CN212332436U - Steel rail backflow device and detection system for direct-current traction power supply system - Google Patents
Steel rail backflow device and detection system for direct-current traction power supply system Download PDFInfo
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- CN212332436U CN212332436U CN202021935400.9U CN202021935400U CN212332436U CN 212332436 U CN212332436 U CN 212332436U CN 202021935400 U CN202021935400 U CN 202021935400U CN 212332436 U CN212332436 U CN 212332436U
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Abstract
The utility model discloses a rail reflux unit and detecting system for direct current traction power supply system, including T type female row, first moving contact, the second moving contact, first shunt, the second shunt and rail insulation festival, rail insulation festival includes insulating piece and the rail fishplate of arranging in rail gap department, T type female row includes first port, the second port and third port, first port and second port are the static contact, first port and second port are connected with the movable end of first moving contact and the movable end of second moving contact respectively, first moving contact is through the one end of first shunt and cable junction rail insulation festival, the second moving contact is through the other end of second shunt and cable junction rail insulation festival, realize the connection or disconnection of T type female row and rail insulation festival through removing first moving contact and second moving contact, it is through the setting of each module and the relation of connection each other, the steel rail can be electrically segmented conveniently and quickly without changing the existing state of the full-line electrical through of the main line steel rail, and stray current is prevented to the maximum extent.
Description
Technical Field
The utility model belongs to the technical field of the track traffic, more specifically relates to a rail reflux unit and detecting system for direct current pulls power supply system.
Background
The urban rail transit direct current traction system selects a traveling rail and also serves as a return rail to form a locomotive traction return passage, and a steel rail serves as the locomotive traction return passage and is required to be installed in an insulating mode relative to the ground. Since the rail cannot be completely insulated from ground and there is a voltage drop in the return rail, a portion of the load current, i.e., stray current, leaks from the rail into the ties and track bed and underground metal facilities. The long-term action of the stray current not only causes a great deal of metal loss, but also can cause structural damage and other system damages, and once an accident happens, disastrous results are often caused due to the concealment and the burst of corrosion.
The insulation level of the steel rail to the ground is the most main factor directly influencing the generation of stray current, usually, the stray current cannot be directly measured, the steel rail insulation lacks a quick and effective detection means, the whole steel rail on the positive line of the rail transit is electrically communicated, and the weak insulation point at a certain point influences the insulation level of the whole line. The traditional method for carrying out insulation measurement on the steel rail wastes time and labor, and a large amount of measurement signals are required to be synchronously acquired to ensure the correctness of a measured area. The steel rail of traditional positive line is long rail, and the whole line of the line steel rail of dozens of kilometers is electric to be link up, and the insulating weak link of any point will directly destroy the insulation system of whole line, brings very serious stray current problem, and realizes the troubleshooting to the damaged region of insulation and be a work of wasting manpower, material resources, and a large amount of time, economic input only change the insulating detection of steel rail once, follow-up repeated detection will repeatedly drop into manpower and materials again.
SUMMERY OF THE UTILITY MODEL
At least one defect or improvement demand to prior art, the utility model provides a rail reflux unit and detecting system for direct current pulls power supply system, its setting through each module and relation of connection each other can be under the state that does not change current main line rail full line electricity and link up, convenient and fast carries out the electric segmentation to the rail, furthest prevents stray current's production.
In order to achieve the above object, according to one aspect of the present invention, there is provided a rail return device for a dc traction power supply system, the device comprising a T-shaped bus bar, a first movable contact, a second movable contact, a first shunt, a second shunt and a rail insulation section,
the steel rail insulation joint comprises an insulation sheet and a steel rail fishplate which are arranged at a steel rail gap;
the T-shaped busbar comprises a first port, a second port and a third port, the first port and the second port are both static contacts, the first port is connected with the moving end of the first moving contact, the second port is connected with the moving end of the second moving contact, and the third port is connected with a negative electrode cabinet of the direct-current traction power supply system through a cable;
the first moving contact is connected with one end of the steel rail insulating section through a first shunt and a cable, and the second moving contact is connected with the other end of the steel rail insulating section through a second shunt and a cable.
