measuring point, extracting fundamental phasor, and solving positive sequence voltage and current and positive sequence fault voltage and current of the three-end measuring point by using a symmetric component method;
step S002, substituting the positive sequence voltage and current of the measuring point and the positive sequence fault voltage and current into a formula according to the positive sequence wave impedance and the propagation coefficient of the line by using the line lengths of the MT, NT and PT branches, and respectively solving the positive sequence voltage and the positive sequence fault voltage of the T node and the positive sequence current and the positive sequence fault current injected into the T node;
s003, assuming one of the three branches as a fault branch, taking a fault point on the branch as an imaginary fault point, substituting the data of each end into a distance measurement function of the branch, and calculating the distance between the imaginary fault point and the T node; and in the same way, respectively assuming the other two branches as the branches with faults, bringing the data at each end into the ranging function of each branch, and calculating the distance between the other two supposed fault points and the T node.
And step S004, comparing the distances from the three virtual fault points to the T node with the line length of the corresponding branch, if the distance from one virtual fault point to the T node is less than the line length of the branch and more than zero, the fault occurs on the branch, and the virtual fault distance of the branch is calculated to be the distance from the fault to the T node.
Preferably, the positive sequence voltage U of the T node is respectively solved by utilizing the line lengths of the MT, NT and PT branches and substituting the positive sequence voltage and current of a measuring point and the positive sequence fault voltage and current into a formula according to the positive sequence wave impedance and the propagation coefficient of the lineiT(i-M, N, P), positive sequence fault voltage Δ UiTAnd a positive sequence current I injected into the T nodeiTPositive sequence fault current delta IiTComprises the following steps:
wherein, Ui、ΔUiPositive sequence voltage and positive sequence fault voltage of terminal I, respectivelyi、ΔIiPositive sequence current and positive sequence fault current at terminal i,/iTThe length of the circuit of the iT branch is Z, the positive sequence wave impedance of the circuit is Z, and the positive sequence propagation coefficient of the circuit is gamma.
Preferably, in step S003, assuming that the fault occurs on the MT branch, the ranging function is:
wherein the content of the first and second substances,
B1＝2(UNTIPT-UPTINT)ΔIPTZ-2(ΔUNTΔIPT-ΔUPTΔINT)IPTZ，
C1＝(ΔUNTΔIPT-ΔUPTΔINT)UPT-(UNTIPT-UPTINT)ΔUPT，
A2＝(ΔUPTΔINT-ΔUNTΔIPT)(2UMTINT+UNTIMT)-(UPTINT-UNTIPT)(2ΔUMTΔINT+ΔUNTΔIMT)，
B2＝2(UPTINT-UNTIPT)ΔINTZ-2(ΔUPTΔINT-ΔUNTΔIPT)INTZ，
C2＝(ΔUPTΔINT-ΔUNTΔIPT)UNT-(UPTINT-UNTIPT)ΔUNT。
preferably, in step S003, assuming that the fault occurs on the NT branch, the ranging function is:
wherein the content of the first and second substances,
B1＝2(UMTIPT-UPTIMT)ΔIPTZ-2(ΔUMTΔIPT-ΔUPTΔIMT)IPTZ，
C1＝(ΔUMTΔIPT-ΔUPTΔIMT)UPT-(UMTIPT-UPTIMT)ΔUPT，
A2＝(ΔUPTΔIMT-ΔUMTΔIPT)(2UNTIMT+UMTINT)-(UPTIMT-UMTIPT)(2ΔUNTΔIMT+ΔUMTΔINT)，
B2＝2(UPTIMT-UMTIPT)ΔIMTZ-2(ΔUPTΔIMT-ΔUMTΔIPT)IMTZ，
C2＝(ΔUPTΔIMT-ΔUMTΔIPT)UMT-(UPTIMT-UMTIPT)ΔUMT。
preferably, in step S003, assuming that a fault occurs on the PT branch, the ranging function is:
wherein
B1＝2(UMTINT-UNTIMT)ΔINTZ-2(ΔUMTΔINT-ΔUNTΔIMT)INTZ，
C1＝(ΔUMTΔINT-ΔUNTΔIMT)UNT-(UMTINT-UNTIMT)ΔUNT，
A2＝(ΔUNTΔIMT-ΔUMTΔINT)(2UPTIMT+UMTIPT)-(UNTIMT-UMTINT)(2ΔUPTΔIMT+ΔUMTΔIPT)，
B2＝2(UNTIMT-UMTINT)ΔIMTZ-2(ΔUNTΔIMT-ΔUMTΔINT)IMTZ，
C2＝(ΔUNTΔIMT-ΔUMTΔINT)UMT-(UNTIMT-UMTINT)ΔUMT。
Preferably, the T-type high-voltage transmission line non-synchronous fault distance measuring method further comprises an auxiliary criterion for verifying the correctness of data, namely, the distance from the virtual fault point of the non-fault branch to the T node
Distance from fault point of fault branch to T node
Introducing an auxiliary criterion function:
wherein f is a modulo function; if f is<Then the distance between the fault point and the T node is calculated to be effective; if f is>If so, performing reinforced filtering on the data of the three ends, and recalculating; when the distances from the virtual fault points on the two or three solved branches to the T node are all satisfied
When, if f<Then, the actual fault is the T node fault; if f>Then the data of the three terminals is reinforced and filtered to be recalculated.
