JP2003165440A - Protector for controlling grade crossing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent intrusion of a lightning surge from an alternating current side to a direct current side, and protect the direct current side from the lightning surge more strongly. <P>SOLUTION: A direct current side protector 80 is mounted on a board 81, an alternating current side protector 90 is mounted on a board 91, and they are separated. The direct current side protector 80 is provided with a surge absorber 73, B terminals B+ and B- connected to the surge absorber 73, choke coils 74 and 75, L terminals L+ and L-connected to the B terminals via the choke coils 74 and 75, a three pole arrester tube 77 connected to the L terminals L+ and L- via varistors 76 and 78, choke coils 71 and 72, M terminals M+ and M-connected to the B terminals via the choke coils 71 and 72, choke coils 82 and 83, and ME terminals ME+ and ME- connected to the B terminals via the choke coils 82 and 83. An electronic grade crossing controller is connected to the ME terminals. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a railroad crossing control protector intended to prevent lightning damage to electronic equipment for alarm control and monitoring at railroad crossings.

[0002]

2. Description of the Related Art A crossing control safety device used in a crossing control device box (crossing device box) is described in detail in "New Edition Crossing Safety" page 321 "3.22 Security Device" edited by the Signal Safety Association of Japan. As mentioned above, since lightning surges are expected to enter from all circuits connected to the AC and DC sides of the local power supply,
Each line connection part has its own protective measures to prevent the dielectric breakdown due to the intrusion of lightning surge inside the equipment.
Conventionally, for railroad crossings, a protector (for signals) has been unitized as a protector for the local power supply for the AC side and the DC side.
The F type is used.

FIG. 4 (a) shows an example of a circuit configuration for such a railroad crossing facility against lightning damage. Further, FIG. 3B is an external perspective view of the protector (for signal) F type. A signal flame tube 20 with a signal protector 21 incorporating a surge damper is installed on a railroad crossing 11 of the rail 10 (track), and a railroad crossing controller 30 is installed at a starting point across the railroad crossing 11. The crossing controller 40 is installed at the end point. Crossing controller 3
Input / output ports 0 and 40 are connected to the rail 10.

All of them are connected to a railroad crossing control protector 60 in a railroad crossing device box 50 by a signal cable.
Specifically, the signal flame tube 20 includes a protector 21 and an operating device 22.
And a cable 23, and is connected to the L terminals L + and L- (first output terminal) of the level crossing control protector 60. The railroad crossing controller 30 has a DC power supply line connected to a signal protector 31 with a built-in lightning arrester connected to an L terminal L +, via a cable 32.
It is connected to L-. In the crossing controller 40, a DC power supply line to which a signal protector 41 with a built-in lightning arrester is connected is also connected to L terminals L + and L- via a cable 42.

In addition to the railroad crossing control protector 60, the railroad crossing equipment box 50 includes a transformer 51 and a rectifier 52 for converting an alternating current supplied from an external 100 V AC power source into a direct current of an appropriate voltage, and a smoothing of the direct current. A storage battery 53 for converting
A relay circuit, etc. 55 for controlling an intermittent relay, an alarm sound generator, etc. are stored. The AC input line of the transformer 51 is connected to the AC terminals AC + and AC- of the protector 60 for level crossing control.
The DC output line of the rectifier 52 is connected to the (second input terminal), and the DC output line of the rectifier 52 is connected to the B terminals B + and B- (first terminal of the crossing control protector 60).
The DC power supply line of the relay circuit 55 is connected to the input terminal), and the DC power supply line of the relay circuit 55 is connected to the M terminals M +, M- of the protector 60 for level crossing control (second
Output terminal). Of the E terminals of the level crossing control protector 60, the connection terminal E1 on the AC side is the level crossing device box 5
0 is grounded and is grounded, and the DC-side connection terminal E2 exits the railroad crossing device box 50 and is connected to the rail 10. For the AC terminal, AC100V drawn from the outside to the level crossing control protector 60
The AC distribution line of the power supply is also connected.

The level crossing control protector 60 includes a single board 61.
An AC side protector and a DC side protector are mounted on the upper side (see FIG. 4B), which is a standard product, but the internal circuit configuration will also be described in detail based on the above literature. (Fig. 4
(See (a)). On the AC side of the railroad crossing device box 50, a varistor 62, a triode arrester 63 (second arrester), and a varistor 64 are provided.
, A connection terminal AC +, a connection terminal AC−, and a connection terminal E1. The ground electrode of the triode arrester 63 is the connection terminal E1.
One of the remaining poles is connected to the connection terminal AC + via the varistor 62, and the other pole is connected to the varistor 64.
Is connected to the connection terminal AC− via.

