Variable-resistance isolation equipment for 25Hz phase-sensitive track circuit

Abstract

The utility model provides variable-resistance isolation equipment for a 25Hz phase-sensitive track circuit. The variable-resistance isolation equipment comprises a first binding post, a second binding post, a third binding post, a fourth binding post, a fifth binding post, a sixth binding post, a seventh binding post, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and an inductor, the first resistor is connected in series between the first binding post and the second binding post, the second resistor is connected in series between the second binding post and the third binding post, the third resistor is connected in series between the third binding post and the fourth binding post, and the fourth resistor is connected in series between the fourth binding post and the fifth binding post. The fifth resistor is connected between the fifth binding post and the sixth binding post in series, the inductor is connected between the sixth binding post and the seventh binding post in series, the first resistor is 0.8 ohm, the second resistor is 1.4 ohm, the third resistor is 2.8 ohm, the fourth resistor is 4.4 ohm, the fifth resistor is 4.4 ohm, and the value of the inductor is 2.5 mH. Reliable shunting of a track circuit is guaranteed, and coded signals are effectively isolated and prevented from entering a track circuit system.

Description

Technical Field

[0001] The utility model relates to the technical field of track circuits, in particular to a variable resistance isolation device for a 25Hz phase-sensitive track circuit. Background Art

[0002] In China, 25Hz phase-sensitive track circuits are widely used in electrified railway stations. As one of the components of the 25Hz phase-sensitive track circuit, the rheostat, also known as the current-limiting resistor, is used to protect the power supply from being burned out when a short circuit occurs at the sending end of the track circuit. The current-limiting resistor at the sending end must be fixed according to the specified value and cannot be adjusted smaller, let alone adjusted to zero. The resistance at the receiving end is allowed to be adjusted from zero to the full resistance value as needed for the track circuit. At present, there are sometimes problems such as poor shunting effect and codeless interference in some existing track sections, which affect the safety of railway operation. Content of the Utility Model

[0003] Based on this, the purpose of the utility model is to provide a variable resistance isolation device for a 25Hz phase-sensitive track circuit, which improves the shunting sensitivity of the track circuit, ensures reliable shunting of the track circuit, isolates the codeless signal to prevent it from entering the track circuit system, and ensures the reliable operation of the track circuit. To achieve the above purpose, the technical solution of the utility model is as follows:

[0004] A variable resistance isolation device for a 25Hz phase-sensitive track circuit is used to be connected in series between a terminal of the signal side of the choking transformer at the sending end and a terminal of the secondary side of the track transformer at the sending end, and includes a first terminal, a second terminal, a third terminal, a fourth terminal, a fifth terminal, a sixth terminal, a seventh terminal, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and an inductor;

[0005] The first end of the first resistor is electrically connected to the first terminal, the second end of the first resistor is electrically connected to the second terminal, the first end of the second resistor is electrically connected to the second terminal, the second end of the second resistor is electrically connected to the third terminal, the first end of the third resistor is electrically connected to the third terminal, the second end of the third resistor is electrically connected to the fourth terminal, the first end of the fourth resistor is electrically connected to the fourth terminal, the second end of the fourth resistor is electrically connected to the fifth terminal, the first end of the fifth resistor is electrically connected to the fifth terminal, the second end of the fifth resistor is electrically connected to the sixth terminal, the first end of the inductor is electrically connected to the sixth terminal, and the second end of the inductor is electrically connected to the seventh terminal;

[0006] The resistance value of the first resistor is 0.8Ω, the resistance value of the second resistor is 1.4Ω, the resistance value of the third resistor is 2.8Ω, the resistance value of the fourth resistor is 4.4Ω, the resistance value of the fifth resistor is 4.4Ω, and the value of the inductor is 2.5mH.

[0007] Furthermore, the variable resistance isolation device for the 25Hz phase-sensitive track circuit also includes a box body, and the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor and the inductor are all arranged in the box body; the first terminal, the second terminal, the third terminal, the fourth terminal, the fifth terminal, the sixth terminal and the seventh terminal are all fixedly installed on the surface of the box body, and the bottom ends of the first terminal, the second terminal, the third terminal, the fourth terminal, the fifth terminal, the sixth terminal and the seventh terminal all extend into the box body.