A T-shaped high-voltage transmission line asynchronous fault ranging system comprises a data input module, a data extraction module, a ranging function calculation module and a numerical analysis module. The data input module is used for inputting M, N, P voltage and current data of three-terminal measuring points into the system; the data extraction module is used for filtering voltage and current data of the measuring points, extracting fundamental phasor, solving a positive sequence component and a positive sequence fault component of three ends by using a symmetric component method, and outputting the positive sequence component and the positive sequence fault component of the three ends to the ranging function calculation module; the distance measurement function calculation module is used for calculating the distance from the virtual fault point to the T node on the three branches; and the numerical analysis module is used for analyzing the distance from the supposed fault point to the T node, verifying the correctness of the data through auxiliary criteria and obtaining a fault branch and a fault distance.
Has the advantages that: the asynchronous fault distance measurement method for the T-shaped high-voltage transmission line integrates fault branch judgment and fault distance measurement, has no distance measurement dead zone, and has no defect of pseudo roots in the traditional asynchronous distance measurement method; the distance measurement method has no complex iterative program, can obtain the fault distance by using an analytical expression, has auxiliary criteria to judge the correctness of data, and is simple and reliable; the distance measurement method does not need to judge the fault type, is basically not influenced by transition resistance, system impedance, asynchronous angles, fault positions and the like, and has high distance measurement precision.
Drawings
Fig. 1 is a flowchart of the T-type high-voltage transmission line asynchronous fault location method of the present invention.
Fig. 2 is a schematic diagram of a T-type transmission line fault ranging on an NT branch when the fault occurs on the NT branch.
Fig. 3 is a schematic diagram of a T-type transmission line fault ranging on NT branch when a fault occurs on MT branch.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will be given with reference to the embodiments.
A T-shaped high-voltage transmission line asynchronous fault distance measurement method comprises the following steps:
please refer to fig. 1, in step S001, three terminals of the T-type power transmission line are respectively labeled as M, N, P, data filtering is performed on voltage and current data of M, N, P three-terminal measurement points, fundamental phasor is extracted, and positive sequence voltage, current and positive sequence fault voltage, current of the three-terminal measurement points are solved by using a symmetric component method;
step S002, substituting the positive sequence voltage and current of the measuring point and the positive sequence fault voltage and current into a formula according to the positive sequence wave impedance and the propagation coefficient of the line by using the line lengths of the MT, NT and PT branches, and solving the positive sequence voltage and the positive sequence fault voltage from each end to the T node and the positive sequence current and the positive sequence fault current injected into the T node;
s003, assuming one of the three branches as a fault branch, taking a fault point on the branch as an imaginary fault point, substituting the data of each end into a distance measurement function of the branch, and calculating the distance between the imaginary fault point and the T node; and in the same way, respectively assuming the other two branches as the branches with faults, bringing the data at each end into the ranging function of each branch, and calculating the distance between the other two supposed fault points and the T node.
And step S004, comparing the distances from the three virtual fault points to the T node with the line length of the corresponding branch, if the distance from one virtual fault point to the T node is less than the line length of the branch and more than zero, the fault occurs on the branch, and the virtual fault distance of the branch is calculated to be the distance from the fault to the T node.
