Lightning protection system for non-electrified line trackside signal equipment

Abstract

The invention discloses a lightning protection system for trackside signal equipment of a non-electrified line. The lightning protection system is characterized in that signal cables connected with the trackside signal equipment are shielding cables; the through ground wire is arranged on a non-electrified circuit where the trackside signal equipment is located and is connected with an equipment ground net, and the shielding layer of each shielding cable is electrically connected with the through ground wire; the insulated lightning receiving needle is arranged at the top end of the high-column annunciator concrete pole and is positioned above the high-column annunciator; the sheath-equipped flame-retardant downlead of the insulated lightning arresting needle is sequentially connected with the lightning information recorder and the vertical grounding body, and is electrically connected with the through ground wire through the vertical grounding body. The transient potential difference suppression devices are arranged between the two tracks at intervals, and each transient potential difference suppression device is electrically connected with the two tracks; the shunting device is connected to a shielding cable of the sending-end trackside signal equipment; and the equipment box of each trackside signal equipment is a shielding equipment box. The system can effectively prevent lightning from damaging trackside signal equipment of a non-electrified railway line, and has a good protection effect.

Description

Technical Field

[0001] The invention relates to the technical field of lightning protection for railway trackside signal equipment, and in particular to a lightning protection system for trackside signal equipment on a non-electrified line. Background Art

[0002] On non-electrified railway lines, trackside signal equipment lacks direct lightning protection from overhead lines. It is located in the LPZ0A area of ​​the lightning protection zone and may be struck by direct lightning. It also receives all the lightning electromagnetic pulse energy from nearby ground lightning. The lightning electromagnetic environment is relatively harsh. Non-electrified lines do not have through ground wires, and most trackside equipment has poor grounding conditions. The lightning overvoltage coupled on the cable armor, equipment casing and core wire is not dispersed effectively. Even if independent grounding bodies are installed at some equipment, due to the limited construction space near the line, the high soil resistivity, and the presence of sand and gravel in most soils, the power frequency grounding resistance of independent grounding bodies is mostly high. Even when tested after rain, the grounding resistance value is mostly greater than 10Ω, which is not conducive to lightning current discharge and the equipment is easily harmed by lightning.

[0003] In addition, the high-post signal machine beside the track is relatively high and has no lightning protection device, which makes it easy to be struck by lightning. After the high-post signal machine is protected by lightning, it will cause damage to the high-post signal machine's bulb, lighting unit, and nearby signal equipment or related signal equipment.

[0004] In addition, the lightning protection configuration of existing trackside equipment takes into account the actual lightning overvoltage level that may be encountered, without comprehensive consideration of the overvoltage level, insulation tolerance, lightning environment of the location, etc. Some equipment ports do not even have surge protectors on the external lines. When the equipment is invaded by lightning overvoltage and overcurrent, lightning damage failures are prone to occur.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a lightning protection system for trackside signal equipment on non-electrified lines, which can effectively prevent lightning from damaging trackside signal equipment on non-electrified railway lines, play a good protective role, and thus solve the above-mentioned technical problems existing in the prior art.

[0007] The objective of the present invention is achieved through the following technical solutions:

[0008] A lightning protection system for trackside signal equipment on non-electrified lines, comprising:

[0009] Shielded cables, through-ground wires, insulated lightning rods, at least three transient potential difference suppression devices, shunt devices, surge protectors, shielded equipment boxes and lightning information recorders; among them,

[0010] The through ground wire is arranged on the non-electrified line where the trackside signal equipment is located, parallel to the track, and electrically connected to the equipment ground network. Each trackside metal box, signal equipment housing, track transformer shielding ground terminal, surge protector ground terminal, mechanism ground terminal, and shielded cable metal sheath and shielding layer are electrically connected to the through ground wire through a conductor;

[0011] The insulating lightning rod is arranged at the top end of the cement pole of the high-column signal machine of the non-electrified line, and is located above the high-column signal machine arranged on the cement pole of the high-column signal machine;

[0012] The flame-retardant down conductor with a sheath at the lower end of the insulating lightning rod is connected to a lightning information recorder and a vertical grounding body in sequence, and the vertical grounding body is electrically connected to the through ground wire;

[0013] The light bulb on the high column signal on the cement pole of the high column signal and the lighting unit are connected by a shielded cable;

[0014] Each transient potential difference suppression device is arranged at intervals between two tracks of the non-electrified line, and both ends of each transient potential difference suppression device are electrically connected to the two tracks;

[0015] The shunt device is connected to both ends of the circuit breaker at the sending end of the trackside equipment of the track circuit;

[0016] The equipment boxes of all trackside signal equipment are shielded equipment boxes.

