WO2019169951A1

WO2019169951A1 - Outdoor network access device, system and method for railway power supply system

Info

Publication number: WO2019169951A1
Application number: PCT/CN2019/070658
Authority: WO
Inventors: 赵朝蓬; 陈军; 罗利平; 叶涛; 金良赞
Original assignee: 信承瑞技术有限公司
Priority date: 2018-03-07
Filing date: 2019-01-07
Publication date: 2019-09-12
Also published as: CN108215943A

Abstract

Disclosed are an outdoor network access device, system and method for a railway power supply system. The device comprises: a network access body module and a network access peripheral module, wherein the network access body module comprises: a current transformer (100), an isolation unit and an isolation monitoring unit; the network access peripheral module comprises a support frame; the isolation unit comprises an isolation switch and a mechanism case (102); a first terminal (100a) of the current transformer (100) is connected to a catenary; a second terminal (100b) of the current transformer (100) is provided with a fixed contact (103) of the isolation switch; a first terminal (104a) of a body (104) of the isolation switch is connected to a traction transformer power supply line, a second terminal (104b) of the body (104) of the isolation switch is provided with a moving contact (105) of the isolation switch, and the moving contact (105) of the isolation switch is fitted with the fixed contact (103) of the isolation switch; the isolation monitoring unit is arranged in the mechanism case (102) and is electrically connected to the isolation unit; and the current transformer (100), the isolation switch and the mechanism case (102) are all arranged on the support frame. The outdoor network access device, system and method improve the speed and accuracy of determination of the position of a fault point of the catenary.

Description

Outdoor internet device, system and method for railway power supply system

Technical field

The present invention relates to the field of railway electrical, and in particular to an outdoor internet access device, system and method for a railway power supply system.

Background technique

The electric traction power supply system of the direct power supply mode of the electrified railway with return line at home and abroad is composed of traction substation, traction network, zoning station and other auxiliary power supply facilities; the above traction net is made up of contact net, rail, earth, return line Composition; the above contact net is composed of a bearing cable and a contact wire.

At present, when the contact network fails, in order to determine the location of the fault point, an electrified railway contact network fault detecting device is arranged in the traction substation, and the device can be used on the single and double-line contact network feeder, and can be automatically measured under the charged state. Its fault point location. The device determines the location of the fault point by calculating the distance of the fault point from the traction substation. However, since the fault point direction cannot be discriminated, the fault point position given by the fault point calibration device is a range, and it is necessary to manually determine the fault point. The location seriously affects the accident repair time and cannot meet the requirements of rapid repair; the set isolation switch does not have any monitoring capability, and there is no other monitoring means on the contact network. Therefore, there is a defect that it takes a long time and poor accuracy to determine the location of the fault point.

In view of the above problem of determining the location of the fault point of the contact network and the poor accuracy, no effective solution has been proposed yet.

Summary of the invention

In view of this, an object of embodiments of the present invention is to provide an outdoor internet access device, system, and method for a railway power supply system to improve the speed and accuracy of determining the location of a fault point of a contact network.

In a first aspect, an embodiment of the present invention provides an outdoor Internet access device for a railway power supply system, the device comprising an Internet main body module and an Internet peripheral module; the Internet main body module includes: a current transformer, an isolation unit, and an isolation monitoring unit. The internet peripheral module includes a support frame; the isolation unit includes an isolating switch and a mechanism box; the first terminal of the current transformer is connected to the contact net; and the second terminal of the current transformer is provided with a static contact of the isolating switch; The first terminal of the body of the isolating switch is connected with the power supply line of the traction substation, and the second terminal of the body of the isolating switch is provided with a moving contact of the isolating switch, and the moving contact of the isolating switch is matched with the static contact of the isolating switch The above-mentioned isolation monitoring unit is disposed in the mechanism box and electrically connected with the isolation unit; the current transformer, the isolating switch and the mechanism box are all disposed on the support frame.

In conjunction with the first aspect, the embodiment of the present invention provides a first possible implementation manner of the first aspect, wherein the isolation unit further includes an upper arm, a first transmission rod, a transition bracket, and a second transmission rod that are sequentially connected. a lower arm and a control component; the upper arm is connected to the pull rod of the isolating switch; the isolating switch comprises a body, a moving contact, a static contact and a tie rod; the movable contact is connected with the pull rod; the control component is disposed in the mechanism box .

In conjunction with the first possible implementation of the first aspect, the embodiment of the present invention provides a second possible implementation manner of the first aspect, wherein the upper arm, the first transmission rod, the transition bracket, and the second transmission rod The lower arm adopts a vertical push-pull type to connect the isolating switch and the control component; wherein the movable contact of the isolating switch is an upward opening mode.

In conjunction with the second possible implementation of the first aspect, an embodiment of the present invention provides a third possible implementation of the first aspect, wherein the control component comprises a manual opening and closing sub-part, an electric opening and closing sub-assembly The remote control switch component and the control switch are remotely controlled; the manual switch component, the electric switch component, and the remote control switch component are respectively connected to the lower arm by operating the changeover switch.

In conjunction with the third possible implementation of the first aspect, the embodiment of the present invention provides a fourth possible implementation manner of the first aspect, wherein the isolation monitoring unit and the manual opening and closing sub-part, the electric opening and closing sub-part The components, the remote control switch unit are connected, and the isolation unit is monitored.

With reference to the fourth possible implementation manner of the first aspect, the embodiment of the present invention provides the fifth possible implementation manner of the first aspect, wherein the foregoing isolation monitoring unit includes: an information collection component, configured to collect the operation of the isolation unit State and contact network fault current and voltage information; communication component for transmitting the operating state of the isolated unit collected by the information collecting component and the fault current and voltage information of the contact network to the remote device, and receiving the remote device according to the operation A control command issued in a state; a monitoring component for controlling remote control of the switching sub-assembly according to the control command.

