An evaluation method for the current collection quality of catenary icing based on optoelectronic factors

Abstract

The present invention discloses an evaluation method for the current collection quality of an overhead catenary under icing based on optoelectronic factors, comprising the following steps: establishing a monitoring platform for the current collection quality of the pantograph-catenary under catenary icing, measuring voltage, measuring current, calculating the standard deviation of contact resistance, measuring arc light intensity, calculating optoelectronic factors, and evaluating the current collection quality between the catenary and the pantograph under icing. The beneficial effects of the present invention are as follows: by building a monitoring platform for the current collection quality of the pantograph-catenary under catenary icing, measuring voltage, current and arc light intensity, and evaluating the current collection quality of the pantograph-catenary under icing by calculating optoelectronic factors, this method is simple and efficient and can accurately evaluate the current collection quality of the pantograph-catenary under icing.

Description

Technical Field

[0001] The present invention belongs to the field of catenary icing pantograph - current collection quality assessment, and particularly relates to an assessment method for catenary icing current collection quality based on optoelectronic factors. Background Art

[0002] Reliable pantograph (current collector) - catenary (overhead line) current collection is the basis for ensuring high - speed and high - density train operation. However, catenary icing is an important factor affecting pantograph - catenary current collection. In the vast terrain of our country, most of the areas traversed by the "eight vertical and eight horizontal" high - speed rail main lines often face low temperatures below the freezing point in winter, which makes the problem of catenary icing more prominent and becomes an important obstacle restricting the safe, stable and efficient operation of high - speed railways.

[0003] Existing assessment methods usually focus on mechanical and electrical characteristics, and can only evaluate pantograph - catenary current collection quality from a single characterization factor, lacking a systematic analysis of optoelectronic characteristics. The optoelectronic factor can effectively reflect the arc light intensity and current flow state, providing a new assessment means for the current collection quality under catenary icing conditions. Therefore, it is particularly necessary to propose an assessment method for catenary icing current collection quality based on optoelectronic factors. This method combines optoelectronic monitoring technology to real - time monitor the arc light intensity under icing conditions and comprehensively analyze it in combination with voltage and current data. By establishing an effective assessment model, the current collection quality of the catenary can be accurately judged, providing a scientific basis for the stable operation of high - speed railways and ensuring safety and reliability under adverse weather conditions. This method can not only improve the monitoring ability of the catenary state but also provide an important reference for future catenary design and maintenance. Summary of the Invention

[0004] This method is an assessment method for catenary icing current collection quality based on optoelectronic factors. The method is simple and convenient to operate, and can accurately assess the catenary current collection quality under icing conditions by calculating optoelectronic factors.

[0005] The technical solution of the present invention is as follows:

[0006] 1. An assessment method for catenary icing current collection quality based on optoelectronic factors, characterized by comprising:

[0007] The first step: Establish a monitoring platform for pantograph - catenary current collection quality under catenary icing conditions

[0008] Build a monitoring platform for the current collection quality of the pantograph-catenary system under catenary icing conditions. The platform mainly consists of a power supply (1), a temperature control test chamber (2), a wind speed simulator (3), a fixed pole tower (4), a catenary wire (5), a pantograph (6), a voltage monitoring probe (7), a current transformer (8), a vibration table (9), an AC power supply (10), a recorder (11), a load (12), a multi-element integrated controller (13), a multi-element integrated monitoring device (14), a rainfall simulator (15), a light intensity monitoring probe (16), a pipeline (17), a water tank (18), a chiller (19), and a switch (20). Among them:

[0009] The power supply (1) is connected to the temperature control test chamber (2) to supply power to the equipment inside the temperature control test chamber (2); the chiller (19) is connected to the water tank (18) through the pipeline (17); the rainfall simulator (15) can simulate rainfall inside the temperature control test chamber (2); the multi-element integrated controller (13) is installed on the outer wall of the temperature control test chamber (2) to control the temperature, wind speed, and rainfall inside the temperature control test chamber (2); the multi-element integrated monitoring device (14) is installed in the temperature control test chamber (2) to monitor the temperature, humidity, wind speed, and rainfall inside the temperature control test chamber (2); the AC power supply (10), the switch (20), the load (12), the catenary wire (5), the pantograph (6), and the vibration table (9) form a circuit; the vibration table (9) can move left and right at different speeds to simulate the running conditions of the EMU; the voltage monitoring probe (7) is used to measure the voltage between the catenary wire (5) and the pantograph (6); the current transformer (8) is used to measure the current in the circuit; the light intensity monitoring probe (16) is used to monitor the arc light intensity; the recorder (11) is used to record the signals collected by the voltage monitoring probe (7), the light intensity monitoring probe (16), and the current transformer (8);

