JP5443541B2 - Incompatibility detection device - Google Patents

Description

  The present invention relates to an intrusion detection device that detects occurrence of intrusion of a cable.

  In a train detection system that uses a track circuit, an intrusion detection device that detects incompatibility between a transmission core wire and a reception core wire of a cable is used.

  FIG. 9 is a diagram illustrating an example of a conventional contact detection device 40. In the train detection system, a cable 56 is connected to each of a transmission end and a reception end of a plurality of closed sections nT (n = 1, 2,...) Obtained by electrically isolating tracks (rails). A transmitter 52 and a receiver 54 are connected to 56 through a transmission protector 53 and a reception protector 55. The transmission protector 53 and the reception protector 55 are matching transformers for matching the characteristic impedance between the transmitter 52 and the receiver 54 and the cable 56.

  The contact detection device 40 is a device that detects the occurrence of contact between the cables 56 related to transmission and reception, and includes a DC power supply 41 and a contact detection relay 42. The DC power supply 41 applies a DC voltage (detection signal) to the neutral point of each of the transmission protector 53 and the reception protector 55. When the cable 56 is not in contact, the detection current does not flow and the contact detection relay 42 is dropped. However, when the cable 56 is in contact, the detection current flows and the contact detection relay 42 is raised. To do. Generation | occurrence | production of a touch is detected by the operation | movement (top) of this touch detection relay 42. FIG. An example of such a conventional touch detection device is disclosed in Patent Document 1, for example.

Japanese Patent No. 4467991

Since the conventional intrusion detector has a single-system configuration, it cannot perform intrusion detection at the time of a failure and has low reliability. In a railway, a redundant configuration is desired from the viewpoint of reliability.
This invention is made | formed in view of the said situation, The place made into the objective is to implement | achieve the intrusion detection apparatus of a dual type | system | group structure.

The first form for solving the above problem is
A voltage is applied between the first neutral point of the first transformer to which the first cable is connected and the second neutral point of the second transformer to which the second cable is connected, and the first and An intrusion detection device (for example, the intrusion detection device 100 in FIG. 1) that detects the occurrence of intrusion between the second cables,
AC signal generating means (for example, the oscillation unit 10 in FIG. 1) for generating an AC signal;
Two contact detection circuits (for example, the contact detection circuits 20-1 and 20-2 in FIG. 1) connected in parallel;
Comprising
Each of the contact detection circuits is
Half-wave rectification means (for example, the detector 21 in FIG. 1) for half-wave rectifying the AC signal;
Applying means for applying the half-wave rectified pulsating voltage as a detection voltage between the first and second neutral points (for example, the insulation transformer 22 in FIG. 1);
Current detection means (for example, current detectors CT1 and CT2 in FIG. 2) for detecting a current flowing between the first and second neutral points;
Detection means (for example, the control unit 24 in FIG. 1) for detecting the occurrence of contact based on the current detected by the current detection means;
With
The half-wave rectifiers of the two intrusion detection circuits are configured such that the AC signals are input so as to have opposite polarities, and the intimacy detection circuit sequentially operates according to the polarity of the AC signals. This is a characteristic touch detection device.

  According to the first embodiment, it is possible to realize a double-contact configuration touch detection device in which each of the two touch detection circuits independently performs touch detection. Thereby, the improvement of the reliability of a tactile detection can be aimed at. Specifically, each of the two intrusion detection circuits applies a pulsating voltage obtained by half-wave rectifying an AC signal as a detection signal between the first and second neutral points, and the first and second neutral points. The occurrence of contact is detected based on the current flowing between the points. Since the AC signal is input to each of the tactile detection circuits so that the polarities are opposite to each other, the two tactile detection circuits alternately apply the detection signals to perform the tactile detection according to the polarity of the AC signal. Become.

