WO2013041010A1

WO2013041010A1 - Traction power supply system able to realize separation of up/downlink power supply arms to supply power in the manner of at

Info

Publication number: WO2013041010A1
Application number: PCT/CN2012/081525
Authority: WO
Inventors: 余家华; 张北斗; 罗利平; 潘卫国; 包大发; 易震启
Original assignee: 上海知和电器设备有限公司
Priority date: 2011-09-19
Filing date: 2012-09-18
Publication date: 2013-03-28
Also published as: CN102390290B; CN102390290A

Abstract

A traction power supply system able to realize separation of up/downlink power supply arms to supply power in the manner of AT, including a traction substation disposed on one side of an electrified railway, the output side of the traction substation being connected to an up/downlink traction grid which respectively includes a contact suspension T line and a positive feeder F line; parallel equipment having a parallel power supply function being provided in the middle of and at the end of a power supply arm in the up/downlink traction grid, the parallel equipment being connected to AT equipment and, in a parallel power supply modular appliance, a first uplink parallel branch being in series with a first downlink parallel branch, a second uplink parallel branch being in series with a second downlink parallel branch, a first bus segmentation branch separation switch being provided between the first uplink parallel branch and the first downlink parallel branch, and a second bus segmentation branch separation switch being provided between the second uplink parallel branch and the second downlink parallel branch. The present invention can effectively meet the requirements that the up/downlink power supply arms are separated and supply power in the manner of AT simultaneously, with good power supply quality and high reliability.

Description

It can realize the power supply of the upper and lower power supply arms separately according to AT mode.

[Technical Field] The present invention relates to a traction power supply system for an electrified railway AT power supply system. [Background Art] Many domestic and international high-speed railways, passenger dedicated lines, heavy-duty and other electrified railway traction power supply systems mainly use AT power supply mode with a nominal voltage of 2X25kV and a long-term maximum voltage of 2X27.5kV to meet the needs of electric locomotive traction. The traction power supply system of the AT power supply mode mainly adopts the parallel power supply mode consisting of the traction substation, the AT partition, the AT, and the traction network as shown in FIG. 1 , passing through the AT in the middle of the power supply arm, and passing through the AT partition at the end; Or by using the traction substation, the parallel power supply unit, the crossover power supply unit, the integrated AT, and the traction network as shown in Fig. 2, the parallel power supply through the parallel power supply unit and the integrated AT in the middle and the end of the power supply arm the way. The traction power supply system of the above two power supply modes has a small impedance of the traction network, which can reduce the voltage loss of the traction network and improve the power supply quality. The AT partitioning unit of AT power supply mode and the 2X27.5kV equipment of AT are mainly used in the user's GIS inflatable switchgear, and other single equipment layout is also adopted. The parallel power supply unit of the AT power supply mode, the cross-section power supply unit, and the integrated AT 2X27.5kV equipment shown in Figure 2 mainly use 2X27.5kV outdoor modular appliances.

1. Insufficient AT power supply mode shown in Figure 1.

(1) When the AT is in the normal operation of the AT power supply mode shown in Figure 1, the circuit breaker 1DL and the isolating switch 1G are closed, the 2DL and the isolating switch 2G Closing, the upper and lower power supply arms supplied by the A traction substation are connected in parallel with the power supply arm through 1DL, 1G and 2DL, 2G; when the upper (or lower) power supply arm fails, 1DL, 2DL have no delay. The brake, the feeder circuit breaker of the traction substation is opened, and the fault is removed. After the fault is removed, the automatic reclosing of the feeder circuit breaker of the traction substation starts and closes, and the power is again transmitted to the traction network. If the fault is a non-permanent fault and the reclosing is successful, the 1DL and 2DL are respectively checked for a closed switch to restore the parallel power supply. If the fault is a permanent fault, after the feeder circuit breaker of the substation is pulled, the fault is broken and the fault line is cut off. At this time, 1DL and 2DL continue to maintain the open state, and then the faulty line is restored to normal and then closed respectively to resume parallel power supply. The circuit breaker 3DL and the isolating switch 3G and the self-tapping transformer ΑΠ are interlocked with the circuit breaker 4DL and the isolating switch 4G and the self-transferring transformer AT2, and cannot be simultaneously input, and are mutually fixed and standby. In normal operation, 3DL and 3G are closed and ΑΠ is powered. When ΑΠ fails, 3DL opens, ΑΠ exits, the standby device starts, 4DL and 4G automatically close, and AT2 is put into operation. According to the operation mode of the existing AT: Since the 2 X 27. 5kV bus between the two parallel power supply breakers 1DL and 2DL in the AT has no segmentation equipment; and the two self-transformers ATI and AT2 are fixed each other. , can only be invested separately. Therefore, when the upper and lower power supply arms need to be operated separately, the requirements of the two self-turning transformers respectively connecting the upper and lower power supply arms cannot be realized, that is, the requirements of the upper and lower power supply arms being separated and simultaneously supplied by the AT mode cannot be satisfied. .

(2) When the AT power supply mode shown in Figure 1 is insufficient for normal operation, the isolating switches 11G and 21G are opened; the circuit breaker 1DL and the isolating switch 1G, the circuit breaker 3DL and the isolating switch 3G are closed, and the traction is changed. The upper and lower power supply arms of the power supply are connected in parallel at the end of the power supply arm through 1DL and 1G and 3DL and 3G; when the upper (or lower) power supply arm fails, 1DL, 3DL have no delay to open, and the traction substation feeder The circuit breaker is opened and the fault is removed. After the fault is removed, The automatic reclosing of the feeder circuit breaker of the traction substation starts and closes, and the power is again transmitted to the traction network. If the fault is a non-permanent fault and the reclosing is successful, the 1DL and 3DL respectively detect the closing and resuming the parallel power supply. If the fault is a permanent fault, the feeder circuit breaker of the substation will be accelerated and the fault line will be cut off. At this time, 1DL and 3DL will continue to be in the open state. After the faulty line returns to normal, it will be closed separately to restore the parallel power supply. Similarly, the upper and lower power supply arms supplied by the B traction substation are connected in parallel with the ends of the power supply arm through 2DL and 2G and 4DL and 4G. The circuit breaker 5DL and the isolating switch 5G and the self-transferring transformer ΑΠ are interlocked with the circuit breaker 7DL and the isolating switch 7G and the self-transferring transformer AT3, and cannot be simultaneously input, and are mutually fixed and standby. In normal operation, 5DL and 5G are closed and ΑΠ is powered. When ΑΠ fails, 5DL opens, ΑΠ exits, the standby device starts, 7DL and 7G automatically close, and AT3 is put into operation. Similarly, AT2 and AT4 cannot be input at the same time, and they are fixed standby. When the A traction substation exits for some reason, the isolating switch 11G and the isolating switch 21G are closed, and the B traction substation supplies power to the upper and lower power supply arms of the armored substation through 11G and 21G. On the other hand, when the B traction substation fails, the A traction substation also realizes the cross-region power supply through 11G and 21G. It can be seen that 1DL, 3DL, 5DL, 7DL, AT1, AT3 and 2DL, 4DL, 6DL, 8DL, AT2, and AT4 respectively constitute two existing ATs. In normal operation, they do not have direct electrical connection in the operation mode. Only when the cross-region power supply is required, the 11G and 21G are connected to realize the cross-region power supply function. Therefore, we can think that the existing AT partition consists of two existing ATs and a cross-section power disconnect switch. From the operation of the existing AT partition, it is known that there are no segmentation devices for the 2 X 27. 5kV bus between the two parallel power supply breakers 1DL and 3DL (or 2DL and 4DL) in the AT partition; and, two The ATI and AT3 transformers (or AT2 and AT4) are fixed and standby, and can only be used separately. Therefore, when the upper and lower power supply arms need to be operated separately, the requirements of the two self-turning transformers respectively connecting the upper and lower power supply arms cannot be realized, that is, the requirements of the upper and lower power supply arms being separated and simultaneously supplied by the AT mode cannot be satisfied. .

