JPH0747250Y2 - Track circuit power receiving device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power receiving device in a non-insulated track circuit for detecting a train position.

[0002]

2. Description of the Related Art Non-insulated track circuits are track circuits that do not have rail insulation at the boundaries of the circuits. In this non-insulated track circuit, the transmission point adopts voltage transmission with a simple configuration and good transmission efficiency to clarify the boundary point of the train detection section, and the reception point is the voltage reception according to the system performance requirements. Three types of current reception and voltage / current reception are adopted. The voltage / current receiving method is as shown in the track circuit configuration diagram of FIG.
At the transmission point, there is a transmitter 3 connected to the rails 1 and 2 via a matching transformer 5, and at the reception point there is a current coil 31 wound between the rails 1 and 2. Resistance 33 to rails 1 and 2
Has a voltage coil 32 connected through. Then, an induced voltage proportional to the inter-rail voltage Vr detected by the voltage coil 32 is added to the induced voltage proportional to the rail current Ir detected by the current coil 31 and sent to the receiver 4 via the matching transformer 34. ing. This voltage-current receiving method improves the noise resistance by adjusting the ratio of the voltage component and the current component, and can keep the reception level almost constant until the train passes the boundary. It is possible to obtain a clear train entry detection boundary characteristic that is not different from the method.

[0003]

However, in the voltage / current power receiving system, the current coil 31 and the voltage coil 32 must be provided between the rails 1 and 2, and the construction and maintenance thereof have not been easy.

The present invention has been made in order to solve such disadvantages, and an object thereof is to obtain a track circuit power receiving device which has the same train entrance detection boundary characteristics as the conventional one and can be easily installed. It is a thing.

[0005]

A track circuit power receiving device according to the present invention is a track circuit power receiving device employing voltage transmission.
There is a matching transformer and a receiver. The matching transformer detects changes in rail current and rail-to-rail voltage and sends them to the receiver, and has a coil with two windings on the primary side. On the secondary side
It consists of a 3-winding transformer with a 1-winding coil, and one coil on the primary side is for the rail current flowing in one rail.
It detects the voltage drop in a certain length.
The transmission point of the rail and the position separated by a certain distance from the transmission point
Connected to and the other coil detects rail-to-rail voltage
It is connected to the transmission point of two rails via a resistor
The secondary side coil synthesizes a voltage proportional to the voltage detected by each primary side coil and sends it to the receiver.

[0006]

In the present invention, one coil on the primary side of the three-winding transformer primary side detects a voltage drop due to a rail of a constant length to detect a change in rail current. The voltage difference between the rails detected by the other coil is added to the voltage component due to the loop current, and the boundary point of the track circuit is clarified by sending it to the receiver.

Further, since the three-winding transformer detects the rail current component and the inter-rail voltage component without providing a loop coil between the rails, the rail current component can be simply constructed. And the voltage component between the rails is detected.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a track circuit diagram showing an embodiment of the present invention. As shown in the figure, a transmitter 3 and a receiver 4 are provided near the boundary points of the rails 1 and 2 where the signal devices S1 and S2 are installed. The transmitter 3 sends a voltage of a specific frequency to the rails 1 and 2 via the matching transformer 5, and the rails 1 and 2 are transmitted.
A rail current Ir is passed through. The receiver 4 extracts the train detection signal from the signal sent from the matching transformer 6, determines the signal level, and drives an on-rail relay (not shown). The matching transformer 6 detects changes in the rail current Ir and the inter-rail voltage Vr and sends them to the receiver 4. The matching transformer 6 has coils 7 and 8 of two windings on the primary side, and the secondary side. 3 with one winding coil 9
It is composed of a winding transformer. One coil 7 on the primary side of the matching transformer 6 has a rail current Ir flowing through the rail 2.
Voltage drop V _{2 over} a constant length A of, for example, about 10 m
Is detected to obtain the rail current Ir, and the rail 2
Is connected to a transmission point and a position at a fixed distance A from the transmission point. The other coil 8 detects the inter-rail voltage Vr and is connected to the rails 1 and 2 at the transmission point via a resistor 10. The coil 9 on the secondary side sends to the receiver 4 a signal voltage V ₁ that is a combination of voltages proportional to the voltages V ₂ and Vr detected by the coils 7 and 8 on the primary side.

