CN109109679A - A kind of rail traffic special rail reflux power supply system - Google Patents
A kind of rail traffic special rail reflux power supply system Download PDFInfo
- Publication number
- CN109109679A CN109109679A CN201710544699.1A CN201710544699A CN109109679A CN 109109679 A CN109109679 A CN 109109679A CN 201710544699 A CN201710544699 A CN 201710544699A CN 109109679 A CN109109679 A CN 109109679A
- Authority
- CN
- China
- Prior art keywords
- rail
- traction networks
- traction
- cathode
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010992 reflux Methods 0.000 title abstract description 13
- 230000006837 decompression Effects 0.000 claims abstract description 16
- 230000005611 electricity Effects 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000011218 segmentation Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Train Traffic Observation, Control, And Security (AREA)
Abstract
The present invention discloses a kind of rail traffic special rail reflux power supply system, including aerial earth wire, Traction networks anode, Traction networks cathode, rail, ground connection busbar, traction institute and decompression institute；The Traction networks anode is equipped with contact net；The Traction networks cathode is equipped with dedicated return current rail；It is described to draw accessed Traction networks anode and Traction networks cathode；The stepdown substation accesses Traction networks cathode.The present invention, which can reach, is greatly reduced DC stray current, caused by avoiding the problem that because of stray electrical current inside and out rail traffic, can farthest guarantee the safety of passenger and operation personnel and reduce the beneficial effect of engineering construction difficulty.
Description
Technical field
The invention belongs to technical field of rail traffic, in particular to a kind of rail traffic special rail reflux power supply system.
Background technique
With the fast development of urban track traffic, the city rail traffic route that the country builds up operation is more and more, perhaps
Planning and establishing urban track traffic in more boom towns.Most domestic urban track traffic is all made of anode and connects
It touches net or conductor rail power supply, cathode is by way of rail return current, as shown in fig. 7, being asked under the reflux type there are following
Topic:
By construct, the various aspects factor such as environmental condition is influenced, having opened the rail of route, transition resistance value is much over the ground
Lower than the 15 Ω km of design requirement (through counting, universal numerical value is in 0.8-3 Ω km).So in DC traction power-supply system
In, traction current and it is not all flow back to traction substation from rail, but some leaks to railway roadbed by rail, and by
The metal pipe lines such as railway roadbed flow direction structure reinforcing bar and along the line water pipe, oil-gas pipeline, these leakage current long-term existence have concealment
And it is uncertain, it will cause structure reinforcing bars and the along the line corrosion of pipeline, there is larger security risk.
Currently, Chongqing uses 4 rail power supply systems, traction power supply anode, cathode are all made of identical insulation water over the ground
It is flat, the problem of which is able to solve stray electrical current, but which has the following problems:
When mode anode fault to ground, due to the presence of resistance in 64D, short circuit current is smaller, and protection for feed line is difficult to standard
Really judge failure, and the measurement of 64D voltage is equally difficult to differentiate between fault section, thus make the selectivity of entire relay protection compared with
Difference.
Summary of the invention
The present invention for the technical problems in the prior art, provides a kind of rail traffic special rail reflux power supply system
Formula can reach and DC stray current is greatly reduced, can caused by avoiding the problem that because of stray electrical current inside and out rail traffic
Farthest guarantee the safety of passenger and operation personnel and reduces the beneficial effect of engineering construction difficulty.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of rail traffic special rail reflux power supply
Standard, including traction institute, decompression institute, aerial earth wire, Traction networks anode, Traction networks cathode, rail and ground connection busbar,
The Traction networks anode is equipped with contact net；The contact net includes downlink contact net and upcoming contact net；It is described to lead
Draw net cathode equipped with dedicated return current rail；The traction institute and the decompression access Traction networks anode and Traction networks cathode.
Preferably, the Traction networks anode is powered using overhead contact line mode to vehicle；The Traction networks anode exists
Traction is locating to be equipped with electricity segmentation, and Traction networks anode is divided into different traction power supply subregions.
Preferably, the Traction networks cathode is powered by return current rail to vehicle, the Traction networks cathode passes through special rail
Reflux.
Preferably, the rail is open to traffic, carried out by cable and aerial earth wire in parallel；The rail is in vehicle
Place's access of standing is grounded busbar.
Preferably, the traction institute and the be equipped with return current rail of decompression are grounded cabinet；The be equipped with negative ground of traction
One-way conduction cabinet；The return current rail ground connection cabinet and negative ground one-way conduction cabinet are connected between Traction networks cathode and ground connection busbar.
Preferably, being equipped with current measurement warning circuit and diode inside the negative ground one-way conduction cabinet.
It does not set resistance preferably, having inside the negative ground one-way conduction cabinet and sets two kinds of sides of resistance less than 200 milliohms
Formula.
It does not set disconnecting switch preferably, having inside the negative ground one-way conduction cabinet and sets disconnecting switch two ways.
Preferably, the negative ground one-way conduction cabinet and cathode rail ground connection cabinet can be substituted by side rail wear.
Compared with prior art, the present invention has the beneficial effects that
1, anode is using domestic common overhead contact line mode at present, and cathode is used powers similar installation side with three rails
Formula can utilize the space of current track traffic subterranean tunnel to greatest extent, make civil engineering, limit, vehicle compared to conventional rails
The change amount of travel pattern minimizes.
2, cathode uses the identical dielectric level with anode, and DC stray current can be greatly reduced, avoid because of stray electrical current
The problem of inside and out caused rail traffic, such as due to stray electrical current to tunnel structure corrode and reducing civil engineering structure makes
With service life and stray electrical current the corrosion of pipeline along rail traffic, building reduced along pipeline, building use the longevity
Life.
3, rail is penetrated through and is grounded, and can farthest guarantee the safety of passenger and operation personnel, and can increase traction
The spacing of electric substation reduces the quantity of traction substation, and then reduces engineering construction difficulty.
4, it is connected between ground connection busbar and cathode in traction substation setting negative ground one-way conduction cabinet, when route or vehicle
When negative insulation destroys, which can detect and alarm；When positive shorted to earth failure occurs, by the reflux of the device,
Big short circuit current can be achieved, to make DC feeder circuit breaker trip, make the relay protection of whole system that there is good choosing
Selecting property and sensitivity；When there is section failure, when needing to limit the potential difference between dedicated return current rail and rail, reflux can be passed through
Rail is grounded the contactor inside cabinet and realizes.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is contact net stepwise schematic views of the invention；
Fig. 3 is the wiring schematic diagram of negative ground one-way conduction cabinet of the invention；
Fig. 4 is the wiring schematic diagram that return current rail of the invention is grounded cabinet；
Fig. 5 is the structural schematic diagram of the 3rd embodiment of the invention；
Fig. 6 is the wiring schematic diagram of the negative ground one-way conduction cabinet of the 2nd embodiment of the invention；
Fig. 7 is background technique schematic diagram.
Drawing reference numeral: 1- draws institute, and 2- is depressured institute, and 3- aerial earth wire, 4- Traction networks are positive, and 5- Traction networks cathode, 6- is walked
Row rail, 7- are grounded busbar, and 8- return current rail is grounded cabinet, 9- negative ground one-way conduction cabinet, 91- disconnecting switch, 92- current measurement alarm electricity
Road, 93- diode, 94- resistance, 101- downlink contact net, 102- upcoming contact net, 11- rail potential limiting device.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, in the following with reference to the drawings and specific embodiments
It elaborates to the present invention.
Embodiment 1:
A kind of rail traffic special rail reflux power supply system, as shown in Figure 1, including traction institute 1, decompression 2, aerial earth wire
3, Traction networks anode 4, Traction networks cathode 5, rail 6 and ground connection busbar 7,
Aerial earth wire 3, Traction networks anode 4, Traction networks cathode 5, rail 6 and ground connection busbar 7 are arranged successively from high to low；
Traction networks anode 4 is equipped with contact net；Contact net includes downlink contact net 101 and upcoming contact net 102；Traction networks cathode 5 is equipped with
Return current rail；Traction institute 1 and decompression institute 2 access Traction networks anode 4 and Traction networks cathode 5.
In embodiment, Traction networks anode 4 is powered using overhead contact line mode to vehicle；Traction networks anode 4 is in traction institute 1
Place is equipped with electricity segmentation, and Traction networks anode 4 is divided into different traction power supply subregions.
In embodiment, Traction networks cathode 5 is powered by return current rail to vehicle, and Traction networks cathode 5 is flowed back by special rail.
In embodiment, rail 6 is open to traffic, and carries out parallel connection by cable and aerial earth wire 3；Rail 6 is located AT STATION
Access ground connection busbar 7.
In embodiment, traction institute 1 and decompression institute 2 are equipped with return current rail ground connection cabinet 8；Traction institute 1 is equipped with negative ground one-way conduction
Cabinet 9；Return current rail ground connection cabinet 8 and negative ground one-way conduction cabinet 9 are connected between Traction networks cathode 5 and ground connection busbar 7.
In embodiment, disconnecting switch 91, current measurement warning circuit 92 and diode are equipped with inside negative ground one-way conduction cabinet 9
93。
Embodiment 2:
A kind of rail traffic special rail reflux power supply system, including traction institute 1, decompression institute 2, aerial earth wire 3, Traction networks are just
Pole 4, Traction networks cathode 5, rail 6 and ground connection busbar 7,
Aerial earth wire 3, Traction networks anode 4, Traction networks cathode 5, rail 6 and ground connection busbar 7 are arranged successively from high to low；
Traction networks anode 4 is equipped with contact net；Contact net includes downlink contact net 101 and upcoming contact net 102；Traction networks cathode 5 is equipped with
Return current rail；Traction institute 1 and decompression institute 2 access Traction networks anode 4 and Traction networks cathode 5.
In embodiment, Traction networks anode 4 is powered using overhead contact line mode to vehicle；Traction networks anode 4 is in traction institute 1
Place is equipped with electricity segmentation, and Traction networks anode 4 is divided into different traction power supply subregions.
In embodiment, Traction networks cathode 5 is powered by return current rail to vehicle, and Traction networks cathode 5 is flowed back by special rail.
In embodiment, rail 6 is open to traffic, and carries out parallel connection by cable and aerial earth wire 3；Rail 6 is located AT STATION
Access ground connection busbar 7.
In embodiment, traction institute 1 and decompression institute 2 are equipped with return current rail ground connection cabinet 8；Traction institute 1 is equipped with negative ground one-way conduction
Cabinet 9；Return current rail ground connection cabinet 8 and negative ground one-way conduction cabinet 9 are connected between Traction networks cathode 5 and ground connection busbar 7.
In embodiment, as shown in fig. 6, being equipped with disconnecting switch 91, current measurement warning circuit inside negative ground one-way conduction cabinet 9
92, diode 93 and resistance 94.
Embodiment 3:
A kind of rail traffic special rail reflux power supply system, as shown in figure 5, including traction institute 1, decompression 2, aerial earth wire
3, Traction networks anode 4, Traction networks cathode 5, rail 6 and ground connection busbar 7,
Aerial earth wire 3, Traction networks anode 4, Traction networks cathode 5, rail 6 and ground connection busbar 7 are arranged successively from high to low；
Traction networks anode 4 is equipped with contact net；Contact net includes downlink contact net 101 and upcoming contact net 102；Traction networks cathode 5 is equipped with
Return current rail；Traction institute 1 and decompression institute 2 access Traction networks anode 4 and Traction networks cathode 5.
In embodiment, Traction networks anode 4 is powered using overhead contact line mode to vehicle；Traction networks anode 4 is in traction institute 1
Place is equipped with electricity segmentation, and Traction networks anode 4 is divided into different traction power supply subregions.
In embodiment, Traction networks cathode 5 is powered by return current rail to vehicle, and Traction networks cathode 5 is flowed back by special rail.
In embodiment, rail 6 is open to traffic, and carries out parallel connection by cable and aerial earth wire 3；Rail 6 is located AT STATION
Access ground connection busbar 7.
In embodiment, traction institute 1 and decompression institute 2 are all provided with rail potential limiting device 11, and rail potential limiting device 11 is connected to
Between Traction networks cathode 5 and ground connection busbar 7, when voltage is higher than definite value, rail potential limiting device 11 is closed, and keeps cathode and ground short
It connects and realizes short circuit current circulation.
It is described the invention in detail above by embodiment, but the content is only exemplary implementation of the invention
Example, should not be considered as limiting the scope of the invention.Protection scope of the present invention is defined by the claims.All utilizations
Technical solutions according to the invention or those skilled in the art are under the inspiration of technical solution of the present invention, in reality of the invention
In matter and protection scope, designs similar technical solution and reach above-mentioned technical effect, or to made by application range
All the changes and improvements etc. should still belong to patent of the invention and cover within protection scope.
Claims (9)
- The power supply system 1. a kind of rail traffic special rail flows back, including draw institute, decompression institute, aerial earth wire, Traction networks anode, lead Draw net cathode, rail and ground connection busbar, which is characterized in thatThe Traction networks anode is equipped with contact net；The contact net includes downlink contact net and upcoming contact net；The Traction networks Cathode is equipped with return current rail；It is described to draw accessed Traction networks anode and Traction networks cathode；The accessed Traction networks cathode of decompression.
- The power supply system 2. a kind of rail traffic special rail according to claim 1 flows back, which is characterized in that the Traction networks Anode is powered using overhead contact line mode to vehicle；The Traction networks anode is segmented in the locating electricity that is equipped with of traction, by Traction networks Anode is divided into different traction power supply subregions.
- The power supply system 3. a kind of rail traffic special rail according to claim 1 flows back, which is characterized in that the Traction networks Cathode is powered by dedicated return current rail to vehicle, and the Traction networks cathode is flowed back by special rail.
- The power supply system 4. a kind of rail traffic special rail according to claim 1 flows back, which is characterized in that the rail It is open to traffic, is carried out by cable and aerial earth wire in parallel；The rail locates access ground connection busbar AT STATION.
- The power supply system 5. a kind of rail traffic special rail according to claim 1 flows back, which is characterized in that the traction institute Cabinet is grounded with the be equipped with return current rail of decompression；The be equipped with negative ground one-way conduction cabinet of traction；The return current rail is grounded cabinet And negative ground one-way conduction cabinet is connected between Traction networks cathode and ground connection busbar.
- The power supply system 6. a kind of rail traffic special rail according to claim 5 flows back, which is characterized in that the negative ground list Current measurement warning circuit and diode are equipped with inside to conducting cabinet.
- The power supply system 7. a kind of rail traffic special rail according to claim 5 flows back, which is characterized in that the negative ground list Have inside to conducting cabinet and does not set resistance and set the resistance two ways less than 200 milliohms.
- The power supply system 8. a kind of rail traffic special rail according to claim 5 flows back, which is characterized in that the negative ground list Have inside to conducting cabinet and does not set disconnecting switch and set disconnecting switch two ways.
- The power supply system 9. a kind of rail traffic special rail according to claim 5 flows back, which is characterized in that the negative ground list It can be substituted to conducting cabinet and cathode rail ground connection cabinet by side rail wear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710544699.1A CN109109679A (en) | 2017-07-06 | 2017-07-06 | A kind of rail traffic special rail reflux power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710544699.1A CN109109679A (en) | 2017-07-06 | 2017-07-06 | A kind of rail traffic special rail reflux power supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109109679A true CN109109679A (en) | 2019-01-01 |
Family
ID=64821770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710544699.1A Pending CN109109679A (en) | 2017-07-06 | 2017-07-06 | A kind of rail traffic special rail reflux power supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109109679A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111806306A (en) * | 2020-06-05 | 2020-10-23 | 天津中铁电气化设计研究院有限公司 | Double-protection grounding wire method for direct-current traction power supply double-insulation contact network system |
| CN112092684A (en) * | 2020-11-09 | 2020-12-18 | 宁波中车轨道交通装备有限公司 | Subway return rail switching method and system adopting double return rail system |
| CN112092631A (en) * | 2020-11-09 | 2020-12-18 | 宁波中车轨道交通装备有限公司 | Pantograph control method and system of subway with switchable return rails |
| CN117341546A (en) * | 2023-12-05 | 2024-01-05 | 中国铁路设计集团有限公司 | Redundant traction power supply system based on special return rail for urban rail transit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009270999A (en) * | 2008-05-09 | 2009-11-19 | Murata Mach Ltd | Earth fault detecting circuit and earth fault detecting method |
| KR20130105060A (en) * | 2012-03-16 | 2013-09-25 | 한국철도기술연구원 | Directional selective ground relay system and control method in dc traction power supply system |
| CN204037372U (en) * | 2014-09-15 | 2014-12-24 | 国家电网公司 | The resonance being applied to urban track traffic tractive power supply system suppresses circuit |
| 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 |
-
2017
- 2017-07-06 CN CN201710544699.1A patent/CN109109679A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009270999A (en) * | 2008-05-09 | 2009-11-19 | Murata Mach Ltd | Earth fault detecting circuit and earth fault detecting method |
| KR20130105060A (en) * | 2012-03-16 | 2013-09-25 | 한국철도기술연구원 | Directional selective ground relay system and control method in dc traction power supply system |
| CN204037372U (en) * | 2014-09-15 | 2014-12-24 | 国家电网公司 | The resonance being applied to urban track traffic tractive power supply system suppresses circuit |
| 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 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111806306A (en) * | 2020-06-05 | 2020-10-23 | 天津中铁电气化设计研究院有限公司 | Double-protection grounding wire method for direct-current traction power supply double-insulation contact network system |
| CN112092684A (en) * | 2020-11-09 | 2020-12-18 | 宁波中车轨道交通装备有限公司 | Subway return rail switching method and system adopting double return rail system |
| CN112092631A (en) * | 2020-11-09 | 2020-12-18 | 宁波中车轨道交通装备有限公司 | Pantograph control method and system of subway with switchable return rails |
| CN117341546A (en) * | 2023-12-05 | 2024-01-05 | 中国铁路设计集团有限公司 | Redundant traction power supply system based on special return rail for urban rail transit |
| CN117341546B (en) * | 2023-12-05 | 2024-02-20 | 中国铁路设计集团有限公司 | Redundant traction power supply system based on special return rail for urban rail transit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109109679A (en) | A kind of rail traffic special rail reflux power supply system | |
| CN106828202B (en) | A kind of reflux unit at city rail section, field wire isolated rail joint | |
| CN109130961B (en) | Special return rail system positive line sectional design method | |
| Niasati et al. | Overview of stray current control in DC railway systems | |
| CN109142942A (en) | A kind of power supply system Traction networks that positive and negative anodes insulate leakage monitoring system over the ground | |
| CN105573165B (en) | Intelligent protection control system for platform door potential abnormality and protection method thereof | |
| CN108790957B (en) | Urban rail transit comprehensive grounding system applied to alternating current traction power supply system | |
| CN108832605B (en) | The longitudinal protection method of identification mixing both-end DC power transmission line area internal and external fault | |
| CN106992496A (en) | Earth leakage protecting method for Feeding System of Urban Rail Transit | |
| CN109149536A (en) | A kind of DC power-supply system Traction networks ground protection mode that positive and negative anodes insulate | |
| CN109130962B (en) | Special return track system field segment segmentation method | |
| CN205283114U (en) | Stray current suppression device that power supply system revealed in return circuit among subway tunnel of city | |
| CN116500378B (en) | Method for judging position of positive pole to ground short circuit fault of subway special rail reflux power supply system | |
| CN201226416Y (en) | Special grounding network for restraining DC magnetic bias phenomena transformer neutral point | |
| CN106585430B (en) | Drainage device for buried oil gas pipeline and subway and use method thereof | |
| CN107947129A (en) | A kind of zero-sequenceprotection method | |
| CN108075450B (en) | A kind of guard method and protective device for direct current suspension power supply system | |
| CN109501638B (en) | Rubber wheel rail vehicle power supply system and control method thereof | |
| CN106249108A (en) | The Fault Locating Method of a kind of the AC in the DC system and positioner | |
| CN206703999U (en) | A kind of drain means being used between buried oil-gas pipeline and underground railway track | |
| CN103178363B (en) | Grounding device for lightning impulse | |
| CN111361460B (en) | Direct current traction power supply system of rail transit on steel structure bridge | |
| CN112265475B (en) | Method for designing field section grounding path sections of direct-current traction power supply system | |
| CN109455111B (en) | Power supply system for rubber-tyred rail vehicle and rail thereof | |
| CN203496704U (en) | Lightning strike restraining type overhead contact system of electrified rail tractive power supply system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: Room 125, 36 Central West Road, pilot free trade zone (Airport Economic Zone), Binhai New Area, Tianjin Applicant after: CHINA RAILWAY ELECTRIFICATION SURVEY DESIGN & RESEARCH INSTITUTE Co.,Ltd. Applicant after: NINGBO RAIL TRANSIT GROUP Co.,Ltd. Address before: 300250 No. 531-83, 18 Fuyuan Road, Wuqing Development Zone, Wuqing District, Tianjin (centralized office area) Applicant before: TIANJIN ZHONGTIE ELECTRIFICATION DESIGN RESEARCH INSTITUTE Co.,Ltd. Applicant before: NINGBO RAIL TRANSIT GROUP Co.,Ltd. |
|
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190101 |