Wireless monitoring and analysing system of dissolved gases in the transformer oil

Potential faults can be timely detected through online monitoring to the dissolved gases in the transformer oil so as to improve the safety of the electric power system. Firstly, the online monitoring technology of dissolved gases in the transformer oil is discussed in detail. Then, a low cost monitoring method to the characteristics gas dissolved in the transformer oil by using the semiconductor sensor array is put forward in this paper. In order to solve the cross sensitivity problem of a single gas sensor to the gaseous mixture, a signal-purifying method of gas sensor array based on neural network is introduced and used to settle the cross sensitivity problems among the characteristic gases when different sensors are used to monitor the gases concentration in the system. On this basis, a wireless monitoring system to the dissolved gases in the transformer oil is developed. The development system can realize to on-line monitor the characteristic gases dissolved in the transformer oil such as hydrogen, methane, ethane, ethene, acetylene, carbon monoxide and carbon dioxide. And, the transformer condition information can also be transmitted in a wireless, long-distance, rapid and low-cost way for the system.