CN108075453A - A kind of middling speed magnetic-suspension tractive power supply protection system to earth - Google Patents
A kind of middling speed magnetic-suspension tractive power supply protection system to earth Download PDFInfo
- Publication number
- CN108075453A CN108075453A CN201810025181.1A CN201810025181A CN108075453A CN 108075453 A CN108075453 A CN 108075453A CN 201810025181 A CN201810025181 A CN 201810025181A CN 108075453 A CN108075453 A CN 108075453A
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- China
- Prior art keywords
- power supply
- breaker
- traction
- line
- contact line
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- Train Traffic Observation, Control, And Security (AREA)
Abstract
The present invention discloses a kind of middling speed magnetic-suspension tractive power supply protection system to earth, including train frame ground brush, device in one-way on state, traction DC power supply, feeder breaker, train frame, anode contact line, line-breaker and cathode contact line；Anode contact line is accessed in described feeder breaker one end, and the other end is connected with the traction DC power supply；The other end access cathode contact line of the traction DC power supply；Train frame ground brush is equipped on the outside of the train frame.The selectivity tripping of the achievable ground short circuit failure of the present invention avoids multiple traction institutes feeder breaker from tripping simultaneously, solves the problems, such as that the more traction substations of low speed magnetic floating earth fault trip simultaneously.
Description
Technical field
The invention belongs to technical field of rail traffic, more particularly to a kind of middling speed magnetic-suspension tractive power supply protection system to earth.
Background technology
Medium-and low-speed maglev track traffic refers to maximum speed for 120km/h magnetic levitation track traffic, middling speed magnetic levitation track traffic
It is 160km/h magnetic levitation track traffic to refer to maximum speed.
Medium-and low-speed maglev track traffic uses direct-current traction power supply standard, and Traction networks system is connect by anode conductor rail and cathode
Rail-engaging forms, and positive and negative electrode conductor rail is distributed in the both sides of track, and positive and negative electrode conductor rail insulate with ground；By anode conductor rail to
Vehicle power supply, the reflux of cathode contact rail.Traction substation DC feeder cabinet uses breaker cabinet, for the short of DC traction feeder line
Road failure and misoperation, breaker cabinet are provided with the direct trip protection of high current circuit breaker, overcurrent protection, electric current and become
Rate and its increment protection, two-sided anti-interference protection etc..
Not only anode conductor rail, cathode contact rail and ground insulate for medium-and low-speed maglev track traffic, and vehicle body is also exhausted with ground
Edge.When train is run in section, when insulation fault between anode and vehicle housing occurs, since vehicle and passenger are equipotentials
Human electric shock's accident will not occur for body；But after train enters the station, due to there is voltage difference between vehicle and ground, work as passenger getting on/off
When there are step voltages, it is easy to electric shock accidents occurs.The safety of passenger after entering the station in order to ensure train, all stations are all set
Earth orbit is put, earth orbit is connected with earth mat.After train enters station, rail vehicle shell is connected by contactor with earth orbit
It touches, car body reliable ground when enabling train arrival.
Due to the design feature of medium-and low-speed maglev orbit traffic direct current tractive power supply system, anode directly occurs cathode short
The possibility of road failure is smaller, and the possibility that earth fault occurs over the ground for positive or negative pole increases.Earth fault principal mode
Have anode conductor rail over the ground (bridge), train anode circuit and train frame (), DC equipment is grounded in electric substation.In order to
Ground fault condition can find and protect in time system, and medium-and low-speed maglev orbit traffic direct current tractive power supply system takes
Voltage relay earth protective device (abbreviation 64D) is set between cathode and ground.
Be provided with since each traction substation is provided with 64D protective devices, in 64D protective devices counter-current diode,
Ground resistance, voltage sensor, current sensor, power supply and Control System of Microcomputer composition.Protection start voltage can 90~
Setting, is usually set to 200V in 300V.When anode contact line earth fault occurs, each traction substation generates short circuit
Electric current, short circuit current flow flow through each traction substation 64D by Through ground wire, cause multiple traction substation 64D protective devices
It detects failure and starts feeder breaker tripping.But when earth fault occurs, earth short circuit current passes through each traction substation
64D devices, adjacent multiple traction substations can and trip, occur on a large scale power failure.
Medium-and low-speed maglev orbit traffic direct current tractive power supply system conductor rail is mounted on bridge both sides, and conductor rail passes through insulation
Son insulate with pier, and ground wire is had no through between pier.When conductor rail insulator damages, conductor rail voltage directly adds
Onto pier, current leakage is formed.Under this fault condition, 64D protective devices can't detect voltage drop, can not realize
Protection forms security risk.
