JP2632744B2 - Line insulation deterioration detection method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a system for detecting deterioration of insulation between lines of a control line between a starting point device and a train approach detection main device in a railroad crossing warning system. Things.

(Background of the Invention) A railroad crossing warning system includes a warning device including a railroad crossing alarm provided at a railroad crossing, and a train approaching the railroad crossing detected at a starting point before the railroad crossing and then at a terminal point. It comprises a train approach detection device for operating an alarm device until it is detected, and a cable for electrically coupling these devices.

This cable is used to coexist a control line for the train approach detection device to transmit information and a power line for supplying a DC voltage (normally 24 V) from the train approach detection device to the starting point device. Usually, four cores are used.

When insulation deterioration occurs between any of the control line (+ side) and the power supply line (+ side) and the control line (-side), DC current leaks to the control line (-side), and the insulation deterioration progresses. Finally, this may be received as abnormal information in the train approach detection main unit.

Normal operation (closed state) in train approach detection device
The alarm control relay of the starting point device (closed circuit type railroad crossing controller) is restored once when the train enters the control section, and the reaction relay of the train approach detection main unit is restored once. The detection main unit is designed to obtain the approach information of the train, but despite the alarm control relay of the starting point device being restored by the approach of the train, leakage current occurs due to deterioration of line insulation of the control line, Due to the progress of insulation deterioration, the reaction relay of the train approach detection main unit cannot be restored at last, and as a result, there is a possibility that a dangerous situation where the railroad crossing alarm system malfunctions may be detected, and such a malignant obstacle is discovered and prevented beforehand To do so is one of the most important railroad crossing maintenance conditions for the company that manages the railway.

Conventionally, as a method of detecting or monitoring the insulation state of a line, since the insulation resistance between the cable cores is relatively high, in order to accurately detect the insulation resistance value, several tens of volts or more are required. It is necessary to apply a high voltage of several hundred volts DC. However, if the monitored line is DC, this method cannot be used as it is. We have to rely on methods such as indirect monitoring using wires.

Of the above methods, the former is not only complicated but also cannot always monitor the state of insulation deterioration of the circuit, and the latter method only monitors the adjacent circuit indirectly. The state of the line is not guaranteed, and a system that directly affects the safety of human life, such as a railroad crossing warning system, has problems such as the need for many operations for detailed maintenance.

(Object of the Invention) An object of the present invention is to solve the above-mentioned problems, to directly monitor a control line that is actually operating, and to detect line-to-line insulation deterioration of the control line at an early stage. It is an object of the present invention to provide an inter-insulation deterioration detection method.

(Features of the Invention) In order to achieve the above object, the present invention according to claim 1 is provided at a starting point, and connects one end of a make contact of an alarm control relay, which is opened when the excitation is cut off when approaching a train, with a direct current. A positive control line connected to the positive terminal of the power supply,
The other end of the make contact of the alarm control relay is connected to the minus terminal of the DC power supply, and the minus control line connected through the coil of the reaction relay. In parallel with both ends of the power relay, a voltage detecting means is connected via a break contact of the reaction relay,
When the voltage value detected by the voltage detecting means is within a predetermined range, line insulation deterioration is detected, whereby the make contact of the alarm control relay at the starting point is opened when the train approaches, and the break contact of the reaction relay is correspondingly opened. Is closed, so that the voltage applied to both ends of the coil of the reaction relay through the line insulation deterioration point of the control line is detected by the voltage detecting means.

Further, in the present invention, when the reaction relay is an open self-holding type, the make contact parallel circuit of the make contact of the reaction relay and the make contact of the alarm control relay installed at the end point is used for the reaction. In parallel with the series circuit of the coil of the relay, a current detecting means and a pseudo resistor equal to the resistance value of the coil of the reaction relay are respectively connected via break contacts of the reaction relay, and a voltage detected by the voltage detecting means is connected. When the value is within the predetermined range, the insulation deterioration between the lines is detected, and when the train approaches, the make contact of the alarm control relay at the starting point opens, and the break contact of the reaction relay closes accordingly, so that the control circuit is closed. The voltage applied to both ends of the pseudo resistor through the line insulation deterioration portion is detected by the voltage detecting means.

