In this paper the pollution resistance before the foot of the discharge, and the geometrical form of the leakage current lines, during the evolution of the discharge until flashover, is very important for the modelling of this phenomenon on a real insulator, and for the determination of its critical conditions. To study this problems, we have achieves a new model of laboratory. This model looks...

Substation protection is one of the most important schemes in power system. Rainfall, Humidity, Temperature and contaminations do not produce over voltage but are capable of lowering the flashover voltage and affect the operation of the equipment. The aim of the study was to identify the climatic factors especially the average lightning days and / or ground flash density so that substation desi...

According to the physical process of discharge development of insulator that is struck by lightning, the lightning flashover model for quadruple-circuit transmission line with dual voltage 220kV/110kV in same tower is established basing on EMTP. The actual evaluation index of lightning protection performance is adopted with the consideration of influence of system voltage. The characteristics o...

Abstract Characterising the risk of fire spread in informal settlements relies on ability to understand compartment fires with boundary conditions that are significantly different normal residential compartments. Informal settlement dwellings frequently have thermally thin and leaky boundaries. Due unique design these compartments, detailed experimental studies were conducted their dynamics. Th...

introduction the fire services play a key role in safety issues for any country. the operations of the services have a high visibility since the public is aware of its own vulnerability and possibly vital reliance on the service. firemen and women are rightly admired, particularly as their intervention may carry a risk to their own lives. more generally, this service comes at a considerable cos...