Railway contact network fault detection system and method

Abstract

The present invention discloses a fault detection system for a contact network on a railway, comprising a closed current loop formed between a rail, a contact network and a train, and the fault detection system further comprises: a plurality of detection terminals arranged on the rail, and all detection terminals have position identification information, the detection terminals are used to detect whether the current on the rail in the current loop changes, and when the current on the rail is detected to change, the time when the current change is detected is recorded; a fault judgment device is used to receive the time when the current changes recorded by all detection terminals, if there are multiple detected current changes at the same time, it is judged that the contact network has a fault, and the position of the contact network fault is determined according to the position identification information corresponding to the detection terminal where the current changes, otherwise, it is judged that the contact network has no fault. The method for detecting the fault position of the contact network line of the present invention is accurate, simple and safe.

Description

Technical Field

[0001] The invention relates to the technical field of railway electrical fault judgment, and in particular to a fault detection system and method for a contact network on a railway. Background Art

[0002] Railway hubs are the hubs that connect the main and branch lines of railways. The power supply system in railway hubs needs to ensure the normal operation and power supply of locomotives on both main and branch lines. The overhead contact network in railway hubs often presents a multi-branch form and a complex grid structure. When a line in a railway hub fails, the current fault detection methods cannot provide good fault detection guidance. Under the premise of being unable to determine the location of the fault, for example, the overhead contact network workers need to inspect each power supply branch line one by one.

[0003] In the prior art, a fault distance measuring device within the station is used to determine the distance of the fault from the traction station based on impedance. Due to the interference of the branch line impedance, the error of the detection result is relatively large. At the same time, only the distance from the fault to the traction station will produce multiple possible fault points. When it is impossible to determine which branch line the fault point is on, it has little guiding significance for actual fault inspection.

[0004] In order to further determine the fault location, some fault detection devices currently use a theory similar to that of distribution line fault indicators, that is, they use the short-circuit current triggering principle. When a fault occurs in the overhead line, a short-circuit current will flow through the electrical channel from the fault point to the traction substation. By detecting the short-circuit current, the location of the fault point and the branch line where the fault is located can be well determined. However, fault indicators that use the short-circuit current triggering principle often cannot distinguish between the operating current of a normal locomotive and the short-circuit current of a fault, so they frequently malfunction and the actual application effect is not ideal. In addition, in actual engineering applications, it is often not allowed to install equipment on the overhead line within the driving range, which also makes it impossible to advance similar fault indicator solutions in actual engineering implementation. Summary of the invention

[0005] In view of the defects existing in the prior art, the purpose of the present invention is to provide a fault detection system and method for a contact network on a railway, which is accurate, simple and safe in detecting the fault location of the contact network line.

[0006] To achieve the above objectives, in a first aspect, an embodiment of the present invention provides a fault detection system for a contact network on a railway, including a closed current loop formed between a rail, a contact network and a train, and the fault detection system further includes:

[0007] A plurality of detection terminals are arranged on the rails, and all the detection terminals have location identification information, and the detection terminals are used to detect whether the current on the rails in the current loop changes, and when the current on the rails changes, record the time when the current change is detected;

[0008] A fault judgment device is used to receive the time when the current changes recorded by all the detection terminals. If there are multiple detected current change times that are the same, it is judged that the contact network has a fault, and the location of the contact network fault is determined based on the position identification information corresponding to the detection terminal where the current changes. Otherwise, it is judged that the contact network has not a fault.

[0009] On the basis of the above technical solution, the rails include a main line rail and a plurality of branch line rails, and a plurality of detection terminals are arranged on the main line rail and the plurality of branch line rails.

[0010] On the basis of the above technical solution, the location identification information includes: the number of the detection terminal and the location of the detection terminal.

[0011] On the basis of the above technical solution, the time when the current detected by the detection terminal changes is the initial time when the detection terminal detects the load current and / or fault current on the rail.

[0012] On the basis of the above technical solution, the detection terminal includes:

[0013] A sensor, which is mounted on a rail bolt of the rail and is used to collect the current on the rail in the current loop;

[0014] A processor is connected to the sensor and is used to process all currents collected by the sensor and obtain the time when the current changes.

