CN116500378B - Method for judging position of positive pole to ground short circuit fault of subway special rail reflux power supply system - Google Patents
Method for judging position of positive pole to ground short circuit fault of subway special rail reflux power supply system Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
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Abstract
The invention discloses a method for judging the position of a positive pole to ground short circuit fault of a special rail reflux power supply system for subways, and relates to the technical field of fault diagnosis of rail transit power supply systems. The method comprises the following steps: on the premise of knowing the positive pole to ground short circuit fault interval of the special subway rail reflux power supply system, acquiring data of adjacent power substations through a GOOSE network; and processing and analyzing the ground voltage data of adjacent power substations, respectively processing different faults in the line, and comparing the voltage data of two sides to obtain the specific position of the fault point. The method can realize the distance measurement of the positive pole ground short circuit fault under the special rail reflux power supply mode, accurately locate the fault point, reduce the fault removal time and improve the running stability of the power grid.
Description
Technical Field
The invention relates to the technical field of fault diagnosis of rail transit power supply systems, in particular to a method for judging the position of a positive pole-to-ground short circuit fault of a special rail reflux power supply system for subways based on GOOSE communication.
Background
As an important component of urban traffic, subways have been paid attention to safety, reliability and operation efficiency. At present, most of domestic urban rail transit adopts a low-voltage direct current power supply mode based on running rail backflow, but the biggest disadvantage of the power supply mode is that stray current leaked from a steel rail to the ground can cause electrochemical corrosion to subway tunnels, nearby building steel bars and metal pipelines. To solve this problem, domestic scholars propose a special rail return power supply technology, i.e. the power supply return flows to the traction substation through a special rail (fourth rail) without passing through the running rail.
Although the dedicated rail return supply solves this large problem of stray currents, it has its own drawbacks. That is, when the positive electrode (line) is short-circuited to ground (the positive and negative electrodes have the same insulation level to ground), the conventional dc protection cannot cut off the fault because the short-circuit current is small. The conventional method for compensating the direct current protection is to connect the negative electrode with a 5 ohm resistor in series and then to connect the negative electrode with a diode ground, as shown in fig. 1. The principle is that the earth of the positive electrode can generate leakage voltage at a 5 omega resistor, and the 64D device judges whether the positive electrode has short circuit fault or not by setting the voltage value.
After the fault interval is determined, the importance of the subway short-circuit fault distance measurement function is reflected, and the fault point can be rapidly and accurately positioned, so that the maintenance time is effectively shortened, and the normal operation of the subway is ensured. The function has very important significance for ensuring the safe and stable operation of the subway and improving the service quality of the subway. Through realizing subway short circuit fault ranging function, not only can improve subway maintenance work's efficiency, can also reduce the influence that the trouble caused to the subway operation to promote the service level of subway.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for judging the position of the positive pole ground short circuit fault of a subway special rail reflux power supply system, which can realize the distance measurement of the positive pole ground short circuit fault under the special rail reflux power supply mode and accurately locate the fault point.
In order to solve the technical problems, the invention adopts the following technical scheme: a method for judging the position of a positive pole to ground short circuit fault of a special rail reflux power supply system for subways comprises the following steps:
on the premise of knowing the positive pole to ground short circuit fault interval of the special subway rail reflux power supply system, acquiring data of adjacent power substations through a GOOSE network;
and processing and analyzing the ground voltage data of adjacent power substations, respectively processing different faults in the line, and comparing the voltage data of two sides to obtain the specific position of the fault point.
The further technical scheme is that for faults in the line, three cases are treated:
first case: 3 or more neighbors exist on the left side and the right side of the fault section;
the direct current grounding protection device at any side of the fault interval reads the grounding voltage of the left and right 3 neighbors and the distance between the left and right 3 neighbors through a GOOSE network;
the left side and the right side of the short-circuit section can be used as an origin, the left side of the short-circuit section (hereinafter referred to as the book) is taken as an example, the distance between the adjacent positions is taken as an x axis, and the right side of the adjacent positions is considered as the x positive direction; taking the voltage to ground as the y axis, the quadratic interpolation can be used for expressing the voltage change relation at two sides of the short circuit interval.
