JPS5831732Y2 - Power receiving device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a track circuit used for train detection in a railway signal safety system, and particularly to a power receiving device for a track circuit using an audio frequency.

Track circuits that utilize audio frequencies (hereinafter referred to as AF) have conventionally been used as a means for detecting trains running on tracks in predetermined block sections.

In Fig. 1, RL is a rail, TN is a train, T is an AF transmitter, R1 is an AF receiver with a loop coil 11 separated from the AF transmitter T by a distance of Sl, and R2 is an AF transmitter T.
AF with loop coil 12 separated by S2 distance from
In the receiver, ZB is the short circuit impedance and R2 is the rail insulation.

In FIG. 1, the AF transmission current i transmitted from the AF transmitter T flows in the direction of the arrow through the short circuit impedance ZB, and an induced voltage is generated in the loop coils /1 and 12.
The AF receivers R, 4, and R2 are operated, and a track relay (not shown) connected to these receivers is energized.

When train TN moves to the right and enters section S1, AF
Most of the transmission current i flows to the axle of the train TN, the loop coils I and 12 do not generate any induced voltage, the AF receivers R1 and R2 do not operate, and therefore the track loop is not excited. It is detected that train TN has entered the S□ section.

When the train TN further advances and the tail end of the train TN has passed the loop coil 11, an AF transmission current i flows through the rail parallel to the loop coil 11, activating the AF receiver R1, and the track relay is also energized, causing the train to pass through the loop coil 11. It is detected that TN has finished passing through the section of Sl.

When the train TN further advances and passes through the loop coil 12, an AF transmission current i is applied to the rail parallel to the loop coil 12.
flows, the AF receiver R2 operates, the track relay is also energized, and it is detected that the train TN has finished passing through the section S2.

In this way, the loop coil linked to the magnetic field generated by the AF transmission current i and the power receiver Rec shown in Fig. 2 are connected to the rail R.
Since there is almost no effect on the AF transmission current i flowing through L, the loop coil is set at 11°12... as shown in Figure 1.
..., it is possible to receive multiple power supplies with one AF transmitter, making it an extremely effective power receiving device for use in railroad crossing control.

In addition, after the last train passes the power receiving point, the induced voltage returns within a relatively short distance, resulting in good resolution.

However, with the recent modernization of railway vehicles, thyristor chopper devices have been introduced into drive control devices for electric vehicles.

Thyristor choppers, by their nature, repeatedly turn large currents on and off, and therefore often emit intense pulsed noise electromagnetic fields from the thyristor chopper's electrical circuit and peripheral equipment.

In particular, due to the structure of electric cars, the thyristor chopper device is often installed under the floor of the car, and is very close to the tracks.

Therefore, the component of the pulsed noise electromagnetic field (hereinafter referred to as noise electromagnetic field) emitted by the thyristor chopper device that is present on the rail surface is directly interlinked with the loop coil and power receiver of the AF track circuit, and the noise electromagnetic field of the thyristor chopper device is There is a danger that the harmonics of will mix into the signal wave of the receiver of the AF track circuit and cause the receiver to malfunction.

As mentioned above, conventional power receiving devices such as loop coils and power receivers that obtain induced voltage using the AF electromagnetic field generated by the AF transmission current i are likely to receive the noise electromagnetic field emitted by the thyristor chopper device at the same time. Therefore, there has been a demand for a solution to the above-mentioned problems that have arisen.

The present invention solves the above-mentioned problems, and does not use a power receiving device that interlinks and detects the electromagnetic field generated by the AF transmitting current, but mainly detects the rail voltage drop due to the AF transmitting current, thereby creating a thyristor chopper. An object of the present invention is to provide a power receiving device for AF transmission current that has a structure that reduces the influence of a noise electromagnetic field radiated by the device and is less susceptible to the influence of the noise electromagnetic field.

Embodiments of the present invention will be described in detail below based on the drawings.

Figure 3 shows an embodiment of the present invention, in which insulated conductive wires (hereinafter referred to as attachment wires) connected to both sides of rail RL at 41 points at the receiving end of AF transmission current i are extended to approximately the center of Pl and 14 points. Then, pull out the auxiliary wire on the outside of the rail to the inside of the rail, connect it to the auxiliary wire on the inside of the rail at 22 points, and pull out the power receiving wire, and connect the insulated conductor wire (hereinafter referred to as the auxiliary wire) connected to both sides of rail RL1 at point P4 to P1. Then, extend it to approximately the center of the 14 points, pull out the extension wire on the outside of the rail to the inside of the rail, connect it at 43 points, and pull out the power receiving line.

