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.
Minitype Quasi-TEM Horn Antenna for Partial Discharge Detection in GIS
An outer-positioned small quasi-TEM horn antenna sensor was designed and constructed for detecting the partial discharge in gas insulation substations(GIS),which could expediently receive the electromagnetic wave leaked from the basin-type insulator,and effectively suppress low frequency electromagnetic interference from surroundings.Certain effective structures such as dielectric filled horn,wedge-shaped substrate and backing cavity were utilized to miniaturize during the antenna design process so as to optimize standing-wave ratio characteristics.The model calculation and experimental data measured in the laboratory shows that the antenna possesses a good radiating performance and a multi-band property when working in the ultrahigh frequency(UHF) band.The partial discharge was tested in the device of imitation GIS defect,detected by TEM horn antenna and existing microstrip patch antenna concurrently,then,the measurement results were compared.