JPH0612253U - 3-wire track circuit - Google Patents

Abstract

(57) [Summary] [Purpose] To detect trains running on narrow gauge and standard gauge with a simple configuration. [Structure] The orbital transformer 4 sends out signal currents of the same frequency to a narrow gauge and a standard gauge having a single rail 1 that is commonly used. A phase comparison relay in which the signal currents flowing in the narrow gauge and the standard gauge are connected so as to have opposite polarities.
The presence or absence of narrow gauge and standard gauge trains is detected by the track relays 7 and 8.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a three-wire track circuit that detects a narrow gauge train and a standard gauge train that run on a single rail in both the non-electrified section and the non-electrified section.

[0002]

[Prior art]

 In non-electrified sections where trains run on narrow gauge and standard gauge respectively, or in non-electrified sections and electrified sections, rail 1 is used as a common rail and narrow gauge trains are designated as rail 1 as shown in Fig. 3. Running on rail 2, a standard gauge train runs on rails 1 and 3. In order to detect the train running on the narrow gauge and the train running on the standard gauge, two sets of track circuits using rail 1 are used.

As described above, in order to prevent signal currents from interfering with each other in the two sets of track circuits sharing the rail 1, for example, in the DC electrification section of the standard track, the track transformer 4 is connected to the power transmission side. A commercial frequency track circuit is used that detects the signal current of 50 Hz sent out through the impedance bond 5 via the impedance bond 6 on the landing side with the track relay -21. Further, in a narrow gauge non-electrified section where a diesel vehicle travels, a frequency divider 22 sends out a signal current of 25 Hz with the commercial frequency halved, for example, and the signal current is multiplied by a frequency doubler via a matching transformer 23. It uses a frequency-divided orbit circuit that is received at 24, doubled to 50 Hz, and sent to the orbit relay-25. In the figure, R ₁ , R ₂ and R ₃ are track resistors.

[0004]

[Problems to be solved by the device]

 However, as described above, the frequency division track circuit that uses a special frequency requires expensive frequency converters such as frequency dividers and frequency dividers, and requires adjustment and maintenance such as frequency dividers and frequency dividers. Was not easy.

Further, in order to ensure safety and certainty, a spare machine for each component device of the commercial frequency track circuit and the frequency division track circuit is required, and the track circuit as a whole becomes expensive.

The present invention has been made to solve the above disadvantages, and an object thereof is to obtain a three-wire track circuit capable of reliably detecting a train running on narrow gauge and standard gauge with a simple configuration. To do.

[0007]

[Means for Solving the Problems]

 A 3-wire track circuit according to the present invention is a 3-wire track circuit having one AC power supply provided on the power transmission side and two track relays provided on the power reception side. The line-type track circuit detects a train running on a single rail of narrow gauge and standard gauge in the non-electrified section or in the non-electrified section and the electrified section. -It sends a signal current to the narrow gauge and the standard gauge, and the two track relays detect the train by receiving the signal currents of the narrow gauge and the standard gauge. Each of them is a phase comparison relay. One track relay is connected to narrow gauge, the other track relay is connected to standard track with the reverse polarity of the track relay connected to narrow track, and each track relay is reverse polarity to the local power source. It is characterized by being connected with.

[0008]

[Action]

 In this invention, the signal currents of the same frequency are sent from the AC power source to the narrow gauge and the standard gauge having one rail shared in common. The signal currents flowing in the narrow gauge and the standard gauge are detected by the railroad relay consisting of phase comparison relays connected so as to have opposite polarities, and the presence or absence of the narrow gauge and standard gauge trains is detected.

[0009]

【Example】

 FIG. 1 is a block diagram showing an embodiment of the present invention. As shown in the figure, the narrow gauge, which is the non-electrified section, and the standard gauge, which is the DC electrified section, use the rail 1 as a common rail, and the narrow gauge track circuit uses the rail 1 and the rail 2. The standard track circuit uses rails 1 and 3 to form a 3-wire track circuit. This three-wire track circuit is provided with one track transformer 4 on the power transmission side and two track relays 7 and 8 on the power receiving side.

The orbital transformer 4 sends out a signal wave of 50 Hz, and the orbital resistor R ₁ and the impedance bond are arranged so that a signal current in a direction indicated by an arrow 9 flows through the rails ₁ and 3 of the standard rail. It is connected via 5. Further, in the orbit transformer 4, the signal current flowing in the narrow gauge rails 1 and 2 is made to flow in the same direction as the signal current flowing in the standard gauge in the rail 1 shared with the standard gauge as shown by an arrow 10. It is connected to narrow gauge rails 1 and ₂ via an orbital resistor R ₂ .

The orbital relays 7 and 8 are respectively composed of phase comparison relays, the orbital relay 7 is connected to a standard rail via an impedance bond 6, and the orbital relay 8 is connected via an orbital resistor R _3. It is connected to narrow gauge rails 1 and 2. The track relays 7 and 8 are connected so that the signal currents flow in opposite polarities, and the local power supplies are connected in reverse polarities.