Preferably, in step S002, the positive sequence voltage U of the T node is respectively solved by using the line lengths of the MT, NT and PT branches and substituting the positive sequence voltage and current of the measurement point and the positive sequence fault voltage and current into a formula according to the positive sequence wave impedance and propagation coefficient of the lineiT(i-M, N, P), positive sequence fault voltage Δ UiTAnd a positive sequence current I injected into the T nodeiTPositive sequence fault current delta IiTComprises the following steps:
wherein, Ui、ΔUiPositive sequence voltage and positive sequence fault voltage of terminal I, respectivelyi、ΔIiPositive sequence current and positive sequence fault current at terminal i,/iTThe length of the circuit of the iT branch is Z, the positive sequence wave impedance of the circuit is Z, and the positive sequence propagation coefficient of the circuit is gamma.
Preferably, in step S003, assuming that the fault occurs on the MT branch, the ranging function is:
wherein the content of the first and second substances,
B1＝2(UNTIPT-UPTINT)ΔIPTZ-2(ΔUNTΔIPT-ΔUPTΔINT)IPTZ，
C1＝(ΔUNTΔIPT-ΔUPTΔINT)UPT-(UNTIPT-UPTINT)ΔUPT，
A2＝(ΔUPTΔINT-ΔUNTΔIPT)(2UMTINT+UNTIMT)-(UPTINT-UNTIPT)(2ΔUMTΔINT+ΔUNTΔIMT)，
B2＝2(UPTINT-UNTIPT)ΔINTZ-2(ΔUPTΔINT-ΔUNTΔIPT)INTZ，
C2＝(ΔUPTΔINT-ΔUNTΔIPT)UNT-(UPTINT-UNTIPT)ΔUNT。
preferably, in step S003, assuming that the fault occurs on the NT branch, the ranging function is:
wherein the content of the first and second substances,
B1＝2(UMTIPT-UPTIMT)ΔIPTZ-2(ΔUMTΔIPT-ΔUPTΔIMT)IPTZ，
C1＝(ΔUMTΔIPT-ΔUPTΔIMT)UPT-(UMTIPT-UPTIMT)ΔUPT，
A2＝(ΔUPTΔIMT-ΔUMTΔIPT)(2UNTIMT+UMTINT)-(UPTIMT-UMTIPT)(2ΔUNTΔIMT+ΔUMTΔINT)，
B2＝2(UPTIMT-UMTIPT)ΔIMTZ-2(ΔUPTΔIMT-ΔUMTΔIPT)IMTZ，
C2＝(ΔUPTΔIMT-ΔUMTΔIPT)UMT-(UPTIMT-UMTIPT)ΔUMT。
preferably, in step S003, assuming that a fault occurs on the PT branch, the ranging function is:
wherein the content of the first and second substances,
B1＝2(UMTINT-UNTIMT)ΔINTZ-2(ΔUMTΔINT-ΔUNTΔIMT)INTZ，
C1＝(ΔUMTΔINT-ΔUNTΔIMT)UNT-(UMTINT-UNTIMT)ΔUNT，
A2＝(ΔUNTΔIMT-ΔUMTΔINT)(2UPTIMT+UMTIPT)-(UNTIMT-UMTINT)(2ΔUPTΔIMT+ΔUMTΔIPT)，
B2＝2(UNTIMT-UMTINT)ΔIMTZ-2(ΔUNTΔIMT-ΔUMTΔINT)IMTZ，
C2＝(ΔUNTΔIMT-ΔUMTΔINT)UMT-(UNTIMT-UMTINT)ΔUMT。
preferably, the T-type high-voltage transmission line non-synchronous fault distance measuring method further comprises an auxiliary criterion for verifying the correctness of data, namely, the distance from the virtual fault point of the non-fault branch to the T node
Distance from fault point of fault branch to T node
Introducing an auxiliary criterion function:
wherein f is a modulo function; if f is<Then the distance between the fault point and the T node is calculated to be effective; if f is>If so, performing reinforced filtering on the data of the three ends, and recalculating; when the distances from the virtual fault points on the two or three solved branches to the T node are all satisfied
When, if f<Then, the actual fault is the T node fault; if f>Then the data of the three terminals is reinforced and filtered to be recalculated.
