CN211123112U

CN211123112U - Fault detection system of overhead contact system on railway

Info

Publication number: CN211123112U
Application number: CN201921866657.0U
Authority: CN
Inventors: 张国清; 杨雷; 漆一帆; 高朝晖
Original assignee: Wuhan Sunshine Power Science & Technology Co ltd
Current assignee: Wuhan Sunshine Power Science & Technology Co ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-07-28
Anticipated expiration: 2029-10-31

Abstract

The utility model discloses a fault detection system of contact net on railway, including the closed current loop that forms between rail, contact net and the train, fault detection system still includes: the detection terminals are arranged on the rail and provided with position identification information, and the detection terminals are used for detecting whether the current on the rail in the current loop changes or not and recording the time when the current on the rail changes; and the fault judging device is used for receiving the time of the change of the current recorded by all the detection terminals, judging that the contact network has a fault if a plurality of detected currents have the same time of the change, and determining the position of the contact network with the fault according to the position identification information corresponding to the detection terminal with the changed current, otherwise, judging that the contact network has no fault. The utility model discloses the method of detecting contact net line fault position is accurate and simple safety.

Description

Fault detection system of overhead contact system on railway

Technical Field

The utility model relates to a railway electrical fault judges technical field, concretely relates to fault detection system of contact net on railway.

Background

The railway junction is a hub for connecting the trunk lines and the branch lines of the railway, a power supply system in the railway junction area needs to ensure the normal operation and power supply of locomotives of the trunk lines and the branch lines of the railway at the same time, and a contact network in the railway junction area usually has a multi-branch form and a complex grid structure. When a line in a railway junction area has a fault, the existing fault detection means cannot well provide fault detection guidance, and for example, a contact network worker needs to patrol each power supply branch one by one on the premise that the position of the fault cannot be determined.

In the prior art, an in-station fault distance measuring device is used for determining the distance from a fault to traction according to impedance, the error of a detection result is relatively large due to the interference of branch line impedance, and meanwhile, a plurality of possible fault points are generated only when the distance from the fault to the traction is short, so that the guiding significance for actual fault inspection is not great under the condition that the branch line is at which the fault point is located.

In order to further determine the fault position, a part of fault detection devices adopt a theory similar to a distribution line fault indicator, namely a short-circuit current triggering principle, when a contact network line has a fault, a short-circuit current flows through an electric channel from a fault point to a traction substation, and the fault position and a branch line where the fault is located can be well judged by detecting the short-circuit current. However, the fault indicator adopting the short-circuit current triggering principle cannot distinguish the running current passed by the normal locomotive from the short-circuit current of the fault, so that the malfunction is frequent, the actual application effect is not ideal, and in the actual engineering application, the installation of equipment on the contact network in the driving area is not allowed, which also causes that the scheme similar to the fault indicator cannot be promoted in the actual engineering implementation.

SUMMERY OF THE UTILITY MODEL

To the defect that exists among the prior art, the utility model aims to provide a fault detection system of contact net on railway, its mode that detects contact net line fault position is accurate and simple safety.

In order to achieve the above object, an embodiment of the utility model provides a fault detection system of contact net on railway, including the closed current loop that forms between rail, contact net and the train, fault detection system still includes:

the detection terminals are arranged on the rails, and all the detection terminals are provided with position identification information and used for detecting whether the current on the rails in the current loop changes or not and recording the time when the current on the rails changes when the current on the rails is detected to change;

and the fault judgment device is used for receiving the time of the change of the current recorded by all the detection terminals, judging that the contact network has a fault if a plurality of detected currents have the same time of change, and determining the position of the contact network with the fault according to the position identification information corresponding to the detection terminal with the changed current, otherwise, judging that the contact network has no fault.

On the basis of the technical scheme, the rails comprise a main line rail and a plurality of branch line rails, and a plurality of detection terminals are uniformly distributed on the main line rail and the branch line rails.

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

On the basis of the technical scheme, 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 the fault current on the rail.

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

the sensor is arranged on a rail bolt of the rail and is used for collecting current on the rail in the current loop;

and the processor is connected with the sensor and is used for processing all the current collected by the sensor and acquiring the time when the current changes.

Compared with the prior art, the utility model has the advantages of:

the utility model provides a fault detection system of contact net on railway, its monitoring point is established on the rail, test terminal can gather the electric current and change and the time that changes, the relation between the time that changes takes place according to the electric current that a plurality of test terminal correspond, whether change takes place simultaneously promptly, confirm whether the contact net circuit breaks down, and simultaneously, can also confirm load current or fault current according to the law between the time, and confirm the position of breaking down according to test terminal's position sign, its detection mode is accurate and simple safety.

Drawings

Fig. 1 is a schematic view of a current loop of a train operating on a rail according to an embodiment of the present invention;

fig. 2 is a schematic view of a current loop in an embodiment of the present invention, in which a fault occurs between the detection point B1 and the detection point B2 on the branch rail B;

fig. 3 is a schematic diagram of a current loop in an embodiment of the present invention, in which a fault occurs between the detection point C1 and the detection point C2 on the branch rail C.

Detailed Description

The present invention will be described in further detail below with reference to specific embodiments and with reference to the accompanying drawings.

