JPH0539041A - Non-insulated track circuit device for voltage transmission/reception system - Google Patents

Abstract

PURPOSE:To clarify the boundary point of a train detection segment and extend the train detection segment. CONSTITUTION:Two frequencies, a relatively high frequency and a relatively low frequency, are frequency-deviation-modulated or mixed and transmitted as the train detection signal from a transmitter 1 provided at the middle section from the approach side of a train detection segment. A receiver 2 provided at the approach end receives only the train detection signal with the relatively high frequency. The train detection signal with the relatively high frequency is transmitted from the transmitter 1 provided at the middle section from the approach side, thus the attenuation in the track circuit can be reduced, and the boundary point is clarified. A receiver 3 provided at the exit end receives only the train detection signal with a relatively low frequency and little attenuation, and the train detection segment is extended.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-insulated track circuit device of a voltage transmission / reception system in a non-insulated track circuit for detecting a train position, and particularly to securing a long train detection section and improving boundary accuracy on the approach side. ..

[0002]

2. Description of the Related Art Non-insulated track circuits are track circuits that do not have track insulation at the boundaries of the circuits, and are roughly classified into a resonance type that uses rail resonance and a non-resonance type that does not use rail resonance. .. In the resonance type, a short-circuit line or a resonance element is inserted between the rails to prevent wraparound on other tracks, and the boundary point of the train detection section is clarified. Since this resonance type arranges various devices around the track circuit, construction and maintenance inspection are complicated,
Since the non-resonance type does not use rail resonance, the equipment around the track circuit can be configured with simple and stable equipment, and the labor for construction and maintenance can be saved. In this resonance type non-insulated track circuit, the transmission point adopts voltage transmission with a simple structure and good transmission efficiency, and the reception point has three methods of voltage reception, current reception and voltage current reception according to the performance requirements of the system. Has been adopted. Among these three methods, the voltage power transmission / reception method can be made the simplest because the track requires only the electric wire for connecting the matching transformer and the rail.

[0003]

The demarcation point of the train detection section in the above voltage transmission / reception system is determined by adding rail impedance to the axle short circuit resistance of the train approaching the demarcation point and the rail. It is determined by the shunt ratio with the internal resistance of the connected transmitter or receiver. Therefore,
The higher the ruimpance, that is, the higher the frequency used for the train detection signal, the more clearly the boundary point can be defined. On the other hand, the train detection signal is more attenuated in the track circuit as the frequency used is increased, and it is difficult to configure a long detection section. In this case, by transmitting a train detection signal from the middle part of one train detection section, and by providing a track circuit configuration in which receivers are provided at both ends of the train detection section,
The train detection section can be doubled in length. However, to clarify the boundary point, for example, 20KH
From z, train detection signals with a frequency of about 30 KHz or more had to be used, and the train detection section at this time was about 800 m at maximum, and it was difficult to secure a longer train detection section.

The present invention has been made in order to solve the above drawbacks, and it is a non-insulated track circuit device of a voltage transmission / reception system capable of clarifying a boundary point of a train detection section and lengthening a train detection section. The purpose is to obtain.

[0005]

SUMMARY OF THE INVENTION A non-insulated track circuit device according to the present invention is a transmitter provided at an intermediate portion of a train detection section from an entrance side and a reception provided at both terminals of the train detection section. A non-insulated track circuit device of a voltage power transmission / reception system having a transmitter, wherein the transmitter transmits a train detection signal, and has a signal wave generation unit and a transmission unit, and the signal wave generation unit has two frequencies. Generates train detection signals including
An oscillator that generates a train detection signal of a relatively high frequency,
An oscillator that generates a train detection signal of a relatively low frequency,
It has a converter for alternately frequency-shifting or mixing the two frequencies of the train detection signal generated by both oscillators, and the transmitter transmits the train detection signal generated by the signal wave generator and is provided at the approach end. The receiver that receives the train detection signal transmitted to the approach side has a bandpass filter and a signal receiver, and the bandpass filter passes only the train detection signal of a relatively high frequency, The receiver receives the train detection signal of a relatively high frequency sent from the bandpass filter, and the receiver installed at the exit end receives the train detection signal sent to the exit side. The bandpass filter has only a relatively low frequency train detection signal, and the signal reception unit receives the relatively low frequency train detection signal sent from the bandpass filter. Characterize.

