JPH1059180A - Track short circuit detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a track short circuit detection device in which a short circuit condition between a pair of rails can be detected on a train. SOLUTION: Antennas 11, 12 are provided at corresponding positions to rails 1A, 1B at a lower part of a tip of a train T, and currents flowing to the antennas 11, 12 are added by an adder 13. Antennas 21, 22 are provided at corresponding positions to the rails 1A, 1B at a lower part of a back end of the train T, and currents flowing to the antennas 21, 22 are added by an adder 23. A first and a second detection signals S1, S2 outputted from the adders 13, 23 pass zone filters 31, 32 of an operation circuit 30, so respective signal levels are operated by level operation circuits 33, 34. A comparing and determining circuit 35 compares operation results X, Y of the level operation circuits 33, 34, and determines a short circuit condition between the rails 1A, 1B based on result of comparison.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a track short-circuit detecting device for detecting a short-circuit state between a pair of rails caused by an axle of a train on a train.

[0002]

2. Description of the Related Art Generally, when controlling a railway signaling device or a point switch device, a track circuit using a pair of rails in a closed section as a part of an electric circuit is widely used for detecting a train. ing. In this track circuit, taking advantage of the fact that the two rails are electrically short-circuited by the train and the power sent from one end of the track circuit does not reach the other end,
Detect trains in closed sections.

[0003] As shown in Fig. 4, the two rails are short-circuited by an axle portion composed of a train wheel and an axle.
The short-circuit resistance of the train at this time is made up of the contact resistance Rk of the tread at two places between the rail and each wheel and the resistance Ra of the axle, and most of the resistance is the contact resistance Rk of the tread.

[0004]

The short-circuit state between the rails caused by the train varies depending on the train length (number of axles), weight, running state, tread state, and the like. There is a possibility that short-circuit failure may occur. For example,
In a short train such as an inspection car for inspecting signal equipment, short-circuit resistance tends to increase because the axle is small and the weight is relatively light. If a short-circuit between the rails occurs, the railroad circuit indicates that there is no train despite the presence of the train in the closed section. It is a problem.

In the past, in many cases, trains and the like were simply designed in consideration of changes in the short-circuit resistance of the train so that short-circuits would not occur. Therefore, even if a short-circuit fault occurs, the state cannot be directly detected, and the short-circuit fault occurs based on a malfunction of the railway signal device or the point device detected on the ground side or the like. I had to judge.

The present invention has been made in view of the above points, and has as its object to provide a track short-circuit detecting device capable of detecting a short-circuit state between rails on a train.

[0007]

According to the present invention, a short-circuit state is detected on a train when a pair of rails are electrically short-circuited by an axle portion of the train. A short-circuit detecting device for detecting a short-circuit, wherein the first current is provided on the train in front of the axle portion so as to face the pair of rails, and generates a first detection signal according to a current flowing through the pair of rails. Detecting means, a second current detecting means provided opposite to the pair of rails on the train behind the axle, and generating a second detection signal according to a current flowing through the pair of rails; Calculating means for determining a short-circuit state between the pair of rails based on the first detection signal and the second detection signal.

According to this configuration, the first current detecting means detects the current flowing on the rail located forward of the axle, and the second current detecting means detects the current flowing on the rail located behind the axle. You. Based on the detection results of the first and second current detecting means, the short circuit state is determined by the calculating means, and the short circuit state between the pair of rails on the train is detected.

According to a second aspect of the present invention, in the first aspect of the present invention, the operation means includes a first level operation section for obtaining a level of the first detection signal, and a first level operation section for obtaining a level of the second detection signal. The second level operation unit to be obtained is compared with the operation result of the first level operation unit and the operation result of the second level operation unit, and the level of the first detection signal is higher than the level of the second detection signal. And a comparing and judging unit for judging that the pair of rails is normally short-circuited when larger than a preset threshold value.

According to this configuration, the determination of the short-circuit state between the pair of rails performed by the calculating means is performed based on the level difference between the first and second detection signals. According to a third aspect of the present invention, as a specific configuration of the first or second aspect of the present invention, the first current detecting means is provided to face each of the pair of rails, and A first antenna and a second antenna that generate signals of the same polarity with respect to currents flowing in different directions, and a signal generated by the first antenna and a signal generated by the second antenna are added to form the first antenna. And a first adder for generating a detection signal.

