Here, we provide an overview of common substation busbar configurations—Single Bus, Main and Transfer, Double Breaker/Double Bus, Ring Bus/Ring Main, and Breaker and a Half. A busbar is a crucial component in electrical distribution systems, primarily serving as a conductor that collects and distributes electrical power. Here's a detailed overview of its characteristics, types, and applications. What controls it:. This step-by-step guide describes the basic concept of double pulse testing (DPT) and the necessary measurement setup and provides an overview of the parameters influencing the measurement.