(3) When a permanent fault occurs in the contact network, the power supply arm where the fault contact network is located can only be completely powered off, which seriously affects the need for driving power. When a permanent fault occurs in the uplink contact network, the circuit breaker 1DL connected to the fault contact network in the AT is opened, the circuit breaker 2DL connected to the non-fault contact network is closed, and the self-transformer transformer (or ΑΤ2) is put into operation; The circuit breaker 1DL connected to the fault contact network in the AT partition is opened, the circuit breaker 3DL connected to the non-fault contact network is closed, the self-transformer transformer (or ΑΤ2) is put into operation; the downlink power supply arm where the non-fault contact network is located Power is supplied by AT. The upstream power supply arm where the fault contact network is located can only be completely powered off, and the power outage range is large, which seriously affects the need for driving power. Similarly, when a permanent fault occurs in the downlink contact network, the upstream power supply arm can be powered by AT, and the downstream power supply arm can only be powered down.

(4) When the upper and lower power supply arms are separated and at the same time, at least one power supply arm is directly powered. In the power supply mode shown in Figure 1, when the parallel circuit breaker connected to the uplink contact network in the AT and AT sections is simultaneously opened The upper and lower power supply arms can be separately powered simultaneously. However, at this time, since the self-twisting transformer cannot be put into operation due to the disconnection of the parallel circuit breaker connected to the uplink contact network in the AT and the AT partition, the actual power supply mode of the uplink contact network is the direct power supply mode instead of the AT power supply mode. At this time, the parallel circuit breaker connected to the downlink contact network in the AT and the AT partition can be closed at the same time, and the self-turning transformer can only be connected to the downlink contact network and put into operation, and the downlink contact network is powered by the AT mode. Similarly, AT When the parallel circuit breaker connected to the downlink contact network in the AT partition is simultaneously opened, the uplink and the downlink can be separated and supplied simultaneously. However, although the uplink contact network is powered by the AT mode, the downlink contact network can only be pressed. Direct power supply. That is to say, when the upper and lower power supply arms are separately powered at the same time, at most one power supply arm can be powered by the AT mode, and the other can only be powered by the direct power supply mode. When the parallel circuit breakers of the AT and AT sections are simultaneously opened, the upper and lower sections can also be separated and supplied simultaneously. However, since the self-twisting transformer cannot be put into operation due to the parallel circuit breaker opening, the actual power supply mode of the contact network is the direct power supply mode instead of the AT power supply mode. Therefore, at least one power supply arm is directly powered when the upper and lower power supply arms are separately powered, and the power supply quality is poor, which cannot meet the needs of high-speed, heavy-duty driving power.

2. The shortage of AT power supply mode shown in Figure 2

(1) It is not possible to meet the requirements of the upper and lower power supply arms and the power supply according to the AT mode. A traction substation supplies power to the upper and lower power supply arms through the internal feeder circuit breaker, and the upper and lower power supply arms are powered by the first parallel power supply unit 101. The arms are connected in parallel in the middle, and the parallel power supply is realized by the second parallel power supply unit 102. When the upper (or) downstream power supply arm fails, the four circuit breakers of the first parallel power supply unit 101 and the second parallel power supply unit 102 are tripped without delay, and the traction transformer substation circuit breaker is opened to clear the fault. After the fault is removed, the automatic reclosing of the feeder circuit breaker of the traction substation starts and closes, and the power is again transmitted to the traction network. If the fault is a non-permanent fault and the reclosing is successful, the four circuit breakers in the first parallel power supply unit 101 and the second parallel power supply unit 102 respectively detect a closed switch to restore the parallel power supply. If the fault is a permanent fault, the traction breaker is tripped after the feeder circuit breaker, and the faulty line is cut off. At this time, the four circuit breakers in the first parallel power supply unit 101 and the second parallel power supply unit 102 continue to maintain the open state. After the faulty line returns to normal, it will be closed separately to restore parallel power supply. Similarly, the upper and lower power supply arms supplied by the B traction substation are also passed through the third parallel power supply unit.

103 (or the fourth parallel power supply unit 104) realizes parallel supply of power in the middle (or end) of the power supply arm. When the A traction power substation exits for any reason, the first crossover power supply unit 201 (or the second crossover power supply unit 202) is closed, and the B traction substation is pulled by the crossover power supply unit 201 (or 202). The upper (or lower) row of the substation supplies power to the zone. Conversely, when the B traction substation fails, the A traction substation also supplies power through the crossover power supply unit 201 (or 202). From the operating mode shown in Figure 2, the 2 X 27. 5kV bus between the two circuit breakers of the parallel power supply unit (101, 102, 103, 104) has no segmentation equipment; the integrated AT (301, 302) The 2 X 27. 5kV busbar between the two circuit breakers in 303, 304) also has no segmentation equipment. The two self-turning transformers are also fixed and standby, and can only be put into operation separately. Therefore, when the upper and lower power supply arms need to be operated separately, the requirements of the two self-turning transformers respectively connecting the upper and lower power supply arms cannot be realized, that is, the power supply mode shown in FIG. 2 cannot satisfy the upper and lower power supply arms. Separate the requirements for power supply by AT at the same time.

(2) When a permanent fault occurs in the contact network, the power supply arm where the fault contact network is located can only be completely powered off, which seriously affects the need for driving power. When a permanent fault occurs in the uplink contact network, the circuit breaker 1DL connected to the fault contact network in the first parallel power supply unit 101 and the second parallel power supply unit 102 is opened, and the circuit breaker 2DL connected to the non-fault contact network is closed; The self-transformer transformer ΑΠ (or ΑΤ2) in the first integrated AT 301 and the self-transformer ATI (or AT2) in the second integrated AT 302 are put into operation, and the downlink power supply arm where the non-fault contact network is located is in the AT mode. Power supply, and the upstream power supply arm where the fault contact network is located can only be powered off completely, and the power outage range is large, which seriously affects the need for driving power. Similarly, when a permanent fault occurs in the downlink contact network, the upstream power supply arm can be powered by AT, and The downlink power supply arm can only be powered off.

(3) At least one power supply arm is a direct power supply mode when the upper and lower power supply arms are separately powered. In the power supply mode shown in FIG. 2, the parallel connection of the first parallel power supply unit 101 and the second parallel power supply unit 102 to the uplink contact network is connected. When the circuit breaker 1DL is opened at the same time, the upper and lower sides can be separated and supplied simultaneously. However, at this time, since the self-twisting transformer cannot be put into operation due to the parallel circuit breaker 1DL connected to the uplink contact network in the first parallel power supply unit 101 and the second parallel power supply unit 102, the actual power supply mode of the uplink contact network is direct power supply. The way, not the AT power supply. At this time, the parallel circuit breaker 2DL connected to the downlink contact network in the first parallel power supply unit 101 and the second parallel power supply unit 102 can be simultaneously closed, and the self-turning transformer can only be connected to the downlink contact network, and is put into operation, and the downlink contact network is pressed. AT mode power supply. Similarly, when the parallel circuit breaker 2DL connected to the downlink contact network in the first parallel power supply unit 101 and the second parallel power supply unit 102 is simultaneously opened, the power supply can be simultaneously and simultaneously separated, but the uplink contact network is pressed at this time. The AT mode supplies power, but the downlink contact network can only be powered by direct power. That is to say, when the upper and lower power supply arms are separately powered, only one power supply arm can be used for the AT power supply mode, and the other is the direct power supply mode. When the parallel circuit breakers in the first parallel power supply unit 101 and the second parallel power supply unit 102 are simultaneously opened, it is also possible to realize simultaneous power supply by the uplink and the downlink. However, since the self-twisting transformer cannot be put into operation due to the parallel circuit breaker opening, the actual power supply mode of the contact network is the direct power supply mode instead of the AT power supply mode. Therefore, at least one power supply arm is directly powered when the upper and lower power supply arms are separately powered, and the power supply quality is poor, which cannot meet the needs of high-speed, heavy-duty driving power. In summary, neither the power supply mode shown in Figure 1 nor Figure 2 can satisfy the upper and lower supply. When the arm is separated and the AT mode is used for power supply; and when the upper (or lower) contact network is permanently faulty, the lower (or upper) line of the power supply arm where the non-fault contact network is located can be powered by AT, but The power supply arm of the upper (or lower) row where the fault contact network is located can only be completely powered off, and the power failure range is large, which seriously affects the power supply of the vehicle. Although the parallel circuit breaker part is opened, it can realize the simultaneous power supply requirements of the upper and the lower part, but at least one power supply arm is the direct power supply mode at this time; and all the gates can also realize the simultaneous power supply of the upper and the lower side, but at this time, The actual power supply mode of the upper and lower power supply arms is the direct power supply mode, not the AT power supply mode. Therefore, when the upper and lower power supply arms are separated and at the same time, at least one power supply arm is directly powered, the power supply quality is poor, and the high-speed and heavy-duty operation power needs cannot be met.

[Invention] In order to overcome the shortcomings of the existing electrified railway traction power supply system AT power supply mode that can not meet the requirements of the upper and lower power supply arms being separated and simultaneously powered by the AT mode, the power supply quality is poor, and the reliability is poor, the present invention provides a good power supply quality. High reliability, can effectively meet the traction power supply system of the upper and lower power supply arms and the AT mode. The technical solution adopted by the present invention to solve the technical problem thereof is as follows: A traction power supply system capable of realizing the power supply of the upper and lower power supply arms separately according to the AT mode, comprising a traction substation disposed on the side of the electrified railway, the traction and transformation The output side is connected to the upper/downward traction net, and the upper/downward traction nets respectively comprise a contact suspension T line and a positive feed line F line, and parallel devices with parallel power supply functions are arranged at the middle and the end of the power supply arm of the upper/downward traction network. Provided in the middle of the power supply arm of the upper/downward traction network with an electrical segment having an electrical segmentation function of the catenary and an isolating switch in parallel with the electrical segment, on two adjacent traction substations/ Electrical division between the power supply arms of the downlink traction network The cross-connected device is connected to the AT device, wherein the parallel device includes a first parallel power supply unit, a second parallel power supply unit, a third parallel power supply unit, and a fourth parallel power supply. The unit device includes a first handover power supply unit and a second handover power supply unit; the AT device includes a first integrated AT, a second integrated AT, a third integrated AT, and a fourth In the integrated AT, the first parallel power supply unit is connected to the first integrated AT, the second parallel power supply unit is connected to the second integrated AT, and the third parallel power supply unit is connected to the first a third integrated power supply unit, wherein the fourth parallel power supply unit is connected to the fourth integrated AT; the first parallel power supply unit, the second parallel power supply unit, the third parallel power supply unit, and the fourth parallel power supply unit are connected in parallel The modular electrical appliance for power supply, the modular electrical appliance for parallel power supply includes an uplink first input end, an uplink second input end, a downlink first input end, and a downlink second input end, The uplink first input end and the uplink second input end are respectively connected to the T line and the F line of the uplink traction network, and the downlink first input end and the downlink second input end are connected to the T line and the F of the downlink traction network. The wired connection comprises: a bracket, an ascending parallel electronic supply unit mounted on the bracket, a downlink parallel electronic supply unit, a busbar segmentation subunit, a parallel power supply control box and a parallel power supply box, the uplink parallel connection The power supply unit includes an uplink parallel first branch and an uplink parallel second branch, and the downlink parallel electronic supply unit includes a downlink parallel first branch and a downlink parallel second branch, and the bus segment subunit includes a first branch a road isolation switch and a second branch isolation switch; the uplink parallel first branch and the downlink parallel first branch are connected in series, the uplink parallel second branch and the downlink parallel second branch are connected in series, the uplink parallel connection The first branch isolation switch is disposed between a road and the first branch connected in parallel, and the upstream branch parallel second branch and the downstream parallel second branch are disposed between Two bypass isolation switch; The two ends of the first branch isolation switch are respectively connected with the uplink T input end and the downlink T input end of the integrated AT corresponding to the parallel power supply unit, and the two ends of the second branch isolation switch respectively correspond to Connected to the uplink F input terminal and the downlink F input terminal of the integrated AT of the parallel power supply unit; the integrated AT includes an uplink AT transformer, a downlink AT transformer, a modular electrical device for the uplink AT, and a modular electrical device for the downlink AT. The modular electrical appliance used by the uplink AT includes an uplink T input terminal and an uplink F input terminal, and the modular electrical appliance used by the downlink AT includes a downlink T input terminal and a downlink F input terminal, and the modular electrical appliance and the uplink AT used by the uplink AT Transformer connection, the modular electrical appliance used in the downlink AT is connected to the downlink AT transformer, the grounding end of the uplink AT transformer and the downstream AT transformer is connected to the return line and the grounding network, and a firewall is arranged between the uplink AT transformer and the downlink AT transformer The modular electrical appliance used in the uplink AT and the modular electrical appliance used in the downstream AT use the modular electrical appliance used by the AT, the AT The modular electrical appliance comprises a bracket, a first branch of the T line installed on the bracket and a first branch of the F line; the first branch of the T line includes a first circuit breaker of the T line, a first current transformer of the T line, a first isolation switch of the T line and a first voltage transformer and a fuse of the T line, the first circuit breaker of the T line, the first current transformer of the T line, and the first isolation switch of the T line are connected in series, the first voltage of the T line a transformer and a fuse are connected in series, an input end of the first fuse of the T line is connected to the input end of the T line, and an output end of the first circuit breaker of the T line is connected to the input end of the first AT transformer T line; The first branch of the line includes an F-line first circuit breaker, an F-line first current transformer, an F-line first isolation switch, and an F-line first micro-transformer and a fuse, and the F-line first circuit breaker and the F-line A current transformer, an F-line first isolating switch is connected in series, and the F-line first micro-transformer and the fuse are connected in series, F An input end of the line first fuse is connected to the F line input end, and an output end of the F line first circuit breaker is connected to the F line input end of the first AT transformer; the T line first current transformer, T The line first voltage transformer, the F line first current transformer, and the F line first micro transformer are all connected with the integrated AT outdoor prefabricated protection measuring and controlling cabinet. Further, an electrical segment having an electrical segmentation function of the catenary and an isolating switch in parallel with the electrical segment are provided in the middle of the power supply arm of the upper/downstream traction network. When a permanent failure occurs in the catenary, the upper (or lower) row of power supply arm of the fault may be powered off in sections. Still further, an electrical segment and an isolating switch in parallel with the electrical segment are respectively disposed on both sides of the contact net at the junction with the parallel device. Further, the uplink parallel first branch includes a parallel power supply uplink first isolation switch, a parallel power supply uplink first current transformer, a parallel power supply uplink first circuit breaker, and a parallel power supply uplink first voltage transformer and a fuse. The parallel power supply uplink first isolation switch, the parallel power supply uplink first current transformer, and the parallel power supply uplink first circuit breaker are connected in series, the parallel power supply uplink first voltage transformer and the fuse are connected in series, and the input terminal of the first first fuse is connected Connecting an uplink first input end of the parallel power supply modular electrical device; the downlink parallel first branch circuit includes a parallel power supply downlink first isolation switch, a parallel power supply downlink first current transformer, and a parallel power supply downlink first circuit breaker and The first voltage transformer and the fuse are connected in parallel, the parallel isolation power supply first isolation switch, the parallel power supply downlink first current transformer, and the parallel power supply downlink first circuit breaker are connected in series, and the parallel power supply downlink first voltage transformer In series with the fuse, the input end of the downstream first fuse is connected to the parallel power supply mode a downstream first input of the block appliance; The uplink parallel parallel second branch includes a parallel power supply uplink second isolation switch, a parallel power supply uplink second current transformer, a parallel power supply uplink second circuit breaker, and a parallel power supply uplink second micro transformer and a fuse, and the parallel power supply uplink a second isolation switch, a parallel power supply uplink second current transformer, a parallel power supply uplink second circuit breaker are connected in series, the parallel power supply uplink second micro transformer and a fuse are connected in series, and an input terminal of the uplink second fuse is connected to the parallel power supply The second input end of the modular electric appliance; the second parallel branch of the downlink parallel connection includes a parallel second power supply downstream switch, a parallel power supply downlink second current transformer, a parallel power supply downlink second circuit breaker, and a parallel power supply downlink second a micro-transformer and a fuse, the parallel power supply downlink second isolation switch, the parallel power supply downlink second current transformer, the parallel power supply downlink second circuit breaker are connected in series, the parallel power supply downlink second micro-transformer and the fuse are connected in series, the downlink The input end of the two fuses is connected to the modular electric appliance for parallel power supply a second input terminal; the parallel current supply upstream first current transformer and the parallel power supply uplink first voltage transformer, the parallel power supply downlink first current transformer and the parallel power supply downlink first voltage transformer, and the parallel power supply uplink second current The secondary output end of the transformer and the parallel power supply downstream second current transformer are connected with the parallel power supply control box, and the parallel output of the second micro-transformer and the parallel output of the second micro-transformer are connected to the parallel connection. Power supply box; The voltage detection signal of the parallel parallel second branch and the downstream parallel second branch of the parallel power supply control box is drawn from the parallel power supply box. The beneficial effects of the present invention are mainly manifested in: effectively realizing the upper and lower power supply arms to be separated and simultaneously supplied by the AT mode, the power supply quality is good and the reliability is good; and, when the contact network is permanently faulty, the upper (or lower) line of the fault is located. The power supply arm can be powered off in sections.

[Description of the Drawings] Figure 1 shows the current AT power supply mode, the downlink power supply arm passes through the AT, and the end passes the AT point. Schematic diagram of parallel power supply in the district. Figure 2 is an electrical schematic diagram of an AT power supply with 2 X 27. 5kV outdoor modular appliances. Figure 3 is an electrical schematic diagram of an AT power supply mode that allows the upper and lower power supply arms to be separated and simultaneously powered by the AT mode. Figure 4 is a schematic diagram of the modular electrical system of a parallel power supply unit that satisfies the power supply of the upper and lower sections and the power supply arm section power failure. FIG. 5 is a structural diagram of a modular electrical device that satisfies the parallel power supply unit of the upper and lower divided power supply and the power supply arm sectional power failure. Figure 6 is a schematic diagram of the main wiring of the integrated AT that satisfies the power supply of the upper and lower sections and the power supply arm section power failure. Figure 7 is a schematic diagram of the structure of the AT module of the integrated AT. Figure 8 is a general plan layout of an integrated AT that satisfies the power supply of the upper and lower sections and the power supply arm section power failure.

DETAILED DESCRIPTION OF THE INVENTION The present invention will be further described below in conjunction with the accompanying drawings.

Referring to FIG. 3 to FIG. 8, a traction power supply system capable of separately supplying power to the upper and lower power supply arms according to the AT mode includes a traction substation disposed on the side of the electrified railway, and the output side of the traction substation is connected / downlink traction network, the upper/downward traction network respectively comprises a contact suspension T line and a positive feeder F line, and a parallel device with parallel power supply function is arranged in the middle and the end of the power supply arm of the upper/downward traction network, a cross-section device having a cross-over power supply function is provided at an electrical sub-phase between the power supply arms of the upper/downstream traction nets of two adjacent traction substations, wherein the parallel device is connected to the AT device, wherein

The parallel device includes a first parallel power supply unit 101, a second parallel power supply unit 102, a third parallel power supply unit 103, and a fourth parallel power supply unit 104; the handover device includes a first handover power supply unit 201 and a second The power supply unit 202; the AT device includes a first integrated AT 301, a second integrated AT 302, a third integrated AT 303, and a fourth integrated AT 304, the first parallel power supply unit 101. Connecting the first integrated AT 301, the second parallel power supply unit 102 is connected to the second integrated AT 302, and the third parallel power supply unit 103 is connected to the third integrated AT 303. The fourth parallel power supply unit 104 is connected to the fourth integrated AT station 304;

The first parallel power supply unit, the second parallel power supply unit, the third parallel power supply unit, and the fourth parallel power supply unit are parallel electrical power supply modular electrical appliances, and the parallel power supply modular electrical appliance includes an uplink first input end, and an uplink first a second input end, a downlink first input end, and a second downlink input end, wherein the uplink first input end and the uplink second input end are respectively connected to the T line and the F line of the uplink traction network, and the downlink first input The second input end and the second input end are connected to the T line and the F line of the downlink traction network;

The modular electric appliance for parallel power supply comprises a bracket, an upstream parallel electronic supply unit 11 mounted on the bracket, a downstream parallel electronic supply unit 12, a busbar segmentation subunit 13, a parallel power supply control box and a parallel power supply box, and the uplink parallel connection The power supply unit 11 includes an uplink parallel first branch and an uplink parallel second branch, and the downlink parallel supply electronic unit 12 includes a downlink parallel first branch and a downlink parallel second branch, and the bus segment sub-unit 13 includes a first branch isolation switch and a second branch isolation switch; the upstream parallel first branch and the downstream parallel first branch are connected in series, the uplink parallel second branch and the downlink parallel second branch are connected in series, A first branch isolation switch of the busbar segmentation unit is arranged between the upstream parallel first branch and the downstream parallel first branch, the uplink parallel second branch and the downstream parallel second branch A second branch isolation switch of the busbar segmentation unit is arranged between the roads;

The two ends of the first branch isolation switch are respectively connected with the uplink T input end and the downlink T input end of the integrated AT corresponding to the parallel power supply unit, and the two ends of the second branch isolation switch respectively correspond to Connected to the uplink F input terminal and the downlink F input terminal of the integrated AT of the parallel power supply unit; the integrated AT includes an uplink AT transformer, a downlink AT transformer, a modular electrical device for the uplink AT, and a modular electrical device for the downlink AT. The modular electrical appliance used by the uplink AT includes an uplink T input terminal and an uplink F input terminal, and the modular electrical appliance used by the downlink AT includes a downlink T input terminal and a downlink F input terminal, and the modular electrical appliance and the uplink AT used by the uplink AT Transformer connection, the modular electrical appliance used in the downlink AT is connected to the downlink AT transformer, the grounding end of the uplink AT transformer and the downstream AT transformer is connected to the return line and the grounding network, and a firewall is set between the upstream AT transformer and the downstream AT transformer. ;

The modular electrical appliances used in the uplink AT and the modular electrical appliances used in the downstream AT use the modular electrical appliances used by the AT, and the modular electrical appliances used in the AT include the bracket, the first branch of the T-line installed on the bracket, and the first branch of the F-line. Road

The first branch of the T line includes a T-line first circuit breaker, a T-line first current transformer, a T-line first isolation switch, and a T-line first voltage transformer and a fuse, and the T-line first circuit breaker a T-line first current transformer, a T-line first isolating switch connected in series, the T-line first voltage transformer and the fuse are connected in series, and an input end of the T-wire first fuse is connected to the T-line input end, The output end of the first circuit breaker of the T line is connected to the T line input end of the first AT transformer;

The F-line first branch includes an F-line first circuit breaker, an F-line first current transformer, an F-line first isolation switch, and an F-line first micro-transformer and a fuse, the F-line first circuit breaker, The F line first current transformer and the F line first isolating switch are connected in series, the F line first micro transformer and the fuse are connected in series, and the input end of the F line first fuse is connected to the F line input end, the F line Output of the first circuit breaker Connecting the first AT transformer F line input terminal;

The T line first current transformer, the T line first voltage transformer, the F line first current transformer, and the F line first micro transformer are all connected with the integrated AT outdoor prefabricated protection measuring and controlling cabinet.

An electrical segment having an electrical segmentation function for the catenary and an isolating switch in parallel with the electrical segment are provided in the middle of the power supply arm of the upstream/downstream traction network. When a permanent failure occurs in the contact network, the upper (or lower) power supply arm of the fault may be powered off in sections.

Preferably, an electrical segment and an isolating switch in parallel with the electrical segment are provided on each side of the catenary at the junction with the parallel device.

The upstream parallel first branch includes a parallel power supply uplink first isolation switch, a parallel power supply uplink first current transformer, a parallel power supply uplink first circuit breaker, and a parallel power supply uplink first voltage transformer and a fuse, and the parallel power supply The first isolation switch, the parallel power supply uplink first current transformer, and the parallel power supply uplink first circuit breaker are connected in series, the parallel power supply uplink first voltage transformer and the fuse are connected in series, and the input end of the uplink first fuse is connected to the The first input end of the parallel electrical power supply modular electrical appliance; the downstream parallel first branch comprises a parallel power supply downlink first isolation switch, a parallel power supply downlink first current transformer, a parallel power supply downlink first circuit breaker and a parallel power supply downlink a first voltage transformer and a fuse, the parallel power supply downlink first isolation switch, the parallel power supply downlink first current transformer, and the parallel power supply downlink first circuit breaker are connected in series, and the parallel power supply downlink first voltage transformer and fuse Connected in series, the input end of the downstream first fuse is connected to the parallel electrical power supply modular electrical appliance The first input terminal of the uplink; the second branch of the uplink parallel connection includes a parallel second power supply upstream isolation switch, a parallel power supply uplink second current transformer, a parallel power supply uplink second circuit breaker, and a parallel power supply uplink second miniature transformer and a fuse The parallel power supply uplink second isolation switch, the parallel power supply uplink second current transformer, the parallel power supply uplink second circuit breaker are connected in series, the parallel power supply uplink second micro transformer and the fuse are connected in series, and the uplink second fuse input Connecting an uplink second input end of the parallel electrical power supply modular electrical appliance; The downstream parallel second branch includes a parallel power supply downlink second isolation switch, a parallel power supply downlink second current transformer, a parallel power supply downlink second circuit breaker, and a parallel power supply downlink second electrical micro transformer and a fuse, the parallel power supply a second isolation switch, a parallel current supply, a second current transformer, and a parallel power supply, the second circuit breaker are connected in series, the parallel power supply is connected to the second micro-transformer and the fuse is connected in series, and the input end of the downlink second fuse is connected to the parallel a downstream input terminal of the modular electrical appliance for power supply; a first current transformer connected in parallel and an upstream first voltage transformer connected in parallel, a first current transformer connected in parallel, and a first voltage transformer connected in parallel, Parallel power supply, second current transformer, parallel power supply, second output of the second current transformer are connected to the parallel power supply control box, and the parallel power supply is connected to the second micro-transformer, and the parallel power supply is connected to the second micro-transformer. The output terminal is connected to the parallel power supply box; the parallel power supply control box is The second parallel branch and a second branch connected in parallel with a downstream pressure detection signal from the lead in parallel with the power supply box.

The first and second regional power supply units 201 and 202 are both modular electrical appliances for cross-over power supply, and the modular electrical appliances for cross-region power supply include a first input terminal and a second input terminal. The cross-region first output end and the cross-region second output end, the cross-region power supply modular electric appliance comprises a bracket, a cross-section first branch road installed on the bracket, a cross-section second branch road, a cross-section control box and Crossover power box;

The first branch of the crossing includes a first left side isolation switch, a first circuit breaker, a first current transformer, a first right side isolation switch, and a first left side micro transformer. And a fuse, a first right side micro-transformer and a fuse, a first first left side switch, a first circuit breaker, a first current transformer, and a first right side switch In series, the first left side micro-transformer and the fuse are connected in series, the input end of the first first left fuse is connected to the first input end of the cross, the first right micro-transformer and the fuse are broken Connected in series, the input end of the first right side fuse of the cross section is connected to the first output end of the cross section;

The second branch of the crossing includes a second left side disconnecting switch, a second circuit breaker in the crossing area, and a crossing area Two current transformers, a second right side isolating switch, a second left side voltage transformer and a fuse, a second right side voltage transformer and a fuse, and a second left side isolating switch a second circuit breaker in the area, a second current transformer in the area, and a second right side isolation switch in the cross zone, wherein the second left side voltage transformer and the fuse are connected in series, and the second left side fuse is crossed The input terminal is connected to the second input terminal of the fault, the second right voltage transformer of the fault is connected in series with the fuse, and the input end of the second right fuse of the fault is connected to the second output end of the fault;

The cross-sectional control box is connected to the secondary output of the first current transformer, the second current transformer, the second left voltage transformer, and the second right voltage transformer of the cross zone, The second output terminal of the first left side micro-transformer and the first right side micro-transformer of the cross-section are connected to the cross-section power supply box; the voltage of the left side and the right side of the first branch of the cross-section control box The detection signal is drawn from the crossover power box.

The intermediate and terminal parallel power supply unit of the embodiment is composed of an upstream parallel electronic power supply unit 11 connected to the upstream traction network, a downstream parallel electronic power supply unit 12 connected to the downlink traction network, and an upstream parallel electronic supply unit 11 and a downstream parallel electronic supply unit 12. The connected 2 X 27.5 kV bus segment sub-unit 13 is composed of the upstream parallel parallel supply first branch of the electronic unit 11 , the first branch isolation switch of the bus segment sub-unit 13 , and the downstream parallel electronic supply unit 12 . Downstream paralleling the first branch in series, the upstream parallel parallel supply second unit of the electronic unit 11 , the second branch isolation switch of the bus segment subunit 13 , and the downstream parallel second branch of the downstream parallel electronic supply unit 12 In series.

In the modular electric appliance for parallel power supply and the modular electric appliance used for AT, each circuit component is separately sealed and combined by using epoxy resin.

Figure 3 is an electrical schematic diagram of the AT power supply mode that allows the upper and lower power supply arms to be separated and simultaneously powered by the AT mode.

We can use the traction power supply system of the electrified railway AT power supply consisting of traction substation, parallel power supply unit, integrated AT, electric segmentation and traction network as shown in Figure 3, instead of Figure 1. The traction power supply system of the existing electrified railway AT power supply mode consisting of traction substation, AT sub-station, AT, and traction network, which is connected to the upper and lower power supply arms through the AT and ends through the AT partition. Replace the electrified railway connected by the traction substation, the parallel power supply unit, the integrated AT, and the traction network, and the parallel and power supply units and the integrated AT to realize the parallel power supply of the upper and lower power supply arms. AT power supply traction power supply system.

It can be seen from Fig. 3 that the upper and lower power supply arms supplied by the A traction substation are connected in parallel at the middle and the end of the power supply arm through the first parallel power supply unit 101 and the second parallel power supply unit 102; through the integrated AT 301, integrated AT 302 implements AT mode power supply.

When the uplink (or downlink) traction network powered by the traction substation fails, the circuit breakers in the first parallel power supply unit 101 and the second parallel power supply unit 102 are opened; the first integrated AT 301, the second integration The circuit breaker in the AT 302 is opened, and the self-twisting transformer is cut off; the feeder circuit breaker of the traction substation is opened, and the fault is removed. After the fault is removed, the feeder circuit breaker of the traction substation automatically recloses and restarts the power supply to the traction network. If the fault is a non-permanent fault, the reclosing is successful, and the circuit breakers in the first parallel power supply unit 101 and the second parallel power supply unit 102 respectively detect a closed switch to restore the parallel power supply. The circuit breakers in the first integrated AT 301 and the second integrated AT 302 are respectively detected with a press-closer, and each of the self-turning transformers is input to restore the AT power supply mode.

Similarly, the upper and lower traction nets powered by the B traction substation are connected in parallel at the middle and the end of the power supply arm through the fourth parallel power supply unit 104 and the third parallel power supply unit 103; through the third integrated AT 303, the fourth integrated type The self-turning transformer in AT 304 implements AT mode power supply.

(1) Meet the requirements that the upper and lower power supply arms can be separated and powered by AT mode at the same time.

Figure 4 is a schematic diagram of the modular electrical system of a parallel power supply unit that satisfies the power supply of the upper and lower sections and the power supply arm section power failure.

It can be seen from FIG. 4 that the parallel power supply unit is composed of the parallel electronic supply unit 11 and the parallel electronic supply unit 12 And a 2 X 27.5 kV bus segment sub-unit 13 between them.

It can also be seen from Fig. 3 and Fig. 4 that when the upper and lower traction nets need to be separated and simultaneously supplied by the AT mode, the 2 X 27.5 kV bus sectional isolation switch 3G in the first parallel power supply unit 101 is opened, and the second parallel connection The 2 X 27.5 kV bus segmentation unit isolating switch 3G in the power supply unit 102 is also opened, electrically separating the upper and lower contact nets. The self-deformation transformers AT1 and AT2 in the integrated AT 301 and the integrated AT 302 are mutually unlocked; the self-transformer ATI in the integrated AT 301 passes through the circuit breaker 1DL, 1DL in the first parallel power supply unit 101 and The uplink contact network is connected; the automatic transformer ATI in the integrated AT 302 is connected to the uplink contact network through the circuit breaker 1DL and the 1DL in the second parallel power supply unit 102, so that the uplink contact network is powered by the AT mode. Similarly, the self-transfer transformer AT2 in the integrated AT 301 is connected to the downlink contact network through the circuit breaker 2DL, 2DL in the first parallel power supply unit 101; the self-transformer transformer AT2 in the integrated AT 302 passes the circuit breaker 2DL, The 2DL in the parallel power supply unit 102 is connected to the downlink contact network, so that the downlink contact network is powered by the AT mode.

(2) When the contact network has a permanent fault, the power supply arm can be powered off in sections to reduce the power outage range of the contact network and meet the needs of driving electricity.

It can also be seen from FIG. 3 that the uplink contact network is provided with an electrical segment on the side of the traction substation and a catenary isolating switch 5G connected in parallel with the electrical segment at the connection between the first parallel power supply unit 101 and the upstream contact network; One side is provided with an electrical segment and a catenary isolating switch 6G in parallel with the electrical segment.

When a permanent fault occurs in the L1 section of the uplink contact network, the upstream feeder circuit breaker of the A traction substation is opened, and the contact network isolation switch 5G is opened, and the fault contact network is cut off. The contact network isolating switch 6G is closed; in the first parallel power supply unit 101, the switches in the upstream parallel electronic supply unit 11 and the downstream parallel electronic supply unit 12 and the isolating switch 3G in the 2 X27.5 kV bus segment sub-unit 13 are closed; In the second parallel power supply unit 102, the switches in the upstream parallel supply unit 11 and the downstream parallel supply unit 12 And the isolation switch 3G in the 2 X 27.5kV bus segment sub-unit 13 is closed; one of the first integrated AT 301 and the second integrated AT 302 is put into operation, and the A traction substation is down. The feeder circuit breaker supplies the uplink L3, L2 section and the downlink power supply arm in AT mode, and realizes parallel power supply in the middle and the end of the power supply arm to reduce the power failure range and meet the needs of driving power.

When a permanent fault occurs in the L2 section of the uplink contact network, the uplink feeder circuit breaker of the A traction substation is opened, and the contact network isolation switch 6G is opened; in the second parallel power supply unit 102, the switch of the parallel parallel supply electronic unit 11 And the isolation switch 3G in the 2 X 27.5 kV bus segment sub-unit 13 is opened to cut off the fault contact network; meanwhile, the self-deformation transformers AT1 and AT2 in the second integrated AT 302 are mutually unlocked. The contact network isolating switch 5G is closed; the upper and lower feeder circuit breakers are closed in the first traction power substation; in the first parallel power supply unit 101, the switches in the upstream parallel electronic supply unit 11 and the downstream parallel electronic supply unit 12 and 2 X 27.5 The isolation switch 3G in the kV bus section sub-unit 13 is closed, and one self-turning transformer in the first integrated AT 301 is put into operation; in the second parallel power supply unit 102, the switch in the downstream parallel supply electronic unit 12 is closed, The self-tantalizing transformer AT2 in the second integrated AT 302 is put into operation, and the upper and lower feeder circuit breakers of the A traction substation are supplied to the uplink L1, L3 sections and the downlink power supply arm according to the AT mode, and are realized in the middle of the power supply arm. Parallel power supply, reduce the power outage range, to meet the needs of driving electricity.

When a permanent fault occurs in the L3 section of the uplink contact network, the feeder circuit breaker of the A traction substation is opened, and the contact network isolation switches 5G and 6G are opened; in the first parallel power supply unit 101, the parallel parallel supply is provided in the electronic unit 11 The switch and the isolating switch 3G in the 2 X 27.5 kV bus segment sub-unit 13 are opened to cut off the fault contact net; meanwhile, the self-turning transformers AT1 and AT2 in the first integrated AT 301 release the mutual blocking condition. The traction feeder circuit breaker of A traction substation is closed, and the upstream L1 section is powered by direct power supply. In the first parallel power supply unit 101, the switch in the parallel parallel supply electronic unit 12 is closed, and the self-twisting voltage in the first integrated AT 301 is closed. The AT2 is put into operation; in the second parallel power supply unit 102, the switch in the upstream parallel supply unit 11 and the downstream parallel supply unit 12 and the isolation switch 3G in the 2 X27.5 kV bus section subunit 13 are closed, the second integration A self-tapping transformer of the AT-type 302 is put into operation, and the downstream feeder circuit breaker of the A-pull substation is supplied to the downlink power supply arm according to the AT mode, and at the same time, the parallel-connected electronic supply unit 12, 2 X27.5kV bus-line sub-unit 13 The isolating switch 3G and the upstream parallel electronic supply unit 11 supply power to the uplink L3 section in a direct power supply mode, thereby reducing the power outage range and meeting the needs of driving power.

Similarly, when a permanent fault occurs in the L4 (or L5 or L6) segment of the downlink contact network, the downlink catenary segment power outage requirement can also be realized, and the catenary power outage range can be reduced to meet the traffic demand. The B-pull substation can also meet the requirements of the catenary section power outage.

According to the wiring pattern of the parallel power supply unit consisting of the upstream parallel supply unit 11 and the downstream parallel supply unit 12 and the 2 X 27.5 kV bus section sub-unit 13 shown in the broken line frame of FIG. 4, a structure as shown in FIG. 5 can be designed. Type 2 X27.5kV outdoor modular appliances to meet the application needs of parallel power supply units. It can be seen from the figure that the transformers 1B and 2B replace the conventional voltage transformers on the F line, and take power from the F line of the upper and lower contact nets respectively, which not only meets the voltage demand requirements for protection but also meets the open circuit. The electrical requirements of the electric operating mechanism of the disconnector and the isolating switch; at the same time, the primary output terminal of the transformer is also used as the F-class static contact of the double-stage isolating switch 1G (or 2G). The voltage transformers 1YH and 2YH respectively take power from the T lines of the upper and lower contact nets to provide the voltage demand requirements for protection. At the same time, the primary outgoing terminal is also used as the T of the two-stage isolating switch 1G (or 2G). Stage static contacts. Both the 1G and 2G isolation switches use a switching method on the moving contacts.

The connection between the parallel power supply unit and the T-line and F-line of the upper and lower contact nets is all in the overhead line mode; and the integrated AT can be connected by overhead or cable as needed.

Figure 6 is a schematic diagram of the main wiring of the integrated AT that satisfies the separation of the upper and lower power supply arms while the AT mode is supplied and the power supply arm is powered off. The integrated AT shown in Figure 6 consists of the upstream AT module 31 and the self-transformer transformer ATI, the downstream AT module 32, and the self-transformer transformer AT2.

According to the integrated AT wiring pattern shown in Figure 6, a 2 X27.5kV outdoor modular appliance of the type shown in Figure 7 can be designed to meet the application needs of the integrated AT.

Figure 8 is a general layout diagram of the integrated AT that satisfies the separation of the upper and lower power supply arms while the AT mode is supplied and the power supply arm is powered off.

A new main-wire type, all-outdoor, versatile and standardized integrated AT system consisting of 2 X27.5kV outdoor modular appliances and self-tapping transformers. It has a small footprint and a high degree of factory manufacturing. There is no need to produce houses, meet unattended and unattended requirements, reduce on-site construction work, and shorten the construction cycle.

It can also be seen from Fig. 3 that only four back 27.5kV cables can be connected between the parallel power supply unit and the integrated AT, so that the upper and lower power supply arms can be separated and powered by the AT mode at the same time. The AT power supply function required for the power failure of the segment.

The traction power supply system of the present embodiment is composed of a traction substation, a parallel power supply unit, an integrated AT, an electric segment, a traction network, and a crossover power supply unit, and is in the middle of the power supply arm of the upper and lower traction nets. Instead of the traction power supply system of the electrified railway AT power supply mode that realizes the parallel power supply through the parallel power supply unit and the AT power supply function realized by the integrated AT, instead of the traction substation, the substation, the AT, and the traction network, the power supply The traction power supply system of the existing electrified railway AT power supply mode in which the end of the arm passes through the AT and the end is connected by the partition; instead of the traction substation, the parallel power supply unit, the crossover power supply unit, the integrated AT, and the traction network In the middle and end of the power supply arm, the parallel power supply is realized by the parallel power supply unit, and the traction power supply system of the electrified railway AT power supply mode of the AT power supply function realized by the integrated AT is feasible. Studying a new type of structure 2 X27.5kV outdoor modular electrical appliances to meet the requirements of the upper and lower power supply arms can be separated and AT power supply, The power supply arm can meet the needs of the new AT power supply mode with power failure, and can realize the parallel power supply function between the middle and the end of the power supply arm; no special site is required, and the installation location can be flexibly selected beside the railway main line; High reliability and maintenance-free Miniaturized and standardized products are required; research on a new structure that is compatible with parallel power supply units, occupying a small area of land, high degree of factory manufacturing, standardization, and no need to produce houses and save land resources. It is also necessary that the type of AT module meets the needs of the integrated AT. It can also save land resources, save investment in production houses and power supply lines, reduce on-site construction work, and shorten construction period.

Claims

1. A traction power supply system capable of realizing upper and lower power supply arms to be separately powered by AT, comprising a traction substation disposed on the side of the electrified railway, and an output side of the traction substation is connected to the upper/downward traction network The upper/downward traction nets respectively include a contact suspension T line and a positive feed line F line, and parallel devices with parallel power supply functions are provided in the middle and end of the power supply arm of the upper/downward traction network, and the power supply arm of the upper/downward traction network An electrical segment having an electrical segmentation function for electrically disconnecting the catenary and an isolating switch in parallel with the electrical segment are provided in the middle, and electrical separation between the power supply arms of the upper/downward traction nets of two adjacent traction substations The cross-connected device is connected to the AT device, wherein the parallel device includes a first parallel power supply unit, a second parallel power supply unit, a third parallel power supply unit, and a fourth parallel power supply. The unit includes a first handover power supply unit and a second handover power supply unit; the AT device includes a first integrated AT, a second integrated AT, and a The integrated AT, the fourth integrated AT, the first parallel power supply unit is connected to the first integrated AT, the second parallel power supply unit is connected to the second integrated AT, the third a parallel power supply unit is connected to the third integrated AT, the fourth parallel power supply unit is connected to the fourth integrated AT; the first parallel power supply unit, the second parallel power supply unit, and the third parallel power supply unit The fourth parallel power supply unit is a modular electric appliance for parallel power supply, and the parallel electric power supply modular electric appliance includes an uplink first input end, an uplink second input end, a downlink first input end, and a downlink second input end, where the uplink An input terminal and an uplink second input terminal are respectively connected to the T line and the F line of the uplink traction network, and the downlink first input end and the downlink second input end are connected to the T line and the F line of the downlink traction network. The utility model is characterized in that: the modular electric appliance for parallel power supply comprises a bracket, an upstream parallel electronic supply unit mounted on the bracket, a downlink parallel electronic supply unit, a busbar segmentation subunit, and parallel power supply. Control box and parallel power supply The uplink parallel parallel electronic supply unit includes an uplink parallel first branch and an uplink parallel second branch, and the downlink parallel electronic supply unit includes a downlink parallel first branch and a downlink parallel second branch, the bus branch The segment subunit includes a first branch isolation switch and a second branch isolation switch; the upstream parallel first branch and the downstream parallel first branch are connected in series, and the uplink parallel second branch and the downstream parallel second branch are connected in series The first branch isolation switch is disposed between the upstream parallel first branch and the downlink parallel first branch, and the second is disposed between the uplink parallel second branch and the downlink parallel second branch a branch isolation switch; the two ends of the first branch isolation switch are respectively connected with an uplink T input end and a downlink T input end of the integrated AT corresponding to the parallel power supply unit, and the second branch isolation switch is connected The two ends are respectively connected with an uplink F input end and a downlink F input end of the integrated AT corresponding to the parallel power supply unit; the integrated AT includes an uplink AT transformer, a downlink AT transformer, and an uplink AT The modular electrical appliance used in the modular AT and the downstream AT includes the uplink T input terminal and the uplink F input terminal, and the modular electrical appliance used in the downlink AT includes a downlink T input terminal and a downlink F input terminal. The modular electrical appliance used for the uplink AT is connected to the uplink AT transformer, the modular electrical appliance used by the downstream AT is connected to the downstream AT transformer, and the grounding end of the upstream AT transformer and the downstream AT transformer is connected to the return line and the grounding network, the uplink A firewall is installed between the AT transformer and the downstream AT transformer; the modular electrical appliances used in the uplink AT and the modular electrical appliances used in the downstream AT use modular electrical appliances used by the AT, and the modular electrical appliances used in the AT include a bracket and a T mounted on the bracket. The first branch of the line and the first branch of the F line; The first branch of the T line includes a first circuit breaker of a squall line, a first current transformer of a squall line, a first isolation switch of a squall line, a first voltage transformer and a fuse of a τ line, and the first circuit breaker of the squall line a first current transformer of the 线 line, a first isolation switch of the τ line connected in series, the first voltage transformer of the squall line and the fuse are connected in series, and an input end of the first fuse of the squall line is connected to the input end of the τ line, The output end of the first circuit breaker of the 线 line is connected to the T line input end of the first AT transformer; the first branch of the F line includes the first circuit breaker of the F line, the first current transformer of the F line, and the first isolation of the F line a first micro-transformer and a fuse of the F-line, the F-line first circuit breaker, the F-line first current transformer, and the F-line first isolation switch are connected in series, and the F-line first micro-transformer and the fuse are connected in series, An input end of the F-wire first fuse is connected to the F line input end, and an output end of the F line first circuit breaker is connected to the first AT transformer F line input end; the T line first current transformer, T line first voltage transformer, F line first current transformer, F line Micro-transformers are connected with the integrated AT prefabricated outdoor protection and control cabinet.

2. The traction power supply system capable of realizing upper and lower power supply arms separately and capable of being powered by AT according to claim 1, characterized in that: in the middle of the power supply arm of the upper/downward traction network, the contact net is electrically connected An electrical segment of the segmentation function and an isolating switch in parallel with the electrical segment.

3. The traction power supply system capable of separately supplying power to the upper and lower power supply arms according to claim 2, wherein: the electrical segment is respectively disposed on both sides of the contact net at the connection with the parallel device; An isolating switch in parallel with the electrical segment.

The traction power supply system capable of realizing the power supply of the upper and lower power supply arms separately according to the AT mode according to any one of claims 1 to 3, wherein: the uplink parallel parallel first branch includes parallel power supply uplink first isolation switch Parallel power supply uplink first current transformer, parallel power supply uplink first circuit breaker and The first power transformer and the fuse are connected, the parallel power supply uplink first isolation switch, the parallel power supply uplink first current transformer, and the parallel power supply uplink first circuit breaker are connected in series, and the parallel power supply uplink first voltage transformer In parallel with the fuse, the input end of the upstream first fuse is connected to the upstream first input end of the parallel power supply modular electrical appliance; the downstream parallel first branch includes the parallel power supply downstream first isolation switch, and the parallel power supply downlink a current transformer, a parallel power supply downlink first circuit breaker and a parallel power supply downlink first voltage transformer and a fuse, the parallel power supply downlink first isolation switch, parallel power supply downlink first current transformer, parallel power supply downlink first circuit breaker The parallel connection of the first voltage transformer and the fuse is connected in series, and the input end of the downlink first fuse is connected to the downlink first input end of the parallel power supply modular electrical appliance; the uplink parallel parallel second branch Including parallel power supply uplink second isolation switch, parallel power supply uplink second current transformer, parallel power supply The second circuit breaker and the parallel power supply uplink second micro-transformer and the fuse, the parallel power supply uplink second isolation switch, the parallel power supply uplink second current transformer, the parallel power supply uplink second circuit breaker are connected in series, and the parallel power supply uplink a second micro-transformer and a fuse are connected in series, an input end of the uplink second fuse is connected to an uplink second input end of the parallel power supply modular appliance; and the downlink parallel second branch includes a parallel power supply downlink second isolation switch, Parallel power supply downlink second current transformer, parallel power supply downlink second circuit breaker and parallel power supply downlink second micro transformer and fuse, said parallel power supply downlink second isolation switch, parallel power supply downlink second current transformer, parallel power supply downlink The second circuit breaker is connected in series, the parallel power supply downlink second micro-transformer and the fuse are connected in series, and the input end of the downlink second fuse is connected to the downlink second input end of the parallel power supply modular electrical appliance; A current transformer and parallel power supply uplink first voltage transformer, parallel power supply down The first current transformer and the parallel power supply downlink first voltage transformer, the parallel power supply uplink second The secondary output terminals of the current transformer and the parallel current supply and the second current transformer are connected to the parallel power supply control box, and the secondary output terminals of the parallel power supply uplink second micro transformer and the parallel power supply downlink second micro transformer are connected. Parallel power supply box; The voltage detection signal of the parallel parallel second branch and the downstream parallel second branch of the parallel power supply control box is drawn from the parallel power supply box.