In the track circuit constructed as described above, assuming that the resistance value of the rail 2 of the constant length A is R ₁ , the voltage drop V ₂ of the constant length A due to the rail current Ir is V ₂ = R ₁
Become Ir. The current I flowing in the coil 7 due to this voltage V ₂
i is proportional to the rail current Ir and substantially coincides with the rail current Ir. The current Iv flowing through the coil 8 is proportional to the inter-rail voltage Vr, and if the impedance jωL of the coil 8 is set to be much smaller than the resistance value R of the resistor 10, then Iv =
It becomes Vr / R.

Here, the coupling coefficient between the coils 7 and 9 is k
Assuming that the coupling coefficient of the coil 8 and the coil 9 is kv, the signal voltage V ₁ generated in the coil 9 by the combination of the current Ir flowing in the coil 7 and the current Iv flowing in the coil 8 is V ₁ = kiIr + k
It becomes vVr / R. This signal voltage V ₁ changes as the train 21 approaches the transmission point of the track circuit due to the axle short-circuit effect, as shown in the train detection characteristic diagram of FIG. That is, the rail-to-rail voltage Vr gradually decreases, but the rail current Ir gradually increases, reaches a maximum when the train 21 reaches the transmission point, and sharply decreases when the train 21 passes the transmission point. The signal voltage V ₁ obtained by combining these signals maintains a substantially constant level up to the vicinity of the receiving point, and sharply decreases at the transmitting point to exhibit train detection characteristics similar to those of the conventional voltage / current receiving system. The receiver 4 receives the signal voltage V ₁ and detects that the train 21 has reached the transmission point.

By detecting the rail current Ir and the inter-rail voltage Vr by the coils 7 and 8 as described above, a current coil or a loop coil of a voltage coil is not provided between the rails 1 and 2. In addition, train entry can be detected to the same extent as the conventional voltage-current receiving system.

[0012]

As described above, the present invention detects a voltage drop due to a rail of a fixed length in one coil on the primary side of a three-winding transformer to detect a change in rail current. Detect and
Since the voltage component due to the rail current is added to the change in the inter-rail voltage detected by the other coil and sent to the receiver, the loop coil is not provided between the rails and the boundary of the track circuit is not provided. I can clarify the points.

Further, since it is not necessary to provide a loop coil between the rails, the rail current component and the inter-rail voltage component can be detected by simple construction, and maintenance and inspection can be easily performed. It can be carried out.

[Brief description of drawings]

FIG. 1 is a track circuit configuration diagram showing an embodiment of the present invention.

FIG. 2 is a train detection characteristic diagram of the above embodiment.

FIG. 3 is a track circuit configuration diagram showing a conventional voltage-current receiving system.

[Explanation of symbols]

 1 rail 2 rail 3 transmitter 4 receiver 6 matching transformer 7 coil 8 coil 9 coil

Claims (1)

[Scope of utility model registration request] 1. A power receiving device for a track circuit adopting voltage transmission.
A matching transformer and a receiver. The matching transformer detects changes in rail current and rail-to-rail voltage and sends them to the receiver, and has a coil with two windings on the primary side. ,Secondary side
It consists of a 3-winding transformer with a 1-winding coil, and one coil on the primary side is the rail current flowing in one rail.
The voltage drop over a fixed length of
The transmission point of one rail and the position at a certain distance from the transmission point
And the other coil detects the rail-to-rail voltage.
It connects to the transmission points of the two rails via resistors.
The track circuit power receiving device, characterized in that the secondary side coil synthesizes a voltage proportional to the voltage detected by each primary side coil and sends it to the receiver.