CN217240318U - Rail potential limiting device and system - Google Patents
Rail potential limiting device and system Download PDFInfo
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- CN217240318U CN217240318U CN202122709324.0U CN202122709324U CN217240318U CN 217240318 U CN217240318 U CN 217240318U CN 202122709324 U CN202122709324 U CN 202122709324U CN 217240318 U CN217240318 U CN 217240318U
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Abstract
The application discloses a steel rail potential limiting device and a steel rail potential limiting system, which comprise a potential collecting device and a control protection device which are electrically connected, wherein the potential collecting device is used for collecting the potential of a steel rail, converting the collected potential into a potential analog quantity and sending the potential analog quantity to the control protection device; the control protection device is used for receiving the potential analog quantity sent by the potential acquisition device, judging whether the potential analog quantity is in a preset voltage range or not, and controlling whether the steel rail is grounded or not according to a judgment result. According to the technical scheme that this application embodiment provided, can realize the accurate control to rail voltage through providing a rail potential limiting device, carry out online oscillography and record to exceeding the high voltage that sets for in the valve to whether carry out the judgement and the operation that the rail ground connection according to the rail voltage that detects, can carry out accurate judgement to the condition of train rail, guarantee the device's accurate operation.
Description
Technical Field
The utility model relates to a public transport field especially relates to rail potential limiting device and system.
Background
In recent years, with the rapid development of social economy and the acceleration of urbanization process, the problem of traffic trip is increasingly prominent, and the vigorous development of urban rail transit becomes a main way for solving the problem. The urban rail transit system is complex and has a plurality of devices, and the installation quality of the devices is related to safe operation, in particular to direct current traction power supply system devices. In the urban rail transit traction power supply system, electric energy is transmitted to an electric train from a traction substation through a feeder line, a contact network or a contact rail, and then returned to the traction substation from an electric train through a traveling rail and a return line, and a power supply network consisting of the feeder line, the contact network (contact rail), a rail loop and the return line becomes a traction network. The rail transit traction power supply system is different from a conventional alternating current power distribution system, the power supply mode adopts three-rail power supply, and positive and negative electrodes are respectively supplied with power and return current through a contact rail and a traveling rail. In order to reduce the corrosion of stray current to subway tunnel structure metal (steel bars, embedded metal pipelines and the like) and prevent potential difference between the positive electrode and the ground from causing potential safety hazards, direct current switch cabinets in a subway traction substation are all installed in an earth insulation mode, namely the positive electrode and the negative electrode are all insulated to the earth. Because the steel rail is connected with the cathode of the power supply, if the anode is in ground fault, the personal safety of passengers is threatened greatly. Therefore, it is an effective scheme for protecting all dc switch equipments by protecting the positive electrode grounding (case collision) that may occur, installing the dc switch cabinets in an insulating manner, setting the rail potential limiting device, and then concentrating one point to ground through the current protection element.
However, in the existing rail potential limiting devices, the rail potential limiting devices frequently operate or directly operate in a grounding mode. The device aims at the condition that a steel rail potential limiting device of a substation in a station frequently acts, so that the steel rail is easily grounded, and stray current is leaked. The corrosion of metal pipelines around the subway is aggravated, accidents are caused, and the personal safety is endangered. And the rail potential limiting device is provided with III section protection, when the III section protection is operated, the direct current contactor is closed, manual resetting is needed, and therefore operation maintenance personnel are not changed.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned shortcomings or drawbacks of the prior art, it is desirable to provide a rail potential limiting device and system.
In a first aspect, a steel rail potential limiting device is provided, which comprises a potential acquisition device and a control protection device which are electrically connected,
the potential acquisition device is used for acquiring the potential of the steel rail, converting the acquired potential into potential analog quantity and sending the potential analog quantity to the control protection device;
the control protection device is used for receiving the potential analog quantity sent by the potential acquisition device, judging whether the potential analog quantity is in a preset voltage range or not, and controlling whether the steel rail is grounded or not according to a judgment result.
