A track circuit detection device

Abstract

The application provides a track circuit detection device, and relates to the technical field of track circuit detection. The two-element unit comprises a first capacitor and a first transformer, and the first capacitor is connected in series with the primary side of the first transformer; the three-element unit comprises a second capacitor, a third capacitor and a second transformer, the second capacitor is connected in series with the primary side of the second transformer, and the third capacitor is connected in parallel with the primary side of the second transformer. The transformers are arranged in the two-element unit and the three-element unit, so that when the voltage across the primary side inductor is too large, the voltage can be appropriately reduced to facilitate signal transmission; the impedance reflected from the secondary side of the transformer to the primary side is increased due to the increase of the transformation ratio, so that the impedance is connected in parallel with the inductance impedance of the primary side, the stability of the primary side inductance is ensured, and the signal acquisition point is arranged at the two ends of the secondary side of the first transformer or the second transformer, so that the voltage signal can be greatly enhanced. Furthermore, the accuracy of track circuit detection can be improved.

Description

Technical Field

[0001] This application relates to the field of track circuit technology, and in particular to a track circuit detection device. Background Technology

[0002] The ZPW-2000A track circuit system is currently one of the most widely used railway signaling products in my country. Its main function is to achieve real-time monitoring of the rail's condition. Rail breakage is a special condition of the rail, and the ability to detect rail breakage is a key indicator of the track circuit's performance and an important guarantee for ensuring the safe and reliable operation of trains. Considering the structural characteristics of the track circuit, rail breakage inspection covers both the main rail section and the secondary rail section. Based on actual field usage, rail breakage inspection of the main rail section is safe and reliable, with few problems. However, the secondary rail section, due to the signal acquisition method, suffers from lower signal amplitude and is susceptible to interference from external signal coupling.

[0003] In conclusion, improving the accuracy of track circuit detection is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, this application provides a track circuit detection device, which aims to improve the accuracy of track circuit detection.

[0005] This application provides a track circuit detection device, comprising:

[0006] The two-element unit includes a first capacitor and a first transformer;

[0007] The first capacitor is connected in series with the primary side of the first transformer;

[0008] The three-element unit includes a second capacitor, a third capacitor, and a second transformer;

[0009] The second capacitor is connected in series with the primary side of the second transformer;

[0010] The third capacitor is connected in parallel with the primary side of the second transformer;

[0011] The signal acquisition points for the track section are set at both ends of the secondary side of the first transformer or at both ends of the secondary side of the second transformer.

[0012] Optionally, the primary inductance of the first transformer is 75uH to 110uH;

[0013] The turns ratio of the primary side to the secondary side of the first transformer is 2:1 to 10:1.

[0014] Optionally, the primary inductance of the second transformer is 75uH to 110uH;

[0015] The turns ratio of the primary side of the second transformer to the secondary side of the first transformer is 2:1 to 10:1.

[0016] Optionally, the device further includes:

[0017] Transmission channel anti-interference unit;

[0018] The transmission channel anti-interference unit is located between the signal acquisition point and the receiver in the small track section.

[0019] Optionally, the transmission channel anti-interference unit includes:

[0020] The third transformer, the fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor, the first inductor, and the second inductor;

[0021] The turns ratio of the primary side to the secondary side of the third transformer is 6:1 to 15:1.

[0022] The fourth capacitor and the fifth capacitor are connected in series and resonate in series with the secondary inductance of the third transformer at 50Hz.

[0023] The fourth capacitor and the fifth capacitor have the same capacitance value;

[0024] The capacitance values ​​of the fourth capacitor and the fifth capacitor are 1000~5000uF;

[0025] The sixth capacitor and the first inductor are connected in parallel with the primary side of the third transformer;

[0026] The sixth capacitor and the first inductor are 50Hz second harmonic;

[0027] The seventh capacitor and the second inductor are connected in parallel with the primary side of the third transformer;

[0028] The seventh capacitor and the second inductor are 50Hz third harmonic.