[0015] In a second aspect, an embodiment of the present invention further provides a method for detecting a fault of a contact network on a railway, which is used to detect a closed current loop formed between a rail, a contact network and a train, and the fault detection method comprises the following steps:

[0016] A plurality of detection terminals are pre-arranged on the rails, and all the detection terminals are pre-stored with location identification information;

[0017] The detection terminal detects whether the current on the rail in the current loop changes, and when detecting that the current on the rail changes, records the time when the current change is detected;

[0018] A fault judgment device is used to receive the time when the current changes recorded by all the detection terminals, and to judge whether there are multiple current changes detected with the same time. If so, it is judged that the contact network has a fault, and the location of the contact network fault is determined based on the position identification information corresponding to the detection terminal where the current changes. Otherwise, it is judged that the contact network has not a fault.

[0019] On the basis of the above technical solution, the rails include a main line rail and a plurality of branch line rails, and a plurality of detection terminals are arranged on the main line rail and the plurality of branch line rails.

[0020] On the basis of the above technical solution, the location identification information includes: the number of the detection terminal and the location of the detection terminal.

[0021] On the basis of the above technical solution, the time when the current detected by the detection terminal changes is the initial time when the detection terminal detects the load current and / or fault current on the rail.

[0022] On the basis of the above technical solution, the detection terminal includes:

[0023] A sensor, which is mounted on a rail bolt of the rail and is used to collect the current on the rail in the current loop;

[0024] A processor is connected to the sensor and is used to process all currents collected by the sensor and obtain the time when the current changes.

[0025] Compared with the prior art, the advantages of the present invention are:

[0026] The present invention provides a fault detection system for a contact network on a railway, wherein a monitoring point is arranged on a rail, and a detection terminal can collect current changes and the time when the changes occur. According to the relationship between the times when the currents corresponding to a plurality of detection terminals change, that is, whether the changes occur simultaneously, it is determined whether a fault occurs in the contact network line. At the same time, the load current or the fault current can be determined according to the regularity between the times, and the location of the fault can be determined according to the location identifier of the detection terminal. The detection method is accurate, simple and safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of a current loop when a train runs on a rail in an embodiment of the present invention;

[0028] Figure 2 Schematic diagram of a current loop when a fault occurs between detection point B1 and detection point B2 on branch line rail B in an embodiment of the present invention;

[0029] Figure 3Schematic diagram of a current loop when a fault occurs between detection point C1 and detection point C2 on the branch line rail C in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below through specific implementation examples in conjunction with the accompanying drawings.

[0031] Example

[0032] See also Figure 1 As shown, an embodiment of the present invention provides a fault detection system for a contact network on a railway, including a closed current loop formed between a rail, a contact network and a train, and the fault detection system further includes:

[0033] A plurality of detection terminals are arranged on the rails, and all the detection terminals have location identification information, and the detection terminals are used to detect whether the current on the rails in the current loop changes, and when the current on the rails changes, record the time when the current change is detected;

[0034] A fault judgment device is used to receive the time when the current changes recorded by all the detection terminals. If there are multiple detected current change times that are the same, it is judged that the contact network has a fault, and the location of the contact network fault is determined based on the position identification information corresponding to the detection terminal where the current changes. Otherwise, it is judged that the contact network has not a fault.

[0035] When a train runs on the rails, a closed current loop can be formed between the train, the rails and the contact network, wherein the traction rope is the power supply, and the detection terminals on the rails are connected to the current loop in sequence. Therefore, the detection terminals can gradually collect the increasing current as the train gradually approaches, and the time for multiple detection terminals arranged in sequence in the current loop to collect the increased current changes in sequence; when the train runs to the fault point of the contact network line, multiple detection terminals on the fault loop collect the increased current at the same time. By recording the regularity between the time when the current detected by the detection terminal changes, not only can it be determined that the contact network line has a fault, but also the load current and fault current of the train during its operation can be effectively distinguished; at the same time, each detection terminal has location identification information. When a fault occurs, the location of the fault can be determined by determining the location of the detection terminal through the recorded time. The detection method determines the fault point accurately and is simple, safe and reliable.

[0036] In addition, the detection terminal is arranged on the rail, and there is no need to hang the detection equipment on the contact network. The construction is simple and convenient, and it is safer and more reliable.

