Main wiring structure of a hub traction substation

Abstract

The present invention discloses a main wiring structure of a hub traction substation, which includes two external power supplies and two groups of traction transformers. It also includes a switching unit, several feedback lines, and two independently arranged busbars. One group of busbars is powered by one power supply, and the other group of busbars is powered by the other power supply. Each group of busbars is configured with the same number of feeder lines to form two independent power supply devices that are physically isolated and electrically separated from each other; the feeder lines all pass through the switching unit (7) and the corresponding switches (8); switches (8) are provided on all the feeder lines to achieve switching between the two groups of power supply devices through the switching of the switches. The main wiring structure of the hub traction substation of the present invention sets two mutually independent power supply devices. Due to the achievement of physical isolation and electrical separation, when one group of devices fails or is struck by lightning, the other group of devices can be unaffected and quickly put into operation, thus restoring normal power supply and improving power supply reliability.

Description

Technical Field

[0001] The present invention belongs to the technical field of power supply and transformation for electrified railways, and more specifically, relates to a main wiring structure of a hub traction substation. Background Art

[0002] With the rapid development of high-speed railways, the operation of electrified railways has higher and higher requirements for the traction power supply system. Especially for hub-type traction substations that supply power to multiple lines simultaneously, the power supply reliability has increasingly attracted the attention and emphasis of operating units.

[0003] In the prior art, in order to ensure the reliable power supply of electrified railway traction substations, generally, the two incoming lines of the traction substation are independent power sources. Two groups of traction transformers in the substation adopt a standby mode, and the equipment in the substation realizes automatic switching to ensure that when the operating incoming line loses voltage or the operating transformer fails, it can automatically switch to the standby transformer. As Figure 1 shown, it is the form of the main wiring structure of the traction substation in the prior art. When one incoming line fails, the other incoming line can work. When one power source fails, it can switch to the other group of power sources to work.

[0004] However, this structure has defects: First, when one busbar fails, the traction substation will have some feeders withdrawn from operation due to equipment failures; Second, the two busbars are powered by the same traction transformer, so there is an electrical connection between the two busbars. When lightning strikes, it may cause a destructive blow to the entire substation. When the above two types of failures occur, all repairs are required, and the repair cycle is relatively long. Also, because the line needs to adopt cross-district power supply and restrict train operation to restore part of the transportation organization, it will have an impact on the transportation organization of the line; if a traction substation in an important railway hub has the above failures, the scope of influence will be further expanded, and the impact on the entire hub area is self-evident. Summary of the Invention

[0005] Aiming at the above defects or improvement requirements of the prior art, the present invention provides a main wiring structure of a hub traction substation, which adopts two relatively independent traction power supply devices to operate in a primary and secondary standby mode, and realizes physical isolation and electrical separation; when one group of traction power supply devices fails, the other group of devices can be unaffected and can be quickly put into operation, thereby reducing the impact on the transportation organization in the hub.

[0006] To achieve the above object, the present invention provides a main wiring structure of a hub traction substation, including two external power supplies and two groups of traction transformers. It is characterized in that it further includes a switching unit, several feedback lines, a first group of buses and a second group of buses independently arranged. The first group of buses is powered by one external power supply and one group of traction transformers, and the second group of buses is powered by the other external power supply and one group of traction transformers to form two independent power supply devices that are physically isolated and electrically separated from each other.

[0007] Each group of the buses is of a single-bus or single-bus sectionalized wiring structure. The number of sections of the two groups of buses is the same, and each section of the first group of buses is arranged corresponding to each section of the second group of buses one by one; each group of buses is configured with the same number of feeder lines, and the feeder lines of the second group of buses are arranged corresponding to the feeder lines of the first group of buses one by one. The corresponding feeder lines in the two groups of buses are merged into one outgoing feeder line. Each feedback line in the two groups of buses is provided with a switch, and each outgoing feeder line is also provided with a switch to realize the switching between the two groups of buses through the switches.

[0008] Further, a bus coupler is provided between each corresponding section of the first group of buses and the second group of buses.

[0009] Further, a circuit breaker and a disconnecting switch are provided on each of the bus couplers.

[0010] Further, each group of the traction transformers respectively leads a power supply to each section of the two groups of buses.

[0011] Further, a circuit breaker is provided on the loop where each group of transformers supplies power to each section of the bus.

[0012] Further, the switching unit is arranged inside the traction substation or on the catenary.

[0013] Further, each group of the traction transformers adopts single-phase connection, three-phase V / v or V / x connection or three-phase-two-phase balance connection.

[0014] Further, the first group of buses includes a first bus and a second bus, the second group of buses includes a third bus and a fourth bus. The first bus is connected with a fifth feeder line and a seventh feeder line, the second bus is connected with a ninth feeder line and an eleventh feeder line, the third bus is connected with a sixth feeder line and an eighth feeder line, and the fourth bus is connected with a tenth feeder line and a twelfth feeder line.

[0015] Further, the fifth feeder line and the sixth feeder line are connected to a first feeder line, the seventh feeder line and the eighth feeder line are connected to a second feeder line, the ninth feeder line and the tenth feeder line are connected to a third feeder line, and the eleventh feeder line and the twelfth feeder line are connected to a fourth feeder line.

[0016] Generally speaking, compared with the prior art, the above technical solution conceived by the present invention can achieve the following beneficial effects:

[0017] (1) For the main wiring structure of the hub traction substation of the present invention, two relatively independent traction power supply devices operate in a one-main-one-backup mode and are physically isolated and electrically separated; when a fault occurs in one set of traction power supply devices, the other set of devices can be unaffected and can be quickly put into operation, thus reducing the impact on the transportation organization within the hub.

[0018] (2) For the main wiring structure of the hub traction substation of the present invention, through the parallel structure of the first bus coupler and the second bus coupler, during daily operation, the grid connection switching function of the two sets of traction power supply devices can be realized, thus saving the operation time of disconnecting all of one set of devices and connecting all of the other set of devices, improving the power supply flexibility, and facilitating operation and maintenance.

[0019] (3) For the main wiring structure of the hub traction substation of the present invention, both the first bus coupler and the second bus coupler are provided with circuit breakers and disconnectors. When the devices in the first traction substation unit are supplying power normally, the circuit breakers and disconnectors are all disconnected to cut off the electrical connection between the two busbars, thus ensuring that the other set of devices will not be affected when one set of devices is struck by lightning.

[0020] (4) For the main wiring structure of the hub traction substation of the present invention, since each traction transformer can supply power to each busbar, during daily operation, the grid connection switching function of the two sets of traction power supply devices can also be realized, thus saving the operation time of disconnecting all of one set of devices and connecting all of the other set of devices, improving the power supply flexibility, and facilitating operation and maintenance.

[0021] (5) For the main wiring structure of the hub traction substation of the present invention, circuit breakers are provided on the circuits where each group of traction transformers supply power to each busbar. When the devices in the first traction power supply unit are supplying power normally, the circuit breakers are all disconnected to cut off the electrical connection between the first traction power supply device and the second traction power supply device, thus ensuring that the other set of devices will not be affected when one set of devices is struck by lightning. Description of the Drawings

[0022] Figure 1 is a schematic diagram of the main wiring structure of a traction substation in the prior art;

[0023] Figure 2 is a schematic diagram of the main wiring structure of the hub traction substation in the first embodiment of the present invention;

[0024] Figure 3 is a schematic diagram of the main wiring structure of the hub traction substation in the second embodiment of the present invention;

[0025] Figure 4It is a schematic diagram of the main wiring structure of the hub traction substation in the third embodiment of the present invention;

[0026] Figure 5 It is a schematic diagram of the main wiring structure of the hub traction substation in the fourth embodiment of the present invention;

[0027] In all the drawings, the same reference numerals represent the same technical features, specifically: 1 - the first traction substation unit, 2 - the second traction substation unit; 101 - the first incoming line, 102 - the first traction transformer, 103 - the first busbar, 104 - the second busbar, 105 - the first branch, 106 - the second branch, 107 - the third branch, 108 - the fourth branch; 201 - the second incoming line, 202 - the second traction transformer, 203 - the third busbar, 204 - the fourth busbar, 205 - the fifth branch, 206 - the sixth branch, 207 - the seventh branch, 208 - the eighth branch; 3 - the first feeder, 4 - the second feeder, 5 - the third feeder, 6 - the fourth feeder, 301 - the fifth feeder, 302 - the sixth feeder, 401 - the seventh feeder, 402 - the eighth feeder, 501 - the ninth feeder, 502 - the tenth feeder, 601 - the eleventh feeder, 602 - the twelfth feeder; 7 - the parallel switch unit, 8 - the switch, 9 - the circuit breaker, 10 - the first bus tie, 11 - the second bus tie. Detailed implementation manners

[0028] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] Figure 2 It is a schematic diagram of the main wiring structure of the hub traction substation in the first embodiment of the present invention. As Figure 2 shown, the traction substation of the present invention includes a first traction power supply unit 1 and a second traction power supply unit 2. The first traction power supply unit 1 and the second traction power supply unit 2 are independently arranged in the same traction substation and are respectively powered by an external power supply; and the first traction power supply unit 1 is provided with a first incoming line 101 and a first traction transformer 102, and the second traction power supply unit 2 is provided with a second incoming line 201 and a second traction transformer 202; preferably, the first traction transformer 102 and the second traction transformer 202 adopt single-phase connection, three-phase V / v or V / x connection, three-phase-two-phase balance connection.

[0030] The first traction power supply unit 1 is provided with a first group of busbars. The first group of busbars includes a first busbar 103 and a second busbar 104. The second traction power supply unit 2 is provided with a second group of busbars. The second group of busbars includes a third busbar 203 and a fourth busbar 204. The first group of busbars is powered by an external power source and a set of traction transformers. The second group of busbars is powered by another external power source and a set of traction transformers. Therefore, there is no electrical connection between the first group of busbars and the second group of busbars. When lightning strikes, the first group of busbars and the second group of busbars will not affect each other. When one group of busbars fails due to lightning, the other intact group can continue to supply power and does not need to be repaired entirely. Moreover, there is no shared busbar between the first traction power supply unit 1 and the second traction power supply unit 2. Therefore, there is no physical connection between the first traction power supply unit and the second traction power supply unit. When a busbar or other equipment in the first traction substation unit 1 fails, it will not affect the realization of the functions of the second traction power supply unit 2. The second traction power supply unit 2 can work independently, and vice versa.

[0031] Two feeder lines are provided on each of the first busbar 103, the second busbar 104, the third busbar 203, and the fourth busbar 204. The first busbar 103 is connected to a fifth feeder line 301 and a seventh feeder line 401. The second busbar 104 is connected to a ninth feeder line 501 and an eleventh feeder line 601. The third busbar 203 is connected to a sixth feeder line 302 and an eighth feeder line 402. The fourth busbar 204 is connected to a tenth feeder line 502 and a twelfth feeder line 602. The above 8 feeder lines are arranged in parallel and all pass through a switching unit 7. Each feeder line is provided with a switch 8 at the switching unit 7. The on / off of the 8 feeder lines is controlled by the switch 8.

[0032] The main wiring structure of the hub traction substation of the present invention further includes four feeder lines, namely a first feeder line 3, a second feeder line 4, a third feeder line 5, and a fourth feeder line 6. The fifth feeder line 301 and the sixth feeder line 302 are connected to the first feeder line 3. The seventh feeder line 401 and the eighth feeder line 402 are connected to the second feeder line 4. The ninth feeder line 501 and the tenth feeder line 502 are connected to the third feeder line 5. The eleventh feeder line 601 and the twelfth feeder line 602 are connected to the fourth feeder line 6. That is, the power sources of the same feeder line come from two busbars.

[0033] Switches 8 are provided on all four feeder lines.

[0034] The access and disconnection control of two independent substation units is achieved jointly by the switches 8 on four feeders and the 8 switches on the parallel switch unit 7. In the wiring structure of the first embodiment, when the equipment in the first traction substation unit 1 fails or is struck by lightning, after completely disconnecting the first traction substation unit 1, that is, after disconnecting the corresponding switches of the first busbar 103 and the second busbar 104, then connect the second traction substation unit 2, that is, connect the corresponding switches of the third busbar 203 and the fourth busbar 204. Through the setting of the wiring structure of the first embodiment, it is possible to avoid the situation where a group of equipment failures or lightning strikes affect another group of equipment, resulting in the need for overall maintenance and delaying power supply. Only by controlling the switch switching between two substations without physical and electrical connections can backup power supply be completed, saving time and reducing the impact on railway transportation organization.

[0035] Preferably, the parallel switch unit 7 is arranged inside the traction substation or on the catenary.

[0036] Preferably, a circuit breaker is provided on the loop where each group of traction transformers is powered by each section of the busbar.

[0037] Figure 3 It is a schematic diagram of the main wiring structure of the hub traction substation in the second embodiment of the present invention. As Figure 3 shown, the main wiring structure of the traction substation in the second embodiment also includes two independently arranged traction substation units, and the settings of the first incoming line 101, the first traction transformer 102, the second incoming line 201, the second traction transformer 202, the first busbar 103, the second busbar 104, the parallel switch unit 7, the first feeder 3, the second feeder 4, the third feeder 5, the fourth feeder 6, the switching unit 7 and the switches are the same as those in the first embodiment. The first bus tie 10 and the second bus tie 11 are added in the second embodiment.

[0038] Among them, the first bus tie 10 is arranged between the first busbar 103 and the third busbar 203, and the second bus tie 11 is arranged between the second busbar 104 and the fourth busbar 204. The first bus tie 10 and the second bus tie 11 connect the two groups of busbars in parallel, so that it is not necessary to completely disconnect a group of equipment and then connect another group of equipment. Because it is in parallel, another group of intact equipment can be connected immediately after a fault occurs, and there will be no short-circuit problem, thus saving the time for the operation of completely disconnecting a group of equipment and connecting another group of equipment.

[0039] To avoid the amplified impact during lightning strikes due to parallel connection, circuit breakers 9 and disconnecting switches are installed in both the first bus coupler 10 and the second bus coupler 11. When the equipment in the first traction substation unit 1 is supplying power normally, the circuit breaker 9 is opened and the disconnecting switch is disconnected, cutting off the electrical connection between the two busbars, so as to ensure that when one set of equipment is struck by lightning, the other set of equipment will not be affected.

[0040] Figure 4 It is a schematic diagram of the main wiring structure of the hub traction substation in the third embodiment of the present invention. As Figure 4 shown, the main wiring structure of the traction substation in the third embodiment also includes two sets of independently arranged traction substation units, and the settings of the first incoming line 101, the first traction transformer 102, the second incoming line 201, the second traction transformer 202, the first busbar 103, the second busbar 104, the parallel switch unit 7, the first feeder 3, the second feeder 4, the third feeder 5, the fourth feeder 6, the parallel switch unit 7 and the switches are the same as those in the first embodiment.

[0041] The difference between the third embodiment and the first embodiment is that the first embodiment is a wiring structure with two sets of physical and electrical isolations based on a single busbar structure, and the third embodiment is a wiring structure of two independent substations based on a double busbar structure. Among them, the second traction substation unit 2 does not share the busbar with the first traction substation unit 1, so there is no physical connection. When the first traction substation unit 1 or the second traction substation unit 2 fails, the other set can supply power.

[0042] The first traction transformer 102 is provided with two wire leads corresponding to the first busbar 103 and the second busbar 104 respectively. The wire corresponding to the first busbar 103 has two branches, namely the first branch 105 and the second branch 106. One end of the first branch 105 is connected to the first traction transformer 102, and the other end is connected to the first busbar 103. One end of the second branch 106 is connected to the first traction transformer 102, and the other end is connected to the third busbar 203; the wire corresponding to the second busbar 104 has two branches, namely the third branch 107 and the fourth branch 108. One end of the third branch 107 is connected to the first traction transformer 102, and the other end is connected to the second busbar 104. One end of the fourth branch 108 is connected to the first traction transformer 102, and the other end is connected to the fourth busbar 204.