Next, add the exact same extension lines as installed on rail RL1 to rail RL2 from P'l and P'4 points to P'l and P'
The four points extend to the center of the coast and connect to the connection points P'2 and P, respectively.
'Pull out the power line at 3 points.

In addition, the extension line W is attached to the side surface of the rail as shown in the cross-sectional view of the rail.

The power receiving wires drawn out from the connection points P2 and 43 are connected to the primary side of the transformer T1, and the power receiving wires drawn out from the connection points P'2 and P'3 are connected to the primary side of the transformer T2. and the secondary side of the transformer T2 are connected to the harmonic.

By installing the equipment in this way, between the 41st point and P4 point of rail RL1, and between the P'1 point and P
'The induced voltage E due to the voltage drop due to the AF transmission current i generated between the four points of the rail L and the side effect is twice the induced voltage E on the secondary side of the transformer as in the case of one-sided rail power reception.

This is generated and becomes the input to the AF receiver.

Next, the effects produced by installing the device as in the present invention will be explained in detail with reference to FIG.

FIG. 4 is a partial extraction of FIG. 3, in which the power receiving line is connected to the rail at 43 points without extending the extension line from 14 points.

In FIG. 4, it is assumed that the noise electromagnetic field φm radiated by the electric car intersects perpendicularly to the plane of the paper.

Although this noise electromagnetic field φm is small, it intersects between the auxiliary line and the rail, so that noise induced voltages en and e'n are generated on the auxiliary line.

However, this induced voltage is short-circuited by the one-turn ring connected at 22 points and does not occur as a voltage drop between P1 and 22.

On the other hand, the component of E due to the AF transmission current i has δl as a voltage drop due to the effective resistance r of the rail and the reactance XL.

In the AF frequency band, r<X, □, and the inductance of the rail, which can be considered as reactance, is found to be approximately 1 mH/Km.

Therefore, if a current of around 100 mA is obtained as the AF transmission current i, a practically sufficient level of 61 can be obtained.

Furthermore, since a mutual inductance M exists between the rail and the auxiliary wire, an induced voltage em due to this is added.

Therefore, the combined voltage of all the voltages mentioned above is P,, P
This will occur between three points.

In other words, the rail inductance between the three points P, , and P is
Then E””em + eL + (em en)
If we set m v''' en, then E=eat+et lEl= (aIM)2+ (coLx)2t, and the induced voltage on the auxiliary wire due to the noise electromagnetic field radiated by the electric cars partially intersecting perpendicularly to the rail surface is Almost never occurs A
It is possible to extract only the component of the F transmission current i.

As detailed above, according to the power receiving device of the present invention, the insulated conductor wire attached to the rail can be easily connected to the rail.
The F transmission current and current components can be easily extracted, improving the S/N ratio and minimizing the influence of the thyristor noise electromagnetic field radiated by electric cars.
This has the effect of significantly increasing the reliability of the AF track circuit since malfunctions of the receiver can be prevented.

[Brief explanation of drawings]

Figure 1 shows a conventional AF track circuit, Figure 2 shows an example of a power receiver,
FIG. 3 is a power receiving device of the present invention, and FIG. 4 is a partial view of FIG. 3.

Claims (2)

[Scope of utility model registration request] (1) In a power receiving device for an audio frequency track circuit using a track rail, insulated conductors are connected to both sides of one end of the power receiving part of the rail, and are connected along the side part of the rail toward the other end of the power receiving part. The insulated conductive wire is connected to both sides of the side part of the other end of the power receiving part, and the insulated conductive wire is extended from the said one end and the other end is extended along the side part of the rail to one end of the power receiving part. At the parts where the more extended insulated conductors face each other, pull out the insulated conductor on one side to the other side of the rail and connect it to the insulated conductor on the other side, and use the lead wires at the two connection ends as the power receiving ends, A power receiving device that receives the voltage drop that occurs in the insulated conductor and the induced voltage that is induced in the insulated conductor. (2) The power receiving device according to claim 1, wherein one of the insulated conductive wires does not extend along the side portion of the rail.