(Embodiment of the Invention) Fig. 1 is a configuration diagram of a train approaching detection device of a railroad crossing alarm system, in which a line insulation deterioration detector for implementing the line insulation deterioration detection method of the present invention is installed. The train approach detection device
It comprises a train approach detection main unit 1, a starting point device 2, and an end point device 3.

In the arrangement of the train approach detection device shown in FIG. 1 (a), in the traveling direction of the train at the railroad crossing 4 to be warned, about 10 m
An end point device 3 is installed at the rear, and about 60
A starting point, which is a fixed point for detecting the approach of the train, is defined in the range of 0 m to 1200 m ahead, and the starting point device 2 is installed there. The starting point device 2 is connected to the train approach detection main device 1 by a cable 5, and the cable 5 is composed of power supply lines 5a and 5b and control lines 5c and 5d.
Consists of

As shown in FIG. 1 (a), the starting point device 2 is provided with a level crossing alarm system, that is, a closed circuit type level crossing controller that is constantly operating from the time when the train approach detection device is turned on until the train arrives. The make contact ar of the alarm control relay AR (coil not shown) is always closed. As shown in FIG. 1 (b), a make contact ar of the alarm control relay AR is inserted in series in the starting point device 2 between the plus side control line 5c and the minus side control line 5d. Thus, a signal path of the train approach information is formed. The plus side control line 5c is connected to the plus side terminal of the DC power supply 6 (24V) in the train approach detection main unit 1, and the minus side control circuit 5d also controls the coil of the reaction relay APR in the train approach detection main unit 1. Is connected to the negative terminal of the DC power supply 6 via the power supply.

Note that the coil resistance of the reaction relay APR is approximately 260Ω.

A break contact apr of the reaction relay APR is provided between the negative control line 5d and the negative terminal of the DC power supply 6.
, The line insulation deterioration detector 7 is connected through the input terminal t1.

FIG. 2 is a block diagram of the line insulation deterioration detector 7.

The voltage input to the input terminal t1 is detected by the detection circuit 8
First, the signal is input to a buffer circuit 9 for matching with an external circuit. The output of the buffer circuit 9 is input to a low-pass filter 10 that blocks noise existing in the control lines 5c and 5d and passes only a DC voltage. The output of the low-pass filter 10 is 1V to 9V due to insulation deterioration.
Comparator that outputs a signal only when a DC voltage is detected
11 (corresponding to the voltage detecting means of the present invention), and when the signal from the comparator 11 arrives, the storage circuit 12 stores the signal until a reset operation is manually performed, and displays the display by the light emitting element 13. Do. The limiting circuit 14 is a circuit for preventing a malfunction of the comparator 11 due to a low voltage (1 V or less) and an overvoltage (9 to 24 V), and the voltage of the input terminal t1 of the line insulation deterioration detector 7 is 1 V or more. Or, when it is detected that the voltage exceeds 9 V, the operation of the comparator 11 is stopped.

The pseudo resistor 15 (260Ω) between the input terminal t2 of the line insulation deterioration detector 7 and the negative terminal of the DC power supply 6 is used when an open self-holding type reaction relay is used. Things.

With reference to FIGS. 1 (b) and 2 described above, the train approach detection operation and the line insulation deterioration detection operation according to the present invention will be described.