According to this configuration, in the first current detecting means, signals having the same polarity are generated in the first and second antennas with respect to the current flowing in the pair of rails in different directions, and the signals are subjected to the first addition. The first detection signal is added by the section. On the other hand, for currents flowing in the same direction on the pair of rails, signals of different polarities are generated in the first and second antennas, and these signals are canceled by the first adder.

According to the fourth aspect of the invention, the first to third aspects are provided.
As a specific configuration of the invention according to any one of the above, the second current detecting means is provided to be opposed to the pair of rails, respectively, and is the same for currents flowing through the pair of rails in different directions. A third antenna and a fourth antenna that generate a polarity signal, and a second addition unit that adds the signal generated by the third antenna and the signal generated by the fourth antenna to generate the second detection signal And is provided.

According to this configuration, in the second current detecting means, signals having the same polarity are generated in the third and fourth antennas with respect to the current flowing in the pair of rails in different directions, and these signals are subjected to the second addition. The second detection signal is added by the second detection signal. On the other hand, for currents flowing in the same direction on the pair of rails, signals of different polarities are generated in the third and fourth antennas, and these signals are canceled by the second adder.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram illustrating the configuration of the track short-circuit detection device according to the present embodiment. Also, FIG.
It is a side view of the train to which this track short circuit detection device was attached. In the figure, the track short-circuit detecting device is a front axle 2A.
A first power receiving unit 10 as first current detecting means attached to a lower part of the front end of the train T located further forward, and a rear axle 2
A second power receiving unit 20 as a second current detecting means attached to the lower rear end of the train T located behind B, and a pair of signals from the first power receiving unit 10 and the second power receiving unit 20, And an arithmetic circuit 30 as arithmetic means for determining a short-circuit state between the rails 1A and 1B.

The first power receiving unit 10 is located at the lower end of the train T.
And a first antenna provided to face the rail 1A.
Antenna 11 and the rail 1B.
An antenna 12 as a second antenna, and antennas 11 and 12
Adder 13 as a first adder for adding the current generated in
And Antennas 11 and 12 each have a rail 1
A, 1B electromagnetically coupled with the magnetic field generated by the current flowing through
Current I_1A, I_1BOccurs. The antenna 11 is, for example,
Current for the current flowing in the rail 1A in the direction a (FIG. 1)
I_1AAntenna 12 has a polarity such that
Current I in the direction b in FIG._1B
Has a polarity such that is positive. The adder 13 is an antenna
Current I from 11,12_1A, I _1BDetection signal S obtained by adding
₁Is output to the arithmetic circuit 30. Antenna 11,1 as above
2 and set the current I_1A, I_1BAdd
As a result, the rails 1A and 1B flow in the same direction.
The current components generated in the antennas 11 and 12 by the train current
It is canceled by the adder 13 and the rails 1A and 1B flow in the opposite directions.
Current components generated in antennas 11 and 12 due to orbital currents
Are added by the adder 13, the first detection according to the orbital current is performed.
Knowledge signal S₁Is output from the adder 13.

The second power receiving unit 20 is located at the lower rear end of the train T.
Like the first power receiving unit 10, the power receiving unit 10 is installed facing the rail 1A.
The antenna 21 as the third antenna that has been
Antenna as a fourth antenna provided opposite to B
Antenna 22 and a second adder for adding the current flowing through the antennas 21 and 22.
And an adder 23 as a calculation unit. Antennas 21 and 22 are
Caused by currents flowing through rails 1A and 1B, respectively
The current I_2A, I_2BCausing the antenna
The polarity of each antenna 21,22 is set as well as the polarity of 11,12
Is done. The adder 23 outputs the current I from the antennas 21 and 22. _2A,
I_2BIs added to the second detection signal S_TwoIs output to the arithmetic circuit 30.
You.

The arithmetic circuit 30 receives the _first and second detection signals S ₁ and S ₂ output from the first and second power receiving units 10 and 20, and outputs only a signal component of a predetermined frequency. 32
And a level operation circuit 33 as a first level operation unit for receiving a signal from the bandpass filter 31 and obtaining the signal level thereof
And a level operation circuit 34 as a second level operation unit for receiving a signal from the bandpass filter 32 and obtaining the signal level.
And the operation result X of the level operation circuit 33 and the level operation circuit 34
Is compared with the operation result Y of the rail 1 as described later.
And a comparison / determination circuit 35 as a comparison / determination unit for determining a short-circuit state between A and 1B.

