CN111665419A - T-connection line fault single-terminal ranging method and system based on wave head symmetry - Google Patents

T-connection line fault single-terminal ranging method and system based on wave head symmetry Download PDF

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CN111665419A
CN111665419A CN202010718567.8A CN202010718567A CN111665419A CN 111665419 A CN111665419 A CN 111665419A CN 202010718567 A CN202010718567 A CN 202010718567A CN 111665419 A CN111665419 A CN 111665419A
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fault
point
distance
wave
head
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张元龙
方正云
郭征南
马御棠
卫星舟
梁倩
潘浩
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Honghe Power Supply Bureau of Yunnan Power Grid Co Ltd
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Honghe Power Supply Bureau of Yunnan Power Grid Co Ltd
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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
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Abstract

The invention relates to a T-connection line fault single-terminal location method based on wave head symmetry, and belongs to the technical field of power system relay protection. Firstly, collecting a first wave head of a fault point voltage of each measuring point and reflected wave heads of buses M, N at the other two ends; then, determining a fault line according to the symmetry of the arrival time; if the corresponding time can be found, the fault is in the local line, otherwise, the fault is not in the local line. The method and the device perform fault branch positioning by utilizing the time symmetry of the first wave head of the transient zero sequence voltage of the line when a fault occurs and the reflected wave heads of the other two buses M, N reaching the observation point, can accurately find out the fault position, have simple and effective principle, are greatly beneficial to positioning the fault of the long-distance power transmission line, and are easy to popularize and apply.

Description

T-connection line fault single-terminal ranging method and system based on wave head symmetry
Technical Field
The invention belongs to the technical field of power system relay protection, and particularly relates to a T-connection line fault single-terminal distance measurement method and system based on wave head symmetry.
Background
Nowadays, the development of national economy depends on higher and higher electric energy sources, the demand of electricity consumption is higher and higher, and the power network becomes more huge. The rapid development of the power grid leads to the shortage of line corridor resources, and the application of the T-connection power transmission line reduces the occupation of the corridor resources to a certain extent. Meanwhile, compared with the traditional double-end transmission line, when the T-connection transmission line has a fault, fault location for realizing a single-end traveling wave method is yet to be researched. At present, traveling wave distance measuring devices are installed on power transmission lines of a Yunnan power grid in a voltage class of more than 220kV, trial points have been started for installation of the distance measuring devices of the power transmission lines in a voltage class of 110kV, T connection lines are more and more in engineering application of the power transmission lines in the voltage class of 110kV, the T connection lines are more complex in topological structure compared with traditional double-end power transmission lines, when the T connection power transmission lines are in fault, the line patrol range is wider than that of the traditional double-end power transmission lines, the line patrol difficulty is higher, and therefore, the fact that fault signals of the T connection power transmission lines are detected through station ends to measure the distance of fault points is significant.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a T-connection line fault single-end distance measurement method and a T-connection line fault single-end distance measurement system based on wave head symmetry.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the T-connection line fault single-terminal location method based on wave head symmetry comprises the following steps:
respectively setting M, N, P as three end points of the T-shaped wiring transmission line, wherein the three end points are power supply access points and can be observed, and the cross point is T;
collecting the first wave head of the transient zero-mode voltage of each feeder line after the fault reaches an observation point and the reflected waves of buses at the other two ends;
for single-end ranging of a T-shaped wiring power transmission line, a T-shaped line is equivalent to three lines: MT, TP, TN are each l in lengthMT、lTP、lNT；
Taking the P point as an observation point, firstly obtaining the arrival time t of the head wave of the fault point for the observed waveform1According to
Figure BDA0002599115040000011
Calculating to obtain a distance L; wherein v represents the wave velocity; then obtaining the arrival time t of the reflected waves of the rest two-end buses M and N2、t3；
Figure BDA0002599115040000021
Figure BDA0002599115040000022
If t2、t3Respectively with t1About
Figure BDA0002599115040000023
And
Figure BDA0002599115040000024
if the fault point is symmetrical, the fault point is confirmed to be on the TP line section, the length of the distance P point is L, and otherwise, the fault point is located in the MTN branch circuit;
any one of the other two points M, N is taken as an observation point to obtain the arrival time t of the head wave head of the fault point4According to t4×v＝L1To calculate the distance L corresponding to the time1(ii) a When the distance L is1If the distance between the observation point and the intersection is larger than the distance between the observation point and the intersection, the fault is judged to be on the branch from the intersection to the other two points of the other two points, and the distance-L between the fault and the other two points of the observation point is1(ii) a Otherwise, on the branch from the observation point to the cross point, the length of the fault from the observation point is L1。
Further, it is preferable that the transient zero mode voltage is calculated as follows:
Figure BDA0002599115040000025
Ua、Ub、Ucrespectively representing three phase voltages.
