JP2820617B2 - 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.

[0002]

2. Description of the Related Art A conventional impedance bond has a primary upper coil and a primary lower coil through which a train current flows, and a secondary coil for obtaining a signal by electromagnetically coupling with a signal current.
When an unbalanced current occurs in the train current, magnetic saturation occurs,
The signal transmitted to orbit cannot be received. Therefore, a current detection coil is provided to detect an unbalanced current of the train current. An impedance bond having such a current detection coil is disclosed, for example, in Japanese Utility Model Laid-Open No. 2-129964.

Since the impedance bond disclosed in Japanese Utility Model Laid-Open No. 2-129964 is for a DC electrification section, a current detection coil constitutes a magnetic amplifier. The current detection coil and the primary coil and the secondary coil are provided separately. The current detection coil has two magnetic cores, and is connected so that the train current passes through the two magnetic cores in opposite directions. An extension connected to the primary upper coil and the primary lower coil is provided, and a reverse train current is obtained by wiring of the extension. For AC electrified sections,
The current detection coil is configured by a current transformer instead of the magnetic amplifier.

[0004]

However, the following points have not been solved in the conventional impedance bond. (A) Since the current detection coil and the primary coil are provided separately, it is necessary to connect the current detection coil and the primary coil. The connecting portion has a large contact area in order to keep the contact resistance low, and also requires many fastening bolts. For this reason, the external shape becomes large, the contact resistance of the connection part becomes large, and the calorific value increases. As a result, a heat radiating means as disclosed in JP-A-4-370911 is indispensable. Further, since a large vibration is applied when passing through the train, an increase in the contact resistance due to the loosening of the fastening bolt causes an increase in the amount of heat generation. (B) To obtain train currents in opposite directions, an extension connected to the primary coil is required. Since the train current is large, the calorific value of the extension also becomes a problem. (C) Since the current detection coil is provided separately,
It has become expensive.

[0005] Therefore, an object of the present invention is to provide a low-cost impedance bond by integrating a current detection coil into a primary coil to reduce the size and weight.

Another object of the present invention is to provide an impedance bond which can reduce the amount of heat generated by reducing the number of connection portions, and can be reduced in size and weight.

[0007]

In order to solve the above-mentioned problems, an impedance bond according to the present invention comprises a first magnetic core, a second magnetic core, a primary coil, a secondary coil, and a current detecting coil. Wherein the first magnetic core and the second magnetic core constitute independent magnetic paths, and the primary coil and the secondary coil are electromagnetically coupled via the first magnetic core. The primary coil includes a first coil and a second coil, and each of the first coil and the second coil is connected to a common connection terminal and a track connection. Terminal, and are wound around the first magnetic core so as to generate magnetic fluxes in mutually opposite directions according to a current flowing into the common connection terminal or a current flowing out from the common connection terminal, A first coil and the second coil At least the turn of the windings of said current detecting coil are electromagnetically coupled through said second magnetic core.

In a preferred example, the winding of at least one turn is provided on the outer peripheral side.

[0009]

The primary coil and the secondary coil are electromagnetically coupled via the first magnetic core. The first coil and the second coil have a common connection terminal commonly connected, a track connection terminal connected to each track, and respond to a current flowing into or flowing out of the common connection terminal. The first magnetic core is wound so as to generate magnetic fluxes in opposite directions. When the impedance bond is provided on the power receiving side of the track circuit, the train current flows from the track into the common connection terminal. When the impedance bond is provided on the power transmission side of the track circuit, the train current flows out of the common connection terminal into the track. For this reason, in the first magnetic core, the magnetic flux for the train current flowing in each track in the same direction is offset, and a magnetic flux corresponding to the signal current flowing in the track circuit is generated. Therefore, when the impedance bond is provided on the power receiving side, the secondary coil can receive the transmission signal transmitted to the track circuit based on the signal current flowing through the primary coil. When the impedance bond is provided on the power transmission side, the primary coil can transmit a transmission signal to the track circuit based on the signal current flowing through the secondary coil.

The first magnetic core and the second magnetic core constitute independent magnetic paths. The winding of at least one turn of the first coil and the second coil, and the current detecting coil
Electromagnetically coupled through the magnetic core. Therefore, regarding the second magnetic core, a current transformer having at least one turn of the first coil and at least one turn of the second coil as an input winding and a current detection coil as an output winding is provided. It is formed. The current transformer forms a current sensor. Accordingly, a magnetic flux corresponding to the unbalanced current of the train current is generated in the second magnetic core, and a current detection signal corresponding to the unbalanced current of the train current is obtained in the current detection coil. As a result, the current detection coil is integrated with the primary coil,
It is possible to reduce the size and weight and obtain an inexpensive impedance bond.