On the DC side of the railroad crossing control protector 60, choke coils 71 and 72 (second inductance section), surge absorber 73 (surge buffer), and choke coil 7 are provided.
4, 75 (first inductance part), a varistor 76, a triode arrester 77 (first arrester), and a varistor 78 are included. The M terminal, B terminal, and L terminal are also included on the DC side.
The choke coil 71 has one end connected to the connection terminal M + and the other end connected to the connection terminal B +. Similarly, the choke coil 72 is connected to the connection terminals M- and B-, the choke coil 74 is connected to the connection terminals L + and B +, and the choke coil 75 is connected to the connection terminals L- and B-. The surge absorber 73 has one pole connected to the connection terminal B + and the other pole connected to the connection terminal B-. In the three-pole surge arrester 77, the ground electrode is connected to the connection terminal E2, one of the remaining poles is connected to the connection terminal L + via the varistor 76, and the other pole is connected to the connection terminal L- via the varistor 78. It is connected.

In the level crossing equipment having such a structure, when a lightning surge is induced in the AC distribution line (AC100V), almost the same voltage is induced in the two lines at the same time. Both electrodes of the tube 63 are discharged, and the lightning surge flows to the ground through the connection terminal E1. Varistor 62,
64 prevents the triode arrester 63 from continuing. Since the power supply voltage is applied to the triode arrester 63 inserted in the power supply circuit even after the discharge due to the lightning surge, there is a continuous current phenomenon in which the current flows from the power supply side and the discharge continues. In the AC power supply, the current continues for half a wave until the voltage becomes close to zero. Continuation accelerates the deterioration of the triode arrester 63, and in order to prevent this, the varistor 62, 64 that has a high resistance to the power supply voltage and a low resistance to the high voltage lightning surge is used. To be

DC power is supplied from the L terminal to external devices such as the signal flame tube 20 and the level crossing control elements 30 and 40. Varistors 76 and 78 are also used for the triode arrester 77. DC power is supplied from the M terminal to electronic devices such as the relay circuit 55. Choke coils 74 and 75 between terminals B and L and choke coil 7 between terminals B and M
1, 72, the influence of lightning surge entering each terminal circuit,
It is inserted so that it is difficult to reach the other terminals. Also,
The choke coils 71 and 72 on the M terminal side also have an action of suppressing an excessive rush current that instantaneously flows in the signal light bulb during the operation of the intermittent relay. The surge absorber 73 at the B terminal protects the electronic device from a lightning surge that enters through another external device (not shown) connected to the B terminal.

When the AC side protector operates due to the lightning surge entering the distribution line and the lightning surge flows to the ground as described above, the ground potential rise of the connection terminal E1 is applied to the primary side of the transformer 51. On the other hand, the secondary side is maintained at the potential of the rail 10 to which the connection terminal E2 is connected. Therefore, the circuit is protected against the rise of the ground potential within the range of the withstand voltage between the primary and secondary coils of the transformer 51.

On the DC side, the grounding connection terminal E2 of the protector is connected to the rail 10 so that the lightning surge is released to the rail 10 which is considered to have a low surge impedance.
For example, a part of the lightning surge induced in the cable 32 flows to the rail 10 through the protector 31 of the railroad crossing controller 30 and a connection line between the railroad crossing controller 30 and the rail 10, and the other part thereof crosses the railroad crossing controller. It flows to the rail 10 through the connection line between the rail 40 and the protector 41 of 40 and the railroad crossing controller 40. The rest also flows to the rail 10 through the L terminal, the triode arrester 77, the connection terminal E2, and the like. In this way, a lightning surge is prevented from entering the level crossing controllers 30 and 40. As for the lightning surge protection of the signal flame tube 20, in addition to the protector 21, L of the protector 60 for level crossing control is also used.
A path through the terminal, the triode arrester 77 and the connection terminal E2 is useful.

[0012]

In such a conventional level crossing control protector, the portion constituting the alarm control logic circuit of the level crossing is made into a logic circuit using a signal relay to notify the train of obstacles in the level crossing. As a means for doing so, it is premised that a smoke tube or the like called a signal flame tube is used. On the other hand, in recent years, the alarm control logic circuit using a relay is
The electronic crossing control device 54 controlled by a microcomputer is replaced, and the signal flame tube is an LED.
It is being replaced by a special signal light emitting device using.
Further, the centralized monitoring device has also been a device mainly composed of a relay circuit in the past, but is replaced by a device having a serial transmission function by a microcomputer.

