Railway at power supply f-r and t-f fault ranging precision improvement method

Abstract

The application discloses a railway AT power supply F-R and T-F fault distance measurement precision improving method, which comprises the following steps: acquiring distance measurement error information of the first type of fault; acquiring distance measurement errors of the up-down current ratio method and the transverse connection line current ratio method when a contact line-steel rail T-R fault occurs under the AT power supply mode; acquiring line parameters and unit impedances of line contact lines and return lines; calculating distance measurement error theoretical values of the second type of fault; calculating F-R and T-F fault distance measurement error theoretical values corresponding to the up-down current ratio method; calculating F-R and T-F fault distance measurement error theoretical values corresponding to the transverse connection line current ratio method; correcting fault distance measurement structures, generating an error table or an error curve by using the third data group to the sixth data group, and correcting actual F-R and T-F fault distance measurement results based on the error table or the error curve, and outputting the corrected fault distance. The method has the advantages that the F-R and T-F fault distance measurement precision under the railway AT power supply mode is further improved.

Description

Technical Field

[0001] This invention relates to the field of railway traction power supply technology, and more specifically, to a method for improving the accuracy of fault location for FR and TF in railway AT power supply. Background Technology

[0002] Currently, when the railway traction power supply system adopts the AT power supply method, if the line experiences FR or TF faults, the up-down current ratio method and the cross-connection current ratio method are the two main methods used by the ranging device.

[0003] The short-circuit test method can be used to adjust the ranging results of the up-and-down current ratio method and the cross-connection current ratio method. However, this method generally only uses a few tests to estimate the setting value for the entire line section, and the limited test data may result in poor improvement in ranging accuracy. Compared with FR and TF faults, the ranging error when TR faults occur on the line can be obtained by analyzing the spatiotemporal current information of the train and the ranging device. The difficulty in obtaining a large amount of data is relatively low. By calculating the theoretical value of the ranging error when FR and TF faults are caused by TR faults, the ranging accuracy of FR and TF faults can be further improved.

[0004] In summary, at least one of the following technical problems exists:

[0005] The ranging device is not accurate enough when using the up-down current ratio method and the cross-connection current ratio method for FR and TF fault ranging.

[0006] Compared to TR faults in railway lines, the fault location error for FR and TF faults is difficult to obtain directly using simple methods.

[0007] How can we obtain sufficient data to correct the ranging accuracy problem of FR and TF faults without relying on costly short-circuit tests? Summary of the Invention

[0008] The main objective of this invention is to provide a method for improving the accuracy of fault location for FR and TF faults in railway AT power supply, in order to solve the problem of insufficient accuracy of existing fault location devices when using the up-down current ratio method and the cross-connection current ratio method for FR and TF fault location; and how to obtain sufficient data to correct the location accuracy of FR and TF faults without relying on costly short-circuit tests.

[0009] To achieve the above objectives, according to one aspect of the present invention, a method for improving the accuracy of fault location for railway AT power supply FR and TF is provided, comprising:

[0010] Obtain the ranging error information of the first type of fault, and obtain the ranging error of the up and down current ratio method and the cross-connecting current ratio method when a contact wire-rail TR fault occurs under AT power supply mode, which are respectively recorded as the first data group and the second data group.

[0011] Obtain the line parameters, and obtain the unit impedance of the line contact wire and return wire, which are denoted as the first impedance and the second impedance, respectively.

[0012] The theoretical values ​​of the ranging error for the second type of fault are calculated. Based on the first data group, the second data group, the first impedance, and the second impedance, the theoretical values ​​of the FR and TF fault ranging errors corresponding to the uplink and downlink current ratio method are calculated and denoted as the third data group and the fourth data group, respectively. The theoretical values ​​of the FR and TF fault ranging errors corresponding to the cross-connection current ratio method are calculated and denoted as the fifth data group and the sixth data group, respectively.

[0013] The fault location structure is modified by using the third to sixth data groups to generate an error table or error curve. Based on the error table or error curve, the actual FR and TF fault location results are corrected, and the corrected fault distance is output.

