This book focuses on the interaction between switchgear and the high-voltage grid, specifically above 1 kV. The presentation emphasizes the processes that occur in the network in connection with switching operations under various conditions. The following topics are discussed in the book: short circuits in unearthed and earthed networks, short circuits on overhead lines, switching under asynchronous conditions (phase opposition), earth faults and double earth faults in unearthed networks, interruption of currents with no zero crossings, short-circuit current limitation, switching of air inductors, unloaded transformers, and fixed or starting motors, switching of capacitors and unloaded overhead lines, synthetic testing, and switching of isolating and earthing switches, load switches, and reclosers.