Further, it is preferable that the collected transient zero-mode voltage of each feeder line after the fault reaches the head wave and the reflected waves of the buses at the other two ends of the observation point, and the sampling rate is 10 kHz.
Further, preferably, M points are taken as observation points, and the arrival time t of the head wave at the fault point is obtained4According to t4×v＝L1To calculate the distance L corresponding to the time1(ii) a When the distance L is1If the distance is greater than the distance of the MT section, the fault is judged to be in the TN section, otherwise, the fault is in the MT section;
if in the MT section, the length of the fault distance M point is L1In TN section, the length of the fault distance M point is lMTN-L1(ii) a Wherein lMTNIs the length of the MTN leg.
The invention also provides a T-connection line fault single-end distance measurement system based on wave head symmetry, which comprises:
the data acquisition module is used for acquiring the head wave and the reflected waves of the rest two-end bus of the transient zero-mode voltage of each feeder line reaching the observation point after the fault;
the first processing module is used for taking the point P as an observation point and firstly obtaining the arrival time t of the head wave of the fault point on the observed waveform1According to
Figure BDA0002599115040000026
Calculating to obtain a distance L; wherein v represents the wave velocity; then obtaining the arrival time t of the reflected waves of the rest two-end buses M and N2、t3；
A first fault location module for if t2、t3Respectively with t1About
Figure BDA0002599115040000031
And
Figure BDA0002599115040000032
if the fault point is symmetrical, the fault point is confirmed to be on the TP line section, the length of the distance P point is L, and otherwise, the fault point is located in the MTN branch circuit;
a second fault distance measurement module for obtaining the arrival time t of the head wave head of the fault point by taking any one of the other two points M, N as an observation point4According to t4×v＝L1To calculate the distance L corresponding to the time1(ii) a When the distance L is1If the distance between the observation point and the intersection is larger than the distance between the observation point and the intersection, the fault is judged to be on the branch from the intersection to the other two points of the other two points, and the distance-L between the fault and the other two points of the observation point is1(ii) a Otherwise, on the branch from the observation point to the cross point, the length of the fault from the observation point is L1。
The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, and is characterized in that the processor executes the program to realize the steps of the T-connection line fault single-ended distance measurement method based on wave head symmetry.
The present invention additionally provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when being executed by a processor, implements the steps of the above-mentioned T-junction line fault single-ended ranging method based on wave-head symmetry.
If the measuring point M is taken as the measuring point at the home end, the measuring points N and P are the measuring points at the other two ends;
in the invention, 3 end points can be measured, and one measuring point is selected to respectively find the time symmetrical about the arrival time of the head wave head, so that the fault can be found on the selected branch. The fault position can be calculated from one measuring point, and the correctness of the calculation is checked through the other two measuring points.
The invention determines the fault branch circuit according to the symmetry, and separately considers two branch circuits of MTP and PTN, the schematic diagram is as shown in the following figure 3, and the calculation formula is as follows:
Figure BDA0002599115040000033
Figure BDA0002599115040000034
Figure BDA0002599115040000035
in the formula, L represents the transmission distance of the head wave head; t is t1、t2、t3Representing the arrival time of the head wave head of the fault point and the arrival time of the reflected waves of the buses M and N at the other two ends, and obviously showing t2And t3Respectively with t1About
Figure BDA0002599115040000041
And
Figure BDA0002599115040000042
and (4) symmetry.
The method adopts a single-end method, accurately positions wave heads in a T-shaped line by using symmetry, identifies an initial traveling wave head of a fault point reaching a station end and a reflected wave of the fault point through a fault traveling wave signal measured by a single-side station end of the power transmission line after the power transmission line has a fault, and calculates the accurate position of the power transmission line having the fault through whether the two wave heads are symmetrical or not and the traveling wave speed. The method does not require time synchronization of the three measuring ends. On the basis of the calculation principle, the influences of transition impedance, load current, system operation mode and the like are eliminated.
Compared with the prior art, the invention has the beneficial effects that:
1. the fault location is carried out by utilizing the symmetry of the fault point zero-mode voltage of the fault branch circuit and the time of transmitting the reflected wave zero-mode voltage of the other two ends to the measuring point when the fault occurs, the fault branch circuit can be accurately located, the operation is simple and convenient, and the method is greatly beneficial to a power grid of a T-connection network.