The specific principle is as follows: taking the right side as an example, the protection device reads three ground voltages U on the right side of the short-circuit section through a GOOSE network er1 、U er2 、U er3 Reading the distances L between the three right sides r1 、L r2 、L r3 Then the right Lagrangian-based quadratic interpolation polynomial can be described as
Similarly, the Lagrangian-based quadratic interpolation polynomial to the left of the short-circuited section can be written as
In U el1 、U el2 、U el3 To the ground voltage of the left three places of the book, L l1 、L l2 、L l3 Three distances from the book to the left of the book.
Let f l (x)＝f r (x) The fitting fault point x value can be solved. If the left side of the point is a fault interval, the value x is inverted and is the distance between the fault point and the point; if the right side of the point is the fault interval, the x value is the distance of the fault point. The right side of the upper example is the right side of the fault sectionAnd the x value is the distance from the fault point to the base.
Second case: only 2 neighbors exist on the left side and the right side of the fault interval;
there are only 2 neighbors to the left of the failure interval: the protection device at any side of the fault interval reads the earth voltage of the left 2 neighbors and the distance between the protection device and the left 2 neighbors through a GOOSE network; simultaneously reading the ground voltage of the right 3 neighbors and the distance between the ground voltage and the right 3 neighbors through a GOOSE network;
there are only 2 neighbors to the right of the failure interval: the protection device at any side of the fault interval reads the ground voltage of the right 2 neighbors and the distance between the ground voltage and the right 2 neighbors through a GOOSE network; simultaneously, the ground voltage of the left 3 neighbors and the distance between the ground voltage and the right 3 neighbors are read through a GOOSE network;
taking the example that only 2 neighbors exist on the left side of the fault interval: taking the left side and the right side of the short-circuit section as the origin, taking the left side of the short-circuit section (hereinafter referred to as the book) as the origin of coordinates, taking the origin of coordinates as the origin of coordinates, taking the distance between adjacent books as the x axis, and taking the right side of the book as the positive x direction; and taking the ground voltage as the y axis, the voltage change relation at the left side of the short circuit section can be expressed by using primary interpolation, and the voltage change relation at the right side of the short circuit section can be expressed by using secondary interpolation.
The specific principle is as follows: the protection device uses GOOSE to read the right 3 ground voltages U er1 、U er2 、U er3 Reading the distance L between the right 3 distances r1 、L r2 、L r3 Then the right side is based on the Lagrangian quadratic interpolation polynomial f r (x) Can be described as
Similarly, the protection device reads the left 2 ground voltages U through the GOOSE network el1 、U el2 Reading the distance L between the right 2 distances l1 、L l2 Then the Lagrangian-based one-time interpolation polynomial f l (x) The method can be written as follows:
let fl (x) =fr (x), the fitting fault point x value can be solved. If the left side of the point is a fault interval, the value x is inverted and is the distance between the fault point and the point; if the right side of the point is the fault interval, the x value is the distance of the fault point. The right side of the above example is the right side of the fault interval, and the x value is the distance of the fault point.
Third case: only 1 neighbor exists on the left side and the right side of the fault interval;
there are only 1 neighbor to the left of the failure interval: the protection device at any side of the fault interval reads the earth voltage of the left 1 adjacent place and the distance between the earth voltage and the left 1 adjacent place through a GOOSE network; reading the ground voltage of the right 3 neighbors and the distance between the ground voltage and the right 3 neighbors through a GOOSE network;
there are only 1 neighbor to the right of the failure interval: the protection device at any side of the fault interval reads the ground voltage of the 1 adjacent place at the right side and the distance of the 1 adjacent place at the left side from the ground voltage through a GOOSE network; and reading the ground voltage of the left 3 neighbors and the distance between the ground voltage and the right 3 neighbors through a GOOSE network.
