A railway power supply backflow prevention device

Abstract

The utility model discloses a railway substation power supply backflow prevention device, which relates to the railway power supply technology field, including a shell, the shell is installed at the power supply, the two sides of the shell are penetrated by the main line, the main line is located in the shell and is divided into a front line and a rear line, the front line and the rear line are provided with a terminal block, the two terminal blocks are provided with a terminal post, the terminal post on the front line is fixed with a PN junction, a magnetic coil is provided between the two terminal posts, an opening and closing seat is fixed on the rear line, the rear line is located in the built-in cavity in a disconnected state, and a power connection slot is fixed at the break, a stand is fixed on the upper end of the opening and closing seat, a spring plate is fixed on the top of the stand, a sliding column is penetrated on the spring plate, and the sliding column extends to the side of the magnetic coil near the front line and is fixed with a magnetic block. The utility model has a simple structure, keeps the circuit in a connected state when the normal power supply is transmitting normally, and the magnetic coil has no influence on the circuit. When backflow occurs, the power supply can be disconnected in time, which has strong practicality and is suitable for promotion.

Description

Technical Field

[0001] The utility model belongs to the technical field of railway power supply, and in particular relates to a railway transformer power supply backfeed prevention device. Background Art

[0002] Railway substations are an important part of the railway power grid. They are the places where the power grid supplies power from high-voltage transmission lines or distribution transformers in the railway power grid to various user ends such as traction and power supply lines with low voltage levels. When the power grid needs to be shut down for maintenance, it is very easy to cause reverse power transmission in the power supply lines, which greatly threatens the life safety of line operators. Since reverse power transmission is the reverse power transmission of electrical appliances, even if the railway power supply is turned off, current will still be generated on the wires, which is inconvenient to prevent. Utility Model Content

[0003] The purpose of the utility model is to provide a railway substation power supply backflow prevention device, which has a simple structure, keeps the circuit in an on state when the normal power supply is transmitting normally, and the magnetic coil has no influence on the circuit. When backflow occurs, the power supply can be disconnected in time, the utility model has strong practicality and is suitable for promotion.

[0004] The utility model provides the following technical scheme: a railway substation power supply backfeeding prevention device, comprising a shell, the shell is installed at the power supply, the two sides of the shell are penetrated by the main line, the main line is located in the shell and is divided into a front line and a rear line, the front line and the rear line are provided with a terminal block, the two terminal blocks are fixed with terminal posts, the terminal post on the front line is fixed with a PN junction, a magnetic coil is fixed between the two terminal posts, an opening and closing seat is fixed on the rear line, the opening and closing seat is a hollow built-in cavity, the rear line is located in the built-in cavity in a disconnected state, and a power connection groove is fixed at the fracture, a vertical frame is fixed at the upper end of the opening and closing seat, a spring plate is fixed at the top of the vertical frame, a sliding column is penetrated on the spring plate, the sliding column extends to the side of the magnetic coil close to the front line and is fixed with a magnetic block, the other end of the sliding column is located on one side of the opening and closing seat and is fixed with an insulating block, a supporting spring is provided between the insulating block and the spring plate, and a power connection sheet is fixed at the lower end of the insulating block.

[0005] Preferably, the N-type semiconductor of the PN junction is close to the front line, and the P-type semiconductor is close to the magnetic coil.

[0006] Preferably, the power connection slot is a clamping slot, the shape of the power connection sheet matches the clamping slot, and the insulating block is located on the opening and closing seat and is closely connected thereto.

[0007] Preferably, the sliding column is an insulating column, and the direction in which the magnetic coil generates thrust on the magnetic block is toward the front line.

[0008] The utility model has the following beneficial effects: the structure is simple, the circuit is kept in the on state when the normal power supply is transmitting normally, and the magnetic coil has no influence on the circuit. When reverse power transmission occurs, the power supply can be disconnected in time, and the utility model has strong practicality, as follows:

[0009] (1) The utility model is provided with a PN junction. When the circuit is operating normally, the current is input from the front line. When passing through the terminal block thereon, the N-type semiconductor of the PN junction is close to the front line, so that the current cannot pass through. After passing through the electrical appliance, the current enters the rear line. Since the rear line is close to the power supply, the current will not pass through the magnetic coil. Therefore, the magnetic coil has no effect on the circuit. When the power is reversed, the current passes through the magnetic coil to lift the switch mechanism.

[0010] (2) The utility model is provided with a power connection plate. When the railway power supply is turned off and reverse current is supplied, the circuit enters the rear line. Since the power supply is disconnected and the P-type semiconductor is close to the magnetic coil, the PN structure forms a path. The current of the rear line can pass through the magnetic coil. The magnetic field generated by the magnetic coil pushes the magnetic block to make the sliding column connected to the magnetic block rise. The sliding column drives the insulating block to be lifted up and separated from the opening and closing seat. The power connection plate is pulled out from the power connection slot to disconnect the opening and closing seat to protect the power supply. When the power supply is turned on, if the reverse current is still supplied, the power supply and the circuit will not be connected. The power supply can still be protected. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0012] Figure 1 It is an overall schematic diagram of the utility model;

[0013] Figure 2 It is a cross-sectional view of the internal structure of the utility model;

[0014] The markings in the figure are: 1. Shell; 2. Main circuit; 3. Front circuit; 4. Rear circuit; 5. Terminal block; 6. PN junction; 7. Magnetic coil; 8. Magnetic block; 9. Opening and closing seat; 10. Stand; 11. Spring plate; 12. Sliding column; 13. Support spring; 14. Terminal; 15. Built-in cavity; 16. Insulating block; 17. Electrical connection plate; 18. Electrical connection groove. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0016] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", "top / bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0017] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0018] The structural features of the utility model are now described in detail with reference to the accompanying drawings of the specification.

[0019] See also Figure 1-2 A railway substation power supply backflow prevention device includes a shell 1, which is installed at the power supply. The shell 1 is penetrated by a main line 2 on both sides. The main line 2 is located in the shell 1 and is divided into a front line 3 and a rear line 4. The current is input from the front line 3. The front line 3 and the rear line 4 are provided with a terminal block 5. The two terminal blocks 5 are fixed with terminal posts 14. The terminal posts 14 on the front line 3 are fixed with a PN junction 6. The N-type semiconductor of the PN junction 6 is close to the front line 3, and the P-type semiconductor is close to the magnetic coil 7. When the circuit is normal, the current cannot pass through. The magnetic coil 7 is fixed between the two terminal posts 14.

[0020] See also Figure 2, an opening and closing seat 9 is fixedly provided on the rear circuit 4, and a hollow built-in cavity 15 is provided in the opening and closing seat 9. The rear circuit 4 is located in the built-in cavity 15 in a disconnected state, and a power connection slot 18 is fixedly provided at the break. A stand 10 is fixedly provided on the upper end of the opening and closing seat 9, and a spring plate 11 is fixedly provided on the top of the stand 10. A sliding column 12 is provided through the spring plate 11, and the sliding column 12 is an insulating column. The sliding column 12 extends to the side of the magnetic coil 7 close to the front circuit 3 and is fixed with a magnetic block 8. The direction in which the magnetic coil 7 generates a thrust on the magnetic block 8 is toward the front circuit 3, so that when the magnetic coil 7 is energized, the push The moving magnetic block 8 causes the sliding column 12 connected to the magnetic block 8 to rise. The other end of the sliding column 12 is located on one side of the opening and closing seat 9 and is fixed with an insulating block 16. The sliding column 12 drives the insulating block 16 to lift up. A supporting spring 13 is provided between the insulating block 16 and the spring plate 11. A power connection piece 17 is fixed at the lower end of the insulating block 16. The power connection groove 18 is a clamping groove. The shape of the power connection piece 17 matches the clamping groove. The insulating block 16 is located on the opening and closing seat 9 and is closely connected to it. The power connection piece 17 is pushed into the power connection groove 18 by the supporting spring 13 to connect the circuit in the opening and closing seat 9.

[0021] The utility model provides a railway substation power supply backflow prevention device with a simple structure, keeps the circuit in an on state when the normal power supply is transmitting normally, and the magnetic coil has no influence on the circuit. When backflow occurs, the power supply can be disconnected in time, the utility model has strong practicability and is suitable for promotion.

[0022] When using it specifically, refer to Figure 1-2 When the circuit is operating normally, the current is input from the front line 3. When passing through the terminal block 5 thereon, the N-type semiconductor of the PN junction 6 is close to the front line 3, so that the current cannot pass through. After the current passes through the electrical appliance, it enters the rear line 4. Since the rear line 4 is close to the power supply, the current will not pass through the magnetic coil 7. Therefore, the magnetic coil 7 has no effect on the circuit. When the railway power is turned off and reverse power is transmitted, the circuit enters the rear line 4. Since the power supply is disconnected and the P-type semiconductor is close to the magnetic coil 7, the PN junction 6 constitutes a path, and the current of the rear line 4 can pass through the magnetic coil 7. The magnetic field generated by the magnetic coil 7 pushes the magnetic block 8, so that the sliding column 12 connected to the magnetic block 8 rises, and the sliding column 12 drives the insulating block 16 to be lifted up, so that it is separated from the opening and closing seat 9, and the power connection piece 17 is pulled out from the power connection slot 18, and the opening and closing seat 9 is disconnected to protect the power supply. When the power is turned on, if the reverse power transmission phenomenon still exists, the power supply and the circuit will not be connected, and the power supply is still in a disconnected state.

[0023] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. 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 railway power supply backflow prevention device, comprising a housing (1), characterized in that: The housing (1) is installed at the power supply, and the housing (1) is penetrated by the main circuit (2) on both sides. The main circuit (2) is located in the housing (1) and is divided into a front circuit (3) and a rear circuit (4). The front circuit (3) and the rear circuit (4) are provided with a wiring seat (5), and the two wiring seats (5) are fixed with a terminal (14). The terminal (14) on the front circuit (3) is fixed with a PN junction (6), and a magnetic coil (7) is fixed between the two terminal posts (14). The rear circuit (4) is fixed with an opening and closing seat (9), and the opening and closing seat (9) has a hollow built-in cavity (15). The rear circuit (4) is located in the built-in cavity. (15) is in a disconnected state, and a power connection slot (18) is fixedly provided at the break. A stand (10) is fixedly provided at the upper end of the opening and closing seat (9), a spring plate (11) is fixedly provided at the top of the stand (10), a sliding column (12) is passed through the spring plate (11), the sliding column (12) extends to the side of the magnetic coil (7) close to the front line (3) and is fixedly provided with a magnetic block (8), the other end of the sliding column (12) is located on one side of the opening and closing seat (9) and is fixedly provided with an insulating block (16), a supporting spring (13) is provided between the insulating block (16) and the spring plate (11), and a power connection sheet (17) is fixedly provided at the lower end of the insulating block (16).

2. A railway power supply backflow prevention device according to claim 1, characterized in that: The N-type semiconductor of the PN junction (6) is close to the front line (3), and the P-type semiconductor is close to the magnetic coil (7).

3. The railway substation power supply backflow prevention device according to claim 1, characterized in that: The power connection slot (18) is a clamping slot, the shape of the power connection sheet (17) matches the clamping slot, and the insulating block (16) is located on the opening and closing seat (9) and is closely connected thereto.

4. The railway power supply backflow prevention device according to claim 1, characterized in that: The sliding column (12) is an insulating column, and the direction in which the magnetic coil (7) generates a thrust on the magnetic block (8) is toward the front line (3).

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