The research of OLTC on-line detection system based on embedded and wireless sensor networks

The fault rate of on-load tap-changer (OLTC) has always been in a high level, and that is exactly the primary reason of transformer faults. As a result, an on-line detection method of OLTC was proposed. The embedded platform and wireless sensor network (WSN) technology was introduced into the on-line detection system. WSN was used to obtain OLTC status information. The embedded platform software, which was integrated data processing and fault diagnosis technologies, could realize the function of displaying and saving real-time data, fault diagnosis and so on. Besides, an analysis method of OLTC vibration signal was proposed on the basis of Empirical Mode Decomposition (EMD) and Fast Fourier Transformation (FFT).