10 (35) / 27.5 kV power supply device for supplying power to electrical equipment of railway rolling stock

Abstract

The invention discloses a 10 (35) / 27.5 kV power supply device for supplying power to electrical equipment of a railway locomotive. Along with rapid development of electrified railways, motor train unit operation has higher requirements for a power supply system. The system comprises a 10 (35) kV and 27.5 kV incoming line and protection unit, a V / v wiring power transformer, a comprehensive measurement and control device and a feeder line and protection unit. The input end of the 10 (35) kV incoming line and protection unit is connected with a 10 (35) kV power system public network, and the output end of the 10 (35) kV incoming line and protection unit is connected with the primary side input end of the wiring power transformer; the input end of the 27.5 kV incoming line and protection unit is connected with a 27.5 kV overhead line system T-connection power source, and the output end of the 27.5 kV incoming line and protection unit is connected with a parking lot overhead line system through the feeder line and protection unit. Dual power supply access is adopted, the power demand for starting and stopping traction of the electric locomotive in the parking lot is met, and all-day uninterruptible power supply for the electric locomotive is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of AC electrified railway traction power supply, and in particular relates to a 10(35) / 27.5kV power supply device for supplying power to electrical equipment of railway locomotives and vehicles. Background Art

[0002] With the rapid development of electrified railways and high-speed railways, the demand for "early arrival and departure" of trains is increasing, and the operation and parking of EMUs have put forward higher requirements for the power supply system. During winter operation, EMUs need anti-freezing and heat preservation power supply, especially in parking scenarios such as depots. Due to long-term parking and overhead line suspension (skylight operation), the in-vehicle electrical equipment and heating system of the EMU need external power supply to maintain normal operation to prevent equipment from freezing or performance degradation. In order to meet the special power supply needs in scenarios such as EMU depots, the existing power supply solutions mostly use locomotive ground power supply or directly rely on 27.5kV power supply lines. Ground power supply cannot be used for locomotive traction and is difficult for daily operation and maintenance, while long-distance independent power supply lines have high investment and operation and maintenance costs. Depots usually have 10 (35) kV power grid access conditions, but the existing technology lacks a mature solution to convert 10 (35) kV voltage to 27.5 kV economically and efficiently. Therefore, there is an urgent need for a locomotive and vehicle electrical equipment power supply device that can utilize a 10 (35) kV power grid and take into account a 27.5 kV overhead line power supply to meet the diverse power supply needs of depots and EMU depots. Summary of the invention

[0003] In order to remedy the deficiencies of the prior art, the present invention provides a 10(35) / 27.5kV power supply device for powering the electrical equipment of railway locomotives and vehicles, which can, at a relatively low cost, provide dual power supply through a 27.5kV power supply and a 10(35)kV local public power supply via a contact network T-connection in certain scenarios where the power supply capacity of a traction substation is limited, taking into account the needs of EMU running and antifreeze insulation, and significantly improving the flexibility, safety and operating efficiency of the depot power supply system.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A 10(35) / 27.5kV power supply device for powering electrical equipment of railway locomotives and rolling stock, comprising a 10(35)kV incoming line and protection unit, a 27.5kV incoming line and protection unit, a V / v connection power transformer, a comprehensive measurement and control device, and a feeder and protection unit;

[0006] The input end of the 10 (35) kV incoming line and protection unit is connected to the 10 (35) kV power system public grid, and the output end is connected to the primary input end of the V / v connection power transformer, and the V / v connection power transformer is used to increase (or decrease) the 10 (35) kV voltage to 27.5 kV voltage; the input end of the 27.5 kV incoming line and protection unit is connected to the 27.5 kV contact network T-connected power supply, and the output end is connected to the parking lot contact network through the feeder and protection unit.

[0007] Furthermore, the 10(35)kV incoming line and protection unit includes a second electric disconnector, a first circuit breaker and a first current transformer, wherein the second electric disconnector is connected between the 10(35)kV power system public grid power supply line and the first circuit breaker; the first circuit breaker is connected between the second electric disconnector and the first current transformer; and the first current transformer is connected between the first circuit breaker and the primary input terminal of the V / v connected power transformer.