Taking the example that only 1 neighbor exists on the left side of the fault interval: taking the coordinate origin point at the left side of the short-circuit section as an example (hereinafter referred to as the book) and taking the coordinate origin point at the book and the distance between adjacent books as x-axis, the right side of the book is x-positive; taking the voltage to ground as the y axis, the quadratic interpolation can be used for expressing the voltage change relation at the right side of the short circuit interval.
The specific principle is as follows: the protection device uses GOOSE to read the right 3 ground voltages U er1 、U er2 、U er3 Reading the distance L between the right 3 distances r1 、L r2 、L r3 Then the right side is based on the Lagrangian quadratic interpolation polynomial f r (x) Can be described as
Let U el1 =fr (x), the fitting fault point x value can be solved. If the left side of the point is a fault interval, the value x is inverted and is the distance between the fault point and the point; if the right side of the point is the fault interval, the x value is the distance of the fault point. The right side of the above example is the right side of the fault interval, and the x value is the distance of the fault point.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: after the earth leakage relay protection device in the intelligent substation adopts the processing method, the distance measurement of the positive pole earth short circuit fault under the special rail backflow power supply mode can be realized, the fault point can be accurately positioned, the fault removal time is reduced, and the running stability of the power grid is improved.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic diagram of the ground resistance of a 64D device in a method according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a transformer substation circuit in a method according to an embodiment of the invention;
FIG. 3 is a process flow diagram of a method according to an embodiment of the invention;
fig. 4 is a flowchart of a method according to an embodiment of the present invention.
FIG. 5 is a schematic diagram of the value of case 1 in the method according to the embodiment of the present invention;
FIG. 6 is a schematic diagram of the value of case 2 in the method according to the embodiment of the present invention;
FIG. 7 is a schematic representation of the value of case 3 in the method according to the embodiment of the present invention;
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
The 64D grounding protection device mainly comprises a grounding resistor and a diode, the schematic diagram of which is shown in fig. 1, and the 64D grounding protection device judges whether faults occur by detecting the voltage to ground. The 64D grounding protection device of each traction substation is required to support a GOOSE communication protocol and access the GOOSE switch of the traction substation, the GOOSE switches of adjacent stations are cascaded together, and the line length between the left and right adjacent stations of the traction substation is input in the fixed value of each substation protection device. The circuit schematic diagram of the substation is shown in fig. 2.
Based on GOOSE communication, as shown in fig. 3, the invention discloses a method for judging the position of a positive pole to ground short circuit fault of a special rail reflux power supply system for subways, which comprises the following steps:
on the premise of knowing the positive pole to ground short circuit fault interval of the special subway rail reflux power supply system, acquiring data of adjacent power substations through a GOOSE network;
and processing and analyzing the ground voltage data of adjacent power substations, respectively processing different faults in the line, and comparing the voltage data of two sides to obtain the specific position of the fault point.
The judging flow of the method is shown in fig. 4, and the following details are described in the following with reference to the details:
when the positive electrode is short-circuited to the ground, on the premise of known fault intervals, according to the difference of the positions of the short-circuited intervals in the whole line, the following three conditions are discussed:
case 1: 3 or more neighbors are arranged on the left side and the right side of the short circuit section
As shown in fig. 5, a short-circuit fault to ground is detected between the traction stations 3 and 4, and 3 or more traction stations are arranged on the left and right sides of the fault zone, taking distance measurement of the left side of the fault zone (hereinafter referred to as the post) as an example, the protection device reads through a GOOSE networkTaking the ground voltage of the right 3 neighbors and the distance between the right two neighbors, and the ground voltage of the left 2 neighbors and the distance between the right two neighbors. Taking the coordinate origin as the coordinate origin, taking the distance between adjacent points as the x axis, and considering the right side of the point as the x positive direction; taking the ground voltage as the y axis, the ground voltage data on the left side and the right side can be processed by using secondary interpolation. Taking the right side of the fault interval as an example, the protection device reads three ground voltages U on the right side through a GOOSE network er1 、U er2 、U er3 Reading the distances L between the three right sides r1 、L r2 、L r3 Then the right Lagrangian-based quadratic interpolation polynomial can be described as
Similarly, the Lagrangian-based quadratic interpolation polynomial on the left side can be written as
U el1 、U el2 、U el3 Ground voltages of three places at the left side of the fault interval, L l1 、L l2 、L l3 Three distances from the left side of the fault interval. Note U el1 Namely the ground voltage, L l1 Is 0.
