Split type track circuit compensation capacitor and track circuit

Abstract

The utility model belongs to the technical field of track circuits, and particularly relates to a split type track circuit compensation capacitor and a track circuit, the compensation capacitor comprises a compensation capacitor body and a lead wire; the compensation capacitor body is detachably connected with the lead wire; the two sides of the compensation capacitor body are respectively provided with one lead wire. According to the utility model, the split-type structural design is adopted, so that the compensation capacitor body or the lead wire can be independently replaced when the fault occurs, the on-site maintenance workload can be reduced, the fault processing time is shortened, and the equipment replacement cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of track circuit, concretely relates to a split type track circuit compensation capacitor and track circuit. BACKGROUND

[0002] The statements in this section merely provide background information related to the utility model and do not necessarily constitute prior art.

[0003] The compensation capacitor for railway signal (i.e. track circuit compensation capacitor) is used for compensating the steel rail inductance, improving the "signal to noise ratio" and transmission length of the track circuit, realizing the inspection of the steel rail breakage and improving the short-circuit current of the locomotive signal at the entrance end of the track circuit. The working principle of the compensation capacitor is to regard each compensation section steel rail L and the capacitor C as "series resonance", as shown in the figure. In this way, a resistance load R is obtained at the entrance end (A, A') of the compensation section, and a higher output level is obtained at the exit end (C, C'). When the ballast resistance changes from the minimum to infinity, the characteristic impedance value of the track circuit changes little, and the output level is stable. When the compensation capacitor fails, the receiving voltage of the track circuit receiver will decrease, and when multiple compensation capacitors in the same section fail simultaneously, the track relay corresponding to the section may drop, causing a "red light band" failure and affecting the transportation efficiency. Figure 1

[0004] The existing compensation capacitor for railway signal (i.e. track circuit compensation capacitor) is of one-piece type, and its structural diagram is shown in Figure 2 . The capacitor core in the compensation capacitor body and the lead wire are connected in one piece by welding, and then connected to the steel rail through the plug head at the end of the lead wire.

[0005] When the compensation capacitor is used in the field, the failure rate gradually increases with the increase of service time, and the common failure phenomena include two categories: electrical parameter change and appearance change, such as decrease of capacitance value, increase of loss angle tangent tanσ, cracking of shell, and broken or poor contact of lead wire. The failure area of the compensation capacitor is generally the failure of the compensation capacitor body or the broken or poor contact of the lead wire. When the fault is handled in the field, the plug head, lead wire and capacitor shell need to be removed and replaced, and the lead wire clamp, track bottom clamp, sleeper clamp, shell fastening bolt and plug need to be removed. After the faulty capacitor is removed, the new capacitor needs to be installed and fixed. The number of fasteners to be disassembled is large, the operation is complicated, the maintenance workload is large, and the cost of overall replacement of the capacitor is high due to the large number of compensation capacitors along the railway. Therefore, a split type track circuit compensation capacitor needs to be developed, which can realize the replacement of the faulty module alone after the failure area is determined. SUMMARY

[0006] ​In order to overcome the prior art, the utility model provides a split type track circuit compensation capacitor and track circuit, track circuit compensation capacitor adopts split type structure design can realize the separate replacement when compensation capacitor body or lead -in line failure, can reduce the field maintenance workload, reduces the fault processing time, reduces the cost of equipment replacement.

[0007] The utility model employs the technical scheme, a split type track circuit compensation capacitor, including compensation capacitor body and lead -in line,

[0008] The compensation capacitor body is detachably connected with the lead -in line,

[0009] The compensation capacitor body is provided with the lead -in line on both sides.

[0010] Further,

[0011] The compensation capacitor body includes capacitor core, lead -out line and protection shell,

[0012] The capacitor core is located in the protection shell, and the end face of the capacitor core on both sides is connected with a lead -out line,

[0013] The end of the lead -out line away from the capacitor core is detachably connected with the lead -in line through the quick connector after passing through the protection shell.

