JP2850114B2 - Impedance bond - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impedance bond provided at a boundary of a track circuit, and more particularly to an impedance bond having a tertiary coil.

[0002]

2. Description of the Related Art Generally, an impedance bond is formed as shown in FIG.
As shown in, provided at a boundary of the double rail gauge track circuit electrified section has a function for distributing the train current I _1, I ₂ (return current) and the signal current i _s flowing to the rail. The signal current i _s, it is necessary not to flow to the other track circuit flows only one track circuit, whereas, the train current I
_1, I ₂ is, it must go flow to the substation and transmitted the rail. Thus, although not flow signal current i _s is the adjacent track circuit, train current I _1, I ₂ is the impedance bond used for electrical connection of flow.

As shown in FIG. 9, a conventional impedance bond is formed by winding a primary coil 1, a secondary coil 2 and a tertiary coil 3 around a laminated iron core C, for example. The primary coil 1, two coils 1a, divided into 1b, train current I _1, flow superimposes the I ₂ and the signal current i _s, the magnetic flux generated by a train current I _1, I ₂ flowing in each coil from each other It is arranged to be canceled. Secondary coil 2, the primary coil 1a, is inserted between the 1b and coupling the signal current i _s. The tertiary coil 3 is arranged adjacent to the primary and secondary coils, and has the same function as the secondary coil 2. The turns ratio of each coil is generally 1: 2
Next: third order = 1: 1: 20, etc.

In the above conventional impedance bond, 1
The magnetic flux created by the signal current i _s flowing to the next coil 1, 2
A signal voltage is generated in the secondary coil 2, and a signal voltage corresponding to the number of turns is induced in the tertiary coil 3, similarly to the secondary coil 2.
On the other hand, since the magnetic fluxes respectively generated by the train currents I ₁ and I ₂ flowing through the primary coil 1 cancel each other out, the train current becomes I
₁ = The I ₂ if the train current and the signal current is separated without interfering with each other.

[0005]

However, in the conventional impedance bond, as a tertiary coil 3 having a larger number of turns than the primary and secondary coils, as shown in a sectional view of the tertiary coil 3 in FIG. A concentrated winding coil in which one copper wire 50 is folded and overlapped and wound to form a multilayer is used. In the concentrated winding tertiary coil 3, a potential difference occurs between the conductors of each layer, a distributed capacitance occurs, and parallel resonance occurs.
For this reason, for example, when an impedance bond is installed close to a railroad crossing controller, the railroad crossing controller is generally used at a frequency of 8.5 to 40 kHz, whereas the parallel resonance of the tertiary coil causes a There is a problem that the primary impedance (impedance of the primary coil) around 4040 kHz becomes low, and the railroad crossing controller may malfunction.

[0006] Due to the parallel resonance of the tertiary coil, 1
As a countermeasure to reduce the influence of the lowering of the secondary impedance, for example, a method of increasing the primary impedance in a frequency range where the lowering of the impedance is problematic by connecting a compensating reactor to the tertiary coil and shifting the resonance frequency is considered. Can be However, the method of connecting the compensating reactor has disadvantages in that the number of components increases and the cost increases, and it is difficult to reduce the size.

The present invention has been made in view of the above points, and an object of the present invention is to reduce the distributed capacitance generated in a tertiary coil and to provide an impedance bond having a simple configuration that does not require a compensation reactor. I do.

[0008]

According to the first aspect of the present invention, a train current and a signal current flowing through a track circuit are superimposed and input, and a magnetic flux generated by the train current is canceled. A secondary coil that generates an induced electromotive force by a magnetic flux generated in the primary coil by the signal current, and a tertiary coil having a larger number of turns than the secondary coil. The tertiary coil has a plurality of tertiary coils wound in the same direction and number of turns in an impedance bond in which the train current flows to an adjacent track circuit and the signal current is separated from the train current without flowing to the adjacent track circuit. , And the winding start ends of the conductive wires of the respective layers are connected to each other, and the winding end ends of the conductive wires of the respective layers are connected to each other.

According to this configuration, the magnetic flux generated by the signal current flowing through the primary coil generates an induced electromotive force in the secondary coil and the tertiary coil, and the train current and the signal current flowing through the track circuit interfere with each other. Separated without having to. At this time, since a substantially equal signal voltage is induced between the conductors of each layer of the tertiary coil, a potential difference hardly occurs between the conductors, and the distributed capacitance of the tertiary coil is reduced to the distributed capacitance of the concentrated tertiary coil. Smaller than. As a result, the parallel resonance frequency shifts, and a decrease in the primary impedance around 30 to 40 kHz is suppressed.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing a main structure of the impedance bond according to the present embodiment. However, the same components as those of the above-described conventional impedance bond are denoted by the same reference numerals.

In FIG. 2, the present impedance bond includes a pair of iron cores 4a, 4b and primary coils 1, secondary coils 2, 3 provided in recesses of the iron cores 4a, 4b.
A secondary coil 3 and a case (not shown) for accommodating these iron cores and coils are provided. The impedance bond is oil-cooled by injecting insulating oil or the like into the case according to the need for cooling.

Each of the cores 4a, 4b is, for example, a stratified core having a substantially E-shaped cross section.
b is an iron core (EE core) in which the two concave portions are joined to face each other. The shape of the iron core is not limited to this. For example, an iron core (EI core) used in the conventional impedance bond shown in FIG. 9 may be used.

The primary coil 1 is similar to the primary coil used for a conventional impedance bond, and includes a train current I
_1, flow superimposes the I ₂ and the signal current i _s, the primary coil 1a, the magnetic flux generated by a train current I _1, I ₂ flowing in 1b is arranged to be canceled each other. As the conductor of each of the primary coils 1a and 1b, for example, a rectangular copper plate or the like is used.

The secondary coil 2 is the same as a secondary coil used for a conventional impedance bond. For example, a coil formed by using a flat copper wire or the like and having the same number of turns as the primary coils 1a + 1b. Is the primary coil 1a, 1
b. The primary coil 1a, the magnetic flux created by the signal current i _s flowing to 1b, the signal voltage e ₂ in the secondary coil 2 is induced.

The tertiary coil 3 is disposed adjacent to the primary coils 1a, 1b and the secondary coil 2, and like the secondary coil 2, a signal current i flowing through the primary coils 1a, 1b.
_The signal voltage e ₃ is induced by electromagnetic coupling with _s . Where 3
The structure of the next coil 3 will be described in detail. FIG.
FIG. 4 shows a top view of the tertiary coil 3 alone.
FIG. FIG. 1 shows an AA cross section of the tertiary coil 3 of FIG.

In the figure, a tertiary coil 3 is formed, for example, by winding six conductive wires 30a to 30f using a polyester copper wire or the like in six layers around a winding frame (not shown) or the like to form a substantially rectangular coil. . The winding method of this coil is 1
One layer is formed, and the conductors 30a to 30f of each layer are wound in the same direction and the number of turns indicated by the arrow in FIG. Insulating paper 31 and the like are inserted between the layers, and the outer peripheral portion of the coil formed by the six conductive wires 30a to 30f is covered with cloth tape 33 and the like via the film processed paper 32 and the like. Turns of each conductor 30a~30f start portion 30a ₁ ~30f ₁ and the winding end portion 30a ₂
30f ₂ are respectively drawn out as a terminal portion 34 and a terminal portion 35 by integrating six of them. As shown in the enlarged view of FIG. 5, the terminal portion 34 has, for example, one end of a lead wire 34b covered with a nylon varnish tube 34a or the like connected to a winding start end portion 30A in which each conductor is integrated. Here, two lead wires 34b are drawn out from the winding start end portion 30A of the conductive wire (FIG. 3). In the terminal portion 35, similarly to the terminal portion 34, one ends of two lead wires are connected to a winding end portion 30B in which respective conductors are integrated. The structure of the terminal portions 34 and 35 is not limited to this.

The turns ratio of each coil is, for example, primary: 2 to the total number of turns of the primary coils 1a and 1b.
Next: Third order = 1: 1: 20, etc. Further, as shown in the circuit diagram of FIG. 6, the connection of the impedance bond to the track circuit is performed by connecting the neutral point n connecting one end of the primary coil 1a and one end of the primary coil 1b to the adjacent track circuit. And the other end of the primary coil 1a is connected to one rail, and the other end of the primary coil 1b is connected to the other rail. Is done. Terminal portions of the secondary coil 2 and terminal portions 34 and 35 of the tertiary coil 3 are connected to a track relay via a not-shown relay transformer, track resistor, and phase adjuster, respectively.

Next, the operation of this embodiment will be described. When in the track circuit present impedance bonds is installed there is no train, the signal current i _s as shown in broken line arrows in FIG. 6 flows in the track circuit. In addition, the primary coils 1a, 1a
b the neutral point n to input train current I ₁ + I ₂ is, the train current I ₁ + I ₂ is the primary coil 1a, is divided and 1b on the train current I _1, I ₂ indicated by the solid line arrow in FIG. 6 Flows.