The bandpass filters 31 and 32 filter out only signal components substantially equal to the frequency of the orbital current from the input signal in order to remove noise components other than the orbital current included in the _first and second detection signals S ₁ and S _2. A separately output bandpass filter is used. Comparison and determination circuit 35, the rail 1A, in order to determine the short-circuit state between the rails when the inter 1B is shorted second detection signal S ₂ levels on the basis that is smaller than the level of the first detection signals S ₁ For example, a value (X-α) obtained by subtracting a constant α from the calculation result X indicating the level of the first detection signal S ₁
And the calculation result Y indicating the level of the second detection signal S ₂ , it is determined that the short circuit is normal when Y ≦ X−α, and the short circuit is determined when X−α <Y. It is determined to be defective. However, the constant alpha, which can be determined a short circuit condition between the rail and the normal is a constant previously set as the minimum value of the second level difference of the detection signal S ₂ to the first detection signal S _1.

Next, the operation of this embodiment will be described with reference to FIG. In FIG. 3, when the train T enters the closed section 5, the rails 1 </ b> A and 1 </ b> B of the closed section 5 are connected via the axle section 2 of the train T. This axle 2
Specifically, the front axle 2A and the wheels 3A at both ends thereof,
It consists of a rear axle 2B and wheels 3B at both ends of the rear axle.

When the rails are normally short-circuited by the axle portion 2 of the train T, the rails 1A and 1B located forward of the front axle 2A and the wheels 3A in the traveling direction of the train as shown by solid arrows in the figure. Orbit current flows through the rear axle 2B
And almost no track current flows on the rails 1A, 1B located behind the wheels 3B in the traveling direction of the train. As a result, the antennas 11 and 12 of the first power receiving unit 10 have the rail 1
A current corresponding to the orbital current flowing through A and 1B is generated, and the first detection signal S ₁ having a large signal level is output from the adder 13 to the arithmetic circuit 30. On the other hand, hardly occurs current on the antenna 21, 22 of the second power receiving portion 20, the second detection signal S ₂ of level output from the adder 23 becomes substantially zero. And
After the first and second detection signals S ₁ and S ₂ are sent to the operation circuit 30 and the noise components are removed by the bandpass filters 31 and 32, the level of each signal is calculated by the level calculation circuits 33 and 34, The calculation results X and Y are sent to the comparison determination circuit 35. The comparison determination circuit 35 compares the value (X−α) with the magnitude of Y. In this case, Y ≦ X−α, and it is determined that the short-circuit state between the rails is normal. This comparison judgment circuit 35
Is displayed, for example, on a monitor (not shown) provided near the driver's seat of the train T, so that the occupant is notified of the normal short-circuit state between the rails.

On the other hand, when the short-circuit resistance of the axle portion 2 of the train T increases and a short-circuit failure occurs, the track current flows through the rails 1A and 1B located forward of the front axle 2A and the wheels 3A, and Track currents also flow through the rails 1A and 1B located behind the side axle 2B and the wheels 3B, as indicated by broken-line arrows in the figure leaked without being short-circuited by the axle portion 2. The antennas 11 and 12 of the first power receiving unit 10 and the second
The antennas 21 and 22 of the power receiving unit 20 have rails 1A,
A current corresponding to the orbital current flowing through 1B is generated and the adder 1
The first and second detection signals S ₁ , S ₂ are output to the arithmetic circuit 30 from 3, 23. Then, the first and second detection signals S ₁ and S ₂ pass through band filters 31 and 32, respectively, and level operation circuits 33 and 34, respectively.
After the level of each signal is calculated in the above, the calculation results X and Y
Is sent to the comparison determination circuit 35. Then, the comparison judgment circuit 35
And the magnitude of the value (X-α) is compared with Y. In this case, X
−α <Y, and it is determined that a short circuit has occurred. This determination result is displayed on a monitor or the like, and an occupant is warned of the occurrence of a short circuit failure. The occupant who knows the occurrence of the short-circuit failure takes measures to control the train to prevent a rear-end collision or the like, and to reduce the short-circuit resistance by forcibly polishing the tread surface of the rail.

