CN-122017445-A - Power distribution network line fault positioning method, system, terminal and storage medium

CN122017445ACN 122017445 ACN122017445 ACN 122017445ACN-122017445-A

Abstract

The application discloses a power distribution network line fault positioning method, a system, a terminal and a storage medium, and belongs to the technical field of power distribution networks; the method comprises the steps of receiving second traveling wave head information sent by a second terminal, judging whether the fault position of the fault is in a power distribution network line section according to the first traveling wave head information and the second traveling wave head information if the first fault and the second fault are the same fault, determining the fault position of the fault according to the first traveling wave head information, the second traveling wave head information, traveling wave propagation speed and line length of the power distribution network line section if the fault position of the fault is in the power distribution network line section, and realizing that the fault position of the power distribution network line fault can be accurately positioned through interactive communication between local terminals without depending on a master station.

Inventors

YANG JIAN
XU JUN
SUN QUAN
YANG JINJIN
TANG FEITING

Assignees

北京和信瑞通电力技术股份有限公司
正泰电气股份有限公司

Dates

Publication Date: 20260512
Application Date: 20251027

Claims (10)

1. A power distribution network line fault positioning method applied to a first terminal installed on one side of a power distribution network line, and a second terminal installed on the other side of the power distribution network line, the method comprising: Judging whether a first fault occurs in the power distribution network line or not according to a first electric signal at one side of the power distribution network line, and if the first fault occurs, determining corresponding first line wave head information according to a first moment of the first fault and a second electric signal at one side of the power distribution network line; Receiving second traveling wave head information sent by the second terminal, wherein the second traveling wave head information is determined by the second terminal according to a second moment of the second fault and a fourth electric signal at the other side of the power distribution network line after judging that the power distribution network line has the second fault according to a third electric signal at the other side of the power distribution network line; if the first fault and the second fault are the same fault, determining whether the fault is in a power distribution network line section according to the first traveling wave head information and the second traveling wave head information, wherein the power distribution network line section is a power distribution network line between the first terminal and the second terminal; And if the fault is in the power distribution network line section, determining a fault position of the fault according to the first traveling wave head information, the second traveling wave head information, the traveling wave propagation speed and the line length of the power distribution network line section.
2. The method of claim 1, wherein the first electrical signal comprises a first three-phase voltage and a first three-phase current; Judging whether the power distribution network line has a first fault according to a first electric signal at one side of the power distribution network line, including: if the first three-phase current is subjected to continuous current mutation, determining that a first fault occurs in the power distribution network line, and determining a first moment corresponding to the first fault; if the first three-phase current does not generate continuous current mutation and the first three-phase voltage generates continuous voltage mutation, determining that a first fault occurs in the power distribution network line, and determining a first moment corresponding to the first fault.
3. The method of claim 1, wherein the second electrical signal comprises a first three-phase traveling wave current, wherein the first traveling wave header information comprises a first traveling wave header time stamp, wherein the determining the corresponding first traveling wave header information based on the first time of the first fault and the second electrical signal on the line side of the distribution network comprises: Sampling the first three-phase traveling wave current at one side of the power distribution network line to obtain a corresponding first three-phase traveling wave current data set, wherein the first three-phase traveling wave current data set comprises a current value of the first three-phase traveling wave current within a first preset duration and a corresponding sampling time scale; Determining a first target sampling time scale corresponding to the first three-phase traveling wave current data set according to the first time; Determining a first three-phase traveling wave current data subset corresponding to the first three-phase traveling wave current data set according to the first target sampling time scale, wherein the first three-phase traveling wave current data subset is a current value and a corresponding sampling time scale of a first three-phase traveling wave current from the first target sampling time scale to a second preset time period before the first target sampling time scale in the first three-phase traveling wave current data set, and the second preset time period is smaller than or equal to the first preset time period; and determining a sampling time scale corresponding to the maximum current value in the first three-phase traveling wave current data subset as the first traveling wave head time scale.
4. The method of claim 1, wherein if the first fault and the second fault are the same fault, comprising: and if the second traveling wave head information sent by the second terminal is received within a third preset time period from the first moment to the back, determining that the first fault and the second fault are the same fault.
5. The method of claim 3, wherein the second traveling wave header information includes a second traveling wave header time stamp, and wherein the determining whether the fault is within a distribution network line segment based on the first traveling wave header information and the second traveling wave header information comprises: Determining a first traveling wave ranging result of the fault distance from the first terminal according to the first traveling wave head time mark, the second traveling wave head time mark, the traveling wave propagation speed and the line length of the power distribution network line section; And if the first traveling wave distance measurement result is smaller than the line length, determining that the fault is in the power distribution network line section.
6. The method of claim 5, further comprising transmitting the first traveling wave head time stamp to the second terminal to cause the second terminal to determine a second traveling wave ranging result for the fault distance from the second terminal based on the second traveling wave head time stamp, the first traveling wave head time stamp, the traveling wave propagation velocity, and the line length; The determining the fault location of the fault according to the first traveling wave head information, the second traveling wave head information, the traveling wave propagation speed and the line length of the power distribution network line section includes: receiving the second travelling wave ranging result sent by the second terminal; Determining a corresponding ranging compensation value according to the first traveling wave ranging result, the second traveling wave ranging result and the line length; and determining the fault position of the fault according to the first line wave ranging result and the ranging compensation value.
7. A power distribution network line fault locating method, applied to a second terminal installed on the other side of a power distribution network line, wherein a first terminal is installed on one side of the power distribution network line, the method comprising: Judging whether a second fault occurs in the power distribution network line according to a third electric signal on the other side of the power distribution network line, and if the second fault occurs, determining corresponding second traveling wave head information according to a fourth electric signal on the other side of the power distribution network line and a second moment of the second fault; Receiving first traveling wave head information sent by the first terminal, wherein the first traveling wave head information is determined by the first terminal according to a first moment of a first fault and a second electric signal at one side of the power distribution network line after the first terminal judges that the power distribution network line has the first fault according to a first electric signal at one side of the power distribution network line; If the first fault and the second fault are the same fault, determining whether the fault is in a power distribution network line section according to the second traveling wave head information and the first traveling wave head information, wherein the power distribution network line section is a power distribution network line between the second terminal and the first terminal; and if the fault is in the power distribution network line section, determining the fault position of the fault according to the second traveling wave head information, the first traveling wave head information, the traveling wave propagation speed and the line length of the power distribution network line section.
8. A distribution network line fault location system for a first terminal installed on one side of a distribution network line, a second terminal installed on the other side of the distribution network line, comprising: The wave head determining module is used for judging whether the power distribution network circuit has a first fault or not according to a first electric signal at one side of the power distribution network circuit, and if the first fault has the first fault, determining corresponding first line wave head information according to a first moment of the first fault and a second electric signal at one side of the power distribution network circuit; The information receiving module is used for receiving second traveling wave head information sent by the second terminal, wherein the second traveling wave head information is determined by the second terminal according to a second moment of the second fault and a fourth electric signal at the other side of the power distribution network line after judging that the power distribution network line has the second fault according to a third electric signal at the other side of the power distribution network line; The fault judging module is used for determining whether the fault is in a power distribution network line section according to the first traveling wave head information and the second traveling wave head information if the first fault and the second fault are the same fault, wherein the power distribution network line section is a power distribution network line between the first terminal and the second terminal; And the fault positioning module is used for determining the fault position of the fault according to the first traveling wave head information, the second traveling wave head information, the traveling wave propagation speed and the line length of the power distribution network line section if the fault is in the power distribution network line section.
9. A terminal comprising a sampling assembly, a memory and a processor, wherein the sampling assembly and the memory are both connected to the processor, the sampling assembly is configured to sample an electrical signal of a power distribution network, the memory has a computer program stored thereon, and the computer program when executed by the processor implements the method of any of claims 1-7.
10. A computer readable storage medium, characterized in that it has stored thereon a computer program, which is loaded by a processor to perform the steps in the method of any of claims 1-7.

