CN116767032B - Dual-traction-network power supply system based on multipurpose power supply rail - Google Patents
Dual-traction-network power supply system based on multipurpose power supply rail Download PDFInfo
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- CN116767032B CN116767032B CN202311033889.9A CN202311033889A CN116767032B CN 116767032 B CN116767032 B CN 116767032B CN 202311033889 A CN202311033889 A CN 202311033889A CN 116767032 B CN116767032 B CN 116767032B
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- 238000011144 upstream manufacturing Methods 0.000 description 8
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Abstract
The invention provides a double-traction-network power supply system based on a multipurpose power supply rail, which belongs to the technical field of rail transit and comprises a contact network, the multipurpose power supply rail and a running rail, wherein in a traction substation, the positive electrode of a traction unit is connected with a positive electrode bus, the positive electrode bus is respectively connected with the contact network and the multipurpose power supply rail through feeder cables, positive electrode direct current switches are arranged on the feeder cables, the negative electrode of the traction unit is connected with a negative electrode bus, the negative electrode bus is connected with the multipurpose power supply rail through a backflow cable A, the backflow cable A is provided with a negative electrode switch, the negative electrode bus is connected with the running rail through a backflow cable B, and a diode is arranged on the backflow cable B. The invention provides two traction power supply modes, when the overhead contact system fails, the multipurpose power supply rail is used as the positive electrode of the traction network, the travelling rail is used as the negative electrode of the traction network, and the train can be driven into the adjacent station for riding and evacuating, so that the reliability of the power supply system is improved.
Description
Technical Field
The invention belongs to the technical field of rail transit, and particularly relates to a dual-traction-network power supply system based on a multipurpose power supply rail.
Background
The traction power supply system is used as the most important energy facility in urban rail transit and continuously supplies power for the train, so that the normal operation of the vehicle is ensured. At present, the rail transit lines in most cities in China adopt a single traction network power supply mode, namely a traction network power supply mode of overhead line flow teaching and running rail backflow. The contact net is used as an anode, the running rail is used as a cathode, and the traction substation provides a DC750V or DC1500V power supply for the anode and the cathode of the traction net. In the system, the running rail is used as a negative electrode, the leakage resistance to the ground is small, a large amount of stray current in the traction power supply system leaks into the ground, and the corrosion risk exists for surrounding oil and gas pipelines. When a disconnection fault occurs, for example, the contact network is disconnected, the power supply cannot be ensured in a fault zone, and a train is stopped in the zone, so that emergency evacuation of passengers is not facilitated.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a double-traction-net power supply system based on a multipurpose power supply rail, wherein a contact net is used as a traction net anode under normal working conditions, the multipurpose power supply rail is used as a traction net cathode, and the multipurpose power supply rail is installed in an insulating way, so that the leakage of stray current can be effectively prevented; when the overhead line system fails, the multipurpose power supply rail is used as the positive electrode of the traction network, the running rail is used as the negative electrode of the traction network, a second traction power supply mode is provided, the train can be driven into the adjacent station for riding and evacuating, and the reliability of the power supply system is improved.
The technical scheme adopted by the invention is as follows: the utility model provides a dual traction network power supply system based on multipurpose power supply rail, includes contact net, multipurpose power supply rail and walking rail, in the traction substation, the positive pole of traction unit is connected with positive pole busbar, positive pole busbar respectively through feeder cable with contact net, multipurpose power supply rail are connected, be provided with positive pole direct current switch on the feeder cable, traction unit's negative pole is connected with negative pole busbar, negative pole busbar is through backflow cable A with multipurpose power supply rail connection, backflow cable A is provided with negative pole switch, negative pole busbar through backflow cable B with walking rail connection, backflow cable B is last to be provided with the diode;
the overhead line system is used as a traction network anode to supply power to the train in a normal power supply mode, and the multipurpose power supply rail is used as a traction network cathode to provide a reflux passage for the train;
the overhead line system fault power supply mode is characterized in that the multipurpose power supply rail is used as a traction network anode to supply power for a train, and the running rail is used as a traction network cathode to provide a return path for the train.
Furthermore, the overhead contact system and the multipurpose power supply rail are provided with segmented insulators at the traction substation, and the areas between the adjacent traction substations are divided into different traction power supply partitions.
