Double-current system vehicle grounding circuit

Abstract

The utility model relates to the field of rail transit, and discloses a double-current system vehicle grounding circuit which comprises a plurality of vehicle bodies and grounding busbars, the plurality of vehicle bodies are connected through grounding wires, each vehicle body is connected with a bogie in the vehicle body through a grounding wire, the vehicle body is further connected to a first grounding busbar through a grounding wire, and the grounding busbars are connected with a second grounding busbar through a grounding wire. The grounding resistor is connected between the first grounding busbar and the vehicle body, the first grounding busbar is communicated with the wheels through the electric wires, and the safety of the vehicle and vehicle equipment can be improved when the grounding circuit is applied to the double-current system vehicle.

Description

Technical Field

[0001] The utility model relates to the field of rail transportation, in particular to a grounding circuit of a dual-current vehicle. Background Art

[0002] With the rapid development of urbanization, more and more cities are seeing a surge in the number of people living in the suburbs and commuting to work in the city. This demographic is experiencing a surge in demand for transportation: fast, direct access. Consequently, suburban railway lines have emerged. Suburban railway lines are typically long, with large station spacing and few controlled factors. They primarily utilize a 27.5kV / 50Hz AC traction power supply system, which offers low investment, low maintenance costs, and high operating speeds (typically 120-160 km / h), enabling rapid travel. The application of AC / DC dual-current power supply in rail transit effectively bridges the gap between suburban and urban rail transit, and holds great promise for future applications.

[0003] One of the key technologies of AC / DC dual-current traction power supply is the grounding of vehicles and vehicle equipment. Since AC and DC power supplies use different electronic devices, two grounding systems are required to ensure driving safety. However, how to better connect the layout of the two grounding systems is the core issue of dual-current power supply. Utility Model Content

[0004] The utility model aims to provide a dual-current vehicle grounding circuit to solve the problem of which grounding circuit to use to ensure driving safety due to the different electronic devices used for AC power supply and DC power supply.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical solution: a dual-current vehicle grounding circuit, including multiple car bodies and a grounding bus, the multiple car bodies are connected by grounding wires, each car body is connected to the bogie in the car body by a grounding wire, the car body is also connected to the first grounding bus through the grounding wire, a grounding resistor is connected between the first grounding bus and the car body, and the first grounding bus is connected to the wheel through the grounding wire.

[0006] The principles and advantages of this solution are as follows: the car body and bogie are connected by a ground wire, and the car body is connected to the wheels via a bus. When there is a leakage or lightning strike, the electricity on the car body and bogie can be smoothly introduced to the wheels. Since the wheels are in contact with the rails, and the rails are installed on the ground, the current on the car body and bogie can be directed to the ground, thus protecting the passengers and equipment in the car body. In addition, multiple car bodies are also connected by ground wires. When any car body has a leakage, it can be guided to the ground with the help of other car bodies. A grounding resistor is connected between the first grounding bus and the car body. The grounding resistor can consume the induced current or static electricity in the car body, and also plays a good protective role.

[0007] Furthermore, each car body is individually connected to a grounding wire that is connected to the overhead grounding wire of the contact network; in this way, when a leakage occurs in the car body, the current can also flow away from the grounding wire in the contact network.

[0008] Furthermore, adjacent vehicle bodies are connected by two grounding wires with a cross-sectional area of ​​120 square millimeters.

[0009] Furthermore, the car body and the bogies on both sides of the car body are connected by grounding wires with a cross-sectional area of ​​120 square millimeters.

[0010] Furthermore, the vehicle body and the first grounding bus are connected by a grounding wire with a cross-sectional area of ​​120 square millimeters.

[0011] The beneficial effects are: adjacent car bodies, the car body and the bogies on both sides, and the car body and the first grounding bus are all connected by grounding wires with a cross-sectional area of ​​120 square millimeters, ensuring that large currents such as lightning strikes can pass through, thereby protecting the vehicle. Not using thicker grounding wires is to ensure the vehicle is as lightweight as possible.

[0012] As an improvement, the first grounding bus includes a left grounding bus and a right grounding bus, and the left grounding bus and the right grounding bus are respectively connected to the vehicle body by grounding wires. The left grounding bus is connected to the left wheel by a grounding wire with a cross-sectional area of ​​120 square millimeters, and the right grounding bus is connected to the right wheel by a grounding wire with a cross-sectional area of ​​120 square millimeters.

[0013] The beneficial effect of this improvement is that the first grounding bus is divided into two sections, which can take into account the positions of the wheels on both sides and avoid interference in installation.

[0014] Wherein, if the vehicle body includes a traction inverter, the grounding end of the traction inverter is connected to the second grounding bus using a grounding wire with a cross-sectional area of ​​95 square millimeters, and the second grounding bus is connected to the first grounding bus using a grounding wire with a cross-sectional area of ​​95 square millimeters.

