A method for determining the fault location of a track circuit system

Abstract

The present invention discloses a method for judging the fault location of a track circuit system, which includes the following steps: The track circuit signal is sent by a sending device, transmitted layer by layer through all device nodes, and finally received by a receiving device; Measure each device node to obtain the input voltage and output voltage of each device node; Compare the input voltage and output voltage of each above-mentioned device node with the historical data measured during the most recent normal operation period of the track circuit system; If the input voltage value or output voltage value of a certain device node exceeds the corresponding specified threshold, it indicates that there is a fault in the device or line connected to the device node. The present invention can quickly determine the fault area only based on the voltage of indoor devices. By measuring the voltage of device nodes and calculating, the signal transmission relationship between devices is established, which facilitates technicians to more specifically locate the fault point, avoids blind measurement indoors and outdoors, saves the labor cost of troubleshooting, and improves the troubleshooting efficiency.

Description

Technical Field

[0001] The present invention relates to a railway system equipment detection technology, specifically a method for judging the fault location of a track circuit system. Background Art

[0002] Due to the long extension of the ZPW-2000 series track circuit system (hereinafter referred to as the track circuit system) (that is, it extends from the mechanical room to the outdoor rail side, outdoor equipment is laid along the rail, and the farthest one-way laying can reach 15 kilometers, and then it is connected back to the mechanical room through signal cables, and the farthest section can lay equipment and cables of 30 kilometers), and the equipment is distributed both indoors and outdoors. The huge system structure is affected by complex engineering environments (such as ballast, wall beams, etc.), artificial environments (such as problems caused by mistakes in on-site manual operations), natural environments (such as lightning, rain) and electromagnetic environments (such as there is a 25 kV catenary on the outdoor rail to supply power to trains, and there are many other electrical equipment in the room besides the track circuit, which causes electromagnetic interference), and various faults often occur suddenly. Compared with the numerous fault causes resulting from the combination of complex signal equipment, signal cables, and line nodes, the currently equipped track circuit monitoring system in the station can only provide a very small number of fault alarms and can only serve as a simple auxiliary function. Behind each fault phenomenon, there is hidden one or more fault causes. Therefore, the technical difficulty of troubleshooting the on-site faults of the track circuit system is very high. Due to the limitations of the railway operation environment, the faults of the track circuit must be resolved within a short skylight period from occurrence, otherwise more profound economic, people's livelihood, and even safety changes will occur.

[0003] For the on-site troubleshooting of existing track circuit systems, it is usually carried out by the method of replacing equipment after being prompted by the centralized monitoring system. If the fault still does not disappear after replacing the equipment, the superior maintenance personnel will be notified for emergency repair. It is very difficult for on-site staff to troubleshoot the fault targeted in the first place and it is very difficult to eliminate the fault during the skylight period without the help of superior maintenance personnel. Therefore, the technical difficulty of fault elimination is high and the troubleshooting time is long. Summary of the Invention

[0004] Aiming at the deficiencies in the on-site troubleshooting of the track circuit system in the prior art, such as high difficulty and long troubleshooting time, the technical problem to be solved by the present invention is to provide a method for judging the fault location of the track circuit system, which can quickly locate the fault location of the track circuit system by measuring the input or output voltage of the ZPW-2000 track circuit equipment nodes in the mechanical room, so as to improve the work efficiency of troubleshooting the sudden faults of the track circuit system on site and reduce the technical difficulty.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is:

[0006] The present invention provides a method for determining the fault location of a track circuit system. The mechanical room part of the track circuit system has multiple device nodes including a transmitting device, a sending-end relay combination rack, a sending-end analog network panel, a receiving-end analog network panel, a receiving-end relay combination rack, an attenuation device, and a receiving device, and includes the following steps:

[0007] 1) The track circuit signal is sent out by the transmitting device, transmitted layer by layer through all device nodes, and finally received by the receiving device;

[0008] 2) Measure each device node to obtain the input voltage and output voltage of each device node;

[0009] 3) Compare the input voltage and output voltage of each of the above device nodes with the historical data measured during the most recent normal operation period of the track circuit system;

[0010] 4) If the input voltage value or output voltage value of a certain device node exceeds the corresponding specified threshold, it indicates that there is a fault in the device or line connected to the device node.