Further, when the overhead line in the traction power supply partition fails, the power supply mode of the traction power supply partition is switched from the normal power supply mode to the overhead line failure power supply mode.
Further, when the normal power supply mode is switched to the overhead line system fault power supply mode, the positive direct current switch between the positive bus and the overhead line system is switched from a closed state to an open state, the positive direct current switch between the positive bus and the multipurpose power supply rail is switched from the open state to the closed state, and the negative switch is switched from the closed state to the open state.
Furthermore, the multipurpose power supply rail is installed in an insulating mode.
Further, the number of the overhead contact system and the number of the multipurpose power supply rails are two, and the overhead contact system and the multipurpose power supply rails correspond to the ascending and the descending of the train respectively.
Further, a ground switch is connected to the return cable B, and the ground switch is connected in parallel with the diode.
Further, the anode of the diode is connected with the running rail, and the cathode of the diode is connected with the cathode bus.
Further, the traction unit adopts two groups of rectifier units of the same structure, the rectifier units comprise a rectifier transformer RT1 and a rectifier R1, the rectifier transformer RT1 is connected with the rectifier R1, an outlet positive electrode of the rectifier R1 is connected with the positive bus through a positive incoming line, a current transformer LH01 and a direct current breaker QF01 are arranged on the positive incoming line, an outlet negative electrode of the rectifier R1 is connected with the negative bus through a negative incoming line, a manual isolating switch GL01 is arranged on the negative incoming line, and a lightning arrester BL1 is arranged between the outlet positive electrode and the outlet negative electrode.
Further, an electrical interlocking device is arranged between the positive electrode direct current switch and the negative electrode switch on the feeder cable connected with the multipurpose power supply rail.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention provides two power supply modes: under normal working conditions, the contact net is used as the positive electrode of the traction net, and the multipurpose power supply rail is used as the negative electrode of the traction net, so that the power supply system can effectively prevent stray current leakage; and after the contact net fails, the fault traction section is switched to a multipurpose power supply rail serving as a traction net anode, and the travelling rail serving as a traction net cathode supplies power for a train in the fault traction section, so that emergency measures such as passenger evacuation and the like are ensured after the train in the fault traction section can travel to an adjacent station.
2. The multipurpose power supply rail adopts an insulation installation mode, the insulation level is equivalent to that of a contact net, and the multipurpose power supply rail can be used as a negative electrode of a traction net in normal operation, so that leakage of stray current can be effectively prevented, corrosion risk of the stray current to oil and gas pipelines around a subway is avoided, and good social benefit is achieved; when the overhead line system fails, the multipurpose power supply rail is used as the positive electrode of the traction network, the insulation level can meet the requirements of a power supply system, the train can be guaranteed to drive into an adjacent station and then take a car for evacuation, and the reliability of the power supply system is improved.
Drawings
FIG. 1 is a schematic diagram of a dual traction grid power supply system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a main connection of a traction substation according to an embodiment of the present invention.
In the figure: the device comprises a 1-contact net, a 2-multipurpose power supply rail, a 3-running rail, a 4-traction unit, a 5-positive direct current switch, a 6-negative switch, a 7-diode, an 8-grounding switch, a 9-sectional insulator and a 10-traction substation; 11-positive electrode bus; 12-feeder cable; 13-a negative electrode bus; 14-a return cable a; 15-return cable B.
Detailed Description
The present invention will be described in detail below with reference to the drawings and the specific embodiments, so that those skilled in the art can better understand the technical solutions of the present invention.
The embodiment of the invention provides a dual-traction-net power supply system based on a multipurpose power supply rail, which comprises a contact net 1, the multipurpose power supply rail 2 and a running rail 3 as shown in fig. 1-2. The overhead contact system 1, the multipurpose power supply rail 2 and the running rail 3 are arranged along a train running line; the contact net 1 and the multipurpose power supply rail 2 are installed in an insulating mode; the running rail 3 is arranged on the ground. A plurality of traction substations 10 are arranged on the train running line.