Let f l (x)＝f r (x) The fitting fault point x value can be solved. If the left side of the point is a fault interval, the value x is inverted and is the distance between the fault point and the point; if the right side of the point is the fault interval, the x value is the distance of the fault point. The right side of the above example is the right side of the fault interval, and the x value is the distance of the fault point.
Case 2: only 2 neighbors exist on the left side and the right side of the fault section
As shown in fig. 6, the traction stations 2 and 3 detect a short circuit to ground fault, but there are only 2 adjacent stations at the left side of the fault section, and the distance measurement of the station at the left side of the fault section (hereinafter referred to as the station) is taken as an example, that is, the present protection device uses GOOSE to read the ground voltage U of 1 station at the left side el2 Reading 1 distance L from the left side l2 The left side is based on the written as the Lagrangian one-time interpolation polynomial
U el1 、U el2 To the ground voltage of two places at the left side of the fault zone, L l1 、L l2 The distance between the two points on the left side of the fault interval. Note U el1 Namely the ground voltage, L l1 Is 0.
As shown in FIG. 6, there are more than 3 traction stations on the right side of the fault section, and data is processed by secondary interpolation, i.e. the protection device uses GOOSE to read the ground voltage U of the 3 stations on the right side er1 、U er2 、U er3 Reading the distance L between the right 3 distances r1 、L r2 、L r3 Then the right Lagrangian-based quadratic interpolation polynomial can be described as
Let f l (x)＝f r (x) The fitting fault point x value can be solved. If the left side of the point is a fault interval, the value x is inverted and is the distance between the fault point and the point; if the right side of the point is the fault interval, the x value is the distance of the fault point. The right side of the above example is the right side of the fault interval, and the x value is the distance of the fault point.
Case 3: only 1 adjacent place exists on one side of the fault section
As shown in fig. 7, the traction stations 1 and 2 detect a positive short circuit to ground fault, and take distance measurement of the left side of the fault section (hereinafter referred to as the present station) as an example, the present station does not have an adjacent station on the left side, in which case, data processing is not needed, and only the present voltage to ground U is recorded el1 。
More than 3 traction stations exist on the right side of the fault interval, data are processed by adopting secondary interpolation, namely the protection device reads the ground voltage U of the 3 stations on the right side by using GOOSE er1 、U er2 、U er3 Reading the distance L between the right 3 distances r1 、L r2 、L r3 Then the right Lagrangian-based quadratic interpolation polynomial can be described as
Let U el1 ＝f r (x) The fitting fault point x value can be solved. If the left side of the point is a fault interval, the value x is inverted and is the distance between the fault point and the point; if the right side of the point is the fault interval, the x value is the distance of the fault point. The right side of the above example is the right side of the fault interval, and the x value is the distance of the fault point.
After the earth leakage relay protection device in the intelligent substation adopts the processing method, the distance measurement of the positive pole earth short circuit fault under the special rail backflow power supply mode can be realized, the fault point can be accurately positioned, the fault removal time is reduced, and the running stability of the power grid is improved.