However, microcomputers are relatively vulnerable to lightning surges. Even if such a microcomputer is introduced into a control / monitoring device, the conventional protector (for signal) type F is still used as the protector for the local power supply. The power terminals of the newly introduced devices (54, etc.) are also connected to electronic devices (55) such as the conventional intermittent relays and alarm sound generators.
Etc.) is connected to the M terminal. The intermittent relay controls the blinking of the level crossing warning light mounted on the warning pole alternately, and the warning sound generator is a device that sends a warning sound signal to the speaker also mounted on the warning pole.
A dedicated metal cable is connected between the intermittent relay and the railroad crossing warning light, and between the railroad crossing alarm sound generator and the speaker.

Therefore, when a lightning strike is made to a nearby overhead ground wire, a lightning surge is easily induced in the cable, resulting in M
Lightning surges will enter the terminals. At the M terminal, protection can be performed up to a level that the intermittent relay or the alarm sound generator can withstand, but it may not be possible to protect up to the withstand level of the electronic railroad crossing control device 54. Therefore, there is a high possibility that the electronic crossing control device 54 will be destroyed or the system will be down due to the lightning surge, and as a result, there is a high possibility that an alarm persistent failure of the level crossing alarm will be caused.

Further, the protector (for signal) F type substrate 61 has a protector circuit for the purpose of protecting the DC circuit, in addition to the protector circuit.
A protector circuit is also installed to protect the AC circuit of the primary power supply. Therefore, in the wire wiring inside the equipment box for level crossings, the DC circuit and the AC circuit are adjacent to each other at the part of the protector, and the lightning surge that has entered the AC circuit on the primary side is electrostatically connected to the wiring of the DC circuit. It is easy to connect to the DC side, and as a result, it will penetrate into the DC side. Therefore, in order to prevent lightning surges from entering from the AC side to the DC side and to effectively protect the electronic level crossing control device and the like from lightning surges that have entered the M terminal from the relay circuit, etc. Is to improve.

The present invention has been made to solve the above problems, and an object thereof is to realize a level crossing control protector in which a lightning surge does not enter or hardly enters from an AC side to a DC side. . Another object of the present invention is to realize a crossing control protector in which the DC side is more strongly protected from lightning surges.

[0017]

The first and second solving means invented to solve the above problems are as follows:
The configuration and action and effect will be described below.

[First Solving Means] The crossing control protector of the first solving means is a crossing provided with a DC side protector and an AC side protector as described in claim 1 at the beginning of the application. In the control protector, the DC-side protector is mounted on the first substrate, and the AC-side protector is provided as a second body which is separate from the first substrate.
It is mounted on the board.

More specifically, the surge buffer, the first input terminal (B terminal) connected to the surge buffer, the first inductance section (74, 75), and the first input terminal via the first inductance section (74, 75) The first output terminal (L terminal) connected, the first lightning arrester (77) connected thereto, the second inductance section (71, 72), and the first input terminal connected therethrough The second output terminal (M terminal) and the second lightning arrester (6
3) and a protector for railroad crossing control comprising a second input terminal (AC terminal) connected to the first input terminal, the first inductance section, the first output terminal, and the first lightning arrester. And the second inductance portion and the second output terminal are mounted on a first substrate (81), and the second lightning arrester and the second input terminal are a second substrate (91) separate from the first substrate. ) Is installed in.

In the level crossing control protector of the first solution, the DC side protector and the AC side protector are physically separated from each other. The electrostatic coupling with the wiring of is weakened. As a result, even if a lightning surge enters the AC circuit, it is prevented or difficult to enter the DC circuit even further. Therefore, according to the present invention, it is possible to realize a railroad crossing control protector in which a lightning surge does not enter the AC side to the DC side or in which the lightning surge does not enter the DC side.

[Second Solving Means] A crossing control protector of the second solving means is, as described in claim 2 at the beginning of the application, a surge buffer, a first input terminal connected to the surge buffer, First
An inductance part, a first output terminal connected to the first input terminal via the inductance part, a first lightning arrester connected to the first output terminal, a second inductance part, and the first output terminal via the second inductance part.
In a level crossing control protector (80) having a second output terminal (M terminal) connected to an input terminal, a third inductance section (82, 83) and a connection to the first input terminal via the third inductance section (82, 83) The third output terminal (ME terminal) is added.