[0014] Preferably, the uplink / downlink current ratio method and the cross-connection current ratio method TR fault location error information are respectively recorded as the first data group and the second data group:

[0015] First data set:

[0016] Second data set:

[0017] In the formula, Δx 1,1 Δx 1,2 Δx 1,3 … Δx 1,n For the first to nth fault location error data using the uplink-downlink current ratio method, Δx 2,1 Δx 2,2 Δx 2,3 … Δx 2,k The data represents the fault location error data from the 1st to the kth faults in the cross-connection current ratio method, where n and k are the number of data points in the data set.

[0018] Preferably, the theoretical values ​​of FR and TF fault location errors corresponding to the uplink / downlink current ratio method are obtained by calculation using the relational formula, and are denoted as the third data group and the fourth data group, respectively:

[0019] Third data set:

[0020] Fourth data group:

[0021] In the formula, Δx3,1 Δx 3,2 Δx 3,3 … Δx 3,n Δx is the theoretical value of the fault location error using the uplink / downlink current ratio method (FR). 4,1 Δx 4,2 Δx 4,3 … Δx 4,n This represents the theoretical value of the fault location error using the uplink / downlink current ratio method (TF).

[0022] Preferably, the third data group consists of The fourth data set was obtained; We obtain the formula, where Δx 1,i For the i-th data in the first data set, Δx 3,i For the i-th data in the third data set, Δx 4,i Z represents the i-th data point in the fourth data set, where i = 1, 2, 3…n. T Z represents the unit impedance of the line contact wire. F This is the unit impedance of the return line.

[0023] Preferably, the theoretical values ​​of FR and TF fault location errors corresponding to the uplink / downlink current ratio method are obtained by calculation using the relational formula, and are denoted as the fifth data group and the sixth data group, respectively:

[0024] Fifth data group:

[0025] Sixth data group:

[0026] In the formula, Δx 5,1 Δx 5,2 Δx 5,3 … Δx 5,k Δx is the theoretical value of the fault location error in the cross-line current ratio method (FR). 6,1 Δx 6,2 Δx 6,3 … Δx 6,k This represents the theoretical value of the fault location error in the cross-connection current ratio method (TF).

[0027] Preferably, the fifth data group consists of The sixth data set was obtained from... We obtain the formula, where Δx 2,j For the j-th data in the second data set, Δx 5,j For the j-th data in the fifth data set, Δx 6,j Let Z be the j-th data point in the sixth data set, where j = 1, 2, 3…k. T Z represents the unit impedance of the line contact wire. F This is the unit impedance of the return line.

[0028] Preferably, the corrected fault location value is obtained and used as the output of the ranging device:

[0029]

[0030]

[0031]

[0032]

[0033] In the formula, x 1,0 x 2,0 x 3,0 x 4,0 The output results of the distance measuring device before correction are FR (upstream / downstream current ratio method), TF (fault ranging), FR (cross-line current ratio method), and TF (fault ranging), Δx. 3,i Δx 4,i For the i-th data in the third and fourth data sets, Δx 5,j Δx 6,j For the j-th data in the fifth and sixth data groups, x1, x2, x3, and x4 are the output results of the corrected ranging device using the uplink-downlink current ratio method (FR), TF fault ranging method (FR), and cross-line current ratio method (FR), TF fault ranging method (FR), respectively.

[0034] Preferably, the error of FR / TF is indirectly obtained by using the ranging error of TR fault and line impedance through relational calculation.

[0035] The technical solution of this invention has the following technical effects:

[0036] A method for calculating the fault ranging error of FR and TF based on the spatiotemporal current information of trains and ranging devices is proposed. This method solves the problem of poor correction effect caused by insufficient data in the traditional FR and TF fault ranging result setting and correction process, and further improves the accuracy of FR and TF fault ranging under the railway AT power supply mode. Attached Figure Description

[0037] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0038] Figure 1 A flowchart of the fault location accuracy improvement method according to the present invention is shown.

