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Device and method for detecting and elevating contact network state based on electrical capacity analysis

An evaluation method and evaluation device technology, applied in the direction of overhead lines, etc., can solve the problems of conflicting dynamic detection and static detection and evaluation results, confusion of on-site maintenance work, buried safety operation, etc., and achieve intuitive judgment method, small size, and good performance. status effect

Inactive Publication Date: 2012-08-01
EAST CHINA JIAOTONG UNIVERSITY
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  • Summary
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  • Application Information

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Problems solved by technology

These two detection methods are to measure the geometric parameters of the catenary structure, and judge the state of the catenary through the relationship between the geometric parameters and the standard value, which is an indirect evaluation method; in some cases, dynamic detection and static The contradictory test and evaluation results bring confusion to the on-site maintenance work and bury hidden dangers for safe operation

Method used

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  • Device and method for detecting and elevating contact network state based on electrical capacity analysis
  • Device and method for detecting and elevating contact network state based on electrical capacity analysis
  • Device and method for detecting and elevating contact network state based on electrical capacity analysis

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Effect test

Embodiment 1

[0059] Embodiment 1. Pantograph-catenary arc detection based on wavelet analysis

[0060] When a pantograph-catenary arc occurs in the traction power supply circuit, a transient high-frequency signal will appear in the power supply circuit. The high-frequency signal has its regularity, so the detection of the pantograph-catenary arc can be realized by using the high-frequency signal.

[0061] The transient signal generated by the arc has the characteristics of high frequency and instantaneous mutation, and the wavelet transform just meets the requirements of this signal analysis. The high-frequency detail component of the pantograph-catenary arc transient signal can be obtained by using wavelet transform, and the high-frequency component produced by the arc can be used as the feature quantity to realize the detection of the pantograph-catenary arc.

[0062] Using wavelet decomposition can effectively extract the high-frequency component of the arc current when the locomotive ...

Embodiment 2

[0070] Embodiment 2: Arc evaluation based on wavelet relative energy entropy.

[0071] The smoothness of the contact line has an impact on the generated arc. The higher the degree of roughness, the worse the ability of the pantograph to follow the contact line, and the longer the pantograph-catenary arc generated. Therefore, through the evaluation of the pantograph-catenary arc , which can measure the smoothness of the contact line.

[0072] Since the pantograph-catenary arc is generated in a complex environment, and the arc is constantly developing and changing with the movement of the pantograph, a feasible method is to use the energy consumed in the arc as the basis for judging the strength of the arc.

[0073] Because the arc current is affected by the load of the locomotive, it is not comprehensive enough to evaluate the degree of the arc by using the high frequency component of the arc current alone. When the pantograph-catenary arc is longer, the arc discharge is more ...

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Abstract

The invention discloses a device and a method for detecting and evaluating the contact network state based on electrical capacity analysis and relates to a method for detecting and evaluating the electrified railway contact network state. The technical scheme adopted by the invention is as follows: the method comprises the following steps: acquiring voltage and current signals: converting the voltage and the current of the contact network to obtain a signal by an optical electronic transformer, converting the obtained signal into an electrical signal by a photoelectric detector, feeding the electrical signal into a signal conditioning circuit and carrying out amplification, filtering, A / D (Analogue / Digital) conversion, isolation and digital sampling on the electrical signal; processing the voltage and current signals: extracting a high-frequency component of the voltage and current signals, which is obtained by sampling, and carrying out computing processing on the high-frequency component; and estimating the contact network: according to the calculation result, evaluating the work state of the contact network and giving out an evaluation result. According to the method and the device disclosed by the invention, the detecting and evaluating result is accurate, the state of the contact network can be better grasped and the state overhaul of the contact network is facilitated to be realized.

Description

technical field [0001] The invention relates to a detection and evaluation method for the state of an electrified railway catenary. Background technique [0002] The proportion of electrified railway in railway transportation is gradually increasing, and its importance is becoming more and more prominent. As a facility for power supply to electric locomotives, catenary has become a weak link of electrified railway due to the harsh working environment and no backup. In recent years, my country has just In the early stage of operation, some passenger dedicated lines have experienced train delays due to catenary failures, resulting in large economic losses and adverse social impacts. [0003] Accurate evaluation of catenary status is conducive to guiding the condition maintenance of catenary equipment, improving the operation and management level of catenary, thereby reducing the probability of failure, reducing the maintenance cost of catenary equipment, and improving the relia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60M1/28
Inventor 程宏波伦利王勋
Owner EAST CHINA JIAOTONG UNIVERSITY
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