Claims (3)
1. A method for judging the position of a positive pole to ground short circuit fault of a special rail reflux power supply system for subways is characterized by comprising the following steps:
on the premise of knowing the positive pole to ground short circuit fault interval of the special subway rail reflux power supply system, acquiring data of adjacent power substations through a GOOSE network;
processing and analyzing the ground voltage data of adjacent power substations, respectively processing different faults in the line, and comparing the voltage data of two sides to obtain the specific position of the fault point;
for faults in the line, three cases are handled:
first case: 3 or more neighbors exist on the left side and the right side of the fault section;
the direct current grounding protection device at any side of the fault interval reads the grounding voltage of the left and right 3 neighbors and the distance between the left and right 3 neighbors through a GOOSE network;
second case: only 2 neighbors exist on the left side and the right side of the fault interval;
there are only 2 neighbors to the left of the failure interval: the protection device at any side of the fault interval reads the earth voltage of the left 2 neighbors and the distance between the protection device and the left 2 neighbors through a GOOSE network; simultaneously reading the ground voltage of the right 3 neighbors and the distance between the ground voltage and the right 3 neighbors through a GOOSE network;
there are only 2 neighbors to the right of the failure interval: the protection device at any side of the fault interval reads the ground voltage of the right 2 neighbors and the distance between the ground voltage and the right 2 neighbors through a GOOSE network; simultaneously, the ground voltage of the left 3 neighbors and the distance between the ground voltage and the right 3 neighbors are read through a GOOSE network;
third case: only 1 neighbor exists on the left side and the right side of the fault interval;
there are only 1 neighbor to the left of the failure interval: the protection device at any side of the fault interval reads the earth voltage of the left 1 adjacent place and the distance between the earth voltage and the left 1 adjacent place through a GOOSE network; reading the ground voltage of the right 3 neighbors and the distance between the ground voltage and the right 3 neighbors through a GOOSE network;
there are only 1 neighbor to the right of the failure interval: the protection device at any side of the fault interval reads the ground voltage of the 1 adjacent place at the right side and the distance of the 1 adjacent place at the left side from the ground voltage through a GOOSE network; reading the ground voltage of the left 3 neighbors and the distance between the ground voltage and the right 3 neighbors through a GOOSE network;
when 3 or more neighbors exist on the left and right sides of the fault section:
taking the coordinate origin point at the left side of the short-circuit interval as an example, taking the coordinate origin point at the left side of the short-circuit interval as the reference point, and taking the distance between the adjacent points as the x axis, and considering the right side of the reference point as the x positive direction; taking the voltage to ground as a y axis, and processing voltage data by using secondary interpolation; on the right side of the fault section, the protection device reads three ground voltages U on the right side of the fault section through a GOOSE network er1 、U er2 、U er3 Reading the distances L between the three right sides r1 、L r2 、L r3 Then the right side is based on the Lagrangian quadratic interpolation polynomial f r (x) Can be described as:
similarly, the Lagrange-based quadratic interpolation polynomial f on the left l (x) The method can be written as follows:
in U el1 、U el2 、U el3 To the ground voltage of the left three places of the book, L l1 、L l2 、L l3 Three distances from the left side of the book;
let f l (x)＝f r (x) Solving a fitting fault point x value; if the left side of the point is a fault interval, the value x is inverted and is the distance between the fault point and the point; if the right side of the point is the fault interval, the x value is the distance of the fault point.
2. The method for judging the position of the positive pole-to-ground short circuit fault of the special rail reflux power supply system for the subway as claimed in claim 1, wherein when only 2 neighbors exist on the left side of the fault interval:
taking the coordinate origin point at the left side of the short-circuit interval as an example, taking the coordinate origin point at the left side of the short-circuit interval as a base, the protection device reads the ground voltage of the left 2 neighbors and the distance of the protection device from the left 2 neighbors through a GOOSE network; reading the ground voltage of 3 neighbors on the right side of the short-circuit section and the distances between the ground voltage and the 3 neighbors on the right side of the short-circuit section through a GOOSE network; taking the origin of coordinates as an x-axis, and taking the distance between adjacent points as an x-axis, wherein the right side of the point is x-positive; taking the voltage to ground as a y axis, expressing the voltage change relation at the left side of the short circuit interval by using primary interpolation and expressing the voltage change relation at the right side of the short circuit interval by using secondary interpolation;
the protection device uses GOOSE to read the right 3 ground voltages U er1 、U er2 、U er3 Reading the distance L between the right 3 distances r1 、L r2 、L r3 Then the right side is based on the Lagrangian quadratic interpolation polynomial f r (x) Can be described as:
similarly, the protection device reads the left 2 ground voltages U through the GOOSE network el1 、U el2 Reading the distance L between the right 2 distances l1 、L l2 Then the Lagrangian-based one-time interpolation polynomial f l (x) The method can be written as follows:
let fl (x) =fr (x), the fitting fault point x value can be solved; if the left side of the point is a fault interval, the value x is inverted and is the distance between the fault point and the point; if the right side of the point is the fault interval, the x value is the distance of the fault point.
