JP2011000976A - Rupture detector to be attached to train detection device for three-wire track circuit using digital telegram - Google Patents

Abstract

PROBLEM TO BE SOLVED: To overcome the problem in which the conventional rupture detection of a common rail using a rupture detection CT in a three-wire track circuit is limited in sensing capability, and requires a special detecting CT separately.SOLUTION: A rupture of the common rail is detected by serially adding a transmitting MT and a receiving MT to each of train detecting circuits for local train and bullet train, and providing a function of determining a combination of receiving levels of respective train detection signals carried in the local train and bullet train MTs to detect a combination of signal receiving levels which is caused by rupture of the common rail.

Description

  The present invention is intended for a track circuit on a three-wire track in which a train between different tracks is driven by three rails among track circuits that are one of the train detection devices in a railway, and particularly uses a digital telegram as a train detection signal. The present invention relates to a break detection device for detecting a break of a common rail in the device.

  In the three-wire track circuit, when the common rail breaks, the reception level hardly attenuates due to the return via the conventional rail and the Shinkansen rail, and it cannot be determined as abnormal.

  As a conventional technique related to the present invention, there is a break detection technique using a break detection CT (current transformer). In a normal track circuit, when a rail break occurs, the train detection signal stops flowing and the reception level is attenuated, so that the track circuit falls and the track circuit transitions to the safe side.

  However, in the three-wire track circuit, unlike the conventional track circuit, the third rail is the train detection signal circuit, so even if the common rail breaks, the signal flows through the other rail and receives the signal. The level does not attenuate sufficiently. Therefore, in the three-wire track circuit, depending on the state of rail breakage, the track circuit may not drop and may not transition to the safe side.

  Therefore, in the prior art, as shown in FIG. 5, in the train detection device applied to the three-wire track circuit, a three-winding current transformer 2 is added in series to the train detection circuit for each of the conventional line and the Shinkansen. The fracture detection CT for detecting a signal obtained by synthesizing the outputs of the above is used. Under normal conditions, the break detection CT outputs a signal that combines the signals of the conventional line and the Shinkansen. However, if the common rail breaks, the direction of the train detection signal flowing into the current transformer changes. However, the reception level of the synthesized signal is greatly attenuated. Therefore, the common rail breakage is detected by monitoring this signal level.

  Further, for example, in Patent Document 1, a three-wire track circuit is formed by a common rail, a standard rail dedicated rail, a narrow rail dedicated rail, and two impedance bonds ZB11 and ZB22, and a standard rail signal current detector and a narrow rail are formed. An invention of a three-wire track circuit that detects a rail breakage by detecting a signal current of a train detection signal by a signal current detector for use is described.

JP-A-10-53134

  In the above technology, when the rail detection signal breaks down due to current leakage in the track circuit, imbalance between the signal levels of the conventional line and the Shinkansen, or cable mixture, etc. In this case, the reception level from the break detection CT may not be sufficiently attenuated. In addition, there is a possibility that the threshold value for detecting breakage needs to be set finely in consideration of the conditions for each track circuit.

  Considering the case where a train detection signal is transmitted to another track circuit due to cable contact or the like, it is necessary to divide the cable for each track circuit or to install a device for detecting contact. The fact that these methods have to be taken is a heavy burden when considering reductions in equipment costs and maintenance costs.

  Moreover, the technique described in the above cited reference 1 requires two impedance bonds ZB11 and ZB22, a standard gauge signal current detector, and a narrow gauge signal current detector, and the configuration of the apparatus becomes complicated and large. was there.

  The object of the present invention is to determine an abnormality without incurring the above-mentioned burden when the various conditions such as the leakage state of the track circuit are different or the reception level from the current transformer is not sufficiently attenuated due to cable contact or the like. It provides a possible technique.

  In order to solve the above problems, the break detection device of the present invention is a break detection device that is added to a train detection device for a three-wire track circuit that uses a digital telegram as a signal for train detection. When a transmission MT and a reception MT are added in series to each train detection circuit, and the common rail used in common by the conventional line and the Shinkansen breaks, the reception level from the reception MT is greatly attenuated. As a result, the break of the common rail is detected, and the signal received from the three-winding current transformer is demodulated. If the demodulated signal is invalid, the corresponding track circuit is dropped. And safe side control.

