CN108535598B - Online detection method and device for cable fault of track circuit - Google Patents
Online detection method and device for cable fault of track circuit Download PDFInfo
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- CN108535598B CN108535598B CN201810333255.8A CN201810333255A CN108535598B CN 108535598 B CN108535598 B CN 108535598B CN 201810333255 A CN201810333255 A CN 201810333255A CN 108535598 B CN108535598 B CN 108535598B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
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Abstract
The invention relates to a method and a device for online detection of a fault of a track circuit cable, wherein the method comprises the following steps: acquiring electrical parameters of a track circuit self signal from one or two of first equipment and second equipment; calculating according to the collected electrical parameters to obtain a fault measurement value; and comparing the fault measurement value with reference values corresponding to different positions of the cable to determine the position of a fault point. Through the technical scheme of the invention, the method and the device are effectively suitable for online detection of the fault, and achieve the technical effect of more accurate fault positioning.
Description
Technical Field
The invention relates to the technical field of rail transit, in particular to a method and a device for detecting a rail circuit cable fault on line.
Background
ZPW-2000A is the main basic equipment of train control system, and has been widely used in common railway and high-speed railway system at present. One of the characteristics of the track circuit is that the system is extended to 15km from indoor to outdoor, and indoor and outdoor equipment are connected through cables. The cable transmits audio signals in a frequency range of 1700-2600Hz, and distributed capacitance exists between cable cores and between the cores and the ground.
In daily use, once an open circuit or short circuit fault occurs to a cable, on-site maintenance personnel are difficult to accurately judge the position of the fault due to complex electrical characteristics. Even if the fault is determined to be caused by a cable, an accurate fault point needs to be found in a range as long as 15km at most, which is difficult to realize in engineering overhaul.
In order to detect the cable fault and find the exact fault position, an off-line cable fault position finding device is currently adopted. For example, it is now common to apply frequency-sweep signals to a cable, then collect a voltage time-domain signal of each frequency-sweep frequency input signal and a current time-domain signal looped through an insulating layer of the cable, and then calculate the frequency-domain impedance and phase of the cable according to the collected signals. This detection method applies a detection signal to the cable, if the cable is operating normally, for example, in ZPW-2000A, and the cable is transmitting 1700-2600Hz audio signal, which is the own signal normally transmitted by the cable. Due to the introduction of the detection signal, interference is generated on the self signal. The premise of using the detection mode is that the equipment on two sides of the cable needs to be suspended, and the detection equipment and the detection method cannot be suitable for ZPW-2000A equipment and cannot realize online real-time judgment of cable faults. There are also cable fault location methods that detect short circuit currents, etc. and the location of such faults is not accurate.
Disclosure of Invention
The invention provides a method and a device for on-line detection of cable faults of a track circuit, aiming at the technical problem that the on-line detection and accurate fault location of cables used by ZPW-2000A can not be realized in the prior art.
An on-line detection method for track circuit cable faults, comprising the following steps:
acquiring electrical parameters of a track circuit self signal from one or two of first equipment and second equipment;
calculating according to the collected electrical parameters to obtain a fault measurement value;
and comparing the fault measurement value with reference values corresponding to different positions of the cable to determine the position of a fault point.
Furthermore, the first device is a branching collector, and the second device is a communication interface board.
Further, the electrical parameters of the track circuit self-signal collected from the first device include: cable side voltage information and current information;
the electrical parameters collected from the second device include: power out voltage and power out current information.
And further, calculating according to ohm's law to obtain the fault measurement value.
Further, the fault measurement value is an impedance modulus value.
Further, the reference value is obtained by:
determining, by a simulation system, the reference values of the cable at different locations thereof based on one or more characteristic parameters of the cable trough, the soil characteristics, the bridge.
Further, the reference value is an impedance modulus value.
An on-line rail circuit cable fault detection device, the device comprising:
the detection unit is used for acquiring the electrical parameters of the self signals of the track circuit from one or two of the first equipment and the second equipment;
the calculating unit is used for calculating a fault measured value according to the electrical parameters collected by the detecting unit;
and the analysis unit is used for comparing the fault measurement value with reference values corresponding to different positions of the cable so as to determine the position of a fault point.
Further, the device also comprises a storage unit,
the storage unit is used for storing the reference value.
Further, the device also comprises an output unit,
and the output unit is used for outputting the determined fault point information.
