JPH09156402A - Trolley line abrasion detecting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an abrasion detecting method capable of surely and easily specifying an abraded trolley line. SOLUTION: A detecting wire 3 is stored in a trolley line 1, a prescribed voltage is applied to the detecting wire 3, the current flowing into the abrasion section S of the trolley line 1 from the detecting wire 3 is detected, and the presence/absence and position of the abrasion section S are detected by the impedance calculated from the presence/absence of the current and the current value in this detecting method. Prescribed impedances 4 are inserted in series in the detecting wire 3 at individual drum segments for installing the trolley line 1 so that the calculated impedances have staggered values for the segments where the abrasion section S exists.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trolley wire wear detecting method which utilizes the fact that a detection wire built in a trolley wire comes into contact with a worn portion of the trolley wire. The present invention relates to an easy trolley wire wear detection method.

[0002]

2. Description of the Related Art There is a trolley wire with a detection wire in which one or two detection wires are incorporated in the trolley wire for detecting wear of the trolley wire. The detection wire is insulated from the trolley wire body by an insulating coating. The conventional trolley wire wear detection method will be described below.

As shown in FIG. 3, when the trolley wire 1 having one detection wire built therein is used, the detection device 5 is installed at the starting end of the detection wire 3. When the trolley wire 1 is worn to the position of the detection wire 3 and the insulation coating of the detection wire 3 is broken, the trolley wire main body 2
And the detection line 3 electrically contact with each other (contact resistance 7).

At this time, a voltage V is applied between the detection wire 3 and the trolley wire main body 2 from the detection device 5 installed at the starting end of the detection wire 3. If there is no worn portion, no current flows through the detection line. Therefore, if the presence or absence of the current I is detected, the presence or absence of the worn portion can be detected. When the current I is detected, the detected resistance value R = V / I is calculated from the relationship with the applied voltage V. Detection resistance value R
Is the resistance value Rk per unit length of the detection wire and the position (distance from the starting end) of the worn portion S where the electrical contact occurs.
And R, that is, R = Rk · X. Therefore, the position of the worn portion S can be detected. The contact resistance value Rc is ignored.

Further, as shown in FIG. 4, when the trolley wire 1 having the two detection lines 3a and 3b built therein is used, the detection device 5 is installed at the start ends of the detection lines 3a and 3b and the two detection lines 3a and 3b are detected. Short the ends of the wires together. The trolley wire 1 has worn down to the position of the detection line and any of the detection lines (3b)
If the insulation coating of the wire breaks, the trolley wire body 2 and its detection wire 3
Electrical contact is made with b (contact resistance 7).

At this time, a voltage V is applied between the detection lines 3a and 3b and the trolley wire body 2 from the detection device 5 installed at the beginning of the detection line. If there is no worn portion S, no current flows through any of the detection lines. Therefore, the presence or absence of the worn portion can be detected by detecting the presence or absence of the currents I1 and I2. The current I
When 1 and I2 are detected, the detected resistance values R1 = V / I1 and R2 = V / I2 are calculated from the relationship with the applied voltage V, respectively. Since a current flows through the detection line 3a where no direct contact occurs through the end, when the distance from the start end to the end is L, R1 = Rk · (2L−X) + Rc The detection line 3b where contact occurs Has the relationship of R2 = Rk.X + Rc, as in the above-mentioned prior art. The wear position X is detected from this relational expression.

[0007]

In the first prior art,
When the contact resistance value Rc is not negligible, the wear portion position X cannot be detected.

In the first and second prior arts, the currents I, I
Since 1 and I2 are analog values, an A / D conversion circuit for A / D converting them is required, which complicates the circuit. The complexity of the circuit increases the manufacturing cost. Also, if the circuit becomes complicated, it becomes easy to pick up various electromagnetic induction noises such as train current existing at the installation location.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and provide a trolley wire wear detecting method which can surely and easily identify a worn trolley wire.

[0010]

In order to achieve the above object, the present invention has a trolley wire having a detection wire built-in, a predetermined voltage is applied to the detection wire, and a wear portion of the trolley wire is applied from the detection wire. In the trolley wire wear detection method of detecting the current flowing into the trolley wire and detecting the presence or absence and the position of the worn portion by the impedance calculated from the presence or absence of this current and the current value, the above detection is performed for each drum unit section in which the trolley wire is laid A predetermined impedance is inserted in series in the line, and the calculated impedance takes a discrete value depending on the section in which the worn portion exists.

It is also possible to determine the impedance judgment value for each section and compare the calculated impedance with the judgment value of the impedance for each section to specify the section where the wear portion exists.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION When a trolley wire is laid, all wires are constructed by sequentially connecting trolley wires each having a predetermined length in series. This one is called a drum. For example,
On the Shinkansen, one drum is about 1.5 km. If wear occurs, the trolley wire will be replaced in drum units.

As shown in FIG. 1, when using a trolley wire having one detection wire built in the main body, the trolley wire 1 with the detection wire is serially arranged in the order of drums # 1, # 2, ..., #n. All lines are constructed by connecting to. The length of the trolley wire in each drum becomes l1, l2, ..., In ,. The trolley wire main bodies 2 of these trolley wires are connected in series over all the wires. On the other hand, the detection line connecting resistor 4 is inserted into the detection line 3 for each section of the drum unit. This resistance value is Rj.

The detection device 5 is installed at the beginning of the detection line 3.
This detection device 5 applies a voltage V (direct current or alternating current may be applied) between the detection line 3 and the trolley wire body 2 and detects a current I flowing through the detection line 3 at that time. 6
Is a trolley power supply.

Since there is no current flowing through the detection line 3 if there is no worn portion, the presence or absence of a worn portion can be detected by detecting the presence or absence of the current I.

The trolley wire 1 is worn to the position of the detection wire 3, the insulating coating of the detection wire 3 is broken, and the trolley wire main body 2 and the detection wire 3 are broken.
Shall be in electrical contact with. It is assumed that the worn portion S is in the n-th section (drum #n) from the start end, and the contact resistance 7 thereof is shown by a resistor symbol. This contact resistance value is Rc.

The detected resistance value R calculated from the applied voltage V and the current I is a resistance value Rk per unit length of the detection line 3.
And the position of the worn portion S, the sum of the resistances of the detection line connecting resistors 4 up to that section is added. Therefore, the detected resistance value R takes a scattered value depending on the section in which the worn portion S exists, and a large difference occurs.

In order to determine the drum, that is, to identify the presence section of the worn portion, a determination value (threshold value) of the detection resistance value is set in advance for each section, and the calculated detection value is shown in Table 1. The resistance value R is compared with the threshold value for each section.

[0019]

[Table 1]

That is, the detected resistance value R is almost 0 to Rk · l.
It can be seen that the wear portion S exists in the drum # 1 closest to the starting end in the range of 1 + Rj. Generally, if the value of R is in the range of Rk · (l1 + l2 + ... + ln ₋₁ ) + Rj (n−1) <R ≦ Rk · (l1 + l2 + ... + ln ₋₁ + ln) + Rj · n, the wear part S exists on the drum #n. I understand that Since the trolley wire 1 in which the worn portion S is found is exchanged in drum units, it is sufficient to specify the existing section of the worn portion S in this way.

In this method, the drum judgment can be made only by comparing the detected resistance value R and the threshold value. The determination circuit for that purpose can be configured by a simple comparator. In the conventional method of detecting the worn portion position X, a complicated A / D conversion circuit is required to perform strict detection, but this method does not require a complicated A / D conversion circuit.

Considering the contact resistance value Rc, Rc
If ≦ Rj, the drum judgment is always correct. When Rc> Rj, the drum judgment becomes inaccurate. However, even if the judgment section is deviated due to the large contact resistance, it is certain that there is a worn portion in the drum number smaller than the judgment result drum #n, and effective information for the drum judgment work is provided. To be done.

Next, as shown in FIG.
When a trolley wire having a built-in detection wire is used, the trolley wire 1 with the detection wire is sequentially connected in series in drum units to form the whole wire. Here, all lines are drums # 1, #
Although there are three sections of 2 and # 3, it goes without saying that any number of sections may be used. The length of the trolley wire 1 in each drum is 11, 12, and 13 in sequence. The trolley wire main bodies 2 of these trolley wires 1 are connected in series over all the wires. On the other hand, the detection line connecting resistor 4 is inserted in the detection lines 3a and 3b for each section of the drum unit. This resistance value is Rj.

The detector 5 is installed at the start ends of the detection lines 3a and 3b, and the ends of the two detection lines 3a and 3b are short-circuited. This detection device 5 includes the respective detection lines 3a,
A voltage V (direct current or alternating current may be applied) between the contact wire 3b and the trolley wire main body 2 and the detection wire 3 is applied at that time.
The currents I1 and I2 flowing through a and 3b are detected. 6 is a trolley power supply.

If there is no worn portion, no current flows through the detection line. Therefore, the presence or absence of the worn portion can be detected by detecting the presence or absence of the currents I1 and I2.

When the trolley wire 1 is worn to the position of the detection wire and the insulating coating of any of the detection wires 3a and 3b is broken, the trolley wire main body 2 and the detection wire are electrically contacted.

It is assumed that the worn portion S is in the third section from the start end, and the contact resistance 7 is shown by a resistor symbol.
This contact resistance value is Rc.

The detected resistance values R1 and R2 calculated from the applied voltage V and the currents I1 and I2 are the product of the resistance value Rk per unit length of the detection line and the position of the worn portion S, and up to that section. The value is the same as the sum of the resistances of the detection line connection resistor 4, or the same value considering that the current flows through the termination. The detection resistance values R1 and R2 are the wear parts S
Depending on the section in which is present, the values will vary and a large difference will occur.

In order to determine the drum, that is, to identify the existing section of the worn portion S, a judgment value (threshold value) of the detected resistance value is set in advance for each section, and is calculated as shown in Table 2. The detected resistance values R1 and R2 are substituted into R and compared with the threshold value for each section.

[0030]

[Table 2]

That is, the detection resistance value R1 or R2 is almost zero.
It can be seen from the result that within the range of Rk · l1 + Rj, the worn portion exists on the drum # 1 closest to the starting end. Further, the detection resistance value R1 or R2 is Rk · (l1 + 2l2 + 2l3)
It can be seen that a worn portion is present on the drum # 1 even when the friction coefficient is larger than + 4Rj.

Also in this method, the drum determination can be made only by comparing the detected resistance values R1 and R2 with the threshold value. And this method is also effective for disconnection of the detection line.
That is, when the detection line 3b is disconnected between the worn portion S and the detection device 5 (the position with the mark X), the current I2 = 0. Therefore, the calculated R2 = infinity, the bottom column of Table 2 is satisfied, and the drum # 1 is determined. However, from the determination of the detection resistance value R1 of the detection line 3a, the correct determination of the drum # 3 can be obtained. Therefore, ignore the judgment that the current is 0,
By adopting the judgment that the current is not 0, the correct judgment can be obtained even if the detection line is broken.

Although the voltage V applied from the detection device 5 is direct current and the impedance inserted into the detection line 3 is resistance 4, the applied voltage V may be alternating current, and the impedance may be other than resistance.

[0034]

The present invention exhibits the following excellent effects.

(1) Since the detected resistance value varies depending on the section in which the worn portion exists, it is possible to reliably specify the section in which the worn portion exists.

(2) Since the section can be specified only by comparing the magnitudes, the circuit configuration becomes simple.

[Brief description of the drawings]

FIG. 1 is a circuit diagram for implementing the method of the invention.

FIG. 2 is a circuit diagram for implementing the method of the present invention.

FIG. 3 is a circuit diagram showing a conventional example.

FIG. 4 is a circuit diagram showing a conventional example.

[Explanation of symbols]

 1 Trolley wire 2 Trolley wire main body 3, 3a, 3b Detection wire 4 Detection wire connection resistor (impedance) 5 Detection device 6 Trolley power supply 7 Contact resistance S Wear part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akira Tokushima 5-1-1 Hidakacho, Hitachi City, Ibaraki Prefecture Inside the Hidaka Factory, Hitachi Cable Co., Ltd. (72) Inventor Hiroyoshi Soda 5 Hidakacho, Hitachi City, Ibaraki Prefecture No. 1-1, Hidaka Factory, Hitachi Cable, Ltd.

Claims (2)

[Claims] 1. A trolley wire is provided with a detection wire, a predetermined voltage is applied to this detection wire, and a current flowing from this detection wire into a worn portion of the trolley wire is detected. In the trolley wire wear detection method for detecting the presence or absence and the position of a worn portion by the calculated impedance, a predetermined impedance is inserted in series to the detection line for each drum unit section in which the trolley wire is laid, and the above is calculated. A trolley wire wear detection method characterized in that the impedance has a discrete value depending on a section in which a wear part exists. 2. The presence section of the wear part is specified by determining an impedance determination value for each section and comparing the calculated impedance with the impedance determination value for each section. The trolley wire wear detection method according to 1.