JPS5834340A - Detector for breakage of pantograph - Google Patents

Abstract

PURPOSE:To eliminate the influence of a noise such as a disturbing radio wave while maintaining high insulation by utilizing light for power transmission to a primary circuit, and also using the output light of the primary circuit for power transmission to a secondary circuit. CONSTITUTION:Light of frequency f0 from a light emitting device 16 is passed through an optical transmission line 22 to illuminate a photoelectric converting element 7, generating electromotive force of frequency f0. While a pantograph 1 and a primary detecting circuit A are both normal, light emitting elements 3 and 4 emit light at frequency f0, and the light of frequency f0 strike photodetecting elements 12 and 13 to energize relays 14 and 15. Optical amplifiers 10 and 11 are narrow-band selective amplifiers with a center frequency f0. If, however, the pantograph 1 is broken and a detection line 2 is cut off, neither the light emitting element 2 nor the photodetecting element 12 operates and the relay 14 is unenergized to close a breakage detecting circuit 23, indicating the breakdown. The failure of an optical transmission line 20 is the same. If one of the light emitting device 16, optical transmission lines 21 and 22, light emitting element, a resistance 6, the photoelectric converting element 7, and the optical amplifier 11 breaks down, the relay 15 is unenerigized and the defect detecting circuit 24 indicates the defect.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting damage to a pantograph of a train.

Train pantographs can be damaged by collisions with obstacles or flying objects while the train is running.If one pantograph is damaged, if measures are not taken such as lowering the bank graph of the following vehicle, the following pantographs will also be damaged. Damage may occur.

For this reason, a flexible insulated conductive wire is provided on the pantograph so as to be cut when the pantograph is damaged, and this insulated conductive wire is connected in parallel with the variable frequency coil of the LC resonant circuit, and the LC resonant circuit is connected to the receiving circuit. A device has been proposed that is electromagnetically coupled to a receiving coil of the pantograph, and allows the receiving circuit to detect a change in the oscillation frequency of the LC resonant circuit due to the breakage of the insulated conductive wire due to damage to the pantograph.

However, in this device, the variable frequency coil and the communication coil must be electromagnetically coupled with electrical insulation in terms of temperature, which makes the device larger and more complicated. changes, making it susceptible to electromagnetic noise.

SUMMARY OF THE INVENTION An object of the present invention is to provide a simple and inexpensive damage detection circuit for a pantograph that can maintain high electrical insulation between the damage detection line side and the communication side and is not affected by noise.

Hereinafter, the present invention will be described (5) based on the embodiments shown in the drawings. explain.

In the figure, A is a primary detection circuit installed outside the vehicle, and is a primary detection circuit installed outside the vehicle. Damage detection wire 21 Light emitting element 3.4
, current limiting resistor 5.6. It is equipped with a photoelectric conversion element 7 that generates a photovoltaic force when the light changes. Damage detection line 2
is a flexible insulated conductor, which is run along the pantograph 1 and is cut when the pantograph is damaged. The damage detection line 21, the light emitting element 3, the resistor 5, and the photoelectric conversion element 7 are connected in series to form one closed circuit, and the light emitting element 4 and the resistor 6 are connected in series to the photoelectric conversion element 1. and form another closed circuit. In addition, 1 light emitting element 3.4. The resistors 5, 6 and the electric converter cable 7 are arranged in a closed box 8, which box 8 is arranged in the pantograph device of the vehicle.

(5) (4) C is a secondary detection circuit installed indoors in the vehicle, and includes two narrowband source amplifiers 10 that amplify the electromotive force of the light receiving elements 12 and 13 installed on the input side. .11, a relay 14.15 excited by the output of the optical intensifier 10.11, and a light emitter 16 that repeatedly emits light at a narrow band frequency near the center frequency of the original intensifier 10.11. We are prepared. The light emitter 16 includes a constant frequency oscillation circuit 17 and an output of p.
It is composed of a light emitting element 18 that emits light.

20 is an optical transmission line that optically couples the light emitting element 3 and the light receiving element 12; 21 is an optical transmission line that optically couples the light emitting element 4 and the light receiving element 13;

22 is an optical transmission line that optically couples the light emitting element 18 and the photoelectric conversion element 7. Each optical transmission line 20, 21, 22 is made of a known optical fiber that prevents disturbance light from entering, such as a glass 7 eyeper, and an insulator for electrically insulating the pantograph device from the vehicle body. It penetrates the hollow part of the

23 is a falling contact 14 of the relay 14. 24 is a damage detection circuit in which the lifting contact 151 of the relay 15 is connected in series with the falling contact 15. of the relay 15. This is a failure detection circuit equipped with a

In this device, the emitter 16 has a frequency f. When the light is emitted, the light passes through the optical transmission line 22 to the photoelectric conversion element 7.
is incident on the photoelectric conversion element 7 at a frequency t. generates an electromotive force. Therefore, if the pantograph 1 and the -order detection circuit A are normal, the light emitting elements 3 and 4 will have the frequency f. Since the light is emitted at a frequency f0, the light is incident on the light receiving element 12.13 at a frequency f0, thereby exciting the relay 14.15.

