CN216969360U - Train power supply cabinet with ground resistance loop and railway passenger train - Google Patents
Train power supply cabinet with ground resistance loop and railway passenger train Download PDFInfo
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- CN216969360U CN216969360U CN202220019992.2U CN202220019992U CN216969360U CN 216969360 U CN216969360 U CN 216969360U CN 202220019992 U CN202220019992 U CN 202220019992U CN 216969360 U CN216969360 U CN 216969360U
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Abstract
The utility model discloses a train power supply cabinet with a ground resistance loop and a railway passenger train, wherein the power supply cabinet comprises: a first power supply cabinet LG1 and a second power supply cabinet LG2 which are respectively connected with a vehicle load; the first power supply cabinet LG1 comprises a first alternating current power supply circuit and a first grounding resistor GRe1, wherein one side of the first alternating current power supply circuit is connected with a vehicle load to provide a first path of alternating current for the vehicle load, and the other side of the first alternating current power supply circuit is grounded through the first grounding resistor GRe 1; the second power supply cabinet LG2 comprises a second alternating current power supply circuit and a second grounding resistor GRe2, wherein one side of the second alternating current power supply circuit is connected with the vehicle load to provide a second path of alternating current for the vehicle load, and the other side of the second alternating current power supply circuit is grounded through the second grounding resistor GRe 2. The two paths of alternating current power supply circuits of the train power supply cabinet are electrically independent from each other, and the problem that electric leakage cannot be correctly detected is solved by adding the grounding resistor in the grounding loop.
Description
Technical Field
The utility model relates to the technical field of train power supply, in particular to a train power supply cabinet with a grounding resistance loop and a railway passenger train.
Background
The train power supply for the railway passenger train adopts the mode of centralized power supply of electric locomotives, at present, a power supply loop of a train power supply cabinet is mostly adopted on the side of the train, the power supply loop can commonly share N lines of two groups of alternating current circuits, when two points of the locomotive side are grounded under the condition, the electric leakage cannot be correctly detected, and 2 power supply systems can simultaneously detect the ground fault when the ground fault occurs, so that the 2 power supply systems are simultaneously stopped. In addition, in the traditional technology, a power supply mode that a generator car drives a generator to supply power is adopted, but the generator is easily grounded, and the corresponding grounding function is placed in a carriage for detection because the inside of the generator is not grounded, but the sensitivity and the accuracy of the detection mode are poor.
Disclosure of Invention
Therefore, the train power supply cabinet with the grounding resistance loop is particularly provided to prevent the problems.
In order to realize the purpose, the technical scheme of the utility model is as follows:
a train power supply cabinet with a ground resistance loop, the power supply cabinet comprising: a first power supply cabinet LG1 and a second power supply cabinet LG2 which are respectively connected with a vehicle load; the first power supply cabinet LG1 comprises a first alternating current power supply circuit and a first grounding resistor GRe1, wherein the first alternating current power supply circuit is connected with a vehicle load on one side to provide alternating current of a first path for the vehicle load, and the other side is grounded through the first grounding resistor GRe 1; the second power supply cabinet LG2 comprises a second alternating current power supply circuit and a second grounding resistor GRe2, wherein one side of the second alternating current power supply circuit is connected with the vehicle load to provide a second path of alternating current for the vehicle load, and the other side of the second alternating current power supply circuit is grounded through the second grounding resistor GRe 2.
Optionally, in one embodiment, the first ac power supply circuit includes at least a first multi-phase transformer Tr1, a first ac output contactor ACMK1, a first leakage current sensor GCT 1; the first ac output contactor ACMK1 is connected to a power supply bus of a vehicle load, and supplies three-phase ac power to the vehicle load through a first power supply contactor K1 on one side of the power supply bus of the vehicle, and phase N of the first multi-phase transformer Tr1 is connected to a first ground resistor GRe1 through a first current sensor GCT1 and is grounded.
Optionally, in one embodiment, the second ac power supply circuit includes at least a second multi-phase transformer Tr2, a second ac output contactor ACMK2, a second leakage current sensor GCT 2; the second ac output contactor ACMK2 is connected to another power supply bus of the vehicle load, and supplies three-phase ac power to the vehicle load through a second power supply contactor K2 on the vehicle power supply bus side of the second ac output contactor ACMK2, and the phase N of the second multi-phase transformer Tr2 is connected to a second ground resistor GRe2 through a second current sensor GCT2 and is grounded.
Optionally, in one embodiment, the resistance of the first ground resistor GRe 1/the second ground resistor GRe2 is 20 ohms.
Based on the same inventive concept, the utility model also provides a railway passenger car with the train power supply cabinet.
The embodiment of the utility model has the following beneficial effects:
firstly, two paths of the train power supply cabinet are electrically independent from each other, two paths of outputs are respectively connected with two paths of power supply buses of a vehicle load, the other path of normal power supply is not influenced when a single path fails, the whole train is in load shedding operation, and the other path of power supply is responsible for supplying power to the whole train; secondly, the problem that the electric leakage cannot be correctly detected is solved through a newly designed power supply circuit, particularly a circuit added with a grounding resistor, while the structure and the power supply circuit of the original train power supply cabinet are not changed, namely the utility model has the advantages of saving maintenance cost and not influencing the normal work of the complete circuit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Wherein:
FIG. 1 is a block diagram of a structural framework for implementing a train power cabinet in one embodiment;
FIG. 2 is a schematic frame diagram of a train power supply cabinet (adding ground resistance) technology implemented in one embodiment;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present application. The first and second elements are both elements, but they are not the same element.
In the embodiment, a train power supply cabinet with a ground resistance loop is particularly provided, which is particularly suitable for being applied to dual-mode compatible train power supply; as shown in fig. 1-2, the train power supply cabinet is characterized in that the power supply cabinet comprises: a first power supply cabinet LG1 and a second power supply cabinet LG2 which are respectively connected with a vehicle load; the first power supply cabinet LG1 comprises a first alternating current power supply circuit and a first grounding resistor GRe1, wherein the first alternating current power supply circuit is connected with a vehicle load on one side to provide alternating current of a first path for the vehicle load, and the other side is grounded through the first grounding resistor GRe 1; the second power supply cabinet LG2 comprises a second alternating current power supply circuit and a second grounding resistor GRe2, wherein one side of the second alternating current power supply circuit is connected with the vehicle load to provide a second path of alternating current for the vehicle load, and the other side of the second alternating current power supply circuit is grounded through the second grounding resistor GRe 2.
By the scheme, two paths of the train power supply cabinet are electrically independent, two paths of outputs are respectively connected with two paths of power supply buses, the other path of normal power supply is not influenced when a single path fails, the whole train is in load shedding operation, and the other path of power supply is responsible for supplying power to the whole train; meanwhile, in order to solve the problem that the leakage current cannot be correctly detected due to the fact that the N-phase current in the conventional design returns to the N phase through the grounding loop, the size of an original train power supply device is kept unchanged, an existing mechanical interface and a cooling system interface are kept unchanged on the basis of ensuring that the overall work of a train power supply cabinet is not influenced through the circuit design with the grounding resistor, and the normal work of a complete loop is not influenced while the series flow of the N-phase current is avoided.
In some specific embodiments, the first ac power supply circuit includes at least a first multi-phase transformer Tr1, a first ac output contactor ACMK1, a first current transformer GCT 1; one side of the first alternating current output contactor ACMK1 is connected with a vehicle load (connected with a vehicle power supply bus 1 through a jumper cable between a locomotive and a vehicle), and the other side of the first alternating current output contactor ACMK1 is connected with a first multi-phase transformer Tr 1; the other side of the first multi-phase transformer Tr1 is connected to a first ground resistor GRe1 through a first current transformer GCT 1. As shown in fig. 2, three output terminals of the first multiphase transformer Tr1 are respectively connected to the 153, 154, 155 contacts of the first ac output contactor ACMK 1; one end of a neutral point of the first multi-phase transformer Tr1 is connected with a 156 contact of a direct current power supply-first alternating current output contactor ACMK1, and the other end of the neutral point of the first multi-phase transformer Tr1 is connected with a first current transformer GCT 1; the other end of the first current transformer GCT1 is connected with a first grounding resistor GRe 1; the other end of the first grounding resistor GRe1 is grounded; the other end of the 153, 154 and 155 contacts of the first alternating current output contactor ACMK1 is coupled with the input end of a first power supply contactor K1; three output terminals of the first power supply contactor K1 are coupled with a vehicle load; the other end of the 156 contact of the first alternating current contactor ACMK1 is connected with a vehicle load; based on the above structure, the first ac output contactor ACMK1 of the present circuit is connected to the vehicle power supply bus 1 through a jumper cable between the locomotive and the vehicle, and supplies 3-phase ac power to the vehicle load through the first power supply contactor K1 on the vehicle power supply bus 1 side, and outputs N phases of the first multi-phase transformer Tr1 in the first ac power supply circuit that returns to the first power supply cabinet LG1 through a rail between the locomotive and the vehicle, and the N phase of the first multi-phase transformer Tr1 is connected to the first ground resistor GRe1 through the first current sensor GCT1 and grounded.
In some specific embodiments, the second ac power supply circuit includes at least a second multi-phase transformer Tr2, a second ac output contactor ACMK2, a second current transformer GCT 2; one side of the second alternating current output contactor ACMK2 is connected with a vehicle load, and the other side of the second alternating current output contactor ACMK2 is connected with a second multi-phase transformer Tr 2; the other side of the second multi-phase transformer Tr2 is connected with a second ground resistor GRe2 through a second current transformer GCT 2; as shown in fig. 2, three output terminals of the second multiphase transformer Tr2 are respectively connected to the 153, 154, 155 contacts of the second ac output contactor ACMK 2; one end of a neutral point of the second multi-phase transformer Tr2 is connected with a 156 contact of a second alternating current output contactor ACMK2, and the other end of the neutral point of the second multi-phase transformer Tr2 is connected with a second current transformer GCT 2; the other end of the second current transformer GCT2 is connected with a second grounding resistor GRe 2; the other end of the second grounding resistor GRe2 is grounded; the other end of the 153, 154 and 155 contacts of the second alternating current output contactor ACMK2 is coupled with the input end of a second power supply contactor K2; three output terminals of the second power supply contactor K2 are coupled with vehicle load output terminals; the other end of the 156 contact of the second ac output contactor ACMK2 is connected to both the 156 contact of the first ac output contactor ACMK1 and the vehicle load. Based on the above structure, the second ac output contactor ACMK2 of the present circuit is connected to the vehicle power supply bus 2 through a jumper cable between the locomotive and the vehicle, and supplies 3-phase ac power to the vehicle load through the second power supply contactor K2 on the vehicle power supply bus 2 side, and returns to the ac power supply circuit of the second power supply cabinet LG2 through a rail between the vehicle and the locomotive to output N-phase of the second multi-phase transformer Tr2, and the N-phase of the second multi-phase transformer Tr2 is connected to the second ground resistor GRe2 through the second current sensor GCT2 and grounded. The first current sensor GCT1 and the second current sensor GCT2 are respectively used for detecting leakage current in the power supply circuit in which the current sensors are located.
Above-mentioned train power supply cabinet of realizing not only can effectively be the train power supply, can also avoid the leakage current false detection simultaneously detecting the earth fault of each system, and its corresponding technological principle is:
as shown in fig. 2, the N-phase current direction is shown by a thick line, and the N-phase current is doped during the leakage current detection, and the error is generated in the leakage current detection due to the fact that the N-phase current enters the ground loop, thereby causing the false detection; the problem of N-phase current interference is solved by a circuit designed in the power supply cabinet and two additional grounding resistors.