In the traction substation 10, the positive electrode of the traction unit 4 is connected with a positive electrode bus 11, and the negative electrode of the traction unit 4 is connected with a negative electrode bus 13. Specifically, the traction unit 4 adopts two groups of rectifier units of the same structure, the rectifier units comprise a rectifier transformer RT1 and a rectifier R1, the rectifier transformer RT1 is connected with the rectifier R1, an outlet positive electrode of the rectifier R1 is connected with a positive bus through a positive incoming line, a current transformer LH01 and a direct current breaker QF01 are arranged on the positive incoming line, an outlet negative electrode of the rectifier R1 is connected with a negative bus through a negative incoming line, a manual isolating switch GL01 is arranged on the negative incoming line, and a lightning arrester BL1 is arranged between an outlet positive electrode and an outlet negative electrode of the rectifier R1.
The positive bus 11 is connected with the contact net 1 and the multipurpose power supply rail 2 through feeder cables 12 respectively, and the feeder cables 12 are provided with positive direct current switches 5. The negative bus 13 is connected with the multipurpose power supply rail 2 through a backflow cable A14, a negative switch 6 is arranged on the backflow cable A14, the negative bus 13 is connected with the running rail 3 through a backflow cable B15, and a diode 7 is arranged on the backflow cable B15. The positive pole of diode 7 with walking rail 3 is connected, the negative pole of diode 7 with negative pole busbar 13 is connected, ensures that stray current can only follow walking rail 3 one-way backward flow to negative pole busbar 13. A ground switch 8 is connected to the return cable B15, and the ground switch 8 is connected in parallel to the diode 7. The grounding switch 8 is normally open and is used as a bypass of the diode 7, and when the diode 7 fails, the grounding switch 8 is closed, so that the operation of the system is ensured.
The overhead contact system 1 and the multipurpose power supply rail 2 are provided with segmented insulators 9 at the traction substation 10, and the adjacent areas between the traction substation 10 are divided into different traction power supply partitions. Correspondingly, the positive bus 11 is respectively connected with the contact net 1 and the multipurpose power supply rail 2 at two sides of the segmented insulator 9 through feeder cables 12. When a contact net 1 fails in a traction power supply partition, the power supply modes of the failed traction power supply partition are switched, so that the continuous operation of the traction power supply partition is ensured, and other traction power supply partitions are not affected.
Conventionally, the number of the overhead lines 1 is two, namely an uplink overhead line and a downlink overhead line, which correspond to the uplink and the downlink of the train respectively. Therefore, in this embodiment, the number of multipurpose power supply rails 2 is also two, namely an uplink multipurpose power supply rail and a downlink multipurpose power supply rail, which also correspond to the uplink and the downlink of the train, respectively. Correspondingly, the running rails 3 are also divided into an upper running rail and a lower running rail.
At the traction substation 10, a sectionalized insulator 9 is arranged on each of the contact net 1 and the multipurpose power supply rail 2 to divide the contact net 1 and the multipurpose power supply rail 2 into: an upstream contact net small mileage side, an upstream contact net large mileage side, a downstream contact net small mileage side, a downstream contact net large mileage side, an upstream multipurpose power supply rail small mileage side, an upstream multipurpose power supply rail large mileage side, a downstream multipurpose power supply rail small mileage side and a downstream multipurpose power supply rail large mileage side. In fig. 1, the left side view of the segment insulator 9 is the small mileage side, and the right side view is the large mileage side.
As shown in fig. 1, the positive bus 11 is respectively connected with the contact net 1 and the multipurpose power supply rail 2 at two sides of the segment insulator 9 through the feeder cable 12, that is, is respectively connected with an upstream contact net small mileage side, an upstream contact net large mileage side, a downstream contact net small mileage side, a downstream contact net large mileage side, an upstream multipurpose power supply rail small mileage side, a downstream multipurpose power supply rail small mileage side, an upstream multipurpose power supply rail large mileage side and a downstream multipurpose power supply rail large mileage side.
Positive dc switches 5 are provided on each of the six feeder cables 12. The positive DC switch 5 adopts DC breakers respectively named as DC breakers QF 11-QF 16. According to the conventional practice, the feeder cable 12 is further provided with a current transformer and a manual isolating switch, which are named as a current transformer LH 11-current transformer LH16 and a manual isolating switch GL 11-manual isolating switch GL16, respectively. Specifically, a direct current breaker QF11, a current transformer LH11 and a manual isolating switch GL11 are sequentially arranged on the feeder cable 12 between the positive bus 11 and the small mileage side of the uplink contact net; a direct-current breaker QF12, a current transformer LH12 and a manual isolating switch GL12 are sequentially arranged on the feeder cable 12 between the positive bus 11 and the large mileage side of the uplink contact network; a direct-current breaker QF13, a current transformer LH13 and a manual isolating switch GL13 are sequentially arranged on the feeder cable 12 between the positive bus 11 and the small mileage side of the downlink contact network; a direct-current breaker QF14, a current transformer LH14 and a manual isolating switch GL14 are sequentially arranged on the feeder cable 12 between the positive bus 11 and the large mileage side of the downlink contact network; a direct-current breaker QF15, a current transformer LH15 and a manual isolating switch GL15 are sequentially arranged on the feeder cable 12 between the positive bus 11 and the small mileage side of the uplink multipurpose power supply rail and between the positive bus 11 and the small mileage side of the downlink multipurpose power supply rail; the direct-current circuit breaker QF16, the current transformer LH16 and the manual isolating switch GL16 are sequentially arranged on the feeder cable 12 between the positive bus 11 and the large mileage side of the uplink multipurpose power supply rail and between the positive bus 11 and the large mileage side of the downlink multipurpose power supply rail.
The negative bus 13 is connected with the small mileage side of the uplink multipurpose power supply rail, the small mileage side of the downlink multipurpose power supply rail, the large mileage side of the uplink multipurpose power supply rail and the large mileage side of the downlink multipurpose power supply rail through a return cable A14 respectively. The return cable a14 is provided with a negative electrode switch 6. The negative electrode switches 6 adopt direct current breakers respectively named as direct current breakers QF 17-QF 18. According to the existing habit, a current transformer is further arranged on the reflow cable A14, and the current transformers are named as current transformers LH 17-LH 18 respectively. Specifically, a direct current breaker QF17 and a current transformer LH17 are sequentially arranged on the reflow cable a14 between the negative electrode bus 13 and the small mileage side of the uplink multipurpose power supply rail and between the negative electrode bus 13 and the small mileage side of the downlink multipurpose power supply rail; and a direct-current breaker QF18 and a current transformer LH18 are sequentially arranged on the reflow cable A14 between the negative bus 13 and the large mileage side of the uplink multipurpose power supply rail and between the negative bus 13 and the large mileage side of the downlink multipurpose power supply rail. The negative bus 13 is connected with the upper traveling rail and the lower traveling rail simultaneously through a return cable B15.
A first electric interlocking device LS11 is arranged between the dc breaker QF15 and the dc breaker QF 17. A second electrical interlock device LS12 is provided between the dc breakers QF16, QF18. The short circuit fault caused by the simultaneous electrical connection of the positive bus and the negative bus with the multipurpose power supply rail is avoided.
A voltage measuring device VD is arranged between the positive bus 11 and the negative bus 13. An arrester BL2 is arranged between the negative bus 11 and the ground.
The present embodiment has two power supply modes. The first is normal power supply mode, under normal working condition, contact net 1 is as traction net positive pole, for the train power supply, multipurpose power supply rail 2 is as traction net negative pole, provides the backward flow route for the train. The running rail 3 does not serve as an electrical energy transmission conductor of the traction power supply system. At this time, the dc breakers QF11 to QF14, QF17 and QF18 are in the on state, and the dc breakers QF15 and QF16 are in the off state.
The second is the fault power supply mode of the contact net, the multipurpose power supply rail 2 is used as the positive electrode of the traction net to supply power for the train, and the running rail 3 is used as the negative electrode of the traction net to provide a reflux passage for the train. At this time, the dc breakers QF11 to QF14, QF17 and QF18 are in the open state, and the dc breakers QF15 and QF16 are in the closed state.
And when the overhead contact system 1 in the traction power supply partition fails, for example, when a train detects that the overhead contact system 1 fails, a signal is sent to a background dispatch. The traction power supply subareas correspondingly carry out switching in the two traction substation 10: the direct current breakers QF 11-QF 14, QF17 and QF18 are switched from the switching-on state to the switching-off state, and the direct current breakers QF15 and QF16 are switched from the switching-off state to the switching-on state. The traction substation 10 cuts off the power supply to the overhead line system 1 of the fault traction power supply partition. The power supply mode of the fault traction power supply partition is switched from the normal power supply mode to the contact network fault power supply mode.