With reference to the first aspect, the embodiment of the present invention provides a sixth possible implementation manner of the first aspect, wherein the isolation monitoring unit further includes a backup power supply and a power management component; and the power management component is in the case of an external power failure The backup power supply is controlled to supply power to the isolated monitoring unit.

With reference to the first aspect, the embodiment of the present invention provides a seventh possible implementation manner of the first aspect, wherein the support frame comprises a component base, an isolation switch bottom angle steel, an H-shaped steel column, a transition bracket angle steel, and a mechanism box fixing. An angle steel; the base of the component is connected with the top angle steel of the isolation switch; the angle of the isolation switch is arranged on the top of the H-shaped steel column; the angle of the transition bracket is arranged in the middle of the column of the H-shaped steel column, and is connected with the transition bracket; The box fixed angle steel is placed at the lower part of the H-shaped steel column and connected to the mechanism box.

In a second aspect, an embodiment of the present invention provides an outdoor Internet access system for a railway power supply system, which includes the above-mentioned outdoor Internet access device for a railway power supply system, and includes a contact net and traction connected to the outdoor Internet access device. Substation.

In a third aspect, an embodiment of the present invention provides a method for controlling an access network network by using an outdoor Internet access system for a railway power supply system, including: an isolation monitoring unit collecting an operation state of the isolation unit and information about a fault current and voltage of the contact network The isolation monitoring unit sends the collected operating status and fault current and voltage information to the remote device, so that the remote device locates the fault point according to the operating state and the fault current and voltage information, and issues a control command; the isolation monitoring unit The opening and closing of the isolation unit is controlled according to the control command.

An outdoor internet access device, system and method for a railway power supply system provided by an embodiment of the present invention realizes the isolation of a power grid by using a current transformer, and the isolation of the circuit is implemented by using an isolation unit, and the isolation can be realized by using an isolation monitoring unit. Remote monitoring and control of the unit, as well as real-time monitoring of current and voltage in the circuit; the above device can realize remote monitoring of the isolation unit and quick and accurate judgment of the location of the fault point of the contact network, thereby facilitating the rapid failure of the contact network. service.

The above described objects, features and advantages of the present invention will become more apparent from the aspects of the appended claims.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly described below. It should be understood that the following drawings show only certain embodiments of the present invention, and therefore It should be seen as a limitation on the scope, and those skilled in the art can obtain other related drawings according to these drawings without any creative work.

1 is a structural diagram of an outdoor internet access device for a railway power supply system according to an embodiment of the present invention;

FIG. 2 is a flow chart showing a method for controlling an access network of an outdoor internet access system applied to a railway power supply system according to an embodiment of the present invention.

Illustration:

100-current transformer 100a-first terminal of current transformer

100b-second terminal of current transformer 101-H steel column

102-mechanical box 103-static contact of the isolating switch

104-isolator body 104a-first terminal of the body of the isolating switch

104b-second terminal of the body of the isolating switch 105-moving contact of the isolating switch

106-upper arm 107-first transmission rod

108-transition bracket 109-second transmission rod

110-lower arm 111-isolator switch lever

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. The components of the embodiments of the invention, which are generally described and illustrated in the figures herein, may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention in the claims All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Considering the problem that the existing access device for the railway power supply system has a long time and poor accuracy in determining the location of the fault point of the contact network, the embodiment of the invention provides an outdoor internet access device, system and method for the railway power supply system The technology can be implemented by using related software and hardware, which will be described below by way of embodiments.

Example 1

See Figure 1 for a block diagram of an outdoor internet access device for a railway power supply system.

The outdoor internet access device for the railway power supply system comprises an internet main body module and an internet peripheral module; the internet main body module comprises: a current transformer 100, an isolation unit and an isolation monitoring unit; the internet peripheral module comprises a support frame; the isolation unit comprises an isolation The switch and the mechanism box 102; the first terminal 100a of the current transformer is connected to the contact net; the second terminal 100b of the current transformer is provided with the static contact 103 of the isolating switch; the first terminal 104a of the body of the isolating switch is electrically connected to the traction The power supply line is connected, the second terminal 104b of the body of the isolating switch is provided with the movable contact 105 of the isolating switch, and the moving contact 105 of the isolating switch is matched with the static contact 103 of the isolating switch; the above-mentioned isolation monitoring unit is disposed in the mechanism The box 102 is electrically connected to the isolation unit; the current transformer 100, the isolating switch and the mechanism box 102 are all disposed on the support frame.

It should be noted that similar reference numerals and letters indicate similar items in the following figures, and therefore, once an item is defined in a drawing, it is not necessary to further define and explain it in the subsequent drawings.

When the isolation unit is in operation, the isolation switch performs switching; when the isolation switch is closed, the movable contact of the isolation switch just enters the socket of the static contact; the depth of the movable contact entering the socket may be greater than Or equal to 90% of the length of the static contact, the moving contact and the bottom of the static contact maintain a distance of 3 to 5 mm to prevent the transitional impact of the insulator in the static contact during the closing process. In addition, when the moving contact and the static contact are selected, the contact with the impact resistance less than or equal to 1100 Newton can be selected.

The above current transformers are usually composed of a closed core and a winding. The current transformer has a small number of turns of the primary winding, and is stringed in the line of the current to be measured. Therefore, it often has all the current flowing through the line, and the number of turns of the secondary winding is relatively large, and is connected in series in the measuring instrument and the protection circuit. When the current transformer is in operation, its secondary circuit is always closed, so the impedance of the series coil of the measuring instrument and the protection circuit is small, and the working state of the current transformer is close to the short circuit.