In the level crossing control protector of the second means, the relay circuit for controlling and driving the level crossing warning light, level crossing alarm sound generator, etc., of the electronic equipment to which the DC power is supplied is It is connected to the second output terminal (M terminal) as before, but electronic crossing control devices including microcomputers and central monitoring equipment among the electronic devices to which DC power is supplied are connected to the new third output terminal (ME terminal). To be done. A second inductance section, a surge buffer, and a third inductance section are interposed between the second output terminal and the third output terminal.

Thus, even if a lightning surge is induced in the cable of the level crossing warning light or the level crossing alarm sound generator, the lightning surge reaches the electronic level crossing control device or the like via the second output terminal or the third output terminal. In addition, it is blocked or suppressed by the intervening inductance section, surge buffer, or the like. Therefore, according to the present invention, it is possible to realize a crossing control protector in which the DC side is more strongly protected from a lightning surge.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION With regard to the level crossing control protector of the present invention achieved by such a solution, a concrete mode for carrying out the same will be described with reference to the embodiments shown in FIGS. To do. First, the specific configuration will be described with reference to the drawings. FIG. 1A is a perspective view of the entire appearance, which is to be compared with FIG. 4B of a conventional example. Figure 1 (b)
Is a circuit diagram of the DC side protector, and FIG. 7C is a circuit diagram of the AC side protector. FIG. 2A is a plan view of the DC-side protector, and FIG. 2B is a side view thereof.

In the drawings, the same reference numerals are given to the same constituent elements as in the prior art, and therefore the duplicated description will be omitted, and the difference from the conventional art will be mainly described below. The level crossing control protector 80 + 90 is different from the conventional leveling control protector 60 in that the DC side protector 80 and the AC side protector 90 are separated from each other and the DC side protector. This is the point where choke coils 82 and 83 (third inductance portion) and ME terminals ME + and ME− (third output terminal) are added to the container 80.

The ME terminal employs the same or similar connection terminal as the M terminal, of which the connection terminal ME + is connected to the connection terminal B + via the choke coil 82. The connection terminal ME- is connected to the connection terminal B via the choke coil 83.
-Is connected. The same or similar inductance element as the choke coil 71 or the like is used for the choke coils 82 and 83.

A first substrate 81 and a second substrate 91, which are separate bodies, are used in place of the substrate 61, and a triode arrester 63, a connecting terminal AC +, a connecting terminal AC-, and a connecting terminal E1 are provided on one substrate 91.
Are mounted to form the AC side protector 90, and the other side substrate 81 and the remaining circuit elements form the DC side protector 80. That is, the choke coils 71, 7 are provided on the substrate 81.
2, 74, 75, 82 and 83, a surge absorber 73, a triode arrester 77, varistors 76 and 78, B terminals, L terminals, M terminals and ME terminals are mounted.

The use mode and operation of the level crossing control protector of the first embodiment will be described with reference to the drawings. FIG. 3 is a circuit diagram of a railroad crossing facility incorporating the crossing control safety device, which is to be compared with FIG. 4A of the conventional example. Here again, the differences between the two will be mainly described.

The existing connection terminals B +, B-, E2, L +, L-, M +, M- of the DC-side protector 80 incorporated in the crossing device box 50 instead of the crossing control protector 60 are ,
Each of them is connected to the rectifier 52, the rail 10, the railroad crossing controllers 30, 40, the relay circuit 55, etc., as in the conventional case. In addition, a power supply converter 56 and the like are appropriately inserted in the connection line as needed. Further, the level crossing controller 30, 40
A relay circuit for inputting the relay output of the above, an intermittent railroad crossing warning light, an intermittent relay connected to a speaker with a cable, and an alarm sound generator are connected to the M terminal as before.

On the other hand, new connection terminals ME +, ME
An electronic crossing control device 54 is connected to − via a noise filter or the like. Other microcomputer built-in circuits such as a centralized monitoring circuit are also connected to the ME terminal. Further, as the transformer 51, a device in which an AC side protector 90 or a lightning arrester equivalent thereto is incorporated is adopted. Further, the signal flame tube 20 is removed due to the adoption of a special signal light emitter (not shown).
The special signal light emitter is connected to the B terminal for supplying DC power.

When the lightning surge is induced in the cables 32 and 42, the lightning surge is released as described above. On the other hand, when a lightning surge is induced in the AC distribution line, the lightning surge is escaped through the AC side protector 90 as in the conventional case, but the wiring of the transformer 51 and the AC side protector 90 is not provided. Since the DC protection device 80 and the wiring of the DC protection device 80 are spatially separated from each other, the amount and degree of the lightning surge entering the DC protection device 80 and the electronic railroad crossing control device 54 are extremely small.