[0037] Furthermore, the rails include a main rail and several branch rails, and several detection terminals are arranged on the main rail and the branch rails. The railway network is complicated, especially the railway hub. When a fault occurs, it is difficult to determine which branch and which section has a fault. In this embodiment, each main rail and branch rail is equipped with a detection terminal, and the time recorded by the detection terminal can be used to calculate the relationship between the time recorded by all the detection terminals, so that the branch and section where the fault occurs can be accurately determined.

[0038] Specifically, the location identification information includes: the number of the detection terminal and the location of the detection terminal. The location of the detection terminal can be information such as a branch, a section, etc.

[0039] In this embodiment, it is also possible to effectively distinguish between a fault short-circuit circuit and the operating current of a train, that is, a fault current and a load current. Specifically, the time when the current detected by the detection terminal changes is the initial time when the detection terminal detects the load current and / or fault current on the rail; the fault judgment device determines whether the recorded time when the current changes is the same. If so, the detection terminal detects that the current on the rail is a fault current, and the time when the current changes is the initial time of the fault current; otherwise, the detection terminal detects that the current on the rail is a load current, and the time when the current changes is the initial time of the load current.

[0040] like Figure 2 As shown, it is the case when the fault occurs between detection point B1 and detection point B2 on branch rail B. When the train runs from the main rail A to the branch rail B, detection points A1, A2, A3, and B1 are connected to the current loop in sequence, and the time when the current changes detected by the corresponding detection terminals changes in sequence. When the train is about to reach detection point B2, a short-circuit grounding fault occurs in the overhead contact network, and its current loop becomes a fault loop. The detection terminals at detection points A1, A2, A3, and B1 simultaneously detect the current change, and determine that the fault occurs in the section between detection point B1 on branch rail B and detection point B2 that is about to be reached.

[0041] like Figure 3As shown, it is the case when the fault occurs between detection point C1 and detection point C2 on the branch rail C. When the train runs from the main rail A to the branch rail C, detection points A1, A2, A3, and C1 are connected to the current loop in sequence, and the time when the current changes detected by the corresponding detection terminals changes in sequence. When the train is about to reach detection point C2, a short-circuit grounding fault occurs in the overhead contact network, and its current loop becomes a fault loop. The detection terminals at detection points A1, A2, A3, and C1 simultaneously detect the current change, and determine that the fault occurs in the section between detection point C1 on the branch rail C and the detection point C2 that is about to be reached.

[0042] In summary, when the railway hubs on the railway are complex, multiple branches do not interfere with each other, and the location of the fault can be accurately determined by the recorded time, such as the section or branch line, which is convenient for operation and maintenance personnel to inspect the faulty line.

[0043] Specifically, the detection terminal includes a sensor and a processor; the sensor is installed on the rail bolt of the rail and is used to collect the current on the rail in the current loop; the processor is connected to the sensor and is used to process all the current collected by the sensor and obtain the time when the current changes. Its detection method is also simple and feasible.

[0044] The embodiment of the present invention further provides a method for detecting a fault of a contact network on a railway, which is used to detect a closed current loop formed between a rail, a contact network and a train. The fault detection method comprises the following steps:

[0045] A plurality of detection terminals are pre-arranged on the rails, and all the detection terminals are pre-stored with location identification information;

[0046] The detection terminal detects whether the current on the rail in the current loop changes, and when detecting that the current on the rail changes, records the time when the current change is detected;

[0047] A fault judgment device is used to receive the time when the current changes recorded by all the detection terminals, and to judge whether there are multiple current changes detected with the same time. If so, it is judged that the contact network has a fault, and the location of the contact network fault is determined based on the position identification information corresponding to the detection terminal where the current changes. Otherwise, it is judged that the contact network has not a fault.

[0048] Furthermore, the rails include a main rail and several branch rails, and several detection terminals are arranged on the main rail and the branch rails. The railway network is complicated, especially the railway hub. When a fault occurs, it is difficult to determine which branch and which section has a fault. In this embodiment, each main rail and branch rail is equipped with a detection terminal, and the time recorded by the detection terminal can be used to calculate the relationship between the time recorded by all the detection terminals, so that the branch and section where the fault occurs can be accurately determined.

[0049] Specifically, the location identification information includes: the number of the detection terminal and the location of the detection terminal. The location of the detection terminal can be information such as a branch, a section, etc.