Under the ideal condition of the water-cooling device,
considering the actual transformer acquisition error, extracting fundamental wave vector error and the like, the method can lead
Close to 0 but not zero, so in practical applications a threshold needs to be set. When in use
When the obtained value is within the threshold range, the three-terminal data are accurate, and the distances from the fault branch and the fault point to the T node, which are obtained according to the ranging function, are accurate; when in use
If the obtained value is not in the threshold range, the error of the data extracted from the three ends is large, and at this time, the data of the three ends are subjected to reinforced filtering and are calculated again.
Taking the case that the fault occurs on the NT branch as an example, as shown in fig. 2:
the positive sequence voltage of the T node and the positive sequence current injected into the T node have the following relations with the positive sequence voltage and the positive sequence current of the N end:
based on the N-end data, the asynchronous angle of the M-end data relative to the N-end data is1The asynchronous angle of the P-end data relative to the N-end data is2And make an order
Then there is
Similarly, the positive sequence fault voltage and the positive sequence fault current injected into the T node and the positive sequence fault voltage and the positive sequence fault current at the N end have the following relations:
the distance between the fault point and the T node can be obtained through the joint type (2) and the formula (3):
wherein the content of the first and second substances,
B1＝2(UMTIPT-UPTIMT)ΔIPTZ-2(ΔUMTΔIPT-ΔUPTΔIMT)IPTZ，
C1＝(ΔUMTΔIPT-ΔUPTΔIMT)UPT-(UMTIPT-UPTIMT)ΔUPT，
A2＝(ΔUPTΔIMT-ΔUMTΔIPT)(2UNTIMT+UMTINT)-(UPTIMT-UMTIPT)(2ΔUNTΔIMT+ΔUMTΔINT)，
B2＝2(UPTIMT-UMTIPT)ΔIMTZ-2(ΔUPTΔIMT-ΔUMTΔIPT)IMTZ，
C2＝(ΔUPTΔIMT-ΔUMTΔIPT)UMT-(UPTIMT-UMTIPT)ΔUMT。
when the actual fault occurs on the NT branch, there are
When the actual failure does not occur on the NT branch, but on the MT branch, as shown in fig. 3.
In the same way, there are
The distance l between the fault point and the T node can be obtained from the formula (5)TfIs composed of
L in equation (6) due to the actual failure occurring on the MT legTfThe distance from the actual fault to the T node is lTf>0, the expression on the right side of the equal sign of the formula (6) is less than 0. When the virtual fault occurs in the NT branch and the distance measurement is performed by the equation (4), the result obtained by the equation (4) is compared with the right expression having the same sign as the equation (6)
The results are shown in formula (4) and formula (6)
Obtained by ranging on MT branches due to actual faults occurring on MT branches
Is thatTfI.e. by
When the actual fault does not occur on the MT branch but on the PT branch, the MT and PT branches are electrically symmetrical, and the same principle also exists
Supposing that the fault occurs on the MT branch, the same principle is that the distance measurement is carried out on the MT branch
Wherein the content of the first and second substances,
A1＝(ΔUNTΔIPT-ΔUPTΔINT)(2UMTIPT+UPTIMT)-(UNTIPT-UPTINT)(2ΔUMTΔIPT+ΔUPTΔIMT)，
B1＝2(UNTIPT-UPTINT)ΔIPTZ-2(ΔUNTΔIPT-ΔUPTΔINT)IPTZ，
C1＝(ΔUNTΔIPT-ΔUPTΔINT)UPT-(UNTIPT-UPTINT)ΔUPT，
A2＝(ΔUPTΔINT-ΔUNTΔIPT)(2UMTINT+UNTIMT)-(UPTINT-UNTIPT)(2ΔUMTΔINT+ΔUNTΔIMT)，
B2＝2(UPTINT-UNTIPT)ΔINTZ-2(ΔUPTΔINT-ΔUNTΔIPT)INTZ，
C2＝(ΔUPTΔINT-ΔUNTΔIPT)UNT-(UPTINT-UNTIPT)ΔUNT。
if obtained
And satisfy
A failure occurs on the MT branch,
the distance of the fault from the T node; if obtained
The failure does not occur on the MT branch.