Further, as a second form, the first embodiment of the intrusion detection device,
Each of the contact detection circuits is
A first signal line connected to the first neutral point (eg, signal line 31 in FIG. 1);
A second signal line (eg, signal line 32 of FIG. 1) connected to the second neutral point;
A short-circuit switch (for example, switch SW3 in FIG. 2) for short-circuiting the first signal line and the second signal line;
And further comprising
The application means applies the detection voltage between the first signal line and the second signal line,
The current detection means detects a current flowing through the first signal line or the second signal line between the short-circuit switch and the application means;
Furthermore,
First short-circuiting the short-circuit switch, the first self-checking means (for example, the control unit 24 of FIG. 1) for self-checking the normal circuit operation based on the detection current of the current detection means during that time,
You may comprise an intrusion detection apparatus.

  According to the second aspect, the short-circuit switch that short-circuits the first signal line connected to the first neutral point and the second signal line connected to the second neutral point is temporarily provided. Based on the current flowing through the first or second signal line between the short-circuit switch at that time and the detection voltage applying means, self-check of normal circuit operation is performed. If the intrusion detection circuit is normal, the current flowing in the first and second signal lines when the first and second signal lines are short-circuited should be a current corresponding to the applied detection voltage. By detecting this current (current flow), it is possible to check whether the intrusion detection circuit is operating normally, thereby further improving the reliability of the intrusion detection device.

Further, as a third form, the first embodiment of the mixed touch detection device,
Each of the contact detection circuits is
A first signal line connected to the first neutral point (eg, signal line 31 in FIG. 1);
A second signal line (eg, signal line 32 of FIG. 1) connected to the second neutral point;
A short-circuit switch (for example, switch SW3 in FIG. 2) for short-circuiting the first signal line and the second signal line;
An open switch (for example, switch SW1 in FIG. 2) that opens at least one of the first signal line and the second signal line between the short-circuit switch and the applying unit;
And further comprising
The application means applies the detection voltage between the first signal line and the second signal line,
The current detection means detects a current flowing through the first signal line or the second signal line between the short-circuit switch and the neutral point;
Furthermore,
While the application means of the other intrusion detection circuit applies the detection voltage, the short-circuit switch is temporarily short-circuited and the open switch is temporarily opened, and the current detection means detects a current detected therebetween. Based on the second self-checking means (for example, the control unit 24 of FIG. 1) for self-checking the normal circuit operation of the self-mixing detection circuit based on,
You may comprise an intrusion detection apparatus.

  According to the third aspect, the short-circuit switch for short-circuiting the first and second signal lines is temporarily provided while the other tactile detection circuit applies the detection signal to the first and second signal lines. In addition to short-circuiting, an open switch that opens at least one of the first signal line and the second signal line between the short-circuit switch and the detection voltage application unit is temporarily opened. Based on the current flowing between the first signal line and the second signal line between the points, self-check of normal circuit operation is performed. If the incompatibility detection circuit is normal, the first and second signal lines are short-circuited, and when the applying means and the short-circuit switch are opened, the other incompatibility is applied to the first and second signal lines. A current corresponding to the detection voltage applied by the detection circuit should flow. By detecting this current (current flow), it is possible to check whether the intrusion detection circuit is operating normally, thereby further improving the reliability of the intrusion detection device.

Moreover, as a 4th form, it is the intrusion detection apparatus of a 1st form,
Each of the contact detection circuits is
A first signal line connected to the first neutral point (eg, signal line 31 in FIG. 1);
A second signal line (eg, signal line 32 of FIG. 1) connected to the second neutral point;
A short-circuit switch (for example, switch SW3 in FIG. 2) for short-circuiting the first signal line and the second signal line;
An open switch (for example, switch SW1 in FIG. 2) that opens at least one of the first signal line and the second signal line between the short-circuit switch and the applying unit;
And further comprising
The application means applies the detection voltage between the first signal line and the second signal line,
The current detection means includes a first current detector (for example, CT1 in FIG. 2) that detects a current flowing through the first signal line or the second signal line between the short-circuit switch and the application means. A second current detector (for example, current detector CT2 in FIG. 2) for detecting a current flowing through the first signal line or the second signal line between the short-circuit switch and the neutral point. Have
Furthermore,
First self-checking means (for example, the control unit 24 in FIG. 1) that temporarily short-circuits the short-circuit switch and self-checks a normal circuit operation based on a detection current of the first current detector during that time. ,
While the application means of the other intrusion detection circuit applies the detection voltage, the short-circuit switch is temporarily short-circuited and the open switch is temporarily opened, while the second current detector A second self-checking means (for example, the control unit 24 in FIG. 1) for self-checking the normal circuit operation of the self-tactile detection circuit based on the detected current;
You may comprise the intrusion detection apparatus provided with.

