Method for evaluating icing and current collection quality of overhead line system based on photoelectric factors

Abstract

The invention discloses a method for evaluating the icing current collection quality of a contact network based on photoelectric factors. Comprising the following steps: establishing a pantograph-catenary current collection quality monitoring platform under the condition that the catenary is iced, measuring voltage, measuring current, calculating a contact resistance standard deviation, measuring arc light intensity, calculating a photoelectric factor, and evaluating the current collection quality between the catenary and a pantograph under the condition that the catenary is iced. The method has the advantages that the pantograph net current collection quality monitoring platform under the icing condition of the overhead line system is built, the voltage, the seawater temperature and the seawater flow velocity are measured, the current collection quality of the pantograph net under the icing condition is evaluated by calculating the photoelectric factors, and the method is simple and efficient and can accurately evaluate the current collection quality of the pantograph net under the icing condition.

Description

Technical Field

[0001] The invention belongs to the field of catenary ice-covered bow-net current-collecting quality assessment, and in particular relates to a method for assessing the catenary ice-covered bow-net current-collecting quality based on photoelectric factors. Background Art

[0002] Reliable pantograph (pantograph) network (contact network) current collection is the basis for ensuring high-speed and high-density operation of trains. However, icing of the contact network is an important factor affecting the current collection of the pantograph network. In my country's vast terrain, most areas where the "eight vertical and eight horizontal" high-speed rail trunk lines pass through often face temperatures below freezing in winter, which makes the problem of contact network icing more and more prominent, becoming an important obstacle to the safe, stable and efficient operation of high-speed railways.

[0003] Existing evaluation methods usually focus on mechanical and electrical characteristics, and can only evaluate the current-collecting quality of the catenary from a single characterization factor, lacking a systematic analysis of the photoelectric characteristics. The photoelectric factor can effectively reflect the arc intensity and current flow state, providing a new evaluation method for the current-collecting quality of the contact network under icing conditions. Therefore, it is particularly necessary to propose a method for evaluating the current-collecting quality of the contact network under icing conditions based on the photoelectric factor. This method combines photoelectric monitoring technology to monitor the arc intensity under icing conditions in real time, and conducts a comprehensive analysis based on voltage and current data. By establishing an effective evaluation model, the current-collecting quality of the contact network can be accurately judged, thereby providing a scientific basis for the stable operation of high-speed railways and ensuring safety and reliability under severe weather conditions. This method can not only improve the monitoring capability of the contact network status, but also provide an important reference for the future design and maintenance of the contact network. Summary of the invention

[0004] This method is an evaluation method for the current collecting quality of the contact network under ice coverage based on the photoelectric factor. The method is simple and convenient to operate, and can accurately evaluate the current collecting quality of the contact network under ice coverage by calculating the photoelectric factor.

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

[0006] 1. A method for evaluating the quality of ice-covered contact network current collection based on photoelectric factors, characterized by comprising:

[0007] Step 1: Establish a platform for monitoring the quality of the catenary current collection under the condition of catenary icing

[0008] A platform for monitoring the quality of pantograph current collection under the condition of catenary ice is constructed. The platform mainly comprises a power supply (1), a temperature control test chamber (2), a wind speed simulator (3), a fixed pole tower (4), a contact line (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-factor integrated controller (13), a multi-factor 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), wherein:

[0009] The power supply (1) is connected to the temperature control test box (2) to supply power to the equipment in the temperature control test box (2); the water chiller (19) is connected to the water tank (18) through a pipe (17); the rainfall simulator (15) can simulate rainfall inside the temperature control test box (2); the multi-factor integrated controller (13) is installed on the outer wall of the temperature control test box (2) to control the temperature, wind speed and rainfall inside the temperature control test box (2); the multi-factor integrated monitoring device (14) is installed in the temperature control test box (2) to monitor the temperature, humidity, wind speed and rainfall inside the temperature control test box (2); the AC A power supply (10), a switch (20), a load (12), a contact wire (5), a pantograph (6) and a 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 contact 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; and 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 time zero, the voltage monitoring probe (7) detects the voltage once every 0.5s. The detection time is 5min, and a total of 600 detections are recorded as V i , i=1,2,3,…,600 (unit: V);

[0012] Step 3: Measure the current

[0013] At the same time zero as the voltage monitoring probe (7), starting from time zero, the current transformer (8) detects the current once every 0.5s, the detection time is 5min, and a total of 600 detections are recorded as I i , i=1,2,3,…,600 (unit: A);

[0014] Step 4: Calculation of contact resistance standard deviation

[0015] According to the obtained Vi and I i Data calculation of contact resistance R i (Unit: Ω), average contact resistance μ R (Unit: Ω) and standard deviation σ R (Unit: Ω), the calculation formula is as follows:

[0016]

[0017] Step 5: Measure the arc intensity

[0018] At the same time zero as the voltage monitoring probe (7), the light intensity monitoring probe (16) detects the arc light intensity every 0.5s from time zero. The detection time is 5min, and a total of 600 detections are recorded as L i ,i=1,2,3,…,600(Unit: W / m 2 ), the average arc intensity is calculated as follows:

[0019]

[0020] Step 6: Calculate the photoelectric factor δ. The specific calculation formula is as follows:

[0021] δ=10σ R L avg (5)

[0022] Step 7: Evaluate the current collection quality between the overhead contact network and the pantograph under icing conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It shows the schematic diagram of the test platform structure for the current-collecting quality of the contact network under icing conditions.