[0010] Step 2: Measure the voltage

[0011] Define a time zero point. Starting from the time zero point, the voltage monitoring probe (7) measures the voltage every 0.5 s for a detection time of 5 min, with a total of 600 measurements, denoted as V i , where i = 1, 2, 3,..., 600, and the unit is V;

[0012] Step 3: Measure the current

[0013] At the same time zero point as the voltage monitoring probe (7), starting from the time zero point, the current transformer (8) measures the current every 0.5 s for a detection time of 5 min, with a total of 600 measurements, denoted as I i , where i = 1, 2, 3,..., 600, and the unit is A;

[0014] Step 4: Calculate the standard deviation of the contact resistance

[0015] According to the obtained Vi and I i Calculate the contact resistance R of the data i , with the unit of Ω, the average contact resistance μ R , with the unit of Ω, and the standard deviation σ R , with the unit of Ω, and the calculation formula is as follows:

[0016]

[0017] Step 5: Measure the arc light intensity

[0018] At the same time zero point as the voltage monitoring probe (7), starting from the time zero point, the light intensity monitoring probe (16) measures the arc light intensity every 0.5 s for 5 min, with a total of 600 measurements, denoted as L i , where i = 1, 2, 3,..., 600, with the unit of W / m 2 , and the calculation of the average arc light intensity is as follows:

[0019]

[0020] Step 6: Calculate the optoelectronic factor δ, and the specific calculation formula is as follows:

[0021] δ = 10σ R L avg (5)

[0022] Step 7: Evaluate the current collection quality between the catenary and the pantograph under icing conditions. Description of the Drawings

[0023] Figure 1 It shows a schematic diagram of the test platform structure for the current collection quality of the catenary under icing conditions.

[0024] Figure 2 It shows a flow chart for evaluating the current collection quality of the catenary under icing conditions based on the optoelectronic factor. Detailed Embodiments

[0025] The present invention will be further described below in conjunction with the drawings and specific implementation procedures.

[0026] 1. An evaluation method for the current collection quality of a catenary under icing conditions based on the optoelectronic factor, characterized in that it includes:

[0027] Step 1: Establish a monitoring platform for the current collection quality of the pantograph-catenary under catenary icing conditions

[0028] Build a monitoring platform for the current collection quality of the pantograph-catenary system under catenary icing conditions. The platform mainly consists of a power supply (1), a temperature control test chamber (2), a wind speed simulator (3), a fixed pole tower (4), a catenary wire (5), a pantograph (6), a voltage monitoring probe (7), a current transformer (8), a vibration table (9), an AC power supply (10), a recorder (11), a load (12), a multi-element integrated controller (13), a multi-element integrated monitoring device (14), a rainfall simulator (15), a light intensity monitoring probe (16), a pipeline (17), a water tank (18), a chiller (19), and a switch (20). Among them:

[0029] The power supply (1) is connected to the temperature control test chamber (2) to supply power to the equipment inside the temperature control test chamber (2); the chiller (19) is connected to the water tank (18) through the pipeline (17); the rainfall simulator (15) can simulate rainfall inside the temperature control test chamber (2); the multi-element integrated controller (13) is installed on the outer wall of the temperature control test chamber (2) to control the temperature, wind speed, and rainfall inside the temperature control test chamber (2); the multi-element integrated monitoring device (14) is installed in the temperature control test chamber (2) to monitor the temperature, humidity, wind speed, and rainfall inside the temperature control test chamber (2); the AC power supply (10), the switch (20), the load (12), the catenary wire (5), the pantograph (6), and the vibration table (9) form a circuit; the vibration table (9) can move left and right at different speeds to simulate the operating conditions of the EMU; the voltage monitoring probe (7) is used to measure the voltage between the catenary wire (5) and the pantograph (6); the current transformer (8) is used to measure the current in the circuit; the light intensity monitoring probe (16) is used to monitor the arc light intensity; the recorder (11) is used to record the signals collected by the voltage monitoring probe (7), the light intensity monitoring probe (16), and the current transformer (8);

[0030] Step 2: Measure the voltage

[0031] Define a time zero point. Starting from the time zero point, the voltage monitoring probe (7) measures the voltage every 0.5 s for a detection time of 5 min, with a total of 600 measurements, denoted as V i , where i = 1, 2, 3,..., 600, and the unit is V;

[0032] Step 3: Measure the current

[0033] At the same time zero point as the voltage monitoring probe (7), starting from the time zero point, the current transformer (8) measures the current every 0.5 s for a detection time of 5 min, with a total of 600 measurements, denoted as I i , where i = 1, 2, 3,..., 600, and the unit is A;