[0050] In this embodiment, it is also possible to effectively distinguish between a fault short-circuit circuit and the operating current of a train, that is, a fault current and a load current. Specifically, the time when the current detected by the detection terminal changes is the initial time when the detection terminal detects the load current and / or fault current on the rail; the fault judgment device determines whether the recorded time when the current changes is the same. If so, the detection terminal detects that the current on the rail is a fault current, and the time when the current changes is the initial time of the fault current; otherwise, the detection terminal detects that the current on the rail is a load current, and the time when the current changes is the initial time of the load current.

[0051] In this embodiment, it is also possible to effectively distinguish between a fault short-circuit circuit and the operating current of a train, that is, a fault current and a load current. Specifically, the time when the current detected by the detection terminal changes is the initial time when the detection terminal detects the load current and / or fault current on the rail; the fault judgment device determines whether the recorded time when the current changes is the same. If so, the detection terminal detects that the current on the rail is a fault current, and the time when the current changes is the initial time of the fault current; otherwise, the detection terminal detects that the current on the rail is a load current, and the time when the current changes is the initial time of the load current.

[0052] Specifically, the detection terminal includes a sensor and a processor; the sensor is installed on the rail bolt of the rail, and is used to collect the current on the rail in the current loop; the processor is connected to the sensor, and is used to process all currents collected by the sensor and obtain the time when the current changes.

[0053] The present invention is not limited to the above-mentioned embodiments. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A fault detection system for a contact network on a railway, comprising a closed current loop formed between a rail, a contact network and a train, characterized in that: The fault detection system also includes: A plurality of detection terminals are arranged on the rails, and all the detection terminals have location identification information, and the detection terminals are used to detect whether the current on the rails in the current loop changes, and when the current on the rails changes, record the time when the current change is detected; A fault judgment device, which is used to receive the time when the current changes recorded by all the detection terminals, if there are multiple current changes detected at the same time, it is judged that the contact network has a fault, and the location of the contact network fault is determined according to the location identification information corresponding to the detection terminal where the current changes, otherwise, it is judged that the contact network has no fault; The rails include a main rail and a plurality of branch rails, and a plurality of detection terminals are arranged on the main rail and the plurality of branch rails; The time when the current detected by the detection terminal changes is the initial time when the detection terminal detects the load current and / or fault current on the rail.

2. The fault detection system for the contact network on the railway as claimed in claim 1, characterized in that: The location identification information includes: the number of the detection terminal and the location of the detection terminal.

3. The fault detection system for the contact network on the railway as claimed in claim 1, characterized in that: The detection terminal comprises: A sensor, which is mounted on a rail bolt of the rail and is used to collect the current on the rail in the current loop; A processor is connected to the sensor and is used to process all currents collected by the sensor and obtain the time when the current changes.

4. A method for detecting faults of a contact network on a railway, which is used to detect a closed current loop formed between a rail, a contact network and a train, characterized in that: The fault detection method comprises the following steps: A plurality of detection terminals are pre-arranged on the rails, and all the detection terminals are pre-stored with location identification information; The detection terminal detects whether the current on the rail in the current loop changes, and when detecting that the current on the rail changes, records the time when the current change is detected; A fault judgment device is used to receive the time when the current changes recorded by all the detection terminals, and to judge whether there are multiple current changes detected with the same time. If so, it is judged that the contact network has a fault, and the location of the contact network fault is determined based on the position identification information corresponding to the detection terminal where the current changes. Otherwise, it is judged that the contact network has not a fault.

5. The method for detecting faults of a contact network on a railway as claimed in claim 4, characterized in that: The rails include a main rail and a plurality of branch rails, and a plurality of detection terminals are arranged on the main rail and the plurality of branch rails.

6. The method for detecting faults of a contact network on a railway as claimed in claim 4 or 5, characterized in that: The location identification information includes: the number of the detection terminal and the location of the detection terminal.

7. The method for detecting faults of a contact network on a railway as claimed in claim 4, characterized in that: The time when the current detected by the detection terminal changes is the initial time when the detection terminal detects the load current and / or fault current on the rail.

8. The method for detecting faults of a contact network on a railway according to claim 4 or 7, characterized in that: The detection terminal comprises: A sensor, which is mounted on a rail bolt of the rail and is used to collect the current on the rail in the current loop; A processor is connected to the sensor and is used to process all currents collected by the sensor and obtain the time when the current changes.

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