The present invention has been described in detail by way of examples, but the description is merely exemplary of the invention and should not be construed as limiting the scope of the invention. The scope of the invention is defined by the claims. In the technical scheme of the invention, or under the inspired by the technical scheme of the invention, similar technical schemes are designed to achieve the technical effects, or equivalent changes and improvements to the application scope are still included in the protection scope of the patent coverage of the invention.
Claims (10)
1. A dual traction network power supply system based on a multipurpose power supply rail is characterized in that: the traction substation comprises a contact net, a multipurpose power supply rail and a running rail, wherein in the traction substation, the positive electrode of a traction unit is connected with a positive electrode bus, the positive electrode bus is connected with the contact net and the multipurpose power supply rail through feeder cables respectively, positive electrode direct current switches are arranged on the feeder cables, the negative electrode of the traction unit is connected with a negative electrode bus, the negative electrode bus is connected with the multipurpose power supply rail through a backflow cable A, a negative electrode switch is arranged on the backflow cable A, the negative electrode bus is connected with the running rail through a backflow cable B, and diodes are arranged on the backflow cable B;
the traction substation is characterized in that a sectioning insulator is arranged on each of the contact net and the multipurpose power supply rail to divide the contact net and the multipurpose power supply rail into: an uplink contact net small mileage side, an uplink contact net large mileage side, a downlink contact net small mileage side, a downlink contact net large mileage side, an uplink multipurpose power supply rail small mileage side, an uplink multipurpose power supply rail large mileage side, a downlink multipurpose power supply rail small mileage side and a downlink multipurpose power supply rail large mileage side; a direct-current breaker QF11, a current transformer LH11 and a manual isolating switch GL11 are sequentially arranged on the feeder cable between the positive bus and the small mileage side of the uplink contact net; a direct-current breaker QF12, a current transformer LH12 and a manual isolating switch GL12 are sequentially arranged on the feeder cable between the positive bus and the large mileage side of the uplink contact net; a direct-current breaker QF13, a current transformer LH13 and a manual isolating switch GL13 are sequentially arranged on the feeder cable between the positive bus and the small mileage side of the downlink contact network; a direct-current breaker QF14, a current transformer LH14 and a manual isolating switch GL14 are sequentially arranged on the feeder cable between the positive bus and the large mileage side of the downlink contact network; a direct-current breaker QF15, a current transformer LH15 and a manual isolating switch GL15 are sequentially arranged on the feeder cable between the positive bus and the small mileage side of the uplink multipurpose power supply rail and between the positive bus and the small mileage side of the downlink multipurpose power supply rail; a direct-current breaker QF16, a current transformer LH16 and a manual isolating switch GL16 are sequentially arranged on the feeder cable between the positive bus and the large mileage side of the uplink multipurpose power supply rail and between the positive bus and the large mileage side of the downlink multipurpose power supply rail;
a direct-current breaker QF17 and a current transformer LH17 are sequentially arranged on the reflow cable A between the negative bus and the small mileage side of the uplink multipurpose power supply rail; a direct-current breaker QF18 and a current transformer LH18 are sequentially arranged on the reflow cable A between the negative bus and the large mileage side of the uplink multipurpose power supply rail and between the negative bus and the large mileage side of the downlink multipurpose power supply rail;
the overhead line system is used as a traction network anode to supply power to the train in a normal power supply mode, and the multipurpose power supply rail is used as a traction network cathode to provide a reflux passage for the train; at this time, the direct current breakers QF11 to QF14, QF17 and QF18 are in the on state, and the direct current breakers QF15 and QF16 are in the off state; the overhead line system fault power supply mode is characterized in that the multipurpose power supply rail is used as a traction network anode to supply power to a train, and the running rail is used as a traction network cathode to provide a reflux passage for the train; at this time, the dc breakers QF11 to QF14, QF17 and QF18 are in the open state, and the dc breakers QF15 and QF16 are in the closed state.
2. A dual traction grid power supply system based on a multi-purpose power rail as claimed in claim 1, wherein: the overhead contact system and the multipurpose power supply rail are provided with segmented insulators at the traction substation, and the adjacent areas between the traction substations are divided into different traction power supply partitions.