At this time, the signal flowing through the primary coils 1a and 1b
Signal current i_sThe magnetic flux created by the secondary coil 2 and the tertiary coil
3 to signal voltage e_Two, E_ThreeIs induced. On the other hand, the train current I
₁, I_TwoThe magnetic flux generated by
The train current I₁, I_TwoIs not induced.
Thereby, the signal current i_sAnd train current I₁, I_TwoWhat is
Separated by impedance bonds without interfering with each other
And induced signal voltage e _Two, E_ThreeBy secondary carp
Orbit relay connected to each terminal of coil 2 and tertiary coil 3
Operates, and the train current I₁, I_TwoHas both rails
It travels to the substation.

[0020] Here, focusing on the operation of the tertiary coil 3, by the magnetic flux primary coil 1a, the signal current i _s flowing 1b make substantially turns ratio across the conductors 30a~30f of the tertiary coil layers Induced electromotive force is generated. Winding start portion 30a ₁ ~30f ₁ and the winding end portion 30a of each lead
_{2 ~30f 2,} because they are connected to each other, rather than a potential difference occurs between the conductors of each layer as in the conventional concentrated winding tertiary coil, the voltage of each end of each wire is substantially equal. Accordingly, the distributed capacitance generated in the tertiary coil 3 is reduced as compared with the related art, and the parallel resonance frequency of the tertiary coil shifts to a higher frequency. As a result, the primary impedance of the impedance bond changes to the larger one.

FIG. 7 shows an example of a comparison between the conventional impedance bond (without a compensating reactor in the tertiary coil) and the impedance bond of the present embodiment with respect to the primary impedance characteristic with respect to the frequency. From the figure,
It can be seen that the present impedance bond has a higher primary impedance around 30 to 40 kHz than the conventional impedance bond.

As described above, according to the present embodiment, by using the above-described tertiary coil 3 for impedance bonding, the distributed capacitance in the tertiary coil is reduced, the parallel resonance frequency is shifted, and the Since the primary impedance increases, for example, even when an impedance bond is installed close to a railroad crossing controller or the like, there is no need to connect a compensation reactor to the tertiary coil as in the related art. Therefore, it is possible to provide a small impedance bond with a simple configuration at a low cost.

In the above-described embodiment, an impedance bond having a tertiary coil has been described. However, for example, an impedance bond having a larger number of turns of the secondary coil than the primary coil and having no tertiary coil is used. However, it is clear that the present invention can be applied. In this case, the same effect can be obtained by configuring the secondary coil with the same winding method as the tertiary coil of the present embodiment.

[0024]

As described above, according to the present invention, the winding start ends are connected to each other in a plurality of layers in which the conductors are wound in the same direction and the number of turns, and the winding end ends of the conductors are connected. By using a tertiary coil whose parts are connected to each other as an impedance bond, the distributed capacitance of the tertiary coil can be reduced and the parallel resonance frequency of the tertiary coil can be shifted, so that a decrease in impedance due to parallel resonance is a problem. It is possible to increase the primary impedance in a certain frequency range. Therefore, there is no need to connect a compensating reactor to the tertiary coil, and a small-sized impedance bond with a simple configuration can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a diagram showing a cross section of a tertiary coil used for an impedance bond according to an embodiment of the present invention.

FIG. 2 is a diagram showing a main structure of an impedance bond according to the embodiment;

FIG. 3 is a top view of the tertiary coil alone according to the embodiment;

FIG. 4 is a side view of the tertiary coil alone according to the embodiment;

FIG. 5 is an enlarged view of a terminal portion of the tertiary coil according to the embodiment.

FIG. 6 is a circuit diagram of an impedance bond according to the first embodiment.

FIG. 7 is a diagram showing a primary impedance characteristic with respect to the frequency of the impedance bond of the embodiment.

FIG. 8 is a diagram showing a configuration of a track circuit provided with impedance bonds;

FIG. 9 is a diagram showing a main structure of a conventional impedance bond.

FIG. 10 is a diagram showing a cross section of a tertiary coil used for a conventional impedance bond.

[Explanation of symbols]

1a, 1b 1 primary coil 2 the secondary coil 3 tertiary coil 4a, 4b core 30a~30f conductor 30A winding start end portion 30B winding completion end portion 34, 35 the terminal unit I _1, I ₂ train current i _s the signal current e ₂ , E ₃ signal voltage

Claims (1)

(57) [Claims] 1. A primary coil arranged so that a train current and a signal current flowing through a track circuit are superimposed and input to cancel a magnetic flux generated by the train current, and a primary coil generated by the signal current in the primary coil. And a tertiary coil having a larger number of turns than the secondary coil, wherein the train current flows to an adjacent track circuit, and the signal current flows to an adjacent track circuit. In an impedance bond that separates from the train current without flowing, the tertiary coil includes a plurality of layers in which the conductor is wound in the same direction and the number of turns, and connects the winding start ends of the conductors in each layer to each other; and An impedance bond, wherein the winding ends of the conductive wires of the respective layers are connected to each other.