WO2018082408A1

WO2018082408A1 - Traction return current apparatus

Info

Publication number: WO2018082408A1
Application number: PCT/CN2017/102673
Authority: WO
Inventors: 徐宗奇; 李智宇; 乔志超; 杨晓锋
Original assignee: 北京全路通信信号研究设计院集团有限公司
Priority date: 2016-11-03
Filing date: 2017-09-21
Publication date: 2018-05-11
Also published as: CN106335376A

Abstract

A traction return current device, comprising an inductor unit (11) and a capacitor unit (12). One end of the said inductor unit (11) is connected to a first rail, and the other end is connected to a second rail; one end of the capacitor unit (12) is connected to the first rail, and the other end is connected to the second rail; the inductor unit (11) is connected in parallel with the capacitor unit (12); the inductor unit (11) is an inductance coil, and the central point of the inductance coil is connected to the central point of adjacent sections or is grounded for conducting a traction current; the capacitor unit (12) comprises a first capacitor; the parallel circuit of the inductance coil and the first capacitor is used for implementing compensating to a track circuit. The traction return current device implements returns current and capacitance compensation functions by connecting the inductor unit (11) and the capacitor unit (12) in parallel and connecting same between the first rail and the second rail, and the traction return current device is small in size and light in weight, which bring great convenience to transportation, field installation, and maintenance processes.

Description

Traction reflow device

The present application claims priority to Chinese Patent Application Serial No. No. No. No. No. No. No. No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No

Technical field

The present invention relates to the field of electrified audio system and coded track circuit technology, and more particularly to a traction reflow device.

Background technique

In the existing electrified railways, the traction reflow devices of the track circuits in the sections and stations are various types of choke transformers, and the choke transformers are placed beside the rails, and are connected in parallel between the rails through the lead wires.

Among them, the track circuit refers to a circuit consisting of a rail line and a rail insulation for automatically and continuously detecting whether the line is occupied by the rolling stock and transmitting speed information to the locomotive to ensure driving safety. Traction reflow equipment refers to equipment used to provide traction current paths or to conduct traction currents to the path.

However, in the prior art, a choke transformer is used for traction current returning to the substation or grounding. In order not to affect the normal operation of the track circuit, the frequency shifting impedance of the choke transformer is required to be greater than 17 ohms. At present, various types of choke transformers are composed of copper wire and cast iron. In order to meet the requirements of traction recirculation and frequency shift impedance, the weight is above 100Kg, and the device size is large. And when a short-circuit fault occurs in the choke transformer, the signal voltage at the receiving end of the track circuit rises. In order to reduce the voltage rise of such a fault, the impedance of the choke transformer needs to be designed very high, and indirectly causes the device size to be very large. Big.

Summary of the invention

In order to solve the above problems, the present invention provides a traction return device, the traction return device It is small in size and has the function of compensating capacitors.

To achieve the above object, the present invention provides the following technical solutions:

A traction return device, the traction return device comprising:

Inductor unit and capacitor unit;

One end of the inductor unit is connected to the first rail, and the other end is connected to the second rail; one end of the capacitor unit is connected to the first rail, and the other end is connected to the second rail; the inductor unit and the capacitor Units in parallel;

The inductive unit is an inductive coil, and the center point of the inductive coil is connected to a center point of an adjacent section or grounded to conduct a traction current;

The capacitor unit includes: a first capacitor; the inductor and the first capacitor parallel circuit are used to implement a compensation function for the track circuit.

Preferably, in the traction reflow device, the inductor coil is a hollow inductor or a core inductor.

Preferably, in the above traction recirculation device, the inductance unit exhibits a low impedance to the train power source signal.

Preferably, in the above traction return device, the frequency of the train power signal is 50 Hz.

Preferably, in the traction reflow device, the capacitor unit further includes at least one second capacitor, and the at least one second capacitor is connected in parallel with the first capacitor.

Preferably, in the above-mentioned traction reflow device, the parallel circuit of the inductance unit and the capacitor unit is used for compensating the track circuit at a signal frequency of 1700 Hz to 2600 Hz.

Preferably, in the traction reflow device, the parallel circuit of the inductor unit and the capacitor unit is used for compensating the track circuit at a carrier frequency of signal frequencies of 1700 Hz, 2000 Hz, 2300 Hz, and 2600 Hz.

According to the above description, the present invention provides a traction reflow device comprising: an inductance unit and a capacitor unit; one end of the inductor unit is connected to the first rail, and the other end is connected to the second rail; wherein the inductor unit is The inductor coil, and the center point of the inductor coil is connected to the center point of the adjacent section or grounded to conduct the traction current. That is to say, when the current running the driving locomotive flows into the first rail and the second rail, due to the center point of the inductor coil and the center point of the adjacent section When connected or grounded, the current driving the locomotive flows into the adjacent section or the ground through the connection loop of the inductor and the first rail and the second rail, thereby realizing the traction recirculation. It can be seen that the traction reflow device only realizes the traction recirculation by connecting the inductor coil between the first rail and the second rail and grounding the center point of the inductor coil.

One end of the capacitor unit is connected to the first rail, and the other end is connected to the second rail; the inductor unit is connected in parallel with the capacitor unit; the capacitor unit includes: a first capacitor; the inductor coil and the first capacitor are connected in parallel for the pair The track circuit achieves compensation. That is to say, in the track circuit, the current transmission is weakened as the transmission length is weakened. Then, by connecting the capacitor between the first rail and the second rail, and the capacitor unit is connected in parallel with the inductor unit, the compensation of the track circuit is realized. The function can further increase the transmission length of the current. It can be seen that the traction reflow device also has the function of compensating for the track circuit under the premise of realizing the traction reflow effect.

Compared with the prior art, the traction reflow device is connected between the first rail and the second rail only by the parallel connection of the inductor unit and the capacitor unit, thereby realizing the function of traction recirculation and compensating capacitor, small size and light weight, and further Great convenience in transportation, on-site installation and maintenance.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can obtain other drawings according to the provided drawings without any creative work.

1 is a schematic structural view of a traction return device according to an embodiment of the present invention;

2(a) is a schematic diagram of a hollow inductor coil according to an embodiment of the present invention;

2(b) is a schematic diagram of an iron cored inductor coil according to an embodiment of the present invention;

3(a) is a schematic structural diagram of an inductor unit and a capacitor unit including a capacitor in parallel according to an embodiment of the present invention;

FIG. 3(b) is a schematic structural diagram of an inductor unit and a capacitor unit including two capacitors connected in parallel according to an embodiment of the present invention;

FIG. 3(c) shows an inductor unit and a capacitor single including four capacitors according to an embodiment of the present invention. Schematic diagram of the parallel connection of elements;

4 is a schematic structural view of another traction return device according to the present invention;

FIG. 5 is a schematic diagram of signal frequency response characteristics according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

It can be seen from the prior art that in the prior art, a choke transformer is used for traction current returning to the substation or grounding, but the weight of the choke transformer is above 100 Kg, and the size of the device is large, resulting in great transportation, on-site installation and maintenance. inconvenient.

In order to solve the above problems, an embodiment of the present invention provides a traction reflow device, and the traction reflow device includes:

Inductor unit and capacitor unit;

One end of the capacitor unit is connected to the first rail, the other end is connected to the second rail; the inductor unit is connected in parallel with the capacitor unit; the capacitor unit includes: a first capacitor; the inductor coil and the first capacitor are connected in parallel for the pair The track circuit achieves compensation. That is to say, in the track circuit, the current transmission is weakened as the transmission length is weakened. Then, by connecting the capacitor between the first rail and the second rail, and the capacitor unit is connected in parallel with the inductor unit, the compensation of the track circuit is realized. The function can further increase the transmission length of the current. It can be seen that the traction reflow device also has the function of compensating for the track circuit under the premise of realizing the traction reflow effect.

The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

Referring to FIG. 1, FIG. 1 is a schematic structural diagram of a traction reflow device according to an embodiment of the present invention.

The traction return device includes:

Inductor unit 11 and capacitor unit 12.

One end of the inductor unit 11 is connected to the first rail, and the other end is connected to the second rail; one end of the capacitor unit 12 is connected to the first rail, and the other end is connected to the second rail; the inductor unit 11 and The capacitor units 12 are connected in parallel.

The inductive unit 11 is an inductive coil, and the center point of the inductive coil is connected to a center point of an adjacent section or grounded to conduct a traction current.

That is to say, when the current running the driving locomotive flows into the first rail and the second rail, since the center point of the inductor coil is connected or grounded to the center point of the adjacent section, the current that drives the locomotive runs through the inductor coil and the first The connecting circuit of the rail and the second rail flows into the adjacent section or the ground, and the traction backflow is achieved.

Referring to FIG. 2(a), the inductor coil is a hollow inductor coil, and as shown in FIG. 2(b), the inductor coil is an iron core inductor.

Optionally, in the embodiment of the present invention, the inductor unit 11 adopts a hollow inductor, which can make the circuit more stable and has better linearity, and can better withstand the impact of the impact interference on the traction return device.

And the inductance unit 11 presents a low impedance to the train power supply signal, that is, the current draw can be realized to the greatest extent. The frequency of the train power signal is 50 Hz, and the train power source can be either an AC power source or a DC power source.

The capacitor unit 12 includes: a first capacitor; the inductor and the first capacitor parallel circuit are used to implement a compensation function for the track circuit.

That is to say, in the track circuit, the transmission of current is weakened as the transmission length is weakened, then by connecting the capacitor between the first rail and the second rail, and the capacitor unit 12 is connected in parallel with the inductor unit 11, the orbit is realized. The compensation of the circuit, in turn, can increase the length of the current transmission. The parallel circuit of the inductive unit 11 and the capacitor unit 12 exhibits a capacitance between a signal frequency of 1700 Hz and 2600 Hz. More specifically, the circuit of the inductive unit 11 and the capacitor unit 12 is at a signal frequency. The carrier frequencies of 1700 Hz, 2000 Hz, 2300 Hz and 2600 Hz are capacitive, which can compensate the track circuit.

It should be noted that the capacitor unit 12 further includes at least one second capacitor, and the at least one second capacitor is connected in parallel with the first capacitor. That is to say, according to the actual situation, how many capacitors need to be connected in parallel in the capacitor unit 12 to achieve compensation for the track circuit.

Referring to FIG. 3(a) to FIG. 3(c), respectively, a schematic structural view of an inductor unit in parallel with a capacitor unit is shown.

Optionally, in the embodiment of the present invention, as shown in FIG. 3( a ), the capacitor unit 12 includes a capacitor. As shown in FIG. 3( b ), the capacitor unit 12 includes two capacitors, two. The capacitors are connected in parallel, as shown in FIG. 3(c), the capacitor unit 12 includes four capacitors, and four capacitors are connected in parallel.

It should be noted that, referring to FIG. 4, FIG. 4 is a schematic structural diagram of another traction reflow device according to the present invention. As shown in FIG. 4, there are many circuit forms that can achieve the object of the present invention. Description will be made, and thus a device or circuit that achieves the object of the present invention by an inductive coil and a capacitor connection or the same principle is within the scope of the present invention.

In order to meet different track circuits and transmission rates, it is necessary to limit the inductance value of the inductor coil and the value of the capacitor in the capacitor unit.

Referring to FIG. 5, FIG. 5 is a schematic diagram of signal frequency response characteristics according to an embodiment of the present invention.

The inductance value of the inductor coil needs to be satisfied. Under the premise that the frequency of the train power supply signal f ₁ is 50 Hz, the impedance of the inductor coil is not greater than the maximum allowable impedance Z _{max of} the track circuit. The specific calculation formula is: 2πf ₁ L ≤ Z _max .

The selection of the value of the capacitance in the capacitor unit needs to be satisfied. Under the premise that the signal frequency f _{2 of} the track circuit section is 1700 Hz to 2600 Hz, the impedance is equivalent to the compensation capacitor C _com . The specific calculation formula is:

It can be seen from the above description that the traction reflow device is connected between the first rail and the second rail only by the parallel connection of the inductor unit and the capacitor unit, thereby realizing the function of traction recirculation and compensating capacitor, small size, light weight, and further Great convenience in transportation, on-site installation and maintenance.

The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but the scope of the invention is to be accorded

Claims

A traction reflow device, characterized in that the traction recirculation device comprises:

Inductor unit and capacitor unit;

One end of the inductor unit is connected to the first rail, and the other end is connected to the second rail; one end of the capacitor unit is connected to the first rail, and the other end is connected to the second rail; the inductor unit and the capacitor Units in parallel;

The inductive unit is an inductive coil, and the center point of the inductive coil is connected to a center point of an adjacent section or grounded to conduct a traction current;

The capacitor unit includes: a first capacitor; the inductor and the first capacitor parallel circuit are used to implement a compensation function for the track circuit.
The traction reflow device according to claim 1, wherein the inductor coil is a hollow inductor or a core inductor.
The traction return device of claim 1 wherein said inductive unit exhibits a low impedance to the train power supply signal.
The traction return device of claim 3 wherein said train power supply signal has a frequency of 50 Hz.
The traction reflow device according to claim 1, wherein the capacitor unit further comprises at least one second capacitor, and the at least one second capacitor is connected in parallel with the first capacitor.
The traction reflow device according to claim 1, wherein the parallel circuit of the inductance unit and the capacitor unit is used for compensating a track circuit at a signal frequency of 1700 Hz to 2600 Hz.
The traction reflow device according to claim 6, wherein the parallel circuit of the inductor unit and the capacitor unit is used to compensate a track circuit at a carrier frequency of signal frequencies of 1700 Hz, 2000 Hz, 2300 Hz, and 2600 Hz.