The technical scheme of the invention is effectively suitable for the ZPW-2000A equipment to carry out real-time detection, and realizes the technical effect of more accurate fault location. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 shows a schematic diagram of a cable fault on-line detection system according to an embodiment of the invention;
FIG. 2 shows a schematic structural diagram of a cable fault detection device according to an embodiment of the invention;
FIG. 3 shows a schematic diagram of a standard value curve according to an embodiment of the invention;
fig. 4 shows a basic flow diagram of a cable fault detection arrangement detecting a fault point according to an embodiment of the invention;
FIG. 5 is a schematic diagram illustrating a comparison of a measured calculated value to a normalized value curve to determine a fault point, according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the cable fault on-line detection system according to the embodiment of the present invention is configured such that a cable fault detection apparatus is connected to a branching collector through a CAN (controller area network) bus to realize real-time acquisition of voltage and current information of a cable-side track circuit of the branching collector, where the self signal includes an audio signal or a digital signal transmitted in a cable between a track circuit transceiver and a track, and for example, the self signal uploaded by the branching collector to the cable fault detection apparatus mainly includes four signals with different frequencies, i.e., 1700Hz, 2000Hz, 2300Hz, and 2600 Hz; the cable fault detection device is also connected with the communication interface board through a CAN bus or an RJ45 interface, so that the output voltage and the output current information of the self signal of the track circuit uploaded by the communication interface board CAN be acquired in real time, namely, the voltage and the current information output by the transmitter are acquired; the cable fault detection device is further connected with an upper computer through a data connecting line, and fault information is sent to the upper computer so as to be displayed on a user output interface of the upper computer.
And simulating the electrical characteristics of the cable at different positions under the conditions of open circuit and short circuit by using the track circuit simulation system to obtain an electrical characteristic reference value and form an electrical characteristic curve. The electrical characteristic reference value comprises electrical parameters such as ground distributed capacitance, impedance, inductive reactance, voltage, current and the like.
Due to the fact that the distributed capacitance exists on the ground of the cable, and the distributed capacitance generated when the cable is laid in different sections such as a cable groove, soil and a bridge is different, when simulation is conducted through the track circuit simulation system, comprehensive simulation is conducted by considering factors such as different cable grooves, soil characteristics and bridges, accuracy of simulation data is improved, and reliable reference is provided for subsequent cable fault location.
According to the embodiment of the invention, the self signal transmitted in the cable is detected by the cable fault detection device, and the impedance module value is determined based on the self signal and then compared with the reference value. As shown in fig. 2, which shows a schematic structural diagram of a cable fault detection device according to an embodiment of the present invention, as shown in the figure, the cable fault detection device mainly includes a control unit, a detection unit, a calculation unit, an analysis unit, a storage unit, and an output unit.
As an exemplary schematic diagram, as shown in fig. 3, a standard value curve, i.e., a reference value curve in an ideal state where the separation distance is minimum in the case of an open circuit and a short circuit, which is obtained by simulation by the above-described track circuit simulation system, is schematically shown. It can be seen from this schematic simulation curve that the simulated impedance moduli for the open circuit and short circuit conditions are different and vary with distance. After the simulation parameters are obtained through simulation by the simulation system, the cable fault detection device may store the obtained simulation parameters in a storage unit thereof.
The control unit of the cable fault detection device of the embodiment of the invention distinguishes two devices, namely the branching collector and the communication interface board, and controls the detection unit to respectively collect one or more electrical parameters including voltage parameters, current parameters and the like in the two devices, namely the branching collector and the communication interface board. Fig. 4 shows a basic flow chart of the cable fault detection device for detecting a fault point, and as shown in the figure, a detection unit of the cable fault detection device detects actual electrical parameters such as voltage, current and the like of a signal of a cable. Specifically, the detection unit collects electrical parameters such as voltage parameters and current parameters of the cable side track circuit self signal of the branching collector. The detection unit sends the detected electrical parameters to a calculation unit of the cable fault detection device, and the calculation unit calculates measured values. Specifically, the calculating unit calculates and obtains an impedance modulus value Z according to ohm's law based on the voltage and current information detected by the detecting unit, and sends the impedance modulus value Z to the analyzing unit, so that the analyzing unit determines the fault position of the cable according to the calculated impedance modulus value Z and the simulation parameters.
Illustratively, in the case of an open circuit, the computing unit in the cable fault detection device calculates the impedance modulus value Z1 according to the collected voltage and current information, and sends the calculated impedance modulus value Z1 to the analysis unit.
After receiving the impedance module value Z1 from the computing unit, the analyzing unit in the cable fault detection apparatus reads the stored simulation curve parameters from the storage unit, obtains the impedance module value Z1 from the computing unit, and compares the impedance module value Z1 with the simulation curve parameters, as shown in fig. 5. Finally, the distance L1 corresponding to the impedance module value Z1 is determined as the fault position of the cable. The analysis unit can also determine the fault position of the cable by searching the distance L1 corresponding to the impedance module value Z1 in the storage unit. In the embodiment of the invention, in the fault detection process of the cable, as the self signal of the track circuit is used and other signals are not introduced, the real-time detection can be carried out, and the detection is safer and more reliable. And because the actually measured data is compared with the simulation data of the relevant position, the accuracy of fault positioning can be improved.