The supposed fault occurs on the PT branch, and the distance measurement on the PT branch is carried out similarly
Wherein the content of the first and second substances,
A1＝(ΔUMTΔINT-ΔUNTΔIMT)(2UPTINT+UNTIPT)-(UMTINT-UNTIMT)(2ΔUPTΔINT+ΔUNTΔIPT)，
B1＝2(UMTINT-UNTIMT)ΔINTZ-2(ΔUMTΔINT-ΔUNTΔIMT)INTZ，
C1＝(ΔUMTΔINT-ΔUNTΔIMT)UNT-(UMTINT-UNTIMT)ΔUNT，
A2＝(ΔUNTΔIMT-ΔUMTΔINT)(2UPTIMT+UMTIPT)-(UNTIMT-UMTINT)(2ΔUPTΔIMT+ΔUMTΔIPT)，
B2＝2(UNTIMT-UMTINT)ΔIMTZ-2(ΔUNTΔIMT-ΔUMTΔINT)IMTZ，
C2＝(ΔUNTΔIMT-ΔUMTΔINT)UMT-(UNTIMT-UMTINT)ΔUMT。
if obtained
And satisfy
The failure occurs on the PT branch,
the distance of the fault from the T node; if obtained
The failure does not occur on the PT branch.
The asynchronous fault distance measurement method for the T-shaped high-voltage transmission line integrates fault branch judgment and fault distance measurement, has no distance measurement dead zone, and has no defect of pseudo roots in the traditional asynchronous distance measurement method; the distance measurement method has no complex iterative program, can obtain the fault distance by using an analytical expression, has auxiliary criteria to judge the correctness of data, and is simple and reliable; the distance measurement method does not need to judge the fault type, is basically not influenced by transition resistance, system impedance, asynchronous angles, fault positions and the like, and has high distance measurement precision.
The invention also provides a T-shaped high-voltage transmission line asynchronous fault distance measurement system which comprises a data input module, a data extraction module, a distance measurement function calculation module and a numerical analysis module. The data input module is used for inputting M, N, P voltage and current data of three-terminal measuring points into the system; the data extraction module is used for filtering voltage and current data of the measuring points, extracting fundamental phasor, solving a positive sequence component and a positive sequence fault component of three ends by using a symmetric component method, and outputting the positive sequence component and the positive sequence fault component of the three ends to the ranging function calculation module; the distance measurement function calculation module is used for calculating the distance from the virtual fault point to the T node on the three branches; and the numerical analysis module is used for analyzing the distance from the supposed fault point to the T node, verifying the correctness of the data through auxiliary criteria and obtaining a fault branch and a fault distance.
Specifically, voltage and current data of M, N, P three terminals are input into the data input module, the distance measurement function calculation module calculates the virtual fault distance of each branch after passing through the data extraction module, and the numerical analysis module calculates the false fault distance of each branchAnalyzing and judging the fault distance: if the distance between the supposed fault point and the T node is less than or equal to zero, the branch is preliminarily judged to be a non-fault branch; and if the distance from the supposed fault point to the T node is less than the line length of the branch and greater than zero, the branch is preliminarily judged to be a fault branch. The numerical analysis module also compares the hypothetical fault distance of the non-faulty branch
Distance to fault branch
Function with auxiliary criteria
If f is<Then outputting the fault distance and the fault branch; if f is>And then, the data of the three ends are subjected to enhanced filtering, and the calculation is carried out again. In the numerical analysis module, when the distances from the virtual fault points on the two or three solved branches to the T node are all satisfied
When, if f<Then, the actual fault is the T node fault; if f>Then the data of the three terminals is reinforced and filtered to be recalculated.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (6)
1. A T-shaped high-voltage transmission line asynchronous fault distance measurement method is characterized by comprising the following steps: the method comprises the following steps:
s001, respectively marking three ends of the T-shaped power transmission line as M, N, P, performing data filtering on voltage and current data of a M, N, P three-end measuring point, extracting fundamental phasor, and solving positive sequence voltage and current and positive sequence fault voltage and current of the three-end measuring point by using a symmetric component method;
step S002, substituting the positive sequence voltage and current of the measuring point and the positive sequence fault voltage and current into a formula according to the positive sequence wave impedance and the propagation coefficient of the line by using the line lengths of the MT, NT and PT branches, and respectively solving the positive sequence voltage and the positive sequence fault voltage of the T node and the positive sequence current and the positive sequence fault current injected into the T node;
s003, assuming one of the three branches as a fault branch, taking a fault point on the branch as an imaginary fault point, substituting the data of each end into a distance measurement function of the branch, and calculating the distance between the imaginary fault point and the T node; and in the same way, respectively assuming the other two branches as the branches with faults, bringing the data at each end into the ranging function of each branch, and calculating the distance between the other two supposed fault points and the T node.