[0039] Figure 2 It shows Figure 1A schematic diagram of fault types under AT power supply mode in the method of improving the fault location accuracy of FR and TF faults in railway AT power supply;

[0040] Figure 3 It shows Figure 1 A view of TR fault location error data obtained from the method for improving the accuracy of FR and TF fault location in railway AT power supply;

[0041] Figure 4 It shows Figure 1 The error calculation curve view used when correcting the fault location results in the railway AT power supply FR and TF fault location accuracy improvement method. Detailed Implementation

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] like Figures 1 to 4 As shown, this embodiment of the invention provides a method for improving the accuracy of fault location for FR and TF faults in railway AT power supply, including: acquiring location error information for a first type of fault; acquiring location errors for the up-down current ratio method and the cross-connecting current ratio method when a contact wire-rail TR fault occurs under AT power supply mode, denoted as the first data group and the second data group, respectively; acquiring line parameters; acquiring the unit impedance of the line contact wire and return wire, denoted as the first impedance and the second impedance, respectively; calculating the theoretical value of location error for a second type of fault; calculating the theoretical values ​​of FR and TF fault location errors corresponding to the up-down current ratio method based on the first data group, the second data group, the first impedance, and the second impedance, denoted as the third data group and the fourth data group, respectively; calculating the theoretical values ​​of FR and TF fault location errors corresponding to the cross-connecting current ratio method, denoted as the fifth data group and the sixth data group, respectively; correcting the fault location structure; generating an error table or error curve using the third to sixth data groups; and correcting the actual FR and TF fault location results based on the error table or error curve, outputting the corrected fault distance.

[0044] First, the distance measurement errors of the up-and-down current ratio method and the cross-connecting current ratio method under AT power supply mode can be obtained from the train's spatiotemporal current information. Additionally, the unit impedance of the T-line (contact wire) and F-line (return wire) is obtained. Second, the theoretical values ​​of the distance measurement errors for FR and TF faults are calculated using formulas. Finally, the obtained theoretical values ​​of the distance measurement errors are used to correct the fault distance measurement results of the up-and-down current ratio method and the cross-connecting current ratio method. Traditional FR and TF fault distance measurement correction methods mostly rely on short-circuit tests. This method uses the TR fault distance measurement error and the unit impedance of the T-line and F-line for calculation, solving the problem of insufficient data leading to poor correction effects in the traditional FR and TF fault distance measurement result correction process, and further improving the accuracy of FR and TF fault distance measurement under railway AT power supply mode.

[0045] In this embodiment, after starting error calculation and fault location correction, the uplink / downlink current ratio method and the cross-connection line current ratio method TR fault location error information are obtained and recorded as the first data group and the second data group, respectively.

[0046] Obtain the unit impedance of the contact wire and return wire, denoted as Z. T Z F ;

[0047] The theoretical values ​​of FR and TF fault location errors corresponding to the uplink and downlink current ratio method are obtained by calculation using the relational formula, and are denoted as the third data group and the fourth data group, respectively.

[0048] The theoretical values ​​of FR and TF fault location errors corresponding to the cross-connection current ratio method are obtained by calculation using the relational formula, and are denoted as the fifth data group and the sixth data group, respectively.

[0049] Error tables or error curves are generated from the third, fourth, fifth, and sixth data groups. These tables or curves are then used to correct the FR and TF fault location errors under AT power supply mode using the uplink / downlink current ratio method and the cross-connection current ratio method.

[0050] In this embodiment, the TR fault location error information of the uplink / downlink current ratio method and the cross-connection current ratio method is recorded as the first data group and the second data group, respectively:

[0051] First data set:

[0052] Second data set: (1)

[0053] In the formula, Δx 1,1 Δx 1,2 Δx 1,3 … Δx 1,n The fault location error data for the uplink / downlink current ratio method is Δx.2,1 Δx 2,2 Δx 2,3 … Δx 2,k The data represents the fault location error data using the cross-connection current ratio method, where n and k represent the number of data points in the data set.

[0054] In this embodiment, the unit impedance of the line contact wire and the return wire is denoted as Z. T Z F :

[0055] In this embodiment, the theoretical values ​​of FR and TF fault location errors corresponding to the uplink / downlink current ratio method are obtained by calculation using relational formulas, and are denoted as the third data group and the fourth data group, respectively:

[0056] Third data set:

[0057] Fourth data group: (2)

[0058] In the formula, Δx 3,1 Δx 3,2 Δx 3,3 … Δx 3,n Δx is the theoretical value of the fault location error using the uplink / downlink current ratio method (FR). 4,1 Δx 4,2 Δx 4,3 … Δx 4,n This represents the theoretical value of the fault location error using the uplink / downlink current ratio method (TF).