Examples

Referring to fig. 1, the embodiment of the utility model provides a fault detection system of contact net on railway, including the closed current loop that forms between rail, contact net and the train, fault detection system still includes:

When a train runs on a rail, a closed current loop can be formed between the train and the rail and between the train and a contact network, wherein a traction cable is a power supply, and a detection terminal on the rail is sequentially connected into the current loop, so that the detection terminal can gradually acquire increased current along with the gradual approach of the train, and a plurality of detection terminals in the current loop are sequentially arranged to sequentially change the time for acquiring the increased current; when the train runs to a fault position of the contact network line, a plurality of detection terminals on a fault loop simultaneously acquire increased current, and the law of the time when the current detected by the detection terminals changes is recorded, so that the fault of the contact network line can be determined, and the load current and the fault current of the train in the running process can be effectively distinguished; meanwhile, each detection terminal is provided with position identification information, when a fault occurs, the position of the detection terminal is determined through the recorded time, the position where the fault occurs can be judged, and the detection mode determines that the fault point is accurate, simple, safe and reliable.

And the detection terminal is arranged on the rail, and detection equipment does not need to be suspended on a contact network, so that the construction is simple and convenient, and the detection device is safer and more reliable.

Furthermore, the rails comprise a main line rail and a plurality of branch line rails, and a plurality of detection terminals are uniformly distributed on the main line rail and the branch line rails. In the embodiment, each main line rail and each branch line rail are provided with a detection terminal, so that the time recorded by the detection terminal can be used, the relation among the time recorded by all the detection terminals can be calculated, and the branch line and the section with the fault can be accurately judged.

Specifically, the location identification information includes: the number of the detection terminal and the position of the detection terminal. The position of the detection terminal can be information such as branches and sections.

In this embodiment, the fault short circuit and the running current of the train, that is, the fault current and the load current, can also be effectively distinguished, 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 the fault current on the rail; the fault judging device judges whether the recorded time for changing the current is the same or not, if so, the detection terminal detects that the current on the rail is the fault current, and the time for changing the current is the initial time of the fault current; otherwise, the detection terminal detects that the current on the rail is the load current, and the time when the current changes is the initial time of the load current.

As shown in fig. 2, this is the case when the fault occurs between detection point B1 and detection point B2 on the spur rail B. When a train runs from a main track A to a branch track B, detection points A1, A2, A3 and B1 are sequentially connected into a current loop, the time of change of current detected by corresponding detection terminals of the detection points A1, A2, A3 and B1 is sequentially changed, when the train is about to reach a detection point B2, a short-circuit grounding fault occurs to a catenary, the current loop of the catenary becomes a fault loop, the detection terminals at the detection points A1, A2, A3 and B1 simultaneously detect the change of current, and a section between a detection point B1 and a detection point B2 which is about to reach the fault on the branch track B is determined.

As shown in fig. 3, this is the case when a fault occurs on the feeder rail C between detection point C1 and detection point C2. When a train runs from a main track A to a branch track C, detection points A1, A2, A3 and C1 are sequentially connected into a current loop, the time of change of current detected by corresponding detection terminals of the detection points A1, A2, A3 and C1 is sequentially changed, when the train is about to reach the detection point C2, a short-circuit grounding fault occurs to a catenary, the current loop of the catenary becomes a fault loop, the detection terminals at the detection points A1, A2, A3 and C1 simultaneously detect the change of current, and a section between the detection point C1 and the detection point C2 which is about to reach the fault on the branch track C is determined.

In conclusion, when the railway junction on the railway is complicated, the branches do not interfere with each other, the position of the fault can be accurately judged through the recorded time, such as a section or a branch line, and operation and maintenance personnel can conveniently patrol the fault line.

Specifically, the detection terminal comprises a sensor and a processor; the sensor is arranged on a rail bolt of the rail and is used for collecting current on the rail in the current loop; the processor is connected with the sensor and used for processing all the currents collected by the sensor and acquiring the time when the currents change. The detection mode is simple and feasible.

The following is based on the embodiment of the utility model provides a fault detection method of fault detection system of contact net on railway further explains, fault detection method is used for detecting the closed current loop that forms between rail, contact net and the train, fault detection method includes following step:

laying a plurality of detection terminals on the rail in advance, wherein position identification information is prestored in all the detection terminals;

the detection terminal detects whether the current on the rail in the current loop changes or not, and records the time when the current on the rail changes;

and receiving the time of the change of the current recorded by all the detection terminals by using a fault judgment device, judging whether a plurality of detected currents have the same time of the change, if so, judging that the contact network has a fault, and determining the position of the contact network with the fault according to the position identification information corresponding to the detection terminal with the changed current, otherwise, judging that the contact network does not have the fault.

The present invention is not limited to the above embodiments, and for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered to be within the protection scope of the present invention. Those not described in detail in this specification are within the skill of the art.

Claims

1. The utility model provides a fault detection system of contact net on railway, includes the closed current loop that forms between rail, contact net and the train, its characterized in that, fault detection system still includes:

2. The system of claim 1, wherein the rails include a main rail and a plurality of branch rails, and the main rail and the branch rails are provided with a plurality of test terminals.

3. The system for detecting a fault in a contact line on a railway of claim 1 or 2, wherein the location identification information includes: the number of the detection terminal and the position of the detection terminal.

4. The system of claim 1, wherein the time when the current detected by the detection terminal changes is an initial time when the detection terminal detects the load current and/or the fault current on the rail.

5. The system for detecting the fault of the overhead contact line on the railway according to claim 1 or 4, wherein the detection terminal comprises: