Urban rail train high voltage bus circuit

Abstract

The present invention provides a high-voltage busbar circuit for an urban rail train, comprising a busbar, a plurality of three-position switches, a plurality of traction auxiliary contactors and a plurality of traction auxiliary fuses; the busbar is connected to the traction motor of each carriage through each of the three-position switches; the busbars of two adjacent carriages are connected through a traction auxiliary contactor and a traction auxiliary fuse. By configuring the three-position switch, it is ensured that each traction auxiliary device can be grounded, making the high-voltage busbar circuit of the train safer and more reliable. In addition, a traction auxiliary contactor is configured between two adjacent carriages to ensure that the non-powered area will not be connected to the powered area, and the traction auxiliary fuse between the two adjacent carriages can effectively protect the line between the two adjacent carriages, thereby making the power supply system work more reliable and safe.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage busbars for urban rail trains, and in particular to a high-voltage busbar circuit for urban rail trains. Background Art

[0002] There are various solutions for the power supply of three rails at present, but these solutions only connect the power supply between train units, cannot fully guarantee the power supply problem in the power-free area, and do not ground the equipment of the traction auxiliary system. Summary of the invention

[0003] Based on this, it is necessary to provide a high-voltage bus circuit for urban rail trains to address the above technical issues.

[0004] A high-voltage bus circuit for an urban rail train comprises: a bus, at least one three-position switch, a plurality of traction auxiliary contactors, and a plurality of traction auxiliary fuses;

[0005] The busbar is connected to the traction motor of each carriage through each of the three-position switches;

[0006] The busbars of two adjacent carriages are connected via a traction auxiliary contactor and a traction auxiliary fuse.

[0007] In one of the embodiments, a battery is further included, the busbar is connected to the battery, and the battery is connected to the traction motor of each carriage.

[0008] In one of the embodiments, an auxiliary converter is further included, and the busbar is connected to the auxiliary converter.

[0009] In one of the embodiments, an auxiliary bus diode is further included, and the bus is connected to the auxiliary converter via the auxiliary bus diode.

[0010] In one of the embodiments, an auxiliary bus fuse is further included, and the bus is connected to the auxiliary converter via the auxiliary bus fuse.

[0011] In one of the embodiments, an auxiliary fuse is further included, and the bus is connected to the auxiliary converter through the auxiliary bus fuse and the auxiliary fuse.

[0012] In one of the embodiments, it further includes a traction inverter and a variable frequency speed regulator, and the bus is connected to the traction motor of a carriage through the traction inverter and the variable frequency speed regulator.

[0013] In one of the embodiments, a traction high-speed circuit breaker is further included, and the busbar is connected to the traction converter via the traction high-speed circuit breaker.

[0014] In one embodiment, the three-position switch has five poles.

[0015] In one embodiment, the three-position switch includes two groups of three-position switches, and each group of the three-position switches has five poles.

[0016] The above-mentioned urban rail train high-voltage bus circuit is equipped with a three-position switch to ensure that all traction auxiliary equipment can be grounded, making the train high-voltage bus circuit safer and more reliable. In addition, a traction auxiliary contactor is arranged between two adjacent carriages to ensure that the non-powered area will not be connected to the powered area, and a traction auxiliary fuse is arranged between the two adjacent carriages to effectively protect the line between the two adjacent carriages, thereby making the power supply system more reliable and safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is a circuit schematic diagram of a high-voltage bus circuit of an urban rail train in one embodiment. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0019] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0020] Embodiment 1

[0021] In this embodiment, Figure 1 As shown, a high-voltage bus circuit of an urban rail train is provided, comprising: a bus, two three-position switches, a plurality of traction auxiliary contactors and a plurality of traction auxiliary fuses; the bus is connected to the traction motor of each carriage through each of the three-position switches; the busbars of two adjacent carriages are connected through one of the traction auxiliary contactors and one of the traction auxiliary fuses.

[0022] In this embodiment, the high-voltage busbar is connected to each carriage to ensure the normal power supply of traction auxiliary in any three-track power-free area. The three-position switch is also called a three-station switch. One of the three free ends of the three-position switch is used for grounding, one is used for connecting the workshop power supply, and one is connected to the current collector. The traction auxiliary fuse can protect against short circuits between two adjacent carriages, and the traction auxiliary contactor is used to disconnect the power supply connection between two adjacent carriages.

[0023] In this embodiment, by configuring a three-position switch, it is ensured that each traction auxiliary device can be grounded, making the train high-voltage bus circuit safer and more reliable. In addition, a traction auxiliary contactor is configured between two adjacent carriages to ensure that the non-powered area will not be connected to the powered area, and a traction auxiliary fuse is configured between two adjacent carriages, which can effectively protect the line between the two adjacent carriages, thereby making the power supply system work more reliable and safe.

[0024] In one of the embodiments, the high-voltage bus circuit of the urban rail train further includes a battery, the bus is connected to the battery, and the battery is connected to the traction motor of each carriage.

[0025] In this embodiment, the battery is used to store electrical energy so that the traction motor can be powered under emergency conditions, allowing the traction motor to operate normally.

[0026] In one of the embodiments, the urban rail train high-voltage bus circuit further includes an auxiliary converter, and the bus is connected to the auxiliary converter.

[0027] In this embodiment, the auxiliary converter is used to connect the air conditioner, compressor, electric heating equipment, lighting equipment, etc. in the carriage. Specifically, the auxiliary converter inverts the DC voltage (DC1500V) into a three-phase AC voltage (3AC380V / AC220V), provides a stable three-phase four-wire AC voltage for the air conditioner, air compressor, electric heating, AC lighting, etc., and converts the AC voltage (3AC380V / AC220V) into a DC110V voltage used by DC loads such as batteries, 110V lighting, and control power supplies for various components of the train through a DC110V charger.

[0028] In one of the embodiments, the high-voltage bus circuit of the urban rail train further includes an auxiliary bus diode, and the bus is connected to the auxiliary converter via the auxiliary bus diode.

[0029] In this embodiment, the auxiliary bus diode is unidirectionally conducted, which can effectively prevent the current of the auxiliary bus from flowing back to the traction converter.

[0030] In one of the embodiments, the high-voltage bus circuit of the urban rail train further includes an auxiliary bus fuse, and the bus is connected to the auxiliary converter via the auxiliary bus fuse.

[0031] In this embodiment, the auxiliary bus fuse is used for grounding or short-circuit protection of the train high-voltage auxiliary converter across the train line.

[0032] In one of the embodiments, the high-voltage bus circuit of the urban rail train further includes an auxiliary fuse, and the bus is connected to the auxiliary converter via the auxiliary bus fuse and the auxiliary fuse.

[0033] In this embodiment, it is used for grounding or short-circuit protection of the train auxiliary power supply circuit across the train.

[0034] In one of the embodiments, the high-voltage bus circuit of the urban rail train also includes a traction inverter and a variable frequency speed regulator (VVVF), and the bus is connected to the traction motor of a carriage through a traction inverter and a variable frequency speed regulator.

[0035] The traction converter inputs a DC1500V high-voltage power supply through a high-voltage circuit, and drives the traction motor after the charge-discharge unit and VVVF conversion. Under braking conditions, the VVVF traction converter consumes the braking energy fed back by the traction motor on the braking resistor through the chopper unit. At the same time, the DC1500V negative line of the traction converter is connected to the grounding device to form a complete main circuit loop of the train.

[0036] In one of the embodiments, the high-voltage bus circuit of the urban rail train further includes a traction high-speed circuit breaker, and the bus is connected to the traction converter via the traction high-speed circuit breaker.

[0037] In this embodiment, the traction high-speed circuit breaker is used for fault protection of the main circuit. When a serious fault occurs in the main circuit, such as grid voltage or DC voltage overvoltage, DC side current overcurrent, or main circuit grounding, timely protection is provided. At the same time, the high-speed circuit breaker can quickly respond to the detected overcurrent and trip, and the high-speed circuit breaker is immediately disconnected to achieve short-circuit protection of the main circuit. The high-speed circuit breaker is an electrically maintained, electrically controlled, and directly transient overcurrent release type, with high reliability and high-voltage electrical performance.

[0038] It should be understood that the number of poles of the three-position switch can be one or more, and the three-position switch is connected to protect the traction auxiliary equipment, such as the traction motor. The number of poles of the three-position switch is related to the number of loads, and the number of poles of the three-position switch can be set according to the number of loads.

[0039] In this embodiment, two groups of three-position switches are provided, and each group of three-position switches has five poles.

[0040] The above-mentioned urban rail train high-voltage bus circuit is equipped with a three-position switch to ensure that all traction auxiliary equipment can be grounded, making the train high-voltage bus circuit safer and more reliable. In addition, a traction auxiliary contactor is arranged between two adjacent carriages to ensure that the non-powered area will not be connected to the powered area, and a traction auxiliary fuse is arranged between the two adjacent carriages to effectively protect the line between the two adjacent carriages, thereby making the power supply system more reliable and safe.

[0041] Embodiment 2

[0042] In this embodiment, please combine Figure 1 , each unit in the circuit is further described. Among them, if there are multiple identical units or components, one or two of them are selected for description, and the remaining identical components are not described in detail.

[0043] 1) High voltage electrical box A

[0044] Traction auxiliary fuse FU1 (between two adjacent carriages): protection against line short circuit between two carriages.

[0045] Traction auxiliary contactor BLB1 (between two adjacent carriages): disconnects the power supply connection between two adjacent carriages.

[0046] Three-position five-level isolating switch: It receives current from the power supply rail, workshop power supply and grounds various traction auxiliary equipment. It is used for switching and isolating the input main circuit operation, warehouse power supply and grounding position.

[0047] Auxiliary bus diode D1: prevents the auxiliary bus current from flowing back to the traction converter.

[0048] Auxiliary bus fuse FU2 and auxiliary fuse FU3: protect the auxiliary bus and auxiliary converter.

[0049] Traction high-speed circuit breaker HB3: used for fault protection of the main circuit. It provides timely protection when serious faults occur in the main circuit, such as grid voltage or DC voltage overvoltage, DC side current overcurrent, or main circuit grounding.

[0050] It consists of busbar fuses, auxiliary converter fuses, main isolating switches, high-speed circuit breakers, warehouse sockets, diodes, etc.

[0051] The auxiliary bus fuse is used for grounding or short-circuit protection of the train's high-voltage auxiliary converter cross-car line, and the auxiliary converter fuse is used for grounding or short-circuit protection of the train's auxiliary power supply circuit cross-car. At the same time, the high-speed circuit breaker can quickly respond to the detected overcurrent and trip, and the high-speed circuit breaker will immediately disconnect to achieve short-circuit protection of the main circuit. The high-speed circuit breaker is an electrically maintained, electrically controlled and directly transient overcurrent release type with high reliability and high-voltage electrical performance.

[0052] Battery traction auxiliary contactor KMB1: Under battery traction conditions, it realizes the switching of the battery traction circuit.

[0053] 2) High voltage electrical box B

[0054] Traction auxiliary contactor BLB2 (between two adjacent carriages): disconnects the power supply connection between two adjacent carriages.

[0055] Traction auxiliary fuse FU2 (between two adjacent carriages): protection against line short circuit between two carriages.

[0056] Traction high-speed circuit breaker HB1: used for fault protection of the main circuit. It provides timely protection when serious faults occur in the main circuit, such as grid voltage or DC voltage overvoltage, DC side current overcurrent, or main circuit grounding.

[0057] 3) Busbar high voltage electrical box

[0058] Traction auxiliary contactor BLB2 (between two adjacent carriages): disconnects the power supply connection between two adjacent carriages.

[0059] Traction auxiliary fuse FU2 (between two adjacent carriages): protection against line short circuit between two carriages.

[0060] Traction converter:

[0061] The traction converter inputs a DC1500V high-voltage power supply through a high-voltage circuit, and drives the traction motor after the charge-discharge unit and VVVF conversion. Under braking conditions, the VVVF traction converter consumes the braking energy fed back by the traction motor on the braking resistor through the chopper unit. At the same time, the DC1500V negative line of the traction converter is connected to the grounding device to form a complete main circuit loop of the train.

[0062] Auxiliary converter: The auxiliary converter converts the DC voltage (DC1500V) into a three-phase AC voltage (3AC380V / AC220V), providing a stable three-phase four-wire AC voltage for air conditioners, air compressors, electric heating, AC lighting, etc., and converts the AC voltage (3AC380V / AC220V) into a DC110V voltage for DC loads such as batteries, 110V lighting, and control power supplies for various train components through a DC110V charger.

[0063] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A high-voltage bus circuit for an urban rail train, characterized in that: include: a busbar, at least one three-position switch, a plurality of traction auxiliary contactors, a plurality of traction auxiliary fuses and an auxiliary converter; The busbar is connected to the traction motor of the carriage through the three-position switch, and one end of the three-position switch is used for grounding; The busbars of two adjacent carriages are connected via a traction auxiliary contactor and a traction auxiliary fuse; It also includes an auxiliary bus fuse and an auxiliary fuse, and the auxiliary converter of each carriage is connected to the bus through the auxiliary bus fuse and the auxiliary fuse.

2. The high-voltage busbar circuit of an urban rail train according to claim 1, characterized in that: It also includes a battery, the busbar is connected to the battery, and the battery is connected to the traction motor of each carriage.

3. The high-voltage busbar circuit of an urban rail train according to claim 1, characterized in that: It also includes an auxiliary bus diode, and the bus is connected to the auxiliary converter through the auxiliary bus diode.

4. The high-voltage busbar circuit of an urban rail train according to claim 1, characterized in that: It also includes a traction inverter and a variable frequency speed regulator. The bus is connected to the traction motor of a carriage through the traction inverter and the variable frequency speed regulator.

5. The high-voltage busbar circuit of an urban rail train according to claim 4, characterized in that: It also includes a traction high-speed circuit breaker, and the busbar is connected to the traction converter via the traction high-speed circuit breaker.

6. The high-voltage busbar circuit of an urban rail train according to any one of claims 1 to 5, characterized in that: The three-position switch has five poles.

7. The high-voltage busbar circuit of an urban rail train according to claim 6, characterized in that: The three-position switch includes two three-position switches, and each of the three-position switches has five poles.

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