JP2891679B2 - Non-insulated track circuit device - Google Patents

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 for detecting a train running on a rail having no rail insulation, and more particularly to an improvement in boundary detection characteristics.

[0002]

2. Description of the Related Art A non-insulated track circuit having no rail insulation at a track circuit boundary is indispensable for a boundary configuration replacing rail insulation, and various systems are used as this boundary configuration. In this non-insulated track circuit, the transmitting end employs voltage transmission having a simple structure and good transmission efficiency, and the receiving end detects a voltage between the rails and a rail current and a rail current. A current receiving system and a voltage / current receiving system for detecting a voltage between rails and a rail current are employed.

[0003] As shown in the block diagram of FIG. 4, a voltage is transmitted from a transmitter 1 to a rail 3 of a transmitting end 2, and a voltage is transmitted to a receiver 4.
In the two-voltage power receiving system, the voltages V1 and V2 at two power receiving points 5a and 5b slightly away from the receiving end 5 are detected, and the train 6 is detected from the difference Vr = V1-K · V2 between the detected voltages V1 and V2. Has been proposed (Japanese Patent Laid-Open No. 4-90964). Here, by appropriately selecting the value of K in the range of 0 <K <1, as shown in the train detection characteristic diagram of FIG. 5, the voltage Vr detected at the first power receiving point 5a and the voltage Vr detected at the second power receiving point 5b are changed. The voltage difference Vr = V1−K · V2 from the detected voltage V2 is equal to the train 6
Can obtain a detection value that is relatively independent of the distance to
The detection of entry of the train 6 into the track circuit can be performed between the first power receiving point 5a and the second power receiving point 5b. Therefore, if the distance between the two power receiving points 5a and 5b is appropriately determined, it is possible to satisfy the boundary detection accuracy required for practical use.

[0004]

However, if the difference between the voltages detected at the two power receiving points 5a and 5b is detected as described above, the output fluctuation of the transmitter 1 or the transmission end 2
Since a value proportional to the variation of the reception level by the track circuit from the to the receiving end 5 is detected, it is necessary to set a limit on the amount of these variations. In particular, in the case of a track circuit, fluctuations in the reception level may be large because the leakage current due to rainwater is severe. To cope with this, it is necessary to shorten the control distance of the track circuit to prevent fluctuations in the reception level, and it was not possible to increase the control distance of the track circuit.

When the voltage cannot be detected because one of the two power receiving points is open or the like, the difference voltage Vr becomes "0" or increases. If the voltage Vr increases, the difference voltage Vr may occur under use conditions. It is difficult to distinguish from the maximum value of the reception level fluctuation, and it is difficult to detect a train by simple judgment.

The present invention has been made in order to improve such disadvantages, and an object of the present invention is to provide a non-insulated track circuit which can increase the detection accuracy of track circuit boundaries without being affected by fluctuations in the reception level. Is what you do.

[0007]

According to the present invention, there is provided a non-insulated track circuit device comprising: a transmitter for transmitting power to a transmitting end of a track circuit on a train exit side boundary point; and a receiving end on a train entering side of the track circuit. It has two power receiving points provided at a slight distance from each other, and a receiver for detecting the presence or absence of a train from the voltage of each power receiving point. The receiver has a voltage V1 at a first power receiving point and a second power receiving point. Receiving point V
The second embodiment is characterized in that a specific voltage Kv = V2 / V1 with respect to 2 is calculated, and that the calculated specific voltage Kv detects that the train has reached the boundary of the track circuit.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a non-insulated track circuit device according to the present invention, a transmitter is connected to a transmission end of a track circuit on a train entry side boundary point via a matching transformer, and a transmission end is connected to a train entry side reception end. Two power receiving points are provided at a slight distance from each other, and each power receiving point is connected to one receiver via a matching transformer.

The receiver has a divider, a specific voltage discriminator, a signal discriminator, and a calculator. The divider calculates a specific voltage Kv = V2 / V1 of the voltage V1 detected at the first reception point on the train entry side and the voltage V2 detected at the second reception point on the train entry side, and outputs the result to the specific voltage determination unit. send. The specific voltage determination unit compares the sequentially transmitted specific voltage Kv with a predetermined threshold Th, and when the specific voltage Kv reaches the threshold Th, it is determined that the position of the train has reached the target train approach position. The determination is made, and a signal indicating that the train has reached the approach point on the approach side of the track circuit is sent to the arithmetic unit. The signal discriminating unit detects the voltage V detected at the second receiving point.
Then, when the reception level of the voltage V2 is constantly attenuated to a certain limit from the reception level, it is determined that the train has entered the track circuit, and a train entry signal is sent to the arithmetic unit. When a signal indicating that the train has reached the approaching point of the track circuit and a train entry signal are sent, the arithmetic unit controls the track relay to determine that there is a train in the track circuit.