And step S004, comparing the distances from the three virtual fault points to the T node with the line length of the corresponding branch, if the distance from one virtual fault point to the T node is less than the line length of the branch and more than zero, the fault occurs on the branch, and the virtual fault distance of the branch is calculated to be the distance from the fault to the T node.
2. The T-type high-voltage transmission line non-synchronous fault location method of claim 1, characterized in that: in step S002, the positive sequence voltage U of the T node is respectively solved by using the line lengths of the MT, NT, and PT branches and substituting the positive sequence voltage and current of the measurement point and the positive sequence fault voltage and current into a formula according to the positive sequence wave impedance and propagation coefficient of the lineiT(i-M, N, P), positive sequence fault voltage Δ UiTAnd a positive sequence current I injected into the T nodeiTPositive sequence fault current delta IiTComprises the following steps:
wherein, Ui、ΔUiPositive sequence voltage and positive sequence fault voltage of terminal I, respectivelyi、ΔIiIs terminal iPositive sequence current and positive sequence fault current,/iTThe length of the circuit of the iT branch is Z, the positive sequence wave impedance of the circuit is Z, and the positive sequence propagation coefficient of the circuit is gamma.
3. The T-type high-voltage transmission line non-synchronous fault location method of claim 1, characterized in that: in step S003, assuming that a fault occurs on the MT branch, the ranging function is:
wherein the content of the first and second substances,
B1＝2(UNTIPT-UPTINT)ΔIPTZ-2(ΔUNTΔIPT-ΔUPTΔINT)IPTZ，
C1＝(ΔUNTΔIPT-ΔUPTΔINT)UPT-(UNTIPT-UPTINT)ΔUPT，
A2＝(ΔUPTΔINT-ΔUNTΔIPT)(2UMTINT+UNTIMT)-(UPTINT-UNTIPT)(2ΔUMTΔINT+ΔUNTΔIMT)，
B2＝2(UPTINT-UNTIPT)ΔINTZ-2(ΔUPTΔINT-ΔUNTΔIPT)INTZ，
C2＝(ΔUPTΔINT-ΔUNTΔIPT)UNT-(UPTINT-UNTIPT)ΔUNT。
4. the T-type high-voltage transmission line non-synchronous fault location method of claim 1, characterized in that: in step S003, assuming that a fault occurs on the NT branch, the ranging function is:
wherein the content of the first and second substances,
B1＝2(UMTIPT-UPTIMT)ΔIPTZ-2(ΔUMTΔIPT-ΔUPTΔIMT)IPTZ，
C1＝(ΔUMTΔIPT-ΔUPTΔIMT)UPT-(UMTIPT-UPTIMT)ΔUPT，
A2＝(ΔUPTΔIMT-ΔUMTΔIPT)(2UNTIMT+UMTINT)-(UPTIMT-UMTIPT)(2ΔUNTΔIMT+ΔUMTΔINT)，
B2＝2(UPTIMT-UMTIPT)ΔIMTZ-2(ΔUPTΔIMT-ΔUMTΔIPT)IMTZ，
C2＝(ΔUPTΔIMT-ΔUMTΔIPT)UMT-(UPTIMT-UMTIPT)ΔUMT。
preferably, in step S003, assuming that a fault occurs on the PT branch, the ranging function is:
wherein the content of the first and second substances,
B1＝2(UMTINT-UNTIMT)ΔINTZ-2(ΔUMTΔINT-ΔUNTΔIMT)INTZ，
C1＝(ΔUMTΔINT-ΔUNTΔIMT)UNT-(UMTINT-UNTIMT)ΔUNT，
A2＝(ΔUNTΔIMT-ΔUMTΔINT)(2UPTIMT+UMTIPT)-(UNTIMT-UMTINT)(2ΔUPTΔIMT+ΔUMTΔIPT)，
B2＝2(UNTIMT-UMTINT)ΔIMTZ-2(ΔUNTΔIMT-ΔUMTΔINT)IMTZ，
C2＝(ΔUNTΔIMT-ΔUMTΔINT)UMT-(UNTIMT-UMTINT)ΔUMT。
5. the T-type high-voltage transmission line non-synchronous fault location method of claim 1, characterized in that: the method for measuring the distance of the asynchronous fault of the T-shaped high-voltage transmission line also comprises an auxiliary criterion for verifying the correctness of data, namely the distance between an imaginary fault point of a non-fault branch and a T node
Distance from fault point of fault branch to T node
Introducing an auxiliary criterion function:
wherein f is a modulo function; if f is<Then the distance between the fault point and the T node is calculated to be effective; if f is>If so, performing reinforced filtering on the data of the three ends, and recalculating; when the distances from the virtual fault points on the two or three solved branches to the T node are all satisfied
When, if f<Then, the actual fault is the T node fault; if f>Then the data of the three terminals is reinforced and filtered to be recalculated.