[0008] Furthermore, the 10(35)kV incoming line and protection unit also includes a first electric disconnector, a first lightning arrester, a first fuse and a first voltage transformer; the first electric disconnector is connected between the 10(35)kV power system public power supply line and the first lightning arrester; the first lightning arrester is connected between the first electric disconnector and the earth; the first fuse is connected between the first electric disconnector and the first voltage transformer; the first voltage transformer is connected to the first fuse outlet terminal.

[0009] Furthermore, the 27.5kV incoming line and protection unit includes a second lightning arrester, a third electric disconnector, a second circuit breaker, a third circuit breaker, and a second current transformer and a third current transformer; the second lightning arrester is connected between the contact network T-connected 27.5kV power supply and the earth; the third electric disconnector is connected between the contact network T-connected 27.5kV power supply and the second circuit breaker and the third circuit breaker; the second circuit breaker is connected between the third electric disconnector and the second current transformer; the third circuit breaker is connected between the third electric disconnector and the third current transformer.

[0010] Furthermore, the 27.5kV incoming line and protection unit also includes a fourth electric disconnector, a second fuse, and a second voltage transformer; the fourth electric disconnector is connected between the third electric disconnector and the second fuse; the second fuse is connected between the fourth electric disconnector and the second voltage transformer; and the second voltage transformer is connected to the second fuse.

[0011] Furthermore, the V / v connected power transformer is composed of a 10(35) / 27.5kV three-phase V / v connected power transformer; it is used to step up or down the 10(35)kV voltage to 27.5kV voltage, and its secondary output ports include two ports α and β, which are respectively connected to the input ends of the feeder and protection unit, and the output ends of the feeder and protection unit are respectively connected to the parking lot contact network of the section to which the power supply arms α and β belong.

[0012] Furthermore, the feeder and protection unit includes a fourth circuit breaker, a fifth circuit breaker, a fourth current transformer and a fifth current transformer; the fourth circuit breaker and the fifth circuit breaker are respectively connected between the secondary side α output port and the β output port of the V / v connected power transformer and the fourth current transformer and the fifth current transformer.

[0013] Furthermore, the feeder and protection unit also includes a fifth electric disconnector, a sixth electric disconnector, a third fuse, a fourth fuse and a third voltage transformer and a fourth voltage transformer; the fifth electric disconnector and the sixth electric disconnector are respectively connected between the secondary side α output port and the β output port of the V / v connected power transformer and the third fuse and the fourth fuse; the third fuse and the fourth fuse are respectively connected between the fifth electric disconnector and the sixth electric disconnector and the third voltage transformer and the fourth voltage transformer.

[0014] Furthermore, the feeder and protection unit also includes a seventh electric disconnector, an eighth electric disconnector, a ninth electric disconnector, a tenth electric disconnector, and a third lightning arrester and a fourth lightning arrester; the seventh electric disconnector and the eighth electric disconnector are respectively connected between the second current transformer, the fourth current transformer and the third lightning arrester; the ninth electric disconnector and the tenth electric disconnector are respectively connected between the third current transformer, the fifth current transformer and the fourth lightning arrester; the third lightning arrester and the fourth lightning arrester are respectively connected between the eighth electric disconnector, the ninth electric disconnector and the contact network.

[0015] Further, the integrated measurement and control device is composed of a data control processor, and the signal input end of the data control processor is respectively connected to the measurement signal output ends of the first current transformer, the second current transformer, the third current transformer, the fourth current transformer, the fifth current transformer, the first voltage transformer, the second voltage transformer, the third voltage transformer, and the fourth voltage transformer;

[0016] The signal output end of the data control processor is respectively connected to the control end of the 10(35)kV incoming line and protection unit, the 27.5kV incoming line and protection unit, the V / v connection power transformer, and the feeder and protection unit.

[0017] Beneficial effects of the present invention:

[0018] 1) The present invention adopts 10(35)kV and 27.5kV dual power supply access, with strong power supply reliability and flexibility. It does not need to set up long-distance power supply lines from the traction substation. It can not only meet the traction power demand of electric locomotives in the depot for starting and stopping, but also meet the power demand of non-traction loads such as antifreeze and heat preservation of trains during the vertical stop of the overhead line, ensuring uninterrupted power supply for electric locomotives all day long;

[0019] 2) The present invention adopts a modular structure, by integrating 10 (35) kV incoming line and protection unit, 27.5 kV incoming line and protection unit, V / v connection power transformer, comprehensive measurement and control device, feeder and protection unit. It is connected to the nearby contact network and 10 (35) kV power system public grid, has a simple structure, small footprint, more convenient equipment installation and maintenance, and has expansion capability, which is suitable for the power supply needs of parking lots of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the system structure of a 10(35) / 27.5kV power supply device for supplying power to electrical equipment of railway locomotives and vehicles provided in an embodiment of the present disclosure;

[0021] Figure 2 A main wiring structure diagram of a 10(35) / 27.5kV power supply device for powering electrical equipment of a railway locomotive and vehicle provided in an embodiment of the present disclosure;

[0022] Figure 3 A schematic diagram of the structure of the comprehensive measurement and control device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0023] The present invention is described in detail below in conjunction with specific implementation modes.

[0024] like Figure 1As shown, the 10(35) / 27.5kV power supply device for powering the electrical equipment of railway locomotives and vehicles comprises a 10(35)kV incoming line and protection unit, a 27.5kV incoming line and protection unit, a V / v connection power transformer, a comprehensive measurement and control device, and a feeder and protection unit; the input end of the 10(35)kV incoming line and protection unit is connected to the 10(35)kV power system public grid, and the output end thereof is connected to the primary input end of the V / v connection power transformer, the V / v connection power transformer is used to increase (decrease) the 10(35)kV voltage to 27.5kV voltage, and the secondary output ports thereof respectively comprise an α port and a β port; the α port and the β port are connected to the contact network of the depot through the feeder and protection unit; the input end of the 27.5kV incoming line and protection unit is connected to the 27.5kV contact network T-connected power supply, and the output end thereof is connected to the contact network of the depot through the feeder and protection unit. The V / v connected power transformer can greatly reduce the impact of negative sequence current on the 10(35)kV three-phase power system by stepping up (stepping down) the 10(35)kV incoming line to two 27.5kV power sources α and β with a phase difference of 60° to supply power to the contact networks of different tracks in the EMU depot.

[0025] In one embodiment, Figure 2 This is a schematic diagram of the main wiring of a 10(35) / 27.5kV power supply device for powering the electrical equipment of a railway locomotive and vehicle provided in an embodiment of the present disclosure. Figure 1 and Figure 2 As shown, the input end of the 10(35)kV incoming line and protection unit is connected to the 10(35)kV power system public grid, and the output end is connected to the primary input end of the V / v connected power transformer.

[0026] The 10(35)kV incoming line and protection unit includes a second electric disconnector, a first circuit breaker and a first current transformer, wherein the second electric disconnector is connected between the 10(35)kV power system public grid power supply line and the first circuit breaker; the first circuit breaker is connected between the second electric disconnector and the first current transformer; and the first current transformer is connected between the first circuit breaker and the primary input terminal of the V / v connected power transformer.

[0027] The 10(35)kV incoming line and protection unit also includes a first electric isolating switch, a first lightning arrester, a first fuse and a first voltage transformer. The first electric isolating switch is connected between the 10(35)kV power system public grid power supply line and the first lightning arrester; the first lightning arrester is connected between the first electric isolating switch and the earth; the first fuse is connected between the first electric isolating switch and the first voltage transformer; the first voltage transformer is connected to the outlet terminal of the first fuse. In this way, by obtaining the current and voltage signals flowing through the 10(35)kV incoming line and protection unit measured by the first current transformer and the first voltage transformer, the first circuit breaker can be used to cut off the line connection of the 10(35)kV incoming line and protection unit when a fault occurs. Among them, the first current transformer, the first voltage transformer and the first circuit breaker are all components with the above functions set for three-phase power supply. When the overvoltage reaches the action voltage limit, the first arrester will be activated and current will flow to limit the overvoltage amplitude. When the voltage value is lower than the action voltage limit, the first arrester will immediately return to its original state to ensure that the 10(35)kV incoming line and protection unit are normally powered on. The first fuse can be used for overcurrent protection.

[0028] The 27.5kV incoming line and protection unit include the second lightning arrester, the third electric disconnector, the second circuit breaker, the third circuit breaker, and the second current transformer and the third current transformer. The second lightning arrester is connected between the contact network T-connected 27.5kV power supply and the earth; the third electric disconnector is connected between the contact network T-connected 27.5kV power supply and the second circuit breaker and the third circuit breaker; the second circuit breaker is connected between the third electric disconnector and the second current transformer; the third circuit breaker is connected between the third electric disconnector and the third current transformer. When the overvoltage reaches the action voltage limit, the second lightning arrester is activated and current flows to limit the overvoltage amplitude. When the voltage value is lower than the action voltage limit, the second lightning arrester immediately returns to its original state to ensure normal power overload of the 27.5kV incoming line and protection unit.

[0029] The 27.5kV incoming line and protection unit also includes a fourth electric disconnector, a second fuse, and a second voltage transformer. The fourth electric disconnector is connected between the third electric disconnector and the second fuse; the second fuse is connected between the fourth electric disconnector and the second voltage transformer; and the second voltage transformer is connected to the second fuse. In this way, by obtaining the current and voltage signals flowing through the 27.5kV incoming line and protection unit measured by the second current transformer, the third current transformer, and the second voltage transformer, the second circuit breaker and the third circuit breaker can be used to cut off the line connection of the 27.5kV incoming line and protection unit when a fault occurs. Among them, the second current transformer, the third current transformer, the second voltage transformer, the second circuit breaker, and the third section circuit breaker are all components with the above functions set for single-phase power supply. The second fuse can be used for overcurrent protection.

[0030] The V / v connection power transformer is composed of a 10 / 27.5kV V / v connection, three-phase power transformer. It is used to step up (step down) the 10(35)kV voltage to 27.5kV. The output ports include two ports α and β, which are respectively connected to the input ends of the feeder and the protection unit. The output ends of the feeder and the protection unit are respectively connected to the parking lot contact network and rails of the sections to which the power supply arms α and β belong.

[0031] The feeder and protection unit includes a fourth circuit breaker, a fifth circuit breaker, a fourth current transformer and a fifth current transformer, wherein the fourth circuit breaker and the fifth circuit breaker are respectively connected between the secondary side α output port and the β output port of the V / v connection power transformer and the fourth current transformer and the fifth current transformer.

[0032] The feeder and protection unit also includes a fifth electric disconnector, a sixth electric disconnector, a third fuse, a fourth fuse, and a third voltage transformer and a fourth voltage transformer. The fifth electric disconnector and the sixth electric disconnector are respectively connected between the secondary side α output port and the β output port of the V / v connection power transformer and the third fuse and the fourth fuse; the third fuse and the fourth fuse are respectively connected between the fifth electric disconnector and the sixth electric disconnector and the third voltage transformer and the fourth voltage transformer.

[0033] In addition, the feeder and protection unit also include the seventh electric disconnector, the eighth electric disconnector, the ninth electric disconnector, the tenth electric disconnector, and the third lightning arrester and the fourth lightning arrester. The seventh electric disconnector and the eighth electric disconnector are respectively connected between the second current transformer, the fourth current transformer and the third lightning arrester; the ninth electric disconnector and the tenth electric disconnector are respectively connected between the third current transformer, the fifth current transformer and the fourth lightning arrester; the third lightning arrester and the fourth lightning arrester are respectively connected between the eighth electric disconnector and the ninth electric disconnector and the contact network. In this way, when the overvoltage reaches the action voltage limit, the third lightning arrester and the fourth lightning arrester are actuated to flow current to limit the overvoltage amplitude. When the voltage value is lower than the action voltage limit, the third lightning arrester and the fourth lightning arrester immediately return to their original state to ensure normal power overload of the feeder and the protection unit.

[0034] In one embodiment, Figure 3 A schematic diagram of the structure of the comprehensive measurement and control device provided in the embodiment of the present disclosure. Figure 1 , Figure 2As shown, the integrated measurement and control device is mainly composed of a data control processor, wherein the signal input end of the data control processor is respectively connected to the measurement signal output ends of the first current transformer, the second current transformer, the third current transformer, the fourth current transformer, the fifth current transformer, the first voltage transformer, the second voltage transformer, the third voltage transformer, and the fourth voltage transformer. The signal output end of the data control processor is respectively connected to the control end of the 10 (35) kV incoming line and protection unit, the 27.5 kV incoming line and protection unit, the V / v connection power transformer, and the feeder and protection unit. In this way, the integrated measurement and control device can monitor the working status of the 10(35) / 27.5kV power supply device for the electrical equipment of railway locomotives and vehicles in real time by obtaining the working status parameters of each functional unit module, including current, voltage and other parameters. Whether it is on the incoming line side (10(35)kV or 27.5kV) or the feeder side (contact network power supply line), when a fault occurs at any one of them, the integrated measurement and control device can cut off the connecting lines by controlling the incoming line and protection unit and the feeder and protection unit, interrupting power supply and power consumption, avoiding the expansion of the fault scope, and ensuring the safety of power supply and power consumption of electric traction loads.

[0035] The content of the present invention is not limited to the embodiments listed, and any equivalent changes made to the technical solution of the present invention by ordinary technicians in this field after reading the description of the present invention are covered by the claims of the present invention.

Claims

1. A 10(35) / 27.5kV power supply device for electric equipment of railway locomotives and rolling stock, characterized in that: It includes 10(35)kV incoming line and protection unit, 27.5kV incoming line and protection unit, V / v connection power transformer, integrated measurement and control device and feeder and protection unit; The input end of the 10 (35) kV incoming line and protection unit is connected to the 10 (35) kV power system public grid, and the output end is connected to the primary input end of the V / v connection power transformer, and the V / v connection power transformer is used to increase (or decrease) the 10 (35) kV voltage to 27.5 kV voltage; the input end of the 27.5 kV incoming line and protection unit is connected to the 27.5 kV contact network T-connected power supply, and the output end is connected to the parking lot contact network through the feeder and protection unit.

2. A 10(35) / 27.5kV power supply device for powering electrical equipment of railway locomotives and vehicles according to claim 1, characterized in that: The 10(35)kV incoming line and protection unit includes a second electric isolating switch, a first circuit breaker and a first current transformer, wherein the second electric isolating switch is connected between the 10(35)kV power system public grid power supply line and the first circuit breaker; the first circuit breaker is connected between the second electric isolating switch and the first current transformer; the first current transformer is connected between the first circuit breaker and the primary input end of the V / v connected power transformer.

3. A 10(35) / 27.5kV power supply device for powering electrical equipment of railway locomotives and vehicles according to claim 2, characterized in that: The 10(35)kV incoming line and protection unit also includes a first electric disconnector, a first lightning arrester, a first fuse and a first voltage transformer; the first electric disconnector is connected between the 10(35)kV power system public grid power supply line and the first lightning arrester; the first lightning arrester is connected between the first electric disconnector and the earth; the first fuse is connected between the first electric disconnector and the first voltage transformer; the first voltage transformer is connected to the first fuse outlet terminal.