[0011] The present invention further includes the following steps:

[0012] 5) For each device node, calculate the ratio of the input voltage to the output voltage;

[0013] 6) Compare the measured ratios of the input voltage and output voltage of each device node with the historical ratios measured during the most recent normal operation period of the track circuit system, and determine that the difference between the current measured ratios and the historical ratios measured during the most recent normal operation period of the track circuit system is within the allowable range;

[0014] 7) If the measured ratio and the historical ratio exceed the allowable range, it indicates that the fault occurs in the device or line between the numerator node and the denominator node of the measured ratio;

[0015] 8) If both the situations in step 4) and step 7) exist, it indicates that a fault occurs upstream near the transmitting device end, and the fault point downstream is found through the change inflection point of the voltage ratio away from the transmitting device end downstream.

[0016] If neither the input voltage value nor the output voltage value of a certain device node in step 4) exceeds the threshold, the track circuit system operates normally.

[0017] The transmitting device is the starting point of the transmission of the track circuit signal, and only outputs a power output signal. It has a self-checking function, and when a fault occurs, it is detected through the alarm of the centralized monitoring system.

[0018] The receiving device is the end point of the transmission of the track circuit signal, and only inputs a track output signal. It has a self-checking function, and when a fault occurs, it is detected through the alarm of the centralized monitoring system.

[0019] The rail output signal includes a main rail output signal and a small rail output signal. When troubleshooting faults in this section, it is necessary to measure the main rail output voltage value; when troubleshooting faults in the adjacent section, it is necessary to measure the small rail output voltage value.

[0020] The present invention has the following beneficial effects and advantages:

[0021] 1. The method provided by the present invention can quickly determine the area where the fault occurs only based on the voltage of indoor equipment. By measuring the voltage of equipment nodes and calculating, the signal transmission relationship between various equipment is established, which is convenient for technicians to more specifically locate the fault point, avoid blind measurement indoors and outdoors, and save the manpower troubleshooting cost.

[0022] 2. The method of the present invention is simple and practical. Good results have been obtained through trial operation. Since the fault location can be found directly by comparing the measured values, it is not necessary for the troubleshooting personnel to understand the overall structure and circuit layout of the equipment, reducing the technical difficulty of the troubleshooting work, saving the fault troubleshooting time, and improving the troubleshooting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of equipment nodes in the mechanical room of the track circuit system of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present invention will be further described below in conjunction with the drawings of the specification.

[0025] The present invention provides a method for judging the fault location of a track circuit system. The mechanical room part of the track circuit system has multiple equipment nodes including a sending device, a sending end relay combination rack, a sending end analog network disk, a receiving end analog network disk, a receiving end relay combination rack, an attenuation device, and a receiving device, and includes the following steps:

[0026] 1) The track circuit signal is sent out by the sending device, transmitted layer by layer through all equipment nodes, and finally received by the receiving device;

[0027] 2) Measure each equipment node to obtain the input voltage and output voltage of each equipment node;

[0028] 3) Compare the input voltage and output voltage of each above-mentioned equipment node with the historical data measured during the normal operation period of the track circuit system last time;

[0029] 4) If the input voltage value or output voltage value of a certain equipment node exceeds the corresponding specified threshold, it means that there is a fault in the equipment or circuit connected to the equipment node;

[0030] 5) For each equipment node, calculate the ratio of the input voltage to the output voltage;

[0031] 6) Compare the measured ratio of the input voltage and output voltage of each device node with the historical ratio measured during the most recent normal operation period of the track circuit system, and determine that the difference between the current measured ratio and the historical ratio measured during the most recent normal operation period of the track circuit system is within the allowable range;

[0032] 7) If the measured ratio exceeds the allowable range compared with the historical ratio, it indicates that the fault occurs in the device or line between the numerator node and the denominator node of this measured ratio;

[0033] 8) If both the situations in step 4) and step 7) exist simultaneously, it indicates that a fault occurs upstream near the sending device end, and the fault point downstream is found through the inflection point of the voltage ratio change far from the sending device end downstream.

[0034] If neither the input voltage value nor the output voltage value of a certain device node in step 4) exceeds the threshold value, the track circuit system operates normally.

[0035] The present invention provides a method for judging the fault location of a track circuit system. In this embodiment, a method for quickly locating the fault location by measuring the input or output voltage of the ZPW-2000 track circuit device nodes in the mechanical room is described.

[0036] As shown in the figure, the ZPW-2000 track circuit signal sequentially passes through 7 device nodes including a sending device, a sending-end relay combination rack, a sending-end analog network disk, a receiving-end analog network disk, a receiving-end relay combination rack, an attenuation device, and a receiving device in the mechanical room. There are a total of 11 measurement nodes in the mechanical room, including the output voltage (the signal sent by the sending device is "output", and the output voltage is called the "output voltage"), the input voltage of the sending-end combination rack, the output voltage of the sending-end combination rack, the voltage on the sending device side, the voltage on the sending cable side, the voltage on the receiving cable side, the voltage on the receiving device side, the input voltage of the receiving-end combination rack, the output voltage of the receiving-end combination rack, the rail input voltage, and the rail output voltage. When the track circuit system operates normally, the sending-end relay combination rack, the sending-end analog network disk, the receiving-end analog network disk, the receiving-end relay combination rack, the attenuation device, and the receiving device all have effective input and output voltages, and the ratio of the input voltage to the output voltage basically maintains within a stable threshold range. When an indoor fault occurs in the track circuit system, the input or output voltage of each device node will also change accordingly and exceed the threshold range.

[0037] When the sending device is normal, it emits the output voltage U1, and when the sending device is abnormal, it emits the output voltage U1`;

[0038] Normally, the input side of the sending-end relay combination rack is the input voltage U2 of the sending-end combination rack, and the output side is the output voltage U3 of the sending-end combination rack. When abnormal, the corresponding input voltage is U2`, and the output voltage is U3`.

[0039] The input side of the sending-end analog network disk is the voltage U4 on the sending-end device side, and the output side is the voltage U5 on the sending-end cable side. In case of abnormality, the corresponding input voltage is U4`, and the output voltage is U5`.

[0040] The input side of the receiving-end analog network disk is the voltage U6 on the receiving-end cable side, and the output side is the voltage U7 on the receiving-end device side. In case of abnormality, the corresponding input voltage is U6`, and the output voltage is U7`.

[0041] The input side of the receiving-end relay combination rack is the input voltage U8 of the receiving-end combination rack, and the output side is the output voltage U9 of the receiving-end combination rack. In case of abnormality, the corresponding input voltage is U8`, and the output voltage is U9`.

[0042] The input side of the attenuation device is the rail input voltage U10, and in case of abnormality, the input voltage is U10`.

[0043] When the receiving device is normal, the rail output voltage U11 can be measured on the attenuation device. When the receiving device is abnormal, the rail output voltage is U11`.

[0044] The ratios of the input voltage to the output voltage of each of the above device nodes are U1 / U2, U1` / U2`, U2 / U3, U2` / U3`, U3 / U4, U3` / U4`, U4 / U5, U4` / U5`, U5 / U6, U5` / U6`, U6 / U7, U6` / U7`, U7 / U8, U7` / U8`, U8 / U9, U8` / U9`, U9 / U10, U9` / U10`, U10 / U11, U10` / U11`.

[0045] The method provided by the present invention will be described in detail below according to a specific embodiment.