2. The T node is taken as a center, N, M, P three points can be respectively used as observation points, if a symmetrical wave head position cannot be found on the TP section, a fault is certain on the MTN section, the MTP branch is analyzed by a method for comparing the distance with the length of the MT section, and compared with other methods for distinguishing fault potentials, the difference between a fault branch and a healthy branch can be embodied more intuitively, so that the fault branch can be selected more quickly.
Drawings
FIG. 1 is a diagram of a T-junction power transmission line according to the present invention;
FIG. 2 is an exploded view of the T-connector of the present invention;
FIG. 3 is a schematic diagram illustrating the time symmetry of the present invention;
FIG. 4 is a diagram of zero-mode voltage arrival time observed at a test point P after a fault occurs in a branch of a TP segment (end M) according to the present invention;
FIG. 5 is a diagram of zero-mode voltage arrival time observed at a test point P after a fault occurs in a branch of a TP segment (N-terminal) according to the present invention;
FIG. 6 is a schematic structural diagram of a T-junction line fault single-ended distance measurement system based on wave head symmetry according to the present invention;
FIG. 7 is a schematic structural diagram of an electronic device according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The materials or equipment used are not indicated by manufacturers, and all are conventional products available by purchase.
Example 1
The T-connection line fault single-terminal location method based on wave head symmetry comprises the following steps:
respectively setting M, N, P as three end points of the T-shaped wiring transmission line, wherein the three end points are power supply access points and can be observed, and the cross point is T;
collecting the first wave head of the transient zero-mode voltage of each feeder line after the fault reaches an observation point and the reflected waves of buses at the other two ends;
for single-end ranging of a T-shaped wiring power transmission line, a T-shaped line is equivalent to three lines: MT, TP, TN are each l in lengthMT、lTP、lNT；
Taking the P point as an observation point, firstly obtaining the arrival time t of the head wave of the fault point for the observed waveform1According to
Figure BDA0002599115040000051
Calculating to obtain a distance L; wherein v represents the wave velocity; then obtaining the arrival time t of the reflected waves of the rest two-end buses M and N2、t3；
Figure BDA0002599115040000052
Figure BDA0002599115040000053
If t2、t3Respectively with t1About
Figure BDA0002599115040000056
And
Figure BDA0002599115040000054
if the fault point is symmetrical, the fault point is confirmed to be on the TP line section, the length of the distance P point is L, and otherwise, the fault point is located in the MTN branch circuit;
any one of the other two points M, N is taken as an observation point to obtain the arrival time t of the head wave head of the fault point4According to t4×v＝L1To calculate the distance L corresponding to the time1(ii) a When the distance L is1If the distance between the observation point and the intersection is larger than the distance between the observation point and the intersection, the fault is judged to be on the branch from the intersection to the other two points of the other two points, and the distance-L between the fault and the other two points of the observation point is1(ii) a Otherwise, on the branch from the observation point to the cross point, the length of the fault from the observation point is L1。
Example 2
A single-phase earth fault is arranged on a branch line of a T-shaped structure power grid along a line through electromagnetic transient simulation to serve as a fault branch line, and zero-mode line mode voltage U after fault is collected at a measuring point0；
Figure BDA0002599115040000055
Ua、Ub、UcRespectively representing three phase voltages.
And collecting zero-mode voltage after the fault and reflected waves of buses at the other two ends, wherein the sampling rate is 10 kHz. The invention determines the fault branch circuit according to the symmetry, and separately considers two branch circuits of MTP and PTN, the schematic diagram is as shown in the following figure 3, and the calculation formula is as follows:
Figure BDA0002599115040000061
Figure BDA0002599115040000062
Figure BDA0002599115040000063
in the formula, L represents the transmission distance of the head wave head; t is t1、t2、t3Representing the arrival time of the head wave head of the fault point and the arrival time of the reflected waves of the buses M and N at the other two ends, and obviously showing t2And t3Respectively with t1About
Figure BDA0002599115040000064
And
Figure BDA0002599115040000065
and (4) symmetry.
