JPH08188069A - Electric overhead line deviation sensor - Google Patents

Abstract

PURPOSE: To accurately measure deviation from an electric overhead line using conducting ceramics. CONSTITUTION: This deviation sensor comprises two conducting ceramic wires 1a, 1b arranged in contact with and perpendicular to an electric overhead line 5. A constant voltage source 2 is connected to both ends of one conducting ceramic 1b, and a voltmeter 3 is connected between the same-side ends of both conducting ceramics 1a, 1b to measure electric potential at the crossing point A of the conducting ceramics and the electric overhead line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a train track deviation sensor used for positioning a device for measuring wear of train tracks.

[0002]

2. Description of the Related Art An electric power line is supplied with electric power through a pantograph which comes into contact therewith, but since the pantograph always comes in contact while moving at a high speed, it is necessary to measure the wear caused by the contact. For this wear measurement, for example, an ultrasonic probe or the like is used, but in that case, it is necessary to align the probe with a predetermined position with respect to the trolley line while moving the probe along the trolley line.

As a position sensor for positioning with respect to such an electric train line, for example, one disclosed in Japanese Patent Laid-Open No. 4-283135 is known, and FIGS. 3 (a) and 3 (b) are known.
Shows its structure and characteristics. In the position sensor according to this publication, the conductive ceramics 1a and 1b are provided as a sensor portion for detecting the position by contacting with the electric line 5 in order to prevent welding to the electric line 5 and to have excellent wear resistance. It is used and is arranged so as to contact the electric power line 5 at a right angle. 2 is a constant voltage power source, 3 is an ammeter, 4 is a control circuit, and 6 is a probe.

Conductive ceramics 1a, 1b and train line 5
A current is applied to the circuit composed of
The ammeter 3 detects a state in which the current flowing in this circuit changes as the positions of the conductive ceramics 1a and 1b with respect to the electric line 5 fluctuate left and right, and recognizes the position of the electric line as a change in relative position. You can

[0005]

By the way, in the above-mentioned conventional position sensor, the change in the relative position can be known from the characteristic curve of the current value with respect to the train line position of the position sensor shown in FIG. 3 (b). it can. In this case, the conductive ceramics 1a and 1b used have a diameter of, for example, 2.5c.
m, length 60 cm, electric resistivity 0.05 Ω · cm, connected to a constant voltage power source of 5V. As shown in the figure, the change in the current value by the positioning sensor changes in a curve in inverse proportion to the distance L of the conductive ceramics 1a and 1b from the electric line 5.

As can be seen from the above, in the conventional position sensor, the load resistance applied to the constant voltage power source changes due to the deviation of the electric train line, so that there is no linearity between the detected electric current and the electric train line position, and the electric conductivity between the electric line and Since the resistance of the conductive ceramics is as small as about 1Ω or less, there is a problem that the change in the contact resistance between the electric line and the conductive ceramics has a great influence on the change in the current, resulting in a large position measurement error.

Further, there is another problem that the power consumption of the constant voltage power source in the movable range of the train line is relatively large, several hundred watts at maximum.

[0008] In the present invention, in consideration of the above-mentioned problems of the position sensor for detecting the position of the electric line for the conventional measurement of the electric line wear, the electric line is made of conductive ceramics having excellent abrasion resistance. It is an object of the present invention to provide a train track displacement sensor that can accurately measure a displacement amount of a line as a linear change and has a small position measurement error.

[0009]

As a means for solving the above-mentioned problems, the present invention arranges two conductive ceramics so as to contact each other in a direction orthogonal to a train line, and fixes them to one end of each of the conductive ceramics. A voltage source is connected, and a voltmeter is connected between one end of this conductive ceramics and the other end of the other conductive ceramics.The voltmeter measures the potential at the intersection of the conductive ceramics and the power line. The train line displacement sensor is configured to detect the displacement position of the train line.

