Lightning protection type compensation capacitor for railway

Abstract

The utility model discloses a lightning protection type compensation capacitor for a railway in the technical field of railway signals, which comprises a capacitor core and a cable, one side of a PCB (printed circuit board) is fixedly connected with four lead-out wire welding points, the four lead-out wire welding points are uniformly distributed on the surface of one side of the PCB, and the lead-out wire welding points are welded on the surface of the other side of the PCB. One end of the cable outgoing line is welded to one side of the outgoing line welding point, a fuse is welded to the surface of one side of the PCB, one end of the fuse is welded to one side of the outgoing line welding point, and the fuse of the specified specification is connected in series to one pole through the lightning protection short circuit type compensation capacitor core. When a large current exceeding the limit of the fuse passes through, the fuse is fused in an extremely short circuit to form an open circuit, so that an abnormal red light band phenomenon caused by short circuit is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of railway signals, and in particular relates to a lightning protection type compensation capacitor for railways. Background Art

[0002] In the ZPW.2000A non-insulated frequency-shift track circuit in the railway signal system, the rails are used as the transmission channel for information, and the transmission frequency is relatively high, which is a signal in the frequency range of 1700Hz to 2600Hz. When this signal is used on a line with domestic 60kg / m rails and a 1435mm track gauge, each meter of the line presents an inductance of about 1.4mH and a capacitance of only a few pico-farads. The rails are equivalent to an inductive load, showing a high inductive reactance, which causes the signal to decay quickly during transmission, affecting the transmission length of the track circuit. In order to make up for the lack of capacitance, offset the inductance of the rails, and make the track impedance as resistive as possible to ensure the transmission distance of the track circuit and the reliable operation of the locomotive signal system, the current method is to install capacitors in sections on the track circuit, which are called compensation capacitors based on their compensation function.

[0003] In the existing capacitor production technology, the cable is divided into 7 strands, which are directly welded to the gold-sprayed end face using tin soldering, and then both sides are filled with epoxy resin for sealing. The track compensation capacitor is in an open-air environment, especially in non-electrified sections, and is frequently subjected to voltage transients, surges and lightning impacts, but there are no good protective measures. High-voltage lightning breaks through the capacitor, causing the capacitor to short-circuit and display an abnormal red light band. This fault seriously affects the driving efficiency. For this reason, we propose a lightning protection compensation capacitor for railways. Utility Model Content

[0004] The utility model aims to provide a lightning protection compensating capacitor for railways, so as to solve the problem that the compensating capacitor is prone to short circuit after lightning strikes in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a lightning protection compensation capacitor for railways, comprising a capacitor core and a cable, wherein one end of the cable is provided with a cable lead, one end of the capacitor core is provided with a PCB board, one side of the PCB board is provided with a lead wire welding point, a surface of the PCB board is provided with a via hole, one side of the via hole is provided with a metal spray gold layer, one side of the PCB board is provided with a fuse, and both sides of the PCB board are provided with a copper clad layer.

[0006] Preferably, a cable lead-out wire is led out from one end of the cable, and the cable lead-out wire is provided with four strands.

[0007] Preferably, one side of the PCB board is fixedly connected with a lead wire welding point, and four lead wire welding points are provided and evenly distributed on one side surface of the PCB board, and one end of the cable lead wire is respectively welded to one side of the lead wire welding point.

[0008] Preferably, the surface of the PCB board is fixedly provided with vias, and four vias are provided and evenly distributed on the surface of the PCB board. The capacitor core is connected to the PCB board by welding between the inside of the vias and the metal spray gold layer.

[0009] Preferably, a fuse is welded on one side surface of the PCB board, one end of the fuse is welded to one side of the lead wire welding point, the other end of the fuse is welded to the via hole, and copper cladding layers are laid and connected on both side surfaces of the PCB board.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] A fuse of specified specifications is connected in series at one pole of the lightning protection short-circuit compensation capacitor core. When a large current exceeding the fuse limit passes through, the fuse will melt in a very short time to form an open circuit, avoiding the abnormal red light band phenomenon caused by the short circuit. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0013] Figure 2 It is a schematic diagram of the connection structure between the capacitor core and the PCB board of the utility model.

[0014] In the figure: 1. Capacitor core; 2. Cable; 3. Cable lead; 4. PCB board; 5. Lead wire welding point; 6. Via hole; 7. Metal spray gold layer; 8. Fuse; 9. Copper cladding layer. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] See also Figure 1-2The utility model provides a technical solution: a lightning protection compensation capacitor for railways, comprising a capacitor core 1 and a cable line 2, a cable lead 3 is provided at one end of the cable line 2, a PCB board 4 is provided at one end of the capacitor core 1, a lead wire welding point 5 is provided on one side of the PCB board 4, a via hole 6 is provided on the surface of the PCB board 4, a metal spraying layer 7 is provided on one side of the via hole 6, a fuse 8 is provided on one side of the PCB board 4, and copper cladding layers 9 are provided on both sides of the PCB board 4.

[0017] Specifically, a cable lead 3 is led out from one end of the cable line 2, and the cable lead 3 is provided with four strands. A lead wire welding point 5 is fixedly connected to one side of the PCB board 4. There are four lead wire welding points 5, which are evenly distributed on the surface of one side of the PCB board 4. One end of the cable lead wire 3 is respectively welded to one side of the lead wire welding point 5. A via 6 is fixedly provided on the surface of the PCB board 4. There are four vias 6, which are evenly distributed on the surface of the PCB board 4. The capacitor core 1 is connected to the PCB board 4 by welding between the inside of the via 6 and the metal spray gold layer 7. A fuse 8 is welded to the surface of one side of the PCB board 4. One end of the fuse 8 is welded to one side of the lead wire welding point 5, and the other end of the fuse 8 is welded to the via 6. Copper cladding layers 9 are laid and connected on both sides of the PCB board 4.

[0018] In this embodiment, a double-sided PCB board 4 is welded to one end of the lightning protection short-circuit compensation capacitor core 1, the cable lead wire 3 at one end of the cable line 2 is evenly divided into four strands and then welded to the PCB board 4, and finally a fuse 8 of specific specifications is welded to the PCB board 4.

[0019] The specific implementation details are as follows: both sides of the double-sided PCB board 4 are provided with a copper coating layer 9, and the lightning protection short-circuit compensation capacitor core 1 first welds the PCB board 4 to the metal sprayed gold layer 7 at the position of the via hole 6 and fixes it on the sprayed gold end face. Then the cable lead wire 3 is evenly divided into four strands and welded to the lead wire welding point 5 reserved on the PCB board 4, and finally a fuse 8 of a specific specification is connected to the lead wire welding point 5 and the via hole 6, so that the two sides of the PCB board 4 are connected through the series fuse 8.

[0020] When a lightning strike or a large current passes through, the fuse 8 will quickly melt and cut off the circuit, thus avoiding the abnormal red light band phenomenon caused by short-circuiting the rails.

[0021] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lightning protection compensating capacitor for railways, comprising a capacitor core (1) and a cable (2), characterized in that: One end of the cable (2) is provided with a cable lead (3), one end of the capacitor core (1) is provided with a PCB board (4), one side of the PCB board (4) is provided with a lead wire welding point (5), a surface of the PCB board (4) is provided with a via hole (6), one side of the via hole (6) is provided with a metal spraying layer (7), one side of the PCB board (4) is provided with a fuse (8), and both sides of the PCB board (4) are provided with a copper cladding layer (9).

2. A lightning protection compensating capacitor for railway use according to claim 1, characterized in that: A cable lead-out line (3) is led out from one end of the cable line (2), and the cable lead-out line (3) is provided with four strands.

3. The lightning protection compensation capacitor for railway according to claim 1, characterized in that: One side of the PCB board (4) is fixedly connected with a lead wire welding point (5), and four lead wire welding points (5) are provided and evenly distributed on the surface of one side of the PCB board (4), and one end of the cable lead wire (3) is respectively welded to one side of the lead wire welding point (5).

4. The lightning protection compensation capacitor for railway according to claim 1, characterized in that: The surface of the PCB board (4) is fixedly provided with vias (6), and four vias (6) are provided and evenly distributed on the surface of the PCB board (4). The capacitor core (1) and the PCB board (4) are connected by welding between the inside of the vias (6) and the metal spray gold layer (7).

5. The lightning protection compensation capacitor for railway according to claim 1, characterized in that: A fuse (8) is welded on one side surface of the PCB board (4), one end of the fuse (8) is welded to one side of a lead wire welding point (5), the other end of the fuse (8) is welded to a via (6), and copper cladding layers (9) are laid and connected on both side surfaces of the PCB board (4).

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