When the power of the level crossing alarm system is turned on, the power is supplied to the train approach detection main unit 1 and the alarm control is performed by the DC power supplied from the train approach detection main unit 1 to the starting point device 2 by the power supply circuits 5a and 5b. Since the relay AR operates and its make contact ar closes, the plus terminal of the DC power source 6 → the plus control line 5c → the make contact ar of the alarm control relay AR of the starting point device 2 → the minus control line 5d ~ train approach detection A circuit for detecting the approach of the train is formed, such as the coil of the reaction relay APR of the main unit 1 → the negative terminal of the DC power supply 6.

When the train passes the starting point, that is, the installation point of the starting point device 2, the alarm control relay AR is restored in the starting point device 2. Accordingly, the reaction relay APR in the train approach detection main device 1 is restored. That is, in this way, the information of the arrival at the fixed point of the train is obtained by the recovery of the reaction relay APR which is always operating when the train does not arrive in the train approach detection main unit 1, and thus the train approach detection is performed. The main device 1 starts an alarm device installed on a crossing, and generates an alarm display and an alarm sound.

When the train is passing the starting point, the alarm control relay AR of the starting point device 2 and the reaction relay APR of the train approach detection main unit 1 are restored, but at this time, the starting point device 2 and the train approach detection main unit 1 are restored. Insulation deterioration occurs between the lines of the control lines 5c and 5d connecting the control lines 5c and 5d, and the effective DC resistance between the control lines 5c and 5d viewed from the train approach detection main unit 1 side is about 6 kΩ to about 430 Ω
If it has decreased to a degree, the starting point device 2
When the alarm control relay AR of the
V is divided by the effective DC resistance between the lines of the control lines 5c and 5d and the coil resistance 260Ω of the reaction relay APR, and a DC voltage of 1V to 9V is applied to the input terminal t1 of the line insulation deterioration detector 7. Since this voltage appears, this voltage is detected by the detection circuit 8 of the line insulation deterioration detector 7 and stored in the storage circuit 12 of the detection circuit 8, and the light-emitting element
Turn on 13 to indicate insulation deterioration.

The reaction relay APR is a relay with a rated operating voltage of 24 V,
It does not operate at a low voltage of about 1 V to 9 V, and in this way, in a state where insulation deterioration does not progress fatally, that is, in a range where it can still function as a train approach detection device,
In addition, by detecting insulation deterioration without any influence on the operating control lines 5c and 5d, a malignant failure can be prevented before a fatal failure occurs.

In addition, since this state is simultaneously transmitted to the centralized monitoring device at the railroad crossing, the railroad crossing security officer can know this state, so by detecting the malignant disorder in advance and taking necessary measures, The danger that the railroad crossing warning system will malfunction can be prevented beforehand.

The control circuit 14 blocks so that the comparator 11 of the detection circuit 8 of the line insulation deterioration detector 7 does not detect when the DC voltage is 1 V or less. In order to prevent the line insulation deterioration detector 7 from malfunctioning unnecessarily due to a small voltage induced from another traffic signal or the like appearing on the negative control line 5d. The reason that the voltage is blocked by the limiting circuit 14 is that the normal state is erroneously regarded as an abnormal state at the moment when the power is supplied to the railroad crossing warning system due to the operation and recovery characteristics of the 24 V rated relay used for the reaction relay APR. This is to avoid detection.

FIG. 1 (c) shows an installation state of the line insulation deterioration detector 7 when an open self-holding type reaction relay SR is used as a reaction relay.

FIG. 1 (c) is different from FIG. 1 (b) in that the negative control line drawn into the train approach detection main unit 1 is used.
Make contact of reaction relay SR between 5d and reaction relay SR
A parallel circuit of make contact br of sr1 and alarm control relay BR (coil not shown) of end point device 3 is inserted, and a reaction relay built in line insulation deterioration detector 7
In order to use the pseudo resistor 15 corresponding to the resistance value of the SR coil between the negative control line 5d and the negative terminal of the DC power supply 6, the insulation between the lines is deteriorated via the break contact sr2 of the reaction relay SR. When the detector 7 is connected, the input terminal t1 is connected to the input terminal t2.