Therefore, both the damage detection circuit 23 and the failure detection circuit 24 are closed. At this time, since the optical amplifiers 10 and 11 are narrow band selective amplifiers with a center frequency f0, the frequency f0
The photovoltaic force is not increased.

However, if the pantograph 1 is damaged and the damage detection wire 2 is cut, the light emitting element 3 does not emit light, so no light enters the light receiving element 12 and the relay 14 becomes de-energized, but the relay 15 does not allow the light emitting element 4 to emit light. Therefore, the failure detection circuit 24 is closed and the damage detection circuit 23 is closed, which means that the pantograph 1 is damaged.

The same operation occurs when the optical transmission line 20 fails.

In addition, a light emitter 16, optical transmission lines 21 and 22, a light emitting element 4,
If any one of the resistor 6, photoelectric conversion element 7, and optical amplifier 11 fails, the relay 15 becomes de-energized, which means that the failure detection circuit 1824 is closed, indicating that the device is in failure. In this case, the damage detection circuit 23 is closed.

The above-mentioned device is provided with a light emitting element 4, an optical transmission line 21, an optical amplifier 11, and a relay 15 in order to distinguish between a failure of the detection device and damage to the pantograph. It is not necessary when a malfunction is treated as damage to the pantograph.

As described above, according to the first invention, power is transmitted using light to the primary detection circuit that performs primary detection of damage to the pantograph, and the output signal of the negative detection circuit is transmitted to the secondary detection circuit using light. Because of the transmission, it is possible to maintain a high degree of electrical insulation between the secondary detection circuit and the secondary detection circuit, and it is not affected by noise such as disturbance radio waves. Moreover, it has a simple structure and is inexpensive. , it is possible to quickly detect damage to the Nipantograph (9). Furthermore, according to the second aspect of the invention, since failure of the detection device is detected, damage to the pantograph and failure of the detection device can be accurately distinguished.

[Brief explanation of the drawing]

The figure is a diagram showing an example of an electric circuit of a detection device according to the present invention. A knee detection circuit, B: secondary detection circuit, 1: pantograph, 2: damage detection line, 3.4゜18: light emitting element, 7: photoelectric conversion element, 10゜11: optical amplifier, 12.13 : Light receiving element, 14.15: Relay, 16: Light emitter. Patent applicant Nippon Ibago Co., Ltd. (10)

Claims (2)

[Claims] (1) A damage detection line that is cut when the pantograph is damaged, a light emitting element, and a photoelectric conversion element that generates an electromotive force upon receiving light are connected in series to form a °C-primary detection circuit and input A narrow-band original amplifier that amplifies the electrical signal according to the light incident on the light-receiving element installed on the side, and a relay installed on the output side of this optical amplifier, and a narrow-band light emission repetition frequency. A secondary detection circuit is configured in the light emitter that emits light, and optical transmission is performed between the light emitting element of the second detection circuit and the light receiving element provided on the input side of the original amplifier of the secondary detection circuit. Joined by road. A damage detection device for a pantograph, in which the light emitter and the photoelectric conversion element are coupled through another optical transmission path. (2) A circuit in which a damage detection line that is cut when the bank graph is damaged, a first light emitting element, and a photoelectric conversion element that generates an electromotive force upon receiving light are connected in series; A primary detection circuit is constituted by a circuit in which the light emitting elements, yt and x, and the photoelectric conversion element are connected in series, and a first amplifying electric signal corresponding to the light incident on the light emitting element provided on the input side. and a second narrowband optical amplifier;
A secondary detection circuit is constituted by two relays individually installed on the output side of the second source amplifier and a light emitter that emits light at a narrow-band light emission repetition frequency. The element and the light receiving element of the first optical amplifier are coupled through a first optical transmission line, and the second light emitting element and the light receiving element of the second optical amplifier are coupled.
A damage detection device for a pantograph, which comprises coupling the light emitting device and the photoelectric conversion element through a second optical transmission line, and coupling the light emitter and the photoelectric conversion element through a VG3 optical transmission line.