[0010]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. As shown in the figure, the transmitter 1 is connected via a matching transformer 7 to the transmission end 2 of the track circuit 1T at the train exit side boundary point. The receiving end 5 on the train entry side is provided with two receiving points 5a and 5b at a slight distance L2, and the receiving points 5a and 5b are connected to the receiver 4 via matching transformers 8a and 8b. Have been. This first receiving point 5a
Of the power receiving impedance ZL1 of the second power receiving point 5b is larger than the power receiving impedance ZL1 of the second power receiving point 5b.

The receiver 4 has bandpass filters 41a and 41b, a divider 42, a specific voltage discriminator 43, a signal discriminator 44, and a calculator 45. The bandpass filters 41a and 41b send the train detection signal sent from the matching transformers 8a and 8b to the divider 42 through the train detection signal, and the train detection signal from the bandpass filter 41b is also sent to the signal discriminator 44. The divider 42 outputs a voltage V indicating the reception level of the train detection signal received at the first power receiving point 5a.
Calculate the ratio Kv = V2 / V1 between 1 and the voltage V2 indicating the reception level of the train detection signal received at the second power receiving point 5b. The specific voltage determining unit 43 calculates the specific voltage K calculated by the divider 42.
From v, it is determined whether or not the train 6 has reached the target approach position. The signal determination unit 44 determines the signal transmitted from the transmitter 2 based on the train detection signal received at the second power receiving point 5b, and constantly determines the attenuation of the signal level with respect to the reception level. The calculation unit 45 controls the track relay 9 indicating the presence or absence of the train 6 based on the determination result of the specific voltage determination unit 43 and the determination result of the signal determination unit 44.

In describing the operation of the non-insulated track circuit device configured as described above, the operation principle will be described first.

As shown in the layout explanatory diagram of FIG. 2, the rail impedance between the first power receiving point 5a and the second power receiving point 5b is Z2, and the position of the second power receiving point 5b and the position of the train 6 are shown. Up to Z1, the power receiving impedance of the first power receiving point 5a flows to ZL1, the power receiving impedance of the second power receiving point 5b flows to ZL, the transmitting end 2 and the first power receiving point 5a. The current is I1, and the current flowing between the first power receiving point 5a and the second power receiving point 5b is I2. Here, the first receiving point 5a
Is set larger than the power receiving impedance ZL of the second power receiving point 5b, the current flowing through the transmitting end 2 and the first power receiving point 5a is represented by I1 and the first power receiving point 5a. The current flowing between the second power receiving points 5b is represented by I2
Are substantially equal, and the voltage V detected at the first power receiving point 5a is
1 and the voltage V2 and the voltage ratio K detected at the second power receiving point 5b.
v = V2 / V1 can be expressed by the following equations (1), (2) and (3), respectively.

[0014]

(Equation 1)

Here, when the impedance ZL and the rail impedance Z1 of the second power receiving point 5b satisfy ZL> Z1, the impedance ZL and the impedance Z1 of the second power receiving point 5b are connected in parallel. The impedance is almost equal to Z1 as shown in the following equation (4), and the specific voltage Kv shown in the equation (3) is equal to the impedance Z1 as shown in the following equation (5).
And impedance Z2 alone. Here, assuming that the rail impedance per unit length is constant, the impedance Z1 is the distance L between the position of the train 6 and the second power receiving point 5b.
1, the impedance Z2 is determined by the distance L2 between the first power receiving point 5a and the second power receiving point 5b, the specific voltage Kv is determined by the distance L1 and the distance L2 as shown by the equation (5), and the like. Factor is not included.

[0016]

(Equation 2)

When the train 6 is far away from the second receiving point 5b and L1≫L2, the specific voltage Kv expressed by the equation (5) is obtained.
Is Kv = 1 regardless of the transmission output fluctuation of the transmitter 1 or the leakage fluctuation of the track circuit 1T. Train 6 is the second receiving point 5b
, The relationship of L1≫L2 begins to collapse,
The specific voltage Kv gradually decreases as shown in the train detection characteristic diagram of FIG. 3, and when the train 6 reaches the second power receiving point 5b, the specific voltage Kv
v becomes Kv = 0. By detecting the change in the specific voltage Kv, it is possible to detect that the train 6 has reached the boundary of the track circuit 1T.