In the actual application of the current transformer, the application environment can refer to the following parameters: the ambient temperature can be between -25 ° C and 40 ° C, and the daily average temperature preferably does not exceed 35 ° C; the altitude of the current transformer application environment is generally preferably not More than 1000 meters, and the maximum wind speed of the environment is less than or equal to 34m / s, the relative humidity of the environment is: the daily average relative humidity does not exceed 95%, the monthly average relative humidity does not exceed 90%; the seismic resistance of the current transformer is: The horizontal acceleration is 0.25g, the vertical acceleration is 0.125g (g is the unit of gravity); the current transformer can be operated for a long time at 1.2 times the rated voltage and 1.2 times the rated current; and the device type of the current transformer belongs to the outdoor composite insulation fully enclosed structure.

When the above current transformer is used, it usually has the following precautions:

(1) The wiring of the current transformer should follow the principle of series: that is, the primary winding should be connected in series with the circuit under test, and the secondary winding should be connected in series with all instrument loads.

(2) According to the magnitude of the current to be measured, select the appropriate change, otherwise the error will increase. At the same time, the secondary side is grounded at one end to prevent the primary side from breaking into the secondary low-voltage side when the insulation is damaged, causing personal and equipment accidents.

(3) The secondary side is not allowed to open the way. As soon as the circuit is opened, the primary current becomes a magnetizing current, causing the core to be oversaturated and magnetized, causing severe heat or even burning the coil. At the same time, the magnetic circuit is excessively saturated and magnetized, so that the error is increased. When the current transformer is in normal operation, the secondary side approximates the short circuit. If it is suddenly opened, the excitation electromotive force suddenly changes to a large value from a small value, and the magnetic flux in the iron core presents a severely saturated flat top. Wave, so the secondary winding will induce a very high apex wave when the magnetic flux passes through zero, and its value can reach thousands or even tens of thousands of volts, endangering the safety of workers and the insulation performance of the instrument. In addition, the primary side open circuit causes the secondary side voltage to reach several hundred volts, which may cause an electric shock accident if touched. Therefore, the secondary side of the current transformer is provided with a short-circuit switch to prevent the primary side from opening. During use, once the secondary side opens, the circuit load should be removed immediately, and then stopped. It can be reused after everything is processed.

(4) In order to meet the needs of measuring instruments, relay protection, breaker failure judgment and fault filtering, etc., in generators, transformers, outlets, busbar section breakers, busbar breakers, bypass breakers, etc. Set 2 to 8 secondary winding current transformers. For large current grounding systems, generally in three-phase configuration; for small current grounding systems, according to specific requirements in two-phase or three-phase configuration.

(5) The installation location of the protection current transformer should be set as far as possible to eliminate the area that the main protection device cannot protect. For example, if there are two sets of current transformers and the position is allowed, they should be placed on both sides of the circuit breaker to make the circuit breaker in the cross protection range.

(6) In order to prevent the busbar fault caused by the strut-type current transformer casing flashover, the current transformer is usually arranged on the outlet or transformer side of the circuit breaker.

(7) In order to reduce the damage during the internal fault of the generator, the current transformer for automatically adjusting the excitation device should be arranged on the outgoing side of the stator winding of the generator. In order to facilitate analysis and to find internal faults before the generator is incorporated into the system, the current transformer for the measuring instrument should be mounted on the neutral point of the generator.

The outdoor surfing device for the railway power supply system of the embodiment of the invention adopts a current transformer to realize the transformation of the grid current, and the isolation unit is used to realize the isolation of the circuit, and the isolation monitoring unit can realize the remote monitoring and control of the isolation unit, and Instant monitoring of current and voltage in the circuit; the above device can realize remote monitoring of the isolation unit and quick and accurate judgment of the location of the fault point of the contact network, thereby facilitating rapid maintenance of the fault of the contact network.

In view of the fact that the above-mentioned isolation unit is in contact with the power grid and is disposed on the support frame, which is inconvenient for the user to operate, in the actual implementation of the embodiment of the present invention, the isolation unit further includes an upper arm 106, a first transmission rod 107, and a transition which are sequentially connected. a bracket 108, a second transmission rod 109, a lower arm 110 and a control component (not shown); the upper arm is connected to the pull rod 111 of the isolating switch; the isolating switch comprises a body, a moving contact, a static contact and a pull rod; the movable contact is connected to the pull rod; the control member is disposed in the mechanism box.

The contact form of the movable contact and the static contact of the above isolating switch is a line contact. The switch blade and the terminal of the above-mentioned isolating switch are made of copper-plated silver, and the conductive knife of the above-mentioned isolating switch is made of pure copper.

The upper and lower arms are one of the commonly used components on mechanical equipment, and are connected to other components by screws to perform functions such as joint motion.

By providing the above-mentioned upper arm, the first transmission rod, the transition bracket, the second transmission rod, the lower arm and the control component, the control unit in the mechanism box can control the opening and closing of the isolation unit, which is convenient for the user to operate. ,control.

Further, the upper arm, the first transmission rod, the transition bracket, the second transmission rod and the lower arm of the above-mentioned isolation unit adopt a vertical push-pull type to drive and connect the isolating switch and the control component; wherein the movable contact of the isolating switch is Open up.

By using a vertical push-pull type to connect the isolating switch and the control component, the accuracy and convenience of the control component to the isolating switch can be improved.

In view of the need to control the above-described isolating switch in various ways, the above-mentioned control components include a manual opening and closing sub-part, an electric opening and closing sub-part, a remote control opening and closing sub-part, and a steering switch. The manual opening and closing sub-part, the electric opening and closing sub-part, and the remote control opening and closing sub-part are respectively connected to the lower arm by operating the changeover switch.

The opening and closing action of the isolating switch is completed by a control component disposed inside the mechanism box, and the opening and closing operations time is less than or equal to 4 seconds.

When the manual opening and closing sub-parts are used to control the opening and closing of the isolating switch, the operation steps are as follows: open the box door of the mechanism box, and drive the above-mentioned control switch to the position of the manual opening and closing sub-part, the locking plate exposes the handle Inserting the hole, inserting the handle, and closing by hand (setting the opening and closing direction sign on the operation panel); when the above-mentioned control switch is turned to the position of the electric opening and closing sub-part, the handle insertion hole is Blocked, manual operation cannot be performed.

