An evaluation method for the operating stability of catenary icing considering the water droplet collision coefficient

Abstract

The present invention provides a method for evaluating the operation stability of an overhead catenary under icing conditions considering the water droplet collision coefficient, which is characterized in that an overhead catenary icing test platform considering the water droplet collision coefficient is built, and the steps for evaluating the operation stability of the overhead catenary under icing conditions are as follows: set the wind speed, water droplet diameter in the test chamber and the line voltage applied to the conductor on the upper computer, and change the wind speed, water droplet diameter in the test chamber and the line voltage applied to the conductor set on the upper computer. Identify and measure the area enclosed by the water droplets on the release plane and the area enclosed by the water droplets hitting the surface of the overhead catenary through a high-definition camera, so as to obtain an important index for measuring the ability of the overhead catenary to capture water droplets - the water droplet collision coefficient. Repeat the steps to obtain m groups of test data of the overhead catenary icing thickness parameters; calculate the theoretical value of the overhead catenary icing thickness parameters, then optimize the theoretical calculation formula of the overhead catenary icing thickness parameters, and finally calculate the evaluation factor of the overhead catenary operation stability under icing conditions and evaluate the operation stability of the overhead catenary under icing conditions.

Description

Technical Field

[0001] The present invention relates to the field of catenary operation icing stability evaluation, and particularly to a catenary icing operation stability evaluation method considering the water droplet collision coefficient. Background Art

[0002] With the continuous improvement of the high-speed rail network and the continuous improvement of the operation level, the catenary, as a key component of the high-speed rail traction power supply system, its performance and state directly affect the operation efficiency of high-speed rail trains. In recent years, due to the frequent occurrence of extremely cold weather, catenary icing will seriously affect its electrical conductivity, resulting in poor contact between the pantograph and the catenary of the train, and even phenomena such as power failure, short circuit, and spark. This will not only damage the catenary and the pantograph, but may also cause damage to the power system of the train, resulting in train suspension or accidents. Therefore, it is very necessary to evaluate the catenary icing operation stability.

[0003] At present, although there are various catenary risk assessment methods, these methods have some defects and deficiencies and have not been widely promoted and applied. For example, traditional assessment methods are mostly based on empirical models or physical models, and do not fully consider dynamic factors in the actual environment, such as the influence of wind speed, electric field, and rainfall on the catenary icing process. In addition, these methods often lack accurate calculation and real-time monitoring of key parameters, resulting in insufficient accuracy and reliability of the assessment results. In view of the above problems, the present invention provides a catenary icing operation stability evaluation method considering the water droplet collision coefficient, and conducts an analytical evaluation on the catenary icing operation stability considering different wind speeds, electric fields, and rainfall diameters in the actual environment, providing important support for the stability and reliability of the high-speed rail system. Summary of the Invention

[0004] In order to more accurately evaluate the catenary icing operation stability analytically, the present invention provides a catenary icing operation stability evaluation method considering the water droplet collision coefficient. The technical solutions for achieving the purpose of the present invention are as follows:

[0005] First, build a test platform, which includes: a host computer (1), a working voltage generation controller (2), a working voltage generator (3), a switch (4), a high-voltage-resistant cable (9), a simulated rainfall device (5), a high-definition intelligent monitoring and measurement integration device (6), a catenary model (7), a wind duct system (8), a test chamber (10), a data acquisition device (11), and a comprehensive grounding device (12);

[0006] The bottom grounding end of the catenary model (7) is connected to the comprehensive grounding device (12), and the catenary model (7) is placed inside the test chamber (10);

[0007] The trigger interface of the working voltage generation controller (2) is connected to the input end of the working voltage generator (3), the host computer (1) is connected to the control end of the working voltage generation controller (2), the output end of the working voltage generator (3) is connected to the input end of the switch (4) through a high-voltage resistant cable (9), and the output end of the switch (4) is connected to the input end of the catenary model (7);

[0008] The simulated rainfall device (5), the high-definition intelligent monitoring and measurement integrated device (6), and the air duct system (8) are fixed inside the test chamber;

[0009] The host computer (1) is connected to the simulated rainfall device (5) and the air duct system (8);