[0024] Figure 2 It shows a flow chart for evaluating the quality of ice-covered contact network current collection based on photoelectric factors. DETAILED DESCRIPTION

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

[0026] 1. A method for evaluating the quality of ice-covered contact network current collection based on photoelectric factors, characterized by comprising:

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

[0028] A platform for monitoring the quality of pantograph current collection under the condition of catenary ice is constructed. The platform mainly comprises a power supply (1), a temperature control test chamber (2), a wind speed simulator (3), a fixed pole tower (4), a contact line (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-factor integrated controller (13), a multi-factor 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), wherein:

[0029] The power supply (1) is connected to the temperature control test box (2) to supply power to the equipment in the temperature control test box (2); the water chiller (19) is connected to the water tank (18) through a pipe (17); the rainfall simulator (15) can simulate rainfall inside the temperature control test box (2); the multi-factor integrated controller (13) is installed on the outer wall of the temperature control test box (2) to control the temperature, wind speed and rainfall inside the temperature control test box (2); the multi-factor integrated monitoring device (14) is installed in the temperature control test box (2) to monitor the temperature, humidity, wind speed and rainfall inside the temperature control test box (2); the AC A power supply (10), a switch (20), a load (12), a contact wire (5), a pantograph (6) and a 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 contact 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; and 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 time zero, the voltage monitoring probe (7) detects the voltage once every 0.5s. The detection time is 5min, and a total of 600 detections are recorded as V i , i=1,2,3,…,600 (unit: V);

[0032] Step 3: Measure the current

[0033] At the same time zero as the voltage monitoring probe (7), starting from time zero, the current transformer (8) detects the current once every 0.5s, the detection time is 5min, and a total of 600 detections are recorded as I i , i=1,2,3,…,600 (unit: A);

[0034] Step 4: Calculation of contact resistance standard deviation

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

[0036]

[0037] Step 5: Measure the arc intensity

[0038] At the same time zero as the voltage monitoring probe (7), the light intensity monitoring probe (16) detects the arc light intensity every 0.5s from time zero. The detection time is 5min, and a total of 600 detections are recorded as L i ,i=1,2,3,…,600(Unit: W / m 2 ), the average arc intensity is calculated as follows:

[0039]

[0040] Step 6: Calculate the photoelectric factor δ. The specific calculation formula is as follows:

[0041] δ=10σ R L avg (5)

[0042] Step 7: Evaluate the current-collecting quality between the overhead contact network and the pantograph under icing conditions

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

Claims

1. A method for evaluating the quality of ice-covered contact network based on photoelectric factors, characterized in that: include: Step 1: Establish a platform for monitoring the quality of the catenary current collection under the condition of catenary icing A platform for monitoring the quality of pantograph current collection under the condition of catenary ice is constructed. The platform mainly comprises a power supply (1), a temperature control test chamber (2), a wind speed simulator (3), a fixed pole tower (4), a contact line (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-factor integrated controller (13), a multi-factor 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), wherein: The power supply (1) is connected to the temperature control test box (2) to supply power to the equipment in the temperature control test box (2); the water chiller (19) is connected to the water tank (18) through a pipe (17); the rainfall simulator (15) can simulate rainfall inside the temperature control test box (2); the multi-factor integrated controller (13) is installed on the outer wall of the temperature control test box (2) to control the temperature, wind speed and rainfall inside the temperature control test box (2); the multi-factor integrated monitoring device (14) is installed in the temperature control test box (2) to monitor the temperature, humidity, wind speed and rainfall inside the temperature control test box (2); the AC A power supply (10), a switch (20), a load (12), a contact wire (5), a pantograph (6) and a 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 contact 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; and 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); Step 2: Measure the voltage Define a time zero point. Starting from time zero, the voltage monitoring probe (7) detects the voltage once every 0.5s. The detection time is 5min, and a total of 600 detections are recorded as V i , i=1,2,3,…,600 (unit: V); Step 3: Measure the Current At the same time zero as the voltage monitoring probe (7), starting from time zero, the current transformer (8) detects the current once every 0.5s, the detection time is 5min, and a total of 600 detections are recorded as I i , i=1,2,3,…,600 (unit: A); Step 4: Calculation of contact resistance standard deviation According to the obtained V i and I i Data calculation of contact resistance R i (Unit: Ω), average contact resistance μ R (Unit: Ω) and standard deviation σ R (Unit: Ω), the calculation formula is as follows: Step 5: Measure the arc intensity At the same time zero as the voltage monitoring probe (7), the light intensity monitoring probe (16) detects the arc light intensity every 0.5s from time zero. The detection time is 5min, and a total of 600 detections are recorded as L i ,i=1,2,3,…,600(Unit: W / m 2 ), the average arc intensity is calculated as follows: Step 6: Calculate the photoelectric factor δ. The specific calculation formula is as follows: δ=10σ R L avg (5) Step 7: Evaluate the current collection quality between the overhead contact network and the pantograph under icing conditions.

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