  In the present invention, a digital telegram is used as a train detection signal in the train detection device. Even in the current transformer, this digital telegram is received, so if the received signal is demodulated, if it cannot be demodulated or the contents are illegal, it is judged as abnormal and the corresponding track circuit is dropped, and the safety side control And

  The message is demodulated by a digital signal processor (hereinafter referred to as “DSP”) that receives the reception level from the current transformer, and the normal / abnormal judgment is performed by a logic unit that is the core of the train detection device.

  According to the present invention, it is possible to detect the break of the common rail without installing the break detection CT. In addition, even if a train detection signal is routed to another track circuit due to cable contact, etc., it is not necessary to divide the cable for each track circuit or install a device to detect contact. Can be judged. In addition, it can give more reliability by using the above-mentioned correspondence together.

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention. FIG. 2 is a diagram illustrating a flow of a train detection signal in a normal state. FIG. 3 is a diagram illustrating a flow of a train detection signal when the common rail is broken. FIG. 4 is a diagram showing rail breakage determination conditions. FIG. 5 is a diagram showing a configuration of a conventional breakage detection method.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows the configuration of the present invention. Train detection signals transmitted from the transmission MTs 6 and 7 to the track are received by the reception MTs 8 and 9, and various measurement information such as reception levels and phases are transmitted to the break detection function 1. The same applies to the conventional line MT and the Shinkansen MT.

  Various measurement information such as the reception level and phase transmitted to the break detection function 1 is demodulated by the DSP 10 and the logic unit 11 cannot demodulate or if the demodulated signal has illegal contents. Safety control is achieved by dropping the corresponding track circuit.

  FIG. 2 shows a main flow of a train detection signal in a normal state where there is no abnormality in the rail. In this figure, signals for the Shinkansen are shown. This signal also flows slightly in the conventional line MT to which the MT is electrically connected, but is omitted in FIG.

  FIG. 3 is a flow of a train detection signal when there is an abnormality in the common rail. Since the flow shown in FIG. 3 is interrupted by breakage, the sneak signal to the conventional line MT increases and the impedance of the entire circuit increases, so the signal level observed on the Shinkansen MT decreases.

FIG. 4 shows the relationship between the observed level change and rail breakage determination.
The reason why there is a certain range for the level at the time of break in normal times is due to changes in the orbital state due to weather fluctuations and the like. When this variation is large, there is a possibility that a change in reception level due to weather variation and a level change due to rail breakage cannot be distinguished by simple threshold setting.

  In FIG. 4, in the determination only on the horizontal axis, this can be seen from the fact that the regions overlap. In the present invention, it is possible to distinguish between a normal level and a change in signal level when a break occurs by simultaneously determining a change in reception level on the conventional line side. Note that the sign of the level here can be determined by the phase of the signal.

  In the description of FIG. 4, the determination of the combination of the reception levels is made in the two-dimensional region. However, the determination in the multidimensional region can be similarly performed by inputting the voltage, current, and impedance.

  INDUSTRIAL APPLICABILITY The present invention can be applied to signal security devices that employ a three-wire track, among signal security devices in railways. In addition, for a signal security device such as a non-insulated track circuit in which a train detection signal or a train control signal may circulate to a plurality of receiving devices, a failure of the device is detected using the same method as the present invention. It is possible.

  For example, even when the cable connected to the track circuit connection point drops, the impedance seen from the signal transmitter and receiver connected to the track circuit changes. The level of the signal received at By making it possible to detect combinations of signal levels detected by each device in advance, corresponding to failures and abnormal patterns, it is possible to detect failures that were simply regarded as abnormal track circuits in the past or failures that were overlooked. It becomes possible.

1 Break detection function 2 Three-winding current transformer 3 Shinkansen rail 4 Conventional rail 5 Common rail 6 Transmission MT
7 MT for transmission
8 MT for reception
9 MT for reception
10 DSP
11 logic

Claims (2)

  In the break detection device that is added to the train detection device for a three-wire track circuit that uses a digital telegram for the train detection signal, a transmission MT and a reception MT are added in series to the train detection circuit for each of the conventional line and the Shinkansen. When the common rail used in common with the conventional line and the Shinkansen breaks, the reception level from the receiving MT is greatly attenuated to detect the break of the common rail, and the three-winding current transformer. A break detecting device characterized by demodulating a signal received from the vehicle and making the safety side control by dropping the corresponding track circuit when the demodulated signal cannot be demodulated or when the demodulated signal has illegal contents.   The break detection device according to claim 1, wherein a combination of strengths of train detection signals detected by a train detection circuit for each of the conventional line and the Shinkansen is determined, and the break of the common rail is detected. Break detection device.

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