State evaluation method for pantograph catenary current collection quality stability under icing condition

Abstract

The invention discloses a state evaluation method for pantograph-catenary current collection quality stability under an icing condition. The method comprises the following steps: firstly, building a pantograph-catenary current collection quality stability test platform under the icing condition; on the basis of the established test platform, pantograph-catenary current collection quality stability parameters under the icing condition are obtained through measurement of all the sensors; according to parameters measured by the sensor, the average pantograph net offline rate rho, the speed performance factor Pv, the contact resistance stability factor Hr and the pantograph net current collection stability factor Gw under the icing condition are calculated, and finally the state evaluation of the pantograph net current collection quality stability under the icing condition is carried out. According to the method, the stability of the current collection quality of the pantograph catenary under the icing condition can be accurately evaluated, so that measures can be taken in time to carry out deicing and ice melting operation on the icing catenary, and safe operation of a railway is guaranteed.

Description

Technical Field

[0001] The 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 the development of economy and society and the improvement of people's living standards, the demand for electrified railway transportation is growing. The quality of the current collection of the bow and the catenary is one of the conditions for assessing the safety of high-speed railway operation. The contact network is exposed to the natural environment for a long time. In winter or at high altitudes, the contact network is prone to ice, which affects the normal current collection of the bow and the catenary contact system. The icing of the contact network will not only reduce the stability of the current collection quality of the bow and the catenary, but also cause arcing of the bow and the catenary, aggravate the dancing of the bow and the catenary, and in severe cases may also cause damage to the contact network equipment, such as serious accidents such as the bow of the contact line falling off and the break of the contact line. Icing is closely related to the quality of the current collection of the bow and the catenary. Therefore, in the case of icing, it can be judged whether de-icing measures need to be implemented immediately based on the quality of the current collection of the bow and the catenary. Therefore, it is very important to monitor the stability of the current collection quality of the bow and the catenary under the condition of icing of the contact network in real time.

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

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

[0005] Step 1: Building a test platform for the stability of the current collecting quality of the pantograph network under ice conditions, the platform comprising: 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), a train (9), an upper Hall current sensor (10), a middle Hall current sensor (11), a lower Hall current sensor (12), an upper high-precision voltage sensor (13), a middle high-precision voltage sensor (14), a lower high-precision voltage sensor (15), an upper speed sensor (16), a middle speed sensor (17), a lower speed sensor (18), an upper photoelectric sensor (19), a middle photoelectric sensor (20), and a lower photoelectric sensor (21);

[0006] The Hall current sensor (1) comprises 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) comprises 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) comprises an upper speed sensor (16), a middle speed sensor (17), and a lower speed sensor (18); and the photoelectric sensor (4) comprises 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); and 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 stability of the pantograph-catenary current receiving quality under icing conditions, a state assessment method for the stability of the pantograph-catenary current receiving quality under icing conditions is 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 0.2 seconds. The detection time is 5 minutes, and a total of 1500 detections are performed. The detected current data is sent to the host computer (6) after the harmonics are eliminated through the filter (5). The average value I of the current detected for the i-th time is calculated in the host computer (6). 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 point as the upper Hall current sensor (10), the middle Hall current sensor (11), and the lower Hall current sensor (12), starting from time zero point, 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 0.2 seconds, the detection time is 5 minutes, and a total of 1500 detections are performed. The detected voltage data is sent to the host computer (6) after the harmonics are eliminated through the filter (5). The average value U of the voltage detected for the i-th time is calculated in the host computer (6). 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 ith time, and the above voltage units are all V;

[0016] S3: At the same time zero point as the upper Hall current sensor (10), the middle Hall current sensor (11), and the lower Hall current sensor (12), 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 a 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 at 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 ith 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 point 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 , in min:

[0022]

[0023] In formula (5), t1 is the bow-net offline time detected by the upper photoelectric sensor (19), t2 is the bow-net offline time detected by the middle photoelectric sensor (20), and t3 is the bow-net 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 , ρ are input into terminal (7) to calculate the contact resistance R i , average contact resistance 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 offline rate ρ and pantograph current stability factor G calculated by S4 and S8 above w Conduct stability assessment of the pantograph-catenary current-collecting 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 icing conditions. When ρ∈(0,0.05] and G w ∈(0.3,0.5] indicates that the quality stability of the pantograph-catenary current collection under icing is generally good. When ρ∈(0,0.05] and G w ∈(0.5,1] or ρ∈(0.05,1] indicates that the stability of the current receiving quality of the catenary is poor under icing conditions, and it is necessary to immediately perform deicing and ice-melting operations on the contact network;

[0039] Step 4: Repeat the above operation to detect the stability of the pantograph current-collecting 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 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 contact network, 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 specific implementation of the present invention is further described below in conjunction with the accompanying drawings. The present invention provides a state evaluation method for the stability of the current receiving quality of the pantograph and the catenary under icing conditions. The technical solution for achieving the purpose of the present invention is as follows:

[0047] Step 1: Building a test platform for the stability of the current collecting quality of the pantograph network under ice conditions, the platform comprising: 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), a train (9), an upper Hall current sensor (10), a middle Hall current sensor (11), a lower Hall current sensor (12), an upper high-precision voltage sensor (13), a middle high-precision voltage sensor (14), a lower high-precision voltage sensor (15), an upper speed sensor (16), a middle speed sensor (17), a lower speed sensor (18), an upper photoelectric sensor (19), a middle photoelectric sensor (20), and a lower photoelectric sensor (21);

[0048] The Hall current sensor (1) comprises 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) comprises 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) comprises an upper speed sensor (16), a middle speed sensor (17), and a lower speed sensor (18); and the photoelectric sensor (4) comprises 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); and 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 stability of the pantograph-catenary current receiving quality under icing conditions, a state assessment method for the stability of the pantograph-catenary current receiving quality under icing conditions is 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 0.2 seconds. The detection time is 5 minutes, and a total of 1500 detections are performed. The detected current data is sent to the host computer (6) after the harmonics are eliminated through the filter (5). The average value I of the current detected for the i-th time is calculated in the host computer (6). 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 point as the upper Hall current sensor (10), the middle Hall current sensor (11), and the lower Hall current sensor (12), starting from time zero point, 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 0.2 seconds, the detection time is 5 minutes, and a total of 1500 detections are performed. The detected voltage data is sent to the host computer (6) after the harmonics are eliminated through the filter (5). The average value U of the voltage detected for the i-th time is calculated in the host computer (6). 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 ith time, and the above voltage units are all V;

[0058] S3: At the same time zero point as the upper Hall current sensor (10), the middle Hall current sensor (11), and the lower Hall current sensor (12), 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 a 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 at 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 ith 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 point 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 , in min:

[0064]

[0065] In formula (17), t1 is the bow-net offline time detected by the upper photoelectric sensor (19), t2 is the bow-net offline time detected by the middle photoelectric sensor (20), and t3 is the bow-net 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 , ρ are input into terminal (7) to calculate the contact resistance R i , average contact resistance 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 offline rate ρ and pantograph current stability factor G calculated by S4 and S8 above w Conduct stability assessment of the pantograph-catenary current-collecting 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 icing conditions. When ρ∈(0,0.05] and G w ∈(0.3,0.5] indicates that the quality stability of the pantograph-catenary current collection under icing is generally good. When ρ∈(0,0.05] and G w ∈(0.5,1] or ρ∈(0.05,1] indicates that the stability of the current receiving quality of the catenary is poor under icing conditions, and it is necessary to immediately perform deicing and ice-melting operations on the contact network;

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

Claims

1. A method for evaluating the stability of the current receiving quality of the pantograph and the catenary under icing conditions, characterized in that: Firstly, a test platform for the stability of the current collecting quality of the bow-net under ice-covered conditions is established, and the test platform comprises: 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), a train (9), an upper Hall current sensor (10), a middle Hall current sensor (11), a lower Hall current sensor (12), an upper high-precision voltage sensor (13), a middle high-precision voltage sensor (14), a lower high-precision voltage sensor (15), an upper speed sensor (16), a middle speed sensor (17), a lower speed sensor (18), an upper photoelectric sensor (19), a middle photoelectric sensor (20), and a lower photoelectric sensor (21); The Hall current sensor (1) comprises 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) comprises 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) comprises an upper speed sensor (16), a middle speed sensor (17), and a lower speed sensor (18); and the photoelectric sensor (4) comprises 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); and 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 receiving quality under icing conditions is characterized by comprising the following steps: Step 1: Based on the established test platform for the stability of the pantograph-catenary current receiving quality under icing conditions, a state assessment method for the stability of the pantograph-catenary current receiving quality 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 0.2 seconds. The detection time is 5 minutes, and a total of 1500 detections are performed. The detected current data is sent to the host computer (6) after the harmonics are eliminated through the filter (5). The average value I of the current detected for the i-th time is calculated in the host computer (6). 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 point as the upper Hall current sensor (10), the middle Hall current sensor (11), and the lower Hall current sensor (12), starting from time zero point, 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 0.2 seconds, the detection time is 5 minutes, and a total of 1500 detections are performed. The detected voltage data is sent to the host computer (6) after the harmonics are eliminated through the filter (5). The average value U of the voltage detected for the i-th time is calculated in the host computer (6). 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 ith 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), 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 a 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 at 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 ith 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 point 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 , in min: In formula (5), t1 is the bow-net offline time detected by the upper photoelectric sensor (19), t2 is the bow-net offline time detected by the middle photoelectric sensor (20), and t3 is the bow-net 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 , ρ are input into terminal (7) to calculate the contact resistance R i , average contact resistance 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 offline rate ρ and pantograph current stability factor G calculated by S4 and S8 above w Conduct stability assessment of the pantograph-catenary current-collecting 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 icing conditions. When ρ∈(0,0.05] and G w ∈(0.3,0.5] indicates that the quality stability of the pantograph-catenary current collection under icing is generally good. When ρ∈(0,0.05] and G w ∈(0.5,1] or ρ∈(0.05,1] indicates that the stability of the current receiving quality of the catenary is poor under icing conditions, and it is necessary to immediately perform deicing and ice-melting operations on the contact network; Step 3: Repeat the above operation 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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