  According to the fourth embodiment, it is possible to realize a tactile detection device having the functions of both the second embodiment and the third embodiment.

Further, as a fifth embodiment, the fourth aspect of the tactile detection device,
The two contact detection circuits cause the detection means, the first self-checking means, and the second self-checking means to function sequentially and sequentially in a predetermined order, and the second self-checking About the means, when the detection means of the other mixed contact detection circuit is functioning,
You may comprise an intrusion detection apparatus.

  According to the fifth embodiment, the two touch detection circuits periodically perform the touch detection, the first self-check, and the second self-check in a predetermined order, and the second self-check is This is performed when the other contact detection circuit detects the occurrence of contact.

In addition, as a sixth form, there is a mixed touch detection device of any of the first to fifth forms,
The AC signal generation means has two oscillation units (for example, the oscillation units 10-1 and 10-2 in FIG. 1),
One oscillating unit checking means (for example, the control unit 24 in FIG. 1) for determining normal operation of the one oscillating unit based on the oscillation signal of the one oscillating unit;
The other oscillating unit checking means (for example, the control unit 24 in FIG. 1) for determining the normal operation of the other oscillating unit based on the oscillation signal of the other oscillating unit;
Based on the check result of the one oscillating unit checking means and the check result of the other oscillating unit checking means, the oscillating unit that generates an alternating current input to the two intrusion detection circuits is switched to one of the two oscillating units. Switching means (for example, the oscillation switching unit 12 in FIG. 1);
Further comprising
You may comprise an intrusion detection apparatus.

  According to the sixth aspect, the tactile detection device includes two oscillating units that generate AC signals, determines normal operation of each oscillating unit, and inputs the two tactile detection circuits based on the determination result. The oscillation unit that generates an alternating current can be switched. Thereby, since the oscillation part can be made into a double structure, further improvement in reliability can be achieved.

The block diagram of a tactile detection apparatus. The circuit block diagram of a verification switching part. The connection diagram of the check switching part in a mixed contact detection operation | movement. The connection diagram of the check switching part in the first self-check. The connection diagram of the check switching part in the second self-check. The wave form diagram of each part of the mixture detection circuit in a mixture detection operation | movement. The wave form diagram of each part of the mixed contact detection circuit in self-checking operation | movement. Explanatory drawing of the whole process of a mixture detection apparatus. The block diagram of the conventional incompatibility detector.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the applicable embodiment of the present invention is not limited to this.

[Constitution]
FIG. 1 is a configuration diagram of a tactile detection device 100 in the present embodiment. This intrusion detection apparatus 100 is an apparatus for detecting the occurrence of incompatibility between cables related to transmission / reception connected to a track circuit nT used in, for example, a train detection system, and includes a transmission protector 53 and a reception protector 55. By applying a detection signal between the two signal lines 31 and 32 connected to the sex point, the occurrence of incompatibility is detected. That is, as a whole, the occurrence detection of the touch is the same as the conventional touch detection device. In FIG. 1, only one track circuit (1T) is shown, but a plurality of track circuits nT (n = 1, 2,...) Are similarly configured and installed.

  The intrusion detection apparatus 100 includes two oscillation units 10-1 and 10-2, an oscillation switching unit 12, and two intrusion detection circuits 20-1 and 20-2. In addition, since the touch detection circuit 20-2 has the same configuration as the touch detection circuit 20-1, it is illustrated in a simplified manner.

  The oscillating units 10-1 and 10-2 have the same configuration, and convert the commercial power supply into an oscillation signal (AC signal) having a predetermined frequency and a predetermined voltage, and output it. Although the oscillation frequency can be set arbitrarily, for example, about 20 to 100 Hz is assumed.

  The oscillation switching unit 12 applies the oscillation signal input to each of the tactile detection circuits 20-1 and 20-2 according to the operating state (upward / falling) of the level detection relay 27 of each of the tactile detection circuits 20-1 and 20-2. The oscillation signal is switched to one of the oscillation units 10-1 and 10-2. That is, one of the two oscillating units 10-1 and 10-2 (for example, the oscillating unit 10-1) is used as a main system, and the oscillation signal of the main oscillating unit 10 is usually used as the contact detection circuit 20 1 and 20-2. When the level detection relay 27 that monitors the signal level of the main oscillation unit 10 is dropped, the oscillation signal input to each of the contact detection circuits 20-1 and 20-2 is transferred to the other (for example, the oscillation unit). Switch to the oscillation signal of 10-2). At this time, the oscillation signals input to the tactile detection circuits 20-1 and 20-2 are input so as to have opposite polarities.

  The intrusion detection circuits 20-1 and 20-2 include a detection unit 21, an insulation transformer 22, an inspection switching unit 23, a control unit 24, an incompatibility detection relay 25, an inspection relay 26, and a level detection relay 27. have.

  The detection unit 21 is configured to include, for example, a diode, and allows only the positive signal to pass through the input oscillation signal. Here, the oscillation signals input to the respective tactile detection circuits 20-1 and 20-2 are signals having opposite polarities. For this reason, in each of the contact detection circuits 20-1 and 20-2, the output signals of the detection unit 21 have signal waveforms that are shifted from each other by a half cycle.

  The insulation transformer 22 is applied with the output signal (half-wave rectified signal) of the detector 21 on the primary side, and a voltage corresponding to the applied voltage is generated on the secondary side. The generated voltage on the secondary side becomes a half-wave pulsation voltage, which is applied as a detection signal (detection voltage) between the signal lines 31 and 32 via the verification switching unit 23.

  The check switching unit 23 is a circuit for performing self-check to determine whether or not the touch detection circuit 20 is normal. As shown in FIG. 2, three switches SW1 to SW3 and two current detectors are used. It has CT1 and CT2. The switches SW1 and SW2 are provided between the insulation transformer 22 and the signal line 31, and connect / open between the insulation transformer 22 and the signal line 31. The switch SW3 is provided between the signal lines 31 and 32, and shorts / opens between the signal lines 31 and 32. The current detectors CT1 and CT2 are provided between the insulation transformer 22 and the signal line 31, and detect currents flowing through the switches SW1 and SW2, respectively. The switches SW <b> 1 to SW <b> 3 are controlled to open and close in accordance with a control signal from the control unit 24, and currents detected by the current detectors CT <b> 1 and CT <b> 2 are input to the control unit 24. Although the switches SW1 and SW2 and the current detectors CT1 and CT2 are illustrated and described as being provided on the signal line 31, they may be provided on the signal line 32.

  The control unit 24 repeatedly executes a contact detection operation for detecting the occurrence of contact between the cables 56 for transmission and reception and a self-check operation for self-checking whether the contact detection circuit 20 is normal at predetermined time intervals.

  In the contact detection operation, as shown in FIG. 3, in the verification switching unit 23, the switches SW1 and SW2 are turned on (closed) and the switch SW3 is turned off (open). In this state, the detection signal (detection voltage) is applied between the signal lines 31 and 32 through the verification switching unit 23. When no contact occurs, no current flows through the signal lines 31 and 32. On the other hand, when contact occurs, a current (detection current) corresponding to the applied detection signal flows through the signal lines 31 and 32.

  Therefore, the control unit 24 determines “no contact” if the detected currents by the current detectors CT1 and CT2 are less than the specified value, and determines “not mixed” if the detected current is equal to or greater than the specified value. When it is determined that “there is contact”, the contact detection relay 25 is dropped and the occurrence of contact is externally output. At this time, the determination may be made by using both detection currents of the current detectors CT1 and CT2, or may be made by using one detection current.