Taking the P point as an observation point, firstly confirming the arrival time t of the first wave head of the observed waveform1According to t1A distance L is obtained which may be any position of the failure point on MT, TP and TN. If there is a time t on the waveform2And t3Corresponding wave head, and the two times are respectively corresponding to t1About
Figure BDA0002599115040000066
And
Figure BDA0002599115040000067
and if the fault point is symmetrical, the fault point is confirmed to be on the TP line section, and the distance from the point P is L. If the fault point does not exist, the fault point is not on the TP segment, and an observation point is changed for observation.
If the matching cannot be obtained, the fault point can be determined to be positioned in the MTN branch, a zero mode waveform diagram of the M end is analyzed, and when a first wave head appears, the distance L corresponding to the time1A distance greater than the MT leg indicates that the fault is in the TN leg, otherwise in the MT leg. If in the MT section, the fault distance M point is L1In TN section, the fault distance M is lMTN-L1。
As shown in fig. 6, the present invention also provides a T-junction line fault single-ended distance measurement system based on wave head symmetry, which includes:
the data acquisition module 101 is used for acquiring the head wave and the reflected waves of the rest two-end bus when the transient zero-mode voltage of each feeder line reaches an observation point after the fault occurs;
a first processing module 102, configured to use the point P as an observation point, and obtain, for an observed waveform, a time t of arrival of a head wave at a fault point1According to
Figure BDA0002599115040000071
Calculating to obtain the distanceL; wherein v represents the wave velocity; then obtaining the arrival time t of the reflected waves of the rest two-end buses M and N2、t3；
A first fault location module 103 for if t2、t3Respectively with t1About
Figure BDA0002599115040000072
And
Figure BDA0002599115040000073
if the fault point is symmetrical, the fault point is confirmed to be on the TP line section, the length of the distance P point is L, and otherwise, the fault point is located in the MTN branch circuit;
a second fault location module 104, configured to use any one of the other two points M, N as an observation point to obtain the time t of the arrival of the head wave at the fault point4According to t4×v＝L1To calculate the distance L corresponding to the time1(ii) a When the distance L is1If the distance between the observation point and the intersection is larger than the distance between the observation point and the intersection, the fault is judged to be on the branch from the intersection to the other two points of the other two points, and the distance-L between the fault and the other two points of the observation point is1(ii) a Otherwise, on the branch from the observation point to the cross point, the length of the fault from the observation point is L1。
In the embodiment of the invention, the data acquisition module 101 acquires the first wave head of the transient zero-mode voltage of each feeder line reaching the observation point and the reflected waves of the buses at the other two ends after the fault; then, the first processing module 102 is configured to use the point P as an observation point, and obtain, for an observed waveform, a time t of arrival of a head wave at a fault point first1According to
Figure BDA0002599115040000074
Calculating to obtain a distance L; wherein v represents the wave velocity; then obtaining the arrival time t of the reflected waves of the rest two-end buses M and N2、t3(ii) a Then, a first fault location module 103 for determining if t2、t3Respectively with t1About
Figure BDA0002599115040000076
And
Figure BDA0002599115040000075
if the fault point is symmetrical, the fault point is confirmed to be on the TP line section, the length of the distance P point is L, and otherwise, the fault point is located in the MTN branch circuit; finally, the second fault location module 104 is configured to use any one of the other two points M, N as an observation point to obtain the time t of the arrival of the head wave at the fault point4According to t4×v＝L1To calculate the distance L corresponding to the time1(ii) a When the distance L is1If the distance between the observation point and the intersection is larger than the distance between the observation point and the intersection, the fault is judged to be on the branch from the intersection to the other two points of the other two points, and the distance-L between the fault and the other two points of the observation point is1(ii) a Otherwise, on the branch from the observation point to the cross point, the length of the fault from the observation point is L1。
According to the T-connection line fault single-end distance measurement system based on wave head symmetry, provided by the embodiment of the invention, fault location can be carried out by utilizing the symmetry of the fault point zero-mode voltage of the fault branch circuit and the time for transmitting the residual two-end reflected wave zero-mode voltage to the measurement point when a fault occurs, the fault branch circuit can be accurately located, the operation is simple and convenient, and the T-connection line fault single-end distance measurement system is greatly beneficial to a power grid of a T-connection network.
The system provided by the embodiment of the present invention is used for executing the above method embodiments, and for details of the process and the details, reference is made to the above embodiments, which are not described herein again.
Fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and referring to fig. 7, the electronic device may include: a processor (processor)201, a communication Interface (communication Interface)202, a memory (memory)203 and a communication bus 204, wherein the processor 201, the communication Interface 202 and the memory 203 complete communication with each other through the communication bus 204. The processor 201 may call logic instructions in the memory 203 to perform the following method: collecting the first wave head of the transient zero-mode voltage of each feeder line after the fault reaches an observation point and the reflected waves of buses at the other two ends; taking the P point as an observation point, firstly obtaining the arrival time t of the head wave of the fault point for the observed waveform1According to
Figure BDA0002599115040000081
Calculating to obtain a distance L; wherein v represents the wave velocity; then obtaining the arrival time t of the reflected waves of the rest two-end buses M and N2、t3(ii) a If t2、t3Respectively with t1About
Figure BDA0002599115040000082
And
Figure BDA0002599115040000083
if the fault point is symmetrical, the fault point is confirmed to be on the TP line section, the length of the distance P point is L, and otherwise, the fault point is located in the MTN branch circuit; any one of the other two points M, N is taken as an observation point to obtain the arrival time t of the head wave head of the fault point4According to t4×v＝L1To calculate the distance L corresponding to the time1(ii) a When the distance L is1If the distance between the observation point and the intersection is larger than the distance between the observation point and the intersection, the fault is judged to be on the branch from the intersection to the other two points of the other two points, and the distance-L between the fault and the other two points of the observation point is1(ii) a Otherwise, on the branch from the observation point to the cross point, the length of the fault from the observation point is L1。
In addition, the logic instructions in the memory 203 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program is implemented to perform the T-wire fault single-ended distance measurement method based on wave-head symmetry provided in the foregoing embodiments, for example, the method includes: collecting the first wave head of the transient zero-mode voltage of each feeder line after the fault reaches an observation point and the reflected waves of buses at the other two ends; taking the P point as an observation point, firstly obtaining the arrival time t of the head wave of the fault point for the observed waveform1According to
Figure BDA0002599115040000091
Calculating to obtain a distance L; wherein v represents the wave velocity; then obtaining the arrival time t of the reflected waves of the rest two-end buses M and N2、t3(ii) a If t2、t3Respectively with t1About
Figure BDA0002599115040000092
And
Figure BDA0002599115040000093
if the fault point is symmetrical, the fault point is confirmed to be on the TP line section, the length of the distance P point is L, and otherwise, the fault point is located in the MTN branch circuit; any one of the other two points M, N is taken as an observation point to obtain the arrival time t of the head wave head of the fault point4According to t4×v＝L1To calculate the distance L corresponding to the time1(ii) a When the distance L is1If the distance between the observation point and the intersection is larger than the distance between the observation point and the intersection, the fault is judged to be on the branch from the intersection to the other two points of the other two points, and the distance-L between the fault and the other two points of the observation point is1(ii) a Otherwise, on the branch from the observation point to the cross point, the length of the fault from the observation point is L1。
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Examples of the applications
A 10.5kV/110kV T-type structure power grid simulation model is shown in fig. 1, which has 4 nodes, M, N, P is taken as an observation point, a line TP section has a ground fault, and power supply operating phase angles of the observation points are respectively set as: 0 °, 180 °. The conductor type is selected to be LGJ-185/30, three-phase conductor horizontal arrangement structure.
(1) Setting single-phase earth faults between TP sections in a T-shaped structure power grid, setting 10 omega transition resistors, respectively acquiring three-phase voltages of lines at protective installation positions of observation points, and observing arrival time T of zero-voltage first wave heads of the fault points1And arrival time t of zero-voltage reflected wave of the other two-end bus M, N2And t3。
(2) Finding t1And t2And t1And t3The symmetric time of (2) is shown in the following fig. 4 and fig. 5, which respectively show the time from the zero-mode voltage reflected wave of the M measuring point and the N measuring point to the measuring point P, and the time of the symmetric axis is 205.05ms and 205.15ms respectively.
(3) Fault location: the distance between the TP section and a P point in the T-shaped line is 30 km; suppose the fault start time is 204.8 ms; the sampling frequency was 10 kHz.