[0010] The input end of the high-definition intelligent monitoring and measurement integrated device (6) is connected to the data acquisition device (11), and the output end of the data acquisition device (11) is connected to the host computer (1);

[0011] The above catenary icing operation stability evaluation method considering the water droplet collision coefficient includes the following steps:

[0012] First step: Close the switch (4), and send wind speed, raindrop diameter, and voltage setting signals to the air duct system (8), the simulated rainfall device (5), and the working voltage generation controller (2) respectively through the host computer (1). The air duct system (8), the simulated rainfall device (5), and the working voltage generation controller (2) execute the corresponding instructions. The high-definition intelligent monitoring and measurement integrated device (6) identifies and measures the area S0 enclosed by the water droplets released on the ground in the test chamber and the area S enclosed by the water droplets hitting the catenary surface, and transmits them to the host computer (1) through the data acquisition device (11), and the water droplet collision coefficient γ;

[0013] Continue to monitor the icing condition of the catenary model (7) through the high-definition intelligent monitoring and measurement integrated device (6) and transmit it to the host computer (1) through the data acquisition device (11);

[0014] Adjust the switch to disconnect it, change the wind speed v, raindrop diameter d, and voltage E in the test chamber. The change range of the wind speed v is controlled within 0 m / s to 5 m / s, the raindrop diameter d is taken in the range of 100 to 1000 μm, and the voltage E is selected in the range of 0 to 35 kV. Repeat the first step above to obtain m groups of test working current intensity parameter data;

[0015] Second step: Calculate the catenary water droplet collision coefficient γ under the wind speed v, raindrop diameter d, and voltage E:

[0016]

[0017] In the formula, γ is the catenary water droplet collision coefficient, v is the wind speed, d is the raindrop diameter, and E is the voltage;

[0018] Calculate the icing operation stability factor η of the catenary under different water droplet collision coefficients γ:

[0019]

[0020] Where e in formula (2) is the natural logarithm.

[0021] The third step: Evaluation of the icing operation stability of the catenary

[0022] When η ∈ (0, 0.05), it indicates that the catenary operates stably; when η ∈ (0.05, +∞), it indicates that the icing thickness of the catenary is too large and de-icing is required as soon as possible.

[0023] The beneficial effects of the present invention are as follows:

[0024] 1) By building an icing operation stability evaluation platform for the catenary, it can effectively simulate the actual environmental conditions of the catenary under different wind speeds, electric fields, and raindrop diameters, with strong practicality.

[0025] 2) It can complete intelligent operation and control through the upper computer, facilitating data collection, accurate and efficient, and having universality for evaluating the icing operation stability of the catenary under different complex environmental conditions.

[0026] 3) It can improve the theoretical calculation strategy and effectively conduct an analytical evaluation of the icing operation stability of the catenary under different wind speeds, electric fields, and raindrop diameters. Description of the Drawings

[0027] Figure 1 is a schematic diagram of the overall platform structure of the present invention; Detailed Embodiments

[0028] The following further describes the detailed embodiments of the present invention in conjunction with the drawings. The detailed embodiments of an evaluation method for the icing operation stability of a catenary considering the water droplet collision coefficient include the following steps:

[0029] The first step is to close the switch (4). The upper computer (1) sends wind speed, raindrop diameter, and voltage setting signals to the air duct system (8), the simulated rainfall device (5), and the working voltage generation controller (2) respectively. The air duct system (8), the simulated rainfall device (5), and the working voltage generation controller (2) execute the corresponding instructions. The high-definition intelligent monitoring and measurement integration device (6) identifies and measures the area S0 enclosed by the water droplets released on the ground and the area S enclosed by the water droplets hitting the catenary surface in the test chamber, and transmits them to the upper computer (1) through the data acquisition device (11), and the water droplet collision coefficient γ;

[0030] Continue to monitor the icing condition of the catenary model (7) through the high-definition intelligent monitoring and measurement integrated device (6), and transmit it to the upper computer (1) through the data acquisition device (11);

[0031] Adjust the switch to disconnect it, and change the wind speed v, raindrop diameter d, and voltage E in the test chamber. The change range of the wind speed v is controlled within 0 m / s to 5 m / s, the raindrop diameter d ranges from 100 to 1000 μm, and the selected voltage E ranges from 0 to 35 kV. Repeat the first step above to obtain m sets of test working current intensity parameter data;

[0032] Step 2: Calculate the catenary water droplet collision coefficient γ under the wind speed v, raindrop diameter d, and voltage E:

[0033]

[0034] In the formula, γ is the catenary water droplet collision coefficient, v is the wind speed, d is the raindrop diameter, and E is the voltage;

[0035] Calculate the icing operation stability factor η of the catenary under different water droplet collision coefficients γ:

[0036]

[0037] Where e in formula (2) is the natural logarithm.

[0038] Step 3: Evaluate the icing operation stability of the catenary,

[0039] When η ∈ (0, 0.05), it indicates that the catenary operates stably; when η ∈ (0.05, +∞), it indicates that the icing thickness of the catenary is too large and de-icing is required as soon as possible.

Claims

1. A method for evaluating the operating stability of an overhead catenary under icing conditions considering the water droplet collision coefficient, characterized in that, It includes a host computer (1), a working voltage generation controller (2), a working voltage generator (3), a switch (4), an artificial rainfall device (5), a high-definition intelligent monitoring and measurement integrated device (6), an overhead catenary model (7), an air duct system (8), a high-voltage resistant cable (9), a test chamber (10), a data acquisition device (11), and a comprehensive grounding device (12); The bottom grounding end of the overhead catenary model (7) is connected to the comprehensive grounding device (12), and the overhead catenary model (7) is placed inside the test chamber (10); The trigger interface of the working voltage generation controller (2) is connected to the input end of the working voltage generator (3), the host computer (1) is connected to the control end of the working voltage generation controller (2), the output end of the working voltage generator (3) is connected to the input end of the switch (4) through the high-voltage resistant cable (9), and the output end of the switch (4) is connected to the input end of the overhead catenary model (7); The artificial rainfall device (5), the high-definition intelligent monitoring and measurement integrated device (6), and the air duct system (8) are fixed inside the test chamber; The host computer (1) is connected to the artificial rainfall device (5) and the air duct system (8); The high-definition intelligent monitoring and measurement integrated device (6) is connected to the input end of the data acquisition device (11), and the output end of the data acquisition device (11) is connected to the host computer (1); The above-mentioned method for evaluating the operation stability of an overhead catenary under icing considering the water droplet collision coefficient includes the following steps: The first step: Close the switch (4), and send wind speed, rain droplet diameter, and voltage setting signals to the air duct system (8), the artificial rainfall device (5), and the working voltage generation controller (2) respectively through the host computer (1). The air duct system (8), the artificial rainfall device (5), and the working voltage generation controller (2) execute the corresponding instructions. The high-definition intelligent monitoring and measurement integrated device (6) identifies and measures the area S0 enclosed by the water droplets released on the ground in the test chamber and the area S enclosed by the water droplets hitting the surface of the overhead catenary, and transmits them to the host computer (1) through the data acquisition device (11), and the water droplet collision coefficient γ; Continue to monitor the icing condition of the overhead catenary model (7) through the high-definition intelligent monitoring and measurement integrated device (6), and transmit it to the host computer (1) through the data acquisition device (11); Adjust the switch to make it open, change the wind speed v, rain droplet diameter d, and voltage E in the test chamber. The change range of the wind speed v is controlled within 0 m / s to 5 m / s, the value of the rain droplet diameter d is taken from 100 to 1000 μm, and the selected value of the voltage E is from 0 to 35 kV. Repeat the above first step to obtain m groups of test working current intensity parameter data; The second step: Calculate the water droplet collision coefficient γ of the overhead catenary under the wind speed v, rain droplet diameter d, and voltage E: In the formula, γ is the water droplet collision coefficient of the overhead catenary, v is the wind speed, d is the rain droplet diameter, and E is the voltage; Calculate the icing operation stability factor η of the overhead catenary under different water droplet collision coefficients γ: Where e in formula (2) is the natural logarithm; The third step: Evaluate the operation stability of the overhead catenary under icing When η ∈ (0, 0.05), it represents the stable operation of the catenary; when η ∈ (0.05, +∞), it represents that the ice thickness on the catenary is too large and de-icing is required as soon as possible.

Images