  In the self-checking operation, it is determined whether or not there is a failure in the mixed touch detection circuit 20 by short-circuiting the inside of the check switching unit 23 and flowing a check current. In the present embodiment, two types of self-checking are performed: a first self-check and a second self-check.

  The first self-check is a check that simulates the state of “mixed”, and as shown in FIG. 4, in the check switching unit 23, the switches SW1 and SW3 are turned on (closed) and the switch SW2 is turned off (open). The signal lines 31 and 32 are short-circuited. In this state, in the verification switching unit 23, a verification current corresponding to the detection signal flows through a path that passes through the current detector CT1 and the switches SW2 and SW3. Accordingly, the control unit 24 determines that the intrusion detection circuit 20 is “normal (no abnormality)” if the current detected by the current detector CT1 is equal to or greater than the specified value, and determines “abnormal” if it is less than the specified value. If it is determined as “abnormal”, the check relay 26 is dropped and an abnormality occurrence is output to the outside.

  The second self-check is a check that simulates the state of “no contact”. As shown in FIG. 5, in the check switching unit 23, the switches SW2 and SW3 are turned on (closed) and the switch SW1 is turned off (open). The signal lines 31 and 32 are short-circuited and the insulation transformer 22 and the signal lines 31 and 32 are opened. This second self-examination is performed during a period during which the other touch detection circuit 20 is performing the touch detection operation (the touch detection period).

  That is, in the verification switching unit 23 of the other intrusion detection circuit 20, the switches SW1 and SW2 are on (closed) and the switch SW3 is off (open). , 32 is applied with a detection signal. In this state, in the verification switching unit 23, the verification current corresponding to the detection signal applied between the signal lines 31 and 32 on the path passing through the switches SW2 and SW3 and the current detector CT2 Flows. Accordingly, the control unit 24 determines that the intrusion detection circuit 20 is “normal (no abnormality)” if the current detected by the current detector CT2 is equal to or greater than the specified value, and determines “abnormal” if it is less than the specified value. . In this case, even if it is determined as “abnormal”, there is a possibility of failure of another system (the other mixed contact circuit 20), so the check relay 26 is maintained as it is.

The control unit 24 also monitors the output levels (oscillation signal levels) of the oscillation units 10-1 and 10-2. Specifically, the touch detection circuit 20-1 monitors the output level of the oscillation unit 10-1, and the touch detection circuit 20-2 monitors the output level of the oscillation unit 10-2. If the signal level (specifically, the effective value) of the oscillation signal output from the oscillating unit 10 is equal to or higher than a specified value, it is determined as “normal (no abnormality)”, and if it is lower than the specified value, it is determined as “abnormal” To do.
If it is determined as “abnormal”, the “level detection relay 27” is dropped, and the abnormality of the oscillation unit 10 is externally output to the oscillation switching unit 12.

[Operation]
The operation of the tactile detection device 100 will be described. Since the two touch detection circuits 20-1 and 20-2 perform similar operations in the touch detection device 100, the operation of one of the touch detection circuits 20 will be described here.

  FIG. 6 is a diagram illustrating signal waveforms of respective parts of the touch detection circuit 20 during the touch detection operation period (touch detection period). In FIG. 6, with the horizontal axis as time t, in order from the top, the oscillation signal output from the oscillating unit 10, the detected current (detected current) from one of the current detectors CT <b> 1, CT <b> 2, and the presence / absence of occurrence of contact by the control unit 24 The result of the determination, and the operation of the tactile detection relay 25 are shown.

  The period before time t1 is a period in which no contact has occurred. During this period, the detection current (contact current) does not flow, and the detection currents by the current detectors CT1 and CT2 are “zero”. Therefore, the control unit 24 determines “no contact”, and the contact detection relay 25 is on the lift.

  Subsequently, when contact occurs at time t1, a current (detection current) corresponding to the applied detection signal flows through the signal lines 31 and 32. This current (detected current) is detected by the current detectors CT1 and CT2. The control unit 24 determines that “there is contact” at time t2 when a state in which the currents detected by the current detectors CT1 and CT2 are equal to or greater than a specified value continues for a predetermined time. Furthermore, the contact detection relay 25 is dropped at time t3 when a predetermined time has elapsed from the time when it is determined that “there is contact”.

