A kind of rail traffic special rail reflux power supply system
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.