3. A dual traction grid power supply system based on a multi-purpose power rail as claimed in claim 2, wherein: when the overhead contact system in the traction power supply partition breaks down, the power supply mode of the traction power supply partition is switched from the normal power supply mode to the overhead contact system fault power supply mode.
4. A dual traction grid power supply system based on a multi-purpose power supply rail as claimed in claim 1 or 3, wherein: when the normal power supply mode is switched to the overhead line system fault power supply mode, the positive direct current switch between the positive bus and the overhead line system is switched from a closed state to an open state, the positive direct current switch between the positive bus and the multipurpose power supply rail is switched from the open state to the closed state, and the negative switch is switched from the closed state to the open state.
5. A dual traction grid power supply system based on a multi-purpose power rail as claimed in claim 1, wherein: the multipurpose power supply rail is installed in an insulating mode.
6. A dual traction grid power supply system based on a multi-purpose power rail as claimed in claim 1, wherein: the number of the overhead contact lines and the number of the multipurpose power supply rails are two, and the overhead contact lines and the multipurpose power supply rails correspond to the ascending and the descending of the train respectively.
7. A dual traction grid power supply system based on a multi-purpose power rail as claimed in claim 1, wherein: and a grounding switch is connected with the reflow cable B, and the grounding switch is connected with the diode in parallel.
8. A dual traction grid power supply system based on a multi-purpose power supply rail as claimed in claim 1 or 7, wherein: the anode of the diode is connected with the running rail, and the cathode of the diode is connected with the cathode bus.
9. A dual traction grid power supply system based on a multi-purpose power rail as claimed in claim 1, wherein: the traction unit adopts two groups of rectifier units of the same structure, the rectifier units comprise a rectifier transformer RT1 and a rectifier R1, the rectifier transformer RT1 is connected with the rectifier R1, an outlet positive electrode of the rectifier R1 is connected with a positive bus through a positive incoming line, a current transformer LH01 and a direct current breaker QF01 are arranged on the positive incoming line, an outlet negative electrode of the rectifier R1 is connected with a negative bus through a negative incoming line, a manual isolating switch GL01 is arranged on the negative incoming line, and a lightning arrester BL1 is arranged between the outlet positive electrode and the outlet negative electrode.
10. A dual traction grid power supply system based on a multi-purpose power rail as claimed in claim 1, wherein: and an electrical interlocking device is arranged between the positive DC switch and the negative switch on the feeder cable connected with the multipurpose power supply rail.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311033889.9A CN116767032B (en) | 2023-08-17 | 2023-08-17 | Dual-traction-network power supply system based on multipurpose power supply rail |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311033889.9A CN116767032B (en) | 2023-08-17 | 2023-08-17 | Dual-traction-network power supply system based on multipurpose power supply rail |
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| CN116767032A CN116767032A (en) | 2023-09-19 |
| CN116767032B true CN116767032B (en) | 2023-12-08 |
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| CN217994213U (en) * | 2022-06-28 | 2022-12-09 | 中铁工程设计咨询集团有限公司 | Multi-system traction power supply system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103434421B (en) * | 2013-07-29 | 2015-10-21 | 华北电力大学（保定） | A kind of mixing inter-act DC traction power-supply system based on new forms of energy |
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2023
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07266936A (en) * | 1994-03-30 | 1995-10-17 | East Japan Railway Co | Method for making short circuit between electric overhead line and rail |
| CN105667348A (en) * | 2016-04-01 | 2016-06-15 | 中铁电气化勘测设计研究院有限公司 | Novel vehicle depot reflowing cable and steel rail wiring method based on track circuit mode |
| CN109149536A (en) * | 2017-07-06 | 2019-01-04 | 天津中铁电气化设计研究院有限公司 | A kind of DC power-supply system Traction networks ground protection mode that positive and negative anodes insulate |
| CN109130961A (en) * | 2017-07-06 | 2019-01-04 | 天津中铁电气化设计研究院有限公司 | A kind of dedicated return current rail system main track segment design scheme |
| CN217994213U (en) * | 2022-06-28 | 2022-12-09 | 中铁工程设计咨询集团有限公司 | Multi-system traction power supply system |
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