A state assessment method for the stability of pantograph-catenary current collection quality under icing conditions

Abstract

This application presents a state assessment method for the stability of the bow-net current collection quality under icing conditions. First, a test platform for the stability of the bow-net current collection quality under icing conditions is built. Based on the built test platform, the parameters of the bow-net current collection quality stability under icing conditions are measured by various sensors. Based on the parameters measured by the sensors, the average bow-net offline rate ρ and the speed performance factor P are calculated. v , contact resistance stability factor H r , pantograph-catenary current stability factor G under icing conditions w Finally, the stability of the pantograph-catenary current collection quality under icing is assessed. The present invention can more accurately assess the stability of the pantograph-catenary current collection quality under icing, allowing timely measures to de-ice and melt the iced catenary, thus ensuring safe railway operation.

Description

Technical Field

[0001] The present invention relates to the field of evaluation of the stability of the current collecting quality of a pantograph and a catenary, and in particular to a state evaluation method for the stability of the current collecting quality of a pantograph and a catenary under icing conditions. Background Art

[0002] With economic and social development and the improvement of people's living standards, the demand for electrified railway transportation continues to grow. The quality of the catenary current collection system is one of the criteria for assessing the safety of high-speed railway operations. The catenary is exposed to the elements for long periods of time. In winter or at high altitudes, ice easily forms on the catenary, affecting the normal current collection of the catenary contact system. Catenary icing not only reduces the stability of the catenary current collection quality, but also triggers arcing in the catenary and exacerbates catenary dancing. In severe cases, it can also cause damage to the catenary equipment, such as serious accidents such as contact wire unbend and breakage. Icing is closely related to the quality of the catenary current collection system. Therefore, in the event of icing, the quality of the catenary current collection system can be used to determine whether immediate de-icing measures are necessary. Therefore, real-time monitoring of the stability of the catenary current collection system under icing is crucial.

[0003] At present, most of the research on the quality of the catenary current collection in China is based on simulation, which cannot fully reflect the actual situation on the ground. Although my country has conducted a lot of research on the quality of the catenary current collection, a complete evaluation standard system has not yet been formed. The existing evaluation standard system can only evaluate the quality of the catenary current collection and its stability based on single characterization factors such as contact pressure, arcing rate, vertical displacement of the contact point, and positioning point lift. In addition, some research results remain in the laboratory stage and have not been fully verified and applied in actual operation. Currently, there is a lack of a characterization factor that can be used in practice and better reflect the stability of the catenary current collection quality and a state assessment method to judge the stability of the catenary current collection quality. In order to better reflect the current collection quality stability of the catenary under ice conditions and determine whether to implement de-icing measures to ensure the normal operation of high-speed railways, it is urgently needed to establish a state assessment method for the stability of the catenary current collection quality under ice conditions to ensure the safe operation of electrified railways. Summary of the Invention

[0004] In order to more accurately evaluate the stability of the pantograph-catenary current collection quality under icing conditions, the present invention provides a state evaluation method for the stability of the pantograph-catenary current collection quality under icing conditions. The technical solution for achieving the purpose of the present invention is as follows:

[0005] Step 1: Build a test platform for the stability of the current collection quality of the pantograph and the grid under icing conditions. The platform includes: a Hall current sensor (1), a high-precision voltage sensor (2), a speed sensor (3), a photoelectric sensor (4), a filter (5), a host computer (6), a terminal (7), a pantograph (8), and a train (9);

[0006] The Hall current sensor (1) includes an upper Hall current sensor (10), a middle Hall current sensor (11), and a lower Hall current sensor (12); the high-precision voltage sensor (2) includes an upper high-precision voltage sensor (13), a middle high-precision voltage sensor (14), and a lower high-precision voltage sensor (15); the speed sensor (3) includes an upper speed sensor (16), a middle speed sensor (17), and a lower speed sensor (18); and the photoelectric sensor (4) includes an upper photoelectric sensor (19), a middle photoelectric sensor (20), and a lower photoelectric sensor (21);

[0007] The upper Hall current sensor (10), the middle Hall current sensor (11) and the lower Hall current sensor (12) are installed on the frame of the pantograph (8); the upper high-precision voltage sensor (13), the middle high-precision voltage sensor (14) and the lower high-precision voltage sensor (15) are installed in parallel on both sides of the contact point of the pantograph (8); the upper speed sensor (16), the middle speed sensor (17) and the lower speed sensor (18) are fixed on the body of the train (9); the upper photoelectric sensor (19), the middle photoelectric sensor (20) and the lower photoelectric sensor (21) are installed on the side of the upper part of the pantograph (8); the filter (5), the host computer (6) and the terminal (7) are placed inside the train (9) compartment;