[0059] In this embodiment, the third data group and the fourth data group are calculated by equation (3) and equation (4), respectively:

[0060] (3)

[0061] (4)

[0062] In the formula, Δx 1,i For the i-th data in the first data set, Δx 3,i For the i-th data in the third data set, Δx 4,i Z represents the i-th data point in the fourth data set, where i = 1, 2, 3…n. T Z represents the unit impedance of the line contact wire. F This is the unit impedance of the return line.

[0063] In this embodiment, the theoretical values ​​of FR and TF fault location errors corresponding to the uplink / downlink current ratio method are obtained by calculation using relational formulas, and are denoted as the fifth data group and the sixth data group, respectively:

[0064] Fifth data group:

[0065] Sixth data group: (5)

[0066] In the formula, Δx 5,1 Δx 5,2 Δx 5,3 … Δx 5,k Δx is the theoretical value of the fault location error in the cross-line current ratio method (FR). 6,1 Δx 6,2 Δx 6,3 … Δx 6,k This represents the theoretical value of the fault location error in the cross-connection current ratio method (TF).

[0067] In this embodiment, the fifth data group and the sixth data group are calculated by equations (6) and (7), respectively:

[0068] (6)

[0069] (7)

[0070] In the formula, Δx 2,j For the j-th data in the second data set, Δx 5,j For the j-th data in the fifth data set, Δx 6,j Let Z be the j-th data point in the sixth data set, where j = 1, 2, 3…k. T Z represents the unit impedance of the line contact wire. F This is the unit impedance of the return line.

[0071] In this embodiment, the corrected fault ranging value is obtained and used as the output of the ranging device:

[0072]

[0073]

[0074]

[0075] (8)

[0076] In the formula, x 1,0 x 2,0 x 3,0 x 4,0 The output results of the distance measuring device before correction are FR (upstream / downstream current ratio method), TF (fault ranging), FR (cross-line current ratio method), and TF (fault ranging), Δx. 3,i Δx 4,i For the i-th data in the third and fourth data sets, Δx 5,j Δx 6,jFor the j-th data in the fifth and sixth data groups, x1, x2, x3, and x4 are the output results of the corrected ranging device using the uplink-downlink current ratio method (FR), TF fault ranging method (FR), and cross-line current ratio method (FR), TF fault ranging method (FR), respectively.

[0077] The specific process is as follows: Figure 1 As shown:

[0078] After starting error calculation and fault location correction, obtain the fault location error information of the uplink / downlink current ratio method and the cross-connection current ratio method TR, and record them as the first data group and the second data group, respectively.

[0079] First data set:

[0080] Second data set:

[0081] In the formula, Δx 1,1 Δx 1,2 Δx 1,3 … Δx 1,n The fault location error data for the uplink / downlink current ratio method is Δx. 2,1 Δx 2,2 Δx 2,3 … Δx 2,k The data represents the fault location error data using the cross-connection current ratio method, where n and k represent the number of data points in the data set.

[0082] Obtain the unit impedance of the contact wire and return wire, denoted as Z. T Z F ;

[0083] The theoretical values ​​of FR and TF fault location errors corresponding to the uplink and downlink current ratio method are obtained by calculation using the relational formula, and are denoted as the third data group and the fourth data group, respectively.

[0084] Third data set:

[0085] Fourth data group:

[0086]

[0087]

[0088] In the formula, Δx 3,1 Δx 3,2 Δx 3,3 … Δx 3,n Δx is the theoretical value of the fault location error using the uplink / downlink current ratio method (FR). 4,1 Δx 4,2 Δx 4,3 … Δx4,n Δx represents the theoretical value of the fault location error using the uplink / downlink current ratio method for TF fault location. 1,i For the i-th data in the first data set, Δx 3,i For the i-th data in the third data set, Δx 4,i Z represents the i-th data point in the fourth data set, where i = 1, 2, 3…n. T Z represents the unit impedance of the line contact wire. F This is the unit impedance of the return line.

[0089] The theoretical values ​​of FR and TF fault location errors corresponding to the cross-connection current ratio method are obtained by calculation using the relational formula, and are denoted as the fifth data group and the sixth data group, respectively.

[0090] Fifth data group:

[0091] Sixth data group:

[0092]

[0093]

[0094] In the formula, Δx 5,1 Δx 5,2 Δx 5,3 … Δx 5,k Δx is the theoretical value of the fault location error in the cross-line current ratio method (FR). 6,1 Δx 6,2 Δx 6,3 … Δx 6,k Δx represents the theoretical error of the TF fault location method using the cross-line current ratio method. 2,j For the j-th data in the second data set, Δx 5,j For the j-th data in the fifth data set, Δx 6,j Let Z be the j-th data point in the sixth data set, where j = 1, 2, 3…k. T Z represents the unit impedance of the line contact wire. F This is the unit impedance of the return line.