Therefore, the divider 42 of the receiver 4 provided at the receiving end 5 of the track circuit 1T on the entry side of the train 6 receives the voltage V1 detected at the first receiving point 5a sent to the bandpass filter 41a.
And the specific voltage Kv of the voltage V2 detected at the second receiving point 5b =
V2 / V1 is calculated and sent to the specific voltage determination unit 43. As shown in FIG. 3, the specific voltage determining unit 43 compares the sequentially transmitted specific voltage Kv with a predetermined threshold Th,
When the specific voltage Kv reaches the threshold value Th, it is determined that the position of the train 6 has reached the target train approach position L, and the arithmetic unit 4
5, a signal indicating that the train has reached the approach point of the track circuit 1T is sent. On the other hand, the signal determination unit 44 determines the attenuation of the reception level of the voltage V2 detected at the second reception point 5b, and
When the reception level of No. 2 is constantly attenuated to a certain extent from the reception level, it is determined that the train 6 has entered the track circuit 1T, and a train entry signal is sent to the calculation unit 45. When a signal indicating that the train has reached the approaching point of the track circuit 1T and the train entry signal are sent, the arithmetic unit 45 controls the track relay 9 by the logical product of the two signals to determine that there is a train in the track circuit 1T. .

As described above, the fact that the train 6 has reached the boundary of the track circuit 1T indicates that the distance L1 between the position of the train 6 and the second power receiving point 5b, the first power receiving point 5a, and the second power receiving point 5b. Distance L
2 is used to detect the change in the value of the specific voltage Kv, which is determined by the change in the output of the transmitter 1 or the change in the output of the transmitter 1 or the change of the track circuit 1T from the transmission end 2 to the reception end 5. Can be detected without being affected by the fluctuation of the reception level due to the above, and the detection error can be extremely reduced.

When the first power receiving point 5a is in a failure state such as open and the voltage V1 cannot be detected, the specific voltage K
Since v becomes infinite and changes greatly from the normal level,
By confirming the value of the specific voltage Kv, the first receiving point 5
The failure state of “a” can also be detected. Further, when the second power receiving point 5b is in a failure state such as an open state and the voltage V2 cannot be detected, the specific voltage Kv becomes “0” and the operation can be performed on the safe side.

[0021]

As described above, according to the present invention, it is determined that the train has reached the boundary of the track circuit, the distance between the train, the second receiving point, the first receiving point and the second receiving point. Is detected by a change in the value of the specific voltage Kv determined by the distance of
It is possible to detect that the train has reached the boundary of the track circuit without being affected by the output fluctuation of the transmitter or the fluctuation of the reception level by the track circuit from the transmitting end to the receiving end, and to minimize the detection error. it can.

Further, since the boundary detection characteristic for detecting that the train has reached the boundary of the track circuit is irrelevant to the leakage fluctuation of the track circuit, a track circuit having a long control distance can be configured.

Further, a failure or the like can be easily determined by checking the specific voltage Kv.

[Brief description of the drawings]

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

FIG. 2 is an explanatory view of the arrangement of the embodiment.

FIG. 3 is a train detection characteristic diagram of the embodiment.

FIG. 4 is a configuration diagram of a conventional example.

FIG. 5 is a diagram of a conventional train detection characteristic.

[Explanation of symbols]

 Reference Signs List 1T track circuit 1 transmitter 2 transmitter 4 receiver 5 receiver 5a first power receiving point 5b second power receiving point 6 train 9 track relay 42 divider 43 specific voltage discriminator 44 signal discriminator 45 calculator

Claims (1)

(57) [Claims] 1. A transmitter for transmitting electric power to a transmitting end of a track circuit on a train exit side boundary point, and two power receiving points provided at a slight distance from a receiving end of the track circuit on a train entrance side. And a receiver for detecting the presence or absence of a train from the voltage at each power receiving point. The receiver calculates a specific voltage Kv = V2 / V1 between the voltage V1 at the first power receiving point and the second power receiving point V2. , The calculated specific voltage K
A non-insulated track circuit device which detects that a train has reached a track circuit boundary by v.