Movable railway 10kV power system emergency power supply equipment

Abstract

The utility model discloses a movable emergency power supply device for a railway 10kV power system. The equipment comprises a pantograph, a single-phase step-down transformer, a rectifier, an inverter, a three-phase step-up transformer, a 10kV output cable, a three-phase 10kV-to-three-phase 380V transformer, a 380V output cable, a first 10kV three-phase circuit breaker and a second 10kV three-phase circuit breaker. The pantograph takes electricity from a 27.5 kV contact network of a railway traction power supply system, the electricity is input into the rectifier to be converted into direct current after being subjected to voltage reduction through the single-phase step-down transformer, then the direct current is inverted into three-phase alternating current with stable voltage through the inverter, the alternating current side of the inverter is connected with the low-voltage side of the step-up transformer, and the step-up transformer outputs a 10kV power supply which is transmitted to an emergency power supply user through a cable. And meanwhile, the power supply capability of converting 10kV into 380V is improved. With mobile emergency power supply as a target, emergency power supply guarantee for emergency rescue and disaster relief can be provided in a 27.5 kV traction power supply section of a railway.

Description

Technical Field

[0001] The utility model relates to the technical field of railway 10kV power system and electrified railway traction power supply, in particular to a movable railway 10kV power system emergency power supply equipment. Background Art

[0002] Emergency power supply for stations and work areas along the railway has always been an important guarantee for ensuring the normal transportation order of the railway. The railway system has always adopted a 10kV through-line and a 10kV self-closing line as a backup mode to ensure power supply. However, due to objective factors such as emergencies, other disasters, and misoperation, there are still unplanned power outages in the 10kV power system along the railway. With the development of railway construction, many railway passenger and freight hubs have been built, and the problem of power supply security in railway hubs needs to be solved urgently.

[0003] Railway hubs can increase the power supply capacity of local power companies as emergency power supply, but this plan will cause the power system capacity resources to be idle for a long time, resulting in a waste of social resources, and the railway companies will bear the basic electricity charges for emergency power supply for a long time, which is less economical. Railway hubs have electrified railway traction power supply systems, which can convert the single-phase 27.5kV traction power supply system to three-phase 10kV nearby to provide emergency power supply capacity for railway hubs. There is no need for local power companies to invest resources, and the railway department does not need to bear the basic electricity charges for additional emergency power supply for a long time. It is a very economical and feasible emergency power supply plan.

[0004] However, the line mileage under the jurisdiction of each railway enterprise is basically several thousand or even tens of thousands of kilometers. The existing 10kV power system emergency power supply equipment has a limited scope of use and cannot meet the emergency power supply needs after the power outage caused by sudden disasters in the 10kV power system along the railway. If 10kV power system emergency power supply equipment is installed at each station, the investment scale is relatively large, and the probability of sudden incidents is low. Therefore, it is necessary to propose a mobile railway 10kV power system emergency power supply equipment to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a movable railway 10kV power system emergency power supply equipment to solve the problem that the existing 10kV power system emergency power supply equipment has a limited scope of use and cannot meet the emergency power supply needs after a power outage caused by a sudden disaster in the 10kV power system along the railway.

[0006] The utility model provides a movable railway 10kV power system emergency power supply equipment including: a pantograph, a single-phase step-down transformer, a rectifier, an inverter, a three-phase step-up transformer, a 10kV output cable, a three-phase 10kV to three-phase 380V transformer, a 380V output cable, a first 10kV three-phase circuit breaker, and a second 10kV three-phase circuit breaker;

[0007] The pantograph is connected to a single-phase step-down transformer, and the single-phase step-down transformer is connected to a rectifier; the high-voltage side and the low-voltage side of the single-phase step-down transformer are commonly grounded and connected to the transformer casing; the DC sides of the rectifier and the inverter are connected through a DC bus; the three-phase AC side of the inverter is connected to the three-phase low-voltage side of the step-up transformer; the high-voltage side of the step-up transformer is connected to a first 10kV three-phase circuit breaker and a second 10kV three-phase circuit breaker; the first 10kV three-phase circuit breaker is connected to a 10kV output cable; the second 10kV three-phase circuit breaker is connected to the high-voltage side of a three-phase 10kV to three-phase 380V transformer; the low-voltage side of the three-phase 10kV to three-phase 380V transformer is connected to a 380V output cable.

[0008] Furthermore, the movable railway 10kV power system emergency power supply equipment also includes: a measurement and control unit; a first voltage transformer is connected between the pantograph and the single-phase step-down transformer, the measuring end of the first voltage transformer is connected to the input interface of the measurement and control unit, and the output interface of the measurement and control unit is respectively connected to the control end of the rectifier and the control end of the inverter.

[0009] Furthermore, a first current transformer is connected between the pantograph and the single-phase step-down transformer, and a measuring end of the first current transformer is connected to an input interface of the measurement and control unit.

[0010] Furthermore, a second voltage transformer is connected between the three-phase step-up transformer and the first 10kV three-phase circuit breaker, and a measuring end of the second voltage transformer is connected to an input interface of the measurement and control unit.

[0011] Furthermore, a second current transformer is connected between the three-phase step-up transformer and the first 10kV three-phase circuit breaker, and a measuring end of the second current transformer is connected to an input interface of the measurement and control unit.

[0012] The utility model has the following beneficial effects: the portable railway 10kV power system emergency power supply equipment of the utility model, the pantograph takes power from the 27.5kV contact network of the railway traction power supply system, after the single-phase step-down transformer steps down the voltage, the input rectifier converts it into direct current, and then it is inverted into a three-phase alternating current with stable voltage through the inverter, the alternating current side of the inverter is connected to the low-voltage side of the step-up transformer, the step-up transformer outputs 10kV power supply through the current to the emergency power supply user, and at the same time increases the 10kV to 380V power supply capacity. With the portable emergency power supply as the goal, it can provide emergency power supply guarantee for disaster relief in the section with railway 27.5kV traction power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 The utility model provides a schematic diagram of a movable railway 10kV power system emergency power supply device.

[0015] Illustration: 1- pantograph; 2- 27.5kV contact network of railway traction power supply system; 3- single-phase step-down transformer; 4- rectifier; 5- inverter; 6- three-phase step-up transformer; 7- 10kV output cable; 8- three-phase 10kV to three-phase 380V transformer; 9- 380V output cable; 10- first 10kV three-phase circuit breaker; 11- second 10kV three-phase circuit breaker; 12- measurement and control unit; 13- first voltage transformer; 14- first current transformer; 15- second voltage transformer; 16- second current transformer. DETAILED DESCRIPTION

[0016] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those of ordinary skill in the art to which the present application belongs.

[0017] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0018] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for clarity, the thickness of the layers and regions is enlarged, and the same reference numerals are used to represent the same devices, so their description will be omitted.

[0019] See also Figure 1 The embodiment of the utility model provides a movable railway 10kV power system emergency power supply equipment, including: a pantograph 1, a single-phase step-down transformer 3, a rectifier 4, an inverter 5, a three-phase step-up transformer 6, a 10kV output cable 7, a three-phase 10kV to three-phase 380V transformer 8, a 380V output cable 9, a first 10kV three-phase circuit breaker 10, a second 10kV three-phase circuit breaker 11, a measurement and control unit 12, a first voltage transformer 13, a first current transformer 14, a second voltage transformer 15, and a second current transformer 16.

[0020] Among them, the pantograph 1 is connected to the single-phase step-down transformer 3, and the single-phase step-down transformer 3 is connected to the rectifier 4; the high-voltage side and the low-voltage side of the single-phase step-down transformer 3 are commonly grounded and connected to the transformer casing; the DC sides of the rectifier 4 and the inverter 5 are connected through a DC bus; the three-phase AC side of the inverter 5 is connected to the three-phase low-voltage side of the step-up transformer 6; the high-voltage side of the step-up transformer 6 is connected to the first 10kV three-phase circuit breaker 10 and the second 10kV three-phase circuit breaker 11; the first 10kV three-phase circuit breaker 10 is connected to the 10kV output cable 7; the second 10kV three-phase circuit breaker 11 is connected to the high-voltage side of the three-phase 10kV to three-phase 380V transformer 8; the low-voltage side of the three-phase 10kV to three-phase 380V transformer 8 is connected to the 380V output cable 9.

[0021] A first voltage transformer 13 and a first current transformer 14 are connected between the pantograph 1 and the single-phase step-down transformer 3 , and a second voltage transformer 15 and a second current transformer 16 are connected between the three-phase step-up transformer 6 and the first 10 kV three-phase circuit breaker 10 .

[0022] The measuring ends of the first voltage transformer 13, the first current transformer 14, the second voltage transformer 15 and the second current transformer 16 are respectively connected to the input interface of the measurement and control unit 12, and the output interface of the measurement and control unit 12 is respectively connected to the control end of the rectifier 4 and the control end of the inverter 5.

[0023] The working principle of the portable railway 10kV power system emergency power supply equipment of the utility model is as follows:

[0024] The pantograph 1 takes power from the 27.5kV overhead line 2 of the railway traction power supply system, and connects the 27.5kV single-phase AC power to the high-voltage side of the single-phase step-down transformer 3; the single-phase step-down transformer 3 steps down the 27.5kV single-phase AC power to the single-phase power suitable for the operation of the rectifier 4, and outputs it to the AC side of the rectifier 4. The high-voltage side and the low-voltage side of the single-phase step-down transformer 3 are grounded and connected to the transformer casing; the DC side of the rectifier 4 and the inverter 5 are connected through the DC bus to realize the AC-DC-AC conversion of rectifying the single-phase AC power into DC power and then inverting it into three-phase AC power. The rectifier 4 and the inverter 5 can also have a power bidirectional integration function. The three-phase AC side of the inverter 5 is connected to the three-phase low-voltage side of the step-up transformer 6, and the step-up transformer 6 steps up the three-phase AC power output by the inverter 5 to three-phase 10kV. The high-voltage side of the step-up transformer 6 is connected to a 10kV three-phase circuit breaker, the first 10kV three-phase circuit breaker 10 is connected to a 10kV output cable 7 to provide 10kV power supply to the outside, the second 10kV three-phase circuit breaker 11 is connected to the high-voltage side of the three-phase 10kV to three-phase 380V transformer 8; the low-voltage side of the three-phase 10kV to three-phase 380V transformer 8 is connected to a 380V output cable. The measuring ends of the first voltage transformer 13 and the second voltage transformer 15, and the measuring ends of the first current transformer 14 and the second current transformer 16 are connected to the input interface of the measurement and control unit 12. The output interface of the measurement and control unit 12 is connected to the control end of the rectifier 4 and the inverter 5, and can also receive data or information from the control end of the rectifier 4 and the inverter 5, such as the working status data of the rectifier 4 and the inverter 5, the real-time data of the input and output voltage and current, and the real-time data of the power quality. The measurement and control unit 12 mainly realizes the functions of coordinating the reliable operation of various system components, such as system power on and off control, protection control, output power and power quality control, and power integration direction control.

[0025] According to the needs of railway enterprises, the utility model can also cancel the pantograph 1 and replace it with a ground fixed installation. At the same time, it can also access new energy such as photovoltaics in the DC link of AC-DC-AC conversion to expand the application scenarios of emergency power supply equipment of the railway 10kV power system.

[0026] In addition, the utility model can also be used in parallel with multiple portable railway 10kV power system emergency power supply equipment to increase the emergency power supply capacity. When multiple portable railway 10kV power system emergency power supply equipment are used in parallel, they can be used in parallel as independent systems, and the 12 measurement and control units need to work together to distinguish between the master and slave machines, so as to facilitate the synchronous operation of the system and the synchronous control of the output AC phase.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0029] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A mobile railway 10kV power system emergency power supply equipment, characterized in that: include: Pantograph (1), single-phase step-down transformer (3), rectifier (4), inverter (5), three-phase step-up transformer (6), 10 kV output cable (7), three-phase 10 kV to three-phase 380 V transformer (8), 380 V output cable (9), first 10 kV three-phase circuit breaker (10), second 10 kV three-phase circuit breaker (11); The pantograph (1) is connected to a single-phase step-down transformer (3), and the single-phase step-down transformer (3) is connected to a rectifier (4); the high-voltage side and the low-voltage side of the single-phase step-down transformer (3) are connected to a common ground and are connected to a transformer casing; the DC sides of the rectifier (4) and the inverter (5) are connected via a DC bus; the three-phase AC side of the inverter (5) is connected to the three-phase low-voltage side of the step-up transformer (6); the high-voltage side of the step-up transformer (6) is connected to a first 10kV three-phase circuit breaker (10) and a second 10kV three-phase circuit breaker (11); the first 10kV three-phase circuit breaker (10) is connected to a 10kV output cable (7); the second 10kV three-phase circuit breaker (11) is connected to the high-voltage side of a three-phase 10kV to three-phase 380V transformer (8); and the low-voltage side of the three-phase 10kV to three-phase 380V transformer (8) is connected to a 380V output cable (9).

2. The mobile railway 10kV power system emergency power supply equipment according to claim 1, characterized in that: Also includes: A measurement and control unit (12); a first voltage transformer (13) is connected between the pantograph (1) and the single-phase step-down transformer (3); a measurement end of the first voltage transformer (13) is connected to an input interface of the measurement and control unit (12); and an output interface of the measurement and control unit (12) is respectively connected to a control end of the rectifier (4) and a control end of the inverter (5).

3. The mobile railway 10kV power system emergency power supply equipment according to claim 1, characterized in that: A first current transformer (14) is connected between the pantograph (1) and the single-phase step-down transformer (3), and a measuring end of the first current transformer (14) is connected to an input interface of a measurement and control unit (12).

4. The mobile railway 10kV power system emergency power supply equipment according to claim 1, characterized in that: A second voltage transformer (15) is connected between the three-phase step-up transformer (6) and the first 10kV three-phase circuit breaker (10), and a measuring end of the second voltage transformer (15) is connected to an input interface of a measurement and control unit (12).

5. The mobile railway 10kV power system emergency power supply equipment according to claim 1, characterized in that: A second current transformer (16) is connected between the three-phase step-up transformer (6) and the first 10kV three-phase circuit breaker (10), and a measuring end of the second current transformer (16) is connected to an input interface of the measurement and control unit (12).

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