[0008] The beneficial effects of the utility model are:

[0009] The utility model provides a 25Hz phase-sensitive track circuit variable resistor isolation device, which further improves the branching sensitivity of the track circuit by increasing the impedance, thereby ensuring reliable branching of the track circuit, isolating the coded signal to prevent it from entering the track circuit system, and ensuring reliable operation of the track circuit; when a short circuit occurs at the power transmission end of the track circuit, it effectively protects the power supply from being burned out, and is also compatible with the existing 4.4 ohm and 6.9 ohm varistors; it effectively ensures railway driving safety, has a large demand, and brings considerable economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the principle block diagram of a variable resistance isolation device for a 25Hz phase-sensitive track circuit according to an embodiment of the utility model;

[0011] Figure 2 The schematic diagram of the circuit is that the variable resistance isolation device for 25Hz phase-sensitive track circuit is applied to the power supply end of the 25Hz phase-sensitive track circuit. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical solution and advantages of the utility model clearer, the variable resistance isolation device for the 25Hz phase-sensitive track circuit of the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be noted that the features of the following embodiments and embodiments can be combined with each other without conflict. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0013] Reference Figure 1 and Figure 2, the variable resistance isolation device for the 25Hz phase-sensitive track circuit according to an embodiment of the present utility model is used to be connected in series between a terminal on the signal side of the feeder-end choke transformer BE25 and a terminal on the secondary side of the feeder-end track transformer BG25.

[0014] The variable resistance isolation device for the 25Hz phase-sensitive track circuit includes a first terminal 1, a second terminal a, a third terminal b, a fourth terminal c, a fifth terminal d, a sixth terminal e, a seventh terminal 2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and an inductor L1;

[0015] The first end of the first resistor R1 is electrically connected to the first terminal 1, and the second end of the first resistor R1 is electrically connected to the second terminal a; the first end of the second resistor R2 is electrically connected to the second terminal a, and the second end of the second resistor R2 is electrically connected to the third terminal b; the first end of the third resistor R3 is electrically connected to the third terminal b, and the second end of the third resistor R3 is electrically connected to the fourth terminal c; the first end of the fourth resistor R4 is electrically connected to the fourth terminal c, and the second end of the fourth resistor R4 is electrically connected to the fifth terminal d; the first end of the fifth resistor R5 is electrically connected to the fifth terminal d, and the second end of the fifth resistor R5 is electrically connected to the sixth terminal e; the first end of the inductor L1 is electrically connected to the sixth terminal e, and the second end of the inductor L1 is electrically connected to the seventh terminal 2.

[0016] The resistance value of the first resistor R1 is 0.8Ω, the resistance value of the second resistor R2 is 1.4Ω, the resistance value of the third resistor R3 is 2.8Ω, the resistance value of the fourth resistor R4 is 4.4Ω, the resistance value of the fifth resistor R5 is 4.4Ω, and the value of the inductor L1 is 2.5mH.

[0017] That is to say, the resistance values and inductance values between the respective terminals (terminals) are as follows:

[0018] (1) Terminal 1 - a: 0.8Ω.

[0019] (2) Terminal a - b: 1.4Ω.

[0020] (3) Terminal b - c: 2.8Ω.

[0021] (4) Terminal c - d: 4.4Ω.

[0022] (5) Terminal d - e: 4.4Ω.

[0023] (6) Terminal e - 2: 2.5mH.

[0024] The 25Hz phase-sensitive track circuit variable resistance isolation device is installed at the power supply end of the track circuit, and is connected in series between a terminal on the signal side of the choke transformer BE25 at the power supply end and a terminal on the secondary side of the track transformer BG25 at the power supply end; Figure 2 In Figure 2 , the first terminal 1 of the 25Hz phase-sensitive track circuit variable resistance isolation device is electrically connected to a terminal on the secondary side of the track transformer BG25 at the power supply end, and the seventh terminal 2 of the 25Hz phase-sensitive track circuit variable resistance isolation device is electrically connected to a terminal on the signal side of the choke transformer BE25 at the power supply end. In other embodiments, the first terminal 1 of the 25Hz phase-sensitive track circuit variable resistance isolation device can be electrically connected to a terminal on the signal side of the choke transformer BE25 at the power supply end, and the seventh terminal 2 of the 25Hz phase-sensitive track circuit variable resistance isolation device can be electrically connected to a terminal on the secondary side of the track transformer BG25 at the power supply end.

[0025] The output side of the choke transformer BE25 at the power supply end is respectively electrically connected to two parallel rails 3. A fuse RD is also serially provided at the input end of the track transformer BG25 at the power supply end, and a fuse RD can also be serially provided between the output end of the track transformer BG25 at the power supply end and the input end of the choke transformer BE25 at the power supply end.

