JPS62286870A - Method of detecting position of short circuit of track rail - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] 3. Detailed description of the invention (Industrial application field) TECHNICAL FIELD The present invention relates to a method for detecting short-circuit points in railway track rails.

(Prior Art) As is well known, when a vehicle is run using two rails, such as on a railway, each rail is electrically insulated, and the vehicle runs between the two rails. Measures such as doing this are being adopted.

Therefore, the sleepers that support the rails are made of electrically insulating materials such as wood or concrete, but recently steel sleepers are being used due to the depletion of wood resources and economic and environmental concerns regarding the disposal of old concrete sleepers. It became so.

By the way, in order to overcome the above-mentioned electrical control problems with iron sleepers, in addition to constructing the sleepers themselves with electrical insulators interposed between them, measures have also been adopted to interpose electrical insulators between the rails and the sleepers.

However, since the number of iron sleepers installed is very large, if the electrical insulation becomes defective,
A problem has arisen in that it is not easy to detect the defective location.

Regarding the detection of defective locations, exactly the same problem occurs in the case of wooden and concrete sleepers as well, due to the detection of short circuit lines due to human interference.

In the present invention, unplanned conduction between both rails due to aging of the electrical insulator or contact between conductive materials is referred to as a short circuit, and the location where the conduction occurs is referred to as a short circuit location.

If the above-mentioned short circuit occurs, a maintenance worker should perform a visual inspection along the rail, or apply voltage across the defective point to detect the insulation resistance, or repair the rail over a wide area. A method is adopted in which the electrical connection is made, the current is applied, and the presence or absence of a short circuit is detected using an ammeter.

(Problem to be solved by the invention) Now, the method of visual inspection by maintenance workers is difficult to detect because defects in electrical insulators are relatively often accompanied by morphological changes such as cracks and damage. Although it is reliable, there are problems in that it takes a long time to detect, and it is difficult to detect when there is no or small morphological change. or,
The method of measuring insulation resistance by selecting a point that is considered to be defective requires a long time and is not economical.Although the method of removing the electrical insulator and energizing it is reliable, it is difficult to work with and is inefficient. There is a problem with high costs.

(Means for solving the problem) Therefore, the present inventors installed a parallel resonant circuit whose resonant frequency is the frequency of the alternating current, and set nine inductive current detection terminals on the railway track under alternating current, and set the separation distance. The short-circuit point is detected by determining the point where the electromagnetic field suddenly changes on the line by moving the line closer to the line and inputting the obtained electromagnetic field signal to the electromagnetic field change detection device by moving continuously while maintaining the distance. We have developed a method for detecting short-circuit points on railway tracks, and have succeeded in providing an economical, reliable and quick detection method that does not have the above-mentioned problems.

(Function) The method, function, and effect of the present invention will be explained in detail below with reference to the drawings.

Figure 5 is a schematic circuit diagram illustrating signal control on railway tracks, where rails 1 & 11h are electrically insulated from each other.
Furthermore, it is electrically insulated from other rails by electrical insulators 2a to 2d. In the present invention, what is constituted by two rails of 1 ml and 1 lb is referred to as a track, and each rail is referred to as a track rail or simply a rail.

Next, the secondary circuit of the transformer 3 includes a current limiting resistor 4 and is connected to the rail 1aflb. Further, 5 indicates a primary power source.

Reference numeral 6 denotes a line relay, which is configured to close when a normal secondary voltage is applied, but to open when a short circuit 7 is formed by the vehicle, thereby transmitting to the control circuit 8 that the vehicle has arrived at the track.

Therefore, if a short circuit similar to the short circuit 7 occurs due to damage to the electrical insulation as described above, the track relay 6 will issue a false signal indicating that the vehicle has arrived even though it has not. .

Therefore, as a result of considering the above-mentioned phenomenon, the present inventors found that the sixth
As shown in the figure, an artificial short circuit 7& is created by artificially damaging the electrical insulator, and a normal secondary voltage is applied from the transformer 3 to the track rails 1a+1b to reduce the electromagnetic field generated on the rails 1a, lb. As a result of the investigation, it was found that the artificial short circuit 7a from the power loading point
Generation of electromagnetic fields is confirmed on rails lal and 1b+ up to, but rail 1a beyond the point beyond artificial short circuit 7a
It was found that no electromagnetic field was observed in 2 r 1 b2.

