One-way conduction device

Abstract

The utility model discloses a one-way conduction device which comprises an isolating switch, a thyristor group and a one-way conduction unit, the isolating switch is installed at two ends of an insulating joint in parallel, the thyristor group and the one-way conduction unit are both connected with the isolating switch in parallel, the thyristor group is also connected with the one-way conduction unit in parallel, and the thyristor group is electrically connected with a control module. And a Hall current sensor a and a fuse a are also connected to a branch where the thyristor group is located. The beneficial effects of the utility model are that the device is connected in parallel with the insulation joint of the steel rail, thereby reducing the electrocorrosion of the stray current of the protected section to the structure and the metal pipeline, reducing the steel rail potential of the parking garage and the maintenance garage, maintaining the safety of the maintenance personnel, and enabling the one-way conduction unit to be conducted in the forward direction and cut off in the reverse direction. Under the action of the thyristor group, the electric arc generated at the insulating joint of the steel rail of the train is ensured not to burn the steel rail under any condition.

Description

Technical Field

[0001] The utility model relates to the technical field of catenary power supply, in particular to a one-way conduction device. Background Art

[0002] The catenary of urban rail transit tram is divided into sections for power supply. Generally, the traction power supply system of urban rail transit tram is a DC overhead catenary power supply mode, using the rail as the channel for traction return current. The rail is directly installed on the integral roadbed and isolated by anti-vibration insulation pads and the structural steel bars of the roadbed. During operation, due to sewage, dust, metal powder, and ballast adsorbed on the anti-vibration insulation pads, the leakage impedance between the rail and the integral roadbed is reduced, and the return current in the rail flows into the integral roadbed through these polluted substances, generating stray current. The stray current uses the structural steel bars in the integral roadbed, tunnel, and viaduct of the subway as the path. When the stray current leaves the metal path, it will corrode the metal. If the anti-corrosion measures for stray current are not well done, it will corrode the structural steel bars of the subway. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a one-way conduction device.

[0004] The purpose of the utility model is realized by the following technical solutions: A one-way conduction device includes a disconnector, a thyristor group, and a one-way conduction unit. The disconnector is installed in parallel at both ends of the insulating joint, and both the thyristor group and the one-way conduction unit are connected in parallel with the disconnector. The thyristor group is also connected in parallel with the one-way conduction unit. The thyristor group is electrically connected to the control module, and a Hall current sensor a and a fuse a are also connected to the branch where the thyristor group is located.

[0005] Preferably, the one-way conduction unit includes a diode, a Hall current sensor b, and a fuse b. One end of the diode is connected to the A end of the insulating joint, the other end of the diode is connected to one end of the Hall current sensor b, the other end of the Hall current sensor b is connected to the fuse b, and the other end of the fuse b is connected to the B end of the insulating joint.

[0006] Preferably, it further includes a voltage sensor, and the voltage sensor is connected in parallel with the insulating joint.

[0007] Preferably, it further includes a varistor, and the varistor is connected in parallel with the insulating joint.

[0008] Preferably, it further includes a protection resistor and a protection capacitor. Both the protection resistor and the protection capacitor are connected in parallel with the insulating joint, and the protection resistor is connected in series with the protection capacitor.

[0009] Preferably, the thyristor group includes thyristor a and thyristor b. Thyristor a and thyristor b are connected in parallel, and the conduction directions of thyristor a and thyristor b are opposite. Both thyristor a and thyristor b are electrically connected to the control module.

[0010] The utility model has the following advantages: by connecting the device in parallel at the insulating joint of the rail, the utility model reduces the electrochemical corrosion of the structure and metal pipelines caused by stray current in the protected section, and at the same time reduces the rail potential of the parking garage and the maintenance garage, ensuring the safety of maintenance personnel. Moreover, the unidirectional conduction unit conducts in the forward direction and blocks in the reverse direction. Under the action of the thyristor group, it ensures that in any case, the arc generated at the rail insulating joint will not burn out the rail. Description of the Drawings

[0011] Figure 1 It is a schematic structural diagram of the internal circuit of the unidirectional conduction device;

[0012] In the figure, 1 - insulating joint, 2 - isolating switch, 3 - Hall current sensor a, 4 - fuse a, 5 - voltage sensor, 6 - thyristor group, 7 - unidirectional conduction unit, 8 - varistor, 9 - protection resistor, 10 - protection capacitor. Specific Embodiments

[0013] To make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of the embodiments. Usually, the components of the embodiments of the utility model described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0014] Therefore, the following detailed description of the embodiments of the utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents the selected embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the utility model.