In the case of FIG. 1 (c), when the operation of the alarm control relay AR may become unstable due to rust on the rail while the train is passing the starting point, the operation of the railroad crossing alarm system may be disabled. Make contact ar and reaction relay AP to prevent stability
The circuit composed of R is configured as an open self-holding circuit, and the reaction relay in this case is called SR. In this case, the line insulation deterioration detector 7 is connected as shown in FIG.

In FIG. 1 (c), when the power of the railroad crossing alarm system is turned on, the alarm control relay AR of the starting point device 2 operates, but the reaction relay SR of the train approach detection main unit 1 and the end point device. The alarm control relay BR of 3 cannot operate.
Therefore, by temporarily operating the alarm control relay BR once, the positive terminal of the DC power supply 6 → the positive control line 5c → the make contact ar of the alarm control relay AR of the starting point device 2
→ Minus side control line 5d → Make contact br of alarm control relay BR of end point device 3 → Coil of reaction relay SR → Negative side terminal of DC power supply 6 is formed, whereby reaction relay SR is energized, The reaction relay SR is held by the make contact sr1, and enters a standby state as in the case of FIG. 1 (b).

When the train passes the starting point, the alarm control relay AR is restored in the starting point device 2. As a result, the reaction relay SR is restored in the train approach detection main unit 1, and FIG. 1 (b)
As in the case of (1), the approach of the train is detected based on this information, and the train approach detection main unit 1 starts an alarm device provided on a railroad crossing to generate an alarm display and an alarm sound.

At this time, in the train approach detection main unit 1, at the same time, the detection circuit 8 of the line insulation deterioration detector 7 detects the voltage of the pseudo resistor 15 connected to the minus control line 5d via the break contact sr2 of the reaction relay SR. Monitor.

In the case of FIG. 1 (c), as the alarm control relay AR and the reaction relay SR are restored by the approach of the train, the reaction relay SR
Since the parallel circuit with the make contact br of the alarm control relay BR is open as well as the make contact sr1 of, even if the insulation between the lines deteriorates, the DC power supply voltage of 24 V is applied to the control lines 5c and 5d. The voltage is not divided by the effective DC resistance between the lines and the coil resistance 260 Ω of the reaction relay SR, and the DC power supply voltage of 24 V directly appears at the input terminal t1 of the line insulation deterioration detector 7 and becomes undetectable. Therefore, by connecting the input terminal t1 and the input terminal t2, a voltage is generated in the pseudo resistor 15 having a resistance value of 260 Ω corresponding to the coil resistance of the reaction relay SR. As in the case, control lines 5c and 5
When insulation degradation occurs during d and the effective DC resistance between the control lines 5c and 5d decreases to about 6 kΩ to about 430 Ω, the alarm control relay AR of the starting point device 2 is restored by the approach of the train,
As a result, when the reaction relay SR is restored,
24V is the effective DC resistance and pseudo resistance between the control lines 5c and 5d.
The voltage is divided by 15 to the input terminal t1 of the line insulation deterioration detector 7
A DC voltage of 1V to 9V will appear. This voltage is detected by the detection circuit 8 of the line insulation deterioration detector 7 and stored in the storage circuit 12 of the detection circuit 8, and the light emitting element 13 is turned on to indicate the insulation deterioration.

In addition, while the train is passing through the control section of the end point 3, the alarm control relay BR operates in the end point device 3, but since the alarm control relay BR operates once,
The alarm display and the alarm sound are stopped.

