Transient phenomena due to disconnect switching in high voltage substations

Field measurements in a high voltage switchyard during disconnector switching is presented. These measurements are compared with those obtained in a model circuit, set up in the authors´ high voltage laboratory. The need for electromagnetic compatibility in substation equipment, due to its electromagnetic interference is discussed. The level of overvoltage measured in the present work is discussed in the light of those available in the literature. The laboratory set up can model the switching transients measured in the switchyard. This gives us an opportunity to apply it as electromagnetic susceptibility test unit for substation equipment