[0015] It should be noted that, without conflict, the embodiments in the utility model and the features in the embodiments can be combined with each other.

[0016] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0017] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0018] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "coupled" 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, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0019] In this embodiment, as Figure 1As shown in the figure, a unidirectional conduction device includes a disconnecting switch 2, a thyristor group 6, and a unidirectional conduction unit 7. The disconnecting switch 2 is installed in parallel at both ends of the insulating joint 1, and both the thyristor group 6 and the unidirectional conduction unit 7 are connected in parallel with the disconnecting switch 2. The thyristor group 6 is also connected in parallel with the unidirectional conduction unit 7. The thyristor group 6 is electrically connected to the control module, and a Hall current sensor a3 and a fuse a4 are also connected to the branch where the thyristor group 6 is located. By connecting the device in parallel at the insulating joint 1 of the rail, the electrolytic corrosion of the structure and metal pipelines caused by stray current in the protected section is reduced. At the same time, the rail potential of the parking garage and the maintenance garage is lowered to ensure the safety of maintenance personnel. Moreover, the unidirectional conduction unit 7 conducts in the forward direction and cuts off in the reverse direction. Under the action of the thyristor group, it is ensured that the arc generated at the rail insulating joint 1 will not burn the rail under any circumstances of the train. Specifically, the model of the disconnecting switch 2 is 3000A single-pole, and its main function is to electrically connect the rails at both ends of the insulating joint 1 when the disconnecting switch 2 is closed under special operation modes. The model of the Hall current sensor a3 is WBI221QN05-P2D / ±2000A / ±5V / DC±12V, and its main function is to detect the current in the thyristor group in real time, so as to provide a basis for whether the thyristor group discharges; the model of the fuse a4 is DC3000A, and its main function is to protect the thyristor group from being broken down. In this embodiment, when on a general tunnel line, the positive pole of the unidirectional conduction device is connected to the above-ground rail of the vehicle depot, and the negative pole is connected to the underground main line rail. When the train runs on the underground main line, it is not allowed for the train current to flow back to the vehicle depot or the train depot. When the train departs from the depot in the morning, the train current can flow back to the traction substation through the unidirectional conduction device. When in the tunnel immersed tube section under the river, the positive pole of the unidirectional conduction device is connected to the underground rail of the tunnel immersed tube section, and the negative pole is connected to the rail outside the immersed tube section. When the train runs in the tunnel immersed tube section, the train current flows back to the traction substation through the unidirectional conduction device, and when the train runs in the section outside the tunnel immersed tube, the train current flows back to the traction substation through the return cable parallel to the rail.

[0020] Further, the unidirectional conduction unit 7 includes a diode, a Hall current sensor b, and a fuse b. One end of the diode is connected to the A end of the insulating joint 1, the other end of the diode is connected to one end of the Hall current sensor b, the other end of the Hall current sensor b is connected to the fuse b, and the other end of the fuse b is connected to the B end of the insulating joint 1. Specifically, there are five unidirectional conduction units 7. The model of the diode 12 is 3500A / 2000V, and its main function is to realize the unidirectional conduction of the traction power supply circuit. The model of the Hall current sensor b13 is WBI221QN05-P2D / ±1000A / ±5V / DC±12V, and its main function is to detect the current in the diode 12 in real time; the model of the fuse b14 is DC1000A, and its main function is to protect the diode 12 from being broken down.

[0021] In this embodiment, a voltage sensor 5 is further included, and the voltage sensor 5 is connected in parallel with the insulating joint 1. Specifically, the model of the voltage sensor 5 is WBV151S01 / ±200V / 5±5V / 24V, and its main function is to detect the circuit voltage in real time.

[0022] Furthermore, a varistor 8 is further included, and the varistor 8 is connected in parallel with the insulating joint 1. Specifically, the model of the varistor 8 is 1100V 5kA, and its main function is that when the voltage sensor 5 detects that the voltage between the A end and the B end exceeds 1100V, the varistor 8 conducts instantaneously, thereby protecting the diode and the thyristor group 6.

[0023] Still further, a protection resistor 9 and a protection capacitor 10 are further included. The protection resistor 9 and the protection capacitor 10 are both connected in parallel with the insulating joint 1, and the protection resistor 9 and the protection capacitor 10 are connected in series. Specifically, the model of the protection resistor 9 is 10Ω-25W, and the model of the protection capacitor 10 is 2500V / 0.47μf. The main functions of the two are to suppress the inrush current and protect the diode and the thyristor group 6. In this embodiment, the thyristor group 6 includes a thyristor a and a thyristor b. The thyristor a and the thyristor b are connected in parallel, and the conduction directions of the thyristor a and the thyristor b are opposite. The thyristor a and the thyristor b are both electrically connected to the control module. Specifically, the models of the thyristor a6 and the thyristor b7 are 3000A / 2000V, and their main function is to prevent an arc from being formed when the train passes through the insulating joint 1. That is, when the voltage reaches the arcing voltage, the thyristor conducts. That is to say, due to the inconsistent power supply and load conditions of the traction substations on both sides of the insulating joint 1, there may be a certain voltage difference at both ends of the insulating joint 1. If the train passes through the insulating joint 1, when the voltage difference and current on both sides of the insulating joint 1 reach a certain value, an arc will be formed. In order to prevent the arc from affecting the insulating joint 1 circuit, when the train passes through the insulating joint 1, the voltage sensor 5 detects the reverse voltage of the insulating joint 1. When the reverse voltage reaches the arcing voltage, the control module triggers the corresponding thyristor to conduct reversely. After the train passes through the insulating joint 1, the thyristor turns off and the device resumes normal operation.

[0024] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A unidirectional conduction device, characterized in that: It includes a disconnector (2), a thyristor bank (6) and a unidirectional conduction unit (7). The disconnector (2) is installed in parallel at both ends of the insulating joint (1), and both the thyristor bank (6) and the unidirectional conduction unit (7) are connected in parallel with the disconnector (2). The thyristor bank (6) is also connected in parallel with the unidirectional conduction unit (7). The thyristor bank (6) is electrically connected to a control module, and a Hall current sensor a (3) and a fuse a (4) are also connected to the branch where the thyristor bank (6) is located.

2. The unidirectional conduction device according to claim 1, wherein: The unidirectional conduction unit (7) includes a diode, a Hall current sensor b and a fuse b. One end of the diode is connected to the A end of the insulating joint (1), the other end of the diode is connected to one end of the Hall current sensor b, the other end of the Hall current sensor b is connected to the fuse b, and the other end of the fuse b is connected to the B end of the insulating joint (1).

3. The unidirectional conduction device according to claim 2, wherein: It further includes a voltage sensor (5) which is connected in parallel with the insulating joint (1).

4. The unidirectional conduction device according to claim 3, characterized in that: It further includes a varistor (8) which is connected in parallel with the insulating joint (1).

5. The unidirectional conduction device according to claim 4, characterized in that: It further includes a protection resistor (9) and a protection capacitor (10). Both the protection resistor (9) and the protection capacitor (10) are connected in parallel with the insulating joint (1), and the protection resistor (9) is connected in series with the protection capacitor (10).

6. The unidirectional conduction device according to claim 5, wherein: The thyristor bank (6) includes a thyristor a and a thyristor b. The thyristor a and the thyristor b are connected in parallel, and the conduction directions of the thyristor a and the thyristor b are opposite. Both the thyristor a and the thyristor b are electrically connected to the control module.

Images