[0095] An error table or error curve is generated from the third, fourth, fifth, and sixth data sets. The error table or error curve is then used to correct the FR and TF fault location errors under the AT power supply mode using the uplink / downlink current ratio method and the cross-connection current ratio method.

[0096]

[0097]

[0098]

[0099]

[0100] In the formula, x 1,0 x 2,0 x 3,0 x 4,0 The output results of the distance measuring device before correction are FR (upstream / downstream current ratio method), TF (fault ranging), FR (cross-line current ratio method), and TF (fault ranging), Δx. 3,i Δx 4,i For the i-th data in the third and fourth data sets, Δx 5,j Δx 6,j For the j-th data in the fifth and sixth data groups, x1, x2, x3, and x4 are the output results of the corrected ranging device using the uplink-downlink current ratio method (FR), TF fault ranging method (FR), and cross-line current ratio method (FR), TF fault ranging method (FR), respectively.

[0101] Example

[0102] A simulation calculation example in PSCAD / EMTDC demonstrates the calculation of fault location errors in railway AT power supply FR and TF systems, and the method for improving location accuracy. Figure 1 As shown;

[0103] Set the number of data points in the data group to 14, that is, n = k = 1, 2, 3 … 14;

[0104] A set of error information for TR fault location using the uplink / downlink current ratio method and the cross-connection current ratio method, namely Δx 1,n Δx 2,k As shown in Table 1;

[0105] The unit impedance of a set of contact wires and return wires is Z. T =0.10+j0.51Ω、Z F =0.16+j0.71Ω;

[0106] The theoretical values ​​of the fault location errors FR and TF corresponding to the uplink / downlink current ratio method, i.e., Δx, are obtained by calculating the relational formula. 3,i Δx 4,i As shown in Table 1;

[0107] The theoretical values ​​of the fault location errors FR and TF corresponding to the cross-connection current ratio method, i.e., Δx, are obtained by calculating the relational formula. 5,j Δx 6,j As shown in Table 1;

[0108] Table 1. Ranging error values ​​and calculated theoretical error values

[0109] The actual ranging results were corrected using the theoretical values ​​of FR and TF fault ranging errors in Table 1. The results before and after correction are shown in Table 2.

[0110] Table 2 Output results of the fault location device before and after correction

[0111]

[0112] When the fault location is 5km away, after the FR and TF faults occur, the corrected distance measurement results output by the uplink and downlink current ratio method of the fault ranging device are 5006m and 5003m, respectively; the corrected distance measurement results output by the cross-connection current ratio method of the fault ranging device are 5005m and 5003m, respectively.

[0113] When the fault location is 10km away, after the FR and TF faults occur, the corrected distance measurement results output by the uplink and downlink current ratio method of the fault ranging device are 9999m and 9999m respectively; the corrected distance measurement results output by the cross-connection current ratio method of the fault ranging device are 10000m and 10000m respectively.

[0114] The steps provided by this invention can be implemented in the fault location analysis module of the railway power supply SCADA system, or integrated into the fault location device at the station end.

[0115] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0116] This invention solves the problem of insufficient data volume leading to poor correction effect during the traditional FR and TF fault ranging result setting and correction process, and further improves the accuracy of FR and TF fault ranging under railway AT power supply mode.

[0117] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for improving the accuracy of fault location for FR and TF power supply in railway AT systems, characterized in that, include: Obtain the ranging error information of the first type of fault, and obtain the ranging error of the up and down current ratio method and the cross-connecting current ratio method when a contact wire-rail TR fault occurs under AT power supply mode, which are respectively recorded as the first data group and the second data group. Obtain the line parameters, and obtain the unit impedance of the line contact wire and return wire, which are denoted as the first impedance and the second impedance, respectively. The theoretical values ​​of the ranging error for the second type of fault are calculated. Based on the first data group, the second data group, the first impedance, and the second impedance, the theoretical values ​​of the FR and TF fault ranging errors corresponding to the uplink and downlink current ratio method are calculated and denoted as the third data group and the fourth data group, respectively. The theoretical values ​​of FR and TF fault location errors corresponding to the cross-connection current ratio method were calculated and denoted as the fifth data group and the sixth data group, respectively. The fault location structure is modified by using the third to sixth data groups to generate an error table or error curve. Based on the error table or error curve, the actual FR and TF fault location results are corrected, and the corrected fault distance is output.

