One. The CRRC vehicle pantograph online detection system introduction

　　The pantograph of electric locomotive is operated in the high voltage AC environment, and it is easy to appear the phenomenon of arc pulling in the high-speed operation. It is easy to be affected by electromagnetic interference in the transmission process of the conventional analog output sensor, which leads to the reduction of the measurement accuracy and even the normal operation. And before and after the end of the cable connection, the introduction of high pressure easily lead to equipment and personnel safety threats.

　　The OPC series optical fiber of YINHE ELECTRIC converter converts the analog signal to digital signal, through the optical fiber transmission and then revert to the analog signal seamlessly compatible with the original system, electrical isolation, greatly enhance the power system electromagnetic compatibility pantograph online.

Two. Pantograph detection system scene image

Three. Pantograph detection system diagram

Pantograph detection system diagram

　　The analog signal of the acceleration sensor and the force sensor is converted into digital signal through the OPC420 module, and is transmitted to the vehicle through the optical fiber. There are two solutions in the car:

　　Solution 1: the optical fiber signal is reduced to analog signal input to the acquisition system. The advantage of this scheme is that it does not need to change the original system, and it can be applied to the improvement of the whole electromagnetic compatibility of the system. This project is to use the program.

　　Solution 2: the optical fiber signal is reduced to digital signal, directly into the digital system. The advantage of this scheme is that it does not need to simulate the two conversion and acquisition, the system has high precision, simple structure and high reliability.

Four. Pantograph detection system equipment configuration chart

Device name	Type	No.	Remarks
Fiber converter	OPC420	8	Customized ，A pair of a single channel analog input module and a single channel analog output module
Isolated power	Customized	1	With battery power supply voltage output

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