JPH03175301A - Detecting method for trolley line abrasion - Google Patents

Abstract

PURPOSE:To correctly detect the abrasion and the position of the abrasion of a trolley line by comprising steps of building two detecting lines in the trolley line, connecting terminal ends of the detecting lines and letting a current flow at starting ends of the detecting lines. CONSTITUTION:Two detecting lines 5 are built in a main body 3 of a trolley line 6. The main body 3 is connected to a power source 1 of the trolley line. A detecting voltage source 2 is connected to starting ends 14 of the detecting lines 5. The terminal ends 13 of the detecting lines are connected with each other. When the main body 3 is worn out and comes in touch with the detecting lines 5 at a point of the abrasion 4, detecting currents I1, I2 start to flow in the detecting lines 5 from the voltage source 2. The abrasion of the trolley line 6 can be detected by this generation of the currents I1, I2. Moreover, the distance from the starting ends 14 to the point of the abrasion 4 can be calculated from the ratio of the currents I1, I2, whereby the position of the abrasion can be detected.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for detecting trolley wire wear and tear, in which a detection wire is built into the trolley wire, and the detection wire detects the trouble and position of the trolley wire. It is something.

[Conventional technology] Trolley wires for railways are overhead wires placed at a certain height above the rail surface, and contact the pantographs of electric cars to supply power to the electric cars, but electrical and mechanical wear caused by minute sparks occur. Easy to occur.

Conventionally, the trolley wire has a built-in detection wire covered with an insulating material, and it detects when the trolley wire is worn down to the built-in detection wire due to contact with the pantograph, and the trolley wire and the detection wire are electrically connected. Abrasion and its location are detected from changes in the current value of the wire.

This conventional detection method will be explained with reference to FIG.

FIG. 3 shows the electrical connection relationship between the trolley wire body and the detection wire. In the figure, the contact wire 36 shown in a circle is
It consists of a trolley wire main body 33 and a detection wire 35. A trolley wire power supply 31 is connected to the starting end side of the trolley wire main body 33, and the trolley wire main body 33 on the starting end side and the detection wire 3
A detection voltage source 32 is connected to the 5th line.

Now, when the trolley wire wears down to the built-in part of the detection wire, the coating of the detection wire breaks and the trolley wire body and the detection wire come into contact.

Now, in FIG. 3, when 6 contacts occur, with the contact point being 34, the detection voltage source 32 causes the trolley wire main body 3 to
A detection current (I) 37 flows between the detection line 3 and the detection line 35. By detecting this detection current (I) 37, it is detected that wear has occurred.

The relational expression between the voltage ■ of the detection voltage source 32 and the detected voltage iI is V
= I (Rt fRc しR) and f. (Rt.
:Resistance of the trolley wire body up to the wear point, contact resistance between the RC nitrous wire body and the detection wire, R: resistance of the detection wire up to the wear point) Here, the resistance R1 of the trolley wire body and the contact resistance Rc are detected. If it is negligibly small compared to the line resistance R, then V=I R (1).

If the resistance of the detection wire is uniform and the resistance per unit length is Ro, and the distance from the starting end to the wear point is MJI, then R = Ro J. Substituting this into equation (1) and rearranging it, ■ j = ... (2) IR.

becomes.

) If the value of detection current I can be detected from the formula, V and R
Since o is a constant value, the distance Mj from the starting end to the wear point, that is, the wear position of the trolley wire can be calculated.

[Problem to be solved by the invention] However, if the contact resistance RC at the wear point and the resistance Rt of the trolley wire cannot be ignored with respect to the detection wire resistance R, the distance to the wear cannot be detected by the conventional method.
Moreover, it is necessary in many countries to accurately detect the detection current (I) 37 due to inductive noise or the like. Therefore, it is very difficult to detect the distance to the point of wear and tear using conventional methods.

SUMMARY OF THE INVENTION An object of the present invention is to provide a new method that overcomes the drawbacks of conventional methods and facilitates the detection of wear and the position of wear on a trolley wire.

[Means for solving the problems] The gist of the present invention is to incorporate two detection wires into the trolley wire, electrically connect the terminal ends of these detection wires, and apply current to the starting ends of both detection wires. At the same time, the wear position of the trolley wire is detected from the current ratio of both detection wires.