Description

Power distribution network line fault positioning method, system, terminal and storage medium Technical Field The application relates to the technical field of power distribution networks, in particular to a power distribution network line fault positioning method, a system, a terminal and a storage medium. Background As the demand for power grows, the distribution network becomes more and more complex, and the number of faults in the distribution network also increases. The urban distribution network is connected by multiple T joints, a radial distribution network is formed, the branches of the urban distribution network are more, the refraction and reflection paths of the traveling wave are complex, the capturing of the traveling wave is difficult, and the conventional single-ended traveling wave ranging method is difficult to meet the requirement of rapid and accurate positioning of faults of the existing distribution network. In the prior art, a double-end traveling wave distance measurement method is proposed, the fault point position is calculated by installing traveling wave detection equipment at two ends of a power distribution network line and detecting the time difference that a first traveling wave reaches the two ends, but the double-end traveling wave distance measurement method needs the traveling wave detection equipment at the two ends to communicate acquired traveling wave information to the same main station system, and then the traveling wave distance measurement system of the main station system performs comprehensive analysis to position the fault point through traveling wave information sent on each side. Disclosure of Invention In view of the above problems, the present application provides a method, a system, a terminal and a storage medium for locating a power distribution network line fault, which aim to solve the above technical problems. In a first aspect, a method for locating a fault of a power distribution network line is provided, and the method is applied to a first terminal installed on one side of the power distribution network line, and a second terminal is installed on the other side of the power distribution network line, and includes: Judging whether a first fault occurs in the power distribution network line or not according to a first electric signal at one side of the power distribution network line, and if the first fault occurs, determining corresponding first line wave head information according to a first moment of the first fault and a second electric signal at one side of the power distribution network line; Receiving second traveling wave head information sent by the second terminal, wherein the second traveling wave head information is determined by the second terminal according to a second moment of the second fault and a fourth electric signal at the other side of the power distribution network line after judging that the power distribution network line has the second fault according to a third electric signal at the other side of the power distribution network line; if the first fault and the second fault are the same fault, determining whether the fault is in a power distribution network line section according to the first traveling wave head information and the second traveling wave head information, wherein the power distribution network line section is a power distribution network line between the first terminal and the second terminal; And if the fault is in the power distribution network line section, determining a fault position of the fault according to the first traveling wave head information, the second traveling wave head information, the traveling wave propagation speed and the line length of the power distribution network line section. Optionally, the first electrical signal includes a first three-phase voltage and a first three-phase current, and the judging whether the power distribution network line has a first fault according to the first electrical signal on one side of the power distribution network line includes: if the first three-phase current is subjected to continuous current mutation, determining that a first fault occurs in the power distribution network line, and determining a first moment corresponding to the first fault; if the first three-phase current does not generate continuous current mutation and the first three-phase voltage generates continuous voltage mutation, determining that a first fault occurs in the power distribution network line, and determining a first moment corresponding to the first fault. Optionally, the second electrical signal includes a first three-phase traveling wave current, the first traveling wave header information includes a first traveling wave header time scale, and the determining the corresponding first traveling wave header information according to the first time of the first fault and the second electrical signal at one side of the power distribution network line includes: Sampling the f