Furthermore, since the input winding of the current transformer is integrated with the primary coil, a connecting portion for connecting the primary coil and the current transformer becomes unnecessary, and the wiring distance between the primary coil and the current transformer is reduced. Since the heat generation decreases, the calorific value decreases. For this reason, by reducing the number of connection portions and the like, the amount of heat generated can be reduced, and the size and weight of the impedance bond can be reduced.

[0012]

1 is a circuit diagram of an impedance bond according to the present invention, FIG. 2 is an exploded perspective view of the impedance bond according to the present invention, FIG. 3 is a cross-sectional view taken along line A3-A3 in FIG. 2, and FIG. FIG. There are two types of impedance bonds, those provided on the power transmission point side of the track circuit and those provided on the power receiving side of the track circuit. Since both configurations are the same, the description will be limited to those provided on the power transmission side. The impedance bond according to the present invention has the first
, A second magnetic core 2, a primary coil 3, a secondary coil 4, and a current detection coil 5.

The first magnetic core 1 and the second magnetic core 2 form independent magnetic paths. The first magnetic core 1 is a sheet core for facilitating assembly work. Second magnetic core 2
Has become a cut core. The primary coil 3 includes a first coil 31 and a second coil 32. First
The coil 31 and the second coil 32 are wound several turns, respectively. The first coil 31 has a common connection terminal 313 and a track connection terminal 314. Second
Has a common connection terminal 323 and a track connection terminal 324. The common connection terminal 313 and the common connection terminal 323 are commonly connected, and a train current (I ₁ + I ₂ ) is supplied from an adjacent track circuit. The track connection terminal 314 is connected to one track of the track circuit. The track connection terminal 324 is connected to the other track of the track circuit. The first coil 31 and the second coil 32 are connected to the train current I ₁ flowing from the common connection terminal 313 to the track connection terminal 314, and the common connection terminal 323.
It is wound on the first magnetic core 1 so as to generate a reverse magnetic flux .phi.11, .phi.12 each other in response to the train current I ₂ flowing through the track connection terminal 324 from. Terminals 41 and 42 receive a transmission signal. The secondary coil 4 is wound around the first magnetic core 1 and transmits a transmission signal according to the signal current Is.

At least one turn of the windings 311, 321 of the first coil 31 and the second coil 32 and the current detecting coil 5 are electromagnetically coupled via the second magnetic core 2. Specifically, the first coil 31 and the second coil 3
2 has at least one turn of the windings 311 and 321 in the direction opposite to each other according to the train currents I ₁ and I _2.
Is wound around the second magnetic core 2. The current detection coil 5 is wound around the second magnetic core 2. Terminal 5
Reference numerals 1 and 52 are terminals for outputting a current detection signal corresponding to the unbalanced current (I ₁ −I ₂ ). The dotted line portion of the second core 2 indicates that the second core 2 has at least one turn of the winding 31.
1, 321 and the first coil 31
And the magnetic flux of the remaining windings 312 and 322 of the second coil 32 is not magnetically coupled. The current detection coil 5 is integrally formed from the viewpoint of reducing the number of connection parts.

As described above, the primary coil 3 and the secondary coil 4 are electromagnetically coupled via the first magnetic core 1. The first coil 31 and the second coil 32 have the common connection terminals 313 and 323 connected in common, and the track connection terminal 31
4 and 324 are connected to the respective tracks, and the train current I flowing from the common connection terminal 313 to the track connection terminal 314
_1, the magnetic flux of the opposite directions in response to the train current I ₂ flows from the common connection terminal 323 to track connection terminal 324 .phi.1
1, the first magnetic core 1 is wound so as to generate φ12. Therefore, in the first magnetic core 1, magnetic fluxes corresponding to the train currents I ₁ and I ₂ flowing in the respective tracks in the same direction are canceled out, and a magnetic flux corresponding to the signal current Is flowing in the track circuit is generated. The value of the magnetic flux due to the unbalanced current (I ₁ −I ₂ ) is determined so that the first magnetic core 1 is not magnetically saturated.
Therefore, a voltage corresponding to the turns ratio between the primary coil 3 and the secondary coil 4 is generated in the primary coil 3 based on the signal current Is flowing through the secondary coil 4, and a transmission signal can be sent to the track circuit.