[Function] According to the above configuration, two detection wires are built-in and the terminal ends of both detection wires are connected. Therefore, when the trolley wire is worn out and one of the detection wires comes into contact with the trolley wire, both detection wires are connected. A current flows through the contact wire, and wear of the trolley wire can be determined, and the wear position can be calculated from the ratio of the current flowing through both detection wires.

[Example] Hereinafter, preferred embodiments of the present invention will be described based on the accompanying drawings.

First, FIG. 2 shows a cross section of a grooved trolley wire 6 according to the present invention, in which a support groove 3a is formed in the trolley wire main body 3, and two detection wires 5 covered with an insulating material 5a are inserted in the groove 3a for support.
is built-in.

Next, the electrical connection relationship between the trolley wire main body 3 of the trolley wire 6 and the two detection wires 5 will be explained with reference to FIG.

The circled trolley wire 6 is connected to the trolley wire main body 3 and the two detection wires 5 built into it, as explained in FIG.
Consists of 5. The trolley wire main body 3 is connected to the trolley wire power source 1, the detection power source 2 is connected to the starting ends 14 of both detection wires 55, and the terminal ends 13 are connected to each other.

Suppose now that the trolley wire main body 3 is worn out and the trolley wire main body 3 and the detection wire 5 come into contact at the illustrated wear point 4. In this case, the resistance 15 of the trolley wire body 3 up to the wear point 4 is R1,
The contact resistance 16 between the trolley wire body 3 and the detection wire 5 is RC, the resistance 11 from the start end 14 to the wear point 4 of the detection wire 5 on the contact side is R1, and on the other hand, from the beginning f4A14 to the end @13 to the wear point 4. Let R2 be the resistance 12 of the detection line 5.

Now, when the trolley wire main body 3 and one of the detection wires 5 come into contact at the wear point 4, both detection wires 5.5 and 5.
Detection currents (II) 9 and (I2) 10 flow therein. The wear of the trolley wire can be detected by the generation of the currents I+ and I2.

Furthermore, II, I2. The relational expression between R1 and R2 is II R+
=I2 R2...(3).

Equation (3) does not depend on the contact resistance RC and the resistance Rt of the trolley wire body. In addition, if the detection wire resistance is uniform, the resistance per unit length is Ra + the distance from the starting end to the wear point is 1.
, if the trolley wire length is L, then R1=Ro J! , R2=
Ro (2L-j!>).

Substituting these equations into equation (3) and rearranging it, we get 1shiI2/I
It becomes I.

From equation (4), the distance Mj from the start @14 to the wear point 4 can be calculated from the ratio of the detection currents I+ and I2, and the wear position can be detected.

The detection voltage source 2 shown in FIG. 1 can also be used as a current source to detect wear. Also, both direct current and alternating current are possible.

Also, if a resistor is inserted at the starting point 14 of each detection line 5.5, the detection current (11)9. <12) 10 can be detected as a voltage.

Further, although an example has been shown in which the two detection wires 5.5 are built into the trolley wire main body 3 and are provided on the left and right sides, the present invention is not limited to this, and the detection wires 5.5 may be provided on the top and bottom.

[Effects of the Invention] As is clear from the above explanation, the present invention provides the following effects.

(1) By incorporating two detection wires into the contact wire and detecting the current flowing through the detection wires during wear and calculating the detected current ratio, even if the contact resistance between the contact wire and the detection wire is large, Accurate wear position can be detected without relying on the contact resistance.

2) Since the two detection lines are electrically connected at the beginning and end, the detection current can be easily detected without being affected by inductive noise, and accurate wear detection is possible. .

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a sectional view of a trolley wire according to the present invention, and FIG. 3 is a diagram showing a conventional example. In the figure, 1 is a trolley wire power supply, 2 is a detection voltage source, 3 is a trolley wire body, 4 is a wear point, 5 is a detection wire, and 6 is a trolley wire.

Claims (1)

[Claims] 1. The trolley wire has two detection wires built-in, the terminal ends of these detection wires are electrically connected, and a current is passed through the starting ends of both detection wires to detect wear of the trolley wire and to control the current of both detection wires. A method for detecting wear of a trolley wire, characterized by detecting a wear position of the trolley wire from a ratio.