[0010]

According to the displacement sensor of the present invention having the above structure, the power source from the constant voltage power source is applied to one side portion of the one conductive ceramic and the other conductive ceramic. The voltmeter provided between the other conductive ceramic and one side of the voltmeter has one conductivity because the resistance of the electric line can be ignored and the resistance of the conductive ceramic is smaller than the internal resistance of the voltmeter. It is possible to measure the electric potential at the intersection of the conductive ceramics and the power line. This potential is accurately measured because the displacement sensor changes linearly in proportion to the displacement amount to the left and right.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a train line deviation sensor according to the embodiment. As shown in (a), the two conductive ceramics 1a and 1b are arranged so as to be in contact with the electric power line 5 which is installed above the pantograph (not shown) on the inspection vehicle in a direction orthogonal to the pantograph. .

The above two conductive ceramics 1a and 1b
A constant voltage power supply 2 is connected to both ends of one (here, 1b), and a voltmeter 3 is connected between one end and the same side end of the other conductive ceramics 1a. Reference numeral 4 is a control circuit, and 6 is a probe.

FIG. 3B is an electric circuit diagram of the displacement sensor having the above structure. R ₁₁ and R ₁₂ are resistances of the conductive ceramics 1b, R ₂₁ and R ₂₂ are resistances of the conductive ceramics 1a, and R ₃
Is the resistance of train line 5. Train line 5 is a conductor,
In practice, the resistance R ₃ can be ignored. The resistance of the conductive ceramics is 1Ω or less.

Since the deviation sensor of this embodiment has the above-mentioned structure, the deviation of the electric power line can be measured very accurately. The current from the constant voltage power source 2 passes through the resistor R ₁₂ and is divided into two at the point A, one of which flows to the resistor R ₁₁ and the other to the resistors R ₃ and R ₂₁ and the voltmeter 3.

In this case, R ₃ is practically negligible, and the resistance of the conductive ceramics is about 1 Ω or less, which is negligible compared to the internal resistance of the voltmeter 3, so that the voltmeter 3 and the electric line 5 are electrically conductive. The voltage at the intersection A with the ceramics 1b can be accurately measured.

When the electric line 5 is in contact with the centers of the conductive ceramics 1a and 1b, the resistances R ₁₁ , R ₁₂ and R ₂₁ have substantially the same size. If the displacement sensor is displaced to the left or right and the distance L becomes smaller, the resistance R
₁₁ is small and R ₁₂ is large. Therefore, the voltage at the point A fluctuates linearly as shown in FIG. 2 depending on the resistance value, that is, the distance L.

In this case, the contact resistance between the train wire and the conductive ceramics is not affected. Further, the power consumption of the constant voltage power source 2 can be reduced to several tens of watts.

[0018]

As described above in detail, in the electric line displacement sensor of the present invention, two conductive ceramics are arranged orthogonally to the electric line, and a constant voltage power source is connected to both ends of the conductive ceramics while the other is connected. Since the electric potential at the intersection of the electric line and the conductive ceramics was measured with a voltmeter connected to the conductive ceramics and the deviation of the electric line was measured by the change in the electric potential, the deviation of the electric line It has the advantage that it can be measured by measuring the potential that changes linearly, so that an accurate deviation can be obtained without a measurement error.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of an electric line displacement sensor of an embodiment and its electric circuit.

FIG. 2 is a diagram showing a characteristic curve of the above.

FIG. 3 is a diagram showing a schematic configuration and a characteristic curve of a conventional train line displacement sensor.

[Explanation of symbols]

 1a, 1b Conductive ceramics 2 Constant voltage power source 3 Voltmeter 4 Control circuit 5 Train line 6 Probe

Claims (1)

[Claims] 1. Two conductive ceramics are arranged so as to contact each other in a direction orthogonal to a train line, a constant voltage power source is connected to one end of the conductive ceramics, and the other end of the conductive ceramics is connected to the other end. A voltmeter is connected between one ends of one of the conductive ceramics, and the voltmeter is used to measure the potential at the intersection of the conductive ceramics and the train line to detect the deviation position of the train line. Train line deviation sensor.