(Effect of the Invention) As described above, according to the first aspect of the present invention, one end of the make contact of the alarm control relay, which is installed at the starting point and opened when the excitation is cut off when the train approaches, is connected to the DC power supply. Between the plus side control line connected to the plus side terminal and the minus side control line connecting the other end of the make contact of the alarm control relay to the minus side terminal of the DC power supply via the coil of the reaction relay. When detecting insulation deterioration, voltage detection means is connected in parallel to both ends of the coil of the reaction relay via break contacts of the reaction relay, and the voltage detected by the voltage detection means is within a predetermined range. When the train approaches, the make contact of the alarm control relay at the starting point opens, and the break contact of the reaction relay closes accordingly. The voltage applied to both ends of the coil of the reaction relay is detected by the voltage detection means through the inter-insulation deterioration point, so that the actually operating control line is directly monitored and the line insulation of this control line is performed. Deterioration can be detected at an early stage.

According to the second aspect of the present invention, when the reaction relay is an open self-holding type, a rake contact parallel circuit of a make contact of the reaction relay and a make contact of an alarm control relay installed at an end point. In parallel with the series circuit of the coil of the reaction relay, through the break contact of the reaction relay,
The current detection means and the pseudo-resistance equal to the resistance value of the coil of the reaction relay are connected respectively, and the voltage detected by the voltage detection means is within a predetermined range, thereby detecting deterioration of insulation between lines, When the make contact of the alarm control relay at the starting point opens when the train approaches, and the break contact of the reaction relay closes accordingly, the voltage applied to both ends of the pseudo resistor through the line insulation deterioration point of the control circuit is detected by voltage detection means. , It is possible to directly monitor a control line that is actually operating, and detect deterioration of line insulation of the control line at an early stage.

[Brief description of the drawings]

FIG. 1 is a block diagram of a train approaching detection device of a railroad crossing warning system in which a line insulation deterioration detector for implementing the line insulation deterioration detection method of the present invention is installed, and FIG. FIG. 1 ... train approach detection main unit, 2 ... starting point device, 3 ...
... End point device, 5a, 5b ... Power line, 5c ... Plus control line, 5d ... Negative control line, 6 ... DC power supply
7 ... line insulation deterioration detector, 8 ... detection circuit, 9 ... buffer circuit, 10 ... low-pass filter, 11 ... comparator, 12 ... storage circuit, 13 ... light emitting element, 14 ... ... Limiting circuit, 15 ... Pseudo resistor, AR ... Start point alarm control relay, ar ... Make contact, APR ... Reaction relay, apr ... Break contact, BR ... End point alarm control relay, br ... Make contact, SR… Reaction relay, sr1… Make contact, sr2… Break contact.

Continuation of the front page (56) References JP-A-63-215458 (JP, A) JP-A-63-82368 (JP, A) JP-A-64-67474 (JP, A)

Claims (2)

(57) [Claims] A positive control circuit connected to a positive terminal of a DC power supply, the positive control circuit being connected to a positive terminal of a DC power supply and being installed at a starting point and being opened when excitation is cut off when a train approaches. The other end of the make contact of the relay, to the negative terminal of the DC power supply, with a negative control line connected via the coil of the reaction relay, a method of detecting insulation deterioration between the lines, the coil of the reaction relay Voltage insulation means is connected in parallel to both ends via a break contact of the reaction relay, and when the voltage detected by the voltage detection means is within a predetermined range, line insulation deterioration is detected. Deterioration detection method. 2. A plus-side control line for connecting one end of a make contact of an alarm control relay, which is installed at a starting point and is opened when excitation is cut off when approaching a train, to a plus terminal of a DC power supply; The other end of the make contact of the relay is connected to the negative terminal of the DC power supply, a make contact parallel circuit of the make contact of the reaction relay and the make contact of the alarm control relay installed at the end point, and the coil of the reaction relay. A method of detecting insulation deterioration between lines with a negative control line to be connected, wherein a current is supplied in parallel to a series circuit of the make contact parallel circuit and the series coil of the reaction relay via a break contact of the reaction relay. The detecting means is connected to a pseudo-resistor equal to the resistance value of the coil of the reaction relay, and the voltage detected by the voltage detecting means is within a predetermined range. The line insulation degradation detection method which is adapted to detect the insulation deterioration.