[0046] A certain station received an alarm from the track circuit centralized monitoring system, indicating that a "red rail" fault occurred in a certain section during a no-train period (when the receiver receives a low-level signal, the railway monitoring system shows that this section turns red, commonly known as "red rail"; similarly, if "red rail" appears when there is no train on the rail, it means that the signal sent by the sending device disappears at the intermediate fault point, and the receiving device is at a low level, resulting in "red rail"). The monitoring system showed that the rail voltage U11` in this section was significantly lower than the lower threshold value. Subsequently, the technical personnel measured the voltages of other measurement nodes indoors and compared them with the historical data measured during the normal operation period of the track circuit system at the nearest time, and obtained U1≈U1`, U2≈U2`, U3>U3`, U4>U4`, U5>U5`, U6>U6`, U7>U7`, U8>U8`, U9>U9`, U10>U10`, U11>U11` and U2 / U3<<U2` / U3`, U3 / U4≈U3` / U4`, U4 / U5≈U4` / U5`, U5 / U6≈U5` / U6`, U6 / U7≈U6` / U7`, U7 / U8≈U7` / U8`, U8 / U9≈U8` / U9`, U9 / U10≈U9` / U10`, U10 / U11≈U10` / U11`. Through measurement and comparison, it was found that starting from the output voltage U3` of the sending end relay combination rack, the voltages of the subsequent measurement nodes all showed a downward trend, and the ratio of the input voltage U2` to the output voltage U3` of the sending end relay combination rack was significantly greater than the ratio of the input voltage U2 to the output voltage U3 measured during normal times, while the input-output ratios of other sections were almost equal. From this, it was judged that the fault occurred in the sending end relay combination rack. Subsequently, the technical personnel checked the direction switching relay (used to switch the signal transmission direction) on the combination rack of this section and found that the wiring of the direction switching relay had a loose connection, resulting in an increase in the resistance of the transmission line, causing the amplitudes of the track circuit signal voltages after this equipment node to all decrease and the ratio of the input voltage to the output voltage of other equipment nodes except the fault point to change little.

[0047] When U1≈U1`, U2≈U2`, U3≈U3`, U4≈U4`, U5≈U5`, U6≠U6`, U7≠U7`, U8≠U8`, U9≠U9`, U10≠U10`, U11≠U11`, it can be judged that the fault point is located outside the mechanical room. And so on.

[0048] The "≈" (approximately equal to) in this invention is defined as: the value after the "≈" sign does not exceed 10% of the value before the "≈" sign. If it exceeds 10%, it is considered "≠" (not equal to).

[0049] During vehicle operation, the output voltage U1 is adjusted according to the on-site situation. Each station has its own threshold range, so the output voltage U1 of the device can have multiple levels. The output voltage U1 is distinguished according to different level grades, such as the first level to the tenth level, and its voltage threshold range is: the first level, 161 - 170V; the second level, 146 - 154V; the third level, 126 - 137V; the fourth level, 103 - 112V; the fifth level, 73 - 80V; the sixth level, 60 - 67V; the seventh level, 54 - 60V; the eighth level, 44 - 48V; the ninth level, 37 - 41V; the tenth level, 31 - 33V. If the set output for a certain section is the first level (161 - 170V), and the measured output voltage U1` is 20V, exceeding 10% of the threshold range, it indicates that the sending device is abnormal.

[0050] Example of the voltage ratio of the head-end device:

[0051] As Figure 1 shown, according to the on-site situation, a certain station normally adjusts the signal of the sending device to the first level, that is, the output voltage value range is within 161 - 170V. When the sending device fails, the output voltage may exceed the threshold range. For example, when it drops to a few mV, it indicates that the sending device is abnormal. When the output voltage rises beyond the threshold range, it indicates that there may be an open circuit in the downstream device. When the output voltage U1 / U2 >> U1` / U2` and the subsequent voltage ratios are normal, it can be judged that the connection cable between the output voltage and the sending terminal combination rack is open.

[0052] Example of the voltage and voltage ratio of the middle-end device:

[0053] As Figure 1 shown, when U9 << U9` and U8 / U9 >> U8` / U9`, and the voltage value ratios of other device nodes are approximately equal, it indicates that there is an abnormality on the receiving terminal relay combination rack between U8 and U9.