[0029] Optionally, the device further includes:

[0030] Small track signal amplitude conditioning unit;

[0031] The small track signal amplitude conditioning unit is located between the signal acquisition point and the receiver in the small track section.

[0032] Optionally, the small track signal amplitude conditioning unit includes:

[0033] First resistor, second resistor, third resistor, and fourth resistor;

[0034] The first resistor, the second resistor, the third resistor, and the fourth resistor constitute a bridge circuit structure;

[0035] The first resistor, the second resistor, and the third resistor are equal;

[0036] The resistance values ​​of the first resistor, the second resistor, and the third resistor are 1000 to 100000 kΩ;

[0037] The resistance value of the fourth resistor is related to the input voltage amplitude.

[0038] Optionally, the transmission channel anti-interference unit is located on the side of the small track section closer to the signal acquisition point between the signal acquisition point and the receiver.

[0039] Optionally, the small track signal amplitude conditioning unit is located on the side closer to the receiver between the signal acquisition point and the receiver in the small track section.

[0040] Optionally, the device further includes:

[0041] SVA hollow coil; the SVA hollow coil is connected in parallel with the two-element unit and the three-element unit.

[0042] This application provides a track circuit detection device. The device includes a two-element unit and a three-element unit. The two-element unit includes a first capacitor and a first transformer, with the first capacitor connected in series with the primary side of the first transformer. The three-element unit includes a second capacitor, a third capacitor, and a second transformer, with the second capacitor connected in series with the primary side of the second transformer and the third capacitor connected in parallel with the primary side of the second transformer. Furthermore, the signal acquisition point for the track section is located at both ends of the secondary side of the first transformer or the secondary side of the second transformer. By including transformers in the two-element and three-element units, when the voltage across the primary-side inductor is too high, a voltage reduction can be applied to facilitate signal transmission. The impedance reflected from the secondary side of the transformer to the primary side increases due to the increased turns ratio; this parallel connection with the primary-side inductor impedance ensures the stability of the primary-side inductance. Furthermore, placing the signal acquisition point at both ends of the secondary side of the first or second transformer greatly enhances the voltage signal. This, in turn, improves the accuracy of track circuit detection. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in this embodiment or the prior art, the drawings used in the description of the embodiment or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the structure of the small track section of the existing track circuit provided in the embodiments of this application;

[0045] Figure 2 This is a schematic diagram of the structure of an existing track circuit transmission channel provided in an embodiment of this application;

[0046] Figure 3 This is a schematic diagram of the structure of a track circuit detection device provided in an embodiment of this application;

[0047] Figure 4 This is a schematic diagram of the structure of a two-element unit provided in an embodiment of this application;

[0048] Figure 5 This is a schematic diagram of the structure of the three-element unit provided in the embodiments of this application;

[0049] Figure 6 This is a schematic diagram of the structure of the transmission channel anti-interference unit provided in the embodiments of this application;

[0050] Figure 7 This is a schematic diagram of the transmission channel conditioning unit provided in an embodiment of this application. Detailed Implementation

[0051] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. This application provides a track circuit detection device, which relates to the field of track circuit technology. The above are merely examples and do not limit the application field of the device provided in this application.

[0052] The ZPW-2000A track circuit system is currently one of the most widely used railway signaling products in my country. Its main function is to achieve real-time monitoring of the rail's condition. Rail breakage is a special condition of the rail, and the ability to detect rail breakage is a key indicator of the track circuit's performance and an important guarantee for ensuring the safe and reliable operation of trains. Considering the structural characteristics of the track circuit, rail breakage inspection covers both the main rail section and the secondary rail section. Based on actual field usage, rail breakage inspection of the main rail section is safe and reliable, with few problems. However, the secondary rail section, due to the signal acquisition method, suffers from lower signal amplitude and is susceptible to interference from external signal coupling.

[0053] The minor track section is the dividing area between adjacent main track sections of the track circuit, such as... Figure 1 As shown, Figure 1This is a schematic diagram of the structure of a conventional track circuit's small track section provided in an embodiment of this application. It mainly comprises a two-element unit consisting of L1 and C1; an SVA hollow coil; a three-element unit consisting of C2, L2, and C3; and a rail, the length of which is approximately 20-33m. The signal frequencies in the main track sections on both sides of the small track section are inconsistent, and are f0, f1, f2, f3, f4, f5, f6, f7, f8, f9, f10, f11, f2, f3, f11, f21, A and f B Three-element unit for f B It is a series resonance with extremely low impedance, exhibiting a short-circuit effect, thus preventing the signal from entering signal f. A Region; two-element unit for f A Series resonance, with extremely low impedance, prevents the signal from entering f. B This principle is used to achieve signal isolation between adjacent sections.

[0054] like Figure 2 As shown, Figure 2 This is a schematic diagram of the existing track circuit transmission channel provided in the embodiments of this application. In the prior art, the signal detection and processing of the small track section shares a collection point and transmission channel with the main track signal. The advantage is relatively low cost; the disadvantage is low signal-to-noise ratio, susceptibility to external signal interference, leading to deviations in the small track signal judgment results, thereby affecting train operation efficiency. Practical application experience shows that this low-cost small track section rail breakage detection method has significant potential risks and increases subsequent maintenance costs.

[0055] The inventors, through research, proposed the technical solution of this application. The device includes a two-element unit and a three-element unit. The two-element unit includes a first capacitor and a first transformer, with the first capacitor connected in series with the primary side of the first transformer. The three-element unit includes a second capacitor, a third capacitor, and a second transformer, with the second capacitor connected in series with the primary side of the second transformer and the third capacitor connected in parallel with the primary side of the second transformer. Furthermore, the signal acquisition point for the track section is located at both ends of the secondary side of the first transformer or the secondary side of the second transformer. By incorporating transformers in the two-element and three-element units, when the voltage across the primary-side inductor is too high, a voltage reduction can be appropriately applied to facilitate signal transmission. The impedance reflected from the secondary side of the transformer to the primary side increases due to the increased turns ratio; this parallel connection with the primary-side inductor impedance ensures the stability of the primary-side inductance. Moreover, placing the signal acquisition point at both ends of the secondary side of the first or second transformer greatly enhances the voltage signal. This, in turn, improves the accuracy of track circuit detection.

[0056] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all of them. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present application. It should be noted that, for ease of description, only the parts related to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of the present application can be combined with each other.

[0057] like Figure 3 As shown, Figure 3 This is a schematic diagram of a track circuit detection device provided in an embodiment of this application. The track circuit detection device includes a two-element unit a, a three-element unit b, an SVA hollow coil, a transmission channel anti-interference unit TJ, a transmission channel conditioning unit BJ, a transmitter, and a receiver. The various components of the track circuit detection device will be explained in detail below.

[0058] First, the signal acquisition points are set at both ends of the secondary side of the first transformer TU or the secondary side of the second transformer AU. The signal isolation principle between the small rail section and the main rail sections on both sides is based on the series resonance of inductor and capacitor components. The characteristic of this resonance principle is that the impedance and voltage are small at both ends of the series circuit, while the voltage is relatively large on both sides of the inductor or capacitor. Therefore, by acquiring the voltage on both sides of the inductor, a strong small rail signal can be obtained. In the existing technology, the acquisition points are sampled at the two or three components, with an impedance of about 10 to 30 mohm. When sampling is performed on both sides of the inductor, the impedance is about 800 mohm to 1600 mohm, thus greatly enhancing the voltage signal.

[0059] like Figure 4 , Figure 5 As shown, Figure 4 This is a schematic diagram of the structure of the two-element unit provided in the embodiment of this application. Figure 5This is a schematic diagram of the three-element unit provided in the embodiments of this application. Two-element unit a includes: a first capacitor 1 and a first transformer TU, wherein the first capacitor 1 is connected in series with the primary side of the first transformer TU, the inductance of the primary side of the first transformer TU is 75uH to 110uH, and the turns ratio of the primary side to the secondary side of the first transformer TU is 2:1 to 10:1. Three-element unit b includes: a second capacitor 2, a third capacitor 3, and a second transformer AU, wherein the second capacitor 2 is connected in series with the primary side of the second transformer AU, and the third capacitor 3 is connected in parallel with the primary side of the second transformer AU. The turns ratio of the primary side to the secondary side of the second transformer AU is 2:1 to 10:1. The inductance of the primary side of the second transformer AU and the primary side of the first transformer TU are both 75uH to 110uH. Thus, when the voltage across the primary inductor is too high, a voltage reduction can be appropriately applied to facilitate signal transmission; the impedance reflected from the secondary side of the transformer to the primary side increases due to the increased turns ratio, and this parallel connection with the primary inductor impedance ensures the stability of the primary inductor.

[0060] Track circuit signals are susceptible to interference from 50Hz power frequency and harmonics, therefore, interference protection design is necessary. A transformer is incorporated into the transmission channel to achieve impedance matching between the transmission channel and the rail. For example... Figure 6 As shown, Figure 6 This is a schematic diagram of the transmission channel anti-interference unit provided in this application embodiment. The transmission channel anti-interference unit TJ includes: a third transformer 6, a fourth capacitor 4, a fifth capacitor 5, a sixth capacitor 7, a seventh capacitor 9, a first inductor 8, and a second inductor 10. The primary-to-secondary turns ratio of the third transformer 6 is 6:1 to 15:1, and the core of the third transformer 6 has no air gap. The fourth capacitor 4 and the fifth capacitor 5 are connected in series and resonate with the secondary inductor of the third transformer 6 at 50Hz. The capacitance values ​​of the fourth capacitor 4 and the fifth capacitor 5 are equal, both ranging from 1000 to 5000 uF. The value of the secondary inductor of the third transformer 6 is calculated based on the 50Hz resonance relationship and the capacitance value. When a fault causes a 50Hz current in the rail to enter the track circuit signal transmission channel, a large current appears in the secondary inductor of the third transformer 6 due to the series resonance. Since the transformer core has no air gap, it is prone to core saturation under the influence of a large current. When the iron core is saturated, no signal can be transmitted through the transformer, causing the track circuit receiving system to fail to receive signals and triggering an alarm. Therefore, the transformer series resonance and iron core design can improve the protection against 50Hz high current. In addition, the sixth capacitor 7 and the first inductor 8 are in series resonance with the 50Hz second harmonic (100Hz); the seventh capacitor 9 and the second inductor 10 are in series resonance with the 50Hz third harmonic (150Hz), thus preventing the two higher-energy harmonics from interfering with the track circuit transmission channel.

[0061] Due to variations in rail condition and length, voltage parameters differ at the receiving system. To ensure reliable signal processing results, signal amplitude adjustment is necessary to maintain it within an appropriate range. For example... Figure 7 As shown, Figure 7 This is a schematic diagram of the transmission channel conditioning unit provided in an embodiment of this application. The transmission channel conditioning unit BJ adopts a bridge circuit structure, wherein the resistors R1, R2, and R3 are the same, approximately 1000 to 100000 kΩ; the resistance value at Rx is selected by connecting R4 to R10 according to the input voltage amplitude. The selection can be made by selecting a single resistance value, or the resistors can be connected in series before being connected to Rx.

[0062] In the embodiments provided in this application, the device includes a two-element unit and a three-element unit. The two-element unit includes a first capacitor and a first transformer, with the first capacitor connected in series with the primary side of the first transformer. The three-element unit includes a second capacitor, a third capacitor, and a second transformer, with the second capacitor connected in series with the primary side of the second transformer and the third capacitor connected in parallel with the primary side of the second transformer. Furthermore, the signal acquisition points for the track section are located at the two ends of the secondary side of the first transformer or the two ends of the secondary side of the second transformer. By including transformers in the two-element and three-element units, when the voltage across the primary-side inductor is too high, appropriate voltage reduction can be applied to facilitate signal transmission. The impedance reflected from the secondary side of the transformer to the primary side increases due to the increased turns ratio; this parallel connection with the primary-side inductor impedance ensures the stability of the primary-side inductor. Furthermore, setting the signal acquisition points at the two ends of the secondary side of the first or second transformer greatly enhances the voltage signal. This, in turn, improves the accuracy of track circuit detection.

[0063] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes said element.

[0064] It should also be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separate. The components indicated as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0065] The above description is merely one specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A track circuit detection device, characterized in that, include: The two-element unit includes a first capacitor and a first transformer; The first capacitor is connected in series with the primary side of the first transformer; The three-element unit includes a second capacitor, a third capacitor, and a second transformer; The second capacitor is connected in series with the primary side of the second transformer; The third capacitor is connected in parallel with the primary side of the second transformer; The signal acquisition points for the track section are set at both ends of the secondary side of the first transformer or at both ends of the secondary side of the second transformer.

2. The apparatus according to claim 1, characterized in that, The primary inductance of the first transformer is 75uH to 110uH; The turns ratio of the primary side to the secondary side of the first transformer is 2:1 to 10:

1.

3. The apparatus according to claim 1, characterized in that, The primary inductance of the second transformer is 75uH to 110uH; The turns ratio of the primary side of the second transformer to the secondary side of the first transformer is 2:1 to 10:

1.

4. The apparatus according to claim 1, characterized in that, The device further includes: Transmission channel anti-interference unit; The transmission channel anti-interference unit is located between the signal acquisition point and the receiver in the small track section.

5. The apparatus according to claim 4, characterized in that, The transmission channel anti-interference unit includes: The third transformer, the fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor, the first inductor, and the second inductor; The turns ratio of the primary side to the secondary side of the third transformer is 6:1 to 15:

1. The fourth capacitor and the fifth capacitor are connected in series and resonate in series with the secondary inductance of the third transformer at 50Hz. The fourth capacitor and the fifth capacitor have the same capacitance value; The capacitance values ​​of the fourth capacitor and the fifth capacitor are 1000~5000uF; The sixth capacitor and the first inductor are connected in parallel with the primary side of the third transformer; The sixth capacitor and the first inductor are 50Hz second harmonic; The seventh capacitor and the second inductor are connected in parallel with the primary side of the third transformer; The seventh capacitor and the second inductor are 50Hz third harmonic.

6. The apparatus according to claim 1, characterized in that, The device further includes: Small track signal amplitude conditioning unit; The small track signal amplitude conditioning unit is located between the signal acquisition point and the receiver in the small track section.

7. The apparatus according to claim 6, characterized in that, The small track signal amplitude conditioning unit includes: First resistor, second resistor, third resistor, and fourth resistor; The first resistor, the second resistor, the third resistor, and the fourth resistor constitute a bridge circuit structure; The first resistor, the second resistor, and the third resistor are equal; The resistance values ​​of the first resistor, the second resistor, and the third resistor are 1000 to 100000 kΩ; The resistance value of the fourth resistor is related to the input voltage amplitude.

8. The apparatus according to claim 4, characterized in that, The transmission channel anti-interference unit is located on the side of the small track section, close to the signal acquisition point, between the signal acquisition point and the receiver.

9. The apparatus according to claim 6, characterized in that, The small track signal amplitude conditioning unit is located on the side closer to the receiver, between the signal acquisition point and the receiver in the small track section.

10. The apparatus according to any one of claims 1-9, characterized in that, The device further includes: SVA hollow coil; the SVA hollow coil is connected in parallel with the two-element unit and the three-element unit.

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