In addition, as a result of investigating various changes in the electrical resistance of this artificial short circuit 7a, it was found that a clear difference occurs in the electromagnetic field with the artificial short circuit 71 as a boundary.

Therefore, the present inventors manufactured an induced current detection terminal 9 and an electromagnetic field change detection device 10t equipped with an electric circuit as shown in FIG. Detection was successful with a probability of close to 100%.

The limb induced current detection end 9 and the electromagnetic field change detection device 10 will be described below.

The induced current detection terminal 9 (hereinafter simply referred to as the detection terminal) is constituted by a parallel resonant circuit with good detection accuracy and a high detection signal level especially in the commercial frequency domain.

Further, the electromagnetic field change detection device 10 includes a unit circuit 1 described below.
1 to 15, and detection is performed by the following steps:
That is, the signal detected at the detection terminal 9 is amplified by an amplifier circuit 11, passed through a rectifier circuit 12, and then compared with a set signal level in a voltage comparison circuit 13.Based on the comparison, the low frequency oscillation circuit 14 is controlled. The notification circuit 15 (shown including the power supply device) provides notification by sound or meter. Now, the actual operation of the method of the present invention using the detection end 9 and the electromagnetic field change detection device 1o as described above will be explained according to the schematic explanatory diagram of the detection procedure shown in FIG. 1. The detector 17 held by the operator 16 is the detection end 9
The main components are a sliding box 18 with a built-in electromagnetic field change detection device 10 and a detection box 19 with a built-in electromagnetic field change detection device 10. The end is configured as a photographing section 21, and the entire device is manufactured so that the operator 16 can handle it with one hand.

In FIG. 1, the iron sleepers 22a, 22b are electrically insulated by electrical insulators 23m, 23b interposed in the center, respectively, and the iron sleepers 22m, 22b are further provided with tie plates 24a, 24b, 24e, It supports rails 1a+1b via 24d.

Therefore, when the electrical insulator 23b is damaged as described above, the iron sleeper 22b becomes a short circuit, and the accumulated current flows from the rail 11LI to the iron sleeper 22b and the rail 1bt, and the rail 1a2° with the iron sleeper 22b as a boundary. It will not flow to lbl.

Therefore, when the operator 16 slides the slide 18 in the direction of the arrow 25,
If it is continuously moved along the rail 1a, it becomes possible to detect a sudden change in the electromagnetic field signal at a position beyond the iron sleeper 22b.

FIG. 2 is a schematic front view of the detector 17, and the detection box 19
The front panel has a power switch 26 and an amplifier circuit adjustment dial 2.
7, a speaker 28, a detection meter 29, and an indicator light 30 are provided, and the configuration is such that it is easy to adjust the level of the detection signal and understand the signal notification.

The detector 17 in FIG. 2 is a metal rod 2 having an appropriately set length.
This is an example in which the detection end 9 and the electromagnetic field change detection device 10 are attached to the operator 16, but it is said that fatigue will be reduced if the length of the metal rod 20 is made expandable and retractable according to the height of the operator 16 during actual work. It has been found that there are advantages and that it is easier for the operator 16 to monitor the sensor by keeping the surface of the Tux 19 horizontal.

Therefore, the method of the present invention will be explained using an example that is further improved based on the above-mentioned knowledge.

(Example) Example-1 FIG. 3 is a schematic side view of a detector 17a according to a different example used in the method of the present invention, in which the metal rod 20 is connected to the sheath pipe 2.
0a and a feeding tube 20 that is removably stored in the sheath tube 20 &
b, and the position of the delivery tube 20b is fixed by tightening the tightening gel (31m), 31b. In this way, the detection end can be moved more smoothly. Further, a sliding box 18 is rotatably attached to the tip of the feeding tube 20b via a bottle 32,
The detection end built into the sliding box 18 and the electromagnetic field change detection device inside the sensing box 19 are connected by a lead wire 33.