The simulation parameters obtained by the simulation system are only used for fault location judgment of the cable, and certain deviation exists, and preferably in the embodiment of the invention, the simulation result of the simulation by the simulation system and the field measurement result of the field measurement can be combined to determine electrical parameters of different sections, such as the voltage, the circuit and the distributed capacitance electrical parameters. And finally, selecting the mean value of the simulated and physically measured electrical parameter values as a standard value.
For the short circuit situation, the fault point can also be located in the above manner, and the invention is not described herein again.
It should be noted that fig. 3 is an idealized simulation curve diagram, and the curve of the impedance modulus shows a continuous extension. In practical engineering, an impedance point value curve may be obtained at a certain distance (for example, 100 meters), a correspondence table or a point value-wise relationship diagram of the impedance mode values and the distance may be formed, and the correspondence table and the relationship diagram may be stored in a storage unit in the circuit fault detection apparatus.
After the above-mentioned calculating unit obtains the impedance module value Z1, the analyzing unit determines which impedance module value in the correspondence table is closest to the impedance module value Z1 obtained by the calculating unit, and determines the distance L1' corresponding to the impedance module value closest to the impedance module value Z1 as the fault position.
The cable fault detection device can acquire the voltage and current information of the self signal of the track circuit on the branching collector or the communication interface board in real time according to a control instruction, and can also acquire the voltage and current information of the self signal of the track circuit on the branching collector or the communication interface board simultaneously. Preferably, the cable fault detection device collects the voltage and current information of the signal of the cable side track circuit of the branch line collector preferentially. When the system is not provided with the branching collector, the control unit of the cable fault detection device controls the detection unit to realize the real-time collection of the output voltage and the output current information of the self signal of the track circuit uploaded by the communication interface board and send the information to the calculation unit. And after the calculation unit acquires the work output voltage and work output current information from the detection unit, the impedance module value Z2 is obtained through calculation according to ohm's law and is sent to the analysis unit. After the analysis unit obtains the impedance module value Z2 from the calculation unit, the analysis unit reads the stored simulation curve parameters from the storage unit and compares the impedance module value Z2 with the simulation curve parameters. And finally, determining the distance corresponding to the impedance module value Z2 or the distance corresponding to the impedance module value closest to the impedance module value Z2 as the fault position L2 of the cable.
After the fault position and the fault type are determined, the output unit of the cable fault detection device sends the fault position and the fault type to an upper computer through a network or a data line, and an output interface of the upper computer displays the fault position and the fault type so as to visually display the fault position and the fault type for a user, and the purpose of alarming is effectively achieved.
According to the fault detection method provided by the embodiment of the invention, as the self signal of the track circuit is used and no additional detection signal is introduced into the cable to be detected, the self signal of the track circuit normally transmitted in the cable cannot be interfered, so that the detection is safer, and the purpose of real-time detection can be achieved. The theoretical parameters of different distances in the cable are obtained through simulation results or simulation results combined with field measurement results, and the actually measured data and the theoretical parameters are compared and analyzed, so that the cable fault positioning is more accurate. The cable fault is measured in real time and reported to the upper computer, so that a processor can be informed to process in time, and the field fault processing efficiency is effectively improved.
It should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. The two steps before and after do not necessarily mean a sequential execution order, and do not necessarily mean that other steps not listed in the present invention are necessarily excluded as long as the technical problem of the present invention can be solved. The lines between devices, modules and units in the description and drawings do not necessarily represent direct electrical connections, but rather represent logical relationships. The various elements, modules and devices in the specification are not necessarily indicative of a hardware implementation, and software modules and firmware modules may be suitable for use in the present invention. Meanwhile, "first", "second", and the like in the present invention do not indicate a sort of order but merely identify relevant units, devices, and the like.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. An on-line detection method for track circuit cable faults, comprising the following steps:
the method comprises the following steps of simulating the electrical characteristics of a cable at different positions under the conditions of open circuit and short circuit through a track circuit simulation system to obtain an electrical characteristic reference value and form an electrical characteristic curve; wherein,
based on the difference of distributed capacitance generated when the cable is laid in different sections of a cable trough, soil or a bridge, the reference value is obtained by the following method:
determining the reference values of the cable at different positions thereof by a simulation system based on one or more characteristic parameters of the cable trough, soil characteristics, and the bridge;
collecting the electrical parameters of the track circuit self signals from one or two of a branching collector and a communication interface board, wherein the self signals comprise audio signals or digital signals transmitted in cables between track circuit transceiver and a track, and the track circuit self signals uploaded by the branching collector comprise four signals with different frequencies of 1700Hz, 2000Hz, 2300Hz and 2600 Hz;
selecting the mean value of the simulated and actually measured electrical parameter values as a standard value, and forming a standard value curve;
calculating to obtain a fault measurement value according to the collected electrical parameters, wherein the fault measurement value is an impedance module value;
and comparing the fault measurement value with reference values corresponding to different positions of the cable, wherein the fault measurement value obtained by actual measurement calculation is compared with a standard value curve to determine the position of a fault point, and the position corresponding to the impedance module value is positioned as the position of the fault point.