[0014] Further,

[0015] The quick connector includes a matched connecting connector and quick plug,

[0016] The protection shell is provided with a connecting connector on both sides,

[0017] The end of the lead -out line away from the capacitor core is connected on the connecting connector,

[0018] One end of the lead -in line is provided with the quick plug.

[0019] Further,

[0020] The protection shell includes metal shell, plastic shell and protection cover,

[0021] The capacitor core is wrapped with the metal shell, the metal shell is wrapped with the plastic shell, and the plastic shell is wrapped with the protection cover,

[0022] The capacitor core and the metal shell, the metal shell and the plastic shell, and the plastic shell and the protection cover are filled with epoxy resin potting.

[0023] Further,

[0024] The connecting joint comprises a mounting plate and inner and outer connecting parts located on both sides of the mounting plate;

[0025] The mounting plate is fixed on the outside of the protective shell through threaded connection;

[0026] The end of the lead-out wire away from the capacitor core is fixedly connected to the inner connecting part;

[0027] The outer connecting part is adapted to the quick connector and detachably connected thereto.

[0028] Further,

[0029] The end of the lead-in wire away from the compensating capacitor body is provided with a plug head or a copper terminal, and the lead-in wire is connected to the steel rail of the track through the plug head or the copper terminal.

[0030] Based on the same inventive concept, the utility model also provides a track circuit, which comprises the split type track circuit compensating capacitor as described above.

[0031] Compared with the prior art, the utility model has the beneficial effects that:

[0032] 1. The split type structure design of the track circuit compensating capacitor can realize separate replacement when the compensating capacitor body or the lead-in wire fails, when the fault position of the compensating capacitor is determined, only the detachable connection between the compensating capacitor body and the lead-in wire needs to be disconnected, and the fixing device of the compensating capacitor body or the lead-in wire needs to be removed, so that the whole device does not need to be removed and replaced, the on-site maintenance workload can be reduced, the fault processing time can be reduced, and the cost of equipment replacement can be reduced;

[0033] 2. The compensating capacitor body comprises a capacitor core, a lead-out wire and a protective shell, the protective shell can well protect the capacitor core, since the capacitor core is located in the middle of the protective shell, the lead-out wire is arranged as a transition to facilitate further electrical connection with the lead-in wire, and the quick connector can conveniently and quickly realize the detachable connection between the compensating capacitor body and the lead-in wire;

[0034] 3. The capacitor core is assembled into the protective shell in a pouring manner, the protective shell comprises a metal shell, a plastic shell and a protective cover, the gaps between the capacitor core and the metal shell, the metal shell and the plastic shell and the plastic shell and the protective cover are filled with epoxy resin for pouring, so as to realize the sealing protection of the compensating capacitor, the three-layer protective structure of the protective shell can effectively protect the capacitor core, and can be beneficial to guarantee and prolong the service life of the capacitor core.

[0035] Other features and advantages of the present application will be set forth in the following description of the application, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the application. The objects and other advantages of the application can be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

[0036] The present application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative labor.

[0038] Figure 1 The working principle diagram of the track circuit compensation capacitor;

[0039] Figure 2 The structural diagram of the integral track circuit compensation capacitor in the prior art;

[0040] Figure 3 The structural diagram of the split track circuit compensation capacitor in an embodiment of the present application;

[0041] Figure 4 The structural diagram of the connection between the core lead-out wire and the connecting connector in an embodiment of the present application;

[0042] Figure 5 The structural diagram of the connecting connector in an embodiment of the present application from the first perspective;

[0043] Figure 6 The structural diagram of the connecting connector in an embodiment of the present application from the second perspective;

[0044] Figure 7 The structural diagram of the quick connector in an embodiment of the present application.

[0045] Marked in the figure: 1-compensation capacitor body, 2-lead-in wire, 3-capacitor core, 4-lead-out wire, 5-metal shell, 6-plastic shell, 7-protection cover, 8-epoxy resin, 9-connecting connector, 10-quick connector, 11-mounting plate, 12-internal connecting boss, 13-external connecting boss, 14-internal threaded hole, 15-male connector, 16-female connector, 17-connecting bolt, 18-fixing hole, 19-copper end face, 20-wire pressing plate, 21-protection cap, 22-plug head, 23-connection welding point. DETAILED DESCRIPTION

[0046] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0047] like Figures 3 to 7 As shown, this embodiment discloses a split-type track circuit compensation capacitor, including a compensation capacitor body 1 and lead wires 2. The compensation capacitor body 1 and the lead wires 2 are detachably connected, and one lead wire 2 is provided on each side of the compensation capacitor body 1.

[0048] In the above technical solution, the track circuit compensation capacitor adopts a split structure design, which includes two parts: the compensation capacitor body 1 and the lead wire 2. A lead wire 2 can be detachably connected to each side of the compensation capacitor body 1. The split structure design of the track circuit compensation capacitor allows for individual replacement of the compensation capacitor body 1 or the lead wire 2 when they fail. Once the location of the compensation capacitor failure is determined, it is only necessary to disconnect the detachable connection between the compensation capacitor body 1 and the lead wire 2 and remove the fixing device of the compensation capacitor body 1 or the lead wire 2. It is not necessary to completely dismantle and replace the entire capacitor, which can reduce the workload of on-site maintenance, reduce the time for troubleshooting, and reduce the cost of equipment replacement.

[0049] In a preferred embodiment, the compensation capacitor body 1 includes a capacitor core 3, lead wires 4, and a protective housing. The capacitor core 3 is located inside the protective housing. Each end face of the capacitor core 3 is connected to a lead wire 4. The end of the lead wire 4 furthest from the capacitor core 3 passes through the protective housing and is detachably connected to the lead wire 2 via a quick-connect coupling. In this embodiment, the protective housing is used to protect the capacitor core 3. Since the capacitor core 3 is located in the middle of the protective housing, the lead wires 4 serve as a transition to facilitate further electrical connection with the lead wire 2. The quick-connect coupling allows for convenient and quick detachable connection between the compensation capacitor body 1 and the lead wire 2. Specifically, in this embodiment, the lead wire 2 is a rubber-insulated, tin-plated copper core conductor flexible cable with a conductor cross-sectional area of ​​8 mm². 2 The rated voltage is 450V / 750V; the core lead wire 4 in this embodiment is a soft copper braided wire.

[0050] Further, the protective shell comprises a metal shell 5, a plastic shell 6 and a protective cover 7, the capacitor core 3 is wrapped by the metal shell 5, the metal shell 5 is wrapped by the plastic shell 6, the plastic shell 6 is wrapped by the protective cover 7, and the capacitor core 3, the metal shell 5, the plastic shell 6 and the protective cover 7 are filled with epoxy resin 8 for pouring. In the embodiment, the capacitor core 3 is assembled into the protective shell by pouring, the protective shell comprises the metal shell 5, the plastic shell 6 and the protective cover 7, the gaps between the capacitor core 3 and the metal shell 5, the metal shell 5 and the plastic shell 6 and the plastic shell 6 and the protective cover 7 are filled with the epoxy resin 8 for pouring, so as to realize the sealing protection of the compensation capacitor, the metal shell 5 is a first layer of protection for the capacitor core 3, the plastic shell 6 is a second layer of protection for the capacitor core 3, and the protective cover 7 is a third layer of protection for the capacitor core 3, the capacitor core 3 can be effectively protected by the three layers of protection, and the service life of the capacitor core 3 can be guaranteed and prolonged.

[0051] Further, the quick connector comprises a matched connecting connector 9 and a quick plug 10, one connecting connector 9 is fixed on each side of the protective shell, the end of the lead-out wire 4 away from the capacitor core 3 is connected to the connecting connector 9, and one end of the lead-in wire 2 is fixed with the quick plug 10. When the protective shell adopts the three-layer protection structure of the metal shell 5, the plastic shell 6 and the protective cover 7, the protective cover 7 is located at the outermost layer, one connecting connector 9 is fixed on each side of the protective cover 7, the capacitor core 3 and the connecting connector 9 can be well connected through the lead-out wire 4, and the lead-in wire 2 can be quickly connected to the connecting connector 9 through the quick plug 10.