4. A 10(35) / 27.5kV power supply device for powering electrical equipment of railway locomotives and vehicles according to claim 3, characterized in that: The 27.5kV incoming line and protection unit includes a second lightning arrester, a third electric disconnector, a second circuit breaker, a third circuit breaker, and a second current transformer and a third current transformer; the second lightning arrester is connected between the contact network T-connected 27.5kV power supply and the earth; the third electric disconnector is connected between the contact network T-connected 27.5kV power supply and the second circuit breaker and the third circuit breaker; the second circuit breaker is connected between the third electric disconnector and the second current transformer; the third circuit breaker is connected between the third electric disconnector and the third current transformer.

5. A 10(35) / 27.5kV power supply device for powering electrical equipment of railway locomotives and vehicles according to claim 4, characterized in that: The 27.5kV incoming line and protection unit also includes a fourth electric isolating switch, a second fuse, and a second voltage transformer; the fourth electric isolating switch is connected between the third electric isolating switch and the second fuse; the second fuse is connected between the fourth electric isolating switch and the second voltage transformer; and the second voltage transformer is connected to the second fuse.

6. A 10(35) / 27.5kV power supply device for powering electrical equipment of railway locomotives and vehicles according to claim 5, characterized in that: The V / v connected power transformer is composed of a 10(35) / 27.5kV three-phase V / v connected power transformer; it is used to step up or down the 10(35)kV voltage to 27.5kV voltage, and its secondary output ports include two ports α and β, which are respectively connected to the input ends of the feeder and protection unit, and the output ends of the feeder and protection unit are respectively connected to the parking lot contact network of the section to which the power supply arms α and β belong.

7. A 10(35) / 27.5kV power supply device for powering electrical equipment of railway locomotives and vehicles according to claim 6, characterized in that: The feeder and protection unit includes a fourth circuit breaker, a fifth circuit breaker, a fourth current transformer and a fifth current transformer; the fourth circuit breaker and the fifth circuit breaker are respectively connected between the secondary side α output port and the β output port of the V / v connection power transformer and the fourth current transformer and the fifth current transformer.

8. A 10(35) / 27.5kV power supply device for powering electrical equipment of railway locomotives and vehicles according to claim 7, characterized in that: The feeder and protection unit also includes a fifth electric disconnector, a sixth electric disconnector, a third fuse, a fourth fuse and a third voltage transformer and a fourth voltage transformer; the fifth electric disconnector and the sixth electric disconnector are respectively connected between the secondary side α output port and the β output port of the V / v connected power transformer and the third fuse and the fourth fuse; the third fuse and the fourth fuse are respectively connected between the fifth electric disconnector and the sixth electric disconnector and the third voltage transformer and the fourth voltage transformer.

9. A 10(35) / 27.5kV power supply device for powering electrical equipment of railway locomotives and vehicles according to claim 8, characterized in that: The feeder and protection unit also includes a seventh electric disconnector, an eighth electric disconnector, a ninth electric disconnector, a tenth electric disconnector, and a third lightning arrester and a fourth lightning arrester; the seventh electric disconnector and the eighth electric disconnector are respectively connected between the second current transformer, the fourth current transformer and the third lightning arrester; the ninth electric disconnector and the tenth electric disconnector are respectively connected between the third current transformer, the fifth current transformer and the fourth lightning arrester; the third lightning arrester and the fourth lightning arrester are respectively connected between the eighth electric disconnector, the ninth electric disconnector and the contact network.

10. A 10(35) / 27.5kV power supply device for powering electrical equipment of railway locomotives and vehicles according to claim 9, characterized in that: The comprehensive measurement and control device is composed of a data control processor, and the signal input end of the data control processor is respectively connected to the measurement signal output ends of the first current transformer, the second current transformer, the third current transformer, the fourth current transformer, the fifth current transformer, the first voltage transformer, the second voltage transformer, the third voltage transformer, and the fourth voltage transformer; The signal output end of the data control processor is respectively connected to the control end of the 10(35)kV incoming line and protection unit, the 27.5kV incoming line and protection unit, the V / v connection power transformer, and the feeder and protection unit.

Images