Application of Partial Discharge Online Monitoring Technology in ± 660kV Converter Transformer
The partial discharge detection technology (UHF) is specially used in YD-B Phase of ± 660kV converter trans- former pole I system, in connection with overheating failure problems. Through analysis by PRPD map to strengthen the monitoring for partial discharge defective of converter transformer, the continuous tracking for the running state of con- verter transformer can be achieved. Application results show that: the signal of partial discharge characteristics can be ef- fectively found inside the converter transformer through UHF Online Monitoring techniques, which has good sensitivity and Interference capability, providing guarantee for safe and stable running of power equipment.
The Research of PLC and Touch Screen in the Erosion of Coating of Wind Turbine Blade
Inner Mongolia is located in the north of China, the development of wind power industry is outstanding. Be- cause of the surrounding environment destruction and frequent sandstorm phenomena in recent years, it makes wind fan blades severely damaged. The purpose of this paper is to use PLC and touch screen to realize quantitative content of sed- iment erosion wear in accurate control. The whole test system with highly precision and accurate control, it has practical value on the study of the fan blade abrasion.
Advances in PLC‐based irrigation canal automation
A short history of canal automation is given. PLC‐based canal automation is relatively new. Advances in PLC‐based canal automation are listed. Also listed are some of the remaining challenges. Recent advances have been made in understanding unsteady flow simulation procedures, the form of the control algorithms used, the tuning procedures for these control algorithms, and the field programming of the algorithms into PLCs. The experiences of the Cal Poly Irrigation Training and Research Center (ITRC) in automating a variety of canals with upstream and downstream control are given. Copyright © 2004 John Wiley & Sons, Ltd.