[0026] Setting the 25Hz phase-sensitive track circuit variable resistance isolation device mainly realizes that when a short circuit occurs at the power supply end of the track circuit, while protecting the power supply from being burned out, further improving the shunt sensitivity of the track circuit by increasing the impedance, and realizing isolating the coded signal from entering the track circuit system to ensure the reliable operation of the track circuit.

[0027] Preferably, the variable resistance isolation device for the 25Hz phase-sensitive track circuit further includes a box body. The first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, and the inductor L1 are all arranged inside the box body; the first terminal 1, the second terminal a, the third terminal b, the fourth terminal c, the fifth terminal d, the sixth terminal e, and the seventh terminal 2 are all fixedly installed on the surface of the box body, and the bottom ends of the first terminal 1, the second terminal a, the third terminal b, the fourth terminal c, the fifth terminal d, the sixth terminal e, and the seventh terminal 2 all extend into the box body. That is, the outer wall of the box body has through holes, and each terminal respectively penetrates through its corresponding through hole. One end of each terminal is inside the box body, and the other end is outside the box body. The two ends of each terminal can be respectively fixed to the box body by nuts. The terminal has an external thread, and the nut is screwed onto the terminal. Setting the box body plays a role in protecting the circuit and is also convenient for installation and maintenance.

[0028] The variable resistor isolation equipment for the 25Hz phase-sensitive track circuit in the above embodiments further improves the shunt sensitivity of the track circuit by increasing the impedance, thereby ensuring reliable shunt of the track circuit, isolating the coded signal to prevent it from entering the track circuit system, and ensuring reliable operation of the track circuit; when a short circuit occurs at the power transmission end of the track circuit, it effectively protects the power supply from being burned out, and is also compatible with the existing 4.4 ohm and 6.9 ohm varistors in use. It ensures reliable shunt of the track circuit while ensuring reliable operation of the track circuit; while improving the shunt sensitivity of the 25Hz phase-sensitive track circuit and improving the shunt effect of the track circuit, it effectively isolates the coded signal to prevent it from entering the track circuit system. It can assist in solving the problems of poor shunt effect and coded interference in some track sections on site, effectively ensuring railway driving safety, with large demand and considerable economic benefits.

[0029] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and any equivalent implementation methods or changes made without departing from the technical spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A variable resistance isolation device for a 25Hz phase-sensitive track circuit, used to be connected in series between a terminal on the signal side of a choke transformer (BE25) at the power transmission end and a terminal on the secondary side of a track transformer (BG25) at the power transmission end, characterized in that: The invention comprises a first terminal (1), a second terminal (a), a third terminal (b), a fourth terminal (c), a fifth terminal (d), a sixth terminal (e), a seventh terminal (2), a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5) and an inductor (L1); The first end of the first resistor (R1) is electrically connected to the first terminal (1), the second end of the first resistor (R1) is electrically connected to the second terminal (a), the first end of the second resistor (R2) is electrically connected to the second terminal (a), the second end of the second resistor (R2) is electrically connected to the third terminal (b), the first end of the third resistor (R3) is electrically connected to the third terminal (b), the second end of the third resistor (R3) is electrically connected to the fourth terminal (c), the first end of the fourth resistor (R4) is electrically connected to the fourth terminal (c), the second end of the fourth resistor (R4) is electrically connected to the fifth terminal (d), the first end of the fifth resistor (R5) is electrically connected to the fifth terminal (d), the second end of the fifth resistor (R5) is electrically connected to the sixth terminal (e), the first end of the inductor (L1) is electrically connected to the sixth terminal (e), and the second end of the inductor (L1) is electrically connected to the seventh terminal (2); The resistance value of the first resistor (R1) is 0.8Ω, the resistance value of the second resistor (R2) is 1.4Ω, the resistance value of the third resistor (R3) is 2.8Ω, the resistance value of the fourth resistor (R4) is 4.4Ω, the resistance value of the fifth resistor (R5) is 4.4Ω, and the value of the inductor (L1) is 2.5mH.

2. The variable resistance isolation device for 25Hz phase-sensitive track circuit according to claim 1 is characterized in that: The invention also comprises a box body, wherein the first resistor (R1), the second resistor (R2), the third resistor (R3), the fourth resistor (R4), the fifth resistor (R5) and the inductor (L1) are all arranged in the box body; the first terminal (1), the second terminal (a), the third terminal (b), the fourth terminal (c), the fifth terminal (d), the sixth terminal (e) and the seventh terminal (2) are all fixedly mounted on the surface of the box body, and the bottom ends of the first terminal (1), the second terminal (a), the third terminal (b), the fourth terminal (c), the fifth terminal (d), the sixth terminal (e) and the seventh terminal (2) extend into the box body.

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