  FIG. 7 is a diagram showing signal waveforms of each part of the mixed contact detection circuit 20 during the self-checking operation period (self-checking period). In FIG. 7, the horizontal axis is time t, and from the oscillator 10 in order from the top. The oscillation signal to be output, the detection current (verification current) by the current detector CT1, the detection current (verification current) by the current detector CT2, the determination result of the presence / absence of contact by the control unit 24, and the determination result of self-check are shown in order. Yes. However, no contact has occurred.

  In FIG. 7, the period from time t11 to t15 is a self-checking period. Of this self-check period (time t11 to t15), the first half time period t11 to t13 is the first self-check period, and the second half time period t13 to t15 is the second self-check period. .

  First, in the first self-check period (time t11 to t13), the switches SW1 and SW3 of the check switching unit 23 are turned on (closed) and the switch SW2 is turned off (open) (see FIG. 4). For this reason, a verification current corresponding to the detection signal applied to the signal lines 31 and 32 flows in the verification switching unit 23, and this verification current is detected by the current detector CT1. Then, the control unit 24 determines that the first self-examination is “normal (no abnormality)” at time t12 when the state in which the current detected by the current detector CT1 is equal to or greater than the predetermined value continues for a predetermined time.

  Subsequently, in the second self-check period (time t13 to t15), the switches SW2 and SW3 of the check switching unit 23 are turned on (closed) and the switch SW1 is turned off (open) (see FIG. 5). Therefore, a verification current corresponding to the detection signal applied to the signal lines 31 and 32 by the other tactile detection circuit 20 flows in the verification switching unit 23, and this verification current is detected by the current detector CT2. Then, the control unit 24 determines that the second self-examination is “normal (no abnormality)” at time t14 when the state in which the current detected by the current detector CT2 is equal to or greater than the predetermined value continues for a predetermined time.

  In addition, the verification current in the second self-check is smaller than the check current in the first self-check. This is because in the contact detection circuit 20, a resistor R is provided at the subsequent stage of the verification switching unit 23.

  When the first and second continuous self-checks are completed, the control unit 24 determines the result of the self-check from the determination results of the first and second self-checks. That is, if both the first and second self-checks are determined to be “normal”, it is determined to be “normal (no abnormality)” as a result of the self-check.

[Process flow]
FIG. 8 is a diagram for explaining the entire process in the tactile detection device 100. In FIG. 8, the operation of the two tactile detection circuits 20-1 and 20-2 is shown with the horizontal axis as time t.

  Each of the contact detection circuits 20-1 and 20-2 repeatedly performs the three types of operations of the contact detection operation, the first self-check, and the second self-check in a predetermined order. The order of operation is determined such that when one of the touch detection circuits 20 is performing the touch detection operation, the other touch detection circuit 20 performs the second self-check.

  In the example shown in FIG. 8, one of the tactile detection circuits 20-1 performs the tactile detection operation, the first self-examination, and the second self-examination in this order, and the other tactile detection circuit 20-2 performs the second self-examination. The check, the first self-check, and the mixed touch detection operation are performed in this order. Therefore, in a certain period T, one of the tapping detection circuits 20-1 performs a tapping detection operation, and the other tapping detection circuit 20-2 performs a second self-check. In the next period T, both the contact detection circuits 20-1 and 20-2 perform the first self-check, and in the next period T, one of the contact detection circuits 20-1 performs the second self-check, The other touch detection circuit 20-2 performs the touch detection operation.

[Function and effect]
As described above, the touch detection device 100 of the present embodiment has a double system configuration including the two touch detection circuits 20-1 and 20-2 having the same configuration, and can improve the reliability of the touch detection. Oscillation signals output from the oscillating unit 10 are input to the intrusion detection circuits 20-1 and 20-2 so as to have opposite polarities, and operate alternately every half cycle of the oscillation signal.