[0008] The output ends of the upper Hall current sensor (10), the middle Hall current sensor (11), the lower Hall current sensor (12), the upper high-precision voltage sensor (13), the middle high-precision voltage sensor (14), the lower high-precision voltage sensor (15), the upper speed sensor (16), the middle speed sensor (17), the lower speed sensor (18), the upper photoelectric sensor (19), the middle photoelectric sensor (20), and the lower photoelectric sensor (21) are electrically connected to the input end of the filter (5), the output end of the filter (5) is electrically connected to the input end of the host computer (6), and the output end of the host computer (6) is electrically connected to the input end of the terminal (7);

[0009] Step 2: Based on the established test platform for the pantograph-catenary current collection quality stability under icing conditions, a state assessment method for the pantograph-catenary current collection quality stability under icing conditions was proposed, which includes the following steps:

[0010] S1: Define a time zero point. Starting from the time zero point, the upper Hall current sensor (10), the middle Hall current sensor (11) and the lower Hall current sensor (12) detect the current once every 0.2s. The detection time is 5 minutes, and a total of 1500 detections are performed. The detected current data is passed through the filter (5) to eliminate harmonics and then transmitted to the host computer (6). The host computer (6) calculates the average value of the current detected for the i-th time, I avi , unit is A:

[0011]

[0012] In formula (1), I 1i is the current value detected by the upper Hall current sensor (10) for the i-th time, I 2i is the current value detected by the middle Hall current sensor (11) for the i-th time, I 3i is the current value detected by the lower Hall current sensor (12) for the i-th time, and the above current units are all A;

[0013] S2: At the same time zero as the upper Hall current sensor (10), the middle Hall current sensor (11) and the lower Hall current sensor (12), starting from time zero, the upper high-precision voltage sensor (13), the middle high-precision voltage sensor (14) and the lower high-precision voltage sensor (15) detect the voltage once every 0.2s. The detection time is 5 minutes, and a total of 1500 detections are performed. The detected voltage data is passed through the filter (5) to eliminate harmonics and then transmitted to the host computer (6). The host computer (6) calculates the average value U of the voltage detected for the i-th time. avi , in V:

[0014]

[0015] In formula (2), U 1i is the voltage value detected by the upper high-precision voltage sensor (13) for the i-th time, U 2i is the voltage value detected by the middle high-precision voltage sensor (14) for the i-th time, U 3i is the voltage value detected by the lower high-precision voltage sensor (15) for the i-th time, and the above voltage units are all V;

[0016] S3: At the same time zero as the upper Hall current sensor (10), the middle Hall current sensor (11) and the lower Hall current sensor (12), starting from time zero, the upper speed sensor (16), the middle speed sensor (17) and the lower speed sensor (18) detect the speed once every 1 minute, the detection time is 5 minutes, and a total of five detections are performed. The detected speed data is passed through the filter (5) to eliminate harmonics and then transmitted to the host computer (6). The host computer (6) calculates the average value V of the speed detected for the i-th time. avi , in km / h:

[0017]

[0018] In formula (3), V 1i is the speed value detected by the upper speed sensor (16) for the i-th time, V 2i is the speed value detected by the middle speed sensor (17) for the i-th time, V 3i is the speed value detected by the lower speed sensor (18) for the i-th time, and the above speed units are all km / h;

[0019] Calculate the average speed V within 5 minutes av , in km / h:

[0020]

[0021] S4: At the same time zero as the upper Hall current sensor (10), the middle Hall current sensor (11) and the lower Hall current sensor (12), the upper photoelectric sensor (19), the middle photoelectric sensor (20) and the lower photoelectric sensor (21) continue to work for 5 minutes from time zero to detect the bow network offline time. The detected bow network offline time data is sent to the host computer (6) after the harmonics are eliminated by the filter (5). The average bow network offline time t is calculated in the host computer (6). av , unit is min:

[0022]

[0023] In formula (5), t1 is the bow-cat offline time detected by the upper photoelectric sensor (19), t2 is the bow-cat offline time detected by the middle photoelectric sensor (20), and t3 is the bow-cat offline time detected by the lower photoelectric sensor (21). The above time units are all min.

[0024] Calculate the average bow-net offline rate ρ:

[0025]

[0026] In formula (6), t is the total detection time, which is taken as 5 min here;

[0027] S1, S2, S3 and S4 are performed simultaneously;

[0028] S5: The I obtained in the host computer (6) avi 、U avi 、V av and ρ are input into terminal (7) to calculate the contact resistance R i , average contact resistance And the contact resistance variance S 2 , where resistance is in Ω:

[0029]

[0030] In formula (8), n is the total number of detections;

[0031] S6: Calculate the speed performance factor P v :

[0032] P v =-5.861e -10 V av 3 +2.188e -6 V av 2 -0.002176V av +1.057 (10)

[0033] S7: Calculate the contact resistance stability factor H r :

[0034] H r =3.891e 9 (S 2 ) 4 -4.479e 7 (S 2 ) 3 +1.412e 5 (S 2 ) 2 +97.99S 2 +0.09772 (11)

[0035] S8: Calculation of the pantograph-catenary current stability factor G under icing conditions w :

[0036] G w =P v ·H r (12)

[0037] Step 3: Based on the average pantograph-catenary offline rate ρ and pantograph-catenary current stability factor G calculated in S4 and S8 above wConduct stability assessment of the pantograph-catenary current collection quality under icing conditions:

[0038] When ρ∈(0, 0.05] and G w ∈(0,0.3] indicates that the pantograph-catenary current receiving quality is stable under ice conditions. When ρ∈(0,0.05] and G w ∈(0.3,0.5] indicates that the pantograph-catenary current receiving quality stability is normal under ice conditions. When ρ∈(0,0.05] and G w When ∈(0.5,1] or ρ∈(0.05,1], it indicates that the stability of the current receiving quality of the catenary is poor under ice coverage, and it is necessary to immediately implement de-icing and ice-melting operations for the catenary;

[0039] Step 4: Repeat the above operations to detect the stability of the pantograph current collection quality of trains in different locations and time periods under icing conditions.

[0040] The beneficial effects of the present invention are:

[0041] (1) Use multiple sensors and take the average value of the data measured by each sensor to minimize the error;

[0042] (2) Intelligent calculation and control can be completed through the host computer and the terminal, and data collection is convenient and efficient;

[0043] (3) It can more accurately evaluate the stability of the current-collecting quality of the catenary under icing conditions, so that timely measures can be taken to de-ice and melt the ice-covered catenary, thus ensuring the safe operation of the railway. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solution of the application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0045] Figure 1 This is a schematic diagram of a pantograph-catenary current collection quality stability test platform under icing conditions shown in this application; DETAILED DESCRIPTION

[0046] The following further describes the specific embodiments of the present invention with reference to the accompanying drawings. The present invention provides a method for evaluating the stability of the pantograph-catenary current-collecting quality under icing conditions. The technical solution for achieving the objectives of the present invention is as follows:

[0047] Step 1: Build a test platform for the stability of the current collection quality of the pantograph and the grid under icing conditions. The platform includes: a Hall current sensor (1), a high-precision voltage sensor (2), a speed sensor (3), a photoelectric sensor (4), a filter (5), a host computer (6), a terminal (7), a pantograph (8), and a train (9);

[0048] The Hall current sensor (1) includes an upper Hall current sensor (10), a middle Hall current sensor (11), and a lower Hall current sensor (12); the high-precision voltage sensor (2) includes an upper high-precision voltage sensor (13), a middle high-precision voltage sensor (14), and a lower high-precision voltage sensor (15); the speed sensor (3) includes an upper speed sensor (16), a middle speed sensor (17), and a lower speed sensor (18); and the photoelectric sensor (4) includes an upper photoelectric sensor (19), a middle photoelectric sensor (20), and a lower photoelectric sensor (21);

[0049] The upper Hall current sensor (10), the middle Hall current sensor (11) and the lower Hall current sensor (12) are installed on the frame of the pantograph (8); the upper high-precision voltage sensor (13), the middle high-precision voltage sensor (14) and the lower high-precision voltage sensor (15) are installed in parallel on both sides of the contact point of the pantograph (8); the upper speed sensor (16), the middle speed sensor (17) and the lower speed sensor (18) are fixed on the body of the train (9); the upper photoelectric sensor (19), the middle photoelectric sensor (20) and the lower photoelectric sensor (21) are installed on the side of the upper part of the pantograph (8); the filter (5), the host computer (6) and the terminal (7) are placed inside the train (9) compartment;