[0006]

According to the present invention, a frequency difference modulation or a relatively high frequency and a relatively low frequency as a train detection signal are alternately transmitted from a transmitter provided in an intermediate portion from the approach side of the train detection section. Mix and send. The receiver provided at the approach end receives only the train detection signal having a relatively high frequency. Since the train detection signal of a relatively high frequency received by the receiver installed at this approach end is sent from the transmitter installed in the middle part from the approach side, it is possible to reduce the attenuation in the track circuit and reduce the boundary point. To clarify.
The receiver provided at the advance end receives only the train detection signal of a relatively low frequency with little attenuation, and lengthens the train detection section.

[0007]

1 is a block diagram showing an embodiment of the present invention. A transmitter 1 is provided in the middle of each track circuit 1T, 2T, 3T from the entry side, and receivers 2 and 3 are provided at the entry end and the exit end, respectively. The transmitter 1 has a signal wave generator 4, a transmitter 5, and a matching transformer 6 connected in the middle of the approach side of the track circuit.

The signal wave generator 4 has oscillators 7, 8, 9 and a modulator 10. The oscillator 7 has a relatively high frequency, for example
Train detection signals of frequencies FH1 to FH3 of about 3 frequencies out of the frequencies of 20 KHz to 30 KHz are selected, generated, and sent to the modulator 10. The oscillator 8 has a relatively low frequency, for example 1KH
The train detection signals of multiple frequencies FL1, FL2, ..., FLn of about z to 2 KHz are selected, generated, and sent to the modulator 10. The oscillator 9 generates a modulated wave of frequency Fm and sends it to the modulator 10.
The train detection signals of a plurality of waves respectively generated by the oscillators 7 and 8 are track circuits 1T and 2T in order to prevent malfunction due to leakage into adjacent track circuits because the track circuits are non-insulated track circuits. , 3T ... Repetitive frequency array by multiple frequencies is performed. The modulator 10 frequency-shift-modulates the carrier waves sent from the oscillators 7 and 8 and sends the carrier waves to the track circuit via the transmitter 5 and the matching transformer 6.

The receiver 2 provided at the entrance end has a matching transformer 11, a bandpass filter 12, a signal receiver 13 and a line detection relay 14 connected to the entrance end of the track circuit. The bandpass filter 12 sends only the train detection signal of a relatively high frequency sent from the matching transformer 11 to the signal receiving unit 13.

The receiver 3 provided at the advancing end has a matching transformer 15, a bandpass filter 16, a signal receiving section 17, an on-line detection relay 18 and the like connected to the advancing end of the track circuit. The bandpass filter 16 sends only the train detection signal having a relatively low frequency, which is sent from the matching transformer 15, to the signal receiving unit 17 through the signal.

In the non-insulated track circuit device configured as described above, the operation of the track circuit 2T in one section will be described.

The oscillator 7 sends a carrier having a relatively high frequency FH1, for example, 25 KHz, and the oscillator 8 sends a carrier having a relatively low frequency FL1, for example, 1 KHz, to the modulator 10, and both carriers have a frequency of about 10 to 20 Hz. After the shift modulation, the modulated output signal is power-amplified by the transmission unit 5, and then transmitted as a train detection signal to the transmission point 19 of the track circuit 2T via the matching transformer 6. This train detection signal is track circuit 2
It is sent to the receiver 2 provided at the entrance end 20 and the receiver 3 provided at the entrance end 21 via T, and input to the matching transformers 11 and 15, respectively.

The train detection signal input to the matching transformer 11 at the approach end 20 is transmitted to the bandpass filter 12 at a relatively high frequency FH1.
The signals other than the train detection signal and the interfering voltage are removed and sent to the signal receiving unit 13. Since the train detection signal of the relatively high frequency FH1 is sent from the transmitter 1 connected to the transmission point 19 relatively close to the approach end 20 of the track circuit 2T, the train detection signal is transmitted between the transmission point 19 of the track circuit 2T and the approach end 20. The attenuation of can be suppressed to a small level. After the modulated wave is extracted from the train detection signal of frequency FH1 sent to the signal receiving unit 13, the signal level is determined and a predetermined process is performed to operate the on-rail detection relay-14.

As shown in the circuit diagram of FIG. 2, the train detection characteristic of the receiver 2 provided at the approach end 20 has a rail impedance RR and a train 22 axle short-circuit resistance at a frequency FH1 of relatively high frequency of 25 KHz. Since the signal is received by the shunting ratio of the combined resistance of RS and the internal resistance of the receiver 2, even if the train 22 approaches the approach end 20, the reception level does not drop and the boundary can be clarified. ..