  In addition, each of the touch detection circuits 20-1 and 20-2 repeatedly performs the touch detection operation and the self-checking operation for determining whether or not the touch detection circuit 20 is normal in a predetermined cycle. Reliability can be further improved. Furthermore, two oscillation units 10-1 and 10-2 are provided, and the oscillation signal of one oscillation unit 10 is normally input to the tactile detection circuits 20-1 and 20-2, and the output level of the oscillation unit 10 decreases. Then, since it switches to the other oscillation part 10, the further improvement of the reliability of the tactile sense detection apparatus 100 can be aimed at. The configuration for monitoring the oscillation unit 10 is incorporated in the tactile detection circuit 20. In other words, the intrusion detection circuit 20 has the same configuration for both the intrusion detection circuits 20-1 and 20-2 and has a configuration for monitoring the output level of one oscillation unit 10. The contact detection circuit 20-1 monitors the oscillation unit 10-1, and the contact detection circuit 20-2 monitors the oscillation unit 10-2. Therefore, including the function of monitoring the output level of the oscillating unit 10, the tactile detection circuits 20-1 and 20-2 have the same configuration.

[Modification]
It should be noted that embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can of course be changed as appropriate without departing from the spirit of the present invention.

(A) Oscillator 10
For example, in the above-described embodiment, the two oscillating units 10-1 and 10-2 are provided. However, if the reliability of the oscillating unit 10 is guaranteed, the number may be one.

(B) Types of operation of the tactile detection circuit 20 The operation performed by the tactile detection circuit 20 is classified into three types of operations, i.e., a tactile detection operation, a first self-examination, and a second self-examination. As described above, when the touch detection operation is performed, the other touch detection circuit 20 performs the second self-check. However, while the touch detection operation is performed, the other touch detection circuit may not perform self-checking. In that case, the touch detection circuit 20 performs a touch detection dummy operation in addition to the above-described three types of operations. Then, when one of the contact detection circuits 20 is performing the contact detection dummy operation, the other contact detection circuit 20 performs the second self-check. The touch detection dummy operation is the same operation as the touch detection operation, but the determination of the touch detection is invalidated and the occurrence of the touch is not determined, and the signal line 31, 2 is used for the second self-check of the opponent touch detection circuit 20. This is an operation of applying a voltage between 32.

DESCRIPTION OF SYMBOLS 100 Incompatibility detection apparatus 10 (10-1, 10-2) Oscillator, 12 Oscillation switching part 20 (20-1, 20-2) Incompatibility detection circuit 21 Detection part, 22 Insulation transformer 23 (23-1, 23-2) ) Check switching unit SW1 to SW3 switch, CT1, CT2 Current detector 24 Control unit 25 Incompatibility detection relay, 26 Check relay, 27 Level detection relay 31, 32 Signal line 51 Train detection device 52 Transmitter, 53 Transmission protector, 54 Receiver, 55 reception protector

Claims (5)