[0050] The output ends of the upper Hall current sensor (10), the middle Hall current sensor (11), the lower Hall current sensor (12), the upper high-precision voltage sensor (13), the middle high-precision voltage sensor (14), the lower high-precision voltage sensor (15), the upper speed sensor (16), the middle speed sensor (17), the lower speed sensor (18), the upper photoelectric sensor (19), the middle photoelectric sensor (20), and the lower photoelectric sensor (21) are electrically connected to the input end of the filter (5), the output end of the filter (5) is electrically connected to the input end of the host computer (6), and the output end of the host computer (6) is electrically connected to the input end of the terminal (7);

[0051] Step 2: Based on the established test platform for the pantograph-catenary current collection quality stability under icing conditions, a state assessment method for the pantograph-catenary current collection quality stability under icing conditions was proposed, which includes the following steps:

[0052] S1: Define a time zero point. Starting from the time zero point, the upper Hall current sensor (10), the middle Hall current sensor (11) and the lower Hall current sensor (12) detect the current once every 0.2s. The detection time is 5 minutes, and a total of 1500 detections are performed. The detected current data is passed through the filter (5) to eliminate harmonics and then transmitted to the host computer (6). The host computer (6) calculates the average value of the current detected for the i-th time, I avi , unit is A:

[0053]

[0054] In formula (13), I 1i is the current value detected by the upper Hall current sensor (10) for the i-th time, I 2i is the current value detected by the middle Hall current sensor (11) for the i-th time, I 3i is the current value detected by the lower Hall current sensor (12) for the i-th time, and the above current units are all A;

[0055] S2: At the same time zero as the upper Hall current sensor (10), the middle Hall current sensor (11) and the lower Hall current sensor (12), starting from time zero, the upper high-precision voltage sensor (13), the middle high-precision voltage sensor (14) and the lower high-precision voltage sensor (15) detect the voltage once every 0.2s. The detection time is 5 minutes, and a total of 1500 detections are performed. The detected voltage data is passed through the filter (5) to eliminate harmonics and then transmitted to the host computer (6). The host computer (6) calculates the average value U of the voltage detected for the i-th time. avi , in V:

[0056]

[0057] In formula (14), U 1i is the voltage value detected by the upper high-precision voltage sensor (13) for the i-th time, U 2i is the voltage value detected by the middle high-precision voltage sensor (14) for the i-th time, U 3i is the voltage value detected by the lower high-precision voltage sensor (15) for the i-th time, and the above voltage units are all V;

[0058] S3: At the same time zero as the upper Hall current sensor (10), the middle Hall current sensor (11) and the lower Hall current sensor (12), starting from time zero, the upper speed sensor (16), the middle speed sensor (17) and the lower speed sensor (18) detect the speed once every 1 minute, the detection time is 5 minutes, and a total of five detections are performed. The detected speed data is passed through the filter (5) to eliminate harmonics and then transmitted to the host computer (6). The host computer (6) calculates the average value V of the speed detected for the i-th time. avi , in km / h:

[0059]

[0060] In formula (15), V 1i is the speed value detected by the upper speed sensor (16) for the i-th time, V 2i is the speed value detected by the middle speed sensor (17) for the i-th time, V 3i is the speed value detected by the lower speed sensor (18) for the i-th time, and the above speed units are all km / h;

[0061] Calculate the average speed V within 5 minutes av , in km / h:

[0062]

[0063] S4: At the same time zero as the upper Hall current sensor (10), the middle Hall current sensor (11) and the lower Hall current sensor (12), the upper photoelectric sensor (19), the middle photoelectric sensor (20) and the lower photoelectric sensor (21) continue to work for 5 minutes from time zero to detect the bow network offline time. The detected bow network offline time data is sent to the host computer (6) after the harmonics are eliminated by the filter (5). The average bow network offline time t is calculated in the host computer (6). av , unit is min:

[0064]

[0065] In formula (17), t1 is the bow-cat offline time detected by the upper photoelectric sensor (19), t2 is the bow-cat offline time detected by the middle photoelectric sensor (20), and t3 is the bow-cat offline time detected by the lower photoelectric sensor (21). The above time units are all min.

[0066] Calculate the average bow-net offline rate ρ:

[0067]

[0068] In formula (18), t is the total detection time, which is taken as 5 min here;

[0069] S1, S2, S3 and S4 are performed simultaneously;

[0070] S5: The I obtained in the host computer (6) avi 、U avi 、V av and ρ are input into terminal (7) to calculate the contact resistance R i , average contact resistance And the contact resistance variance S 2 , where resistance is in Ω:

[0071]

[0072] In formula (20), n is the total number of detections;

[0073] S6: Calculate the speed performance factor P v :

[0074] P v =-5.861e -10 V av 3 +2.188e -6 V av 2 -0.002176V av +1.057 (22)

[0075] S7: Calculate the contact resistance stability factor H r :

[0076] H r =3.891e 9 (S 2 ) 4 -4.479e 7 (S 2 ) 3 +1.412e 5 (S 2 ) 2 +97.99S 2 +0.09772 (23)

[0077] S8: Calculation of the pantograph-catenary current stability factor G under icing conditions w :

[0078] G w =P v ·H r (twenty four)

[0079] Step 3: Based on the average pantograph-catenary offline rate ρ and pantograph-catenary current stability factor G calculated in S4 and S8 above wConduct stability assessment of the pantograph-catenary current collection quality under icing conditions:

[0080] When ρ∈(0, 0.05] and G w ∈(0,0.3] indicates that the pantograph-catenary current receiving quality is stable under ice conditions. When ρ∈(0,0.05] and G w ∈(0.3,0.5] indicates that the pantograph-catenary current receiving quality stability is normal under ice conditions. When ρ∈(0,0.05] and G w When ∈(0.5,1] or ρ∈(0.05,1], it indicates that the stability of the current receiving quality of the catenary is poor under ice coverage, and it is necessary to immediately implement de-icing and ice-melting operations for the catenary;

[0081] Step 4: Repeat the above operations to detect the stability of the pantograph current collection quality of trains in different locations and time periods under icing conditions.