From fig. 4 and 5, it is apparent that there is a wave head corresponding to the head wave head at symmetrical time, so that the distance that the head wave head reacts to can be determined as the position of the fault point distance P, t1The time is 204.9ms, the data is transmitted to a measuring point P after 0.1ms, the optical speed v is multiplied by 300km/ms, the fault position is calculated, and the distance P point is 30km, which is consistent with the fault setting. The application sets the fault in the TP section, and takes the P point as a measuring point, so that the verification can be performed without using another two points.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (7)

1. The T-connection line fault single-terminal location method based on wave head symmetry is characterized by comprising the following steps:
respectively setting M, N, P as three end points of the T-shaped wiring transmission line, wherein the three end points are power supply access points and can be observed, and the cross point is T;
collecting the first wave head of the transient zero-mode voltage of each feeder line after the fault reaches an observation point and the reflected waves of buses at the other two ends;
for single-end ranging of a T-shaped wiring power transmission line, a T-shaped line is equivalent to three lines: MT, TP, TN are each l in lengthMT、lTP、lNT；
Taking the P point as an observation point, firstly obtaining the arrival time t of the head wave of the fault point for the observed waveform1According to
Figure FDA0002599115030000011
Calculating to obtain a distance L; wherein v represents the wave velocity; thereafter obtaining itTime t of arrival of reflected waves of buses M and N at the other two ends2、t3；
Figure FDA0002599115030000012
Figure FDA0002599115030000013
If t2、t3Respectively with t1About
Figure FDA0002599115030000014
And
Figure FDA0002599115030000015
if the fault point is symmetrical, the fault point is confirmed to be on the TP line section, the length of the distance P point is L, and otherwise, the fault point is located in the MTN branch circuit;
any one of the other two points M, N is taken as an observation point to obtain the arrival time t of the head wave head of the fault point4According to t4×v＝L1To calculate the distance L corresponding to the time1(ii) a When the distance L is1If the distance between the observation point and the intersection is larger than the distance between the observation point and the intersection, the fault is judged to be on the branch from the intersection to the other two points of the other two points, and the distance-L between the fault and the other two points of the observation point is1(ii) a Otherwise, on the branch from the observation point to the cross point, the length of the fault from the observation point is L1。
2. The method for single-ended distance measurement of the fault of the T-connection line based on the wave-head symmetry as claimed in claim 1, wherein the transient zero-mode voltage is calculated according to the following formula:
Figure FDA0002599115030000016
Ua、Ub、Ucrespectively representing three phase voltages.
3. The T-connection line fault single-end ranging method based on wave head symmetry as claimed in claim 1, wherein the first wave head and the reflected waves of buses at the other two ends of the head of the transient zero-mode voltage of each feeder line after the fault is collected and the sampling rate is 10 kHz.
4. The T-connection line fault single-terminal ranging method based on wave head symmetry as claimed in claim 1, wherein M point is taken as an observation point, and time T of arrival of first wave head of fault point is obtained4According to t4×v＝L1To calculate the distance L corresponding to the time1(ii) a When the distance L is1If the distance is greater than the distance of the MT section, the fault is judged to be in the TN section, otherwise, the fault is in the MT section;
if in the MT section, the length of the fault distance M point is L1In TN section, the length of the fault distance M point is lMTN-L1(ii) a Wherein lMTNIs the length of the MTN leg.
5. T line trouble single-ended range finding system based on wave head symmetry, its characterized in that includes:
the data acquisition module is used for acquiring the head wave and the reflected waves of the rest two-end bus of the transient zero-mode voltage of each feeder line reaching the observation point after the fault;
the first processing module is used for taking the point P as an observation point and firstly obtaining the arrival time t of the head wave of the fault point on the observed waveform1According to
Figure FDA0002599115030000021
Calculating to obtain a distance L; wherein v represents the wave velocity; then obtaining the arrival time t of the reflected waves of the rest two-end buses M and N2、t3；
A first fault location module for if t2、t3Respectively with t1About
Figure FDA0002599115030000022
And
Figure FDA0002599115030000023
if the fault point is symmetrical, the fault point is confirmed to be on the TP line section, the length of the distance P point is L, and otherwise, the fault point is located in the MTN branch circuit;
a second fault distance measurement module for obtaining the arrival time t of the head wave head of the fault point by taking any one of the other two points M, N as an observation point4According to t4×v＝L1To calculate the distance L corresponding to the time1(ii) a When the distance L is1If the distance between the observation point and the intersection is larger than the distance between the observation point and the intersection, the fault is judged to be on the branch from the intersection to the other two points of the other two points, and the distance-L between the fault and the other two points of the observation point is1(ii) a Otherwise, on the branch from the observation point to the cross point, the length of the fault from the observation point is L1。
6. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the steps of the method for single-ended fault location of a T-wire based on header symmetry according to any of claims 1 to 4.
7. A non-transitory computer readable storage medium, having stored thereon a computer program, wherein the computer program, when being executed by a processor, implements the steps of the method for single-ended ranging of a T-wire fault based on wave-head symmetry according to any one of claims 1 to 4.
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