Optionally, the electric potential collecting device includes:
the detection resistor is connected with a first terminal to a steel rail, and a second terminal to the ground and used for collecting the potential of the steel rail;
the front end of the rectifier bridge circuit is arranged at two ends of the detection resistor and is used for filtering alternating current interference in the detected steel rail potential and rectifying the alternating current interference into primary loop voltage;
and the voltage measuring amplifier is connected to the rear end of the rectifier bridge circuit and is used for converting the primary loop voltage into potential analog quantity.
Optionally, the rectifier bridge circuit includes a first rectifier module, a second rectifier module, a third rectifier module, and a fourth rectifier module,
the first rectifying module and the third rectifying module are connected in series in an opposite direction and are connected with the detection resistor in parallel,
the second rectifying module and the fourth rectifying module are connected in series in an opposite direction and are connected in parallel with the detection resistor.
Optionally, the first rectification module, the second rectification module, the third rectification module, and the fourth rectification module are two diodes connected in series.
Optionally, the control protection device is specifically configured to: and receiving the potential analog quantity, controlling the steel rail to be not grounded if the potential analog quantity is within the preset voltage range, and controlling the steel rail to be grounded if the potential analog quantity exceeds the preset voltage range.
Optionally, the system also comprises a sensor system arranged at the train entrance and exit, the sensor system is connected with the control protection device in a communication way,
the system is used for detecting whether the train enters or leaves and sending the entering and leaving information of the train to the control protection device.
Optionally, the sensor system includes a laser and a laser detector, and the laser detector are respectively disposed on two sides of the train traveling direction.
Optionally, after the train enters the station, the corresponding predetermined voltage range is different from that after the train leaves the station.
Optionally, the control protection device is further configured to record the acquired potential signal;
the system also comprises a communication module used for communicating with the background.
In a second aspect, a rail potential limiting system is provided, which comprises the rail potential display device.
According to the technical scheme that this application embodiment provided, can realize the accurate control to rail voltage through providing a rail potential limiting device, carry out online oscillography and record to exceeding the high voltage that sets for in the valve to whether carry out the judgement and the operation that the rail ground connection according to the rail voltage that detects, can carry out accurate judgement to the condition of train rail, guarantee the device's accurate operation.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic structural diagram of a steel rail potential limiting device according to the present embodiment;
FIG. 2 is a schematic structural diagram of a potential collecting device according to the present embodiment;
fig. 3 is a schematic circuit diagram of the potential collecting device and the control protection device in this embodiment.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, the present embodiment provides a rail potential limiting device, which is characterized by comprising a potential collecting device 10 and a control protection device 20 electrically connected to each other,
the electric potential acquisition device 10 is used for acquiring the electric potential of the steel rail, converting the acquired electric potential into electric potential analog quantity and sending the electric potential analog quantity to the control protection device 20;
the control protection device 20 is configured to receive the potential analog quantity sent by the potential acquisition device 10, determine whether the potential analog quantity is within a predetermined voltage range, and control whether the steel rail is grounded according to the determination result.
The embodiment of the application can realize the accurate monitoring to rail voltage through providing a rail potential limiting device, carries out online oscillography and record to exceeding the high voltage of settlement within range to whether the judgement and the operation that the rail ground connection whether carry out according to the rail voltage that detects can carry out accurate judgement to the condition of train rail, guarantees the device's accurate operation.
Further, the electric potential collecting device 10 includes:
the detection resistor 11 is provided with a first terminal connected to a steel rail and a second terminal grounded and used for collecting the potential of the steel rail;
the front end of the rectifier bridge circuit 12 is installed at two ends of the detection resistor 11 and used for filtering alternating current interference in detected rail potential and rectifying the alternating current interference into primary loop voltage;
and the voltage measuring amplifier 13 is connected to the rear end of the rectifier bridge circuit 12 and is used for converting the primary loop voltage into the potential analog quantity.
The part is the potential acquisition device 10 structure sketch map that this embodiment adopted as shown in fig. 2, wherein adopts one-level high isolation switching circuit as this potential acquisition device 10's circuit structure, compares the two-stage sampling circuit that uses among the prior art, and its precision has promoted one-level to withstand voltage shock-resistant ability is strong, and simple structure simultaneously, it is all more convenient to maintain, and the field usage of being more convenient for.
The detection resistor 11 is connected to a steel rail and the ground, the potential of the steel rail is detected in real time, the detection resistor 11 is connected to the front end of the rectifier bridge circuit 12, alternating current interference in the detected potential of the steel rail is filtered through the rectifier bridge circuit 12, primary loop voltage is rectified, the alternating current interference in a loop is filtered, or the alternating current interference in the loop is converted into direct current components, the influence of an alternating current signal on the whole measurement result can be eliminated, and meanwhile, the isolation effect on the loop can be realized through the voltage measurement amplifier 13;
the rear end of the rectifier bridge circuit 12 is connected with a voltage measuring amplifier 13, which amplifies the detected potential signal, converts the signal into a potential analog quantity, and then transmits the potential analog quantity to the control protection device 20, and the voltage measuring amplifier 13 controls the analog quantity input end of the protection device 20, and determines whether the detected potential of the travelling rail is within a preset voltage range by performing certain operation and judgment according to the potential analog quantity.
Further, the rectifier bridge circuit 12 includes a first rectifier module, a second rectifier module, a third rectifier module and a fourth rectifier module,
the first rectifying module and the third rectifying module are connected in series in an inverse manner and are connected with the detection resistor 11 in parallel,
the second rectifying module and the fourth rectifying module are connected in series in an opposite direction and are connected in parallel with the detection resistor 11.
Specifically, referring to fig. 3, a schematic circuit structure diagram of the electric potential collecting device 10 is shown, a rectifier bridge circuit 12 is formed by arranging a first rectifier module, a second rectifier module, a third rectifier module and a fourth rectifier module, wherein a detection resistor 11 is connected in series in the rectifier bridge circuit 12, a voltage amplifier has two input ports, one of the two input ports is connected between the first rectifier module and the third rectifier module, and the other port is connected between the second rectifier module and the fourth rectifier module, so as to transmit a signal of the rectifier bridge circuit 12 into the voltage amplifier.
Further, the first rectification module, the second rectification module, the third rectification module and the fourth rectification module are two diodes connected in series.
Each rectifier module in the embodiment is realized by two diodes connected in series, and the voltage resistance and the impact resistance of the rectifier circuit can be improved.
Further, the control protection device 20 is specifically configured to: and receiving the potential analog quantity, controlling the steel rail to be not grounded if the potential analog quantity is within the preset voltage range, and controlling the steel rail to be grounded if the potential analog quantity exceeds the preset voltage range.
In this embodiment, the control protection device 20 controls whether the rail is grounded, wherein the control protection device 20 obtains a potential analog signal of the running rail from the potential acquisition device 10, determines whether the rail needs to be grounded according to the analog signal, determines that the rail needs to be grounded if the detected analog signal is outside a set voltage range, and controls the rail to perform a grounding operation through the control protection device 20. In addition, in the embodiment, when the steel rail is in grounding action, the steel rail is in short circuit with the ground, and the steel rail is recovered to be disconnected after a set period of time after the voltage is reduced.
Further, the system also comprises a sensor system 30 arranged at the train entrance and exit, the sensor system 30 is connected with the control protection device 20 in a communication way,
and is configured to detect whether the train enters or exits the station, and send the information of entering and exiting the station to the control protection device 20.
In the embodiment, the laser sensor system 30 is additionally arranged, the detection of train entering and exiting is increased, a signal of whether the train enters the station or not obtained by the sensor system 30 is introduced into the judgment logic of the protection of the steel rail potential limiter, the rail potential after the train enters the station is analyzed and discriminated, the misinformation action of voltage faults is eliminated, and the rail potential is monitored and protected more accurately in the operation process. The communication between the system and the control and protection device can be in various ways, such as wifi or the like.
In urban rail transit, the driving area and the power receiving line of a train originally belong to a closed area, and in recent years, subway operation pays more attention to safety protection measures of personnel in a subway station, and a shielded door system is introduced. When the train does not enter the station, passengers on the platform cannot contact the running steel rail and the train, and the passengers in the running train are in an equipotential environment. In this case, the level of the potential of the running rail does not affect all the people in the station. Only when a train enters a station and stops and passengers get on or off the train, the passengers can form equal potential with a traveling rail through the train, and the over-high rail potential causes the step voltage to be formed, so that electric shock accidents occur. Therefore, the rail potential limiting device in the embodiment is additionally provided with the train entering detection sensor in the station, the entering/exiting signal of the train is introduced into the protection logic of the rail potential limiting device to serve as a judgment condition, the rail potential after the train enters the station is analyzed and screened, and the rail potential limiting device is only put into use after the train enters the station, so that the safety of people getting on and off the train is ensured, the action frequency of the device is greatly reduced, the service life of the device is prolonged, and meanwhile, the corrosion of stray current to the rail is also reduced.
Further, the sensor system 30 includes a laser and a laser detector, which are respectively disposed at both sides of the train traveling direction.
In this embodiment, a laser sensor is adopted as the sensor system 30, and at least includes a laser and a laser detector, which are arranged on both sides of the train traveling direction, and when the train enters or leaves, the laser sensor can detect the train; in the embodiment, a laser technology is selected as a measuring sensor, the laser sensor is used as a novel measuring instrument, and the device has the advantages of capability of realizing non-contact remote measurement, high speed, high precision, wide measuring range, strong light and electric interference resistance and the like.
Further, after the train enters the station, the corresponding preset voltage range is different from that after the train leaves the station.
The condition of rail voltage judgement is introduced with the condition of train business turn over station in this embodiment, and is more intelligent, when the in service behavior of rail accords with, can also reduce the operating frequency of device, postpones the life of device.
Further, the control protection device 20 is further configured to record the acquired potential signal;
the system also comprises a communication module used for communicating with the background.
The control protection device 20 provided in this embodiment can also record and store various collected signals, and has a communication module to implement communication connection with a background; besides, the PLC has a control protection monitoring function, a multi-CPU structure is further provided, each functional module is relatively independent, the system reliability is high, a comprehensive and complete protection function is achieved, and each fault has multiple protection reactions. The action behaviors and wave recording data of each internal element can be recorded; recording internal calculation values when each internal element acts; the device has extremely strong data processing, logical operation and information storage capacities, the number of recordable wave recording reports reaches 10, the number of recordable events reaches 1000, detailed and accurate theoretical analysis data are provided for event analysis after actions or faults, and meanwhile, the information cannot be lost after the device is powered down; high-precision and high-stability devices are selected, so that the high precision of normal operation is ensured, and the increase of sampling errors caused by environmental change or long-term operation is avoided.
In this embodiment, a microcomputer protection device is preferably used as the control protection device 20, which has the advantages of powerful operation function, faster response, SOE (event sequence recording) function, event sequence recording resolution no greater than 1ms, powerful communication function, and the like, compared with a common programmable controller.
The model CPD-100 microcomputer protection device is preferably adopted in the embodiment.
The embodiment also provides a steel rail potential limiting system which comprises the steel rail potential display device.
The steel rail potential limiting system in the embodiment comprises the device in the embodiment and further comprises a background system and other structures, the real-time state of the current device is monitored through the background system, data detected and obtained by the current device are monitored and recorded in real time, follow-up viewing is facilitated, data can be discussed and summarized, the steel rail potential limiting system can be in communication connection with the background system, and the steel rail potential limiting device is improved in real time.
The innovative improvement of a novel steel rail potential limiting system can greatly reduce the misoperation times of a main loop device of a rail potential cabinet, so that the safety of train passengers can be ensured more accurately, the corrosion of a steel rail under stray current is reduced, the working times of device elements are reduced, and the service life is prolonged; the innovation of the steel rail potential limiting device further improves the informatization and intelligent degree of the cabinet type, so that the grade of man-machine operation, intelligent operation and maintenance, equipment and internet of things capability and the like is improved, the improvement of the safety protection capability of the whole direct current power supply system is facilitated, and the whole track power supply system is more intelligent, safe and efficient in operation.
It will be understood that any orientation or positional relationship indicated above with respect to the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc., is based on the orientation or positional relationship shown in the drawings and is for convenience in describing and simplifying the invention, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be considered limiting; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may also be oriented 90 degrees or at other orientations and the spatially relative descriptors used herein interpreted accordingly.
The foregoing description is only exemplary of the preferred embodiments of the application and is illustrative of the principles of the technology employed. It will be understood by those skilled in the art that the scope of the present invention is not limited to the specific combination of the above-mentioned features, but also covers other embodiments formed by any combination of the above-mentioned features or their equivalents without departing from the spirit of the present invention. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (10)
1. A steel rail potential limiting device is characterized by comprising a potential acquisition device and a control protection device which are electrically connected,
the potential acquisition device is used for acquiring the potential of the steel rail, converting the acquired potential into potential analog quantity and sending the potential analog quantity to the control protection device;
the control protection device is used for receiving the potential analog quantity sent by the potential acquisition device, judging whether the potential analog quantity is in a preset voltage range or not, and controlling whether the steel rail is grounded or not according to a judgment result.
2. A rail potential limiting device according to claim 1, wherein the potential collecting means comprises:
the detection resistor is connected with a first terminal to a steel rail, and a second terminal to the ground and used for collecting the potential of the steel rail;
the front end of the rectifier bridge circuit is arranged at two ends of the detection resistor and is used for filtering alternating current interference in detected steel rail potential and rectifying the alternating current interference into primary loop voltage;
and the voltage measuring amplifier is connected to the rear end of the rectifier bridge circuit and is used for converting the primary loop voltage into the potential analog quantity.
3. A rail potential limiting device according to claim 2 wherein the rectifier bridge circuit comprises a first rectifier module, a second rectifier module, a third rectifier module and a fourth rectifier module,
the first rectifying module and the third rectifying module are connected in series in an opposite direction and are connected with the detection resistor in parallel,
the second rectifying module and the fourth rectifying module are connected in series in an opposite direction and are connected in parallel with the detection resistor.
4. The steel rail potential limiting device of claim 3, wherein the first rectifying module, the second rectifying module, the third rectifying module and the fourth rectifying module are two diodes connected in series.
5. A rail potential limiting device according to claim 2, wherein the control and protection device is specifically configured to: and receiving the potential analog quantity, if the potential analog quantity is within the preset voltage range, controlling the steel rail to be not grounded, and if the potential analog quantity exceeds the preset voltage range, controlling the steel rail to be grounded.
6. A rail potential limiting device according to claim 1 further comprising sensor systems mounted at the entrance and exit of the train, said sensor systems being in communication with the control and protection device,
the system is used for detecting whether the train enters or leaves the station or not and sending the information of the train entering and leaving the station to the control protection device.
7. A rail potential limiting device according to claim 6 wherein the sensor system includes a laser and a laser detector, the laser and the laser detector being respectively disposed on either side of the direction of travel of the train.
8. The rail potential limiting apparatus according to claim 6, wherein the predetermined voltage ranges after the train is on and after the train is off are different from each other.
9. A rail potential limiting device as claimed in claim 1 wherein the control and protection device is further adapted to record the collected potential signal;
the system also comprises a communication module used for communicating with the background.
10. A rail potential limiting system comprising a rail potential display device according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122709324.0U CN217240318U (en) | 2021-11-04 | 2021-11-04 | Rail potential limiting device and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122709324.0U CN217240318U (en) | 2021-11-04 | 2021-11-04 | Rail potential limiting device and system |
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| Publication Number | Publication Date |
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| CN217240318U true CN217240318U (en) | 2022-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122709324.0U Active CN217240318U (en) | 2021-11-04 | 2021-11-04 | Rail potential limiting device and system |
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| CN (1) | CN217240318U (en) |
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- 2021-11-04 CN CN202122709324.0U patent/CN217240318U/en active Active
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