[0052] As a preferred technical solution, the connecting joint 9 comprises a mounting plate 11 and inner and outer connecting portions on both sides of the mounting plate 11, the mounting plate 11 is fixed on the outside of the protective shell through threaded connection, one end of the lead-out wire 4 away from the capacitor core 3 is fixedly connected to the inner connecting portion, and the outer connecting portion is adapted to the quick connector 10 and detachably connected to the quick connector 10. Further, a plurality of male connectors 15 are arranged on the outer connecting portion, a connecting end of the quick connector 10 is provided with a plurality of female connectors 16 adapted to the male connectors 15, and the connecting end of the quick connector 10 is threadedly connected to the outer connecting portion. In the embodiment, the inner connecting portion of the connecting joint 9 is an inner connecting boss 12, the outer connecting portion is an outer connecting boss 13, the mounting plate 11 is fixed on one side of the protective shell 7 through threaded connection, one end of the lead-out wire 4 away from the capacitor core 3 is welded to the inner connecting boss 12, the middle part of the end face of the outer connecting boss 13 is provided with an inner threaded hole 14 adapted to a connecting bolt 17, a plurality of male connectors 15 are arranged around the end face, the connecting end of the quick connector 10 is electrically connected to the male connector 15 through the female connector 16, the middle part of the connecting end of the quick connector 10 is provided with a connecting hole adapted to the connecting bolt 17, and the quick connector 10 is fixed to the outer connecting boss 13 through the connecting bolt 17.

[0053] In some embodiments, the connection between the connecting joint 9 and the lead-out wire 4 of the core is as shown in Figure 4 , in which three lead-out wires 4 are arranged on both sides of the core, the lead-out wire 4 is a copper braid wire, one end of which is connected (soldered) to the end face of the capacitor core 3, and the other end is welded to a copper end face 19 of the connecting joint 9; the connection between the copper braid wire and the copper end face 19 forms a connecting welding point 23.

[0054] Specifically, the protective shell 7 is provided with through holes on both sides for mounting the connecting joint 9, and the structure of the connecting joint 9 is as shown in Figure 5 , 6 , the mounting plate 11 is square, one fixing hole 18 is arranged on each corner of the mounting plate 11, the fixing hole 18 is a fastening bolt hole, there are a total of four fixing holes 18 for connecting and fixing the connecting joint 9 and the protective shell 7, the connecting joint 9 and the protective shell 7 are detachably connected, the mounting plate 11 is fastened to the protective shell 7 through four bolts, and in specific implementation, the gap at the contact surface of the protective shell 7 and the connecting joint 9 is sealed and protected by sealing glue. The middle part of the end face of the outer connecting boss 13 is provided with an inner threaded hole 14 (the threaded hole does not penetrate through, and the root part is 5 mm away from the end face of the inner connecting boss 12 to realize sealing compensation of the internal space of the capacitor protective shell 7), which is used for threadedly fastening and connecting the quick connector 10.

[0055] Specifically, one side of the inner connecting boss 12 is provided with a cable connector integrated with the inner connecting boss 12, and the cable connector forms the male connector 15 after passing through the outer connecting boss 13. In this embodiment, five male connectors 15 are provided for connecting with the quick connector 10 on the lead wire 2 to achieve electrical connection. In this embodiment, the inner connecting boss 12 and the cable connector are integrally formed by brass, and the inner end surface of the inner connecting boss 12 forms a copper end surface 19. The surface of the copper end surface 19 is tin-plated, and the solderability is good, which facilitates the welding of the lead wire 4 of the capacitor core 3.

[0056] Specifically, as shown in the drawings, Figure 7 The female connector 16 is provided with five female connectors 16, and the lead wire 2 is connected with the quick connector 10 by welding. The end of the lead wire 2 is composed of multiple strands (five strands in this embodiment), which are respectively welded (soldered) with the five female connectors 16. The connecting bolt 17 is connected with the inner threaded hole 14 of the connecting connector 9. The five female connectors 16 are respectively connected with the five male connectors 15 in the connecting connector 9 by interference fit. The material of the female connector 16 and the male connector 15 is copper conductor, which achieves electrical connection. A wire pressing plate 20 is also provided for pressing and fastening the lead wire 2 and the quick connector 10. One end of the lead wire 2 is connected with the quick connector 10, and the other end is pressed with a plug head 22, and finally connected to the rail.

