الفهرس | Only 14 pages are availabe for public view |
Abstract Fixed washing system is one of the most common techniques for cleaning high voltage insulators in generation power stations. This thesis presents an experimental study to investigate the effect of washing water flow rate as well as the equivalent salt deposit density (ESDD) on the leakage current passes over a high voltage insulator surface during the washing process. This investigation is carried out using a reduced experimental model that closely simulates the real washing system. Different washing water flow rates (1.5 liter/minute, 1 liter/minute, and 0.75 liter/minute) are used during the experiments. Leakage currents are measured and recorded at each washing flow rate. Each washing flow rate is studied at different ESDDs that cover light to very heavy pollution levels according to the IEC 60507 standard. These ESDDs are 0.03, 0.2, 0.4, and 0.6 mg/cm2. Also, leakage currents are recorded using a data acquisition system consists of a digital signal processing board (Dspace 1104) and a computer. Based on the obtained leakage current results, different washing methods are proposed to achieve an efficient washing system that reduces the chance of flashover occurrence. |