A voltage is applied between the first neutral point of the first transformer to which the first cable is connected and the second neutral point of the second transformer to which the second cable is connected, and the first and A contact detection device that detects the occurrence of contact between the second cables,
AC signal generating means for generating an AC signal;
Two tactile detection circuits connected in parallel;
Comprising
Each of the contact detection circuits is
A first signal line connected to the first neutral point;
A second signal line connected to the second neutral point;
A short-circuit switch for short-circuiting the first signal line and the second signal line;
Half-wave rectifying means for half-wave rectifying the AC signal;
Applying means for applying the half-wave rectified pulsating voltage as a detection voltage between the first and second signal lines ;
Current detecting means for detecting a current flowing through the first signal line or the second signal line between the shorting switch and the applying means ;
Detecting means for detecting the occurrence of contact based on the current detected by the current detecting means;
First self-checking means for temporarily short-circuiting the short-circuit switch and self-checking a normal circuit operation based on a detection current of the current detection means during that time;
With
Wherein the said half-wave rectifying means of the two incompatible detection circuit is input to the AC signal have opposite polarities to incompatible such redundancy acting the incompatible sensing circuit sequentially depending on the polarity of the AC signal Detection device. A voltage is applied between the first neutral point of the first transformer to which the first cable is connected and the second neutral point of the second transformer to which the second cable is connected, and the first and A contact detection device that detects the occurrence of contact between the second cables,
AC signal generating means for generating an AC signal;
Two tactile detection circuits connected in parallel;
Comprising
Each of the contact detection circuits is
A first signal line connected to the first neutral point;
A second signal line connected to the second neutral point;
A short-circuit switch for short-circuiting the first signal line and the second signal line;
Half-wave rectifying means for half-wave rectifying the AC signal;
Applying means for applying the half-wave rectified pulsating voltage as a detection voltage between the first and second signal lines ;
An open switch for opening at least one of the first signal line and the second signal line between the short-circuit switch and the applying means;
Current detection means for detecting a current flowing through the first signal line or the second signal line between the short-circuit switch and the neutral point ;
Detecting means for detecting the occurrence of contact based on the current detected by the current detecting means;
While the application means of the other intrusion detection circuit applies the detection voltage, the short-circuit switch is temporarily short-circuited and the open switch is temporarily opened, and the current detection means detects a current detected therebetween. A second self-checking means for self-checking the normal circuit operation of the self-mixing detection circuit based on
With
Wherein the said half-wave rectifying means of the two incompatible detection circuit is input to the AC signal have opposite polarities to incompatible such redundancy acting the incompatible sensing circuit sequentially depending on the polarity of the AC signal Detection device. A voltage is applied between the first neutral point of the first transformer to which the first cable is connected and the second neutral point of the second transformer to which the second cable is connected, and the first and A contact detection device that detects the occurrence of contact between the second cables,
AC signal generating means for generating an AC signal;
Two tactile detection circuits connected in parallel;
Comprising
Each of the contact detection circuits is
A first signal line connected to the first neutral point;
A second signal line connected to the second neutral point;
A short-circuit switch for short-circuiting the first signal line and the second signal line;
Half-wave rectifying means for half-wave rectifying the AC signal;
Applying means for applying the half-wave rectified pulsating voltage as a detection voltage between the first and second signal lines ;
An open switch for opening at least one of the first signal line and the second signal line between the short-circuit switch and the applying means;
A first current detector for detecting a current flowing through the first signal line or the second signal line between the shorting switch and the applying means; and the first current between the shorting switch and the neutral point. Current detection means having a second current detector for detecting a current flowing through the signal line or the second signal line ;
Detecting means for detecting the occurrence of contact based on the current detected by the current detecting means;
First self-checking means for temporarily short-circuiting the short-circuit switch and self-checking a normal circuit operation based on a detection current of the first current detector during the short-circuiting;
While the application means of the other intrusion detection circuit applies the detection voltage, the short-circuit switch is temporarily short-circuited and the open switch is temporarily opened, while the second current detector A second self-checking means for self-checking the normal circuit operation of the self-tactile detection circuit based on the detected current;
With
Wherein the said half-wave rectifying means of the two incompatible detection circuit is input to the AC signal have opposite polarities to incompatible such redundancy acting the incompatible sensing circuit sequentially depending on the polarity of the AC signal Detection device. The two contact detection circuits cause the detection means, the first self-checking means, and the second self-checking means to function sequentially and sequentially in a predetermined order, and the second self-checking About the means, when the detection means of the other mixed contact detection circuit is functioning,
The intrusion detection apparatus according to claim 3 . The AC signal generating means has two oscillation units,
One oscillating unit checking means for determining normal operation of the one oscillating unit based on an oscillation signal of one of the oscillating units,
The other oscillating unit checking means for determining the normal operation of the other oscillating unit based on the oscillation signal of the other oscillating unit;
Based on the check result of the one oscillating unit checking means and the check result of the other oscillating unit checking means, the oscillating unit that generates an alternating current input to the two intrusion detection circuits is switched to one of the two oscillating units. Switching means;
Further comprising
The intrusion detection apparatus according to any one of claims 1 to 4 .

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