[0057] In some embodiments, a protective cap 21 is provided on both sides of the protective cover 7 for protecting the quick connector. The protective cap 21 designed in this embodiment can cover the connection between the compensation capacitor body 1 and the lead wire 2 (i.e. the quick connector, including the connecting connector 9 and the quick connector 10), avoiding direct exposure to sunlight and rain, and playing a good protective role. Specifically, the protective cap 21 can be a baffle structure provided on the protective cover 7 to cover the upper area of the quick connector.

[0058] As a preferred technical solution, the end of the lead wire 2 away from the compensation capacitor body 1 is provided with a plug head 22 or a copper wire terminal, and the lead wire 2 is connected to the rail of the track through the plug head 22 or the copper wire terminal. In this embodiment, the plug head 22 or the copper wire terminal is connected with the lead wire 2 by pressing. The plug head 22 or the copper wire terminal is used to connect the compensation capacitor to the rail. In this embodiment, the plug head 22 is provided at one end of the capacitor core 3.

[0059] Based on the same inventive concept, this embodiment also provides a manufacturing method of a split type track circuit compensation capacitor. A preferred process flow is as follows: core winding-core gold spraying and lead wire welding-core heat setting-core testing-metal shell assembly vacuum filling-semi-finished product testing-plastic shell assembly filling-connecting connector and protective cover assembly filling-quick connector and lead wire welding assembly-terminal pressing-gumming and vulcanization-compensation capacitor body and lead wire assembly.

[0060] The manufacturing method comprises:

[0061] Core winding: winding the metalized dielectric film through winding equipment to form a capacitor core; in this embodiment, the capacitor core is a thin film capacitor, the metalized dielectric film is wound through winding equipment to form a capacitor core.

[0062] Core gold spraying and lead wire welding: spraying a metal layer on the two end faces of the capacitor core as the lead-out electrode of the capacitor, and welding a lead wire on each of the lead-out electrodes on the two sides of the core; in this embodiment, the capacitor core is a cylindrical type, and the gold spraying process is to spray a metal layer, generally zinc or zinc-tin alloy, on the two end faces of the cylindrical core as the lead-out electrode of the capacitor.

[0063] Core heat setting: heat setting the capacitor core after gold spraying and lead wire welding; in this embodiment, the capacitor core is placed in a temperature test box for heat treatment at a certain temperature.

[0064] Core testing: testing and screening the capacitor core, and the testing indexes include capacitance, loss tangent tan δ and withstand voltage; this step is to screen and test the core, and to remove unqualified cores.

[0065] Metal shell assembly vacuum filling: placing the capacitor core into the metal shell, and then placing it in a vacuum device for vacuum filling, so that the epoxy filling material is filled between the capacitor core and the metal shell for solidification protection; in this embodiment, the capacitor core is placed into the metal shell, and in the vacuum device, a certain temperature and vacuum degree are controlled, so that the filling material flows into the gap between the metal shell and the capacitor core and solidifies, and after solidification, one lead-out wire is exposed on each side of the metal shell. The purpose of vacuum filling is to remove impurities such as air and moisture in the core and the metal shell, so that the inside of the capacitor is in a vacuum state, so as to achieve better sealing effect.

[0066] Semi-finished product testing: testing and screening the capacitor after assembly of the metal shell and solidification of the filling, and the testing indexes include capacitance, loss tangent tan δ and withstand voltage; this step is to screen and test the capacitor after assembly of the metal shell and solidification of the filling, and to remove unqualified semi-finished products.

[0067] Plastic shell assembly filling: placing the metal shell wrapped with the capacitor core into the plastic shell, filling the epoxy filling material between the metal shell and the plastic shell for solidification protection, and after solidification, one lead-out wire is exposed on each side of the plastic shell, and the filling material is filled in the gap between the metal shell and the plastic shell to realize the second protection of the capacitor core.

[0068] The two connecting joints are fixed to the two sides of the protective cover respectively, the plastic shell wrapping the capacitor core and the metal shell is placed in the protective cover, then the lead-out wires on the two sides of the plastic shell are welded to the connecting joints on the two sides of the protective cover respectively, and finally the epoxy sealant is poured between the plastic shell and the protective cover for curing protection, so that the compensation capacitor body is obtained; in this embodiment, one end of the lead-out wire is connected to the lead-out electrode of the capacitor core, and the other end is connected to the connecting joint, and the third layer of protection for the capacitor core is realized by filling the sealant in the gap between the plastic shell and the protective cover.

[0069] The lead-out wire is welded and assembled to the quick connector; the quick connector is welded and assembled to one end of the lead-out wire, which facilitates the quick connection with the connecting joint.

[0070] Terminal crimping: using a crimping device to crimp a plug head or a copper wire terminal on the other end of the lead-out wire; in this embodiment, the plug head or the copper wire terminal is crimped together with the other end of the lead-out wire by using a crimping device.

[0071] Rubber sheath vulcanization: the connection between the plug head or the copper wire terminal and the lead-out wire is wrapped with a rubber sheath and then subjected to vulcanization treatment; in this embodiment, the connection between the plug head or the copper wire terminal and the lead-out wire is wrapped with a rubber sheath and subjected to vulcanization treatment, thereby improving the sealing and waterproof performance of the connection.

[0072] The compensation capacitor body and the lead-out wire are assembled: the connecting joint on the compensation capacitor body is connected with the quick connector on the lead-out wire to assemble the whole track circuit compensation capacitor.

[0073] Based on the same inventive concept, the embodiment also provides a track circuit, which comprises a track circuit compensation capacitor, and the track circuit compensation capacitor adopts the split type track circuit compensation capacitor as described above or is made by the manufacturing method as described above.

[0074] The fixing methods or fixed connection methods not described in this embodiment can adopt threaded connection or welding, or other existing connection methods according to specific positions, and both threaded connection and welding belong to the prior art, which will not be described in detail here.

[0075] The parts not involved in this embodiment are the same as or can be realized by the prior art, which will not be described further here.

[0076] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features therein can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A split rail circuit compensation capacitor, characterized in that, it comprises a compensation capacitor body and a lead wire; the compensation capacitor body is detachably connected with the lead wire; each side of the compensation capacitor body is provided with one lead wire; the compensation capacitor body comprises a capacitor core, a lead wire and a protective shell; the capacitor core is located in the protective shell, and the end face of each side of the capacitor core is connected with one lead wire; the end of the lead wire away from the capacitor core is detachably connected with the lead wire through a quick connector after passing through the protective shell; the protective shell comprises a metal shell, a plastic shell and a protective cover; the capacitor core is wrapped by the metal shell, the metal shell is wrapped by the plastic shell, and the plastic shell is wrapped by the protective cover; the capacitor core and the metal shell, the metal shell and the plastic shell, and the plastic shell and the protective cover are filled with epoxy resin potting.

2. The split rail circuit compensation capacitor according to claim 1, characterized in that, the quick connector comprises a matching connecting connector and a quick connector plug; one connecting connector is fixed on each side of the protective shell; the end of the lead wire away from the capacitor core is connected to the connecting connector; one end of the lead wire is fixed with the quick connector plug.

3. The split rail circuit compensation capacitor according to claim 2, characterized in that, the connecting connector comprises a mounting plate and inner and outer connecting parts located on both sides of the mounting plate; the mounting plate is fixed on the outside of the protective shell through threaded connection; the end of the lead wire away from the capacitor core is fixedly connected to the inner connecting part; the outer connecting part is matched with the quick connector plug and detachably connected with the quick connector plug.

4. The split rail circuit compensation capacitor according to any one of claims 1-3, characterized in that, one end of the lead wire away from the compensation capacitor body is provided with a plug head or a copper terminal, and the lead wire is connected to the rail through the plug head or the copper terminal.

5. A track circuit, characterized in that the rail circuit comprises the split rail circuit compensation capacitor according to any one of claims 1-4.

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