[0034] Step 4: Calculate the standard deviation of the contact resistance

[0035] According to the obtained Vi and I i Data calculates the contact resistance R i , with the unit of Ω, the average contact resistance μ R , with the unit of Ω, and the standard deviation σ R , with the unit of Ω, and the calculation formula is as follows:

[0036]

[0037] Step 5: Measure the arc light intensity

[0038] At the same time zero point as the voltage monitoring probe (7), starting from the time zero point, the light intensity monitoring probe (16) measures the arc light intensity every 0.5 s for 5 min, with a total of 600 measurements, denoted as L i , i = 1, 2, 3, …, 600, with the unit of W / m 2 , and the calculation of the average arc light intensity is as follows:

[0039]

[0040] Step 6: Calculate the optoelectronic factor δ, and the specific calculation formula is as follows:

[0041] δ = 10σ R L avg (5)

[0042] Step 7: Evaluate the current collection quality between the catenary and the pantograph under icing conditions

[0043] If 0 < δ ≤ 0.071, it indicates that the current collection quality between the catenary and the pantograph is excellent; if 0.071 < δ ≤ 1.039, it indicates that the current collection quality between the catenary and the pantograph is medium; if δ > 1.039, it indicates that the current collection quality between the catenary and the pantograph is poor, and it is urgent to use ice melting technology to melt the ice on the contact wire.

Claims

1. An evaluation method for the current collection quality of an overhead catenary under icing based on optoelectronic factors, characterized in that, Including: The first step: Establish a monitoring platform for the current collection quality of the pantograph-catenary system under catenary icing conditions Build a monitoring platform for the current collection quality of the pantograph-catenary system under catenary icing conditions. This platform mainly consists of a power supply (1), a temperature control test chamber (2), a wind speed simulator (3), a fixed pole tower (4), a catenary wire (5), a pantograph (6), a voltage monitoring probe (7), a current transformer (8), a vibration table (9), an AC power supply (10), a recorder (11), a load (12), a multi-element integrated controller (13), a multi-element integrated monitoring device (14), a rainfall simulator (15), a light intensity monitoring probe (16), a pipeline (17), a water tank (18), a chiller (19), and a switch (20). Among them: The power supply (1) is connected to the temperature control test chamber (2) to supply power to the equipment inside the temperature control test chamber (2); the chiller (19) is connected to the water tank (18) through the pipeline (17); the rainfall simulator (15) can simulate rainfall inside the temperature control test chamber (2); the multi-element integrated controller (13) is installed on the outer wall of the temperature control test chamber (2) to control the temperature, wind speed, and rainfall inside the temperature control test chamber (2); the multi-element integrated monitoring device (14) is installed in the temperature control test chamber (2) to monitor the temperature, humidity, wind speed, and rainfall inside the temperature control test chamber (2); the AC power supply (10), the switch (20), the load (12), the catenary wire (5), the pantograph (6), and the vibration table (9) form a circuit; the vibration table (9) can move left and right at different speeds to simulate the operating conditions of the EMU; the voltage monitoring probe (7) is used to measure the voltage between the catenary wire (5) and the pantograph (6); the current transformer (8) is used to measure the current of the circuit; the light intensity monitoring probe (16) is used to monitor the arc light intensity; the recorder (11) is used to record the signals collected by the voltage monitoring probe (7), the light intensity monitoring probe (16), and the current transformer (8); The second step: Measure the voltage Define a time zero point. Starting from the time zero point, the voltage monitoring probe (7) detects the voltage every 0.5 s for a detection time of 5 min, with a total of 600 detections, denoted as V i , where i = 1, 2, 3, …, 600, and the unit is V; The third step: Measure the current At the same time zero point as the voltage monitoring probe (7), starting from the time zero point, the current transformer (8) detects the current every 0.5 s for a detection time of 5 min, with a total of 600 detections, denoted as I i , where i = 1, 2, 3, …, 600, and the unit is A; The fourth step: Calculate the standard deviation of the contact resistance According to the obtained V i and I i calculate the contact resistance R i , with the unit of Ω, the average contact resistance μ R , with the unit of Ω, and Standard deviation σ R , with the unit of Ω, and the calculation formula is as follows: The fifth step: Measure the arc light intensity At the same zero time point as the voltage monitoring probe (7), starting from the zero time point, the arc light intensity monitoring probe (16) measures the arc light intensity every 0.5 s for 5 min, with a total of 600 measurements, denoted as L i , where i = 1, 2, 3, …, 600, and the unit is W / m 2 . The calculation of the average arc light intensity is as follows: The sixth step: Calculate the optoelectronic factor δ, and the specific calculation formula is as follows: δ = 10σ R L avg (5) The seventh step: Evaluate the current collection quality between the catenary and the pantograph under icing conditions.

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