On the other hand, the train detection signal input to the matching transformer 15 at the advancing end 21 is filtered by the bandpass filter 16 to remove signals other than the train detection signal of the relatively low frequency FL1 and the interfering voltage. Sent. Since the train detection signal sent to the signal receiving unit 17 has a relatively low frequency FL1, the attenuation of the train detection signal can be suppressed to be small even if the distance between the transmission point 19 and the advancing end 21 is increased. After the modulated wave is extracted from the train detection signal of frequency FL1 sent to the signal receiving unit 17, the signal level is determined and a predetermined process is performed to operate the on-rail detection relay-18.

As shown in the circuit diagram of FIG. 2, the train detection characteristic of the receiver 3 provided at the advancing end 21 is the rail impedance RR by the frequency FL1 as relatively low as 1 KHz and the last part of the train 23. Since the signal is received by the shunt ratio of the combined resistance of the axle short-circuit resistance RS and the internal resistance of the receiver 3, even if the rearmost portion of the train 23 passes through the exit end 21, the frequency is higher than that of the approach end 20 side. The position where the receiver 3 detects the advance of the train becomes distant by the lower the value of. This means that the signal display for the following trains will be delayed by that amount,
If the track circuit 2T has a long length, it does not cause a problem. Rather, when the train detection signal received by the receiver 3 has a low frequency, the train detection signal is less attenuated and the track circuit has a large leak conductance, or even when the fluctuation is taken into consideration, the transmission point 19 and the approach end 20 are separated from each other. It can be made long, and a long track circuit with a length of 2 to 3 km can be constructed. In addition, even if the signal display for the following train is delayed, by confirming that the transmission point 19 is cleared,
It is possible to speed up the signal display.

Although the above embodiment has been described with reference to the case where the signal wave generator 4 of the transmitter 1 is provided with the modulator 10, as shown in the block diagram of FIG. 3, the signal wave generator 4 is relatively expensive. twenty five
Even if the frequency mixer 10a for mixing the carrier wave of the frequency FH1 of KHz and the carrier wave of the frequency FL1 of 1 KHz, which is relatively low, is provided, the same operation as the above embodiment can be achieved.

[0018]

As described above, the present invention alternates between a relatively high frequency and a relatively low frequency as a train detection signal from a transmitter provided in the middle of the train detection section from the approach side. It was installed at the approach end because the receiver provided at the approach end received only the train detection signal of high frequency within a relatively short distance from the transmission point. The attenuation of the high frequency train detection signal received by the receiver can be reduced. Since the receiver on the approach side detects the train by the train detection signal of this relatively high frequency with little attenuation, the boundary of the approach point can be made clear.

Further, since the receiver provided at the advance end receives only the train detection signal of a relatively low frequency with little attenuation, the distance from the transmission point to the advance point is increased, so that the train 3K from the conventional maximum 800mm
It can be as long as m.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a circuit diagram of the above embodiment.

FIG. 3 is a block diagram showing another embodiment.

[Explanation of symbols]

 1 transmitter 2 receiver 3 receiver 4 signal wave generator 7 oscillator 8 oscillator 9 oscillator 10 modulator 10a frequency mixer 12 bandpass filter 16 bandpass filter

Claims (1)

[Claims] 1. A non-insulated track circuit device of a voltage power transmission / reception system having a transmitter provided in an intermediate portion from the approach side of the train detection section and receivers provided at both terminals of the train detection section. Then, the transmitter is for transmitting a train detection signal, has a signal wave generation unit and a transmission unit, and the signal wave generation unit is for generating a train detection signal including two frequencies,
An oscillator that generates a train detection signal of a relatively high frequency,
An oscillator that generates a train detection signal of a relatively low frequency,
It has a converter for alternately frequency-shifting or mixing the two frequencies of the train detection signal generated by both oscillators, and the transmitter transmits the train detection signal generated by the signal wave generator and is provided at the approach end. The receiver that receives the train detection signal transmitted to the approach side has a bandpass filter and a signal receiver, and the bandpass filter passes only the train detection signal of a relatively high frequency, The receiver receives the train detection signal of a relatively high frequency sent from the bandpass filter, and the receiver installed at the exit end receives the train detection signal sent to the exit side. The bandpass filter has only a relatively low frequency train detection signal, and the signal reception unit receives the relatively low frequency train detection signal sent from the bandpass filter. Characteristic voltage transmission / reception type non-insulated track circuit equipment .