Therefore, two grounding resistors connected in parallel with each other are added to the two ac power supply circuits, for example, a 20 Ω grounding resistor is added to the grounding circuit corresponding to the ac power supply circuit of each power supply cabinet, and as shown in fig. 1, the N-phase current does not pass through the grounding circuit because the two newly added grounding resistors have impedance. Therefore, the problem of leakage current detection caused by the fact that N-phase current enters a grounding loop is solved; and selecting a 20 ohm ground resistance does not affect the leakage detection performance. Since if the current leakage detection value is 300mA, it means that it is necessary to detect leakage of (400V/V3) ÷ 0.3A ═ 770 Ω, and the ground resistance is only 20 Ω, the difference is only 2.6%, and detection is performed when the degree of leakage reaches 750 Ω, hardly affecting the leakage detection performance.
The grounding resistance is selected to be 20 Ω because the resistance is suitable for most locomotive power supply cabinets, and the specific calculation formula is as follows:
Rlc＝(Urms/√3)/Ilc
Re＝Rlc×Ke
wherein, UrmsRepresenting the voltage of the power supply system, IlcIndicating a leakage detection threshold, RlcIndicating a leakage detection threshold IlcCorresponding equivalent impedance, ReRepresenting the resistance of the ground resistance, its corresponding proportionality coefficient KeThe range of the value is usually 2% to 5%.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (5)
1. A train power supply cabinet with a ground resistance loop, the power supply cabinet comprising: a first power supply cabinet LG1 and a second power supply cabinet LG2 which are respectively connected with a vehicle load; the first power supply cabinet LG1 comprises a first alternating current power supply circuit and a first grounding resistor GRe1, wherein one side of the first alternating current power supply circuit is connected with a vehicle load and used for providing alternating current of a first path for the vehicle load, and the other side of the first alternating current power supply circuit is grounded through the first grounding resistor GRe 1; the second power supply cabinet LG2 comprises a second alternating current power supply circuit and a second grounding resistor GRe2, wherein one side of the second alternating current power supply circuit is connected with the vehicle load and used for providing a second path of alternating current for the vehicle load, and the other side of the second alternating current power supply circuit is grounded through the second grounding resistor GRe 2.
2. The train power supply cabinet with ground resistance loop of claim 1,
the first alternating current power supply circuit at least comprises a first multi-phase transformer Tr1, a first alternating current output contactor ACMK1 and a first leakage current sensor GCT 1; the first ac output contactor ACMK1 is connected to a power supply bus of a vehicle load, and supplies three-phase ac power to the vehicle load through a first power supply contactor K1 on one side of the power supply bus of the vehicle, and phase N of the first multi-phase transformer Tr1 is connected to a first ground resistor GRe1 through a first current sensor GCT1 and is grounded.
3. The train power supply cabinet with ground resistance loop of claim 1,
the second alternating current power supply circuit at least comprises a second multi-phase transformer Tr2, a second alternating current output contactor ACMK2 and a second leakage current sensor GCT 2; the second ac output contactor ACMK2 is connected to another power supply bus of the vehicle load, and supplies three-phase ac power to the vehicle load through a second power supply contactor K2 on the vehicle power supply bus side of the second ac output contactor ACMK2, and the phase N of the second multi-phase transformer Tr2 is connected to a second ground resistor GRe2 through a second current sensor GCT2 and is grounded.
4. The train power supply cabinet with ground resistance loop as claimed in claim 1, wherein the resistance value of the first ground resistance GRe 1/second ground resistance GRe2 is 20 ohm.
5. A railway passenger car characterized by comprising the train power supply cabinet according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220019992.2U CN216969360U (en) | 2022-01-06 | 2022-01-06 | Train power supply cabinet with ground resistance loop and railway passenger train |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220019992.2U CN216969360U (en) | 2022-01-06 | 2022-01-06 | Train power supply cabinet with ground resistance loop and railway passenger train |
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| Publication Number | Publication Date |
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| CN216969360U true CN216969360U (en) | 2022-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220019992.2U Active CN216969360U (en) | 2022-01-06 | 2022-01-06 | Train power supply cabinet with ground resistance loop and railway passenger train |
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| CN (1) | CN216969360U (en) |
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