The Research of Vibration Monitoring System for Transformer Based on Optical Fiber Sensing

Transformer is the key equipment in power system and its stability directly affects the stability of power grid. Under normal, the magnetostriction of silicon steel sheet will cause the vibration of the transformer's core and the winding will vibrate by the electromagnetic force of loading current. We can know the operation condition of transformer by Monitoring vibration. In this paper, a high-sensitivity fiber Bragg grating vibration sensor is used to monitor the vibration signal of the transformer during real-time on-line monitoring. Compared with the existing transformer winding deformation test technology, the vibration analysis method has no electrical connection with the entire power system. The normal operation has no effect, and can achieve the purpose of online monitoring safely and reliably. It can not only detect the winding deformation fault caused by the short circuit, but also detect the looseness of the structural parts such as the iron core and the tap changer.