6. The utility model provides a T type high tension transmission line asynchronous fault ranging system which characterized in that: the system comprises a data input module, a data extraction module, a ranging function calculation module and a numerical analysis module, wherein the data input module is used for inputting voltage and current data of M, N, P three-terminal measuring points into the system; the data extraction module is used for filtering voltage and current data of the measuring points, extracting fundamental phasor, solving a positive sequence component and a positive sequence fault component of three ends by using a symmetric component method, and outputting the positive sequence component and the positive sequence fault component of the three ends to the ranging function calculation module; the distance measurement function calculation module is used for calculating the distance from the virtual fault point to the T node on the three branches; and the numerical analysis module is used for analyzing the distance from the supposed fault point to the T node, verifying the correctness of the data through auxiliary criteria and obtaining a fault branch and a fault distance.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114047408A (en) * | 2022-01-17 | 2022-02-15 | 广东电网有限责任公司佛山供电局 | High-precision fault location method for power transmission line and related device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090150099A1 (en) * | 2005-09-14 | 2009-06-11 | Przemyslaw Balcerek | Method for fault location in electric power lines |
| CN105652151A (en) * | 2015-12-30 | 2016-06-08 | 武汉大学 | Line parameter detection and data non synchronous verification-based double-end ranging method |
| CN105929302A (en) * | 2016-04-13 | 2016-09-07 | 上海交通大学 | Sequence component relation based range finding method for single-end fault of power transmission line |
| CN107202936A (en) * | 2017-05-04 | 2017-09-26 | 许继集团有限公司 | A kind of T-link fault distance measurement |
| CN107271841A (en) * | 2017-05-27 | 2017-10-20 | 天津大学 | The T-shaped fault positioning method for transmission line of common-tower double-return based on forward-order current difference |
| CN108362978A (en) * | 2018-03-08 | 2018-08-03 | 国网山东省电力公司滨州供电公司 | A kind of T-type power transmission line fault locating method based on range function phase characteristic |
-
2020
- 2020-07-15 CN CN202010680858.2A patent/CN111781468B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090150099A1 (en) * | 2005-09-14 | 2009-06-11 | Przemyslaw Balcerek | Method for fault location in electric power lines |
| CN105652151A (en) * | 2015-12-30 | 2016-06-08 | 武汉大学 | Line parameter detection and data non synchronous verification-based double-end ranging method |
| CN105929302A (en) * | 2016-04-13 | 2016-09-07 | 上海交通大学 | Sequence component relation based range finding method for single-end fault of power transmission line |
| CN107202936A (en) * | 2017-05-04 | 2017-09-26 | 许继集团有限公司 | A kind of T-link fault distance measurement |
| CN107271841A (en) * | 2017-05-27 | 2017-10-20 | 天津大学 | The T-shaped fault positioning method for transmission line of common-tower double-return based on forward-order current difference |
| CN108362978A (en) * | 2018-03-08 | 2018-08-03 | 国网山东省电力公司滨州供电公司 | A kind of T-type power transmission line fault locating method based on range function phase characteristic |
Non-Patent Citations (3)
| Title |
|---|
| A. LIPSKY1 等: ""Improving the Accuracy of Fault Detection Location"", 《EUROCON 2013*1-4 JULY 2013 * ZAGREB, CROATIA》 * |
| 施世鸿 等: ""T 型输电线路非同步数据"", 《电力自动化设备》 * |
| 陈旭 等: ""基于相位特性的高压输电线路双端非同步故障测距算法"", 《电力***自动化》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114047408A (en) * | 2022-01-17 | 2022-02-15 | 广东电网有限责任公司佛山供电局 | High-precision fault location method for power transmission line and related device |
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