The first magnetic core 1 and the second magnetic core 2 constitute independent magnetic paths. At least one turn of the windings 311, 321 of the first coil 31 and the second coil 32
Is a magnetic flux φ2 opposite to each other according to the train currents I ₁ and I _2.
1, which is wound around the second magnetic core so as to generate φ22. The current detection coil 5 is wound around the second magnetic core 2. Therefore, with respect to the second magnetic core 2, at least one turn of the winding 311 and at least one turn of the winding 321
Is used as an input winding, and a current transformer is formed using the current detection coil 5 as an output winding. The current transformer forms a current sensor. Accordingly, a magnetic flux (φ21−φ22) corresponding to the unbalanced current (I ₁ −I ₂ ) of the train current is generated in the second magnetic core 2, and the unbalanced current (the train current) of the train current is generated in the current detection coil 5. A current detection signal corresponding to I ₁ -I ₂ ) is obtained. As a result, the current detection coil 5 is integrated with the primary coil 3, so that the size and weight can be reduced, and an inexpensive impedance bond can be obtained.

Further, since the input winding of the current transformer is integrated with the primary coil 3, a connecting portion for connecting the primary coil 3 and the current transformer becomes unnecessary, and furthermore, the connection between the primary coil 3 and the current transformer is eliminated. Since the wiring distance is also reduced, the calorific value is reduced. For this reason, by reducing the number of connection portions and the like, the amount of heat generated can be reduced, and the size and weight of the impedance bond can be reduced.

In the embodiment, at least one turn of the winding 3
11, 321 are provided on the outer peripheral side. In this example,
The distance between the first magnetic core 1 and the second magnetic core 2 is the longest, and both can be magnetically separated. Therefore, the first magnetic core 1 and the second magnetic core 2 can form independent magnetic paths. Further, the first coil 31 and the remaining coils 312 and 322 of the first coil 31 and the second coil 32 excluding at least one turn of the windings 311 and 321 are wound around the first core 31 and the second core 2. Can be configured by winding at least one turn of the windings 311 and 321, so that the size can be reduced to about half of the conventional size and the assembling work is also facilitated. Further, the first coil 31
In addition, since the winding length of the second coil 32 is also minimized, the amount of generated heat can be reduced.

Further, in the embodiment, the first coil 31 and the second coil 32 are oppositely wound. First coil 3
Reference numeral 1 denotes a left-handed winding with the common connection terminal 313 being started.
The second coil 32 is right-handed with the common connection terminal 323 being started to be wound. In this example, the common connection terminals 313, 3
When the reference numerals 23 are connected in common, it is possible to generate a magnetic flux in the opposite direction to the train currents I ₁ and I _{2 in the} same direction, and generate a magnetic flux in the same direction to the signal current Is. For this reason,
The transmission signal can be easily transmitted from the secondary coil 4 by canceling the train current, and the unbalanced current (I ₁ -I ₂ ) of the train current can be easily detected from the current detection coil 5.

As described above, since the amount of heat generated at the connection portion and the wiring can be reduced, it is possible to reduce the size and oillessness.

[0021]

As described above, according to the present invention, the following effects can be obtained. (A) By integrating the current detection coil into the primary coil, miniaturization and weight reduction can be achieved, and an inexpensive impedance bond can be provided. (B) By reducing the number of connections, the amount of heat generated is reduced,
An impedance bond that can be reduced in size and weight can be provided.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an impedance bond according to the present invention.

FIG. 2 is an exploded perspective view of the impedance bond according to the present invention.

FIG. 3 is a sectional view taken on line A3-A3 of FIG. 2;

FIG. 4 is a plan view of an impedance bond according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st magnetic core 2 2nd magnetic core 3 Primary coil 31 1st coil 32 2nd coil 311 1-turn winding of the 1st coil 321 1-turn winding of the 2nd coil 4 Secondary coil 5 Current detection coil

Claims (2)

(57) [Claims] 1. An impedance bond including a first magnetic core, a second magnetic core, a primary coil, a secondary coil, and a current detecting coil, wherein the first magnetic core and the second magnetic core are The primary coil and the secondary coil are electromagnetically coupled via the first magnetic core, and the primary coil is connected to the first coil and the second coil. And each of the first coil and the second coil includes:
A common connection terminal that is connected in common, and a track connection terminal, so as to generate magnetic fluxes in opposite directions according to a current flowing into the common connection terminal or a current flowing from the common connection terminal. Wound around the first magnetic core, at least one of the first coil and the second coil
An impedance bond in which a turn winding and the current detection coil are electromagnetically coupled via the second magnetic core. 2. The impedance bond according to claim 1, wherein the at least one turn of the winding is provided on an outer peripheral side.