[0054] Example of the voltage of the end device:

[0055] As Figure 1 shown, a certain station adjusts the main rail output range of U11 in a certain section to be 244 - 671mV according to the "Track Circuit Adjustment Table". When the main rail output voltage value is lower than the lower threshold and the voltage at U10 is normal, it indicates that there is a fault in the attenuation device.

[0056] In this embodiment, the sending device is the starting point of the transmission of the track circuit signal. It only outputs the output signal and has a self-check function. When a fault occurs, it is detected through the centralized monitoring system alarm; the receiving device is the end point of the transmission of the track circuit signal. It only inputs the track output signal and also has a self-check function. When a fault occurs, it is detected through the centralized monitoring system alarm.

[0057] The track output signal includes the main track output signal and the small track output signal. When troubleshooting faults in this section, it is necessary to measure the main track output voltage value; when troubleshooting faults in the adjacent section, it is necessary to measure the small track output voltage value.

[0058] The present invention provides a faster method for troubleshooting mechanical room equipment node faults in the ZPW-2000 series track circuit system. By simply measuring the input voltage and output voltage of each equipment node and comparing them with historical data, the location of the fault point in the mechanical room can be quickly located, improving the efficiency of fault troubleshooting and reducing the technical difficulty of fault troubleshooting work.

Claims

1. A method for determining the fault location of a track circuit system, wherein the mechanical interior of the track circuit system comprises a plurality of device nodes including a sending device, a sending-end relay assembly rack, a sending-end simulated network disk, a receiving-end simulated network disk, a receiving-end relay assembly rack, a loss device, and a receiving device, characterized in that The following steps are involved: 1) Track circuit signals are sent by the sending device, transmitted through all device nodes, and finally received by the receiving device; 2) Measure each device node to obtain the input voltage and output voltage of each device node; 3) Compare the input voltage and output voltage of each of the above-mentioned device nodes with the historical data measured during the most recent normal operation of the track circuit system; 4) If the input voltage or output voltage of a device node exceeds the corresponding specified threshold, it indicates that the device or line connected to the device node is faulty; 5) For each device node, calculate the ratio of input voltage to output voltage; 6) Compare the measured ratios of the input voltage and output voltage of each device node with the historical ratios measured during the most recent normal operation of the track circuit system, and determine whether the differences between the current measured ratios and the historical ratios measured during the most recent normal operation of the track circuit system are within the allowable range; 7) If the measured ratio and the historical ratio exceed the allowable range, it means that the fault occurs in the device or line between the numerator node and the denominator node of the measured ratio.

2. The method for determining the fault location of a track circuit system according to claim 1, characterized in that The following steps are also included: 8) If the conditions in step 4) and step 7) exist simultaneously, it indicates that a fault has occurred upstream close to the transmitting device, and the downstream fault point can be found downstream away from the transmitting device through the inflection point of the voltage ratio change.

3. The method for determining the fault location of a track circuit system according to claim 1, characterized in that: If the input voltage value and the output voltage value of a device node in step 4) do not exceed the threshold value, the track circuit system operates normally.

4. The method for determining the fault location of a track circuit system according to claim 1, wherein: The sending device is the transmission starting point of the track circuit signal and only outputs the power output signal. It has a self-checking function and can be detected through an alarm of the centralized monitoring system when a fault occurs.

5. The method for determining the fault location of a track circuit system according to claim 1, wherein: The receiving device is the transmission end point of the track circuit signal. It only inputs the track output signal. It has a self-checking function and will alarm through the centralized monitoring system when a fault occurs.

6. The method for determining the fault location of a track circuit system according to claim 5, characterized in that: The rail output signal includes the main rail output signal and the small rail output signal. When troubleshooting the current section, the main rail output voltage value needs to be measured; when troubleshooting the adjacent section, the small rail output voltage value needs to be measured.

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