As the utility model discloses a further improvement, be connected through insulating trace between first moving contact and the second moving contact, the motor is connected to insulating trace.
As a further improvement of the utility model, the first moving contact is connected with the first motor, and the second moving contact is connected with the second motor.
As the utility model discloses a further improvement is connected through insulating trace between first moving contact and the second moving contact, and manual rocker is connected to insulating trace.
As a further improvement of the utility model, the T-shaped busbar is installed on the shell of the reflux device or the concrete side wall through the insulation of the supporting insulator.
As a further improvement, the backflow device further comprises a monitoring module, and the monitoring module comprises a monitoring camera and a signal transmission medium.
As a further improvement of the present invention, the reflow apparatus further includes an auxiliary switch, and the auxiliary switch includes a contact as a passive output node.
For realizing the above-mentioned purpose, according to the utility model discloses a another aspect provides a detecting system for above-mentioned rail reflux unit, detecting system includes DC power supply, high accuracy voltage acquisition module, micro-processing module and display module, DC power supply's both ends are connected first shunt respectively and are close to the one end of rail insulation festival and the one end that the second shunt is close to rail insulation festival, high accuracy voltage acquisition module connects the both ends of the fixed length rail in the rail insulation festival between first shunt and the second shunt respectively, high accuracy voltage acquisition module still connects the both ends of the outside fixed length rail of rail insulation festival between first shunt and the second shunt respectively.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, can gain following beneficial effect:
the utility model provides a pair of rail reflux unit and detecting system for direct current pulls power supply system, it is female arranging through the T type, first moving contact, the second moving contact, first shunt, the setting of modules such as second shunt and rail insulation festival and the relation of connection each other, can not change the state that current whole line of main line rail is electric to link up during track traffic operation, convenient and fast carries out the electric segmentation to the rail, furthest prevents stray current's production, can realize the electric segmentation of whole line rail fast when the power failure overhauls the investigation trouble. The method has important significance for rapidly checking the insulation fault of the steel rail, ensuring the insulation level of the steel rail and restraining the generation of stray current from the source. The characteristics of the system are fit for the traffic field that the running rail is used as a locomotive traction backflow path, the insulation of the steel rail is required and the stray protection is required, such as subways, light rails, trams and inter-city railways.
The utility model provides a pair of a rail reflux unit and detecting system for direct current pulls power supply system, at every two reflux unit that increase of pulling and can realize rail subregion, segmentation function, the normal traction of train is got and is flowed and the backward flow when not influencing the normal operation of main line, is fit for all and walks the direct current that the rail was done the return current rail concurrently and pulls power supply system, is fit for newly-built circuit and existing circuit transformation.
Drawings
Fig. 1 is a schematic structural diagram of a rail return apparatus for a dc traction power supply system according to an embodiment of the present invention;
fig. 2 is a second schematic structural diagram of a rail return apparatus for a dc traction power supply system according to an embodiment of the present invention;
fig. 3 is a third schematic structural diagram of a rail return device for a dc traction power supply system according to an embodiment of the present invention;
fig. 4 is a schematic view of a T-shaped busbar installation manner provided by the embodiment of the present invention;
fig. 5 is a schematic structural diagram of a detection system for the rail return apparatus according to an embodiment of the present invention;
in all the figures, the same reference numerals denote the same features, in particular:
the device comprises a 1-shunt, a 2-motor, a 3-T type busbar, a 4-static contact, a 5-insulating linkage rod, a 6-moving contact and a 7-camera.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
The working principle of the self-healing power supply method and system for urban rail transit provided by the invention is described in detail below with reference to the embodiments and the accompanying drawings.
A rail reflux unit for DC traction power supply system is composed of T-shaped busbar, the first and the second moving contacts, the first and the second current dividers, and the insulating joint of rail,
the steel rail insulation joint comprises an insulation sheet and a steel rail fishplate which are arranged at a steel rail gap, and the steel rail insulation joint is used for realizing the electrical isolation function of two ends of the insulation joint;
the T-shaped busbar comprises a first port, a second port and a third port, the first port and the second port are both static contacts, the first port is used for being connected with a moving end of the first moving contact, the second port is used for being connected with a moving end of the second moving contact, and the third port is used for being connected with a negative electrode cabinet of a direct-current traction power supply system through a cable;
the first moving contact is connected with one end of a steel rail insulation section through a first shunt and a cable, the second moving contact is connected with the other end of the steel rail insulation section through a second shunt and a cable, the T-shaped busbar is connected with or disconnected from the steel rail insulation section through moving the first moving contact and the second moving contact, and the backflow state of a negative electrode cabinet of the direct-current traction power supply system is controlled according to the requirements of testing or other operations. As an example, when the rail transit normally operates, the moving contact and the fixed contact of the backflow device are in a closed position, that is, the electric rail transit is in a working condition, and when the rail transit is in a skylight period, that is, when a train is not arranged on a line, the backflow device can be remotely switched off, so that the segmented steel rail can be conveniently subjected to related maintenance operation.
Fig. 1 is a schematic structural diagram of a rail return device for a dc traction power supply system according to an embodiment of the present invention. As shown in fig. 1, optionally, the first moving contact and the second moving contact are connected through an insulating linkage rod, the insulating linkage rod is connected to the motor, the insulating linkage rod is operated by the motor to realize synchronous operation of the position states of the two moving contacts, and the two moving contacts are operated synchronously to realize electrical conduction and electrical isolation with the corresponding fixed contacts respectively, that is, the two moving contacts are both in an open state or a closed state.
Fig. 2 is a second schematic structural diagram of a rail return apparatus for a dc traction power supply system according to an embodiment of the present invention. As shown in fig. 2, optionally, the first moving contact is connected to a first motor, the second moving contact is connected to a second motor, and the two independent motors independently perform switching on and off operations on their respective moving contacts.
Fig. 3 is a third schematic structural diagram of a rail return device for a dc traction power supply system according to an embodiment of the present invention. As shown in fig. 3, optionally, the first moving contact and the second moving contact are connected through an insulating linkage rod, the insulating linkage rod is connected to a manual rocker, the insulating linkage rod is operated by the manual rocker, so that the synchronous operation of the position states of the two moving contacts can be realized, and the two moving contacts are operated synchronously to realize electrical conduction and electrical isolation with the corresponding fixed contacts respectively, that is, the two moving contacts are both in an open state or a closed state.
Fig. 4 is a schematic view of a T-shaped busbar installation manner provided by the embodiment of the present invention. As shown in fig. 4, optionally, the T-shaped bus bar (preferably made of copper) is mounted on the reflow apparatus housing or the concrete side wall in an insulating manner through a supporting insulator, the reflow apparatus can be mounted in a housing, and the T-shaped bus bar, the moving contact, the static contact and the metal conductor inside the apparatus directly connected thereto are mounted in an insulating manner with the reflow apparatus housing through the supporting insulator. Because the T-shaped busbar, the moving contact and the static contact are connected with the rail of the rail transit through cables, and the rail of the rail transit is installed in an insulating way, the electric working condition of the existing rail in the insulating way cannot be changed by using the backflow device, the backflow device can also be directly installed on the wall of a concrete structure directly through accessories such as a supporting insulator, a bolt, channel steel and the like without passing through a shell, and the electric working condition of the existing rail in the insulating way cannot be changed by installing the backflow device.
Optionally, the backflow device further comprises a monitoring module, the monitoring module comprises a monitoring camera and a signal transmission medium, preferably, the monitoring camera is installed inside the backflow device, the monitoring function of implementing the state position of the moving contact and the static contact is achieved, video information is uploaded to the power monitoring system in real time through the signal transmission medium, and meanwhile, the power monitoring system can control the state position of the moving contact and the static contact of the backflow device through a remote control motor.
Optionally, the backflow device further includes an auxiliary switch, the auxiliary switch includes a contact as a passive output node, the contact is used for outputting the moving contact state position to the outside, the switching position of the contact (contact) of the auxiliary switch is switched on and off by being driven by the mechanical action of the moving contact, the contact (contact) inside the auxiliary switch can be used as a passive output node (secondary auxiliary contact) for outputting the moving contact state position to the outside, and the electric locking function can be realized with equipment such as a direct current breaker switch cabinet of a substation.
Fig. 5 is a schematic structural diagram of a detection system for the rail reflow apparatus according to an embodiment of the present invention. As shown in fig. 5, the detection system includes a dc power supply, a high-precision voltage collection module, a micro-processing module and a display module, the two ends of the dc power supply are respectively connected with one end of a first shunt close to a steel rail insulation joint and one end of a second shunt close to the steel rail insulation joint, the high-precision voltage collection module is respectively connected with the two ends of a fixed length (L) steel rail in the steel rail insulation joint between the first shunt and the second shunt, the high-precision voltage collection module is also respectively connected with the two ends of a fixed length (L) steel rail outside the steel rail insulation joint between the first shunt and the second shunt, as an example, the length of L is not less than 5m, and the specific process of testing the performance of the insulation joint is as follows: the moving contact and the static contact of the reflux device are separated, namely in an electrical isolation state, and are connected to a measuring terminal in the reflux device through a direct-current power supply, and meanwhile, the input current of the direct-current power supply is I (I is preferably not lower than 50A). The high-precision voltage acquisition device is used for respectively acquiring longitudinal voltage drops U1 and U2 (the length of L is preferably not less than 5m) of the steel rail with the same length L on the inner side and the outer side of the steel rail insulation joint. The MCPU calculates the acquired voltage signals by a calculation method of the following formula to realize result input, and the output result directly outputs the test result through an LED screen with digital display;
the calculation method comprises the following steps:
steel rail insulating joint performance evaluation index FJComprises the following steps:
wherein: u shape1，on、U2，onThe average value of the voltage within 1 minute after the current is injected into the steel rail; u shape1，off、U2，offThe average value of the rail voltage noise in 1 minute when no current is injected.
When the insulation junction performance index FJAnd when the voltage is less than or equal to 95 percent, the electric connection exists between the insulating joints, and the fault defect exists.
The direct current traction power supply system generally adopts a DC750V or DC1500V overhead contact network or a contact rail for power supply, the anode of a rectifier is connected with a direct current positive bus through an incoming line direct current cabinet, and a feeder line direct current cabinet communicates the direct current positive bus with the direct current traction network through an internet isolating switch. The locomotive gets electricity through a positive traction network through a pantograph or a collector shoe, and flows back to a negative bus through a traveling rail (steel rail) to return to the negative electrode of the rectifier so as to form a complete electric loop. The conventional rail transit generally has 4 loops of direct current feeder lines divided into a traction network for providing electric energy for an uplink left line, a right line and a downlink left line and a downlink right line. The utility model discloses a rail reflux unit sets up two rail insulated joints respectively through near drawing the institute at last down rail, will go upward left side line, the right side line of rail and down the left side line and the right side line of rail and realize electrical isolation respectively. Through two rail insulation festival both ends installation in parallel at last down the utility model discloses the device, rethread cable are connected to the burden generating line of pulling the electric substation. Under the normal operation working condition, the moving contact in the reflux device near the traction substation is in the closed working condition, the equivalent steel rail insulation joint is short-circuited, and the locomotive can still ensure the working condition of bilateral power supply when taking current between the two traction substations. When a certain traction station is disconnected and quits operation, the moving contact of the reflux device in the traction station is still in a closed working condition, equivalent steel rail insulation joints at the position are still short-circuited, the on-line cross-area isolating switch of the traction station is closed, the locomotive can still be ensured to take power from two adjacent traction stations, and the working condition of large bilateral power supply can be ensured. When the steel rail needs to be segmented in a skylight period, the left line and the right line of the ascending steel rail and the left line and the right line of the descending steel rail can be respectively electrically isolated by remotely or locally controlling the backflow device near the traction station to be in a dividing state.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A steel rail reflux device for a direct current traction power supply system is characterized by comprising a T-shaped bus bar, a first moving contact, a second moving contact, a first current divider, a second current divider and a steel rail insulation joint,
the steel rail insulating joint comprises an insulating sheet and a steel rail fishplate which are arranged at a steel rail gap;
the T-shaped busbar comprises a first port, a second port and a third port, the first port and the second port are both static contacts, the first port is connected with the moving end of the first moving contact, the second port is connected with the moving end of the second moving contact, and the third port is connected with a negative electrode cabinet of the direct-current traction power supply system through a cable;
the first moving contact is connected with one end of the steel rail insulation section through a first shunt and a cable, and the second moving contact is connected with the other end of the steel rail insulation section through a second shunt and a cable.
2. A rail return apparatus for a dc traction power supply system as claimed in claim 1, wherein the first movable contact and the second movable contact are connected by an insulating linkage, and the insulating linkage is connected to a motor.
3. A rail return apparatus for a dc traction power supply system according to claim 1, wherein said first movable contact is connected to a first motor and said second movable contact is connected to a second motor.
4. A rail return device for a dc traction power supply system as claimed in claim 1, wherein the first movable contact and the second movable contact are connected by an insulating linkage, and the insulating linkage is connected to a manual rocker.
5. A rail return for a DC traction power supply system according to any one of claims 1 to 4, wherein the T-busbar is mounted in the return housing or concrete side wall by means of support insulator insulation.
6. A rail return apparatus for a DC traction power supply system according to any one of claims 1 to 4, wherein the return apparatus further includes a monitoring module, the monitoring module including a monitoring camera and a signal transmission medium.
7. A rail return arrangement for a DC traction power supply system according to any one of claims 1 to 4, wherein the return arrangement further includes an auxiliary switch including a contact as a passive output node.
8. A detection system for the steel rail backflow device of any one of claims 1 to 7, wherein the detection system comprises a direct current power supply, a high-precision voltage acquisition module, a micro-processing module and a display module, two ends of the direct current power supply are respectively connected with one end of a first shunt close to a steel rail insulation joint and one end of a second shunt close to the steel rail insulation joint, the high-precision voltage acquisition module is respectively connected with two ends of a fixed-length steel rail in the steel rail insulation joint between the first shunt and the second shunt, and the high-precision voltage acquisition module is also respectively connected with two ends of a fixed-length steel rail outside the steel rail insulation joint between the first shunt and the second shunt.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021935400.9U CN212332436U (en) | 2020-09-07 | 2020-09-07 | Steel rail backflow device and detection system for direct-current traction power supply system |
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| CN202021935400.9U CN212332436U (en) | 2020-09-07 | 2020-09-07 | Steel rail backflow device and detection system for direct-current traction power supply system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112046343A (en) * | 2020-09-07 | 2020-12-08 | 中铁第四勘察设计院集团有限公司 | Steel rail backflow device and detection system for direct-current traction power supply system |
| CN113238124A (en) * | 2021-03-29 | 2021-08-10 | 中车青岛四方机车车辆股份有限公司 | Alternating current insulation detection system and method and railway vehicle |
-
2020
- 2020-09-07 CN CN202021935400.9U patent/CN212332436U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112046343A (en) * | 2020-09-07 | 2020-12-08 | 中铁第四勘察设计院集团有限公司 | Steel rail backflow device and detection system for direct-current traction power supply system |
| CN113238124A (en) * | 2021-03-29 | 2021-08-10 | 中车青岛四方机车车辆股份有限公司 | Alternating current insulation detection system and method and railway vehicle |
| CN113238124B (en) * | 2021-03-29 | 2022-09-13 | 中车青岛四方机车车辆股份有限公司 | Alternating current insulation detection system and method and railway vehicle |
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