[0017] Compared with the prior art, the lightning protection system for trackside signal equipment on non-electrified lines provided by the present invention has the following beneficial effects:

[0018] By setting up insulated lightning rods to intercept lightning, the problem of back-strike caused by lightning current after lightning is blocked can be reduced; by setting up a through ground wire in the station, a good grounding reference is provided for the trackside equipment, and the equipotential between different equipment is achieved, reducing the potential rise caused by lightning entering the ground; by setting up a shunt device, the problem of abnormal tripping of the circuit breaker due to lightning impulse is reduced; by setting up a transient potential difference suppression device between the tracks, the potential difference between the two rails is reduced, reducing the harm to the equipment caused by the differential mode overvoltage transferred by the rails; using shielded grounding measures, the harm caused by lightning electromagnetic pulses through spatial coupling and conduction along the line is reduced; using a lightning information recorder to record information such as the time, number, peak polarity, etc. of lightning occurrence, providing data support for operation and maintenance and fault investigation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of a lightning protection system for trackside signal equipment on a non-electrified line provided in an embodiment of the present invention.

[0021] Figure 2 A structural block diagram of a lightning protection system for trackside signal equipment on non-electrified lines provided in an embodiment of the present invention.

[0022] Figure 3 A schematic diagram of the structure of an insulating lightning rod of a lightning protection system for trackside signal equipment on a non-electrified line provided in an embodiment of the present invention.

[0023] Figure 4 A schematic diagram of the installation of a transient potential difference suppression device for a lightning protection system for trackside signal equipment on a non-electrified line provided in an embodiment of the present invention.

[0024] Figure 5 A schematic diagram of the structure of a shunt device of a lightning protection system for trackside signal equipment on a non-electrified line provided in an embodiment of the present invention.

[0025] The marks in the figure are: 1-insulated lightning rod; 2-lightning information recorder; 3-through ground wire; 4-vertical grounding body; 5-shunt device; 6-transient potential difference suppression device; 7-track connecting wire for suppressing lightning current; 71-soft magnetic body; 8-shielded cable of trackside signal equipment at the sending end; 9-shielded cable of trackside signal equipment of high-column signal machine; 10-shielded cable of trackside signal equipment at the receiving end; 11-shielded ladder line of trackside signal equipment of high-column signal machine; 12-circuit breaker; 100-cement pole of high-column signal machine; 200-high-column signal machine; 300-sending end trackside signal equipment; 400-receiving end trackside signal equipment; 500-trackside signal equipment of high-column signal machine; 600-signal equipment; 700-equipment ground network; A-shielded wire; B-lightning current; C-track side; D-signal building side. DETAILED DESCRIPTION

[0026] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in combination with the specific content of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments, which does not constitute a limitation of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0027] First, the terms that may be used in this article are explained as follows:

[0028] The term “and / or” means that either or both of them can be realized at the same time. For example, X and / or Y means both “X” or “Y” and “X and Y”.

[0029] The terms "include", "comprises", "contains", "has" or other descriptions with similar semantics should be interpreted as non-exclusive inclusion. For example, including certain technical feature elements (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, procedures, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products or products, etc.) should be interpreted as including not only certain technical feature elements explicitly listed, but also other technical feature elements known in the art that are not explicitly listed.

[0030] The term "consisting of..." means excluding any technical feature elements not explicitly listed. If this term is used in a claim, it will make the claim closed, so that it does not contain technical feature elements other than the technical feature elements explicitly listed, except for the conventional impurities related to them. If this term only appears in a clause of a claim, it only limits the elements explicitly listed in the clause, and the elements recorded in other clauses are not excluded from the overall claim.