Main cause is that ground resistance is provided in 64D protective devices, a ground resistance quantity bigger than line resistance
Grade causes a section that ground short circuit occurs, and it is much bigger therefore adjacent multiple that ground resistance powers on pressure drop ratio line resistance pressure drop
Traction 64D protective devices can detect voltage more than setting value.
When conductor rail insulator damages, conductor rail voltage is applied directly on pier, forms current leakage.Leakage current
There is no metal pathway, 64D protective devices are monitored less than leakage current, will not start alarm, more will not starting tripping.
The content of the invention
The present invention provides a kind of middling speed magnetic-suspension tractive power supply ground protection system for technical problem in the prior art
System avoids multiple traction institutes feeder breaker from tripping simultaneously, solves low speed magnetic, it can be achieved that the selectivity tripping of ground short circuit failure
The problem of more traction substations of suspension joint earth fault trip simultaneously.
In order to solve the above technical problems, the technological system that the present invention uses is：A kind of middling speed magnetic-suspension tractive is protected for electrical ground
Protecting system, including train frame ground brush, device in one-way on state, traction DC power supply, feeder breaker, train frame, anode
Contact line, line-breaker and cathode contact line；
Anode contact line is accessed in described feeder breaker one end, and the other end is connected with the traction DC power supply；It is described to lead
Draw the other end access cathode contact line of DC power supply；Train frame ground brush is equipped on the outside of the train frame；The train
Frame is internally provided with line-breaker；One end access anode contact line of the line-breaker, the line-breaker
The other end accesses cathode contact line.
Preferably, being additionally provided with motor, resistance and one-way conduction device in the train frame, the line broken circuit is accessed
Circuit where device.
Preferably, Through ground wire is set in positive and negative anodes conductor rail installation side, the Through ground wire and traction substation
Ground connection busbar is connected.
Preferably, access is equipped with device in one-way on state between the cathode contact line and the Through ground wire.
Compared with prior art, advantageous effect possessed by the present invention is：The present invention can be grounded short trouble
Selectivity tripping avoids multiple traction institutes feeder breaker from tripping simultaneously.Solve the more traction substations of low speed magnetic floating earth fault
The problem of tripping simultaneously.
Description of the drawings
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the structure diagram of the prior art.
1- Through ground wires in figure, 2- train frame ground brushes, 3- device in one-way on state, 4- traction DC power supplies, 5- feeder lines
Breaker, 6- train frames, 7- anode contact lines, 8- line-breakers, 9- cathode contact lines.
Specific embodiment
For those skilled in the art is made to be better understood from the technological system of the present invention, in the following with reference to the drawings and specific embodiments
It elaborates to the present invention.
Embodiment of the invention discloses that a kind of middling speed magnetic-suspension tractive power supply protection system to earth, as shown in the figure, it includes
Train frame ground brush 2, device in one-way on state 3, traction DC power supply 4, feeder breaker 5, train frame 6, anode contact line
7th, line-breaker 8 and cathode contact line 9；
5 one end of feeder breaker access anode contact line 7, the other end is connected with traction DC power supply 4；Draw DC power supply
4 other end access cathode contact line 9；6 outside of train frame is equipped with train frame ground brush 2；Train frame 6 is internally provided with
Line-breaker 8；One end access anode contact line 7 of line-breaker 8, the other end access cathode contact of line-breaker 8
Line 9.
In the present embodiment, motor, resistance and one-way conduction device, equal 8 institute of line attachment breaker are additionally provided in train frame 6
In circuit.
In the present embodiment, Through ground wire 1, Through ground wire 1 and traction substation are set in positive and negative anodes conductor rail installation side
Ground connection busbar is connected.
In the present embodiment, access is equipped with device in one-way on state 3 between cathode contact line 9 and Through ground wire 1.
In the present embodiment, the one-way conduction that 64D protective devices of the prior art are changed to bear to big short circuit current flow fills
It puts, voltage detecting is changed to current detecting, and the ground wire being open to traffic in anode and the setting of cathode contact rail mounting seat.
Short circuit current flow is as the foundation for judging startup feeder breaker tripping.
In the present embodiment, when anode contact line is grounded, earth short circuit current passes through Through ground wire and device in one-way on state
Cathode is flowed back to, feeder breaker KB detects high current (more than 9000A), starts feeder breaker action tripping.Due to this time
Be not provided with ground resistance in road, near-end short circuit current flow can reach 30000A and more than, even if between in the line, anode is over the ground
Short circuit current flow can also reach 18000A.Also reach with the measured short circuit current flow of another traction in section in 12000A, and it is remote
Traction institute short circuit current flow from short-circuit section is much smaller than 9000A.Device in one-way on state and Through ground wire are set, can be realized by electricity
Stream detection is as the foundation judged, and the protected mode that traction substation is set is constant：(a) high current circuit breaker is directly jumped
Lock is protected；(b) overcurrent protection；(c) current changing rate and its increment protection (di/dt+ Δ I)；(d) two-sided anti-interference is protected；(e)
The automatic reclosing that tape jam property judges.