As described above, according to this embodiment, the first and second power receiving units 10 and 20 are provided before and after the train T, and the track current flowing through the rail is detected by the first and second power receiving units 10 and 20. By determining the short-circuit state in the arithmetic circuit 30 based on the detection result, it is possible to detect the short-circuit state between the rails due to the axle 2 of the train T on the train T. Even in the case of occurrence, it is possible to take quick measures on the train T side and improve the safety of train operation. Further, the first power receiving unit 10 is connected to the antennas 11 and 12 and the adder 13.
And the second power receiving unit 20 includes antennas 21 and 22 and an adder 23.
With this configuration, each power receiving unit outputs a signal corresponding to the track current flowing in the opposite direction without being affected by the train current flowing in the same direction on the rail, so that the short-circuit state between the rails can be detected more reliably. It is possible to

In the above-described embodiment, the power receiving unit as the current detecting means is configured to add the output of the antenna that generates a current of the same polarity with respect to the current flowing in the opposite direction to the rail by the adder. However, the current detecting means of the present invention is not limited to this, and, for example, a configuration for obtaining a difference between outputs of an antenna that generates a current of the same polarity with respect to a current flowing in the same direction on the rail can be of course. Also,
As the current detecting means, it is also possible to apply the present device using a power receiving device (vehicle armature) used in a conventional ATC or ATS on-vehicle device.

[0024]

As described above, according to the first and second aspects of the present invention, the first and second current detecting means are provided on the train to detect the current flowing through the pair of rails before and after the train. Since the first and second current detecting means detect the short-circuit state between the rails by the calculating means, the short-circuit state between the rails can be detected on the train. Even if a defect occurs, a quick action can be taken on the train side, and the safety of train operation can be improved.

According to the third and fourth aspects of the present invention,
In addition to the effects of the invention described in 2, an antenna is provided as the first and second current detecting means for generating signals of the same polarity with respect to currents flowing in a pair of rails in different directions. Since the addition is performed by the addition unit, the first and second current detection units output a signal corresponding to the track current without being affected by the train current flowing through the pair of rails. Detection can be performed more reliably.

[Brief description of the drawings]

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

FIG. 2 is a front view showing the appearance of the train of the embodiment.

FIG. 3 is a diagram illustrating an operation of the embodiment.

FIG. 4 is a diagram illustrating a short circuit between rails due to an axle portion of a train.

[Explanation of symbols]

 T train 1A, 1B rail 2 axle 2A, 2B axle 3A, 3B wheels 10 1st power receiving section 20 2nd power receiving section 11,12,21,22 antenna 13,23 adder 30 arithmetic circuit 31,32 band filter 33, 34 Level operation circuit 35 Comparison judgment circuit

Claims (4)

[Claims] 1. A track short-circuit detecting device for detecting a short-circuit condition on a train when a pair of rails is electrically short-circuited by an axle portion of the train, the device comprising: A first current detection unit that is provided to face the pair of rails and generates a first detection signal according to a current flowing through the pair of rails; and faces the pair of rails on the train behind the axle unit. And a second current detection means for generating a second detection signal according to a current flowing through the pair of rails, and between the pair of rails based on the first detection signal and the second detection signal. An orbit short-circuit detecting device comprising: a calculating means for determining a short-circuit state. 2. An arithmetic unit comprising: a first level calculator for calculating a level of the first detection signal; a second level calculator for determining a level of the second detection signal; and a calculation of the first level calculator. A result is compared with a calculation result of the second level calculation unit, and when the level of the first detection signal is higher than the level of the second detection signal by a predetermined threshold value or more, the distance between the pair of rails is normal. 2. The track short-circuit detecting device according to claim 1, further comprising: a comparison determining unit that determines that the track is short-circuited. 3. The first antenna according to claim 1, wherein said first current detecting means is provided opposite to each of said pair of rails, and generates a signal of the same polarity with respect to current flowing through said pair of rails in different directions. Two antennas, a first addition unit that adds the signal generated by the first antenna and the signal generated by the second antenna to generate the first detection signal,
3. The apparatus according to claim 1, wherein
The track short-circuit detection device according to the above. 4. A third antenna, wherein the second current detecting means is provided opposite to each of the pair of rails, and generates a signal having the same polarity with respect to currents flowing through the pair of rails in different directions. A fourth antenna, a second addition unit that adds the signal generated by the third antenna and the signal generated by the fourth antenna to generate the second detection signal,
The track short-circuit detecting device according to any one of claims 1 to 3, further comprising: