JP2741295B2 - Pantograph measurement method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring a separation between a pantograph and an overhead line in an electric railway.

[0002]

2. Description of the Related Art In a conventional method for determining the separation between an overhead line and a pantograph in an electric railway, a voltage applied to the pantograph is measured by a PT or a resistive voltage dividing method, and the voltage is 0 volt (based on track voltage). There is a method in which the state of ()) is regarded as a wire break. Also, by connecting the two pantographs with buses and monitoring the current flowing through the buses, calculating the separation of the two pantographs, and monitoring the magnitude of the load current flowing through the pantograph, the time when the current reaches 0 amperes There is also a method of making the wires disconnected.

[0003]

However, in the conventional method of monitoring the voltage or current to determine the disconnection from the amount of electricity, when an arc is generated between the overhead wire and the pantograph, the overhead wire and the pantograph are mechanically connected. In spite of the separation, the short circuit is electrically short-circuited by the arc, the overhead wire and the pantograph have the same potential, and the current continues, so that the disconnection cannot be detected.

[0004] Therefore, the present invention is to mount a vibration sensor on a boat, which is a current collector of a pantograph, and measure the motion of the boat to know an accurate line separation.

[0005]

According to the present invention, a vibration sensor is provided on a boat of a pantograph. A signal containing the disconnection information is extracted from the output of the vibration sensor using a filter. The effective value of the amplitude of this signal is compared with a reference value to determine whether the signal is out of line. An optical fiber acceleration sensor can be used as the vibration sensor.

[0006]

According to the method for measuring a derailment of the present invention using the above method,
Since the movement of the pantograph boat is directly monitored, accurate measurement of the disconnection can be performed regardless of the presence or absence of an arc.

FIG. 3 shows the vibration of the pantograph boat.
This will be described with reference to FIG. Since the vehicle body 6 is supported by the spring 15 of the bogie 17, the vibration of the pantograph 3 is accompanied by the vibration of the track 16. This is caused by a seam of the track 16 or the like, and is low-frequency vibration. The pantograph 3 itself also presses the boat 5 against the overhead wire 4 by the pushing force of the spring 18, and the boat 5 is designed to follow the overhead wire 4 well. Vibrates at the frequency. The vibration caused by the spring 18 is caused by a support such as a column serving as a fixing point of the overhead wire 4.
Further, the contact surfaces of the boat 5 and the overhead wire 4 of the pantograph 3 have fine irregularities, and sliding vibration occurs. The frequency of this sliding vibration is the highest. FIG. 2 shows the relationship between the frequencies of the above three vibrations. Reference numeral 12 denotes the spring of the bogie, and reference numeral 13 denotes the springs 18 and 14 of the pantograph 3 due to the sliding vibration between the boat 5 and the overhead wire 4.

Of these three signals, the sliding vibration 14 is due to the contact between the overhead wire 4 and the boat 5, and if the overhead wire 4 and the boat 5 are mechanically separated, the boat 5 It becomes freer than the overhead wire 4, and the sliding vibration signal 14 becomes zero.

As described above, since the movement of the boat 5 of the pantograph 3 can be divided into three by the frequency, the sliding vibration signal can be extracted from the vibration signal of the boat 5 using a filter.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. Here, an acceleration sensor is used as the vibration sensor. As the acceleration sensor, FA2010 (main body) and FAP1 (sensor probe) manufactured by Takatake Seisakusho using an optical fiber are used. FAP1 is small and lightweight,
It does not affect its movement when attached to a pantograph boat. Further, since the optical fiber is used, the influence on the electrical insulation between the measuring instrument main body and the pantograph is small. The acceleration detector 1 of the FAP 1 is attached to the boat 5 of the pantograph 3. The optical fiber 2 of the FAP 1 is connected to the FA 2010 body 7 on the vehicle. The FA 2010 main body 7 is installed in the vehicle body 6 and converts an optical signal into an electric signal and outputs the electric signal. The electric signal representing the acceleration is connected to a comparator 10 via an effective value circuit 9 of a bandpass filter 8. The band-pass filter 8 extracts only the sliding vibration signal component representing the contact state between the boat 5 and the overhead wire 4, converts it into an effective value of the amplitude by the effective value circuit 9, and compares it with the reference voltage by the comparator 10. , It is determined whether or not it is a wire break, and a wire break signal 11 is output.

Referring to FIG. 4, the signal waveform of each section will be described. FIG. 4A shows an output signal of the optical fiber accelerometer when only the vibration by the spring 15 is measured. Similarly,
(A), (b), and (c) are output signals when the vibration caused by the spring 18 and the sliding vibration is measured by the optical fiber accelerometer 7 independently. When the vibration of the boat 5 is actually measured, a composite of these three vibration waveforms is output from the optical fiber accelerometer 7 as described in the operation. This is shown in (d). The band-pass filter 8 allows only the sliding vibration signal component shown in (c) to pass, and the other (a),
The signal shown in (b) is blocked. Bandpass filter 8
Is shown in (e). (E) is an AC signal, which is difficult to compare in magnitude as it is, and is converted to a DC signal representing the effective value of the amplitude by the effective value circuit 9. This signal is shown in (f). This signal is compared with a reference voltage by the comparator 10.

Although the above is an example using an optical fiber acceleration sensor, other vibration sensors may be used as long as an acceleration signal can be obtained.

[0013]

As described above, by monitoring the vibration of the pantograph boat, the movement of the boat can be directly monitored, and the separation between the pantograph boat and the overhead wire can be accurately measured. .

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of a method for measuring a disconnection according to the present invention.

FIG. 2 is a diagram illustrating frequency characteristics of vibration of a boat board of a pantograph.

FIG. 3 is a diagram for explaining vibration of a boat board of a pantograph.

FIG. 4 is a diagram for explaining signal waveforms of respective units.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Acceleration sensor's acceleration detection part 2 Optical fiber 3 Pantograph 4 Overhead wire 5 Boat board 6 Body 7 Optical fiber accelerometer main body 8 Bandpass filter 9 Effective value circuit 10 Comparator 11 Disconnection signal

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Akihiro Miyaji 3-1, Yoshino-cho, Nishibiwajima-machi, Nishi-Kasugai-gun, Aichi Prefecture Inside the Technical Development Center, Takatake Works Co., Ltd. (72) Inventor Akira Ito Nishi-Biwajima, Nishi-Kasugai-gun, Aichi Prefecture 1-chome, Yoshino-cho, Takagae, Ltd. Technical Development Center Inspector Takayuki Chima (56) References JP-A-49-25608 (JP, A)

Claims (2)

(57) [Claims] 1. A pantograph disconnection measuring method for extracting a sliding vibration component between a pantograph and an overhead wire from an output signal of a vibration sensor mounted on a pantograph boat, and comparing the magnitude of the effective value of the amplitude with a reference value. . 2. The method according to claim 1, wherein an optical fiber acceleration sensor is used as the vibration sensor.