When the electric opening and closing sub-parts are used to control the opening and closing of the isolating switch, the operation steps are as follows: the control unit is connected to the AC 220V power supply, and the above-mentioned control switching switch is turned to the position of the electric opening and closing sub-assembly, and when the opening is opened Press the opening button to make the motor turn on, and the torque is transmitted to the isolating switch through the mechanical device of the isolation unit for opening; the working step when closing is the same as the above opening step.

When the above-mentioned remote control opening and closing sub-assembly is used to control the opening and closing of the isolating switch, the operation steps are as follows: the user issues an operation instruction, and the above-mentioned isolation monitoring unit automatically completes the opening or closing process by controlling the above-mentioned control component, and The opening or closing circuit is disconnected; if there is a motor jam or the like during the closing or opening process, the remote control opening and closing sub-assembly can automatically disconnect the control circuit and the motor circuit.

A manpower branching and closing device for inspection and adjustment is provided in the above-mentioned mechanism box. The operation modes of the above-mentioned control switch include four modes of operation: "distal", "direct", "local" and "exit operation". The four operating modes are interlocked with each other, and the control switch is located at "far" and "out of operation". "The position can be locked. A motor protection device or an automatic air switch device is disposed in the above mechanism box. The above-mentioned mechanism box is also provided with a main circuit power supply voltage loss relay in the mechanism box, and can send a power failure power signal; the mechanism power input terminal in the mechanism box is not less than 10 mm ² , and the inlet terminal uses a cage spring type terminal block. To prevent loose wiring.

In addition, an indicator indicating the separation and closing position of the isolating switch is provided outside the mechanism box, and the indicator will give a signal when the above control unit fails. The box of the above-mentioned mechanism box is reliable in sealing, has dustproof and waterproof functions, and the protection grade is IP 55. The casing of the mechanism is made of stainless steel 304 material.

Through the above-mentioned various opening and closing sub-components, a plurality of ways to control the opening and closing of the isolating switch can be realized, and the above-mentioned various ways of switching can be realized by the above-mentioned manipulation switching switch.

In view of the need to monitor the above-mentioned isolation unit, in the actual implementation of the embodiment of the present invention, the isolation monitoring unit is connected with the manual opening and closing sub-part, the electric opening and closing sub-part, the remote control switching sub-part, and the monitoring isolation unit. . Real-time remote monitoring of the operation status of the isolated unit can be realized by the isolated monitoring unit.

Further, the above isolation monitoring unit includes the following parts:

An information collecting component, configured to collect information about an operating state of the isolation unit and a fault current and voltage of the contact network;

The communication component is electrically connected to the information collecting component, and is configured to send the operating state of the isolation unit collected by the information collecting component and the fault current and voltage information of the contact network to the remote device, and receive the remote device according to the running state. Control instruction;

The monitoring component is electrically connected to the communication component for controlling the remote control of the switching sub-assembly according to the control command.

Through the above information collecting component, the above communication component and the above monitoring component, remote monitoring and control of the isolation unit and real-time monitoring of current and voltage in the circuit can be realized.

In addition, the above-mentioned isolation monitoring unit (also referred to as a contact network isolation switch monitoring unit) can be used to monitor the contact network electric switch in the station or in the interval. The isolated monitoring unit adopts a modular architecture, has monitoring, control and communication functions, and can complete the control function of the switch and collect the running state of the switch in real time. The isolation monitoring unit is composed of an intelligent controller, an I/O board, a power supply unit, a backup power management unit, a fiber optic communication module, a control box, and the like, and exchanges information through the optical fiber communication and the communication management unit in the contact network switch control station.

The above-mentioned isolation monitoring unit also adopts photoelectric isolation measures, and adopts measures for preventing contact jitter interference in software and hardware; and the isolation monitoring unit adopts self-standing or wall-mounted structure and single-door structure, and has sufficient mechanical strength and resistance. Vibration capability to ensure no sloshing after installation, no deformation of equipment, and adapt to the operating environment of electrified railway. The above-mentioned isolation monitoring unit also has the functions of lightning protection and power supply overvoltage.

The main technical parameters of the above-mentioned isolation monitoring unit can be referred to as follows: the controller of the isolation monitoring unit can adopt a 16-bit central processing unit with a word length of not less than 40 MHz; the control of the isolation monitoring unit is correct. The rate is greater than or equal to 99.99%, and the signal correct rate is greater than or equal to 99.9%; the communication interface of the isolation monitoring unit includes: RS-232, RS-485, CAN-BUS and Ethernet, and the communication rate is 0 to 115.2Kbps adaptive. The optical fiber used in the isolation monitoring unit includes: a multimode fiber with a size of 62.5/125 μm or 50/125 μm and a single mode fiber with a size of 09/125 μm; the wavelength of the above multimode fiber is 850 nm or 1310 nm, and the above single mode fiber The wavelength is 1310 nm.

The above RS-232 interface complies with the interface standard for serial data communication established by the Electronic Industries Alliance (EIA). The original number is EIA-RS-232 (abbreviated as 232, RS232). The RS-232 is widely used for computer serial interface peripheral connections. In the RS-232 standard, characters are transmitted serially one after another in a serial bit string. The advantage is that the transmission line is small, the wiring is simple, and the transmission distance can be far. The most common encoding format is the asynchronous start-stop format, which uses a start bit followed by 7 or 8 data bits, then an optional parity bit, and finally one or Two stop bits. Therefore, sending a character requires at least 10 bits, and a good effect is to make the entire transmission rate, the rate of the transmitted signal, divided by 10. One of the most common alternatives to asynchronous start-stop is to use the Advanced Data Link Control Protocol (HDLC). Logic 1 and Logic 0 voltage levels are defined in the RS-232 standard, as well as standard transmission rates and connector types. The signal size is between positive and negative 3-15v. RS-232 specifies that the level close to 0 is invalid, and logic 1 specifies a negative level. The signal state of the effective negative level is called mark marking, its function meaning is OFF, logic 0 is specified as positive level, and effective positive power The flat signal state is called the space number spacing, and its functional meaning is ON. Levels of ±5, ±10, ±12, and ±15 are possible depending on the power supply of the device.

The above RS485 usually adopts differential signal negative logic, +2V to +6V means "0", and -6V~-2V means "1". The RS485 has two-wire and four-wire two-wire. The four-wire system can only realize the point-to-point communication method. Nowadays, the two-wire connection method is adopted. The wiring method is the bus topology on the same bus. Up to 32 nodes can be attached. In the RS485 communication network, the master-slave communication mode is generally adopted, that is, one host has multiple slaves. In many cases, when connecting an RS-485 communication link, simply connect the "A" and "B" ends of each interface with a pair of twisted pairs. While ignoring the connection of the signal ground, this connection method can work normally in many occasions, but it has buried a lot of hidden dangers for two reasons: (1) Common mode interference problem: RS-485 interface is adopted The signal transmission method in differential mode does not need to detect the signal relative to a certain reference point. The system only needs to detect the potential difference between the two lines. However, people often overlook that the transceiver has a certain common-mode voltage range. The common-mode voltage range of the RS-485 transceiver is -7~+12V. Only when the above conditions are met, the entire network can work normally. When the common mode voltage in the network line exceeds this range, it will affect the stability and reliability of the communication, and even damage the interface. (2) EMI problem: the common mode part of the transmit driver output signal needs a return path. If there is no low-resistance return channel (signal ground), it will return to the source end in the form of radiation, and the whole bus will be like a huge The antenna radiates electromagnetic waves outward.

The above CAN-BUS is also called CAN bus; among them, CAN is an abbreviation of Controller Area Network (hereinafter referred to as CAN), which is an international standard serial communication protocol of ISO. Since the types of data used for communication between different systems and the requirements for reliability are not the same, there are many cases in which a plurality of buses are formed, and the number of wire harnesses also increases. In order to meet the needs of "reducing the number of wire harnesses" and "high-speed communication of a large amount of data through a plurality of LANs", the CAN communication protocol has appeared and standardized. The above CAN belongs to the category of industrial field bus. Compared with the general communication bus, the data communication of the CAN bus has outstanding reliability, real-time and flexibility. Typical application protocols are: SAE J1939/ISO11783, CANOpen, CANaerospace, DeviceNet, NMEA 2000, etc. The CAN bus is connected to the physical bus through the two output terminals CANH and CANL of the CAN transceiver interface chip 82C250, and the state of the CANH terminal can only be a high level or a floating state, and the CANL terminal can only be a low level or a floating state. This guarantees that it will not appear in the RS-485 network, that is, when there is an error in the system, when multiple nodes send data to the bus at the same time, the bus is short-circuited, thereby damaging some nodes. Moreover, the CAN node has an automatic shutdown output function in the case of a serious error, so that the operation of other nodes on the bus is not affected, thereby ensuring that there is no problem in the network, and the bus is in a "deadlock" due to a problem with an individual node. status. Moreover, the perfect communication protocol of CAN can be realized by CAN controller chip and its interface chip, which greatly reduces the difficulty of system development, shortens the development cycle, and the performance is much better than RS-485 with only electrical protocol.

Optical fiber communication is a communication method in which light waves are used as information carriers and optical fibers are used as transmission media. The basic material elements that make up fiber optic communication are fiber optics, light sources, and photodetectors. In addition to classification according to manufacturing process, material composition and optical characteristics, optical fibers are often classified according to their applications, and can be classified into communication optical fibers and sensing optical fibers. The transmission medium fiber is divided into two types: general purpose and special purpose, and the functional device fiber refers to an optical fiber for performing functions of amplification, shaping, frequency division, frequency multiplication, modulation, and optical oscillation of light waves, and is often used for a certain functional device. The form appears. The principle of optical fiber communication is: at the transmitting end, the transmitted information (such as voice) is first converted into an electrical signal, and then modulated onto the laser beam emitted by the laser, so that the intensity of the light changes with the amplitude (frequency) of the electrical signal. And transmitted through the optical fiber; at the receiving end, the detector receives the optical signal and converts it into an electrical signal, and after demodulation, restores the original information.

In the embodiment of the present invention, the isolation monitoring unit further includes a backup power supply and a power management component; the power management component controls the backup in the case that the external power supply is powered off, in consideration of the fact that the isolation monitoring unit needs to continuously and continuously supply power. The power supply supplies power to the above isolated monitoring unit.

Wherein, the backup power source is an automatic driving quasi-power source for effectively preventing the driving circuit from having a normal voltage, and the voltage required by the circuit can be extended to provide a circuit capable of working normally; the backup power supply time is usually greater than or equal to 60. minute.

In view of the need to connect, support, and fix the various components described above, in the actual implementation of the embodiment of the present invention, the support frame includes a component base, an isolation switch bottom angle steel, an H-shaped steel column 101, a transition bracket angle steel, and a mechanism box fixed. An angle steel; the component base is connected to the isolation switch bottom angle steel; the isolation switch bottom angle steel is disposed on the top of the H-shaped steel column; the transition bracket angle steel is disposed in the middle of the H-shaped steel column body, and is connected with the transition bracket The above-mentioned mechanism box fixed angle steel is disposed at a lower portion of the above-mentioned H-shaped steel column body and connected to the mechanism box.

Wherein, for the above-mentioned isolating switch and the above current transformer, stainless steel bolts of the specification M16*55, 2 flat, 1 spring and 2 female are used, and are mounted and fixed on the above-mentioned component base; when mounting, the torsion force is 76N/M. For the above-mentioned component base, use stainless steel bolts of M16*55, 2 flat, 1 spring and 2 female, which are mounted and fixed on the top steel of the above-mentioned isolating switch; when installed, the torque used is 76N/M.

For the above-mentioned isolating switch bottom angle steel, the above transition bracket angle steel and the above-mentioned mechanism box fixed angle steel, the bolts of the specification M16X60, 2 flat, 1 spring and 2 female are installed and fixed on the above-mentioned H-shaped steel main body; the torsion force used during installation is used. It is 76N/M.

For the above-mentioned mechanism box, bolts of M16X60, 2 flat, 1 spring and 2 female are used, and are fixed and fixed on the fixed angle steel of the above-mentioned mechanism box; when installed, the torque used is 76N/M.

The above-mentioned H-shaped steel column is manufactured by a whole manufacturing method, and there is no transverse or oblique weld in the middle of the column. The H-shaped steel fixed length is preferably oxy-acetylene or plasma cut. The H-beam has a weld quality grade of two. The above H-shaped steel column should be integrally hot dip galvanized, and the H-shaped steel column must be corrected after hot dip galvanizing. The zinc deposit of the above H-shaped steel column shall not be less than 610 grams per square meter, that is, the thickness of any local zinc layer shall not be less than 86 μm.

The above-mentioned inspection of H-shaped steel columns includes pure bending test and bending moment test.

When performing the pure bending test, the H-shaped steel column is loaded to the standard test bending moment, the zinc layer of the H-shaped steel column is not peeled off, and is not convex; the H-shaped steel column is loaded to the guide height deflection test, the H-shaped steel The column test result conforms to the standard; when loading the H-shaped steel column to the top deflection test bending moment, the top deflection of the H-shaped steel column should be no more than 1.5L/100 (L is the height of the column); loading the H-shaped steel column When the bearing capacity test bending moment (the bearing capacity test bending moment is 150% of the standard test bending moment), the H-shaped steel column does not yield, the weld seam does not crack, the zinc layer does not peel off, and the cylinder does not produce drum plastic deformation.

When the bending moment test is performed, when the H-shaped steel column is loaded to the torque standard value, the torsion angle at the contact line height of the H-shaped steel column is less than or equal to 6°; loading the H-shaped steel column to the bearing capacity test bending moment (When the bearing capacity test bending moment is 150% of the standard test bending moment and torque standard value), the H-shaped steel column does not yield, the weld seam does not crack, the zinc layer does not peel off, and the cylinder does not produce drum plastic deformation.

The metal exposed portion of the body of the above-mentioned isolating switch and the component base and the metal components used for mounting are hot-dip galvanized or stainless steel, and the component base is preferably fabricated by integral molding.

The above-mentioned outdoor netting device for the railway power supply system adopts an epoxy resin full-sealing casting method, and the outer insulation is made of silicone rubber; the epoxy resin and the silicone rubber are both made of a flame-retardant self-extinguishing insulating material. When the above epoxy resin is cast, the coil is fixed by a bracket to ensure stability and accuracy.

In all of the examples shown and described herein, any specific values should be construed as merely exemplary, and not as a limitation, and thus, other examples of the exemplary embodiments may have different values.

Through the various parts of the above support frame, connection, support and fixing of the current transformer, the isolation unit, the isolation monitoring unit and the mechanism box can be realized.

Example 2

The embodiment of the invention further provides an outdoor internet access system for a railway power supply system, which system comprises an outdoor internet access device for a railway power supply system in the embodiment 1, and a contact network connected to the outdoor internet access device. And traction substation.

In order to meet the need to quickly determine the location of the fault point of the contact network, a device for automatically measuring the position of the fault point in the charged state can be set in the traction substation for the single and double-line contact network feeder, that is, the electrified railway contact network fault detecting device . The device determines the location of the fault point by calculating the distance of the fault point from the traction substation. Therefore, when a fault occurs in the upstream contact network A section of a traction substation, the distance determined by the contact network fault detection device from the traction substation should be in the A section, but the fault point direction cannot be determined. The determined location may also be in the B segment adjacent to the A segment but in the opposite direction. That is to say, the fault point position given by the fault point calibration device is a range, and it is necessary to manually determine the location of the fault point through the manual on-site inspection, which seriously affects the accident repair time and cannot meet the fast repair requirement. The isolation switch does not have any monitoring capability, and there is no other monitoring means on the contact network. There is a lack of contact with the network itself, the Internet isolation switch and the contact network fault detection device to determine the location of the fault point.

Therefore, when the outdoor internet access system for the railway power supply system is used in the embodiment of the present invention, since the internet module has the fault direction judgment function, it can satisfy the fast judgment of the fault point and the fast repair requirement.

Referring to FIG. 2, a flow chart of a method for controlling an access network on an outdoor Internet access system for a railway power supply system includes the following steps:

Step S202, the isolation monitoring unit collects information about the operating state of the isolation unit and the fault current and voltage of the contact network;

Step S204, the isolation monitoring unit sends the collected operating state and the fault current and voltage information to the remote device, so that the remote device locates the fault point according to the operating state and the fault current and voltage information, and issues a control command;

Step S206, the isolation monitoring unit controls the opening and closing of the isolation unit according to the control instruction.

The relative steps, numerical expressions and numerical values of the components and steps set forth in the examples are not intended to limit the scope of the invention.

In addition, the above-mentioned outdoor Internet access system for the railway power supply system determines the current direction through the relevant current component, thereby determining the direction of the fault point position, and further determining the fault point position by using the catenary fault detecting device provided by the traction substation, and the above method satisfies The precise positioning requirements of the contact network faults enable rapid judgment of the fault point and also meet the requirements for rapid repair.

The method for controlling the contact with the online network by the outdoor internet access system for the railway power supply system can realize the remote monitoring of the isolation unit and the quick and accurate judgment of the contact point of the contact network, thereby facilitating the rapid maintenance of the contact network failure.

The above contact network is one of the two power supply network modes commonly used in electrified railways, and the other power supply mode is the third rail power supply. The catenary is a special form of transmission line that is erected along the railway line and supplies power to the electric locomotive. The contact net is composed of a contact suspension, a support device, a positioning device, a pillar and a foundation.

The contact suspensions described above include contact wires, suspension strings, load-bearing cables, and connecting parts and insulators. The contact suspension is erected on the support by a support device for delivering electrical energy obtained from the traction substation to the electric locomotive.

The support device described above is used to support the contact suspension and transfer its own load to the strut or other building. The structure of the support device varies according to the area where the contact net is located, the station yard and the large building, and mainly includes wrist arms, horizontal tie rods, suspension insulator strings, rod insulators and other special support equipment for buildings.

The positioning device comprises a positioning tube and a positioner for fixing the position of the contact line, so that the contact line is within the running track of the pantograph slide, and ensuring that the contact line and the pantograph are not separated, and the horizontal load of the contact line is transmitted. Give the pillars.

The struts and foundations described above are used to withstand the full load of the contact suspension, support and positioning devices and to secure the contact suspension to a defined position and height. The contact nets are mostly made of prestressed reinforced concrete pillars and steel columns; the foundation is for the steel pillars, that is, the steel pillars are fixed on the basis of the reinforced concrete below; the foundation bears all the loads transmitted by the pillars and ensures the stability of the pillars. Sex. The prestressed reinforced concrete struts are made in one piece with the foundation and the lower end is directly buried in the ground.

The voltage level of the above contact net is: 25KV to 30KV (for ground) single-phase power frequency AC, the voltage of the electric locomotive is: 25KV; considering the voltage loss, the output voltage of the traction substation is: 27.5KV or 55KV, of which 55KV is the AT power supply mode, mainly used in high-speed electrified railways. The contact network voltage of urban rail transit is generally 750V or 1500V DC.

At present, the classification of contact nets is mostly distinguished by the type of contact suspension. According to the structure, it is divided into two types: simple contact suspension and chain contact suspension.

The above simple contact suspension (hereinafter simply referred to as a simple suspension) is a suspension form in which a contact line is directly fixed to the pillar supporting device. The elastic simple suspension with compensating device is equipped with a tension compensating device at the anchor below the contact line to adjust the change of tension and sag. An elastic sling of 8m to 16m length is attached to the suspension point, and the contact line is suspended by the elastic sling, which reduces the hard point generated at the suspension point and improves the flow taking condition. By appropriately reducing the span, the tension of the contact line can be increased, thereby improving the effect of the sag on the flow.

The contact line of the chain suspension described above is suspended from the load line by a hanging string. The load-bearing cable is suspended from the support device of the pillar, so that the contact line increases the suspension point without increasing the pillar, and the length of the suspension string is adjusted so that the distance of the contact line to the rail surface is uniform throughout the span. The chain suspension reduces the sag of the contact line in the middle of the span, improves the elasticity, increases the suspension weight, improves the stability, and can meet the requirements of the high-speed running of the electric locomotive.

The above chain suspension has better performance than the above simple suspension, but also brings many problems such as complicated structure, high cost, large construction and maintenance tasks, and the like. The above-mentioned chain suspension classification methods are many, and can be divided into single chain shape, double chain shape and multi chain shape (also called triple chain shape) according to the number of hanging chains. The chain suspension can be divided into an uncompensated chain suspension, a semi-compensated chain suspension, and a fully compensated chain suspension according to the anchoring mode of the clues (ie, the way the anchors are anchored at both ends of the clue).

The above-mentioned traction substation is a dedicated substation for electric traction. The electric power sent by the traction substation to the regional power system is converted into electric energy suitable for electric traction according to the different requirements of electric traction for current and voltage, and then respectively sent to the contact network erected along the railway line, which is an electric locomotive. Power supply, or power supply system for urban transportation such as underground railways, to supply electric vehicles or trams for subways. A plurality of traction substations are arranged along an electrified railway, and the distance between adjacent substations is about 40 to 50 kilometers. In the long electrified railway, in order to segment the high-voltage transmission line to narrow the fault range, there is usually a strut traction substation every 200-250 km. In addition to the functions of the general substation, the high-voltage power grid is also installed. The incoming power is distributed to other intermediate substations through its bus and power lines.

The main power equipment of the above-mentioned traction substation is a step-down transformer with a single unit capacity of 10000 kVA or more, which is called a main transformer or a traction transformer. Most of the industrial and mining and urban traffic are drawn by DC power. Therefore, in addition to the step-down transformer, there are also semiconductor rectifiers that convert AC power into DC power. In addition, various types of traction substations include main circuit breakers for switching on and off power circuits, isolating switches for maintenance and safety, and automatic control systems and power-offs for automatic, remote control and protection. Protection System.

The above-mentioned traction transformers are generally classified into two types, DC and AC. The function of the DC traction substation is to step down and rectify the high voltage power of the regional power grid to make it 1500 volts, 750 volts or 600 volts for urban traffic, and then send it to the catenary for DC electric locomotives or electric vehicles. powered by. AC traction substation is divided into three-phase traction substation, single-phase traction substation and three-phase-two-phase traction substation according to different traction transformer winding wiring.

The primary winding of the transformer of the above three-phase traction substation is usually a star connection, and the secondary winding is a delta connection. One connection point of the triangle is connected to the railway track, and the other two connection points are respectively connected to the power supply section contact net on the left and right sides of the traction substation. Since the phase difference between the two sides is 60°, segmentation is required. The advantage of the three-phase traction substation is that the secondary side of the transformer maintains three phases, which can be used for the three-phase power of the substation itself and the place; the disadvantage is that the capacity of the transformer is not fully utilized.

The above single-phase traction substation uses 1 to 2 single-phase transformers. When a single-phase transformer is used, one end of the secondary winding is connected to the track, and the other end is simultaneously supplied to the power supply section contact net on the left and right sides. For ease of maintenance, the two power supply zones are separated by relevant segments. If two single-phase transformers are used, the primary windings are respectively connected to two different busbars of the high-voltage three-phase bus, so that the three-phase load is balanced; the two secondary windings are connected by V-shaped, common points are connected to the track, and the rest Both ends supply power to the partitions on both sides, and use related segments. The advantage of single-phase substation is that the transformer capacity is fully utilized. However, the regional load requires a dedicated transformer; simple single-phase wiring also affects the balance of the three-phase system.

The primary winding of the transformer of the above three-phase-two-phase traction substation is connected into a T-shape and connected with the three-phase high-voltage busbar; the secondary side is connected by two phases, the common terminal is connected to the track, and the other ends are respectively connected to the power supply zone, since both The phase difference is 90°, and the two partitions also need to be separated. This form of traction substation overcomes the shortcomings of three-phase and single-phase traction substations to some extent.

The traction power supply circuit is a closed circuit composed of a traction substation--feeder--contact network--electric locomotive--rail--reflow connection--(traction substation) grounding network, in which the current flowing is called traction current Closing or disconnecting the traction supply circuit creates a strong arc, which can have serious consequences if not handled properly. The catenary, rail circuits (including the earth), feeders, and return lines are commonly referred to as traction nets.

It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. The orientation or positional relationship of the indications is based on the orientation or positional relationship shown in the drawings, and is merely for the convenience of the description of the invention and the simplified description, rather than indicating or implying that the device or component referred to has a specific orientation, in a specific orientation. The construction and operation are therefore not to be construed as limiting the invention. Moreover, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In addition, in the description of the present invention, the terms "installation", "connected", and "connected" are to be understood broadly, and may be, for example, a fixed connection or a detachable connection, or Connected integrally; can be mechanical or electrical; can be directly connected or indirectly connected through an intermediate medium, which can be the internal communication between the two components. The specific meaning of the above terms in the present invention can be understood in a specific case by those skilled in the art.

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

An outdoor internet access device for a railway power supply system, characterized in that the device comprises an internet main body module and an internet peripheral module;

The Internet main body module includes: a current transformer, an isolation unit, and an isolation monitoring unit; the Internet peripheral module includes a support frame; and the isolation unit includes an isolation switch and a mechanism box;

The first terminal of the current transformer is connected to the contact net; the second terminal of the current transformer is provided with a static contact of the isolating switch;

a first terminal of the body of the isolating switch is connected to a power supply line of a traction substation, and a second terminal of the body of the isolating switch is provided with a moving contact of the isolating switch, and a movable contact of the isolating switch The static contact of the isolating switch is fitted;

The isolation monitoring unit is disposed in the mechanism box and electrically connected to the isolation unit;

The current transformer, the isolating switch and the mechanism box are all disposed on the support frame.
The device according to claim 1, wherein the isolation unit further comprises an upper arm, a first transmission rod, a transition bracket, a second transmission rod, a lower arm and a control component that are sequentially connected;

The upper arm is connected to the pull rod of the isolating switch;

The isolating switch includes the body, the movable contact, the static contact and the pull rod; the movable contact is connected with the pull rod;

The control component is disposed in the mechanism box.
The device according to claim 2, wherein said upper arm, said first transmission rod, said transition bracket, said second transmission rod, said lower arm are vertically push-pull The isolating switch and the control component are drivingly connected; wherein the movable contact of the isolating switch is in an upward opening manner.
The apparatus according to claim 2, wherein said control means comprises a manual opening and closing sub-part, an electric opening and closing sub-part, a remote control opening and closing sub-part, and a manipulation changeover switch;

The manual opening and closing sub-part, the electric opening and closing sub-part, and the remote control opening and closing sub-assembly are respectively connected to the lower arm by operating a changeover switch.
The apparatus according to claim 4, wherein said isolation monitoring unit is connected to said manual opening and closing sub-assembly, said electric opening and closing sub-assembly, said remote control opening and closing sub-assembly, and monitoring The isolation unit.
The device according to claim 5, wherein the isolation monitoring unit comprises:

An information collecting component, configured to collect information about an operating state of the isolation unit and a fault current and voltage of the contact network;

a communication component, configured to send information about an operating state of the isolation unit and the fault current and voltage of the contact network collected by the information collecting component to a remote device, and receive the remote device according to the operating state Control instructions issued;

And a monitoring component, configured to control the remote control switching sub-assembly according to the control instruction.
The device according to claim 1, wherein the isolation monitoring unit further comprises a backup power source and a power management component; wherein the power management component controls the backup power supply to supply power to the isolation monitoring unit when the external power source is powered off. .
The device according to claim 1, wherein the support frame comprises a component base, an isolation switch bottom angle steel, an H-shaped steel column, a transition bracket angle steel, and a mechanism box fixed angle steel;

The component base is connected to the isolation switch bottom angle steel; the isolation switch bottom angle steel is disposed at the top of the H-shaped steel column; the transition bracket angle steel is disposed at a middle portion of the H-shaped steel column column, and the The transition bracket is connected; the fixed angle steel of the mechanism box is disposed at a lower portion of the column of the H-shaped steel column, and is connected to the mechanism box.
An outdoor internet access system for a railway power supply system, comprising the outdoor internet access device of any one of claims 1 to 8, further comprising the contact net connected to the outdoor internet access device and the Traction substation.
A method for controlling a contact network according to the system of claim 9 is characterized in that it comprises:

The isolation monitoring unit collects information about an operating state of the isolation unit and a fault current and voltage of the contact network;

The isolation monitoring unit transmits the collected information of the operating state and the fault current and voltage to the remote device, so that the remote device locates the fault point according to the operating state and the information of the fault current and voltage, and Send control instructions;

The isolation monitoring unit controls the opening and closing of the isolation unit according to the control instruction.