3 research outputs found
Nondestructive and noncontact dielectric measurement methods for transformer oil using free-space microwave measurement system in 19 25 GHz frequency range
Nondestructive, noncontact and real time
evaluation of dielectric properties of low-loss liquids are
important for applications such as service-aged transformer
oil, biomedical, remote sensing and design of radar absorbing
material. Free-space methods were developed to measure
dielectric properties of low-loss liquids at microwave
frequencies. Metal-back method was developed for Freespace
Microwave Measurement system (FSMM). The
purpose of this research is to measure the dielectric
properties of transformer oil by using free-space microwave
measurement system between 18 – 26 GHz (K-band), to
compare measured results with published results for
transformer oil and to collect the variation values of
dielectric properties in microwave frequency between 18GHz
to 26GHz (k-band). FSMM system consists of spot focusing
horn lens antennas, mode transitions, coaxial cables and
vector network analyzer (VNA). Dielectric constants and loss
factors were measured for new transformer oil and all results
close agreed with published data. It is observed that metalback
method is suitable for dielectric measurement of
transformer oil
A vertical wind turbine monitoring system using commercial online digital dashboard
The output of a green energy generator is required to be monitor continuously. The monitoring process is important because the performance of the energy gen- erator needs to be known and evaluate. However, monitoring the generator manu- ally and efficiently is troublesome. Moreover, when most of the energy generator located at uneasy to reach or at a very remote place. Added to the cost, human intervention for the monitoring process contributes to the unnecessary bill. All the highlighted limitations can be overcome using an internet cloud base system and application. Most of the existing data logging instruments use a memory card or personal computer in their operation. The stored data is accessible only at a dedicated computer alone. This work presented a complete energy generator interface with a commercial online digital dashboard. The digital dashboard, parameters of the wind turbine, such as the amount of power generates and the magnitude of instantaneous voltage can be monitored, and the recorded data can be accessed quickly, at any time and anyplace