[0015] In addition, if the vehicle body includes a traction transformer, the traction transformer is connected to a fourth grounding bus, and the fourth grounding bus is also connected to the wheels. The traction transformer and the fourth grounding bus are connected by a grounding wire with a cross-sectional area of ​​50 square millimeters, and the fourth grounding bus and the wheels are connected by a grounding wire with a cross-sectional area of ​​50 square millimeters.

[0016] Finally, if the vehicle body includes both a traction transformer and a traction converter, the grounding end of the traction converter is connected to the second grounding bus, the second grounding bus is connected to the first grounding bus through a grounding wire, the first grounding bus is connected to the wheel, the traction transformer is connected to the fourth grounding bus, the fourth grounding bus is also connected to the wheel, the traction converter and the second grounding bus are connected via a grounding wire with a cross-sectional area of ​​120 square millimeters, the first grounding bus and the traction transformer, the first grounding bus and the fourth grounding bus are connected via a grounding wire with a cross-sectional area of ​​50 square millimeters, and the fourth grounding bus and the wheel are connected via a grounding wire with a cross-sectional area of ​​50 square millimeters.

[0017] The beneficial effects of these features are as follows: since the vehicle uses both DC and AC power, the necessary equipment for DC power supply is the traction converter, and the necessary equipment for AC power supply is the traction transformer. The power supply equipment for the cab-carriage (Mc) is the traction inverter, and the power supply equipment for the pantograph-carriage (Mp) is the traction converter. The power supply equipment for the power carriage (M) includes both the traction converter and the traction transformer. The power supply equipment primarily addresses short circuits or leakage in the power circuit. Each power supply device uses a separate busbar, which can be connected to other electrical devices in the same location. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the grounding circuit structure between vehicle bodies.

[0019] Figure 2 This is a schematic diagram of the cab body (Mc) grounding circuit structure.

[0020] Figure 3 Schematic diagram of the grounding circuit structure of the car body with pantograph (Mp).

[0021] Figure 4 Schematic diagram of the grounding circuit structure of the power vehicle body (M). DETAILED DESCRIPTION

[0022] The following is further explained in detail through specific implementation methods. The figure numerals in the drawings of the specification include: bogie 1, traction inverter 2, second grounding bus 3, first grounding bus 4, wheel 5, traction converter 6, traction transformer 7, fourth grounding bus 8; grounding resistance R01, 150 square millimeter grounding wire PE1, 120 square millimeter grounding wire PE2, 95 square millimeter grounding wire PE3, 50 square millimeter grounding wire PE4.

[0023] The embodiment is basically as shown in the attached Figure 1 Figure 2 shows a dual-current vehicle grounding circuit. The vehicle consists of a cab car body Mc, a pantograph car body Mp, and a power car body M. Adjacent car bodies are connected by grounding wires. Each car body is connected to the overhead catenary grounding wire via a 150 mm² grounding wire PE1. Adjacent car bodies are connected using two 120 mm² grounding wires PE2.

[0024] like Figure 1 and Figure 2 As shown, the cab body Mc grounding circuit includes only the traction inverter 2 in the body. The grounding end of the traction inverter 2 is connected to the second grounding bus 3 using a grounding wire PE3 with a cross-sectional area of ​​95 square millimeters. The second grounding bus 3 is connected to the first grounding bus 4 using a grounding wire PE3 with a cross-sectional area of ​​95 square millimeters.

[0025] The car body is connected to the bogies 1 on both sides of the car body using a grounding wire PE2 with a cross-sectional area of ​​120 square millimeters. The car body is also connected to the first grounding bus 4 using a grounding wire PE2 with a cross-sectional area of ​​120 square millimeters, and a grounding resistor R01 is connected to the grounding wire. The first grounding bus 4 includes a left grounding bus and a right grounding bus. The left and right grounding buses are each connected to the car body using a grounding wire PE2 with a cross-sectional area of ​​120 square millimeters. The left grounding bus is connected to the left wheel 5 using a grounding wire PE2 with a cross-sectional area of ​​120 square millimeters, and the right grounding bus is connected to the right wheel 5 using a grounding wire PE2 with a cross-sectional area of ​​120 square millimeters.

[0026] like Figure 3 As shown, it is a grounding circuit of a car body Mp with a pantograph. The car body only includes a traction converter 6. The grounding end of the traction converter 6 is connected to the second grounding bus 3 using a grounding wire PE2 with a cross-sectional area of ​​120 square millimeters. The second grounding bus 3 is connected to the first grounding bus 4 using a grounding wire PE1 with a cross-sectional area of ​​150 square millimeters.

[0027] The car body is connected to both bogies within it using a grounding wire PE2 with a cross-sectional area of ​​120 square millimeters. The car body is also connected to the first grounding bus 4 using a grounding wire PE2 with a cross-sectional area of ​​120 square millimeters, with a grounding resistor R01 connected to the grounding wire. The first grounding bus 4 includes a left grounding bus and a right grounding bus. Each of the left and right grounding buses is connected to the car body using a grounding wire PE2 with a cross-sectional area of ​​120 square millimeters. The left grounding bus is connected to the left wheel 5 using a grounding wire PE2 with a cross-sectional area of ​​120 square millimeters, while the right grounding bus is connected to the right wheel 5 using a grounding wire PE2 with a cross-sectional area of ​​120 square millimeters.

[0028] like Figure 4 As shown, this is the grounding circuit of the power vehicle body M. When the vehicle body includes both a traction transformer 7 and a traction converter 6, the grounding end of the traction converter 6 is connected to the second grounding bus 3, and the second grounding bus is connected to the first grounding bus through a grounding wire. The first grounding bus 4 is connected to the wheels, and the traction transformer 7 is connected to the fourth grounding bus 8, which is also connected to the wheels.

[0029] The car body is connected to both bogies within it using a 120 square millimeter grounding wire PE2. The car body is also connected to the first grounding bus 4 using a 120 square millimeter grounding wire PE2, which is connected to a grounding resistor R01. The first grounding bus 4 includes a left grounding bus and a right grounding bus. Each of the left and right grounding buses is connected to the car body using a 120 square millimeter grounding wire PE2. The left grounding bus is connected to the left wheel 5 using a 120 square millimeter grounding wire PE2, while the right grounding bus is connected to the right wheel 5 using a 120 square millimeter grounding wire PE2.

[0030] The traction converter 6 is connected to the second grounding bus 3 via a grounding wire PE2 with a cross-sectional area of ​​120 square millimeters. The first grounding bus and the traction transformer 7 are connected to the fourth grounding bus 8 via a grounding wire PE4 with a cross-sectional area of ​​50 square millimeters. The fourth grounding bus 8 is connected to the wheel via a grounding wire PE4 with a cross-sectional area of ​​50 square millimeters.

[0031] The above description is merely an embodiment of the present invention, and the commonly known specific technical solutions and / or features of the solution are not described in detail here. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be considered as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed in this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. Dual-current vehicle grounding circuit, characterized by: It includes multiple car bodies and grounding buses, the multiple car bodies are connected by grounding wires, each car body is connected to the bogie in the car body by a grounding wire, the car body is also connected to a first grounding bus through a grounding wire, a grounding resistor is connected between the first grounding bus and the car body, and the first grounding bus is connected to the wheel through a grounding wire.

2. The dual-current vehicle grounding circuit according to claim 1, characterized in that: Each car body is individually connected to a grounding wire which is in communication with the overhead grounding wire of the contact network.

3. The dual-current vehicle grounding circuit according to claim 1, characterized in that: Adjacent car bodies are connected by two grounding wires with a cross-sectional area of ​​120 square millimeters.

4. The dual-current vehicle grounding circuit according to claim 1, characterized in that: The car body and the bogies on both sides of the car body are connected by grounding wires with a cross-sectional area of ​​120 square millimeters respectively.

5. The dual-current vehicle grounding circuit according to claim 1, characterized in that: The vehicle body and the first grounding bus are connected by a grounding wire with a cross-sectional area of ​​120 square millimeters.

6. The dual-current vehicle grounding circuit according to claim 5, characterized in that: The first grounding bus includes a left grounding bus and a right grounding bus. The left grounding bus and the right grounding bus are respectively connected to the vehicle body using grounding wires. The left grounding bus is connected to the left wheel using a grounding wire with a cross-sectional area of ​​120 square millimeters, and the right grounding bus is connected to the right wheel using a grounding wire with a cross-sectional area of ​​120 square millimeters.

7. The dual-current vehicle grounding circuit according to claim 6, characterized in that: The vehicle body includes a traction inverter, the grounding end of the traction inverter is connected to the second grounding busbar using a grounding wire with a cross-sectional area of ​​95 square millimeters, and the second grounding busbar is connected to the first grounding busbar using a grounding wire with a cross-sectional area of ​​95 square millimeters.

8. The dual-current vehicle grounding circuit according to claim 6, characterized in that: The vehicle body includes a traction transformer, which is connected to a fourth grounding bus, which is also connected to the wheels. The traction transformer and the fourth grounding bus are connected by a grounding wire with a cross-sectional area of ​​50 square millimeters, and the fourth grounding bus and the wheels are connected by a grounding wire with a cross-sectional area of ​​50 square millimeters.

9. The dual-current vehicle grounding circuit according to claim 6, characterized in that: The vehicle body includes a traction transformer and a traction converter. The grounding end of the traction converter is connected to the second grounding bus, which is connected to the first grounding bus through a grounding wire. The first grounding bus is connected to the wheels. The traction transformer is connected to the fourth grounding bus, which is also connected to the wheels. The traction converter and the second grounding bus are connected by a grounding wire with a cross-sectional area of ​​120 square millimeters. The first grounding bus and the traction transformer, and the first grounding bus and the fourth grounding bus are connected by a grounding wire with a cross-sectional area of ​​50 square millimeters. The fourth grounding bus and the wheels are connected by a grounding wire with a cross-sectional area of ​​50 square millimeters.

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