3. The method for judging the position of the positive pole-to-ground short circuit fault of the special rail reflux power supply system for the subway as claimed in claim 1, wherein when only 1 neighbor exists on the left side of the fault interval:
taking the coordinate origin point at the left side of the short-circuit section as an example, taking the origin point as the coordinate origin point at the left side of the short-circuit section, hereinafter referred to as the book, reading the ground voltage of 3 neighbors at the right side of the short-circuit section and the distances between the ground voltage and the 3 neighbors at the right side of the short-circuit section through a GOOSE network; taking the origin of coordinates as an x-axis, and taking the distance between adjacent points as an x-axis, wherein the right side of the point is x-positive; taking the voltage to ground as a y axis, and expressing the voltage change relation on the right side of the short circuit interval by using secondary interpolation;
the protection device uses GOOSE to read the right 3 ground voltages U er1 、U er2 、U er3 Reading the distance L between the right 3 distances r1 、L r2 、L r3 Then the right side is based on Lagrange's quadratic interpolation polynomialF, f r (x) Can be described as:
let U el1 =fr (x), the fitting fault point x value can be solved; if the left side of the point is a fault interval, the value x is inverted and is the distance between the fault point and the point; if the right side of the point is the fault interval, the x value is the distance of the fault point.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040044838A (en) * | 2002-11-22 | 2004-05-31 | 주식회사 젤파워 | Method for locating fault distance in a DC power supply system using an electric railroad |
| CN103412239A (en) * | 2013-07-03 | 2013-11-27 | 南京南瑞继保电气有限公司 | Detecting and positioning method of bus coupler flashover fault in subway alternating current power system |
| CN111579925A (en) * | 2020-05-21 | 2020-08-25 | 西南交通大学 | Positive rail ground fault positioning method of fourth rail backflow traction power supply system |
| KR20210130437A (en) * | 2020-04-22 | 2021-11-01 | 피앤씨테크 주식회사 | System and Method for combined fault locating in electric railway |
| CN113873471A (en) * | 2021-09-09 | 2021-12-31 | 上海伽易信息技术有限公司 | Construction method of subway track line wireless environment fingerprint database based on SVM |
| KR102400156B1 (en) * | 2021-02-04 | 2022-05-20 | 인텍전기전자(주) | Correction system of fault location ac railway using multi-point setup and linear interpolation and method thereof |
-
2023
- 2023-04-25 CN CN202310455251.8A patent/CN116500378B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040044838A (en) * | 2002-11-22 | 2004-05-31 | 주식회사 젤파워 | Method for locating fault distance in a DC power supply system using an electric railroad |
| CN103412239A (en) * | 2013-07-03 | 2013-11-27 | 南京南瑞继保电气有限公司 | Detecting and positioning method of bus coupler flashover fault in subway alternating current power system |
| KR20210130437A (en) * | 2020-04-22 | 2021-11-01 | 피앤씨테크 주식회사 | System and Method for combined fault locating in electric railway |
| CN111579925A (en) * | 2020-05-21 | 2020-08-25 | 西南交通大学 | Positive rail ground fault positioning method of fourth rail backflow traction power supply system |
| KR102400156B1 (en) * | 2021-02-04 | 2022-05-20 | 인텍전기전자(주) | Correction system of fault location ac railway using multi-point setup and linear interpolation and method thereof |
| CN113873471A (en) * | 2021-09-09 | 2021-12-31 | 上海伽易信息技术有限公司 | Construction method of subway track line wireless environment fingerprint database based on SVM |
Non-Patent Citations (1)
| Title |
|---|
| 基于时域微分的地铁直流供电系统故障定位仿真;金雪丰;李正茂;胡振;;船电技术(第04期);67-70 * |
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