2. The track circuit cable fault on-line detection method of claim 1,
the electrical parameters of the track circuit self signal collected by the branching collector comprise: cable side voltage information and current information;
the electrical parameters collected from the communication interface board include: power out voltage and power out current information.
3. The track circuit cable fault on-line detection method of claim 1,
and calculating according to ohm's law to obtain the fault measurement value.
4. The track circuit cable fault on-line detection method of claim 1,
the reference value is an impedance modulus value.
5. An on-line rail circuit cable fault detection device, the device comprising:
the track circuit simulation system is used for simulating the electrical characteristics of the cable at different positions under the conditions of open circuit and short circuit, obtaining an electrical characteristic reference value and forming an electrical characteristic curve; wherein,
based on the difference of distributed capacitance generated when the cable is laid in different sections of a cable trough, soil or a bridge, the reference value is obtained by the following method:
determining the reference values of the cable at different positions thereof by a simulation system based on one or more characteristic parameters of the cable trough, soil characteristics, and the bridge;
the detection unit is used for collecting the electrical parameters of the signals of the track circuit from one or two of the branching collector and the communication interface board; wherein the self signal comprises an audio signal or a digital signal transmitted in a cable between the track circuit transceiver and the track; the self signals of the track circuit uploaded by the branching collector comprise four signals with different frequencies of 1700Hz, 2000Hz, 2300Hz and 2600 Hz;
the calculation unit is used for calculating a fault measurement value according to the electrical parameters collected by the detection unit, wherein the fault measurement value is an impedance module value;
the track circuit simulation system is also used for selecting the mean value of the simulated and actually measured electrical parameter values as a standard value and forming a standard value curve;
and the analysis unit is used for comparing the fault measurement value with reference values corresponding to different positions of the cable, wherein the fault measurement value obtained by actual measurement calculation is compared with a standard value curve to determine the position of a fault point, and the position corresponding to the impedance module value is positioned as the position of the fault point.
6. The track circuit cable fault on-line detection device of claim 5, further comprising a storage unit,
the storage unit is used for storing the reference value.
7. The track circuit cable fault on-line detection device of claim 5, further comprising an output unit,
and the output unit is used for outputting the determined fault point information.
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| CN109342880A (en) * | 2018-10-23 | 2019-02-15 | 东莞市慧眼数字技术有限公司 | A kind of cable fault detection method and system |
| CN111626416A (en) * | 2020-04-24 | 2020-09-04 | 黑龙江瑞兴科技股份有限公司 | Automatic rail circuit fault diagnosis method based on deep convolutional neural network |
| CN113029562B (en) * | 2021-03-17 | 2024-07-23 | 中国航发动力股份有限公司 | Detection method and detection device for load state of screw transmission mechanism |
| CN113514733B (en) * | 2021-09-07 | 2021-12-31 | 中国南方电网有限责任公司超高压输电公司广州局 | Fault positioning method and device, computer equipment and storage medium |
| CN114537470B (en) * | 2022-02-11 | 2023-06-30 | 北京全路通信信号研究设计院集团有限公司 | Fault analysis method and system based on-line data |
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| WO2008134998A1 (en) * | 2007-05-08 | 2008-11-13 | Siemens Aktiengesellschaft | Method for determining an adjustment value indicating a ground impedance and measurement device |
| CN203958189U (en) * | 2014-01-03 | 2014-11-26 | 上海铁大电信设备有限公司 | A kind of railway section track circuit comprehensive monitor system |
| CN203965563U (en) * | 2014-01-03 | 2014-11-26 | 上海铁大电信设备有限公司 | A kind of railway section track circuit comprehensive monitor system off-premises station acquisition terminal |
| CN105866510B (en) * | 2016-05-17 | 2023-06-06 | 卡斯柯信号有限公司 | Monitoring system for railway outdoor trackside signal equipment |
| CN205749647U (en) * | 2016-05-17 | 2016-11-30 | 卡斯柯信号有限公司 | Monitoring system for railway outdoor trackside signalling arrangement |
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