Further, when a lightning surge is induced in a cable that goes out from the relay circuit or the like 55, a part of the lightning surge may reach the M terminal through the relay circuit or the like 55 as in the conventional case. However, it is different from the conventional one in that it does not reach the electronic railroad crossing control device 54 immediately from there. That is, the lightning surge entering the M terminal is attenuated and suppressed by the choke coils 71 and 72, the surge absorber 73, the choke coils 82 and 83, and the noise filter, and hardly reaches the electronic railroad crossing control device 54.

In this way, in this crossing control protector, the electronic crossing control device 5 incorporating a microcomputer, which is vulnerable to lightning surges.
4 and centralized monitoring equipment are also properly protected, and extremely high lightning surge characteristics and resistance can be obtained. As a result, system down failures of the level crossing control system are reduced.

[0034]

As is apparent from the above description, in the level crossing control protector according to the first solution of the present invention, the AC side and the DC side are physically separated from each other. There is an advantageous effect that it is possible to realize a protector for level crossing control in which a lightning surge does not enter the DC side or a small amount does not enter the DC side.

Further, in the crossing control protector according to the second solution of the present invention, the number of connection terminals for supplying a DC power source to the electronic equipment is increased so that the electronic equipment can be used properly and the inductance portion and the like are interposed. By doing so,
The advantageous effect that the protector for level crossing control, in which the DC side is more strongly protected from the lightning surge, can be realized.

[Brief description of drawings]

FIG. 1A is a perspective view of the whole cross-section control protector of the present invention, FIG. 1B is a circuit diagram of a DC-side protector, and FIG. 1C is an AC-side protector. It is a circuit diagram of.

FIG. 2A is a plan view and FIG. 2B is a side view of a DC side protector.

FIG. 3 is a circuit diagram of a railroad crossing facility incorporating the same.

FIG. 4 shows a conventional crossing control protector and crossing equipment, (a) is a circuit diagram thereof, and (b) is an external perspective view of a crossing control protector (for signal) F type.

[Explanation of symbols]

10 ... Rail (railway track), 11 ... Railroad crossing 20 ... Signal flame tube, 21 ... Protector,
22 ... Manipulator 30 ... Crossing controller (starting point side), 31 ... Protective device,
32 ... Cable 40 ... Railroad crossing controller (end point side), 41 ... Protector,
42 ... Cable 50 ... Crossing device box, 51 ... Transformer,
52 ... Rectifier 53 ... Storage battery, 54 ... Electronic crossing control device, 55 ... Relay circuit etc. 56 ... Power converter 60 ... Crossing control protector, 61 ... Board,
62 ... Varistor 63 ... Triode arrester (second arrester), 64
... Varistor 71 ... Choke coil (second inductance part) 72 ... Choke coil (second inductance part) 73 ... Surge absorber (surge suppressor, surge buffer) 74 ... Choke coil (first inductance part) 75 ... Choke coil (first) 1 Inductance part) 76 ... Varistor, 77 ... Triode arrester (first arrester) 78 ... Varistor AC +, AC -... AC terminal (AC power supply connection terminal, second)
Input terminal) E1 ... E terminal (grounding terminal) B +, B -... B terminal (rectifier connection terminal, first input terminal) L +, L -... L terminal (railroad crossing controller connection terminal, first output terminal) E2 ... E terminal (grounding terminal, track connecting terminal) M +, M -... M terminal (first electronic device connecting terminal, second output terminal) ME +, ME -... ME terminal (second electronic device connecting terminal) ,
Third output terminal) 80 DC side protector (first surge protector, crossing control protector) 81 ... First substrate 82 ... Choke coil (third inductance part) 83 ... Choke coil (third inductance part) 90 AC side protector (second surge protector, crossing control protector) 91 ... Second substrate

Claims (2)

[Claims] 1. A crossing control protector comprising a DC side protector and an AC side protector, wherein the DC side protector is mounted on a first substrate, and the AC side protector is provided. A protector for level crossing control, which is mounted on a second substrate that is separate from the first substrate. 2. A surge buffer, an input terminal connected to the surge buffer, a first inductance section, a first output terminal connected to the input terminal via the first inductance section, and a lightning arrester connected to the first output section. A crossing control protector comprising a second inductance part and a second output terminal connected to the input terminal via the third inductance part, and a third inductance part connected to the input terminal via the third inductance part. A protector for level crossing control, which is provided with three output terminals.