The present invention is described in detail above by embodiment, but the content is only the exemplary implementation of the present invention
Example, it is impossible to be construed as limiting the practical range of the present invention.Protection scope of the present invention is defined by the claims.All utilizations
Technological system of the present invention or those skilled in the art are under the inspiration of the technology of the present invention system, in the reality of the present invention
In matter and protection domain, design similar technological system and reach above-mentioned technique effect or that application range is made
All the changes and improvements etc., the patent that should all still belong to the present invention cover within protection domain.
Claims (4)
- The protection system to earth 1. a kind of middling speed magnetic-suspension tractive is powered, which is characterized in that including train frame ground brush, one-way conduction Device, traction DC power supply, feeder breaker, train frame, anode contact line, line-breaker and cathode contact line；Anode contact line is accessed in described feeder breaker one end, and the other end is connected with the traction DC power supply；The traction is straight The other end access cathode contact line in galvanic electricity source；Train frame ground brush is equipped on the outside of the train frame；The train frame Be internally provided with line-breaker；The line-breaker one end access anode contact line, the line-breaker it is another It terminates into cathode contact line.
- A kind of 2. middling speed magnetic-suspension tractive power supply protection system to earth according to claim 1, which is characterized in that the train Motor, resistance and one-way conduction device are additionally provided in frame, accesses circuit where the line-breaker.
- 3. a kind of middling speed magnetic-suspension tractive power supply protection system to earth according to claim 1, which is characterized in that in positive and negative anodes Conductor rail installation side sets Through ground wire, and the Through ground wire is connected with the ground connection busbar of traction substation.
- A kind of 4. middling speed magnetic-suspension tractive power supply protection system to earth according to claim 1, which is characterized in that the cathode Access is equipped with device in one-way on state between contact line and the Through ground wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810025181.1A CN108075453A (en) | 2018-01-11 | 2018-01-11 | A kind of middling speed magnetic-suspension tractive power supply protection system to earth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810025181.1A CN108075453A (en) | 2018-01-11 | 2018-01-11 | A kind of middling speed magnetic-suspension tractive power supply protection system to earth |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108075453A true CN108075453A (en) | 2018-05-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810025181.1A Pending CN108075453A (en) | 2018-01-11 | 2018-01-11 | A kind of middling speed magnetic-suspension tractive power supply protection system to earth |
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| CN (1) | CN108075453A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110912087A (en) * | 2019-11-14 | 2020-03-24 | 中铁第四勘察设计院集团有限公司 | Grounding conduction device and direct-current traction power supply system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102126445A (en) * | 2011-01-25 | 2011-07-20 | 中国人民解放军国防科学技术大学 | Grounding and protecting method for medium-low speed maglev train |
| CN205283088U (en) * | 2015-12-31 | 2016-06-01 | 中铁第四勘察设计院集团有限公司 | A direct current ground protecting device for magnetic levitation track traffic |
| CN205986095U (en) * | 2016-08-25 | 2017-02-22 | 镇江大全赛雪龙牵引电气有限公司 | Earth fault protection system of track traffic DC traction system |
| CN106992496A (en) * | 2017-05-26 | 2017-07-28 | 湘潭市恒创电气设备有限公司 | Earth leakage protecting method for Feeding System of Urban Rail Transit |
-
2018
- 2018-01-11 CN CN201810025181.1A patent/CN108075453A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102126445A (en) * | 2011-01-25 | 2011-07-20 | 中国人民解放军国防科学技术大学 | Grounding and protecting method for medium-low speed maglev train |
| CN205283088U (en) * | 2015-12-31 | 2016-06-01 | 中铁第四勘察设计院集团有限公司 | A direct current ground protecting device for magnetic levitation track traffic |
| CN205986095U (en) * | 2016-08-25 | 2017-02-22 | 镇江大全赛雪龙牵引电气有限公司 | Earth fault protection system of track traffic DC traction system |
| CN106992496A (en) * | 2017-05-26 | 2017-07-28 | 湘潭市恒创电气设备有限公司 | Earth leakage protecting method for Feeding System of Urban Rail Transit |
Non-Patent Citations (2)
| Title |
|---|
| 张斌等: "城市轨道交通直流牵引系统接地保护问题探讨", 《河南科技》 * |
| 高勇: "城市轨道交通直流牵引供电系统接地方案的研究", 《优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110912087A (en) * | 2019-11-14 | 2020-03-24 | 中铁第四勘察设计院集团有限公司 | Grounding conduction device and direct-current traction power supply system |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180525 |
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| RJ01 | Rejection of invention patent application after publication |