[0031] Unless otherwise specified or limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example: it 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 an indirect connection 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 this article can be understood according to specific circumstances.

[0032] The orientation or position relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the drawings and are only for the convenience and simplification of description, and do not explicitly or implicitly indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation of this document.

[0033] The scheme provided by the present invention is described in detail below. The contents not described in detail in the embodiments of the present invention belong to the prior art known to professionals in the field. If the specific conditions are not specified in the embodiments of the present invention, they are carried out according to the conventional conditions in the field or the conditions recommended by the manufacturer. If the manufacturers are not specified in the reagents or instruments used in the embodiments of the present invention, they are all conventional products that can be purchased commercially.

[0034] like Figure 1 , Figure 2As shown, an embodiment of the present invention provides a lightning protection system for trackside signal equipment of a non-electrified line, comprising:

[0035] Shielded cables, through-ground wires, insulated lightning rods, at least three transient potential difference suppression devices, shunt devices, surge protectors, shielded equipment boxes and lightning information recorders; among them,

[0036] The through ground wire is arranged on the non-electrified line where the trackside signal equipment is located, parallel to the track, and electrically connected to the equipment ground network. Each trackside metal box, signal equipment housing, track transformer shielding ground terminal, surge protector ground terminal, mechanism ground terminal, and shielded cable metal sheath and shielding layer are electrically connected to the through ground wire through a conductor;

[0037] The insulating lightning rod is arranged at the top end of the cement pole of the high-column signal machine of the non-electrified line, and is located above the high-column signal machine arranged on the cement pole of the high-column signal machine;

[0038] The flame-retardant down conductor with a sheath at the lower end of the insulating lightning rod is connected to a lightning information recorder and a vertical grounding body in sequence, and the vertical grounding body is electrically connected to the through ground wire;

[0039] The light bulb on the high column signal on the cement pole of the high column signal and the lighting unit are connected by a shielded cable;

[0040] Each transient potential difference suppression device is arranged at intervals between two tracks of the non-electrified line, and both ends of each transient potential difference suppression device are electrically connected to the two tracks;

[0041] The shunt device is connected to both ends of the circuit breaker at the sending end of the trackside equipment of the track circuit;

[0042] The equipment boxes of all trackside signal equipment are shielded equipment boxes.

[0043] like Figure 3 As shown, preferably, in the above system, the insulating lightning rod comprises: a stainless steel needle, a glass fiber reinforced plastic insulating tube and a sheathed flame retardant down conductor; wherein,

[0044] The stainless steel needle is arranged at the top end of the glass fiber reinforced plastic insulation tube, and the stainless steel needle is at the top end of the cement pole of the high column signal machine;

[0045] The bottom end of the stainless steel needle is electrically connected to the flame-retardant down conductor with a sheath, and the flame-retardant down conductor with a sheath passes through the glass fiber reinforced plastic insulation tube and is led out from the lower end of the glass fiber reinforced plastic insulation tube.

[0046] Preferably, in the above system, the distance between the vertical grounding body position and the grounding point of the signal equipment is not less than 15 meters.

[0047] Preferably, in the above system, the trackside signal equipment is connected to the two tracks using track connecting lines that suppress lightning current.

[0048] Preferably, in the above system, the track connecting line for suppressing lightning current is:

[0049] Any one of a track connecting line provided with a differential mode surge protector, a track connecting line provided with a common mode surge protector, a track connecting line provided with an all-mode surge protector, and a track connecting line with a soft magnetic body passing through the core.

[0050] like Figure 4 As shown, preferably, in the above system, the distance between the transient potential difference suppression device and the nearest trackside signal equipment is 5 meters.

[0051] Preferably, in the above system, the shielding equipment box is a metal equipment box or a non-metal equipment box with a shielding net.

[0052] like Figure 5 As shown, preferably, in the above system, the shunt device is connected in parallel to the circuit breaker of the signal cable connected to the trackside signal equipment of the non-electrified line.

[0053] In summary, it can be seen that the lightning protection system for trackside signal equipment of non-electrified lines in the implementation mode of the present invention intercepts lightning by setting an insulating lightning rod, thereby reducing the back-strike problem caused by lightning current after lightning connection; provides a grounding reference for trackside equipment by setting a through ground wire in the station, and realizes the equipotential between different equipment; reduces the lightning impulse tripping problem of the circuit breaker by setting a shunt device; reduces the potential difference between the two rails by setting a transient potential difference suppression device between the tracks, and reduces the harm of the differential mode overvoltage transferred by the rails to the equipment; uses shielded grounding measures to reduce the harm caused by lightning electromagnetic pulses through spatial coupling and conduction along the line; uses a lightning information recorder to record information such as the time, number, peak polarity, etc. of lightning occurrence, to provide data support for operation and maintenance and fault investigation.

[0054] In order to more clearly demonstrate the technical solution and technical effects provided by the present invention, the solution provided by the embodiment of the present invention is described in detail with specific embodiments below.

[0055] Example 1

[0056] The embodiment of the present invention provides a lightning protection system for trackside signal equipment on non-electrified lines, which mainly includes measures such as interception of direct lightning strikes, good grounding, suppression of differential mode overvoltage between rails, setting of shunt devices, suppression of lightning current intrusion along the line, shielding, and visualization of lightning information, see Figure 2The various measures are interrelated, and the suppression of lightning current is complementary to each other. Through the action of each part, a holistic and systematic protection is achieved. Figure 1 shown.

[0057] In the above system, the structure of the insulating lightning rod as a direct lightning interception device is as follows: Figure 3 The lightning-termination part of the insulated lightning-termination rod is a stainless steel needle, the fixed pipe part is a glass fiber reinforced plastic pipe, and the sheathed flame-retardant down conductor part is a 50mm 2 Flame retardant insulated multi-strand copper, and laid through 3mm thick PVC pipe (such as Figure 3 As shown in the figure, the insulation breakdown and discharge problems caused by lightning current discharge can be reduced. Insulated lightning rods can be installed on the poles of high-pillar signal machines, on structures along the line, or independently to reduce the damage caused by direct lightning strikes to trackside signal equipment. The grounding point of the flame-retardant down conductor with sheath of the insulated lightning rod can be more than 15m away from the grounding point of the signal equipment. Figure 1 , which can reduce the ground rebound caused by lightning current entering the ground.

[0058] 35mm is used in the station 2 Multi-strand copper wires are used as through-ground wires to connect the signal building ground network, equipment grounding decentralized ground network, independent grounding bodies, etc. into one, providing stable and good grounding for signal equipment while achieving equipotential between different signal equipment, such as Figure 1 shown.

[0059] The rail differential mode overvoltage suppression measure is to take each track section as the minimum protection unit, and set up rail transient potential difference suppression devices at multiple points in the section (such as Figure 4 As shown in the figure, it can reduce the transient potential difference between the two rails, so that it can form an equipotential area for the rails. It also serves as the first-level differential mode protection device for the track circuit trackside equipment, and uses the equivalent inductance of the soft magnetic body under the impact state and the lightning protection equipment SPD1 in the box to form a multi-level protection to reduce the lightning current that invades the track circuit trackside equipment. The number of transient potential difference suppression devices between rails is configured according to the grounding resistance of the rail to the ground and the unbalanced ground resistance between the rails. The number of configurations should be increased in sections with larger grounding resistance of the rails and larger difference in ground resistance between the rails. At least 3 devices are configured in each section, and the distance from the insulating node to the track circuit equipment connection line should be no less than 5m, leaving enough distance to cooperate with the surge protector in the track box.

[0060] By setting up a shunt device, the lightning current passing through the circuit breaker is reduced, thereby reducing the number of abnormal tripping of the circuit breaker. The shunt device is normally in a high-impedance state (i.e., an open circuit state), which does not affect the normal operation of the equipment and the power frequency tripping characteristics of the circuit breaker. When the lightning current I1 invades, the shunt device changes from a high-impedance state to a low-impedance path (i.e., a low-impedance state), shunting most of the lightning current I3 and allowing a small part of the lightning current I2 to pass through the circuit breaker. The circuit breaker can withstand the impact of the lightning current I2, reducing the probability of abnormal tripping of the circuit breaker due to lightning strikes, such as Figure 5 shown.

[0061] Taking the SA-B-1A type circuit breaker, which is commonly used in trackside equipment on site, as an example, the 1A hydraulic circuit breaker was subjected to a lightning impulse withstand test in the laboratory and the test results were recorded. The impulse test found that the lightning withstand capability of the 1A hydraulic circuit breaker was relatively weak. After applying an impulse with a waveform of 8 / 20us and a current amplitude of 2.16kA (applied voltage amplitude of 1.8kV), the circuit breaker tripped.

[0062] Table 1 shows the test results of SA-B-1A circuit breaker

[0063]

[0064] according to Figure 5 After connecting the shunt device at both ends of the circuit breaker, the impact test was carried out in the laboratory, and the lightning resistance of the same circuit breaker was greatly improved. After the circuit breaker passed the impact with a waveform of 8 / 20us and an amplitude of about 23kA (applied voltage of 20kV), the circuit breaker was still in the normal closing state, which greatly improved the lightning resistance of the circuit breaker.

[0065] Table 2 shows the test results of SA-B-1A circuit breaker with shunt device

[0066]

[0067] Equipment to suppress lightning current intrusion along the line includes soft magnetic wires and surge protectors, such as Figure 1 As shown. After the soft magnetic material is installed through the conductor, it does not affect the normal operation of the equipment. When a lightning current passes through the line, the equivalent inductance of the soft magnetic material changes the parameters of the line under the impact state, which plays a role in suppressing the intrusion of lightning current along the line. The surge protector uses the nonlinear characteristics of its own voltage response. Under normal circumstances, it is in a high-resistance state. When the lightning current passes through, it is in a low-resistance state, discharging the lightning current to the ground or other circuits, and also achieving the effect of transient equipotential, reducing the damage to the equipment caused by the intrusion of lightning current along the line. Differential mode, common mode or full-mode surge protectors can be set on site according to the type of cable.

[0068] The shielding measures are mainly to reduce the overvoltage coupled by lightning current on the equipment through capacitance, resistance and inductance. Through shielding and grounding measures, the lightning current coupled on the cable and equipment is discharged to the ground to reduce the probability of lightning damage. The main measures of this solution include grounding the metal outer sheath and shielding layer of the cable; using shielded cables on the ladder line of the high-post signal machine, and grounding the metal outer sheath and shielding layer; using metal boxes or non-metal boxes to add shielding nets for equipment boxes. Shielding and grounding connections are as follows: Figure 2 shown.

[0069] Lightning information visualization is to install a lightning information recorder on the down conductor of the lightning rod, which can record the time, number, peak polarity and other information of lightning. It can be displayed locally or uploaded to the monitoring terminal by local display + 4G mobile network, so that users can query the lightning event information. Figure 2 shown.

[0070] In summary, in the system of the embodiment of the present invention, an insulated lightning rod is used to intercept lightning, reducing the problem of counter-strike caused by lightning current after lightning connection. The through ground wire in the station is used to provide a grounding reference for the trackside equipment and achieve equipotential between different equipment. The shunt device is used to reduce the problem of lightning impulse tripping of the circuit breaker. A transient potential difference suppression device between rails is set to reduce the potential difference between the two rails and reduce the harm to the equipment caused by the differential mode overvoltage transferred by the rails. Soft magnets and surge protectors are used to suppress the harm of intrusive lightning currents along the line. Shielded grounding measures are used to reduce the harm caused by lightning electromagnetic pulses through spatial coupling and conduction along the line. A lightning information recorder is used to record information such as the time, number, peak polarity, etc. of lightning occurrence, providing data support for operation and maintenance and fault investigation.

[0071] The present invention analyzes the damage modes and invasion paths of lightning to trackside equipment of non-electrified lines, and proposes systematic measures to solve the problem of lightning damage. The lightning protection system for trackside signal equipment constructed by technical means such as lightning connection, current diversion, setting equipotential zones, through grounding and surge suppression meets the installation requirements of railway trackside equipment and has strong engineering feasibility.

[0072] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. The information disclosed in the background technology section of this article is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or in any form that the information constitutes prior art known to those skilled in the art.

Claims

1. A lightning protection system for trackside signal equipment on non-electrified lines, characterized in that: include: Shielded cables, through-ground wires, insulated lightning rods, at least three transient potential difference suppression devices, shunt devices, surge protectors, shielded equipment boxes and lightning information recorders; among them, The signal cables connected to each trackside signal equipment on non-electrified lines are all shielded cables; The through ground wire is arranged on the non-electrified line where the trackside signal equipment is located, parallel to the track, and electrically connected to the equipment ground network. Each trackside metal box, signal equipment housing, track transformer shielding ground terminal, surge protector ground terminal, mechanism ground terminal, and shielded cable metal sheath and shielding layer are electrically connected to the through ground wire through a conductor; The insulating lightning rod is arranged at the top end of the cement pole of the high-column signal machine of the non-electrified line, and is located above the high-column signal machine arranged on the cement pole of the high-column signal machine; The flame-retardant down conductor with a sheath at the lower end of the insulating lightning rod is connected to a lightning information recorder and a vertical grounding body in sequence, and the vertical grounding body is electrically connected to the through ground wire; The light bulb on the high column signal and the lighting unit on the high column signal column are connected by a shielded cable; Each transient potential difference suppression device is arranged at intervals between two tracks of the non-electrified line, and both ends of each transient potential difference suppression device are electrically connected to the two tracks; The shunt device is connected to both ends of the circuit breaker at the sending end of the trackside equipment of the track circuit; The equipment boxes of all trackside signal equipment are shielded equipment boxes.

2. The lightning protection system for trackside signal equipment of non-electrified lines according to claim 1 is characterized in that: The insulating lightning rod comprises: Stainless steel needle, FRP insulating tube and sheathed flame retardant down conductor; among them, The stainless steel needle is arranged at the top end of the glass fiber reinforced plastic insulation tube, and the stainless steel needle is at the top end of the cement pole of the high column signal machine; The bottom end of the stainless steel needle is electrically connected to the flame-retardant down conductor with a sheath, and the flame-retardant down conductor with a sheath passes through the glass fiber reinforced plastic insulation tube and is led out from the lower end of the glass fiber reinforced plastic insulation tube.

3. The lightning protection system for trackside signal equipment of non-electrified lines according to claim 2 is characterized in that: The sheathed flame retardant down conductor adopts 50mm 2 Flame retardant insulated stranded copper wires are passed through a 3mm thick PVC tube.

4. The lightning protection system for trackside signal equipment of non-electrified lines according to any one of claims 1 to 3, characterized in that: The distance between the vertical grounding body and the grounding point of the signal equipment is not less than 15 meters.

5. The lightning protection system for trackside signal equipment of non-electrified lines according to any one of claims 1 to 3, characterized in that: The trackside signal equipment is connected to the two tracks by track connecting wires which suppress lightning current.

6. The lightning protection system for trackside signal equipment of non-electrified lines according to claim 5, characterized in that: The track connection line for suppressing lightning current is: Any one of a track connecting line provided with a differential mode surge protector, a track connecting line provided with a common mode surge protector, a track connecting line provided with an all-mode surge protector, and a track connecting line with a soft magnetic body passing through the core.

7. The lightning protection system for trackside signal equipment of non-electrified lines according to any one of claims 1 to 3, characterized in that: The distance between the transient potential difference suppression device and the nearest trackside signal equipment is 5 meters.

8. The lightning protection system for trackside signal equipment of non-electrified lines according to any one of claims 1 to 3, characterized in that: The shielding equipment box is a metal equipment box or a non-metal equipment box with a shielding net.

9. The lightning protection system for trackside signal equipment of non-electrified lines according to any one of claims 1 to 3, characterized in that: The current shunting device is connected in parallel to the circuit breaker of the signal cable connected to the trackside signal equipment of the non-electrified line.

10. The lightning protection system for trackside signal equipment of non-electrified lines according to any one of claims 1 to 3, characterized in that: The through ground wire adopts 35mm 2 Stranded copper conductor.

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