34m and 34b are removable connection terminals provided at both ends of the lead wire 33. With this configuration, replacement can be facilitated when the detection end is damaged.

A friction-resistant sliding plate 35 is provided at the bottom of the sliding box 18, and if the sliding plate 3S is always brought into contact with the top of the rail during movement, the set separation on the detection end will be reduced. This allows the device to move while maintaining the distance, making it possible to stably and reliably detect the electromagnetic field.

The sliding plate 35 is made of friction-resistant materials such as stainless steel, glass sticks, aluminum, and rubber, and the detection end inside the sliding box 18 is fixed with resin filling to improve electrical insulation and earthquake resistance. By using measures, the lifespan can be extended.

Furthermore, there are long holes 36m and 36b for attaching the detection box 19 to the metal rod 20 and position fixing bolts 37m and 3.
When supported by a support angle variable support fitting 38 having a variable support angle 7b, the detection terminal 19 is placed in a posture that makes it easy for the operator 16 to always monitor.
can be seen.

Embodiment 2 FIG. 4 is a schematic perspective view of a detector 17b equipped with a detection sensor 19m having a different surface plate and used for carrying out the method of the present invention, with the same reference numerals as in FIGS. 2 and 3. Since they are the same members, their explanation will be omitted.

Reference numeral 39 indicates a plug-in socket for the connection terminal 34m, and 4° indicates a plug-in socket for charging.

In this example, the power switch 26 is configured to be used to check the battery power supply, and the detection meter 29 can be used to detect charging/discharging status by switching the circuit as shown in FIG. 5, for example. It is.

(Effects of the Invention) The method of the present invention is extremely useful in practice in that it enables non-skilled personnel to quickly and reliably detect short-circuited sections of rails using a compact, low-cost device. .

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of the detection procedure according to the method of the present invention, FIG. 2 is a schematic front view of the detector used in the method of the present invention,
3 is a schematic side view of a different detector according to the method K of the present invention, FIG. 4 is a schematic perspective view of a further different detector, FIG. 5 is a schematic circuit diagram of the signal control of the rail, and FIG. 7 is a circuit diagram for explaining changes in electromagnetic field due to an artificial short circuit, and FIG. 7 is a circuit explanatory diagram of a detection end and an electromagnetic field change detecting device for carrying out the method of the present invention. 1a, lb...Rail 11J, 1 bt+ I Jll bz -Rail 2a
~2d... Electrical insulator 3... Transformer 4... Current limiting resistor 5...
- Secondary power supply 6... Line relay 7... Short circuit 7a... Artificial short circuit 8... Control circuit 9... Induced current detection end 10... Electromagnetic field change detection device 11... Amplification Circuit 12...luxury circuit 13.
...Voltage comparison circuit 14...Low frequency oscillation circuit 15.
...Notification circuit 16...Operator 17...Detector 17m, 17b...Detector 18...Sliding box 19...Detection box 1
9 &... Detection is x 20... Metal rod 20a...
-Sheath pipe 20b...Feeding pipe 21...Grip portions 22a, 22b...Iron sleepers 23a, 23b
...Electrical insulators 24m, 24b, 24c, 24d--Tie plate 2
501. Arrow 26...Power switch 27
...Amplification circuit adjustment dial 28...Speaker 29...Detection meter 30
...Indicator lights 31a, 31b...Tightening gel 32...Pin 33...Lead wire 34
m, 34b... Connection terminal 35... Sliding plate 36 a, , 36 b
...Elongated hole 37 m, 3.7 b...Position fixed gel 38...Support/support angle variable support fitting 39...Plug-in socket 40...Plug-in socket. Figure 3, Figure 4 40, Soft plug Figure 5 Figure 6

Claims (1)

[Claims] An electromagnetic sensor obtained by bringing an induced current detection end equipped with a parallel resonant circuit with a parallel resonant circuit whose resonance frequency is the frequency of the alternating current to a railway track carrying AC current at a set distance, and moving continuously while maintaining the distance. 1. A method for detecting a short-circuit point on a railway track, characterized in that the short-circuit point is detected by inputting a field signal into an electromagnetic field change detection device to find a point where the electromagnetic field suddenly changes on the line.