[0043] The second traction transformer 202 is provided with two wire leads corresponding to the third busbar 203 and the fourth busbar 204 respectively. The wire corresponding to the third busbar 203 has two branches, namely the fifth branch 205 and the sixth branch 206. One end of the fifth branch 205 is connected to the second traction transformer 202, and the other end is connected to the third busbar 203. One end of the sixth branch 206 is connected to the second traction transformer 202, and the other end is connected to the first busbar 103. The wire corresponding to the fourth busbar 204 has two branches, namely the seventh branch 207 and the eighth branch 208. One end of the seventh branch 207 is connected to the second traction transformer 202, and the other end is connected to the fourth busbar 204. One end of the eighth branch 208 is connected to the second traction transformer 202, and the other end is connected to the second busbar 104. Through such a double-bus connection, the two groups of busbars are paralleled, so that it is not necessary to disconnect all the devices in one group and then connect the other group of devices. Because they are paralleled, another group of intact devices can be connected immediately after a fault occurs, and there will be no short-circuit problem, thus saving the time for the operation of disconnecting all the devices in one group and connecting the other group of devices.

[0044] Circuit breakers are provided on the above-mentioned first branch 105, second branch 106, third branch 107, fourth branch 108, fifth branch 205, sixth branch 206, seventh branch 207 and eighth branch 208. When the devices in the first traction substation unit 1 are normally powered, the circuit breaker 9 is opened to cut off the electrical connection between the two groups of busbars, so as to ensure that the other group of devices will not be affected when one group of devices is struck by lightning.

[0045] The above-mentioned busbars are single busbars or single busbars with sectionalized wiring. Figures 2 to 4 They are all structures in which the busbars are divided into two sections, but are not limited to the structure of being divided into two sections. Figure 5 The structure in which the busbars are divided into three sections is given. The busbars included in the present invention are single busbars or busbars divided into several sections.

[0046] It is easy for those skilled in the art to understand that the above description is only a preferred embodiment of the present invention and is not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A main wiring structure of a hub traction substation, comprising two external power supplies and two groups of traction transformers, characterized in that, It also includes a changeover switch unit, several feedback lines, a first set of buses and a second set of buses that are independently arranged. The first set of buses is powered by one external power source and one set of traction transformers, and the second set of buses is powered by another external power source and one set of traction transformers to form two independent power supply devices that are physically isolated and electrically separated from each other; Each set of the buses has a single-bus or single-bus sectionalized wiring structure. The number of sections of the two sets of buses is the same, and each section of the first set of buses is arranged in one-to-one correspondence with each section of the second set of buses. A bus coupler is provided between each corresponding section of the first set of buses and the second set of buses; a circuit breaker and a disconnecting switch are provided on each bus coupler; Each set of buses is configured with the same number of feeder lines. The feeder lines of the second set of buses are arranged in one-to-one correspondence with the feeder lines of the first set of buses. The corresponding feeder lines in the two sets of buses are combined into one outgoing feeder line. A switch is provided on each feedback line of the two sets of buses, and a switch is also provided on each outgoing feeder line to realize the switching between the two sets of buses through the switches; The first set of buses includes a first bus (103) and a second bus (104), and the second set of buses includes a third bus (203) and a fourth bus (204). The first bus (103) is connected with a fifth feeder line (301) and a seventh feeder line (401), the second bus (104) is connected with a ninth feeder line (501) and an eleventh feeder line (601), the third bus (203) is connected with a sixth feeder line (302) and an eighth feeder line (402), and the fourth bus (204) is connected with a tenth feeder line (502) and a twelfth feeder line (602); The fifth feeder line (301) and the sixth feeder line (302) are connected to the first feeder line (3), the seventh feeder line (401) and the eighth feeder line (402) are connected to the second feeder line (4), the ninth feeder line (501) and the tenth feeder line (502) are connected to the third feeder line (5), and the eleventh feeder line (601) and the twelfth feeder line (602) are connected to the fourth feeder line (6).

2. The main wiring structure of a hub traction substation according to claim 1, characterized in that, Each set of the traction transformers respectively leads one power source to each section of the two sets of buses.

3. A main wiring structure of a hub traction substation according to any one of claims 1 to 2, characterized in that, A circuit breaker is provided on the loop where each set of transformers supplies power to each section of the buses.

4. The main wiring structure of a hub traction substation according to claim 3, characterized in that, The changeover switch unit is arranged inside the traction substation or on the catenary.

5. The main wiring structure of a hub traction substation according to claim 4, characterized in that, Each set of the traction transformers adopts single-phase connection, three-phase V / v or V / x connection or three-phase-two-phase balance connection.

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