2. The method for improving the accuracy of fault location for railway AT power supply FR and TF as described in claim 1, characterized in that, The error information of the uplink / downlink current ratio method and the cross-connection current ratio method for TR fault location is recorded as the first data group and the second data group, respectively: First data set: ; Second data set: ; In the formula, Δx 1,1 Δx 1,2 Δx 1,3 … Δx 1,n For the first to nth fault location error data using the uplink-downlink current ratio method, Δx 2,1 Δx 2,2 Δx 2,3 … Δx 2,k The data represents the fault location error data from the 1st to the kth faults in the cross-connection current ratio method, where n and k are the number of data points in the data set.

3. The method for improving the accuracy of fault location for railway AT power supply FR and TF as described in claim 1, characterized in that, The theoretical values ​​of FR and TF fault location errors corresponding to the uplink / downlink current ratio method are obtained by calculation using the relational formula, and are denoted as the third and fourth data groups, respectively: Third data set: ; Fourth data group: ; In the formula, Δx 3,1 Δx 3,2 Δx 3,3 … Δx 3,n Δx is the theoretical value of the fault location error using the uplink / downlink current ratio method (FR). 4,1 Δx 4,2 Δx 4,3 … Δx 4,n This represents the theoretical value of the fault location error using the uplink / downlink current ratio method (TF).

4. The method for improving the accuracy of fault location for railway AT power supply FR and TF as described in claim 1, characterized in that, The third data group consists of The fourth data set was obtained; We obtain the formula, where Δx 1,i For the i-th data in the first data set, Δx 3,i For the i-th data in the third data set, Δx 4,i Z represents the i-th data point in the fourth data set, where i = 1, 2, 3…n. T Z represents the unit impedance of the line contact wire. F This is the unit impedance of the return line.

5. The method for improving the fault location accuracy of railway AT power supply FR and TF as described in claim 1, characterized in that, The theoretical values ​​of FR and TF fault location errors corresponding to the uplink / downlink current ratio method are obtained by calculation using the relational formula, and are denoted as the fifth and sixth data groups, respectively: Fifth data group: ; Sixth data group: ; In the formula, Δx 5,1 Δx 5,2 Δx 5,3 … Δx 5,k Δx is the theoretical value of the fault location error in the cross-line current ratio method (FR). 6,1 Δx 6,2 Δx 6,3 … Δx 6,k This represents the theoretical value of the fault location error in the cross-connection current ratio method (TF).

6. The method for improving the accuracy of fault location for railway AT power supply FR and TF as described in claim 1, characterized in that, The fifth data group consists of The sixth data set was obtained from... We obtain the formula, where Δx 2,j For the j-th data in the second data set, Δx 5,j For the j-th data in the fifth data set, Δx 6,j Let Z be the j-th data point in the sixth data set, where j = 1, 2, 3…k. T Z represents the unit impedance of the line contact wire. F This is the unit impedance of the return line.

7. The method for improving the accuracy of fault location for railway AT power supply FR and TF as described in claim 1, characterized in that, The corrected fault location value is obtained and used as the output of the ranging device: In the formula, x 1,0 x 2,0 x 3,0 x 4,0 The output results of the distance measuring device before correction are FR (upstream / downstream current ratio method), TF (fault ranging), FR (cross-line current ratio method), and TF (fault ranging), Δx. 3,i Δx 4,i For the i-th data in the third and fourth data sets, Δx 5,j Δx 6,j For the j-th data in the fifth and sixth data groups, x1, x2, x3, and x4 are the output results of the corrected ranging device using the uplink-downlink current ratio method (FR), TF fault ranging method (FR), and cross-line current ratio method (FR), TF fault ranging method (FR), respectively.

8. The method for improving the accuracy of fault location for railway AT power supply FR and TF as described in claim 1, characterized in that, By utilizing the ranging error of TR faults and line impedance, the error of FR / TF can be indirectly obtained through relational calculations.

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