In the three-wire track circuit configured as described above, the standard track signal current and the narrow track signal current flowing through the single rail 1 shared by the track transformer 4 provided on the power transmission side are Signal currents of 50 Hz are sent to the standard gauge rails 1 and 3 and the narrow gauge rails 1 and 2 so that they flow in the same direction. This signal current is detected by rails 1 and 3 and orbital relays 7 and 8 connected to the rails 1 and 2 in opposite polarities. On the other hand, the orbit relays 7 and 8 are supplied with the reference voltage of 50 Hz whose polarity is changed according to the polarity of the input signal current from the local power supply. Signal from the impedance bond 6 is sent, and the track relay 8 is lifted when the signal current is sent from the rails 1 and 2. When a train running on a standard track enters the track circuit AT and short-circuits the rails 1 and 3, the track relay 7 falls and detects the train. When a train running on a narrow gauge enters the track circuit AT and shorts the rails 1 and 3, the track relay 7 falls and detects the train.

In this way, the signal current of the commercial frequency is sent to the standard track circuit and the narrow track circuit in the same direction, and the standard tracks and the narrow track are detected even by the track relays 7 and 8 with the polarities changed. The trains running can be clearly distinguished and detected.

When a train is detected with the standard gauge and the narrow gauge, the leakage current of the narrow gauge signal current with respect to the track circuit of the standard gauge has a higher impedance of the impedance bonds 5 and 6 than the rail impedance. Because of that, it becomes minute. Further, the leakage current of the standard gauge signal current to the narrow gauge track circuit becomes minute when the resistances of the track resistors R ₂ and R ₃ of the narrow gauge track circuit are made larger than the resistance of the standard gauge track resistor R _1. Therefore, trains can be detected with almost no mutual influence of leakage current.

In addition, due to some reason, a large amount of leakage current from the narrow gauge track circuit circulates in the track relay-7, or a large amount of leakage current from the standard track circuit in the track relay-8. Even if it goes around, the signal current and the leak current cancel each other out, and the track relays 7 and 8 fall to ensure safety.

Further, the rails 1 and 3 forming the standard gauge track circuit and the rails 1 and 2 forming the narrow gauge track circuit are broken, and the track transformer 4 and the track relays 7 and 8 are installed. Even if the cable connected to the rail or the like is broken or the rail insulation is short-circuited, the track relays 7 and 8 fall and the safety can be ensured.

The track circuits adjacent to each other can ensure safety by connecting the track relays 7 and 8 so that the polarities thereof are different from each other as in the conventional case.

In the above-mentioned embodiment, the case where the standard gauge signal current and the narrow gauge signal current flowing in the single shared rail 1 are sent out so as to flow in the same direction, but as shown in FIG. Even if the standard gauge signal current and the narrow gauge signal current flowing in one rail 1 are sent so as to flow in different directions, the same operation as in the above embodiment can be achieved.

In the above embodiment, the case where the rail 1 is the common rail with the narrow gauge which is the non-electrified section and the standard gauge which is the direct current electrified section has been described. However, the standard gauge is the AC electrified section. Can be similarly applied.

[0020]

[Effect of device]

 As described above, the present invention sends a signal current of the same frequency to each of a narrow gauge and a standard gauge that have a single rail shared by an AC power source, and outputs a signal current flowing to each of the narrow gauge and the standard gauge. Since the railroad tracks are connected so that their polarities are opposite to each other, the presence or absence of a train running on narrow gauge and standard gauge can be reliably detected with a simple configuration.

Moreover, since the equipment used for the track circuit can be simplified, the track circuit as a whole can be formed at low cost, and maintenance and inspection can be facilitated.

[Brief description of drawings]

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

FIG. 2 is a configuration diagram showing another embodiment.

FIG. 3 is a configuration diagram showing a conventional example.

[Explanation of symbols]

 1,2,3 Rail 4 Orbital Transformer 5,6 Impedance Bond 7,8 Orbital Relay

Claims (1)

[Scope of utility model registration request] 1. An AC power supply provided on the power transmission side,
A three-wire type track circuit having two track relays provided on the power receiving side, wherein the three-wire type track circuit is a single rail of narrow gauge and standard gauge in the non-electrified section or in the non-electrified section and the electrified section. −
It detects trains that run on the same rail, and the AC power supply sends a signal current to the narrow gauge and standard gauge rails. Two track relays are connected to the narrow gauge and standard gauge, respectively. Is for detecting trains by receiving signal currents of narrow gauge and standard gauge, each consisting of phase comparison relays, one track relay is connected to narrow gauge, and the other track relay is connected to narrow gauge. A three-wire track circuit characterized in that it is connected to a standard track with the reverse polarity of the relay and each track relay is connected to the local power supply with the reverse polarity.