Claims

1. A method for evaluating the stability of pantograph-catenary current collection quality under icing conditions, characterized in that: First, a test platform for the stability of the current collection quality of the pantograph and the grid under icing conditions is established, which includes: a Hall current sensor (1), a high-precision voltage sensor (2), a speed sensor (3), a photoelectric sensor (4), a filter (5), a host computer (6), a terminal (7), a pantograph (8), and a train (9); The Hall current sensor (1) includes an upper Hall current sensor (10), a middle Hall current sensor (11), and a lower Hall current sensor (12); the high-precision voltage sensor (2) includes an upper high-precision voltage sensor (13), a middle high-precision voltage sensor (14), and a lower high-precision voltage sensor (15); the speed sensor (3) includes an upper speed sensor (16), a middle speed sensor (17), and a lower speed sensor (18); and the photoelectric sensor (4) includes an upper photoelectric sensor (19), a middle photoelectric sensor (20), and a lower photoelectric sensor (21); The upper Hall current sensor (10), the middle Hall current sensor (11) and the lower Hall current sensor (12) are installed on the frame of the pantograph (8); the upper high-precision voltage sensor (13), the middle high-precision voltage sensor (14) and the lower high-precision voltage sensor (15) are installed in parallel on both sides of the contact point of the pantograph (8); the upper speed sensor (16), the middle speed sensor (17) and the lower speed sensor (18) are fixed on the body of the train (9); the upper photoelectric sensor (19), the middle photoelectric sensor (20) and the lower photoelectric sensor (21) are installed on the side of the upper part of the pantograph (8); the filter (5), the host computer (6) and the terminal (7) are placed inside the train (9) compartment; The output ends of the upper Hall current sensor (10), the middle Hall current sensor (11), the lower Hall current sensor (12), the upper high-precision voltage sensor (13), the middle high-precision voltage sensor (14), the lower high-precision voltage sensor (15), the upper speed sensor (16), the middle speed sensor (17), the lower speed sensor (18), the upper photoelectric sensor (19), the middle photoelectric sensor (20), and the lower photoelectric sensor (21) are electrically connected to the input end of the filter (5), the output end of the filter (5) is electrically connected to the input end of the host computer (6), and the output end of the host computer (6) is electrically connected to the input end of the terminal (7); The method for evaluating the stability of the pantograph-catenary current collecting quality under icing conditions is characterized by comprising the following steps: Step 1: Based on the established test platform for the pantograph-catenary current collection quality stability under icing conditions, a state assessment method for the pantograph-catenary current collection quality stability under icing conditions is proposed, which includes the following steps: S1: Define a time zero point. Starting from the time zero point, the upper Hall current sensor (10), the middle Hall current sensor (11) and the lower Hall current sensor (12) detect the current once every 0.2s. The detection time is 5 minutes, and a total of 1500 detections are performed. The detected current data is passed through the filter (5) to eliminate harmonics and then transmitted to the host computer (6). The host computer (6) calculates the average value of the current detected for the i-th time, I avi , unit is A: In formula (1), I 1i is the current value detected by the upper Hall current sensor (10) for the i-th time, I 2i is the current value detected by the middle Hall current sensor (11) for the i-th time, I 3i is the current value detected by the lower Hall current sensor (12) for the i-th time, and the above current units are all A; S2: At the same time zero as the upper Hall current sensor (10), the middle Hall current sensor (11) and the lower Hall current sensor (12), starting from time zero, the upper high-precision voltage sensor (13), the middle high-precision voltage sensor (14) and the lower high-precision voltage sensor (15) detect the voltage once every 0.2s. The detection time is 5 minutes, and a total of 1500 detections are performed. The detected voltage data is passed through the filter (5) to eliminate harmonics and then transmitted to the host computer (6). The host computer (6) calculates the average value U of the voltage detected for the i-th time. avi , in V: In formula (2), U 1i is the voltage value detected by the upper high-precision voltage sensor (13) for the i-th time, U 2i is the voltage value detected by the middle high-precision voltage sensor (14) for the i-th time, U 3i is the voltage value detected by the lower high-precision voltage sensor (15) for the i-th time, and the above voltage units are all V; S3: At the same time zero as the upper Hall current sensor (10), the middle Hall current sensor (11) and the lower Hall current sensor (12), starting from time zero, the upper speed sensor (16), the middle speed sensor (17) and the lower speed sensor (18) detect the speed once every 1 minute, the detection time is 5 minutes, and a total of five detections are performed. The detected speed data is passed through the filter (5) to eliminate harmonics and then transmitted to the host computer (6). The host computer (6) calculates the average value V of the speed detected for the i-th time. avi , in km / h: In formula (3), V 1i is the speed value detected by the upper speed sensor (16) for the i-th time, V 2i is the speed value detected by the middle speed sensor (17) for the i-th time, V 3i is the speed value detected by the lower speed sensor (18) for the i-th time, and the above speed units are all km / h; Calculate the average speed V within 5 minutes av , in km / h: S4: At the same time zero as the upper Hall current sensor (10), the middle Hall current sensor (11) and the lower Hall current sensor (12), the upper photoelectric sensor (19), the middle photoelectric sensor (20) and the lower photoelectric sensor (21) continue to work for 5 minutes from time zero to detect the bow network offline time. The detected bow network offline time data is sent to the host computer (6) after the harmonics are eliminated by the filter (5). The average bow network offline time t is calculated in the host computer (6). av , unit is min: In formula (5), t1 is the bow-cat offline time detected by the upper photoelectric sensor (19), t2 is the bow-cat offline time detected by the middle photoelectric sensor (20), and t3 is the bow-cat offline time detected by the lower photoelectric sensor (21). The above time units are all min. Calculate the average bow-net offline rate ρ: In formula (6), t is the total detection time, which is taken as 5 min here; S1, S2, S3 and S4 are performed simultaneously; S5: The I obtained in the host computer (6) avi 、U avi 、V av and ρ are input into terminal (7) to calculate the contact resistance R i , average contact resistance And the contact resistance variance S 2 , where resistance is in Ω: In formula (8), n is the total number of detections; S6: Calculate the speed performance factor P v : P v =-5.861e -10 In av 3 +2.188e -6 In av 2 -0.002176V av +1.057 (10) S7: Calculate the contact resistance stability factor H r : H r =3.891e 9 (S 2 ) 4 -4.479e 7 (S 2 ) 3 +1.412e 5 (S 2 ) 2 +97.99S 2 +0.09772 (11) S8: Calculation of the pantograph-catenary current stability factor G under icing conditions w : G w =P v ·H r (12) Step 2: Based on the average pantograph-catenary offline rate ρ and pantograph-catenary current stability factor G calculated in S4 and S8 above w Conduct stability assessment of the pantograph-catenary current collection quality under icing conditions: When ρ∈(0, 0.05] and G w ∈(0,0.3] indicates that the pantograph-catenary current receiving quality is stable under ice conditions. When ρ∈(0,0.05] and G w ∈(0.3,0.5] indicates that the pantograph-catenary current receiving quality stability is normal under ice conditions. When ρ∈(0,0.05] and G w When ∈(0.5,1] or ρ∈(0.05,1], it indicates that the stability of the current receiving quality of the catenary is poor under ice coverage, and it is necessary to immediately implement de-icing and ice-melting operations for the catenary; Step 3: Repeat the above operations to detect the stability of the pantograph current-collecting quality of trains in different locations and time periods under icing conditions.

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